Method of obtaining thermoplastic polymer based particles and powder obtained using said method

FIELD: chemistry.

SUBSTANCE: invention relates to a method of obtaining particles with a defined average diameter based on a thermoplastic polymer and powder. A molten mixture of thermoplastic material P with an additive A is prepared. The additive A contains a portion which is compatible with the thermoplastic material P and a portion which is incompatible with the thermoplastic material P and insoluble therein. The mixture is cooled and then treated with a compound B for layering. The compound B has a structure which is compatible with part of the structure of additive A. The weight ratio of components of the mixture is calculated using the formula: (weight of additive A + weight of compound B)/(weight of additive A + weight of compound B + weight of material P) and ranges from 0.01 to 0.6.

EFFECT: method enables to obtain particles with controlled geometry and given size.

34 cl, 3 tbl, 44 ex

 

The invention relates to a method for producing a powder consisting of particles based on a thermoplastic polymer. The method according to the invention contains, in particular, the stage of obtaining a mixture containing a thermoplastic polymer and two additives in the molten state, cooling the mixture and extracting the powder lamination. The invention also concerns a powder which can be obtained by the process according to the invention.

Thermoplastic polymers in powder form, in particular in the form of spherical particles with a diameter of typically less than 1 mm, preferably less than 100 μm are of interest for many applications. In fact, thermoplastic polymer powders, such as powders of polyamide, is used, in particular, as additives in paints, for example in paints for floors of gyms, which should have properties that prevent slipping. Powders of thermoplastic polymer is injected also in cosmetics, such as sunscreen, money for care body or face and means for removing makeup. Similarly, their use in the field of ink and paper.

Different ways of obtaining powders of thermoplastic polymer known to specialists in this field.

Powders of thermoplastic polymer can be obtained, for example, by crushing or klokoblinger Gran is l from a thermoplastic polymer with an average initial diameter of about 3 mm. However, the aforesaid mechanical transformation by reducing the size often lead to particles of irregular shape with a size rarely lower than 100 μm. The distribution of the above-mentioned particle size is often wide, and the resulting particles can hardly be used on an industrial scale.

Known also obtain powders of thermoplastic polymer by dissolving the polymer in a solvent and subsequent sedimentation. As the solvents, polymers, such as, for example, polyamide, are very volatile and cause severe corrosion, security conditions are strict, and this method cannot be carried out on an industrial scale. In addition, according to this method, it is difficult to control the shape of particles, which may be inconvenient for some applications.

There are other ways, according to which powders of thermoplastic polymer is producedin situduring the polymerization of the monomers of the polymer.

For example, known to produce polymer powders, such as polyamide, anionic polymerization of lactams in the solution. The polymerization is carried out in the presence of monomers, solvent, monomer, initiator, catalyst and activator under stirring at a temperature close to 110°C. This method is specific for polyamides derived from monomers of type LACT the MOU. He is not flexible enough and does not allow to diversify the nature of powders depending on the desired final properties of the powder, for example, by changing the nature of the monomers. Known also obtain powders of copolyamide anionic polymerization of lactams and lactones. These methods, based on the method of anionic polymerization are difficult to implement, in particular because of the high reactivity of anionic method.

Depending on the field of application of the powders to the desired particle size is changed. For example, in the field of paints and varnishes to the desired particle size varies from 0.1 to 10 μm; in the field of cosmetic powders have a particle size in the range from 5 to 10 μm; in the field of centrifugal molding the particle size varies from 300 to 500 μm. Thus, strive to obtain powders having a specific and predetermined particle size, and flexible ways to obtain a powder that increase the particle size of the powder.

One of the purposes of the invention is to develop a method of producing powder of a thermoplastic material consisting of particles of a certain size, which can be of small size and delicate correct form, with the advantages mentioned above.

To this end, the invention proposes a method of obtaining a powder of a thermoplastic material, SOS is Vashego of particles with a certain average diameter and less than 1 mm, includes the following stages:

a) preparing a molten mixture of the above-mentioned thermoplastic material P with at least one additive And obtaining a dispersion of discrete particles of thermoplastic material P, and the above-mentioned additive And formed of a polymeric material, the structure of which contains at least one part that is compatible with the above thermoplastic material P, and at least one part that is incompatible with the above thermoplastic material P and insoluble in it;

b) cooling the above mixture to a temperature below the softening temperature of thermoplastic material P;

C) processing the above cooled mixture to cause delamination of discrete particles of thermoplastic material P;

in order to obtain particles of the desired average diameter, at the stage of (a) introducing at least one connection that is incompatible with thermoplastic material P and insoluble in it.

According to one variant embodiment of the invention, the formation of the mixture reached by melting a thermoplastic material, adding additives and compounds In solid or molten form and application of the energy mix to achieve obtain discrete particles of thermoplastic material dispersed phase, preferably continuous, avnoj, formed by the additive and compound Century

This mixture in another method of carrying out the invention can be obtained by mixing the solid particles of the above thermoplastic material P, the particles of the above additives and particles of the above connections and melting of the mixture of particles with application to the molten mixture energy of mixing to achieve the formation of discrete particles of thermoplastic material P, dispersed phase, preferably, continuous, formed by the addition of a and compound Century

Additive a and the connection can be added simultaneously or sequentially. When additive a and the connection type series, additive And, preferably, add before connecting Century.

Determine the mass ratio of R1 and R2 as follows:

R1 represents a mass ratio (mass of the additive And + the mass of compound)/(weight of the additive And + weight compounds In + the mass of material P);

R2 represents a mass ratio (mass of compound)/(weight of the additive And + weight connections).

For this system material P/additive/connection for the selected particle size usually there is a linear relationship between R1 and R2. This linear relationship can be changed depending on the conditions of the mixing system P/additive/compound Century

Thus, asunny choice relations relations R1 and R2 such that as defined above, in the method according to the invention allows, in particular, to obtain powders of an average particle diameter. The method according to the invention allows to subdue the particle size of the powder. It gives the possibility of obtaining powders, the particle size of which is selected and set. The method is flexible, the particle size of the powder can be selected in a wide range of values extending, in particular, from 0.1 to 800 microns.

Preferably, the additive And the connection and thermoplastic material P introduced in stage a) in a mass ratio R1 (additive A + connection)/(additive A + connection + material P), which is in the range from 0.01 to 0.6, preferably from 0.01 to 0.5.

According to another characteristic of the invention, the mass concentration of the additive in the mixture preferably ranges from 1% to 50%, preferably from 3 to 30%.

According to another characteristic of the invention, the mass concentration of the additive in the mixture preferably ranges from 1% to 50%, preferably from 3 to 30%.

Generally, the mixture can be obtained using any suitable devices, such as mixers with an endless screw or agitator that is compatible with the conditions of temperature and pressure used in the application of thermoplastic materials.

According to a preferred method of carrying out the invention, fused with the offer at the stage of cooling of the mold, for example, in the form of fibers or rods. Specified molding can be preferably carried out by way of extrusion through the die plate.

According to a preferred method of carrying out the invention, in particular, when the molten mixture is subjected to molding, this molten mixture is preferably produced in the extruder, feeding the die plate for extruding.

Cooling the molten mixture can be carried out in any suitable way. Among them, air cooling or liquid immersion are preferred.

Stage extract powder of thermoplastic material is, preferably, in the processing of discrete particles of thermoplastic material for their separation. Specified delamination can be achieved by application to the cooled mixture shear stress.

Under the delamination mean the action which consists in the separation of the discrete particles of thermoplastic material from other elements of the mixture.

According to another method embodiment of the invention, separation of the particles of thermoplastic material reaches the immersion cooled molten mixture in the liquid non-solvent for thermoplastic material and, preferably, a solvent additive and compound Century

The method according to the invention allows produces the ü powders on the basis of any thermoplastic material.

As an example, thermoplastic polymer can be called polyamides, polyesters, polyurethanes, polyolefins, such as polyethylene or polypropylene, polystyrene, etc.

Under the private form of the method according to the invention, the preferred thermoplastic polymers are polyamides.

Any polyamide, well-known specialists in this field can be used within the scope of the invention. Polyamide is usually a polyamide such as those obtained by polycondensation based on dibasic carboxylic acids and diamines, or the type of those obtained by polycondensation of lactams and/or amino acids. The polyamide according to the invention may be a mixture of polyamides of different types and/or of the same type and/or copolymers derived from different monomers, corresponding to the same type and/or different types of polyamides.

As examples of polyamide, which can correspond to the invention include polyamide 6, polyamide 6,6, polyamide 11, polyamide 12, polyamide 4,6; 6,10; 6,12; 12,12; 6,36; polyaromatics polyamides, for example, polyphthalamide, derived from terephthalic and/or isophthalic acid, such as polyamide, supplied to the market under the trade name AMODEL, their copolymers and mixtures.

According to predpochtitelnye embodiment of the invention, polyamide choose among polyamide 6, polyamide 6,6, their mixtures and copolymers.

According to the private method of the invention, thermoplastic polymer is a polymer containing a star macromolecular chains. Polymers containing such a star macromolecular chains are described, for example, in documents FR 2743077, FR 2779730, US 5959069, EP 0632703, EP 0682057 and EP 0832149. These compounds are known that have improved flowability compared with linear polyamides of the same molecular weight.

According to another private method of the invention, thermoplastic polymer is a polycondensation product consisting of:

- 30-100% molar (including the boundary values) of the macromolecular chains, corresponding to the following formula (I):

R3-(X-R2-Y)n-X-A-R1-A-X-(Y-R2-X)m-R3(I)

- 0-70% molar (including the boundary values) of the macromolecular chains, corresponding to the following formula (II):

R4[Y-R2-X]p-R3(II)

in which

-X-Y - represents a radical resulting from polycondensation reactive functional groups (F 1and F2such that:

- F1is a precursor of the radical-X - and F2is a precursor of the radical-Y-, or Vice versa,

functional group (F1no can react by condensation

functional group (F2no can react by condensation

"And denotes a covalent bond or an aliphatic hydrocarbon radical, which may contain heteroatoms containing from 1 to 20 carbon atoms;

- R2denotes an aliphatic or aromatic hydrocarbon radical, branched or unbranched, containing from 2 to 20 carbon atoms;

- R3, R4denote hydrogen, a hydroxyl radical or a hydrocarbon radical;

- R1is a hydrocarbon radical containing at least 2 carbon atoms, linear or cyclic, aromatic or aliphatic, which may contain heteroatoms;

n, m and p represent each number, in the range from 50 to 500, preferably from 100 to 400.

This polycondensate described in the application WO 05/019510 included in the composition of the invention via a link. Preferably, polycondensate is a polyamide consisting of

- 30-100% molar (including the boundary values) of the macromolecular chains, corresponding to the following formula (I):

R3-(X-R2-Y)n-X-A-R1-A-X-(Y-R2-X)m-R3(I)

- 0-70% molar (including the boundary values) of the macromolecular chains, corresponding to the following formula (II):

R4[Y-R2-X]p-R3(II)

in which

- Y represents the radicalwhen X represents a radical,

- Y represents the radicalwhen X represents a radical;

"And denotes a covalent bond or an aliphatic hydrocarbon radical, which may contain heteroatoms containing from 1 to 20 carbon atoms;

- R2denotes an aliphatic or aromatic hydrocarbon radical, branched or unbranched, containing from 2 to 20 carbon atoms;

- R3, R4denote hydrogen, a hydroxyl radical or a hydrocarbon radical containing the groupor;

- R5denotes hydrogen or a hydrocarbon radical containing from 1 to 6 carbon atoms;

- R1is a hydrocarbon radical containing at least 2 atom is of Pereda, linear or cyclic, aromatic or aliphatic, which may contain heteroatoms;

n, m and p represent each number, in the range from 50 to 500, preferably from 100 to 400.

Thermoplastic polymers used in the invention may contain various additives, such as matting additives, heat stabilizers, light stabilizers, pigments, dyes, fillers, in particular, abrasive fillers. As an example, in particular, called the titanium oxide, zinc oxide, cerium oxide, silicon dioxide or zinc sulfide, used as matting additives and/or abrasive material.

In the method according to the invention can be used one or more additives A.

According to another characteristic of the invention, the additive And represents, preferably, a polymer type blakolmer, blockcopolymer, comb-shaped, hyperbranched, or star-shaped polymer. Thus, the structure that is compatible with thermoplastic material, is a unit segment, the skeleton or the teeth of the comb, the core or the rays of a star or hyperbranched polymer.

According to a preferred method of carrying out the invention, the compliant structure of the additive And contains functional groups which are chemically identical functional groups thermopla the quadratic polymer R.

According to a preferred method of carrying out the invention, additives And is chosen from the group formed by polymer D, defined below, or hyperbranched polymer E, containing at least one block of polyalkylated.

The above polymer D is a polymer with thermoplastic properties, containing a block of thermoplastic polymer and at least one block of polyalkylene, such that:

• the block of thermoplastic polymer contains star-shaped or H-shaped macromolecular chain containing at least one polyfunctional core and at least one beam or segment of thermoplastic polymer connected to the core, and the core contains at least three identical functional groups;

• the block or blocks of polyalkylated associated with at least part of the free ends of the star-shaped or H-shaped macromolecular chain, selected from among all rays or segments of thermoplastic polymer and a polyfunctional core.

Such thermoplastic polymers and method of production thereof are described in particular in document WO 03/002668.

Star macromolecular chain of the polymer D is, preferably, a star polyamide obtained by copolymerization, on the basis of a mixture of monomers containing

a) a polyfunctional with the unity, containing at least three identical reactive group selected from among amino group and carboxyl group;

b) monomers of the following General formulas (IIa) and/or (IIb):

c) in certain cases, the monomers of the following General formula (III):

Z-R2-Z(III)

in which

• Z represents a functional group that is identical reactive functional groups of the polyfunctional compounds;

• R1, R2represent aliphatic, cycloaliphatic or aromatic hydrocarbon radicals, substituted or unsubstituted, identical or different, containing from 2 to 20 carbon atoms, which may contain heteroatoms;

• Y is a primary amino group, when X denotes a carboxyl group, or

• Y is a carboxyl group when X represents a primary amino group.

H-shaped macromolecular chain of the block of thermoplastic polymer polymer D preferably represents N-polyamide obtained by copolymerization, on the basis of a mixture of monomers containing

a) a polyfunctional compound containing at least three identical reactive functional is e group, selected among amino group and carboxyl group,

b) a lactam and/or amino acids,

c) defunctionalize a compound selected among the dicarboxylic acids or diamines,

d) a monofunctional compound, the functional group which is either an amino group or carboxyl group,

when the functional group (C) and (d) are amino groups, when the functional group (a) represents a carboxyl group; a functional group (C) and (d) are carboxyl groups, when the functional group (a) represent the amino group; the ratio of the number of equivalents of functional groups (a) and the amount of functional groups (C) and (d) is in the range from 1.5 to 0.66; the ratio of the number of equivalents of functional groups) and functional groups (d) is in the range from 0.17 to 1.5.

Preferably, the polyfunctional compound with a star-shaped or H-shaped macromolecular chains represented by the formula (IV):

R1-[-A-z]m(IV)

in which

• R1is a hydrocarbon radical containing at least 2 carbon atoms, linear or cyclic, aromatic or aliphatic, which may contain heteroatoms;

• A pre who is a covalent bond or an aliphatic hydrocarbon radical, containing from 1 to 6 carbon atoms,

• Z represents a primary amino group or a radical of carboxylic acid,

• m is an integer in the range from 3 to 8.

Preferably, the polyfunctional compound is chosen among the 2,2,6,6-Tetra(β-carboxyethyl)cyclohexanone, criminology acid, 2,4,6-three(aminocaproic acid)-1,3,5-triazine, 4-amino-ethyl-1,8-octanediamine.

Polyalkyloxy (PJSC) (ROA) block polymer D preferably is linear. It can be selected among polietilenoksidnoy, polytrimethylene and polytetramethylene blocks. When the block is a block-based polyethylene oxide, it may be at the ends of the block parts of propylene glycol. Preferably, polyalkyloxy block polymer D is a polietilenoksidnoy block.

Preferably, all the loose ends of the macromolecular chain of the block of thermoplastic polymer polymer D are associated with polyalkylbenzenes block.

Under hyperbranched polymer E according to the invention mean a branched polymer structure obtained by polymerization in the presence of compounds having a functionality of more than 2, the structure of which is not fully controlled. Often these hyperbranched polymers are random copolymers. SVER is branched polymers can be obtained, for example, by reaction, in particular, between the multi-functional monomers, for example, trifunctional and bifunctional, with each monomer carries at least two different polymerizable functional group.

Preferably, the hyperbranched polymer E according to the invention is chosen among hyperbranched polyesters, polyetherimides and polyamides.

Preferably, the hyperbranched polymer E according to the invention is a hyperbranched copolyamide type copolyamids obtained by the reaction between the

- at least one monomer of the following formula (I):

A-R-Bf(I),

in whichAndrepresents a reactive polymerizable functional group of the first type,Inrepresents a reactive polymerizable functional group of the second type, capable of reacting withAnd, R represents a hydrocarbon particle and f represents the total number of reactive functional groupsInthe monomer: f ≥ 2, preferably 2 ≤ f ≤ 10;

- at least one monomer of the following formula (II):

A'-R'-B'(II),

in whichA', B', R'have the same meaning that is given above, respectively, forA, B, Rin the formula (I),

or the corresponding lactams,

- at least one monomer of the "core" of the following formula (III):

R1(B)n(III)

in which

- R1denotes a hydrocarbon radical, substituted or unsubstituted, type silicone, linear or branched alkyl, aromatic, alkylaryl, arylalkyl or cycloaliphatic, who may be composed of bonds and/or heteroatoms;

-B"denotes a reactive functional group of the same nature thatInorIn';

n ≥ 1, preferably, 1 ≤ n ≤ 100;

or at least one monomer "limiter circuit" following formula (IV):

R2-A"(IV)

in which

- R2denotes a hydrocarbon radical, substituted or unsubstituted, type silicone, linear or branched alkyl, aromatic, alkylaryl, arylalkyl or cycle is aliphatic, which may contain one or more unsaturated bonds and/or one or more heteroatoms;

andAnd"denotes a reactive functional group of the same nature thatAndorAnd',

thus

the molar ratio ofI/IIis defined as follows:

of 0.05<I/II

and, preferably,

0,125≤aI/II≤2;

at least one of the particles,RorR'at least one of the monomers (IorII) is an aliphatic, cycloaliphatic or arylaliphatic;

R1and/or R2are polyoxyalkylene radicals.

Such copolyamids described in document WO 00/68298 A1, in particular, on page 11, lines 3 through 6.

Reactive polymerizable groupA, b, a','selected, preferably in the group comprising carboxyl groups and amino groups.

The monomer of formula (I) hyperbranched polyamide, preferably, is a compound in whichAndrepresents an amino group,In- carboxyl group, R is an aromatic radical, and f=2.

Group R1and/or R2represent, preferably, aminirovanie polyoxyalkylene radicals, type Jeffamine®.

The connection method according to the invention is insoluble and incompatible with thermoplastic material is. Preferably, the compound has a chemical structure that is compatible with at least part of the structure of the additive And, in particular, with part of the structure And incompatible with the connection R. Preferably, the connection is a Homo-polymer incompatible part of the additive A. as examples of compounds suitable for the invention include compounds belonging to the family of polysaccharides, polyoxyethyleneglycol, polyolefin, silicon-containing compounds, waxes, etc. Connection can be added separately from supplements or in the form of a mixture with at least part of the additive A. the method according to the invention can be used one or more compounds Century

Similarly, the connection can be pre-mixed with the material R.

To prepare the mixture according to the invention can be used with any method of preparation of the mixture, well-known experts in this field. For example, it is possible to obtain a homogeneous mixture of pellets of thermoplastic polymer P, additives and compounds, or a mixture of pellets of thermoplastic polymer P, pellet additive a and additive granules C. similarly, thermoplastic polymer P may be in the form of pellets that are coated with additive and/or connection of a Century Additive a and the connection can be introduced into the polymer P during the polymerase is Itachi, preferably, at the end of the polymerization. Similarly, the additive a and the connection can be introduced into the polymer in the molten state.

Stage a) consists in obtaining the mixture in the molten state under stirring.

This stage is preferably carried out in any mixer, compatible with the conditions of temperature and pressure, used with thermoplastic materials. Stage a) is carried out, preferably in an extruder, more preferably, a twin screw or mnogovekovom the extruder.

The mixture can be obtained according to the method described above, and then introduced into the device for the extrusion used in stage a). The mixture can be introduced in solid or liquid form, for example, in the molten state.

Similarly, the mixture can be obtainedin situin the same device for the extrusion, as the device that is used in stage a).

Mixing on stage and allows you to shift the composition and effective mixing of thermoplastic material, additives and compounds Century Applied energy shift is determined depending on the nature of the mix of products and the desired size of the particles of thermoplastic material.

The mixture, before being cooled according to stage b)can be extruded through the die plate to give it the shape ol the TKA, thread the film the usual and well-known specialists in this field by the way.

Stage b) is cooled mixture to cure at least a thermoplastic material. This curing can be carried out in the usual way by means of air or water.

Phase separation of particles of thermoplastic polymer, based on the chilled mixture, can be carried out in various ways.

So, the first way is to Annex the mechanical force, such as friction, shear, torsion, required to cause the above-mentioned delamination.

In another method of implementation of the delamination occurs instantly when the cooled mixture is injected into a liquid, such as, for example, water.

In still one other way of the fluid preferably is a solvent additives and compounds C. Thus, it is possible to devote a larger portion of the additive and connections In, for example, to be able to use them again. In addition, the powder of thermoplastic polymer will contain fewer impurities, additives and compounds Century

In other cases, it may be interesting not to remove additive And that will remain to be present on the surface of the particles of thermoplastic material, thus modifying the surface properties is as mentioned particles.

Preferably, stage (b) and (C) carry out at the same time. For example, you can enter the mixture after extrusion through the die plate directly into the reactor containing solvent additives and compounds In a non-solvent for the polymer P.

If necessary, the particles of the polymer P are separated from the solution, the solvent/additive/compound Century, the Selection can be carried out in any way be separated from the liquid phase of the suspension of the solid phase. The selection may include, for example, filtration, decantation, centrifugation, spray.

When it comes to, for example, aqueous dispersions, the selection may be made, for example, by sputtering to remove powder containing elementary particles, the size of which is equivalent to the size of the particles in the dispersion, and/or aggregates of particles. These units can usually be easily re-dispersed in an aqueous medium such as water, or crushed into powder using vibration. Can be used other ways to remove water or highlighting powder, such as filtration or centrifugation, and then drying the precipitate on the filter.

Particles of the polymer P, thus obtained, can be washed and dried.

The method according to the invention gives the possibility of obtaining particles of controlled geometry, frequent in the spine, by adjusting the mixing stage a), the nature of the compounds a and/or b, the temperature and concentration of the various components of the mixture.

One of the objectives of the invention are powders of thermoplastic materials, which can be obtained by the process according to the invention.

Preferably, the particles obtained by the method according to the invention are spherical particles.

Under spherical particle mean particle essentially spherical shape.

Preferably, the desired average particle diameter according to the method of the invention is preferably in the range of from 0.1 to 800 μm. The desired diameter varies depending on applications of powders. The particle size of the powders according to the invention is given, the distribution of particle sizes is odnodolnym.

Under a mean diameter mean value corresponding to the modal peak odnomodovogo distribution of particles by size.

The distribution of particle size is usually determined by laser granulometry, well-known experts in this field.

Similarly, particles can be in the form of a regular or irregular polyhedron. The particles forming the powder of a thermoplastic material, typically have a pore volume equal to or close to 0 cm3/g, since the particles do not have any then what stotu.

Other details or advantages of the invention will appear more clearly when reading the following examples, with reference to the accompanying drawing, which is a photograph of the resulting dispersion.

EXAMPLES

The materials used in the examples are as follows.

The polymer P: polyamide 66 with a relative viscosity of 2.6

Additive And: star hydrophilic copolymer polyamide-polyalkylene obtained as follows.

In the autoclave with a volume of 7.5 liters, equipped with a mechanical stirrer, were introduced: 1116,0 g of ε-caprolactam (9,86 mol), and 57.6 g of 1,3,5-benzotriazoles acid (0.27 mol), 1826,4 g Jeffamine ® M2070 (0.82 mol), 1.9 grams ULTRANOX® 236 and 3.5 g of a 50%aqueous solution (weight/weight) phosphonoacetic acid.

The reaction mixture was brought up to 250°C in nitrogen atmosphere at atmospheric pressure and held at the specified temperature for 1 hour. Then the system was gradually evacuated for 30 minutes until a pressure of 5 mbar, and then kept under vacuum for an additional hour. Then the system was poured on the plate.

Connection:

Connection B1: polyethylene oxide with a molecular weight of 400 g/mol,

Compound B2: polyethylene oxide with a molecular mass of 1500 g/mol,

Compound B3: polyethylene oxide with a molecular weight of 12,000 g/mol.

In co-rotating twin screw extruder 24D type Prism by about the roadways to feed introduced granules of polymer P and by bulk supply - the mixture tablets additives and compounds (B1, B2 or B3). The performance of the two dispensers are regulated in such a way as to be able to make to change the concentration of additives and compounds In a mixture with thermoplastic polymer P. the Mixture was extrudible with fixed flow rate in the range from 1.9 to 2.2 kg/hour. The temperature of various parts of the extruder ranged from 275 to 295°C. the Rate was fixed at 200 rpm Recorded pressure is in the range from 10 to 13 bar. The resulting rods at the die exit was washed by the flow of water, collected in a metal basket, gave water to drain, and then dried.

Collected rods then dispersible in water by simple mechanical stirring. Thus obtained dispersion was sieved through a 200 μm sieve to remove solid particles of a large size, such as redispersible pieces of rods. Mass outputs retrieve thermoplastic polymer P after the screening was over 90%. The particle size distribution of the particles contained in the dispersion was measured by using the apparatus of the brand MasterSizer 2000, included in the sale by the company Malvern instruments. The specified distribution, expressed as the volume obtained after the application of ultrasonic treatment is unimodal, and the value listed in the tables below, according to which tstuat the magnitude of the modal peak.

Different powders have been obtained and characterized according to the method described above.

Examples 1-15

In these examples used different concentrations of the additive A, and for each concentration of the additive And changed the concentration of compounds In order to obtain different sizes of the powder particles (see table 1, following).

Percentage below, expressed in % of the mass. in relation to the weight of the composition.

Examples 16-35

In these examples were obtained powders with variable particle sizes and for each size of the particles changed the concentration of additives and compounds In the composition (see table 2, following).

Percentage below, expressed in % of the mass. in relation to the weight of the composition.

The drawing corresponding to the examples 1-35, illustrates a linear relationship between mass relations R1 and R2 for a given particle size.

Examples 36-44

In these examples were obtained powders of compounds B1 and B3 (see table 3, following).

Percentage below, expressed in % of the mass. in relation to the weight of the composition.

Table 3
Example
No.
The polymer P
(%)
Additive And
(%)
Nature
compounds B2
Connection
(%)
Size
(µm)
36
(comparative)
750,0B125,0Rod
redispersion
37of 87.011,0B12,00.95 microns
3880.0of 17.5B12,51.5 mm
3980,012,5B17,53,3 µm
40
(comparative)
890B311,0Rod
redispersion
4188,59,2 2,31.1 µm
42
(comparative)
79,00,0B321,0Rod
redispersion
4380,08,0B3to 12.01.7 mm
4480,016,0B34,01.4 µm

1. A method of obtaining a powder of a thermoplastic material P, consisting of particles with a certain average diameter and less than 1 mm, containing the following stages:
A. preparing a molten mixture of the above thermoplastic material P with at least one additive And obtaining a dispersion of discrete particles of thermoplastic material P, and the above-mentioned additive And formed of a polymeric material, the structure of which contains at least one part that is compatible with the above-mentioned thermoplastic material P, and at least one part that is incompatible with the above-mentioned thermoplastic material P and insoluble in n the m to obtain a dispersion of discrete particles of material,
b. cooling the above mixture to a temperature below the softening temperature of thermoplastic material P;
C. processing the above cooled mixture to cause delamination of discrete particles of thermoplastic material P;
characterized in that, in order to obtain particles of the desired average diameter at the stage of (a) introducing at least one connection that is incompatible with thermoplastic material P and insoluble in it, and when this connection has a structure that is compatible with at least part of the structure of the additive A;
and the fact that the mass ratio R1 (mass supplements And + the mass of compound)/(weight of the additive And + weight compounds In + the mass of material P) is in the range from 0.01 to 0.6.

2. The method according to claim 1, characterized in that the formation of the mixture reaches the melting of thermoplastic material P and the addition of additives and compounds In solid or molten form and application of the energy mix to achieve obtain discrete particles of thermoplastic material.

3. The method according to claim 1, characterized in that the formation of the mixture reaches the mixing of solid particles above a thermoplastic material P, the particles of the above additives and particles of the above connections and melting of the mixture of particles with Mgr is available to the molten mixture energy of mixing, in order to achieve the formation of discrete particles of thermoplastic material.

4. The method according to one of claims 1 to 3, characterized in that the mass concentration of the additive in the mixture is in the range from 1 to 50%.

5. The method according to one of claims 1 to 3, characterized in that the mass concentration of the compounds In the mixture is in the range from 1 to 50%.

6. The method according to one of claims 1 to 3, characterized in that the molten mixture is formed at the stage of cooling.

7. The method according to claim 6, characterized in that the method of molding is a method of extrusion through the die plate.

8. The method according to claim 7, characterized in that the molten mixture is produced in the extruder, feeding the die plate for extruding.

9. The method according to one of claims 1 to 3, characterized in that the cooling is an air cooling.

10. The method according to one of claims 1 to 3, characterized in that the cooling is achieved by immersion in liquid.

11. The method according to one of claims 1 to 3, characterized in that the treatment of the particles of thermoplastic material P to their stratification is achieved by application of shearing forces to the cooled mixture.

12. The method according to one of claims 1 to 3, characterized in that the treatment of the particles of thermoplastic material P to their stratification is achieved by immersing the cooled molten mixture in the liquid non-solvent for thermoplastic mother is La R.

13. The method according to item 12, wherein the liquid is a solvent additives and compounds Century

14. The method according to one of claims 1 to 3, characterized in that thermoplastic polymer is a polyamide or a complex polyester.

15. The method according to 14, characterized in that thermoplastic polymer is a polyamide selected from the group consisting of polyamide 6, polyamide 6,6, polyamide 11, polyamide 12, polyamide 4,6; 6,10; 6,12; 12,12; 6,36, their copolymers and mixtures.

16. The method according to one of claims 1 to 3, characterized in that thermoplastic polymer contains an additive selected from the group comprising matting additives, thermal stabilizers and/or light stabilizers, pigments, dyes, fillers, in particular abrasive fillers.

17. The method according to one of claims 1 to 3, characterized in that the additive And is a polymer type blakolmer, blockcopolymer comb-shaped, hyperbranched, star.

18. The method according to 17, characterized in that the structure that is compatible with thermoplastic material is blakolmer block type, segment blockcopolymer, the teeth of a comb-like polymer, the core or the rays of a star or hyperbranched polymer.

19. The method according to one of claims 1 to 3, characterized in that the compatible structure of the additive And contains functional groups, identity is passed to the functional groups of thermoplastic polymer.

20. The method according to one of claims 1 to 3, characterized in that the additive And represents the D block copolymers containing a block of thermoplastic polymer and at least one block of polyalkylene, such that:
the block of thermoplastic polymer contains star-shaped or H-shaped macromolecular chain containing at least one polyfunctional core and at least one beam or segment of thermoplastic polymer connected to the core, and the core contains at least three identical reactive functional group;
the block or blocks of polyalkylated associated with at least part of the free ends of the star-shaped or H-shaped macromolecular chain, selected from among all rays or segments of thermoplastic polymer and a polyfunctional core.

21. The method according to claim 20, characterized in that the star-shaped macromolecular chain of the block of thermoplastic polymer D is a star polyamide obtained by copolymerization, on the basis of a mixture of monomers containing
a) a polyfunctional compound containing at least three identical reactive group selected from among amino group and carboxyl group;
b) monomers of the following General formulas (IIa) and/or (IIb):

c) in certain cases mo is the Windows following General formula (III):

in which Z represents a functional group that is identical reactive functional groups of the polyfunctional compounds;
R1, R2represent aliphatic, cycloaliphatic or aromatic hydrocarbon radicals, substituted or unsubstituted, identical or different, containing from 2 to 20 carbon atoms, which may contain heteroatoms;
Y represents a primary amino group, when X denotes a carboxyl group, or
Y represents a carboxyl group when X represents a primary amino group.

22. The method according to claim 20, characterized in that the N-shaped macromolecular chain of the block of thermoplastic polymer D is an N-polyamide obtained by copolymerization, on the basis of a mixture of monomers containing
a) a polyfunctional compound containing at least three identical reactive functional groups, selected from among the amino and carboxyl groups,
b) a lactam and/or amino acids,
c) defunctionalize a compound selected among the dicarboxylic acids or diamines,
d) a monofunctional compound, the functional group which is either an amino group or carboxyl group,
when the functional group (C) and (d) are amino groups, when the function is national group) represent a carboxyl group; the functional groups of C) and d) are carboxyl groups, when the functional group (a) represent the amino group; the ratio of the number of equivalents of functional groups (a) and the amount of functional groups (C) and (d) is in the range from 1.5 to 0.66; the ratio of the number of equivalents of functional groups) and functional groups (d) is in the range from 0.17 to 1.5.

23. The method according to claim 20, characterized in that the polyfunctional compound represented by formula (IV):

in which R1is a hydrocarbon radical containing at least 2 carbon atoms, linear or cyclic, aromatic or aliphatic, which may contain heteroatoms;
Rather it represents a covalent bond or an aliphatic hydrocarbon radical containing from 1 to 6 carbon atoms,
Z represents a primary amino group or a radical of carboxylic acid,
m is an integer in the range from 3 to 8.

24. The method according to claim 20, characterized in that the polyfunctional compound selected among the 2,2,6,6-Tetra(β-carboxyethyl)cyclohexanone, criminology acid, 2,4,6-three(aminocaproic acid)-1,3,5-triazine, 4-amino-ethyl-1,8-octanediamine.

25. The method according to claim 20, characterized in that polyalkyloxy block polymer D is linear.

26. The method according A.25, characterized in that alkilinity block polymer D is a polietilenoksidnoy block.

27. The method according to claim 20, characterized in that the free ends of the macromolecular chain of the block of thermoplastic polymer D are associated with polyalkylbenzenes block.

28. The method according to p, characterized in that the hyperbranched polymer E is selected from among polyesters, polyetherimides and polyamides.

29. The method according to p or 28, characterized in that the hyperbranched polymer E is a hyperbranched copolyamide type copolyamids obtained by reaction between
- at least one monomer of the following formula (I):

in which a represents a reactive polymerizable functional group of the first type, is a reactive polymerizable functional group of the second type, capable of reacting with A, R is a hydrocarbon particle, and f represents the total number of reactive functional groups In the monomer: f≥2, preferably 2≤f≤10;
- at least one monomer of the following formula (II):

in which A',' R' have the same meaning that is given above, respectively for a, b, R in the formula (I),
or the corresponding lactams,
- at least one monomer of the "core" of the following formula (III):

in which R1indicates uglevodorodnyi radical, substituted or unsubstituted type of silicone, linear or branched alkyl, aromatic, alkylaryl, arylalkyl or cycloaliphatic, who may be composed of bonds and/or heteroatoms;
In" denotes a reactive functional group of the same nature that or';
n≥1, preferably 1≤n≤100;
or at least one monomer "limiter chain of the following formula (IV):

in which R2denotes a hydrocarbon radical, substituted or unsubstituted type of silicone, linear or branched alkyl, aromatic, alkylaryl, arylalkyl or cycloaliphatic, which may contain one or more unsaturated bonds and/or one or more heteroatoms;
and A" denotes a reactive functional group of the same nature as a or a',
when this molar ratio I/II is defined as follows:
of 0.05<I/II and preferably
0,125≤I/II≤2;
at least one of the particles is R or R' is at least one of the monomers (I) or (II) is an aliphatic, cycloaliphatic or arylaliphatic;
R1and/or R2are polyoxyalkylene radicals.

30. The method according to clause 29, wherein the reactive polymerizable group is s And, B, a', A' is selected from the group comprising carboxyl groups and amino groups.

31. The method according to clause 29, wherein the monomer of formula (I) is a compound in which a represents an amino group, a carboxyl group, R is an aromatic radical and f=2.

32. The method according to claim 1, characterized in that the compound selected among the compounds belonging to the family of polysaccharides, polyoxyethyleneglycol, polyolefin, silicon-containing compounds.

33. The method according to claims 1 to 3, characterized in that the desired average particle diameter is in the range from 0.1 to 800 microns.

34. The powder of thermoplastic material P, which can be obtained according to the method according to one of claims 1 to 33.



 

Same patents:

FIELD: chemistry.

SUBSTANCE: composition contains a mixture of polyamide, where the ratio of terminal amino groups in the terminal carboxyl groups of the polyamide polymer is less than 0.2, polyester which is capable of crystallising and an interfacial tension reducing agent.

EFFECT: composition enables to obtain dispersed particles with average size of less than 200 nm when stretched, good colour composition which will not exhibit high increase in turbidity with increase in the amount of dispersed material, or has acceptable turbidity during production, and has good colour, especially in the absence of cobalt.

7 cl, 3 tbl, 18 ex, 8 dwg

FIELD: chemistry.

SUBSTANCE: composition contains a mixture of polyamide, where the ratio of terminal amino groups in the terminal carboxyl groups of the polyamide polymer is less than 0.2, polyester which is capable of crystallising and an interfacial tension reducing agent.

EFFECT: composition enables to obtain dispersed particles with average size of less than 200 nm when stretched, good colour composition which will not exhibit high increase in turbidity with increase in the amount of dispersed material, or has acceptable turbidity during production, and has good colour, especially in the absence of cobalt.

7 cl, 3 tbl, 18 ex, 8 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to a polyamide resin composition containing polyamide (x), having a diamine link which mainly consists of an m-xylene diamine link, and a dicarboxylic acid link which mainly consists of an adipic link; and specific quantities of phosphoric acid antioxidants and an alkaline component. Polyamide (x) is characterised by a specific range of concentration balance of terminal groups and specific rate of reaction of amine groups.

EFFECT: use of said composition may simultaneously prevent yellowing and reduce the number of gels and fish eyes in articles made from said composition.

7 cl, 5 tbl, 12 ex

FIELD: chemistry.

SUBSTANCE: in polyamide composite material consisting of a matrix of 6-block polyamide and a modifying additive, the carbon additive used is thermally expanded graphite, thermally expanded graphite simultaneously with fullerene C60 or fullerene C70, or mixture thereof or the carbon additive used is thermally expanded graphite simultaneously with fullerene C60 or fullerene C70, or mixture thereof and fullerene-containing soot containing fullerenes C60 and C70, or mixture thereof. If a composite filler, which contains fullerenes and thermally expanded graphite, is used, specific resistance of the material can be lowered to the required level by 106-1011 Ω·cm while preserving strength properties.

EFFECT: improved composition properties.

3 cl, 2 tbl, 39 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a polyester polymer composition, preparation method thereof, as well as an article moulded from said composition, such as a film, a sheet and a thin-wall hollow container. The polymer composition contains 2-30 wt % polyamide resin (A) 69.5-97.99 wt % polyester resin (B) and 0.01-0.5 wt % polycarboxylic acid (C). The method of preparing the polymer composition involves preparation of a preliminary composition through mixture in molten state of components (A), (B) and (C) or components (A) and (C) with subsequent mixture of the preliminary composition and the polyester resin (B) in molten state. The moulded article is made by moulding the polymer composition.

EFFECT: composition is weakly-coloured and has excellent gas-barrier properties, transparency and mechanical properties of the finished product.

13 cl, 14 tbl, 34 ex

Multilayer bottle // 2415015

FIELD: process engineering.

SUBSTANCE: invention relates to multilayer bottle intended for beer, tea, juices or carbonated drinks. Proposed bottle comprises inner and outer layers, each made from polyether (A), and, at least, one barrier layer arranged there between. Polyether (A) is thermoplastic resin produced by polymerisation of dicarboxylic acid containing 80 gram-mol or more of terephthalic acid with diol component containing 80 gram-mol or more of ethylene glycol. Barrier layer contains the mix of polyamide (B) and polyamide (C). Polyamide (B) is produced by polycondensation of diamine component containing 70% gram-mol or more of m-xylylenediamine with dicarboxylic acid containing 70 gram-mol or more of α,ω-linear aliphatic dibasic acid with C4-C20. Polyamide (C) consists of poly(6-aminocaproic acid) and/or poly(hexamethylene diamine of adipinic acid), and amorphous semi-aromatic - copolymer of hexamethylene isophthalamide/hexametgyleneamide of terephthalic acid.

EFFECT: stronger interlayer adhesion, higher resistance to lamination, good gas tightness.

12 cl, 2 tbl, 8 ex

FIELD: machine building.

SUBSTANCE: procedure consists in condensing polyamide moulding blend, polyamide of which has at least 30 % of end groups in form of end amino-groups of polycarbonate with 0.005 to 10 wt % in terms of used polyamide. At stage a) there is prepared polyamide moulding blend, b) there is produced mixture of polyamide moulding blend and polycarbonate, c) if necessary, blend is stored and/or transported by point b) and d) mixture is processed by point b) into a moulded item. The item corresponds to a hollow item or hollow profile with external diametre at least 30 mm and thickness of wall at least 1 mm. Condensing occurs only at stage of processing.

EFFECT: increased stiffness of melt at simultaneous reduced pressure during processing and insignificant load on engine, simplification of moulded items production.

6 cl, 1 ex, 2 tbl

FIELD: machine building.

SUBSTANCE: procedure consists in condensing polyamide moulding blend, polyamide of which has at least 30 % of end groups in form of end amino-groups of polycarbonate with 0.005 to 10 wt % in terms of used polyamide. At stage a) there is prepared polyamide moulding blend, b) there is produced mixture of polyamide moulding blend and polycarbonate, c) if necessary, blend is stored and/or transported by point b) and d) mixture is processed by point b) into a moulded item. The item corresponds to a hollow item or hollow profile with external diametre at least 30 mm and thickness of wall at least 1 mm. Condensing occurs only at stage of processing.

EFFECT: increased stiffness of melt at simultaneous reduced pressure during processing and insignificant load on engine, simplification of moulded items production.

6 cl, 1 ex, 2 tbl

Multilayer bottle // 2411129

FIELD: process engineering.

SUBSTANCE: invention relates to multilayer bottle intended for tea, juices or carbonated drinks. Proposed bottle comprises outer layer, inner layer and barrier layer arranged there between. Outer and inner layer are made from polyether (A) produced y polymerisation of dicarboxylic acid component that contains 80 mol %, or more, of terephthalic acid with diol component containing 80 mol %, or more, of ethylene glycol. Barrier layer comprises polyamide (B) produced by polycondensation of 70 mol %, or more, of meta-xylylenediamine with 70 mol %, or more, or α,ω-collinear aliphatic dicarboxylic acid with 4-20 carbon atoms, and thermoplastic polymer (C).The latter is selected from the group consisting of phenoxy resin in the form of poly hydroxyl ester, polyglycol acid and polyamide oligomer with low molecular weight other than polyamide (B).

EFFECT: multiplayer bottle without delamination in flatwise fall.

8 cl, 3 tbl, 8 ex

FIELD: chemistry.

SUBSTANCE: composition contains the following (wt %): aliphatic polyamide (up to 100) and a modifying additive (15-45) - functionalised polymer or ethylene-polyethylene copolymer and(or) copolymer of ethylene with C3-8 α-olefin. The functionalised polymer or copolymer contains not less than two carboxylic (or derivatives thereof) groups in the composition of macromolecules. Their melt flow index at temperature for mixing with aliphatic polyamide is 5-50 times lower than the melt flow index of the latter.

EFFECT: invention enables to obtain polyamide compositions which are suitable for processing using extrusion technologies, having high strength and viscosity of the melt.

2 cl, 1 tbl, 26 ex

FIELD: chemistry.

SUBSTANCE: hardening composition is obtained by selecting (i) a chemically active carrier from polyesters, epoxides and alkoxylates which do not contain styrene, or (ii) a chemically inactive carrier from phthalate and benzoate plasticisers, and short-chain saturated polyesters. Further, a peroxide catalyst is selected from ketone peroxides, cumyl hydroperoxides, dibenzoyl peroxides, peroxy esters, perox yketals and peroxy dicarbonates. Thickened and volumising agent - microspheres are then added and the carrier, catalyst and microspheres are mixed. Using said thickened hardening composition, a two-component thermo-reactive polyester resin is obtained.

EFFECT: invention enables to obtain hardening compositions which, at room temperature, remain stable for more than one year.

20 cl, 10 tbl, 7 ex

FIELD: chemistry.

SUBSTANCE: composition contains a mixture of polyamide, where the ratio of terminal amino groups in the terminal carboxyl groups of the polyamide polymer is less than 0.2, polyester which is capable of crystallising and an interfacial tension reducing agent.

EFFECT: composition enables to obtain dispersed particles with average size of less than 200 nm when stretched, good colour composition which will not exhibit high increase in turbidity with increase in the amount of dispersed material, or has acceptable turbidity during production, and has good colour, especially in the absence of cobalt.

7 cl, 3 tbl, 18 ex, 8 dwg

FIELD: chemistry.

SUBSTANCE: method involves drawing an polyethylene terephthalate article in an adsorption-active liquid medium containing modifying additives, and drying the article in air until complete removal of the solvent. The modifying additive is a biocidal preparation or antipyrene. The polymer article with an extended shape used can be a fibre, a film, a tape, a tube or a rod.

EFFECT: invention simplifies the technology of making polyethylene terephthalate articles with good biocidal properties and low combustibility compared to existing articles.

20 cl, 2 dwg

FIELD: chemistry.

SUBSTANCE: material contains a polymer matrix - polyhydroxybutyrate and filler. The matrix also contains glycerine as a plasticiser and the filler is a surfactant-modified sheet silicate, with the following ratio of components in wt %: sheet silicate 1-5, glycerine 1.3-5 and polyhydroxybutyrate - the rest. Content of the plasticiser in the matrix is not over 5 wt %. The sheet silicate is Na+ - montmorillonite grade clay.

EFFECT: invention enables to obtain biodegradable material using a simple method with high modulus of elasticity, strength and deformability.

2 cl, 2 tbl, 9 ex

FIELD: chemistry.

SUBSTANCE: copolyether contains an acid component (A) and at least one diol component (B). The acid component consists of 1) 50-60 mol % aromatic polyfunctional acid and 2) 40-50 mol % aliphatic acid, where 90 mol % comprises a natural long-chain dicarboxylic acid selected from azelaic acid, sebacic acid, brassilic acid or mixtures thereof. The invention enables to obtain biodegradable polyether which has over 70% biodegradability after 90 days, density equal to or less than 1.2 g/cm3, average molecular weight 40000-140000, characteristic viscosity 0.8-1.5.

EFFECT: improved characteristics of polyethers.

23 cl, 4 tbl, 9 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a polyester polymer composition, preparation method thereof, as well as an article moulded from said composition, such as a film, a sheet and a thin-wall hollow container. The polymer composition contains 2-30 wt % polyamide resin (A) 69.5-97.99 wt % polyester resin (B) and 0.01-0.5 wt % polycarboxylic acid (C). The method of preparing the polymer composition involves preparation of a preliminary composition through mixture in molten state of components (A), (B) and (C) or components (A) and (C) with subsequent mixture of the preliminary composition and the polyester resin (B) in molten state. The moulded article is made by moulding the polymer composition.

EFFECT: composition is weakly-coloured and has excellent gas-barrier properties, transparency and mechanical properties of the finished product.

13 cl, 14 tbl, 34 ex

FIELD: chemistry.

SUBSTANCE: invention relates to compositions prepared from polyesters and polyamides for making articles such as sheets, films, fibres, bottles and articles made via pressure casting. The composition contains crystallisable polyester and polyamide dispersed in the polyester. The polyester consists of 85% acid fragments obtained from terephthalic acid, 2,6-naphthalene dicarboxylic acid and diesters thereof. The polyamide consists of a repeating link of aminocaproic acid and a repeating A-D link. A is a residue of adipic acid, isophthalic acid, terephthalic acid, 1,4-cyclohexane dicarboxylic acid or naphthalene dicarboxylic acid or mixtures thereof, and D is a residue of m-xylene diamine, p-xylene diamine, hexamethylene diamine, ethylene diamine or 1,4-cyclohexane dimethyl amine or mixtures thereof. The polyamide has triamine content after hydrolysis less than 0.22, and content of carboxyl outside the range of 20-80% of total amount of terminal groups.

EFFECT: invention enables to obtain partitioned. granules without increasing relative viscosity and without gel formation.

14 cl, 2 tbl, 4 dwg, 16 ex

FIELD: chemistry.

SUBSTANCE: wall has a layer which contains a polyamide dispersed in a crystallisable polyester and an agent which reduces interphase tension, selected from a group comprising lithium sulphoisophthlate and lithium sulphobenzoic acid. The polyamide contains a product of reacting aminocaproic acid with itself, or a product of reacting A-D, where A is a residue of adipinic, isophthalic, terephthalic, 1,4-cyclohexane dicarboxylic, resorcinol dicarboxylic or naphthalene dicarboxylic acid or mixtures thereof, and D is a residue of m-xylenediamine, n-xylenediamine, hexamethylenediamine, ethylenediamine or 1,4-cyclohexane dimethylamine or mixtures thereof. The polyester contains 85% links obtained from terephthalic acid or dimethyl ester of terephthalic acid. The wall does not contain cobalt compounds.

EFFECT: invention enables to obtain packed articles with high interphase bonding strength and low turbidity.

38 cl, 8 tbl, 5 dwg, 9 ex

FIELD: agriculture.

SUBSTANCE: polyester capable of biological decomposition is used to treat seed grain. It represents a partially aromatic polyester, comprising: A) single acid component, containing a1) from 30 to 95 mole % of at least one aliphatic or at least one cycloaliphatic dicarbonic acid or their derivatives forming polyesters or mixtures from them, a2) from 5 to 70 mole % of at least one aromatic dicarbonic acid or its derivative forming polyesters or mixture of them and B) single diol component from at least one C2- to C12-alkanediol or one C5- to C10-cycloalkanediol or mixture of them. Molar percents of components from a1) to a2) make 100%. Liquid treatment composition includes (1) one partially aromatic polyester capable of biological decomposition, (2) at least one agrochemical active substance suitable to treat seed grain, (3) one dissolvent. Active substance is in the form of solid particles, having size from 0.1 mcm to 10 mcm. Suspension of agrochemical active substance suitable to treat seed grain, in which active substance is in the form of solid particles with size from 0.1 mcm to 10 mcm, is mixed with dispersion of partially aromatic polyester capable of biological decomposition. Seed grain is treated with polyester or composition.

EFFECT: invention makes it possible to reduce dust formation in treated seed grain.

14 cl, 8 ex

FIELD: chemistry.

SUBSTANCE: material contains the following mixture, wt %: polyalkylene terephthalate - up to 100, polycarbonate 1-35, olefin polymer or copolymer - polyethylene, polypropylene, copolymer of ethylene with propylene 1-10, and synthetic wax 0.03-3, selected from a group comprising ester, amide or polyethylene wax. The material also contains 0.1-1 wt % thermal and thermo-oxidative decomposition stabiliser and 0.01-5.0 wt % colouring additive, which is also a polyalkylene terephthalate structuring agent.

EFFECT: invention enables to obtain polyester composite materials with higher melt flow index.

3 cl, 1 tbl, 21 ex

FIELD: chemistry.

SUBSTANCE: invention relates to polyester compositions containing oxygen-absorbing polydienes and used in packing food products and drinks. The invention describes a composition which contains a combination or a reaction product (i) resins based on aromatic polyester and (ii) hydrogenated polydiene with terminal hydroxyl groups, where 30-70 mol % monomer links of said polydiene are vinyl links or their hydrogenated residues, and in which 60-80% of initial double bonds remain after hydrogenation. Described also is a method of preparing the composition, involving anionic polymerisation of conjugated diene monomer to form polydiene with terminal hydroxyl groups and mixing the aromatic polyester to obtain polydiene.

EFFECT: good oxygen-absorbing properties and prevention of colouring of polyester compositions during secondary processing.

21 cl, 2 ex

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