Grafted copolymer of vinyl acetate on butylketone as a component of vibration-absorbing polymer layer of the layered material (options) and composition for polymer layer of vibration damping laminate

 

(57) Abstract:

The inventive component of vibration-absorbing polymer layer of the laminate can be used grafted copolymer of vinyl acetate on butyl rubber General formula: where a = 98,0 - to 98.4 mol.%, b = 1,5 - 1,8 mol.%, c = 0.1 to 0.2 mol.%, R--CH-CH(OCOH3)dwhere d = 58 - 116 links, molecular weight main chain 1105- 7105or as a component of vibration-absorbing polymer layer of the laminate can be used grafted copolymer of vinyl acetate on halogenated butyl rubber. The formula of the polymer component , where R1is chlorine or bromine, n = 98,5 is 98.8 mol.%, m = 1,1 - 1,3 mol.%, l = 0.1 to 0.2 mol.%, R2- vinyl acetate grafted chain of the formula where f = degree of polymerization equal to 58 - 116. Molecular weight main chain - 1105- 75. The invention also characterizes the composition for a polymer layer of vibration damping laminate. The composition comprises three polymeric substances in wt.h.: copolymer of butyl acrylate, Acrylonitrile and methacrylic acid and of ethylene glycol dimethacrylate - 60 - 70, a copolymer of butyl methacrylate and methacrylic acid - 30 - 40 and one of the above-described graft copolymers vinylacetylene compounds, more precisely to the grafted polymers of vinyl acetate on butyl rubber, the General formula:

< / BR>
where a 98,0-to 98.4 mol.

b 1,5-1,8 mol.

c 0,1-0,2 mol.

d 58 116

MM main circuit 1105-7105< / BR>
MM grafted chain 5103-1104, SP 58 116

The invention relates to graft polymers of vinyl acetate on halogenated butyl rubber, with the General formula:

< / BR>
where R is Br, Cl

n 98,5 is 98.8 mol.

m of 1.1 to 1.3 mol.

e 0,1-0,2 mol.

f 58 116

MM main circuit 1105-7105< / BR>
MM grafted chain 5103-1104, SP 58 116

The invention is also a polymer composition based on the above grafted polymers, this polymer composition is used as a vibration-absorbing polymer layer of the layered material.

All three objects of the invention are connected to form a single inventive concept.

The invention can find application in such industries as aerospace, shipbuilding, automotive, engineering, construction, etc. where you want to reduce the harmful effects of vibration.

Declared grafted copolymers of vinyl acetate on butylketone can have independent ispol +40oC high values of cohesive and adhesive strength.

Abbreviations used terms and their definitions:

BA butyl acrylate of the formula CH2CH-COOC4H9;

BMA butylmethacrylate formula

NAC nitrile of acrylic acid of the formula CH2CH-CN;

DMAG dimethacrylate of ethylene glycol, formulas

VA vinyl acetate, of the formula CH2=CHOCOCH3;

MAC methacrylic acid, of the formula

Bq butyl rubber, formulas

< / BR>
where a 98,0-to 98.4 mol.

b 1,6-2,0 mol.

MM 1105-7105< / BR>
Used Bq brands: BC-1675, BC-2045 (USSR) and Polysar butyl (Canada)

Halogenated butylketone, formulas

< / BR>
where R is Br, Cl, n 98,5 is 98.8 mol.

m 1.2 to 1.5 mol.

MM 1105-7105< / BR>
BBK bromobutyl rubber product synthesized Bq containing 2 to 3% of bromine.

Used BBK brand: Polisar Bromobutyl X-2 (Canada)

KBC chloroticus product of chlorination Bq containing 1.1 to 1.3% chlorine.

Used KBC brands: KBC-155, KBC-165, (Canada) and NT-1067 (USSR)

JV degree of polymerization

The tangent of mechanical loss tg ratio of energy dissipated to complete, connected to the polymer composition in terms of silicibacter, in which the tangent of mechanical loss below 0.5 i.e. tg 0,5

Known polymer composition (1) for intermediate layer of vibration damping laminate containing mixture comprising: a copolymer of butyl acrylate, Acrylonitrile, methacrylic acid and of ethylene glycol dimethacrylate with a ratio of units of monomers:

< / BR>
where n 82-95 wt.

m 5-15 wt.

e 0.5-2.0 wt.

f of 0.5-1.0 wt.

the copolymer of butyl methacrylate and methacrylic acid with a ratio of units of monomers:

< / BR>
where a 97-99 wt.

b 1-3 wt.

a copolymer of isobutylene and isoprene ratio of units of monomers:

< / BR>
where c 97-98 wt.

d 2-3 wt.

in the following components in wt. h

Copolymer of butyl acrylate, Acrylonitrile, methacrylic acid and of ethylene glycol dimethacrylate 60-70

The copolymer of butyl methacrylate and methacrylic acid 30-40

A copolymer of isobutylene and isoprene 60-300

The intermediate layer of vibration damping laminate made of known polymeric composition according to (1), provides a temperature range effective vibroplasty -45oto +90oC (Teff.oC.

A disadvantage of the known polymeric composition as an intermediate polymer layer metal structural material is the low values of adhesion of the intermediate polymer layer to restrict the metal plates. The low level of adhesion of the intermediate polymer layer is not possible to subject the material to large deformations during operation, as well as technological processing: bending at small degrees, shirring, etc.

The aim of the invention is to increase the adhesion strength of the intermediate polymer layer to the limiting metal plates while maintaining a high level values of the tangent of mechanical loss and temperature interval effective vibroplasty.

This goal is achieved by:

1. Grafted copolymer of vinyl acetate on butyl rubber General formula

< / BR>
1. where a 98,0-to 98.4 mol.

b 1,5-1,8 mol.

c 0,1-0,2 mol.

d 58 116

MM main circuit 1105-7105< / BR>
MM grafted chain 5103-1104; SP 58 116

as a component of vibration-absorbing polymer layer laminated meters
< / BR>
where R is Br, Cl

n 98,9 98,5 mol.

m of 1.1 to 1.3 mol.

l 0,1 0,2 mol.

f 58 116

MM main circuit 11057105< / BR>
MM grafted chain 51031104; SP 58 116

as a component of the polymer layer of vibration damping laminate.

3. The composition for vibration-absorbing polymer layer laminated material comprising the following components:

copolymer of butyl acrylate, nitride acrylic acid, methacrylic acid and of ethylene glycol dimethacrylate, with a ratio of units of monomers:

< / BR>
where n 82-94 wt.

m 5-15 wt.

l 0.5 to 2.0 wt.

f of 0.5-1.0 wt.

the copolymer of butyl methacrylate and methacrylate acid with a ratio of units of monomers:

< / BR>
where a 97-99 wt.

b 1-3 wt.

grafted copolymer of vinyl acetate on butyl rubber General formula:

< / BR>
where a 98,0-to 98.4 mol.

b 1,5-1,8 mol.

c 0,1-0,2 mol.

d 58-116

MM main circuit 11057105< / BR>
MM grafted chain 51031104, SP 58 116

or grafted copolymer of vinyl acetate on halogenated butyl rubber General formula:

< / BR>
where R=Br, Cl

n 98,5 is 98.8 mol.

m of 1.1 to 1.3 mol.

l 0,1-0,2 mol.

in the following components in wt.

Copolymer of butyl acrylate, Acrylonitrile, methacrylic acid and of ethylene glycol dimethacrylate 60-70

The copolymer of butyl methacrylate and methacrylic acid 30-40

Grafted copolymer of vinyl acetate on butyl rubber or grafted copolymer of vinyl acetate on halogenated butyl rubber 60-300

The structure and composition of the claimed graft copolymers was confirmed by the data of IR-, NMR-spectroscopy, analysis of unsaturation of the elemental analysis.

The tangent of mechanical loss was determined by the method of forced longitudinal vibrations at a frequency of 660 Hz in the temperature range (-) 80 - 120oC according to the method described in the paper, see laboratory 1976 N 12, T. 42, S. 1517 1519

Evaluation of the adhesion strength (pre-filled (100 wt. including titanium dioxide per 100 wt.h. polymeric compositions and vulcanized materials carried out by testing the shift (GOST 14759-69) flat samples of anodized aluminum AMG-3, thickness 0.8 mm, the thickness of the intermediate polymer layer is 0.4 mm, obtained by pressing under heating at a speed of 2oC/min to 140oC, holding at that temperature for 1 h under a pressure of 20 kgf/URS as not halogenated, so brominated and chlorinated are effective vibration-absorbing materials with a high ratio of the tangent of mechanical loss, high adhesive and cohesive strength, while somewhat narrower temperature range effective vibroplasty.

For a better understanding of the essence of the claimed invention, examples of its specific implementation.

Example 1. Synthesis of copolymer of BA, NAC, POPPY, DMAG.

The copolymer produced by the method of emulsion copolymerization with a single loading BA, NAC, POPPY, and DMAG. As the initiator of the use of potassium persulfate, emulsifier sodium dodecyl sulphate.

In purged with an inert gas to the reactor with a capacity of 1 l equipped with a mechanical stirrer, reflux condenser, thermometer and a fitting for supplying inert gas, fill in the aqueous phase: 300 ml of distilled water, optionally boiled and cooled in a stream of argon to 16.0 ml of 18% aqueous solution of sodium dodecyl sulfate. The solution is stirred 5 min, then add the mixture of monomer e (BA 129,7 g NAC 18,0, MAC 1.5 g of DMAG 0.75 g), stirred for 30 min before the formation of stable emulsions, raise the temperature of the reaction mixture to 601oC using the nation are under stirring (500 rpm) for 5 h, maintaining the reactor temperature 601oC with external cooling or heating.

At the end of the process determine the yield of polymer by evaporation of the sample latex volume of 10 ml. Output is 98% of theory. Unreacted monomer is distilled off with steam, replacing the reflux condenser to direct and connecting the steam generator to the bubbler. In the finished latex dry residue is 30,0%

The obtained copolymer had the following composition (wt.): BA 86,5; NAC - 12, 0MM; MAC 1,0; DMAG 0,5

Similarly synthesized copolymers of different composition, are presented in table. 1 (examples 1 to 6)

The copolymers of the latexes are coagulation Al2(SO4)3or freezing.

Example 2. Synthesis of copolymer BAM, POPPY.

The technique of synthesis of copolymer BAM and MAC are similar to those described in example 1 under the following downloads components:

Distilled water 400 ml

18% aqueous solution of sodium dodecyl sulfate to 8.0 ml

BMA 196,0 g

MAC 4.0 g

The potassium persulfate K2S2O80.4 g in 12 ml of H2O

The output of a copolymer of 99%

The dry residue of the latex after the distillation of the monomer is 31.0% of the resulting copolymer had the following composition, wt.h. BMA 98, "ptx2">

Example 10. Obtaining graft copolymer VA on BC.

Presidency and dried BC in the amount of 9.0 g dissolved in 180 ml of toluene. This solution is placed in a reaction vial, it is injected to 6.6 ml of Al (i Bu)30,57 mol/l (0.02 mol/l). The mixture is kept for 1 h, then give 0.45 g of benzoyl peroxide (PB) (0.01 mol/l), after that enter 12.5 g VA (VA: isoprene 50 1). All contents of the ampules are thoroughly mixed, pumped and the vial sealed. Polymerization was continued for 48 h at room temperature. After that, the contents of the ampoule are planted in acidified acetonitrile. The obtained copolymer twice periostat of toluene in acetonitrile and dried to constant weight. The polymer yield of 9.0 g

In similar conditions (examples 11 and 12) obtained grafted copolymers other butyl rubber, are presented in table. 3.

The structure of the graft copolymers are defined as follows. Inoculation is carried out through-methylene hydrogen atom in isoprene link, the availability of vaccinations confirmed by a change in operational characteristics of the target products: 1.5 to 2 times increased adhesive strength of the intermediate polymer layer. Stage selection guarantees from the known level of science and technology, interaction trialkylamine with isoprene link can also activate with the formation of the primary radical partly to cause destruction.

Such destruction along with the mechanical losses of the mass of the grafted copolymer in the allocation process will not be compensated by the gain due to grafting a polar monomer. This effect should be expected in the case of butyl rubber containing small amounts of isoprene units.

In the application materials indicated that isoprene units used in butylcatechol little (1,6-2,0 mol.) while the proportion of grafted chains is 0.1-0.2 mol.

For example, if the mass of the original butyl rubber 9 g (example 10) gain at the expense of polyvinyl acetate chains of 0.1-0.2 g

Thus, elucidation of the structure of the grafted copolymers in the application materials is not based on the weight of the mass, and various known methods of analysis, primarily on spectral.

During vaccinations MM main chain does not change.

To define the structure of the claimed graft copolymers it is necessary to determine the coefficients a, b, c and a", similarly "n, m, e, f, and MM main chain and MM grafted chains. The coefficient "a" and MM identity5< / BR>
a 98,0 mol. b 2,0 mol. (b' b + c in vaccinated Bq)

BK 1675 MM 7105< / BR>
a 98,4 mol. b' of 1.6 mol.

Polysar butyl 510 MM5< / BR>
a 98,4 mol. b' of 1.6 mol. respectively.

The content of ALL links is determined by quantitative analysis of the IR spectra, based on the definition of the area of the absorption bands in the region 1730 cm-1(C O group PVA).

The content of ALL links in example 10 according to the IR spectra of 6.9 wt. Thus, 9.00 g selected grafted copolymer contains 0,62 g VA-links. It is accepted that MM grafted chains close to MM homopolymerization obtained in the same conditions. Based on these data grafted copolymer contains two grafted PVA chains and "c" 0.1 wt.

The coefficient "d" and "f" or JV grafted chains of polyvinyl acetate determine, based on the known fact (P. Manaresi, V. Passalacqua end F. Pilati, Polymez, 1975, v 16, N 7, p. 520 526).

what MM grafted chains close to MM homopolymerization obtained in the same conditions.

The NMR spectra of grafted copolymers of vinyl acetate to the butyl rubber confirm the saving ratio equal to 2 1 integrated intensities singlet methyl groups in polyisobutylene links (0,95 m D.) groups at C-CH3in branch, Rubezhnoe, Ukraine links (1,6 m s intensities of singlet methyl groups in polyisobutylene links (0,95 m D.) to the methylene groups of the halogenated polyisoprene

(Halogen) in the range of 4.6 to 4.8 M. D. is 3 to 1.

Analysis of graft copolymers on neopredelennosti showed identical results with the original polymers, which confirms the direction of the reaction vaccinations due to the methylene hydrogen atoms of isoprene link and complete preservation of the structure of the circuit during vaccinations.

Thus, a list of all of these methods reflects all the data necessary for the complete identification of the graft copolymers.

Example 13. Obtaining graft copolymer VA on Polisar Bromobutyl X-2.

Supercooled and dried Polisar Bromobutyl X-2 in the amount of 9.1 g dissolved in 160 ml of toluene. This solution is placed in a reaction vial, it is injected to 11.3 ml of Al (i Bu)30.49 mol/l (0.02 mol/l). The mixture is kept for 1 h, then enter to 0.48 g of benzoyl peroxide (0.01 mol/l), after that enter 7.2 g VA (VA: isoprene 50:1). All contents of the ampules are thoroughly mixed, pumped and the vial sealed. Polymerization was continued for 48 h at room temperature. After that, the contents of the ampoule are planted in acidified acetonitrile. The obtained polymer double-periostat of toluene in acetonitrile and dried to constant weight. The output p of the data butyl rubber, presented in table 3.

In examples 13 to 18 use the following source halogenated butylketone.

Polisar Bromobutyl X-2

MM 5105and 710 MM5< / BR>
n of 98.5 mol. m' to 1.5 mol. (m' m + l) inoculated Bq).

KBC-155 MM 1105< / BR>
n 98,8 mol. m' 1,2 mol.

KBC - 165 corresponds foreign brand HT-1067

MM 5105< / BR>
to 98.6 mol. m' of 1.4 mol.

Example 19. Preparation of polymeric compositions mechanical mixture of copolymers.

For the preparation of polymeric compositions 14.0 g of a copolymer BA, NAC, POPPY, DMAG obtained in example 1, was mixed with 6.0 g of copolymer BMA, POPPY obtained in example 7. Then to the mixture was added 12.0 g of the grafted copolymer VA on BC obtained in example 10. Thus obtained composition had a composition in wt.h. (BA copolymer, NAC, POPPY, DMAG):(BMA copolymer, MAK):(grafted copolymer VA on BC) 70:30:60.

Mixing was conducted on a laboratory mixing mill 100 Lb 50/50 at a temperature of 50 60oC.

Similarly prepared with the compositions of examples 20 41 for different ratios of the components, the composition and characteristics of which are presented in table 4.

The analysis of table 4 confirmed until the relevant metal (Fe, Al) plates reaches 18,8-23,4 kN/cm2in the temperature range effective vibroplasty from-35 - -45oC up to 80-90oC when the values of the tangent of mechanical loss of 0.7 to 1.2.

For the solution of the prototype with the same values of temperature interval effective vibroplasty and tangent of mechanical loss in adhesive strengthadddoes not exceed of 11.2 to 12.2 kgf/cm2.

Material when designing may be subjected to various technological operations: bending with a small radius, shirring, etc. so important adhesive strength. So, when using the material on the prototype with the adhesive strength of 11 kg/cm2the material withstands bending only with a radius of up to 300 mm At benching with a smaller radius is exfoliation of the polymer material from the metallic substrate.

The material on p. 3 claims withstands bending with a radius of up to 100 mm

High adhesive strength simplifies technology, excludes other methods of fastening material, especially on curved sections.

The adhesion strength of the composition is close to the adhesion strength of the grafted copolymer. The need component is vibroplasty.

Working intervals graft copolymers, see example 10, example 13, example 16, respectively -44 +65oC, -42 +54oC, -50 TO +68oC if vibroplasty above 0.5, and the adhesive strength is 19,0 23,0 kg/cm2.

For butyl rubber adhesive strength on level 3 of 5 kgf/cm2at the same effective temperature intervals of vibroplasty.

For the composition (see table. 4) when the adhesion strength 19,0-23,4 kN/cm2and the same intervals effective vibroplasty temperature range of the composition is much wider than for an individual graft copolymers -35 +45oC to -85 +90oC.

The analysis of table. 4 also confirmed the relevance of the stated interval parameters:

a) the content of the copolymer BA, NAC, POPPY, DMAG claimed in the range of 60 to 70 wt. including the Reduction of the content of this copolymer to 55 wt.h. (example 41) or increase to 75 wt.h. (example 40) leads to a narrowing of the temperature range effective vibroplasty.

b) the content of the copolymer BMA, MACK claimed in the range of 30 to 40 wt.h. The decrease in the content of the copolymer to 25 wt.h. or increase to 45 wt.h. (examples 38 and 39) also leads to a narrowing of the temperature range Eremitage copolymer claimed in the range of 60 to 300 wt.h. The decrease in the content of the grafted copolymer of 50 wt.h. (example 37) or increase to 350 wt.h. (example 36) is accompanied by a narrowing of the temperature range effective vibroplasty.

1. Grafted copolymer of vinyl acetate on butyl rubber General formula

< / BR>
where and 98,0 to 98.4 mol.

b 1,5 1,8 mol.

0.1 0.2 mol.

d 58 116;

mol. m main circuit 1 1057 105;

mol. M. grafted chains 5 1031 104; SP 58 116,

as a component of the polymer layer of vibration damping laminate.

2. Grafted copolymer of vinyl acetate on halogenated butyl rubber General formula

< / BR>
where R is Br, Cl;

n 98,5 98,8 mol.

m of 1.1 to 1.3 mol.

l 0,1 0,2 mol.

f 58 116;

mol. m main circuit 1 1057 105;

mol. M. grafted chains 5 1031 104; SP 58 116,

as a component of the polymer layer of vibration damping laminate.

3. Composition for vibration-absorbing polymer layer laminated material comprising a copolymer of butyl acrylate, Acrylonitrile, methacrylic acid and dimethacrylate, ethylene glycol and a copolymer of butyl methacrylate and methacrylic acid, characterized in that, is Stina while maintaining the level values of the tangent of mechanical loss and temperature interval effective vibroplasty, the composition further comprises a grafted copolymer of vinyl acetate on butyl rubber General formula

< / BR>
where and 98,0 to 98.4 mol.

1.5 to 1.8 mol.

0.1 0.2 mol.

d 58 116;

mol. m main circuit 1 1057 105;

mol. M. grafted chains 5 1031 104;

SP 58 116,

or grafted copolymer of vinyl acetate on halogenated butyl rubber General formula

< / BR>
where R is Br, Cl;

n 98,5 98,8 mol.

m of 1.1 to 1.3 mol.

l 0,1 0,2 mol.

f 58 116;

mol. m main circuit 1 1057 105;

mol. M. grafted chains 5 1031 104;

SP 58 116,

in the following ratio, wt.h.

Copolymer of butyl acrylate, Acrylonitrile, methacrylic acid and of ethylene glycol dimethacrylate 60 70

The copolymer of butyl methacrylate and methacrylic acid 30 40

Grafted copolymer of vinyl acetate on halogenated butyl rubber 60 - 300

 

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2 cl, 1 tbl, 5 ex

FIELD: polymerization processes.

SUBSTANCE: cracking- and impact-resistant polystyrene is prepared via bulk prepolymerization or prepolymerization in presence of inert solvent accomplished by stirring solution of blended butadiene rubber and modifying rubber in styrene at elevated temperature until phase inversion in presence of molecular mass regulator is completed while initiating polymerization by organic peroxides or thermally, after which polymerization process in bulk or in aqueous suspension is completed. Specifically, modifying rubber is ethylene-propylene-diene rubber having Mooney viscosity (ML 1+8, 125°C) 26-25 taken in amount 1.0-1.5% based on the total weight of reactants, and prepolymerization of solution of blended butadiene and modifying rubbers in styrene results in forming rubber particles having average size 3.5 to 6.0 μm and characterized by content of gel 26-30% and gel swelling index in final polymer 11-16, whereas prepolymerization process is carried out to achieve conversion of styrene 24-35 wt %.

EFFECT: achieved high cracking resistance while preserving high impact resistance and good processing ability.

7 cl, 1 tbl, 20 ex

FIELD: chemistry.

SUBSTANCE: said invention relates to rubber-reinforced vinylarene polymers. Rubber-reinforced vinylarene (co)polymers are described. They have strictly bimodal morpholgy and consist of 55-90 wt % of rigid polymer matrix and 10-45 wt % of rubber-like phase dispersed in the said rigid polymer matrix in the form of grafted and occluded particles. The said rubber particles consist of 60-99 wt % of capsular, or "coat-core" type, particles and 1-40 wt % of "salami"-type particles, percent ratios being specified for rubber particles weight only. Difference between Hildebrand solubility parameter of elastomer, which forms rubber-like "capsular" particles and Hildebrand solubility parameter of elastomer, which forms "salami"-type particles, is 0.5 or over, mean diameter of "coat-core" type particles is 0.10 to 0.30 mcm, and mean diameter of "salami"-type particles is 1 to 5 mcm. Also, continuous process for production of bulk and suspended rubber-reinforced vinylarene (co)polymers is described.

EFFECT: production of rubber-reinforced vinylarene polymers, which contain particles of strictly bimodal distribution, with improved mechanical properties.

15 cl, 4 dwg, 1 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: invention refers to method for producing vinylaromatic (co)polymers grafted on elastomer by controlled way. There is method for producing vinylaromatic (co)polymers grafted on elastomer by controlled way, involving as follows: a) elastomer is dissolved in liquid phase consisting of mixed vinylaromatic monomer and polymerisation solvent in ratio within 60/40 to 100/0; b) the solution is added with catalyst polymerisation system consisting of free-radical initiator (G) of functionality F, removing proton from polymer elastomeric chain, and stable free radical initiator including group =N-O (I) at molar ratios I/GF lower than 4; c) the stirred mixture resulted from the stage (b) at temperature 80 to 110°C, during time required to enable the complete functionalisation of elastomer; d) vinylaromatic monomer is delivered to the mixture containing dissolved functionalised elastomer, while prepared mixture is polymerised at temperature 120°C and higher, preferentially within 120 to 200°C; e) vinylaromatic polymer resulted from polymerisation is separated and degassed in vacuum environment to remove the solvent and unreacted monomer; and f) mixed solvent/monomer are recycled to the stage (a).

EFFECT: ensured production of morphological variety of end-product.

8 cl, 1 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: proposed is a polymer material with low stickiness, which has a carbon-carbon polymer skeleton with a straight or branched chain and several side chains, joined to this skeleton, where the side chains directly bonded to carbon atoms of the polymer skeleton have formula (I) or formula (II) , where R1 is H, -C(O)OR4 or -C(O)Q, and R2 is -C(O)OR4 or -C(O)Q, under the condition that, at least one of R1 and R2 is a -C(O)Q group; R3 is H or -CH3; R4 is H or an alkyl group with 1 to 6 carbon atoms; Q is a group with formula -O-(YO)b-(ZO)c-R5, where each of Y and Z independently represent an alkylene group, with 2 to 4 carbon atoms, and R5 is H or an alkyl group with 1 to 4 carbon atoms; a equals 3 or 4, and each of variables b and c independently equals 0 or an integer from 1 to 125, under the condition that, the sum b+c lies between 10 and 250, preferably from 10 to 120.

EFFECT: said polymer material can be substituted for part of a water-soluble gum base in a chewing-gum composition, thereby obtaining a composition with low adhesion to surfaces.

47 cl, 7 dwg, 2 tbl

FIELD: chemistry.

SUBSTANCE: invention can be used in production of rigid transparent containers or other packaging materials, particularly for food products and drinks, made through traditional hot shaping or other moulding processes or profiling with high degree of alignment. The polymer composition contains a matrix of monovinylidene aromatic polymer and from 1.5 to 8.0 vol % rubber which is dispersed in form of cross-linked rubber particles with volume dimension from 0.1 to 1.5 mcm, having a nucleus/shell morphology. The rubber contains conjugated diene block-copolymer rubber containing from 15 to 60 wt % blocks of monovinylidene aromatic monomer and optionally from 1 to 4 wt % mineral oil.

EFFECT: polymer composition has improved combination of strength, manufacturability and transparency.

17 cl, 7 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention describes a method for synthesis of shock resistant vinylaromatic (co)polymers which are grafted onto an elastomer, containing a rigid matrix formed by vinylaromatic polymers or copolymers, and an elastomeric phase dispersed in the matrix in form of particles with strict bimodal distribution according to diametre, involving: 1) functionalisation of the first portion (X1) of the elastomer using a functionalisation/polymerisation catalyst system formed by a free-radical polymerisation initiator (G) with number F of functional groups capable of pulling a proton from the polymer chain of the elastomer, and a stable free-radical polymerisation initiator (I) which contains a = N-O' group and a = N-O-R' group in molar ratio (I)/G·F between 1 and 3, where F is equal to the number of functional groups per molecule of the initiator, which gives two free radicals through decomposition, R' is a C1-C6 (iso)alkyl radical or a C7-C20 arylalkyl radical, possibly containing heteroatoms; 2) mixing the functionalised elastomer with the second portion (X2) of the elastomer for a period of time sufficient for obtaining a homogeneous composition; 3) addition of the homogeneous elastomer composition to a liquid phase essentially formed by a mixture of vinylaromatic monomer and a polymerisation solvent with weight ratio from 60/40 to 100/0 and ratio (X1+X2)/vinylaromatic monomer greater than or equal to 8/92; 4) polymerisation of the vinylaromatic monomer, possibly in the presence of one or more comonomers at temperature higher than or equal to 120°C, 5) extraction of the obtained vinylaromatic polymer at the end of polymerisation; and 6) possible return of the mixture of solvent and monomer coming from the extraction process to step (1) after separation of possibly polar comonomers. The invention also describes a method for synthesis of shock resistant vinylaromatic (co)polymers which are grafted onto an elastomer, containing a rigid matrix formed by vinylaromatic polymers or copolymers, and an elastomeric phase dispersed in the matrix in form of particles with strict bimodal distribution according to diametre (versions).

EFFECT: obtaining an end product in which distribution of diametres of particles of a dispersed elastomeric phase is strictly bimodal.

14 cl, 12 dwg, 7 ex

FIELD: polymer materials.

SUBSTANCE: composition comprises polyolefin A, containing anhydride function and having viscosity at least 20 g/10 min measured at 190°C and loading 2,16 kg, and epoxy function-containing product B destined for cross-linking polyolefin A. Relative proportions of A and B are such that for each epoxy function there are from 0.1 to 1.5 anhydride functions. Composition can be used in slush molding process, in thermal molding of sheets, or in on-rod casting process.

EFFECT: increased flowability resistance and wear resistance.

6 cl, 1 tbl, 6 ex

FIELD: polymers, in particular composition for molded articles useful in building materials.

SUBSTANCE: claimed composition contains (A) 100 mass pts of vinyl chloride-based resin; (B) from 1 to 30 mass pts of graft copolymer obtained by graft polymerization; (C) from 0.1 to 5 mass pts of methylmethacrylate-based polymer obtained by two-step method in presence of polymer, wherein 0.1 g of said polymer in 100 ml of chloroform has intrinsic viscosity (ηsp) at 30°C of 0.7 or more and contains 0-50 mass % of methylmethacrylate repeated units, and 0.1 g of in two step obtained polymer in 100 ml of chloroform has intrinsic viscosity (ηsp) at 30°C of 0.5 or more; and (D) from 1 to 20 mass pts of calcium carbonate.

EFFECT: articles with high processibility, whether resistance, impact resistance and luster.

5 cl, 19 ex, 3 tbl

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