Method of control of polymer particles distribution on sizes in proceeding of water polymer dispersion, water polymer dispersion and its application

FIELD: chemistry.

SUBSTANCE: method of controlling the size distribution of polymer particles formed during the preparation of the aqueous polymer dispersion is described; it comprises: preparing an aqueous solution of a polysaccharide which comprises: (a) 10 to 40 wt % of a polysaccharide containing a free hydroxyl group such as starch, polymerization in a solution of the polysaccharide in the presence of a water-soluble oxidation-reduction system for crosslinking by grafting; (B) from 30 to 60 wt % of at least one optionally substituted styrene, (c) from 60 to 30 wt % of at least one C1-C4 alkyl (meth) acrylate, (d) from 0 to 10 wt % of other ethylenically unsaturated copolymerizable monomers, wherein the sum of (a)+(b)+(c)+(d) is 100%. The polysaccharide is an anionic starch derivative, and the size distribution of the polymer particles obtained is controlled by adjusting the viscosity of the polysaccharide solution before polymerization to a level of <10 mPaSec⋅, with a solid content of 15%, as measured at 23°C using a Brookfield LVDV viscometer with a spindle 18 at 60 rpm. An aqueous polymer dispersion for use in the pulp and paper industry is also described.

EFFECT: preparation of an aqueous polymer dispersion containing small particles, with a narrow size distribution.

15 cl, 1 tbl, 7 ex

 



 

Same patents:

FIELD: chemistry.

SUBSTANCE: method involves the addition of an aqueous emulsion, comprising a reactive sizing agent and an insolubilising agent, either separately or in a blended form to aqueous pulp slurry and forming the slurry into cardboard or paperboard. The reactive sizing agent comprises at least 30 wt % of a linear saturated fatty acid anhydride C14-22. The insolubilising agent selected from the group consisting of alum (aluminium sulphate) and polyaluminumchloride (PAC).

EFFECT: invention makes it possible to increase the paperboard resistance to hot hydrogen peroxide solution and lactic acid.

10 cl, 9 tbl, 6 ex

FIELD: textiles, paper.

SUBSTANCE: invention relates to the pulp and paper industry. The method comprises application of water-resistance emulsion, manufacturing of perform of corrugated cardboard, flexographic printing for application of crease lines and printing and application of the water-resistance emulsion. The water-resistance emulsion is fed into the printing plate of the flexographic machine and transferred uniformly on the plane and ends of the perform coming into this form before flexographic printing, and the water-resistance emulsion is used as water emulsion of paraffin having a particle size up to 1 micron with the paraffin content of 50 -90%.

EFFECT: invention enables to simplify the method of applying the water-resistance coating and to improve the uniformity of the applied water-resistance layer.

2 ex

FIELD: chemistry.

SUBSTANCE: invention relates to emulsion for paper gluing, which includes gluing agent based on maleated vegetable oil, representing maleated triglyceride, in which at least 50 wt % of the total content of fatty acids in triglycerides are monounsaturated. Invention also relates to paper-gluing agent, including maleated vegetable oil, in which at least 50 wt % of the total content of fatty acids in triglycerides are monounsaturated, and alkenyl succinic anhydride, and/or fatty acid anhydride, and/or anhydride of fatty acid and acetic acid, and/or anhydride of fatty acid and rosin acid. It also relates to method of obtaining paper-gluing emulsion, including emulsification of gluing agent based on maleated vegetable oil, which represents maleated triglyceride, in which at least 50 wt % of the total content of fatty acids in triglycerides are monounsaturated, in water phase by means of emulsifier and/or by means of intensive mixing; or mixing maleated vegetable oil, which represents maleated triglyceride, in which at least 50 wt % of the total content of fatty acids in triglycerides are monounsaturated, with alkenylsuccinic anhydride and/or fatty acid anhydride.

EFFECT: invention makes it possible to increase gluing efficiency.

26 cl, 17 ex, 7 tbl, 6 dwg

FIELD: textiles, paper.

SUBSTANCE: invention relates to pulp and paper industry and relates to a method and system of use of starches with a low content of fatty acids in the sizing composition for paper, to inhibit the precipitation of multivalent salts of fatty acids. The method of inhibiting the precipitation of multivalent saturated fatty acids on the equipment and/or devices for sizing of paper consists in using the composition for sizing the paper surface, containing elevated levels of starch solids for sizing the surface, and the source of polyvalent cations, such as drying salt of multivalent metal, by including (wholly or partially) one or more starches with low content of fatty acids for sizing the surface in the composition for sizing the paper surface.

EFFECT: invention provides a sized paper having improved properties.

24 cl, 4 dwg

FIELD: textiles, paper.

SUBSTANCE: group of inventions discloses the size press compositions and methods of production of sized paper products including linerboard. The size press compositions comprise at least one non-reactive cationic surface sizing agent, at least one reactive sizing agent, at least one reinforcing resin, at least one binder, and water. At least one non-reactive cationic surface sizing agent may be a polymer in the form of dispersion, emulsion or latex, with positive zeta-potential at a pH lower than about 6. At least one reactive sizing agent can be a dispersion, emulsion or latex, including alkyl ketene dimer or alkyl succinic acid anhydride. At least one reinforcing resin may be a polyamidoamine-epichlorohydrin resin, or poly(dimethyldiallylammonium chloride). In the method of preparation of the paper composition the size press composition is applied to paper or cardboard, and the composition comprises its components in the predetermined ratio of ingredients.

EFFECT: reduction of impact of reactive sizing agents on the friction coefficient of the finished paper or paperboard.

15 cl, 7 tbl, 7 ex

FIELD: printing.

SUBSTANCE: invention relates to recording sheets used in printing processes. The recording sheet comprises a substrate of the web of cellulosic fibres and the sizing composition. The sizing composition comprises a binder and a divalent metal salt. The said salt in a concentration of at least 51% of the total concentration and not less than 2500 parts per million is located at a distance within 25% of the total substrate thickness from at least one surface of the said substrate. At that the recording sheet has Qtotal as a measure of the amount of the sizing agent in the transition from the outer edges towards the middle of the sheet in cross-section of less than 0.5. Also a method of production of the recording sheet is described.

EFFECT: said substrate and the sizing agent interact with formation of the I-shaped structure of the recording sheet which provides an optical density of black printing of at least 1,15.

20 cl, 15 dwg, 2 tbl, 10 ex

FIELD: textiles, paper.

SUBSTANCE: invention relates to compositions for coating of printing paper, at that the said compositions comprise microfibrillated cellulose (MFC) and one or more polysaccharide hydrocolloids, and the application of the said compositions. In addition, the invention relates to the coated paper comprising a first layer of polysaccharide hydrocolloid(s) and a second layer of MFC, and the use of the said paper.

EFFECT: reduction of garnetting or fuzzing of paper.

20 cl, 13 dwg

FIELD: chemistry.

SUBSTANCE: binder for making paper and cardboard contains carbamide, formaldehyde, melamine, cationic starch, glycerine, sodium silicate and a surfactant which contains fatty alkylamidopropylbetaine, with the following ratio of components, wt %: carbamide 29-36; formaldehyde 35-42; melamine 11-12; cationic starch 3-5; glycerine 2-4; sodium silicate 1-12; surfactant 3-6.

EFFECT: invention enables to obtain binder for making paper and cardboard, which meets requirements for mechanical strength, water-resistance and toxicity, with high stability of aqueous dispersions.

2 cl, 2 tbl

FIELD: textiles, paper.

SUBSTANCE: method of production of paper pulp for making filled kinds of paper with use of calcium carbonate as the filler comprises preparing suspensions of milled cellulose and calcium carbonate, adding to them of the predetermined amounts of the modifying agent in the form of nano powders of oxide or hydroxide of aluminium or their mixtures, mixing the dispersions to obtain a fibrous mass, and adding to it of the gluing component and the auxiliary agent to obtain the paper pulp. As a gluing component the alkylketene dimer is used, and as an auxiliary agent the cationic starch is used in amounts of 0.3-0.4, and 0.5-0.7%, based on dry substance in the paper pulp.

EFFECT: increased degree of retention of the filler.

1 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: invention includes (a) at least one optical bleaching agent of formula (1) , wherein R1 denotes hydrogen or SO3M, R2 denotes hydrogen or SO3M, R3 denotes hydrogen or CH2CO2M, R4 denotes CH2CO2M, CH(CO2M)CH2CO2M or CH(CO2M)CH2CH2CO2M, where M denotes hydrogen, a cation of an alkali metal, ammonia, mono-methyl-di-C2-C3-hydroxyalkylammonium, dimethyl-mono-C2-C3- hydroxyalkylammonium, ammonium, which is mono-, di- or trisubstituted with a C2-C3 hydroxyalkyl radical, or a mixture of said compounds, (b) a magnesium salt or (c) binder, which is selected from a group consisting of natural starch, enzyme-modified starch, and chemically modified starch, wherein there are 0.1-15 parts of component (b) for one part of component (a). The invention also relates to a method of bleaching paper using said composition.

EFFECT: composition is a more efficient means of achieving high paper whiteness.

9 cl, 4 ex, 3 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to biotechnology and medicine, and specifically to a method of producing film-type and composite materials based on chitosan and polylactide, which are biodegradable, biocompatible and hypoallergenic. Described is a method of producing composite biodegradable materials based on chitosan and polylactide, which includes preparing polysaccharide and polylactide solutions using a mixed solvent, wherein the chitosan solution is mixed with 10-50% polylactide solution with respect to the mass of chitosan while stirring continuously. The obtained mixture is subjected to ultrasonic treatment until a block-copolymer of chitosan and polylactide is obtained. Disclosed materials can be used in articles for biomedical purposes, including osteosynthesis materials and prolonged action medicinal drug carriers.

EFFECT: obtained materials are used for osteosynthesis based on natural and synthetic polymers, decomposition products of which prevent the development of toxic, inflammatory and allergic reactions in tissue owing to use of a chitosan biopolymer.

2 cl, 1 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: invention relates to graft copolymer from lignin, which can be used as additive to drilling mud. Method of obtaining graft copolymer from lignin includes reaction of lignocelluloses material with acryl compound at from 60°C to 100°C in nitrogen atmosphere in presence of non-oxidising strong organic acid as catalyst. Reaction mixture is separated with zinc sulphate solution to obtain solid phase, containing mainly lignocelluloses materials, and liquid phase, containing graft copolymer from lignin and acryl compound that did not react. Liquid phase is subjected to evaporation to obtain graft copolymer from lignin. Lignocellulose materials are obtained from wastes of oil palm processing. Application of obtained graft copolymer from lignin in drilling mud as gel-forming and thickening agent and drilling mud, including from 0.3% to 0.7% of said copolymer from lignin.

EFFECT: invention ensures obtaining effective, economical, environmentally friendly gel-forming and thickening agent for drilling mud.

8 cl, 3 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to thermoreactive polymers. Described is composite, which includes: formaldehyde-free binding substance, which includes polyvinyl alcohol and one or more linking agents for hydroxyl polymer, selected from sodium trimethaphosphate, sodium trimethaphosphate/sodium tripolyphosphate and phosphorus oxychloride, polyamide/epichlorohydrin linking agents, cyclic amide condensates, and their combinations, in which polyvinyl alcohol and one or more linking agents for hydroxyl polymer are free of aldehydes; and substrate of mineral wool, processed with water solution of binding substance. Method of obtaining claimed composite is described.

EFFECT: reducing of toxicity.

12 cl, 2 tbl, 2 ex

FIELD: organic chemistry.

SUBSTANCE: graft method of functional group to polysaccharide polymer of galactomannan type, preferentially to guar by means of high-energy electron beams radiation with non-saturated monomer occurrence containing specified functional group. Method can contain depolymerization of graft-polymer up to specified molecular weight. Prefential galactomannan processed under this method is guar gum, guar endosperm and hydroxypropylguar. According to preferential variant of method realization guar gum is also depolymerized, preferentially to molecular weight lower than approximately 700000 daltons and the most preferentially to molecular weight from approximately 100000 daltons to approximately 250000 daltons. According to the most preferable variant depolymerized guar has polydispersity lower, approximately 3.0. Graft-polysaccharide is applied in cosmetic formulations such as moisturizing stick.

EFFECT: possibility for functional groups graft to polysaccharide polymer by means of high-energy electron beams radiation.

17 cl, 1 dwg, 6 tbl, 5 ex

The invention relates to a polymer dispersion based on starch, which contains a copolymer of starch and monomer

The invention relates to fototermin derived fractions, each of which receive chemical binding photoreactive connection with glycosaminoglycans /hereinafter sometimes referred to for brevity as a "GAG"/ and stitched glycosaminoglycans having a three-dimensional netted structure which is obtained by exposing the above derived expression for the dimerization photoreactive compounds, to processes for their preparation, and, further, to a satisfactory biocompatible materials for medical use, which contain them

The invention relates to water-soluble, acid containing groups of the grafted copolymers with biological destruction based on sugars and monomethylethanolamine carboxylic acids, sulphonic acids and/or phosphonic acids or salts of these acids, and, if necessary, other monomers, and also to a method for producing these copolymers at temperatures up to 200oC using radical polymerization initiators

Antimutagen // 2101915
The invention relates to the field of genetics of agricultural plants, in particular to substances that have anti-mutagenic activity under the action of gamma radiation

FIELD: chemistry.

SUBSTANCE: invention relates to application of polymers, which contain ester groups, as antifatigue additives. Described is application of ester group-containing polymers with, at least, one non-polar segment P, characterised by the fact that it is obtained by polymerisation of monomer composition, which includes a) from 0 to 40 wt %, counted per the weight of monomer mixture for obtaining non-polar segments, one or several ethylene-unsaturated esters of formula (I), in which R stands for hydrogen or methyl, R1 stands for non-branched or branched alkyl residue with 1-6 carbon atoms, R2 and R3 stand for hydrogen, b) from 5 to 100 wt %, counted per the weight of monomer mixture for obtaining non-polar segments, of one or several ethylene-unsaturated esters of formula (II), in which R stands for hydrogen or methyl, R4 stands for non-branched or branched alkyl residue with 7-15 carbon atoms, R5 and R6 stand for hydrogen, c) from 0 to 80 wt %, counted per the weight of monomer mixture for obtaining non-polar segments, of one or several ethylene-unsaturated esters of formula (III), in which R stands for hydrogen or methyl, R7 stands for non-branched or branched alkyl residue with 16-30 carbon atoms, R8 and R9 stand for hydrogen, and d) from 0 to 50 wt %, counted per the weight of monomer mixture for obtaining non-polar segments, of comonomer, and at least one polar segment D, containing at least eight repeated units, and content of dispersing repeated units in segment D constitutes at least 30 wt %, counted per the weight of segment D, with dispersing repeated units being derivatives of one or several ethylene-unsaturated polar esters of formula (IV), in which R stands for hydrogen or methyl, X stands for oxygen, sulphur or aminogroup of formula -NH- or -NRa-, in which Ra stands for alkyl residue with 1-40 carbon atoms, R10 stands for residue with 2-20 carbon atoms and at least one heteroatom, R11 and R12 group of formula respectively independently on each other stand for hydrogen or -COX'R10', in which X' stands for oxygen or aminogroup of formula -NH- or -NRa'-, in which Ra' stands for alkyl residue with 1-40 carbon atoms, and R10' stands for residue with 1-100 carbon atoms, and/or derivatives of heterocyclic vinyl compounds, as antifatigue additive in lubricating materials.

EFFECT: obtaining antifatigue additive, ensuring reduction of fatigue chipping to minimum.

20 cl, 3 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: described is a core-cladding emulsive polymerisate with an activator included in the core, which is obtained from polymerising a mixture containing: a) 5-99.9 wt % of one or more mono-functional (meth)acrylate monomers with water solubility of < 2 wt % at 20°C; b) 0-70 wt % of one or more monomers that copolymerisable with monomers a); c) 0-20 wt % of one or more compounds that are di- or multi-vinylenically unsaturated; d) 0-20 wt % of one or more polar monomers with water solubility of >2 wt % at 20°C, selected from (meth)acrylic acid and (meth)acrylamide, and c) 0.1-95 wt % of at least one activator. Wherein components a) to e) amount to 100 wt % of polymerisable components of the mixture, characterised by that e1) the activator is a compound of formula I where R1 is methyl; X is a linear alkanediiyl group with 1-18 carbon atoms; R2 denotes a hydrogen atom or a linear or branched alkyl residue with 1-12 carbon atoms; R3, R4, R5, R6 and R7 independently denote a hydrogen atom and that e2) the activator e) is covalently bonded to the emulsive polymerisate. Also described is a method of producing said emulsive polymerisate by "core-cladding" polymerisation in an aqueous emulsion, wherein components a) to e) at the first step are polymerised in form of a core, and then a mixture of components a) to d) are polymerised thereon as cladding in at least an additional step. Components a) to e) for the core and components a) to d) for the cladding are selected such that in the resultant polymerisate, the glass transition temperature of at least one cladding TGS is higher than the glass transition temperature of the core TGK, wherein the glass transition temperature of at least one cladding TGS is higher than 100°C, wherein the glass transition temperature TG is determined according to the EN ISO 11357 standard. Described is a two- or multi-component system with a controlled working life, which is curable at room temperature using a redox system of initiators containing A) 0.8-69.94 wt % emulsive polymerisate according to claims 1-7 or obtained by a method according to claim 8; B) 30-99.14 wt % of one or more ethylenically unsaturated monomers; C) 0.05-30 wt % peroxides; optionally D) 0-60 wt% unsaturated oligomers; E) 0.01-2 wt % polymerisation inhibitor; and optionally F) 0-800 pts.wt auxiliary substances and additives; wherein the sum of components A)+B)+C)+D)+E) is 100 wt %, and the amount of F) relates to 100 pts.wt of the sum A)+B)+C)+D)+E). Wherein component A) and component C) are stored together, and before applying the system, at least one component B) is stored separately from A) and C), wherein the capacity of the separately stored component B) to cause swelling of the polymerisate A) is so high that the activator of the polymerisate A) fixed in the polymer can react with component C), or component A), part of component B) and component DC) are stored together, wherein part of component B) is selected such that the capacity of component B) to cause swelling of the polymerisate A) is so low that the activator of the polymerisate A) fixed in the polymer cannot react with component C). Also described is use of said two- or multi-component system as a component part of substances, such as resins from unsaturated polyesters and vinyl esters or adhesive substances, cast resins, polymer coatings for floors and other reactive coatings, sealants, impregnating compounds, binding compounds, compounds for making artificial marble and other artificial stones, compounds for reactive concrete inserts, tooth filling compounds, porous plastic moulds for ceramic articles.

EFFECT: obtaining two- or multi-component systems that are curable at room temperature, the working life of which can be controlled in a wide range and which, nevertheless, are quickly and completely curable before a certain moment in time without requiring energy or an external mechanical pulse.

13 cl, 2 tbl, 19 ex

FIELD: chemistry.

SUBSTANCE: invention relates to methacrylic resin, an article moulded therefrom and a method of producing methacrylic resin. The methacrylic resin contains 80-99.5 wt % of a monomer link of a methacrylic ester and 0.5-20 wt % of another vinyl monomer link, which is copolymerised with at least one of the methacrylic esters, where the methacrylic resin satisfies the following conditions (I)-(III): (I) has weight-average molecular weight, measured by gel permeation chromatography, ranging from 60000 to 300000; (II) has content of a component with molecular weight of 1/5 or less of the peak molecular weight (Mp), obtained from an elution curve during gel permeation chromatography, wherein said content ranges from 7% to 40% of the degree of expansion of the area of the region obtained from the elution curve during gel permeation chromatography; and (III) has angle of repose from 20° to 40°.

EFFECT: resin is characterised by good non-colouring capacity, transparency, resistance to impact loads, resistance to solvents, while maintaining high resistance to heat ageing.

12 cl, 5 tbl, 4 dwg, 20 ex

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