Abstract: The present invention relates to a process for producing a thermoplastic molding composition and articles made thereof having improved surface quality, in particular improved surface quality after exposure to warm-humid environmental conditions. The thermoplastic molding composition comprises a thermoplastic polymer A, a graft copolymer B obtained by emulsion graft polymerization and optionally a further polymer component P, as well as optional further components/additives K, wherein at least one crystallization additive C, selected from phosphate compounds having 1 to 25 phosphate units, organic acids and salts thereof, is added during or after the preparation of the graft copolymer B.

Abstract: A method for producing a polymer containing silica that does not involve long kneading time, and a polymer composition having an intended low heat generation property. A polymerization catalyst composition is produced by mixing and aging a second element and a third element, and then adding a first element to the mixture to react the first element with the mixture. The first element contains a compound that contains a rare earth metal element, the second element contains a compound represented by the following formula (X), and the third element contains silica. YR1aR2bR3c (X) (In the formula, Y is a metal; R1 and R2 are hydrogen atoms or hydrocarbon groups; and R3 is a hydrocarbon group, and R1, R2, and R3 are the same as or different from each other, a, b, and c are 0 or 1.

Abstract: A non-carboxylated styrene-butadiene copolymer, preparation method and use thereof are provided. The non-carboxylated styrene-butadiene copolymer is prepared by hot polymerization in the absence of acid monomers and is used in asphalt-based systems such as asphalt emulsions.

Abstract: A non-carboxylated styrene-butadiene copolymer, preparation method and use thereof are provided. The non-carboxylated styrene-butadiene copolymer is prepared by hot polymerization in the absence of acid monomers and is used in asphalt-based systems such as asphalt emulsions.

Abstract: The present invention relates to a process for preparing a polymer latex that includes comprising polymerizing one or more ethylenically unsaturated aromatic monomers and one or more conjugated diene monomers in the presence of a hydroperoxide chain transfer agent and sulfur-containing chain transfer agent, wherein the sulfur-containing chain transfer agent is added after the hydroperoxide chain transfer agent. It further relates to the polymer latex thus obtained, to a composition comprising the polymer latex and to the use of the polymer latex or polymer latex composition in a carpet backing, paper coating, or fiber fabric pre-impregnation process.

Abstract: An emulsion polymerization is carried out using one or more polymerizable unsaturated monomers X having at least one carbon-carbon double bond in a molecule, one or more reactive emulsifiers Y having at least one polymerizable group in a molecule, and one or more polyfunctional monomers Z1 having two or more polymerizable unsaturated groups in a molecule and having a molecular weight per functional group of less than 150, or one or more hydrophilic monomers Z2 having one polymerizable unsaturated group and a hydrophilic group in a molecule and having an average molecular weight of less than 250, with a proportion of the total mass of the polyfunctional monomer Z1 or hydrophilic monomer Z2 to the total mass of the reactive emulsifier Y being in the range of Z1/Y=1/3 to 1/30 or Z2/Y=1/1 to 1/30.

Abstract: A latex of a chloroprene polymer formed from one or more monomers comprising 2-chloro-1,3-butadiene as the main monomer ingredient, characterized in that the solid matter in the polymer latex has a gel content less than 3 mass %, the solid matter in the polymer latex includes a tetrahydrofuran-soluble component having a weight-average molecular weight of from 550,000 to 1,100,000 and a molecular-weight distribution (Mw/Mn) of from 2.0 to 3.1, and the dried solid matter in the polymer latex has a crystallization rate (R) represented by hardness increase at ?10° C. (R is the time required for initial hardness (time=0) to increase by 30 points at ?10° C. as measured according to JIS-K6301) less than 60 minutes. The chloroprene polymer latex has an excellent balance among initial bond strength, contact adhesion, and water resistance. This latex is useful as an adhesive and can be used in applications where heat resistance of 60° C. or higher, initial bond strength, and contact adhesion are required.

Abstract: A non-carboxylated styrene-butadiene copolymer, preparation method and use thereof are provided. The non-carboxylated styrene-butadiene copolymer is prepared by hot polymerization in the absence of acid monomers and is used in asphalt-based systems such as asphalt emulsions.

Abstract: A process for the preparation of monodisperse polymer particles which are formed by contacting monomers with aqueous dispersions comprising monodisperse swellable seed polymers/oligomers, and initiating polymerization in the presence of a steric stabilizer. The resulting swollen seed particles are characterized by the particle mode diameter.

Abstract: The invention is directed to a microemulsion polymerization comprising adding a polymerization catalyst precursor, such as a transition metal complex in the higher of two accessible oxidation states, an ATRP initiator, and an organic solvent to an aqueous solution to form an emulsion. Radically polymerizable monomers and a reducing agent may then be added to the emulsion. The reducing agent converts the catalyst precursor to a catalyst for polymerization of the first monomer from the initiator. In certain embodiments the organic solvent may comprise radically polymerizable monomers. The aqueous solution may comprise a surfactant.

Abstract: Process for producing aqueous polymer dispersions using water-soluble metal-carbene complexes.

Abstract: Polymerizing an ethylenically unsaturdated monomer in an aqueous medium can produce an aqueous polymer dispersion. The polymerization is in the presence of a dispersant and a metal-carbene complex. The polymerization can also optionally be in the presence of a dispersant, an organic solvent with low solubility in water, or both. The aqueous polymer dispersion resulting from the process can be used to make a polymer powder.

Abstract: The present invention relates to styrene-butadiene copolymers (SBR) that are prepared using aqueous emulsion polymerization technology and are intended for the adhesive and sealing industry, being particularly useful in the preparation of contact adhesives and pressure-sensitive adhesives (PSA) and widely applicable in the footwear and furniture industries. The use of this kind of elastomer in processes for preparing adhesives, having an aqueous or solvent base, provides high cohesion to adhesive compositions without compromising or jeopardizing the adhesion. The present invention is also intended to protect the process for obtaining SBR copolymers, simultaneously comprising: aqueous emulsion polymerization at high temperatures, the use of a specific surfactant and the maintenance of the Mooney viscosity and the combined styrene content in the copolymer in high ranges.

Abstract: Described is an aqueous polymer dispersion comprising a chain growth addition polymer obtainable by free-radically initiated emulsion polymerization of ethylenically unsaturated, free-radically polymerizable monomers, wherein the polymerization of the monomers is effected in the presence of a certain molecular weight regulator composition. The molecular weight regulator composition comprises at least one mercaptoalkylcarboxylic ester of a C2- to C4-carboxylic acid and at least one oligomeric compound of the formula R1—X-(A-S—)n-A-Y—R2, where R1 and R2 are each H or CH3—(CH2)0-2—C(?O)—, X and Y are each an oxygen atom or a sulfur atom, A is a divalent C1- to C18-alkylene group and n is from 1 to 8. Also described is a process for preparing the aqueous polymer dispersion. The polymer dispersion is useful as a binder, an adhesive, a sizing agent for fibers, in the manufacture of coatings or in the manufacture of paper coating slips.

Abstract: Process for preparing an aqueous polymer dispersion with small polymer particles

Abstract: The present disclosure provides embodiments of polymeric particles, aqueous coating compositions, coating compositions, processes of making polymeric particles hydrophobic coatings, processes for making hydrophobic synthetic latex compositions, processes of forming polymeric particle agglomerates for use in a hydrophobic coating, and process of making hydrophobic polymeric binders. In some embodiments, the polymeric particle includes a polymer having an elastic modulus greater than about 108 Pascal (Pa), measured at 25 degrees Celsius (° C.) and at a deformation frequency of 1 radian per second, where the polymeric particle is hydrophobic, and where the hydrophobicity is achieved by polymerizing a monomer in a mixture comprising water and a fatty acid, or salt thereof, where the monomer contains less than about 3 parts acid monomer per 100 parts dry monomer.

Abstract: The invention provides a latex composition having a natural latex, a synthetic latex, a filler, and certain additives. A latex composition of the invention applied to a substrate allows the finished substrate to have improved wash durability. Fabrics and products comprising the latex composition are also provided. In particular, a rug manufactured from fabrics that have been coated with the latex composition may undergo at least 100 wash cycles without sustaining any significant structural deterioration, deterioration in softness and contact absorption, and/or substantial impairment to the functionality of the applied latex composition.

Abstract: A process for the production of aqueous binder latices by multistage emulsion polymerization in the aqueous phase, comprising the successive steps: 1) free-radical polymerization of a monomer mixture A comprising acidic monomers in a proportion corresponding to an acid value of 10 to 100 mg of KOH/g and olefinically polyunsaturated monomers in a proportion of 0.5 to 5 wt %, 2) neutralization of acid groups of the polymer formed in process step 1) and 3) free-radical polymerization of at least one monomer mixture B comprising acidic monomers in a proportion corresponding to an acid value of mixture(s) B of 0 to below 5 mg of KOH/g, hydroxyl-functional monomers in a proportion corresponding to a hydroxyl value of mixture(s) B of 0 to below 5 mg of KOH/g and olefinically polyunsaturated monomers in a proportion of 0.

Abstract: An emulsion polymerization process comprising polymerizing monomer in an emulsion in a reaction vessel at a first temperature to form a resin; cooling the reaction vessel to a second temperature that is above the softening point of the resin yet below the temperature required for significant depolymerization reaction to occur; and adding water to the cooled reaction vessel in an amount sufficient to effect phase inversion with mixing for a sufficient time to form an aqueous latex emulsion in the absence of a surfactant.

Abstract: A process for the preparation of monodisperse polymer particles which are formed by contacting monomers with aqueous dispersions comprising monodisperse swellable seed polymers/oligomers, and initiating polymerization in the presence of a steric stabilizer. The resulting swollen seed particles are characterized by the particle mode diameter.

Abstract: The present invention pertains to a process for the preparation of aqueous dispersions which are stabilised with a water-insoluble stabilising colloid, characterised in that a) in a first step a water-insoluble stabilising colloid is prepared, with this being prepared, based on the amount of monomer used for the preparation of the stabilising colloid, by means of radical polymerization of a1) about 1 to 90 wt. % of at least one olefinically unsaturated monomer, containing at least one sulfate and/or sulfonate group, which optionally may be protonated, a2) about 5 to 99 wt. % of at least one olefinically unsaturated monomer with a water solubility at 20° C. of less than 50 g/l, and a3) up to 50 wt. % of at least one olefinically unsaturated monomer with a water solubility at 20° C.

Abstract: Aqueous polymer dispersion having a solids content greater than 50% by weight, obtainable by emulsion polymerization of monomers in the presence of organic polymers (organic particles for short) which are dispersible in the aqueous phase without surface-active assistants.

Abstract: The invention relates to a process for microencapsulation of phase change materials based on free radicals polymerization comprising: a) the preparation of i) a solution with, at least, a hydrophilic liquid and a stabilizer (continuous phase) and ii) a solution with, at least, a phase change material, a free radical initiator and a polymerizable material (discontinuous phase); b) the preparation of an emulsion by dispersing the discontinuous phase in the continuous phase under vigorous stirring; and c) the polymerization of monomers until the phase change material becomes microencapsulated. This process is simple and effective and avoids the use of hazardous compounds. The invention also relates to microcapsules obtainable by said process and to the use thereof in the thermal protection and storage of heat.

Abstract: Disclosed is the use of nonionic surfactants as emulsifiers for emulsion polymerization, one or more nonionic surfactants being selected from the group consisting of (a) addition products of from 1 to 40 mol of ethylene oxide and/or propylene oxide per mole onto allyl alcohol, and (b) addition products of from 1 to 40 mol of ethylene oxide and/or propylene oxide per mole onto allyl alcohol, where the OH group of these addition products is terminally capped in the sense that it is replaced by a group OR, where R is an alkyl group having 1 to 20 carbon atoms which may be saturated or unsaturated, straight-chain or branched.

Abstract: Process of controlled free-radical polymerization in aqueous dispersion for the preparation of a block copolymer at least one block of which is a block of a halogenated polymer using molecular iodine and at least one oxidant whose solubility in water is at least 10 g/l for the synthesis of the first block of the block copolymer.

Abstract: The present invention provides an emulsion for vibration damping materials which stably exhibits excellent vibration damping property in a wide temperature range and exhibits excellent mechanical stability and which can be preferably used in various applications where a coating vibration damping material is used. The emulsion for vibration damping materials of the present invention is an emulsion for vibration damping materials, including an emulsion obtainable by emulsion polymerization of a monomer component, wherein the emulsion has a storage modulus value of 5.0×107 to 8.0×108 Pa at 20° C. and a storage modulus value of 1.0×105 to 5.0×106 Pa at 50° C., the emulsion has a loss modulus value of 4.0×107 to 4.0×108 Pa at 20° C. and a loss modulus value 1.0×105 to 7.0×106 Pa at 50° C., the emulsion has a maximum peak of a loss tangent of 1.3 or more in a range from 20 to 50° C., and a vibration damping composition including the emulsion has an aggregation ratio of 0.

Abstract: A photocurable pigment type inkjet ink composition including 5 to 95 wt % of water; 0.5 to 20 wt % of a pigment; 1 to 70 wt % of a photocurable component; and 0.0001 to 30 wt % of a reactive surfactant. The reactive surfactant can serve as a pigment dispersant for dispersing pigment particles or as an emulsifier for emulsifying the photocurable component.

Abstract: A pressure-sensitive adhesive comprising an aqueous polymer dispersion prepared by emulsion polymerization, wherein the polymer comprises monomers containing a hydroxyl group or primary amino group (referred to below collectively for short as hydrophilic monomers) and the polymer is obtainable by supplying more than 70% by weight of the hydrophilic monomers only when the polymerization mixture (mixture present in the polymerization vessel and composed of monomers and polymer already formed) already comprises more than 50% by weight of the total amount of monomers.

Abstract: Emulsions of hydrophobic monomers in water comprising inorganic particles as Pickering emulsifiers, and hydrophobin; and also the preparation and use of the emulsions are described.

Abstract: The present invention is directed to a process for synthesizing an epoxidized polymer that includes the steps of: (1) preparing a cationically stabilized polymer latex containing at least one conjugated diolefin monomer in a first stage, (2) treating the polymer latex from step (1) with formic or acetic acid and hydrogen peroxide, and (3) allowing the mixture to react for a predetermined time and predetermined temperature to attain the desired level of epoxidation.

Abstract: Silicone-containing addition polymers having numerous uses are prepared by polymerizing addition polymerizable monomers in the presence of a silicone-containing polyvinyl alcohol, and/or by adding a silicone-containing polyvinyl alcohol to an aqueous addition polymer dispersion prior to spray drying, the silicone-containing polyvinyl alcohol containing at least one polymerizable group.

Abstract: The invention relates to a simple, economical and reliable method for removing catalytic residues from polymer solutions. According to the inventive method, the copper content is reduced to a non-disturbing concentration level.

Abstract: A process for emulsion polymerizing one or more olefins involves reacting it/them with at least one complex compound of the formula Ia or b where M is a transition metal from groups 7 to 10 of the Periodic Table of the Elements and is preferably Ni in aqueous dispersion and at least one radical R1 to R3 and optionally one radical R4 to R9 contains a hydrophilic group X, selection being made from —SO3?, —O—PO32?, NH(R15)2+, N(R15)3+ or —(OCH2CH2)nOH, where n is an integer between 1 and 15. For the process of the invention it is optional to use an activator such as, for example, olefin complexes of rhodium or of nickel.

Abstract: A method has been disclosed of preparing ultrafine hydrophobic latex particles of polymers and copolymers by free radical emulsion polymerization in a water-based system, making use therefor, in order to polymerize or copolymerize monomers or monomer mixtures respectively, of at least one compound selected from the group consisting of dimers and cobalt complexes, acting as a chain transfer agent (CTA), wherein said latex particles have an average particle size of less than 100 nm, being more than 10% lower than if prepared in the absence of said CTA, characterized in that said polymerization is conducted in a water-based reaction in the presence of a chain transfer agent and of a surfactant, wherein said surfactant is present in a concentration versus said monomer or monomer mixture of from 5 up to 25% by weight for a non-ionic surfactant or from 0.05 up to 10% by weight for an ionic surfactant, more particularly a surfactant in a concentration below twice its critical micelle concentration.

Abstract: The present invention relates to styrene-butadienie latex, specifically a method of preparing latex for coating paper which shows excellent adhesion while maintaining printing property and comprised in a composition for coating paper. To achieve the object of the present invention, it provides a method of preparing styrene-butadiene latex comprising the step of emulsion polymerization by adding 0.1 to 10 parts by weight of chain transfer agent comprising; i) monofunctional thiol compound, and ii) polyfunctional thiol compound having at least two thiol groups based on 100 parts by weight of styrene-butadiene monomer composition. The latex prepared by the present method can easily control molecular weight and gel content, so that polymerization stability and mechanical stability are improved and thus, it is possible to print paper with high speed and to improve adhesion.

Abstract: The present invention generally provides a method for producing an exfoliated nanocomposite. The method involves charging to water, as the continuous phase, monomers, polymerizable surfactant, and water-soluble initiator. The monomers are allowed to polymerize under agitation to form an emulsion of polymers, and the polymerizable surfactant is bound to the polymers so formed, with an ionic end of the polymerizable surfactant extending from the polymers to provide surface charges. Thereafter, a suspension of nanofillers in water is charged to the emulsion. The nanofillers are oppositely charged from the ionic end of the polymerizable surfactant such that they electrostatically bind to the polymers within the emulsion. The water is subsequently decanted to produce a nanocomposite with an exfoliated structure.

Abstract: A polybutadiene latex is prepared by a process in which butadiene is polymerized by free radical emulsion polymerization in the presence of initiator and, if required, dispersants and further conventional assistants, the polymerization being carried out in the presence of reactive comonomers in such a way that the heat flow of 43 watt/kg solids content of the polymerization mixture is not exceeded. Owing to the presence of reactive comonomers, the reaction rate at the beginning of the reaction is increased, with the result that an overall flatter heat flow profile is obtained. A preferred reactive comonomer is styrene.

Abstract: Aqueous primary dispersions and coating materials comprising dispersed and/or emulsified, solid and/or liquid polymer particles and/or dispersed solid core-shell particles having a diameter?500 nm preparable by controlled free-radical microemulsion or miniemulsion polymerization of A) at least one olefinically unsaturated monomer and B) at least one olefinically unsaturated monomer which is different than the olefinically unsaturated monomer (A) and has the general formula I: R1R2C?CR3R4 (I), in which the radicals R1, R2, R3 and R4 independently of one another are hydrogen atoms or substituted or unsubstituted alkyl, cycloalkyl, alkylcycloalkyl, cycloalkylalkyl, aryl, alkylaryl, cycloalkylaryl, arylalkyl or arylcycloalkyl radicals, with the proviso that at least two of the variables R1, R2, R3 and R4 are substituted or unsubstituted aryl, arylalkyl or arylcycloalkyl radicals, especially substituted or unsubstituted aryl radicals; and also their use.

Abstract: A one-step direct method of making a high molecular weight functionalized polyolefin aqueous emulsion is provided. In this one-step direct method, a functionalized polyolefin having a molecular weight of at least 10,000, a fatty acid, a base, a surfactant, and water are heated in a pressure reaction vessel to a temperature above the emulsification temperature of the polyolefin with agitation for a period of time sufficient to form an aqueous emulsion. This high molecular weight functionalized polyolefin aqueous emulsion can be added to a sizing composition and applied directly onto glass fibers in the glass fiber manufacturing process.

Abstract: A one-step direct method of making a high molecular weight functionalized polyolefin aqueous emulsion is provided. In this one-step direct method, a functionalized polyolefin having a molecular weight of at least 10,000, a fatty acid, a base, a surfactant, and water are heated in a pressure reaction vessel to a temperature above the emulsification temperature of the polyolefin with agitation for a period of time sufficient to form an aqueous emulsion. This high molecular weight functionalized polyolefin aqueous emulsion can be added to a sizing composition and applied directly onto glass fibers in the glass fiber manufacturing process.

Abstract: The invention concerns a novel method for preparing latex by emulsion (co)polymerization of ethylenically unsaturated monomers, wherein the direct inline monitoring is carried out by Raman spectroscopy. The invention also concerns latex compositions obtainable by the emulsion (co) ploymerization method whereof the direct inline monitoring is performed by Raman spectroscopy. The invention further concerns a device for implementing said method, said device comprising a reactor, at least an optical probe, a Raman spectrometer, optical fibers, a computer and a regulating automaton.

Abstract: Process for the production of aqueous polymer dispersions by reaction of one or more olefinically unsaturated compounds in aqueous medium in the presence of a complex compound which possesses the structural element Y—M—E, E standing for nitrogen, M for a transition metal of groups 7 to 10 of the periodic system of the elements and Y for oxygen, sulfur, nitrogen or phosphorus, and which possesses no hydrophilic groups in its ligand system.

Abstract: An aqueous composition that includes (A) a butadiene polymer latex that is prepared by an emulsion polymerization in the presence of a styrene sulfonate stabilizer and (B) a phenolic resin. A preferred aqueous butadiene polymer latex is one that is prepared by emulsion polymerization of at least 60 weight percent dichlorobutadiene monomer (based on the amount of total monomers used to form the butadiene polymer), in the presence of a styrene sulfonate stabilizer.

Abstract: A composition and method that provides a chemically grafted coating onto a substrate. The composition comprises an acrylate and a grafting initiator. The acrylate may be a waterborne urethane acrylate. The composition may also comprise resistance agents, adhesion agents, UV curing photoinitiators, defoaming agent, and/or deglossing agents. The substrate may be any wood or plastic, but works well with heat shrinkable polyolefin tubing. The composition may also be quick curing such that the coating from the composition may be cured under a D bulb and an H bulb at a rate of 100-160 feet/minute. The coating on the substrate resists delamination and wear. The coating may have indicia printed on the coating, the indicia being composed from ink or other printable materials.

Abstract: A polystyrene seed latex composition is provided having a total emulsion polymer content of from 0.2 to 2.0 weight percent and a particle diameter less than 150 Å. The seed latex is produced on a continuous basis by feeding to a continuous stirred reactor an emulsion stream and initiator stream. The feed streams are mixed in the stirred reactor at room temperature to produce the seed latex. Preferably, the initiator stream comprises a sodium formaldehyde sulfoxylate reducing agent. The amount of initiator charged into the continuous seed reactor is sufficient to complete both the seed and a subsequent continuous latex polymerization reaction.

Abstract: This invention pertains to radiation-curable aqueous compositions comprising a mixture of water-reducible oligomer, monomer, and water-insoluble cationically-modified latex. More particularly, the invention pertains to radiation-curable aqueous compositions that are suitable for use as ink jet printing receptive coatings and in the production of ink jet printable products.

Abstract: The invention concerns a method for polymerising at least one olefin in the presence of at least a catalyst comprising a sequence E—M—X wherein E represents an oxygen or sulphur atom; M represents a nickel or palladium or platinum atom; X represents a phosphorus, arsenic or antimony atom in a medium comprising a continuous liquid phase containing more than 30 wt. % of water. The method can result in a polymer latex of at least one olefin.

Abstract: The invention relates to a method for producing caoutchouc particles (K) by means of emulsion polymerisation in the presence of an emulsifier and a polymerisation initiator. Said particles contain A) 80 to 100 wt. % of one or more conjugated diene monomers (A) in relation to (K) and B) 0 to 20 wt. % of one or more monoethylenically unsaturated comonomers (B) in relation to (K) in the polymerised form. The inventive method is characterised in that 1) a mixture (M1) containing water and an emulsifier is provided, 2) a mixture (M2) containing one or more monomers in the monomer or polymerised form selected from styrole, &agr;-methylstyrole, butadiene, n-butylacrylate, MMA and acrylnitrile and optionally comonomers is added, 3) polymerisation of the obtained mixture starts in the presence of a polymerisation initiator at temperature of 5 to 95° C., 4) a mixture (M3) containing 0 to 100 wt. % of the comonomers (B) in relation to (B) and 0 to 25 wt.

Abstract: Aqueous primary dispersion, substantially or completely devoid of volatile organic substances, method for the production thereof and use of the same Aqueous primary dispersion, substantially or entirely free of volatile organic compounds, and comprising dispersed and/or emulsified, solid and/or liquid polymer particles and/or dispersed solid core/shell particles with a particle diameter ≦500 nm, preparable by free-radical micro- or miniemulsion polymerization of at least one olefinically unsaturated monomer in the presence of at least one hydrophobic additive and of at least one oligomeric polyester with a number-average molecular weight of from 150 to 1 500 daltons, a hydroxyl number of from 100 to 1 000 mg KOH/g, and an acid number <20 mg KOH/g and also a process for preparing it and its use as a coating material, adhesive or sealing compound or to prepare a coating material, an adhesive or a sealing compound.

Abstract: The present invention relates to a process for hydrogenating ethylenically unsaturated double bonds in polymers P by reacting an aqueous dispersion of at least one polymer P with hydrogen in the presence of at least one hydrogenation catalyst comprising at least one transition metal selected from rhodium and/or ruthenium and at least one nonionic phosphorus compound capable of forming a coordinative compound with the transition metal, which comprises incorporating the hydrogenation catalyst into the aqueous dispersion of the polymer P without adding a solvent. The present invention also relates to the aqueous dispersions of the hydrogenated polymers P obtainable by this process and to coating compositions comprising such dispersions.