Abstract: A water and oil repellant comprising, as effective component, polymer particles each containing at least two polymers, wherein at least one of said at least two polymers is a polymer containing a polyfluoroalkyl group.

Abstract: A core/shell polymer is capable of increasing a composition's whiteness of opacity. The shell polymer has either a crystalline structure of a T.sub.g of at least about 50.degree. C. The shell polymer comprises (i) at least one nonionic monomer selected from the group consisting of soft alkyl acrylate monomers, soft methacrylate ester monomers, and mixtures thereof, and (ii) at least one additional nonionic monomer. The core has a different composition than the composition of the shell and a T.sub.g of at least about 50.degree. C. The core comprises alkenyl aromatic monomers. The core and shell polymers are homopolymers or copolymers.

Abstract: Dispersions of core-shell polymers in caprolactam solutions of telechelic polymers capable of being polymerized to form rubber-modified nylon-6 block copolymers having improved impact strength wherein the core-shell polymer comprises a crosslinked elastomer core and a hard thermoplastic polymer shell and wherein the telechelic polymers preformed or formed in situ, are capped with lactam polymerization initiator groups.

Abstract: Modifier compositions of acrylic core/shell polymers and alkyl methacrylate-butadiene-styrene core/shell polymers are added to polyvinyl halides to provide materials with improved color depth and impact strength, as well as reduced pearlescence.

Abstract: The invention relates to a mixture composed of polyoxymethylene (component A), a rubber-elastic graft copolymer in which the particles have been formed from a rubber-elastic, single-phase core based on polydiene and a hard graft shell (component B) and a polymeric third component (component C).The invention also relates to a three-component mixture of the components A, B' and C, the core, in the case of B' being preponderantly or entirely composed of poly(meth)acrylic acid ester or silicone rubber instead of polydiene.The shaped articles produced from these mixtures are particularly distinguished by good low-temperature impact strength.

Abstract: Polymer particles or beads for use as opacifiers in paints are described in which a core is provided with a hard sheath and the particle has one or more voids produced by reaction with a non-volatile permanent or fixed base. The sheath is a coploymer of an ethylenically unsaturated aliphatic monomer free of acid groups and at least 2 percent by weight of a soft ester-containing monomer and optionally styrene in an amount of up to 25 mole percent. The core is formed from an ethylenically unsaturated monomer with acid functionality.The sheath polymer has a glass transition temperature of at least 40.degree. C. The particles have a size of up to 40000 nanometers before swelling the core by some 150 to 2000 percent.

Abstract: These polymers are copolymers or overpolymers having a substrate of styrene butadiene copolymer overpolymerized with an amine substituted alkyl acrylate. The polymers promote adhesion between organic and inorganic substrates and unsaturated polymers.

Abstract: An aqueous dispersion comprising composite colloidal particles having an average particle size of 0.05 to 1.0 micrometer each of which comprises a core made of a copolymer comprising 99-100% by weight of tetrafluoroethylene and 0 to 1 % by weight of a fluorine-containing olefin which is copolymerizable with tetrafluoroethylene and a shell made of a polymer having a glass transition temperature of at least 50.degree. C. which comprises(a) 60 to 100% by mole of at least one .alpha.-substituted acrylate of the formula:CH.sub.2 .dbd.CXCOOR.sub.f (I)wherein X is a methyl group, a fluorine atom or a trifluoromethyl group, and R.sub.

Abstract: Binder, coating, and adhesive compositions having surprising film build, flow, leveling, and adhesive wet tack are provided by an aqueous dispersion comprising polymer particles having a central core surrounded by lobes. Also disclosed are the uses and process of preparation of these unique particles.

Abstract: A method for altering a macroporous cross-linked hydrophobic copolymeric lattice produced by precipitation polymerization in a solvent of at least one monounsaturated ester monomer and at least one polyunsaturated ester monomer soluble therein, in order to render the hydrophobic copolymeric lattice hydrophilic. The method involves saponifying the hydrophobic copolymeric lattice by reacting the surface of the hydrophobic copolymeric lattice with an aqueous alkali. The surface can also be rendered hydrophilic by polymerizing an acrylate monomer onto the lattice in order to form a surface containing carboxylic acid sites. The carboxylic acid sites formed on the surface of the lattice are converted to carboxylate anions.

Abstract: A core/shell polymer is capable of increasing a composition's whiteness or opacity. The core and shell polymers have either a crystalline structure or have a T.sub.g of at least about 50.degree. C. The core polymer has a different composition than the composition of the shell polymer. The core polymer comprises vinylidene halide monomers and/or vinyl halide monomers. The core and shell polymers are either homopolymers or copolymers.

Abstract: Polycarbonate and polyester blends are prepared with a combination of modifiers comprising a multi-stage polyorganosiloxane-based graft polymer composition and a diene rubber-based graft polymer composition imparting a wide range of excellent physical properties on the PC and PE blends.

Abstract: A polymer mixture having a lower ductile/brittle fracture transition temperature is obtained by adding a dialkyl silicone fluid polymer to a polymer mixture which comprises an aromatic polycarbonate and two agents to improve the impact strength.

Abstract: The inventive vehicle, or binder, for water based gloss paints contains, dispersed in a aqueous phase, particles of a multiphase emulsion polymer made up of(a) core material having a glass transition temperature exceeding 40.degree. C. and(b) a shell material having a glass transition temperature of less than 70.degree. C. and at least 20 K. below that of the core material.The particles have an average diameter of less than 200 nm. The composition of the shell material includes an emulsion polymer with at least 4 percent by weight of an ethylenically unsaturated carboxylic acid and more than 80 percent by weight of one or more monomers from the group consisting of styrene and alkyl esters of acrylic and/or methacrylic acid. Paint coats produced with this vehicle are distinguished by a high blocking point.

Abstract: Improved polymeric optical fibers comprising a core of a copolymer prepared by anionic polymerization of alpha-methylstyrene and a monovinylidene aromatic comonomer at a temperature above 61.degree. C. and a cladding polymer are disclosed. The fibers have superior combination of high heat resistance, high flexibility, and low transmission loss in bent form.

Abstract: A semi-continuous, multi-stage polymerization process is provided for synthesizing a heat-sealable multi-layered composite particle latex. The multi-layered composite latex particles of this invention provide excellent oxygen and vapor barrier properties without hindering the desired surface properties, including high heat-sealing strength, low minimal seal temperature, excellent machinability, i.e. low blocking and low coefficient of friction. The latex particles of the present invention are formed as three-layered composite particles having an acrylic ester seed layer composed of a copolymer of methyl methacrylate and methyl acrylate. The latex particles have an intermediate core layer composed of a terpolymer having a high vinylidene chloride concentration, the other comonomers of the core layer include methyl acrylate and methacrylic acid.

Abstract: A water-insoluble polymeric particle has an inner core comprising a detectable tracer material distributed in a first polymer for which the tracer material has a high affinity. This first polymer has a glass transition temperature (Tg.sub.1) less than about 100.degree. C. The particle also has an outer shell comprising a second polymer for which the tracer material has substantially less affinity relative to said first polymer. This second polymer has a glass transition temperature (Tg.sub.2) which is greater than or equal to the term [Tg.sub.1 -10.degree. C.]. It also contains groups which are either reactive with free amino or sulfhydryl groups of an immunoreactive species or which can be activated for reaction with such groups. Such a species can be covalently attached to this particle to form an immunoreactive reagent which is useful in analytical elements and various analytical methods including immunological methods, for example, agglutination assays.

Abstract: Polymer particles or beads for use as opacifiers in paints are described in which a core is provided with a hard sheath and the particle has one or more voids produced by reaction with a nonvolatile permanent or fixed base. The sheath is a copolymer of an ethylenically unsaturated aliphatic monomer free of acid groups and at least 2 percent by weight of a soft ester-containing monomer and optionally styrene in an amount of up to 25 mole percent. The core is formed from an ethylenically unsaturated monomer with acid functionality.The sheath polymer has a glass transition temperature of at least 40.degree. C. The particles have a size of up to 40000 nanometers before swelling the core by some 150 to 2000 percent.

Abstract: The present invention relates to a sequential polymerization process for preparing a water-insoluble dispersion of core/shell particles. In one embodiment the process may be employed to produce a particulate dispersion useful in making water-based coating compositions wherein on drying the particulate dispersion serves as an opacifying agent. In another embodiment the process may be employed to microencapsulate a hydrophobic target material, such as a biocide or herbicide.

Abstract: A two component polyurethane coating consisting of a principal component (A) comprising a hydroxyl group containing film-forming resin, crosslinked polymer particles and a solvent for said film-forming resin and a hardener component (B) comprising a polyisocyanate compound, which is characterized by using as the crosslinked polymer particles composite resin particles each comprising a particulate crosslinked polymer core and a number of substantially linear polymer chains coupled with said core by either chemical bonding, semi-interpenetration or both, and containing metal element in either portion of said core, said polymer chains or both of them; the solid weight ratio of said hydroxyl group containing film-forming resin to said composite resin particles being 99/1 to 40/60 and the equivalent ratio of isocyanate groups in the hardener component (B) to hydroxyl groups in the principal component (A) (if the linear polymer chains contain hydroxyl groups, the sum of said hydroxyl groups and those of the film-fo

Abstract: Hollow polymer particles having at least two polymer layers, wherein (1) the particles have an average particle diameter in the range of 0.15 to 20 micrometers, (2) each of the particles has an average equivalent hollow diameter/equivalent particle diameter in the range of 0.2 to 0.8, (3) the proportion of a toluene-insoluble portion of the particles is 20 to 90% by weight, (4) the polymer particles have a melt flow rate at 180.degree. C. under 10 kgf/cm.sup.2 of 0.1 to 1 g/10 min., (5) the inside layer of the two polymer layers is composed of a crosslinked polymer and (6) the outside layer of the two polymer layers is composd of a non-crosslinked polymer. This invention also provides hollow crosslinked polymer particles wherein the proportion of a toluene-insoluble portion of the particles exceeds 85% by weight, the melt flow rate of the polymer particles at 180.degree. C. under 10 kgf/cm.sup.2 is less than 0.2 g/10 min., and the outside layer is composed of a crosslinked polymer.

Abstract: Multi-stage polymer particles containing one or more void space(s) therein are produced by sequential emulsion polymerization of an essentially low-acid earlier polymer stage, encapsulation of said low-acid polymer stage with at least a final polymer stage, contacting said polymer particles with a non-polymeric carboxylic acid or anhydride to permit the acid or anhydride to be absorbed into said low-acid polymer stage and swelling the polymer particles by contacting the particles with an aqueous base. The low-acid polymer stage is formed by emulsion polymerizing a monomer system comprising ethylenically unsaturated monomer(s) and containing less than 5% by weight of monomer(s) containing acid functionality. The low-acid polymer stage is swubsequently encapsulated by one or more polymer stages by emulsion polymerizing ethylenically unsaturated monomer(s) in the presence of the low-acid polymer stage. The final stage has a glass transition temperature (Tg) of about 50.degree. C.

Abstract: The invention relates to thermoplastic polyamide moulding compositions with improved toughness at low temperatures consisting of at least 60% by weight of polyamide and from 3 to 35% by weight of graft rubbers from the group comprising diene rubbers and acrylate rubbers, which are produced in that a mixture of the two components is produced in the presence of from 0.01 to 5% by weight of a radical forming agent and the moulding compositions are then heated below the polyamide melting point as far as possible in the absence of oxygen.

Abstract: A polycarbonate resin composition which comprises:50-80% by weight of a polycarbonate resin,20-45% by weight of a poly(1,4-butylene terephthalate) resin and5-30% by weight of an impact modifier, based on the resin composition, respectively,the impact modifier being a core-shell polymer comprising a core composed of a cross-linked rubbery polymer of an alkyl acrylate wherein the alkyl has 2-8 carbons and a shell composed of a homopolymer or a copolymer of methyl methacrylate which has a glass transition temperature of not less than 60.degree. C., and the core-shell polymer having an acetone soluble fraction of not more than 3% by weight based on the core-shell polymer.

Abstract: A semi-continuous, multi-stage polymerization process is provided for synthesizing a heat-sealable multi-layered composite particle latex. The multi-layered composite latex particles of this invention provide excellent oxygen and vapor barrier properties without hindering the desired surface properties, including high heat-sealing strength, low minimal seal temperature, excellent machinability, i.e. low blocking and low coefficient of friction. The latex particles of the present invention are formed as three-layered composite particles having an acrylic ester seed layer composed of a copolymer of methyl methacrylate and methyl acrylate. The latex particles have an intermediate core layer composed of a terpolymer having a high vinylidene chloride concentration, the other comonomers of the core layer include methyl acrylate and methacrylic acid.

Abstract: Dispersion-process-produced, non-melt-processible, particulate, core-shell, tetrafluoroethylene copolymer comprising recurring units of tetrafluoroethylene and modifying recurring units of at least one ethylenically unsaturated comonomer that is copolymerizable with the tetrafluoroethylene, the number of recurring units of comonomer in the shell being sufficient to enable the copolymer to compound uniformly with an elastomer or plastic without forming visible agglomerates, and blends thereof with elastomeric and plastic resins.

Abstract: Laminating adhesives are described for forming flexible laminates having high bond strength, and a high degree of both humidity and water resistance. The one-part laminating adhesive compositions incorporate acrylic polymer emulsions prepared by a "core-shell" multistage polymerization process.

Abstract: Adhesive compositions are made from methacrylate ester monomers, elastomeric polymers having a Tg below -25.degree. C. and which are soluble in the monomers, core-shell polymers which swell in the monomers but do not dissolve therein, and free radical producing catalysts. These adhesive compositions when used in bonded assemblies exhibit a combination of high adhesive bond impact strength and high bulk tensile elongation.

Abstract: An aqueous emulsion-type pressure sensitive adhesive characterized in that the aqueous emulsion is prepared by(i) a first step of emulsion polymerizing an ethylenically unsaturated monomer composed essentially of at least one type of styrene, alpha-methylstyrene, acrylonitrile, methyl methacrylate and vinyltoluene in the presence of an emulsion composed of at least one tackifier resin selected from a rosin ester, a petroleum resin and a terpene resin to form an aqueous emulsion containing particles of a two-layered structure having a core layer of the tackifier resin and a layer of a polymer (polymer A.sub.

Abstract: Swollen core/sheath polymeric particles are disclosed having one or more voids in the core formed by reaction with a base such as sodium hydroxide. The sheath contains styrene or similar monomer polymerized in an amount greater than 25 mole percent and the polymer is free of acid groups. The core contains acid groups. Swelling is effected at an elevated temperature and in the absence of an organic solvent.The swollen particles on drying in a paint or other composition have air in the voids and act then as opacifying agents.

Abstract: Disclosed herein are core-shell polymers having an alkali-insoluble, emulsion polymer core and an alkali-soluble, emulsion polymer shell attached or associated with said core so that upon dissolving said shell with alkali, a portion of said shell remains attached or associated with said core. Also disclosed are compositions wherein said shell polymer has been neutralized and substantially, but not totally, dissolved so as to form a blend of neutralized core-shell polymer and an aqueous solution of neutralized shell polymer.

Abstract: Disclosed is a graft copolymer resin prepared by graft polymerizing a vinyl compound onto a composite-structured acrylic rubber whose particles are composed of a core consisting of a diene rubber enlarged by treatment with an acid group-containing copolymer latex, and an outer layer consisting of an acrylate polymer having a crosslinked structure formed by the combined use of a graft-linking agent and a cross-linking agent. This graft copolymer resin may be blended with a rigid thermoplastic resin in a specific proportion. This resin composition imparts a good gloss to the molded articles formed therefrom, while retaining excellent impact resistance and weather resistance.

Abstract: Dispersion-process-produced, non-melt-processible, particulate, core-shell, tetrafluoroethylene copolymer comprising recurring units of tetrafluoroethylene and modifying recurring units of at least one ethylenically unsaturated comonomer that is copolymerizable with the tetrafluoroethylene, the number of recurring units of comonomer in the shell being sufficient to enable the copolymer to compound uniformly with an elastomer or plastic without forming visible agglomerates, and blends thereof with elastomeric and plastic resins.

Abstract: A method for altering a macroporous cross-linked hydrophobic copolymeric lattice produced by precipitation polymerization in a solvent of at least one monounsaturated ester monomer and at least one polyunsaturated ester monomer soluble therein, in order to render the hydrophobic copolymeric lattice hydrophilic. The method involves saponifying the hydrophobic copolymeric lattice by reacting the surface of the hydrophobic copolymeric lattice with an aqueous alkali. The surface can also be rendered hydrophilic by polymerizing an acrylate monomer onto the lattice in order to form a surface containing carboxylic acid sites. The carboxylic acid sites formed on the surface of the lattice are converted to carboxylate anions.

Abstract: A multilayer interpolymer material of an elastomeric inner phase polymerized from (a) 50-99.9 parts of at least one among: conjugated dienes and alkyl and aralkyl acrylates, (b) 0-49.9 parts of at least one copolymerizable monomer, (c) 0.05-8 parts of at least one crosslinking monomer, and (d) 0.05-6 parts of at least one grafting monomer, and a nonelastomeric outer phase, polymerized from (a) 50-99.9 parts by weight of at least one among: alkyl methacrylates, vinyl aromatic hydrocarbons and unsaturated nitriles, (b) 0.1-50 parts of at least one copolymerizable monomer, and (c) 0-5 parts of at least one chain-limiting agent, the parts being given by weight, it being possible for the said polymer to comprise a nonelastomeric or else elastomeric core phase without grafting and crosslinking monomers. Two populations of particles of mean diameter of approximately 40-150 nm and approximately 160-500 nm respectively are mixed in given ratios. This improves the impact strength of the resultant matrices.

Abstract: Improved processes for the removal from solution of multi-valent alkaline earth metal and/or heavy metal cations are taught, having excellent combinations of cation capacity and resistance to bead breakage. The processes use specified polymer resin beads functionalized with chelating functionalities such as alkylaminophosphonic moieties or iminodiacetic acid moieties. The beads are prepared by the specified process to have a decreased amount of cross-linking in the shell area as compared to the core. An additional aspect of the invention is an improved gel-type chelating resin having core/shell morphology and alkylaminophosphonic functional groups which is found to exhibit surprising combinations of dynamic capacity, osmotic shock resistance, and physical strength. This chelating resin has been found to be very suitable for the removal of calcium from brine solutions prior to the use of such solutions in membrane electrolysis cells of chlorine production.

Abstract: A low gloss thermoplastic with good physical properties consists of a blend of ASA and a gloss-reducing amount of a glycidyl (meth)acrylate copolymer.

Abstract: Light-stabilized polymer microparticles, which contain at least one light stabilizer and free epoxy groups, and processes for the preparation of these microparticles by polymerization of suitable monomers, at least one of these monomers being an epoxide which contains at least one further reactive group, and at least part of the polymerization being carried out in the presence of at least one light stabilizer, are described. The polymer microparticles can be used in coating compositions which comprise a disperse phase, containing these particles, and a liquid continuous phase.Coatings and paints based on the compositions according to the invention are distinguished by improved weathering resistance, in particular high light stability.

Abstract: Polymer opaque particles and a process for making same are disclosed. These particles comprise an emulsion polymerized core copolymer having, as one constituent thereof, between about 15% and about 40% by weight of a monomer having the general formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.4 are independently selected from hydrogen, nitro, amino nitrile, hydroxyl and halogen groups, and organic radicals such as substituted or unsubstituted alkyl, cycloalkyl or aryl groups, R.sub.3 is selected from hydrogen or substituted or unsubstituted organic radicals such as alkyl, cycloalkyl or aryl groups and A is an organic or inorganic bridge connecting the illustrated atoms, the remainder being a mixture of selected olefinically unsaturated acid and ester monomers, said core particles, in turn being encapsulated with an emulsion polymerized sheath copolymer comprised of one or more nonionic olefinically unsaturated monomers to produce said opaque particles.

Abstract: Dispersions of core-shell polymers in caprolactam solutions of telechelic polymers capable of being polymerized to form rubber-modified nylon-6 block copolymers having improved impact strength wherein the core-shell polymer comprises a cross-linked elastomer core and a hard thermoplastic polymer shell and wherein the telechelic polymers preformed or formed in situ, are capped with lactam polymerization initiator groups.

Abstract: Thermoplastic compositions comprising rubber modified polyalkenyl aromatic resin and a modifying agent having a core-shell structure comprised of an interpenetrating, cross-linked (meth)acrylate core and a cross-linked styrenic resin shell have significantly improved impact strength, thermal resistance and surface appearance following molding into shaped articles.

Abstract: Multi-stage polymer particles containing one or more void space(s) therein are produced by sequential emulsion polymerization of an essentially low-acid earlier polymer stage, encapsulation of said low-acid polymer stage with at least a final polymer stage, contacting said polymer particles with a non-polymeric carboxylic acid to permit the acid to be absorbed into said low-acid polymer stage and swelling the polymer particles by contacting the particles with an aqueous base. The low-acid polymer stage is formed by emulsion polymerizing a monomer system comprising ethylenically unsaturated monomer(s) and containing less than 5% by weight of monomer(s) containing acid functionality. The low-acid polymer stage is subsequently encapsulated by one or more polymer stages by emulsion polymerizing ethylenically unsaturated monomer(s) in the presence of the low-acid polymer stage. The final stage has a glass transition temperature (Tg) of about 50.degree. C.

Abstract: New modified non-melt-fabricable polytetrafluoroethylene resins have now been found which can be compounded with elastomers or plastics without the deleterious agglomeration or fibrillation that occurs with known modified non-melt-fabricable polytetrafluoroethylene resins. The resins are made of recurring units of tetrafluoroethylene, and recurring units of at least one comonomer selected from hexafluoropropylene or perfluoro (alkyl vinyl ether) wherein the alkyl group is of 1-4 carbon atoms, said comonomer present in amounts sufficient to produce the effect recited in the first sentence.

Abstract: Overpolymer acrylate rubbers comprising a rubbery alkyl acrylate polymer, an overcoat of a cross-linked and grafted polymer having a Tg value of over about 20.degree. C. and a second overcoat of a grafted but uncross-linked polymer having a Tg value of over about 20.degree. C. provide an exceptional balance of properties when blended to prepare weatherable impact modified thermoplastic molding resins.

Abstract: Improved core-shell polymers having an alkali-insoluble core and an alkali-soluble shell are prepared by emulsion polymerization of the core-shell polymers utilizing compounds which chemically graft the core and shell together. The core-shell polymers exhibit improved solvent stability, water resistance, heat resistance and rheology. The polymers are useful in application such as inks, coatings and varnishes, floor polishes, leather treatment, cement formulations, and as a seed for further emulsion polymerization.

Abstract: Thermoplastic particulate graft polymers comprising particles of a core (A) of an organic resin-like polymer of olefinically unsaturated monomers having softening temperatures (glass temperatures) above 30.degree. C., a shell polymer (B) or ogranopolysiloxane and a polymer (C) of at least one .alpha.,.beta.-unsaturated olefinic monomer grafted onto the particles consisting of A and B and their use as thermoplastic molding compositions.

Abstract: This invention provides hardenable compositions useful as construction media for a wide range of applications. Particular utility is found in the dental and medical arts where such compositions are highly suitable for the formation and construction of denture base, denture baseplates, denture liners, denture repair, custom trays, veneering for crowns and bridgework, artificial teeth, veneers and repair for natural teeth, and tooth restorative fillings. Such materials having improved impact strengths and elastic moduli when hardened are disclosed which include rubber-modified polymer.

Abstract: Swollen core/sheath polymeric particles are disclosed having one or more voids in the core formed by reaction with a base such as sodium hydroxide. The sheath contains styrene or similar monomer polymerized in an amount greater than 25 mole percent and the polymer is free of acid groups. The core contains acid groups. Swelling is effected at an elevated temperature and in the absence of an organic solvent.The swollen particles on drying in a paint or other composition have air in the voids and act then as opacifying agents.

Abstract: Particulate, multiphase polymers which have a core (A) and an overlying shell (B) wherein the core (A) is an organic, resinous polymer comprising polymerized olefinically unsaturated monomer units having softening point temperatures of at least 30.degree. C. and wherein the shell (B) is an organopolysiloxane are obtained by producing in a first stage an organic resinous polymer in latex form by emulsion polymerization and, in a second stage, the latex particles of the first stage are surrounded with a shell (B) organopolysiloxane by polymerizing low molecular weight organosiloxanes in the presence of the latex particles of the first stage.

Abstract: Particulate, multiphase polymers which have a core (A) and an overlying shell (B) wherein the core (A) is an organic, rubber-like polymer comprising polymerized olefinically unsaturated monomer units having softening point temperatures below 0.degree. C. and wherein the shell (B) is an organopolysiloxane are obtained by producing in a first stage an organic rubber-like polymer in latex form by emulsion polymerization and, in a second stage, the latex particles of the first stage are surrounded with a shell (B) or organopolysiloxane by polymerizing low molecular weight organosiloxanes in the presence of the latex particles of the first stage.