Abstract: A reinforcing agent for vulcanizable rubber compounds comprises an anhydrous metal salt of an .alpha.,.beta.-ethylenically unsaturated carboxylic acid having a crystalline structure consisting essentially of plates and fibers. Vulcanizable rubber compounds containing such reinforcing agents have improved physical properties over rubber compounds containing conventional metal carboxylic acid salts. Methods for the preparation of such anhydrous metal salts and methods for the reinforcement of vulcanizable rubber compounds therewith are also provided.

Abstract: Superabsorbents made by the process of electron beam initiated polymerization of partially neutralized acrylic acid having improved absorbencies when a trivalent cationic salt, for example, Aluminum Acetate or a tetravalent cationic salt, for example, Platinum Tetrachloride, are added to the partially neutralized acrylic acid solution before polymerization is initiated.

Abstract: A novel catalyst system, a process for using the novel catalyst system, and a product made from the process is described. The novel catalyst system is specific for producing polyethylene terephthalate made from reacting terephthalic acid and ethylene glycol, wherein the catalyst system includes at least 650 ppm antimony; cobalt and/or zinc, and at least one of zinc, magnesium, manganese or calcium. The antimony is generally present from about 650 ppm to about 1100 ppm. The cobalt and/or zinc is usually present from about 15 ppm to about 60 ppm, and the zinc, magnesium, manganese or calcium, as the third component, is generally present from about 10 ppm to about 150 ppm. The amounts of all catalyst components are based on the theoretical yield of the polymer. Using the novel catalyst system to produce PET drastically increases the polymerization rate. In the process, the novel catalyst system can be introduced any time before the polycondensation stage of the manufacturing process.

Abstract: Aqueous silicone dispersions crosslinkable into elastomeric state upon removal of water therefrom, well adapted for the production of paints and silicone elastomer seals, e.g., for the construction industry, include:(A) 100 parts by weight of an oil-in-water emulsion of an .alpha.,.omega.-(dihydroxy)polydiorganosiloxane, stabilized with an anionic and/or nonionic surfactant;(B) 0.1 to 20 parts by weight of an aminosilane and/or amidosilane;(C) 0 to 3 parts by weight of a metal curing catalyst; and(D) 0 to 250 parts by weight of a non-siliceous inorganic filler, such emulsion having a pH of from 7 to 13 and a dry solids content of at least 40%.

Abstract: There is described a process for the production of pigment/plastic premixes characterized by homogeneous distribution of pigment in a polymer matrix. The invention is based on the polymerization of olefins carried out by means of a process using Ziegler catalyst. Significantly the polymerization occurs on the surface of the pigment particles, after the prior activation of the pigment particles.

Abstract: A curable silicon composition comprising:(A) an organopolysiloxane containing at least two silicon-bonded unsaturated aliphatic hydrocarbon groups and having a viscosity of from 100 to 200,000 cSt at 25.degree. C.,(B) a vinyl group-containing organocyclopolysiloxane having the general formula (I): ##STR1## wherein R represents a hydrocarbon group having from 1 to 6 carbon atoms excluding unsaturated aliphatic hydrocarbon groups, and n represents an integer of from 3 to 8,(C) an organohydrogenpolysiloxane containing at least two silicon-bonded hydrogen atoms in the molecule,(D) a platinum family metal catalyst, and(E) a triazole compound.This curable silicone composition has good curing properties and can produce cured products having a markedly small permanent compression set.

Abstract: A method for incorporating metal salts of .alpha.,.beta.-ethylenically unsaturated carboxylic acids into polymers and improving the cured physical properties of vulcanizable rubber compositions based on such polymers. The method includes the steps of preparing a polymer cement in a suitable organic solvent, forming a suspension of the metal salt of an .alpha.,.beta.-ethylenically unsaturated carboxylic acid in a suitable aliphatic hydrocarbon solvent miscible with the organic solvent, mixing the polymer cement and the suspension together and thereafter removing the solvents to provide the metal salt uniformly dispersed within the polymer.

Abstract: Processes for the preparation of polymers which comprises a suspension free radical polymerization of a monomer phase comprised of at least two monomers, and a polymerization initiator; and an aqueous phase comprised of water and magnetite.

Abstract: The curable resin composition of the present invention consists of a curable resin having uniformly dispersed therein particles of a cured silicone rubber obtained from an organosiloxane composition curable by a platinum-catalyzed hydrosilation reaction, wherein said organosiloxane composition contains reaction products of an ethylenically unsaturated epoxy compound and an ethylenically unsaturated aromatic compound with the organohydrogenpolysiloxane present in said organosiloxane composition. Either or both of the epoxy compound and the aromatic compound can be prereacted with a portion of the silicon-bonded hydrogen atoms of the organohydrogenpolysiloxane.

Abstract: Disclosed is a magnet which is composed mainly of magnetic powders expressed by R-T-B (R is Nd or that partially replaced with rare earth elements and T is Fe or that partially replaced with transition metal.) and a chelate resin or a chelate resin in admixture with other synthetic resins. The magnetic has markedly improved resistance to deterioration caused by oxidation and corrosion.

Abstract: A room temperature curing composition comprising:(A) a silanol-terminated polydiorganosiloxane;(B) a hydrolyzable silyl-terminated polymer obtained by reacting:(a) an epoxy-terminated polyether;(b)(i) an heterocyclic compound containing imino groups, and/or;(ii) an aromatic compound or a heterocyclic compound containing mercapto groups; and,(c) an organosilicon compound containing an epoxy group and a hydrolyzable group;(C) an inorganic filler; and,(D) a curing catalyst.

Abstract: Single-component diorganopolysiloxane compositions, stable in storage in the absence of atmospheric moisture and crosslinkable into elastomeric state in the presence of moisture, well adapted, e.g., as sealants and adhesives for the construction industry, contain (A) a diorganopolysiloxane polymer having silanol endgroups, (B) a ketiminoxysilane crosslinking agent, (C) a stabilizing amount of an isocyanurate of the formula: ##STR1## (D) an inorganic filler material, and (E) a metal curing catalyst.

Abstract: Disclosed herein is a fibrillated weatherproof web having a network structure, which can be produced with ease and is economical. The web comprises a multilayer composite film composed of at least two layers, one being a first layer (I) made of a first thermoplastic resin and the other a second layer (II) made of a second thermoplastic resin having a melting point lower than the first thermoplastic resin and containing at least 300 ppm of a light resistance imparting agent. A number of slits have been formed in a longitudinal or transverse direction. The web has been oriented at a draw ratio in a range of from 1.1 to 15 times. A nonwoven fabric making use of one or more fibrillated webs of the above sort and processes for the production of the web and nonwoven fabric are also disclosed.

Abstract: Compositions for coating the surface of electrical high-voltage insulators, which are stable on storage in the absence of water and can be crosslinked to form elastomers at room temperature when exposed to water comprising(I) a diorganopolysiloxane having terminal groups capable of condensation with(II) a silicon compound having at least three hydrolyzable groups directly bonded to silicon per molecule;(III) optionally, an organic, nonreactive solvent; and(IV) an additive which is obtained by blending(A) 60 to 80 percent by weight of a diorganopolysiloxane containing 75 to 85 mol percent of dimethylsiloxane units and 15 to 25 mol percent of vinylmethylsiloxane units;(B) 20 to 35 percent by weight of titanium dioxide or zirconium dioxide;(C) 0.05 to 0.

Abstract: A thermally conductive silicone composition comprising:(A) 100 parts by weight of a polyorganosiloxane containing at least two silicon-bonded alkenyl groups per molecule and having a viscosity as measured at 25.degree. C. of 10 to 100,000 cP;(B) a polyorganohydrogensiloxane containing at least three silicon-bonded hydrogen atoms per molecule in an amount such that the number of silicon-bonded hydrogen atoms contained therein is 0.5 to 4.0 per alkenyl group contained in component (A);(C) a catalyst selected from the group consisting of platinum and platinum compounds, in an amount of 0.1 to 100 ppm by weight, in terms of the amount of platinum atoms, based on the amount of component (A);(D) 100 to 800 parts by weight of a heat transfer filler having an average particle diameter of 5 to 20 .mu.m and having a particle size distribution such that particles having a particle diameter of 5 .mu.m or less are 20% or more of the whole particles and particles having a particle diameter of 10 .mu.

Abstract: A process for producing PET based polyester polymers from a lower dialkyl ester of a dicarboxylic acid and a glycol selected from the class of ethylene glycol, diethylene glycol, polyethylene glycol, blends of ethylene glycol and propane and/or butane diol, or mixtures of two or more of these, using the novel catalyst system and a small amount of dicarboxylic acid is described. The novel catalyst composition includes from about 10 ppm to about 150 ppm manganese; from about 50 ppm to about 250 ppm lithium; preferably from about 10 ppm to about 40 ppm cobalt; and from about 200 ppm to about 400 ppm antimony, all amounts being based upon the expected yield of the polyester based polymer.

Abstract: A gasket and packing material which exhibits excellent adhesiveness to substrates and resistances to degradation of properties when exposed to hot hydrocarbon oils and coolants such as used in an automobile radiator are made by curing a composition which contains polydimethylsiloxane, an organopolysiloxane having R'.sub.3 SiO.sub.0.5 and SiO.sub.2 units or R'.sub.3 SiO.sub.0.5, R'.sub.2 SiO, and SiO.sub.2 units, an inorganic filler, an alkoxysilane adhesion promoter, and a ketoxime silicon compound crosslinker.

Abstract: Active hydrogen-containing compositions having internal mold release components are used in a process in preparing molded polymeric products. In the process, the active hydrogen-containing composition contains (a) a primary or secondary amine, (b) a carboxylic acid or amido carboxylic acid salt of a group II metal or of aluminum, lithium, copper, iron, cobalt or nickel, and optionally (c) a carboxylic acid or amido carboxylic acid.

Abstract: Active hydrogen-containing compositions having internal mold release components for use in preparing molded polymeric products are disclosed which contain (a) a primary or secondary amine, (b) a carboxylic acid or amido carboxylic acid salt of a group II metal or of aluminum, lithium, copper, iron, cobalt or nickel, and optionally (c) a carboxylic acid or amido carboxylic acid.

Abstract: Organopolysiloxane compositions that are storage-stable under anhydrous conditions, but curable into elastomeric state in the presence of moisture and, thus, are well suited as sealants and coatings and which particularly strongly adhere to substrates used in the construction industry, contain at least one .alpha., .omega.-dihydroxydiorganopolysiloxane polymer; at least one ketiminoxysilane crosslinking agent therefor; a bonding agent including admixture, or reaction product of, (i) an aminoorganosilicon compound containing a primary amine group, with (ii) an organosilicon compound containing an epoxy functional group; and, advantageously, a filler material and a curing catalyst.

Abstract: A colored macromolecular polymer is produced by a method which comprises dissolving a soluble salt of a noble metal in a liquid monomer, polymerizing the monomer having the soluble salt of the noble metal dissolved therein, and subjecting the resultant solid polymer to a heat treatment at a temperature equal to or exceeding the colloid-forming temperature of the noble metal.

Abstract: A silicone composition which is stable in the absence of moisture, but cures to an elastomer upon exposure to moisture consists essentially of a hydroxyl endblocked polydiorganosiloxane; a difunctionalsilane having acetamido, urea, or urethane functional groups; and a tetrafunctionalsilane having oximino functional groups. A composition containing 100 parts by weight of the polydiorganosiloxane, from 0.1 to 7 parts by weight of difunctionalsilane, from 0.1 to 7 parts by weight of tetrafunctionalsilane, and a ratio of difunctionalsilane to tetrafunctionalsilane of from 0.1 to 3, and optional filler is useful as a sealant or adhesive, having an improved skin over time.

Abstract: Organopolysiloxane compositions that are storage-stable under anhydrous conditions, but curable into elastomeric state in the presence of moisture and, thus, are well suited as sealants and coatings and which particularly strongly adhere to substrate used in the construction industry, contain at least one .alpha., .omega.-dihydroxydiorganopolysiloxane polymer; at least one acyloxysilane crosslinking agent therefor; a bonding agent including admixture, or reaction product of, (i) an aminoorganosilicon compound containing a primary amine group, with (ii) an organosilicon compound containing an epoxy functional group; and, advantageously, a filler material and a curing catalyst.

Abstract: The pumpability and extrudability of a mixture of linear polymer and filler can be controlled by using a mixture of filler particle sizes. For 100 parts by weight of polymer there is mixed in from 50 to 150 parts by weight of filler mixture, the filler mixture comprising from 0.5 to 50 percent by weight of a large particle size filler having an average particle diameter of from 0.5 to 10 micrometers and from 50 to 99.5 percent by weight of a small particle size filler having an average particle diameter of less than 0.1 micrometers, the large particle size filler having an average particle diameter of at least 10 times the average particle diameter of the small particle size filler. By adjusting the ratio of large particle size filler to small particle size filler, the change in viscosity of the mixture with change in temperature can be controlled.

Abstract: Improved water-absorbing, crosslinked acrylate resins are prepared by aqueous polymerization of (A) acrylic acid neutralized 70 to 100 mole percent for example with ammonia and/or caustic alkali and/or an amine; with (B) acrylamide in a mole ratio of 70 to 100 mole percent (A) to 30:0 mole percent (B); (C) styrene, in an amount of 0% to 25% based on the weight of acrylic acid or acrylate; and (D) a water miscible or a water soluble polyvinyl monomer in the presence of (E) a metal oxide, such as titanium dioxide, in an amount of 0.001% to 5% based on the total weight of (A), (B), (C), (D) and (E), such that the amount of (D) is 0.001 to 0.6 weight percent based on the total weight of (A), (B), (C), (D) and (E). In addition, surface treating the water-absorbing crosslinked acrylate resins with a polyquaternary amine substantially further increases both the rate of water absorption and the quantity of water absorbed and retained by the metal oxide-containing resin.

Abstract: Compact polymer/metal composite particles, sized or unsized, in which the metal is in the form of crystallites encapsulated in a polymer matrix. The composite particles may be prepared by introducing a metal complex into a swollen polymer in an organic liquid which is a solvent for the metal complex, followed by thermal decomposition of the metal complex and removal of the swelling organic liquid. The composite particles may be used in biological applications.

Abstract: Cured silicone rubber powder containing large amounts of particulate material formed by dispersing a liquid silicone rubber composition curable by a platinum-catalyzed hydrosilation reaction into water. The presence of a low molecular weight, volatile polydiorganosiloxane makes it possible to incorporate at least 100 parts by weight of particulate material per 100 parts of curable polydiorganosiloxane into the composition. The volatile polydiorganosiloxane is removed from the cured polwder. Finely divided magnetic metals, electrically conductive materials and reinforcing silica powders can be incorporated using the present method.

Abstract: A process for producing a colored cross-linked molded article by metathesis polymerizing in a mold a mixture comprising metathesis polymerizable monomers such as dicyclopentadiene and a metathesis polymerizable multi-part composition therefor.

Abstract: A silicone sealant which is stable in the absence of moisture and cures upon exposure to moisture to give an elastomer with a controllable modulus is produced by mixing a polydiorganosiloxane having both vinyl and alkoxysilethylene endblocking, alkoxy silane crosslinker, titanium catalyst, and optional filler. The modulus is controlled by varying the ratio of vinyl to alkoxysilethylene endblocking present on the polymer.

Abstract: The method of this invention produces a high strength, one-part fluorosilicone sealant which is stable in the absence of moisture and contains an in situ treated reinforcing silica filler. The fluorosilicone sealant is produced by a process which in situ treats the reinforcing filler with a di(trifluoropropyl)tetramethyldisilazane in the presence of a portion of the fluorosilicone polymer. The remainder of the polymer is then added and the reinforced polymer is admixed with a moisture activated curing system to give a sealant which cures upon exposure to moisture to give an elastomer. The sealant is easily extrudable from a storage container. The cured elastomer has improved tensile strength, tear strength, and elongation values. The cured elastomer, being a fluorosilicone, is resistant to non-polar organic hydrocarbon fluids such as aircraft jet engine fuels and gasoline.

Abstract: An oxidation of rare earth magnetic materials and powders thereof are greatly reduced when coated with a binary or a ternary composition made from (a) at least one amino containing silane compound such as an aminosilane or a polyaminosilane, (b) at least one epoxy resin or (c) an epoxysilane compound. The composition is utilized to coat rare earth magnets or magnet materials or in association with a binder to form a matrix substantially encapsulating the same.

Abstract: Internal mold release compositions for use in preparing molded polymeric products are disclosed which contain (a) a primary or secondary amine (b) a carboxylic acid or amido carboxylic acid salt of a group II metal or of aluminum, lithium, copper, iron, cobalt or nickel, and optionally (c) a carboxylic acid or amido carboxylic acid.

Abstract: A polyether having molecular weight from 1,000 to 50,000, end-blocked with hydrolyzable silyl groups and represented by the general formula (P): ##STR1## where R.sup.1, R.sup.2, R.sup.6 and R.sup.7 individually represent a divalent hydrocarbon group, R.sup.4 represents a monovalent hydrocarbon group, R.sup.8 represents an alkyl group with 1 to 6 carbon atoms, a represents a number from 1 to 3, m represents a number from 10 to 500, n represents a number of 1 or greater and --N.dbd.X.dbd.N-- represents a residue group of a diimino heterocyclic compound, from which nitrogen-bonded hydrogen atoms are eliminated, said diimino heterocyclic compound having no ##STR2## bond in a molecule is produced and utilized in room temperature curing compositions containing inorganic filler and curing catalyst. There is also disclosed a method for producing the above polyether by reacting polyoxyalkylene end-blocked with epoxy groups, diimino heterocyclic compound and organo silicon compound.

Abstract: A polymeric composition of matter comprises a polymer having dispersed therein at least one of colloidal metal and metal oxide particles in the submicrometer size range, said composition being aqueous-free and free of aliphatic hydrocarbon polymers and their halogenated derivatives. Methods for preparing the dispersions of the invention are also disclosed.

Abstract: Oxidation of rare earth magnetic materials and powders thereof are greatly reduced when coated with a binary or a ternary composition made from (a) at least one amino containing silane compound such as an aminosilane or a polyaminosilane, or (b) at least one epoxy resin, or (c) an epoxy silane compound. The composition is utilized to coat rare earth magnet or magnet materials or in association with a binder to form a matrix substantially encapsulating the same.

Abstract: Polyalkoxysilyl-terminated polydiorganosiloxanes which are relatively stable in viscosity over prolonged storage periods are prepared by endcapping a silanol-terminated polydiorganosiloxane in the presence of a catalytic amount of an acidic amine salt which subsequently decomposes to substantially inert products, preferably an amine salt of formic acid, and in the absence of silicon-nitrogen compounds and enoxysilanes normally used as catalyst quenchers and scavengers. The products are useful for the preparation of scavenger-free room temperature vulcanizable compositions, particularly when combined with certain N-alkoxy-silylalkyl-substituted compounds as adhesion promoters.

Abstract: Stable dispersion of addition (co)polymers in an inert relatively non-polar organic hydrocarbon liquid, the dispersed particles embracing both a (co)polymer and a polymer containing an ethylenically unsaturated monomer. The (co)polymers are substantially composed of:(a) 5 to 100 mole % of styrene and/or methyl styrene;(b) 0 to 95 mole % of alkyl methacrylate having 1 or 2 carbon atoms in the alkyl group and/or alkoxyalkylene methacrylate having 1 or 2 carbon atoms in the alkoxy group and the alkylene group;(c) 0 to 40 mole % of alkyl methacrylate having 3 to 12 carbon atoms in the alkyl group;(d) 0 to 40 mole % of hydroxalkyl methacrylate having 2 to 12 carbon atoms in the alkyl group and/or glycidyl methacrylate; and(e) 0 to 20 mole % of m methacrylic acid.The (co)polymers are grafted to a polymer of a number average molecular weight of 2000 to 10.

Abstract: Copolyesteramides consisting of specific units can be injection molded at a low temperature into a part having a high heat distortion temperature. A filled composition is obtained by blending the copolyesteramide with an inorganic filler. A magnetic resin composition is obtained by blending the copolyesteramide with an magnetic powder.The copolyesteramide consists essentially of units <I>, <II>, <III>, <IV>, and <V> of the following formulae: ##STR1## wherein each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 is independently at least one divalent radical selected from the group consisting of para-phenylene, 2,6-naphthalene, and 4,4'-biphenylene,R.sup.5 is a para- or meta-phenylene radical,X.sup.1 is --NH--,X.sup.

Abstract: A heat-resistant silicone rubber is obtained from a composition of a vinyl-containing polyorganosiloxane, a hydrogenpolyorganosiloxane, a platinum-containing catalyst, carbon black, and an acetylacetone salt of a metal wherein the metal can be copper, zinc, aluminum, iron, cerium, zirconium, or titanium. The silicone rubber can maintain its rubber properties at temperatures of 350.degree. C. for prolonged periods of time.

Abstract: The reaction product of an adduct of an ethylenically unsaturated monohydric alcohol, such as 2-hydroxyethyl acrylate, with an organic diisocyanate in which one of the two isocyanate groups is more strongly reactive than the other, such as isophorone diisocyanate, is reacted with a phenoxy resin in solvent solution. The alcohol is used in a molar excess of at least about 3% up to 30% to insure the absence of any significant proportion of unreacted diisocyanate. The phenoxy resin which is reacted with is a high molecular weight hydroxy functional polyether having a number average molecular weight above 10,000 and an hydroxy functionality in the range of from about 20 to about 300. The adduct is used in an amount to introduce about 1.5 to about 20 ethylenically unsaturated groups per molecule of the polyether, and the reaction is continued to substantially eliminate unreacted isocyanate functionality.

Abstract: Aqueous silicone dispersions containing (a) polydiorganosiloxanes having hydroxyl groups in the terminal units, (b) (organo)metallic compound(s), (c) a siliconate, and optionally, (d) a silicone resin.These aqueous silicone dispersions will cure to form elastomeric coatings or sealants when the water is removed by evaporation.

Abstract: Heat-vulcanizable organopolysiloxane compositions, adopted for curing into silicone elastomers having improved reversion and oil resistance and useful, e.g., as seals in contact with hot oils, comprise at least one diorganopolysiloxane resin (A) having a viscosity of greater than 1,000,000 mPa.s at 25.degree. C., a reinforcing and/or semireinforcing filler material (B), an organic peroxide (C), an organosilicon compound (D) containing at least one acryloyloxyalkyl or methacryloyloxyalkyl group bonded to a silicon atom, and (E) at least one oxide or hydroxide of an alkaline earth metal.

Abstract: The water permeability of cured thermosetting organic resin compositions is reduced and the dimensional stability of these compositions during molding is improved by the addition to the curable resin composition of a finely divided, cured organosiloxane material prepared from a curable organopolysiloxane, a curing agent for the organopolysiloxane, an optional silica filler and an aromatic hydrocarbon compound containing a substituted benzene ring where the substituent is a monovalent ethylenically unsaturated hydrocarbon radical or an alkenyloxy radical.

Abstract: Finely divided water insoluble solid particles free of ionic charges and ranging in size from about 0.01 to several hundred microns or higher, including but not limited to paint pigment particles, are given a generally uniform polymeric encapsulation by admixing such particles in an aqueous reaction medium with a water insoluble monomer polymerizable to form a generally water insoluble polymer free of ionic charges in the presence of a nonionic surface active stabilizing agent, preferably a polyethoxylated alkyl phenol containing at least about eight carbon atoms in the alkyl group thereof and preferably at least about 40-50 ethylene oxide groups per molecule, and polymerization of the monomer is then initiated, usually with heating, with a redox polymerization initiating system which is free of ionic groups and does not decompose to release ionic groups in the reaction medium.

Abstract: A room temperature-curable silicone rubber composition having improved heat-resistance is disclosed. The composition is formulated without any siliceous fillers as a reinforcing inorganic filler conventionally used in silicone compositions and, instead, comprises carbon black as a reinforcing filler. Namely, the composition comrises a major amount of a hydroxy-containing organopolysiloxane admixed with a minor amount of an organosilicon compound having at least two hydrolyzable groups per molecule, a curing catalyst, carbon black and iron oxide.

Abstract: A microgel dispersion characterized by that an oil-soluble surface active agent is adsorbed or adhered onto a gel consisting of a fine particle substance and a polymer, and said gel is dispersed in a non-aqueous organic solvent.

Abstract: Storage stable, water-free, RTV organopolysiloxane adhesives curable in the presence of water or atmospheric moisture, and comprising a dihydroxydiorganopolysiloxane polymer, fillers, an amine fraction and a curing catalyst, are characterized by incorporation therein of a polyalkoxylated organosilane having the formula:R'.sub.x Si[(OCH.sub.2 CH.sub.2).sub.p OCH.sub.3 ].sub.4-xwherein R' is methyl, vinyl, allyl, methallyl or phenyl, and p and x are each one or two.

Abstract: A curable silicone coating composition which is resistant to dirt pickup, comprising:(1) a vinyl chainstopped polysiloxane having a viscosity up to 2,000,000 centipoise;(2) 1 to 2 parts of a resinous organopolysiloxane copolymer per part of (1);(3) a platinum catalyst and,(4) an organohydrogenpolysiloxane crosslinking agent.

Abstract: Stable dispersion of addition (co)polymers in an inert relatively non-polar organic hydrocarbon liquid, the dispersed particles embracing both a (co)polymer and a polymer containing an ethylenically unsturated monamer. The (co)polymers are substantially composed of:(a) 5 to 100 mole % of styrene and/or methyl styrene;(b) 0 to 95 mole % of alkyl methacrylate having 1 or 2 carbon atoms in the alkyl group and/or alkoxyalkylene methacrylate having 1 or 2 carbon atoms in the alkoxy group and the alkylene group;(c) 0 to 40 mole % of alkyl methacrylate having 3 to 12 carbon atoms in the alkyl group;(d) 0 to 40 mole % of hydroxyalkyl methacrylate having 2 to 12 carbon atoms in the alkyl group and/or glycidyl methacrylate; and(e) 0 to 20 mole % of methacrylic acid.

Abstract: Finely divided water insoluble solid particles free of ionic charges and ranging in size from about 0.01 to several hundred microns or higher, including but not limited to paint pigment particles, are given a generally uniform polymeric encapsulation by admixing such particles in an aqueous reaction medium with a water insoluble monomer polymerizable to form a generally water insoluble polymer free of ionic charges in the presence of a nonionic surface active stabilizing agent, preferably a polyethoxylated alkyl phenol containing at least about eight carbon atoms in the alkyl group thereof and preferably at least about 40-50 ethylene oxide groups per molecule, and polymerization of the monomer is then initiated, usually with heating, with a redox polymerization initiating system which is free of ionic groups and does not decompose to release ionic groups in the reaction medium.