Abstract: A heat curable liquid silicone rubber composition with good hydrocarbon oil resistance comprises:(A) a first vinyl-containing polydiorganosiloxane that is vinyldiorganosiloxy terminated, having a viscosity of from 20 to 200 Pa.s at 25.degree. C. and containing essentially no ethylenically unsaturated hydrocarbon radicals bonded to non-terminal silicon atoms,(B) a second vinyl-containing polydiorganosiloxane that is either vinyldiorganosiloxy terminated or triorganosiloxy terminated, miscible with the first polydiorganosiloxane and having a viscosity of from about 0.1 to 200 Pa.s at 25.degree. C.

Abstract: Novel methods for the preparation of polymers useful as precursors to ceramic materials by catalytic activation of Si--H bonds are disclosed. The methods comprise reacting, in the presence of a catalyst effective to activate Si--H bonds, Si--N bonds, or both, and/or a reactive solvent, a polymer in the form of a polysilane, polysilazane, polysiloxane or polycarbosilane with a reactant having the structural formula R--X--H, wherein X is NR' or O, R is H, organic, silyl, siloxyl, silazanyl or carbosilyl and may contain at least one additional X--H group, and R' is H, amino, silyl or silazanyl, to produce a modified polymer containing at least one Si--X bond. Polymers produced by these methods are also disclosed.

Abstract: A propellant-free composition for lustering and protecting a surface such as a rubber sidewall of a vehicle tire or a vinyl or similar surface. The composition has (1) from about 10 wt. % to 100 wt. % of a high molecular weight liquid linear polysiloxane having a molecular weight above about 550, and (2) from 0 wt. % to about 90 wt. % of a low molecular weight liquid linear and/or cyclic polysiloxane having a molecular weight below about 550. Surface activity of the silicone component of the composition is such that the high molecular weight polysiloxane functions to produce a high luster, while the low molecular weight polysiloxane functions as an evaporative carrier-solvent diluent medium for delivery of the silicone component to the surface and to produce an even distribution on that surface.

Abstract: A liquid curable resin composition comprising a dialkylpolysiloxane particles with at least two urethane bonds and/or urea bonds in the terminal groups. The resin composition exhibits superior shelf life in a liquid state and produces cured products having a slippery surface. It is suitable as a coating material for optical fibers, particularly as a ribbon matrix material and a bundling material.

Abstract: The invention provides a primer composition comprising (I) an organoalkoxysilane or siloxane, (II) an organohydrogensiloxane having an SiH group and an alkoxysilyl group, and (III) an organic titanate. Also provided is a primer composition comprising (A) an alkenyl-containing organopolysiloxane, (B) an organopolysiloxane, (C) an organoalkoxysilane or siloxane, (D) an organohydrogensiloxane having an SiH group and an alkoxysilyl group, (E) a platinum catalyst, (F) an organic titanate, and (G) an organic peroxide. The primer compositions have sufficient adhesion to join thermoset silicone rubber to various substrates.

Abstract: A coating composition particularly useful as a clear coating used over a pigmented base coat that has improved resistance to marring and to acid etching when exposed to natural weathering conditions containing 40-70% by weight of film forming binder and 30-60% by weight of a volatile liquid carrier for the binder; wherein the binder containsa.

Abstract: The invention relates to a RTV silicone composition having increased hot oil resistance upon curing. The RTV silicone composition comprises a polydiorganosiloxane, an acyloxy-functional crosslinker, a metal salt of a carboxylic acid catalyst, a filler, and a metal acetate. In a preferred embodiment a metal acetylacetonate is also added.

Abstract: A novel crosslinkable composition comprising(A) an organosilicon compound having radicals containing aliphatic carbon-carbon multiple bonds,(B) an organosilicon compound having Si-bonded hydrogen atoms,(C) a catalyst which promotes the addition of Si-bonded hydrogen onto aliphatic multiple bonds and, optionally,(D) agents which retard the addition of Si-bonded hydrogen onto aliphatic multiple bonds at room temperature,wherein the organosilicon compounds having Si-bonded hydrogen atoms (B) used are ones comprising(a) on average per molecule, at least one structural unit of the formula--Z--SiR.sub.x (OSiR.sub.3-a H.sub.a).sub.3-x (I),whereR is an identical or different monovalent, optionally halogenated hydrocarbon radical which is free of aliphatic multiple bonds and has from 1 to 8 carbon atoms per radical,Z is a divalent aliphatic hydrocarbon radical having from 2 to 12 carbon atoms per radical,a is 1, 2 or 3, andx is 0 or 1.

Abstract: The present invention relates to improving the durability of water repellent films and a method for providing the film on a substrate. The water repellent film is preferably formed over the substrate by applying a water repellent composition Over the substrate which will form the water repellent film. The durability of the water repellency of the film is improved by activating the substrate with an acid prior to forming the water repellent film over the substrate.

Abstract: Provided are a thermally conductive silicone composition, a thermally conductive material and a thermally conductive silicone grease, wherein a liquid silicone, an aluminum nitride powder and a zinc oxide powder are comprised, and wherein the total amount of those powders are from 500 to 1,000 parts by weight per 100 parts by weight of the liquid silicone and the ratio of the zinc oxide powder to the sum total of the aluminum nitride powder and the zinc oxide powder is from 0.05 to 0.5 by weight.

Abstract: A polishing apparatus is used for polishing a workpiece such as a semiconductor wafer to a flat mirror finish. The polishing apparatus comprises a turntable having a polishing surface, and a top ring having a pressing surface for holding a workpiece to be polished and pressing the workpiece against the polishing surface of the turntable. At least one of the polishing surface of the turntable and the pressing surface of the top ring is a curved surface such as a convex surface or a concave.

Abstract: A flame retarded resin molding compositions with enhanced weatherable properties, which comprise a polyester and polycarbonate blend modified with an organopolysiloxane-polycarbonate and a glycidyl ester impact modifier for enhancing weatherablity and a flame retarding amount of a halogenated flame retardant.

Abstract: The present invention provides an organopolysiloxane having acryloyl groups or methacryloyl groups at both terminals thereof, where silicon atoms at both terminals of the organopolysiloxane are each independently added to double bonds each of acryloyl groups or methacryloyl groups of compounds each having at least two acryloyl groups or methacryloyl groups; a curable resin composition comprising such an organopolysiloxane; and a process for producing such an organopolysiloxane comprising adding a compound having at least two acryloyl groups or methacryloyl groups to an organopolysiloxane having SiH groups at only both terminals thereof. The curable resin composition has distinguished transparency, luster, peelability, surface lubricity and water and oil repellency, and therefore is useful as a resin for mold-releasable paper, a coating agent, an anticorrosive agent for printed substrate, etc.

Abstract: A thermoplastic elastomer is achieved by absorbing an acrylate monomer, an initiator and eventually a diacrylate into polyolefin particles, after which the temperature is raised and the acrylate polymerises into the polyolefin and forms a dispersed phase, which has been functionalized by copolymerising a functional monomer together with the acrylate. As a compatibiliser a grafter polyolefin is used, which is melt-blended after the polymerisation into the thermoplastic elastomer or before the polymerisation into the polyolefin.

Abstract: A precursor composition includes (1) at least one crosslinking compound resented by the formula: ##STR1## wherein: u and x are independently selected positive integers, v and w are independently selected integers greater than or equal to zero, R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7 and R.sup.8 are independently selected from the group consisting of alkyl, aryl, alkylaryl, haloalkyl, haloaryl and mixtures thereof, A and E are independently selected from the group consisting of O, an aliphatic bridge, an aryl bridge and mixtures thereof; and R.sup.9 and R.sup.10 are unsubstituted or substituted vinyl or ethynyl groups, (2) at least one organosilicon compound containing at least two silicon hydride moieties per molecule, and (3) a hydrosilation catalyst. A cross-linked polymer is formed by reacting the crosslinking compound of formula I with the organosilicon compound via a hydrosilation reaction. A thermoset polymer is formed by thermally curing the crosslinked polymer.

Abstract: The invention relates to the use of precrosslinked silicone elastomer particles with an organopolymer shell as the formulation constituent in powder coating material compositions based on thermoplastic or thermosetting binding agents, the silicone elastomer particles containing (a) 5 to 95% by weight, in relation the total weight of the copolymerisate, of a nucleus polymer of the general formula (R.sub.w SiO.sub.2/2).sub.x.(RSiO.sub.3/2).sub.y.(SiO.sub.4/2).sub.z with x=5 to 99.5 mol %, y=0.5 to 95 mol %, z=0 to 30 mol %, and (b) 5 to 95% by weight, in relation to the total weight of the copolymer, of a shell made of an organopolymer of ethylenically mono or multi-unsaturated monomers, R standing for identical or different monovalent C.sub.1 -C.sub.6 alkyl or alkenyl residues or substituted hydrocarbon residues.

Abstract: A resin composition for a white marking, on which a white marking can be clearly developed by irradiation of laser beams, comprises an acrylic resin A, a styrenic resin B, and a black dye/pigment C. Use can be made of poly(methyl methacrylate) as the resin A, a rubber-modified styrenic resin such as an ABS resin as the resin B, and a carbon black as the black dye/pigment C. The proportion of the resin A to the resin B (the former/the latter, by weight) is about 1/99 to 99/1. The proportion of the black dye/pigment C is about 0.01 to 3 parts by weight relative to 100 parts by weight of the total amount of the resin A and the resin B. The resin composition may further comprise a white dye/pigment D such as titanium oxide in 0.01 to 10 parts by weight, relative to 100 parts by weight of the total amount of the resins A and B.

Abstract: The present invention relates to compositions which crosslink to give elastomers, comprising;(A) a polyorganosiloxane (I) with at least two alkenyl groups per molecule and a metallic catalyst (IV) and(B) a polyorganosiloxane (II) with at least two silicon-bonded hydrogen atoms and an organic sulfur compound (III).

Abstract: A method for synthesizing an apophyllite-derived 3-cyanopropyldimethylsiloxy-5-hexenyldimethylsiloxy sheet polymer (A-CM.sub.2 -HEM.sub.2); an apophyllite-derived 3-cyanopropyldimethylsiloxy-vinyldimethylsiloxy sheet polymer (A-CM.sub.2 -VM.sub.2); and an apophyllite-derived 3-cyanopropyldimethylsiloxy-n-decyldimethylsiloxy sheet polymer (A-CM.sub.2 -DM.sub.2). These polymers form gels with simple polar solvents such as acetone and therefore can be easily processed. The first two of the polymers, i.e., A-CM.sub.2 -HEM.sub.2 and A-CM.sub.2 -VM.sub.2, form gels with polar solvents carrying olefinic linkages, and these gels can be crosslinked into sheet composites having fully exfoliated organosilicon sheets in an organic matrix.

Abstract: A vacuum dispensable silicone composition comprising (A) a polydiorganosiloxane containing an average of at least two silicon-bonded alkenyl groups per molecule; (B) an organopolysiloxane resin consisting essentially of (a) R.sup.3.sub.2 (CH.sub.2 .dbd.CH)SiO.sub.1/2 siloxane units, (b) R.sup.3.sub.3 SiO.sub.1/2 siloxane units, and (c) SiO.sub.4/2 siloxane units wherein each R.sup.3 is independently selected from the group consisting of monovalent hydrocarbon and monovalent halogenated hydrocarbon groups free of aliphatic unsaturation, the mole ratio of the combination of (a) and (b) units to (c) units is from 0.6 to 1.