Abstract: A novel branched siloxane-silalkylene copolymer containing a plurality of silicon-bonded hydrogen atoms or silicon-bonded alkoxy groups in the molecule. The copolymers are used to improve properties, such as, mechanical strength, adhesiveness, and durability of the an product.

Abstract: A curable organopolysiloxane composition that can form a cured product that is strongly adhesive to substrates such as glasses, plastics, and metals and exhibits a very durable adhesion in which adhesiveness is maintained even under severe conditions such as immersion in hot water. The curable organopolysiloxane composition comprises from 1 to 75 weight % of a calcium carbonate powder whose surface has been treated with both (a) a rosin or a rosin derivative and (b) a fatty acid or a fatty acid derivative.

Abstract: The invention relates to a gas barrier composition as well as to composite structures having at least one surface of a molded resin coated with the composition, said composition comprising:(A) an alkoxysilyl functional polyamine compound, or a hydrolyzate thereof, said polyamine compound having three or more amine groups, at least one nitrogen atom of said amine groups being bonded to a hydrogen atom and at least one nitrogen of said amine groups being bonded to an alkoxysilyl group expressed by the formula--W--SiR.sup.2.sub.3-f (OR.sup.1).sub.fwherein R.sup.1 is an alkyl group having 1 to 6 carbon atoms, R.sup.

Abstract: A curable composition, comprising a siloxane grafted vinyl polymer as its main component, reacts with an organic silicon compound having silicon-bonded hydrogen atoms in the presence of a hydrosilylation catalyst to form a peelable cured coating film. The siloxane grafted vinyl polymer has two unique grafted siloxane chains represented by the following general formulae (A) and (B): ##STR1## where R.sup.1 is a divalent organic group, R.sup.2 is a monovalent hydrocarbon group which is free of aliphatic bonds, R.sup.3 is a monovalent hydrocarbon group, Y is a monovalent organic group having unsaturated aliphatic bonds, a is 0 or 1, m is an integer between 0 and 20, n is an integer which is I or greater, and p is an integer of 1, 2 or 3.

Abstract: To provide a composition and process for forming insulating films that can produce insulating films having low dielectric constants. The composition comprises (A) an electrically insulating curable inorganic or organic resin, (B) a solvent, and (C) at least one solvent-soluble substance (excluding the solvent used for component (B)) that upon heating or by interaction with the resin (A) can generate gas or undergo volatilization in the temperature range from 0.degree. C. to 800.degree. C. The insulating films are prepared by coating the surface of a substrate the composition; evaporating the solvent; and subsequently heating the substrate in order to generate gas from component (C) during the course of or after the cure of the said resin (A).

Abstract: A method for preparing organosilicon compounds comprises: 1) converting the Si-bonded alkoxy in an Si-bonded alkoxy-functional organosilicon compound to the diorganosilyl group by reacting the Si-bonded alkoxy-functional organosilicon compound with organodisiloxane with the general formula HR.sub.2 Si--O--SiR.sub.2 H, where R is a monovalent hydrocarbyl group of 1 to 10 carbon atoms, in alcohol-containing acidic aqueous solution; and subsequently 2) treating with a sulfonic acid catalyst and carboxylic acid. This method is able to convert all the alkoxy groups in the alkoxy-functional organosilicon compound to diorganosilyl. This method can be used to synthesize a high-purity carbosiloxane dendrimer having a narrow molecular weight distribution.

Abstract: A polycarbonate containing repeating units (1) represented by the general formula (1), a polycarbonate molding produced by molding the polycarbonate, and an electrophotographic photoreceptor having a photosensitive layer which has a surface layer containing the polycarbonate: ##STR1## wherein R is an aliphatic unsaturation-free monovalent hydrocarbon group, R.sup.1 is a halogen atom, an alkyl group, an alkoxy group or an aryl group, X is an alkylene group or an alkyleneoxyalkylene group, X' is an alkylene group of 2 or more carbon atoms, an alkyleneoxyalkylene group or oxygen atom, a is an integer of 0 to 4, na is 0 or 1, nb is 1 or 2, nc is 1 or 2, provided na+nb+nc=3, n1, n2, n3 and n4 are 0 or an integer of 1 or more, provided n1+n2+n3+n4 is an integer of 0 to 450.

Abstract: Silicone rubber composition comprising an alkenyl-substituted diorganopolysiloxane, an inorganic filler, an organopolysiloxane that contains at least two silicon-bonded hydrogen atoms in each molecule, in a quantity that affords a value from 0.4 to 10 for the molar ratio of silicon-bonded hydrogen in the organopolysiloxane to alkenyl groups in the alkenyl-substituted diorganopolysiloxane, an organohydrogenpolysiloxane, in a quantity that affords a value from 0.01 to 0.5 for the molar ratio of silicon-bonded hydrogen in this component to alkenyl groups in the alkenyl-substituted diorganopolysiloxane, and a platinum catalyst.A fluororesin-covered fixing roll in which a fluororesin layer is placed over the circumference of a roll shaft with a silicone rubber layer interposed between the fluororesin layer and the roll shaft, wherein said silicone rubber composition is formed by curing the silicone rubber composition described above.

Abstract: A method for preparaing of an organofunctional organopentasiloxane which finds utility as a modifier for organic resins is disclosed, said method comprising:(I) reacting(A) a cyclotrisiloxane and(B) an .alpha.,.omega.-dihydrogendiorganodisiloxane in the presence of an(C) acid catalystto prepare an .alpha.,.omega.-dihydrogendiorganopentasiloxane having the formulaR.sub.2 HSiO(R.sub.2 SiO).sub.3 SiHR.sub.2wherein R independently represents a monovalent group free of aliphatic unsaturation selected from hydrocarbon or halogenated hydrocarbon groups; and(II) running an addition reaction in the presence of (D) a hydrosilylation catalyst between said .alpha.,.omega.-dihydrogendiorganopentasiloxane and (E) an organic compound containing a monovalent group selected from epoxy or phenol groups as well as an unsaturated aliphatic hydrocarbon group. In a variation of the method, the .alpha.,.omega.

Abstract: A silicone rubber particulate composition useful as an additive for cosmetics, rubbers, resins and paints is disclosed, said composition comprising:(A) a silicone rubber particulate having an average particle size of 0.1 to 1,000 .mu.m;(B) a water-absorptive resin particulate having a water-free average particle size of 0.1 to 1,000 .mu.m; and(C) water,wherein said component (B) is present at a level of 0.01 to 5 weight percent measured on a water-free basis relative to component (A) and said water is present at a level of 10 to 10,000 weight parts for each 100 weight parts of component (B).

Abstract: A hydroxyphenyl-containing silalkarylene compound having the formula: ##STR1## wherein R is a monovalent hydrocarbon group containing no aliphatic unsaturated bonds, R.sup.1 is alkylene having 1 to 10 carbon atoms, Ph is substituted or unsubstituted phenylene, A is substituted or unsubstituted hydroxyphenyl, B is alkylene having at least 2 carbon atoms or alkylenoxyalkylene, x is from 1 to 100, y is from 0 to 60, and a is 0 or 1. A silalkarylene-modified organic resin obtained by copolymerizing a hydroxyphenyl-containing silalkarylene compound with an organic resin monomer and a coating agent comprising a silalkarylene-modified organic resin.

Abstract: A silicone rubber composition that has excellent discharge and flow characteristics prior to its cure and that cures into a highly transparent silicone rubber comprises:(A) polyorganosiloxane,(B) microparticulate silica,(C) methyloligosiloxane endblocked at one molecular chain terminal by silanol and endblocked at the other terminal by trimethylsiloxy, and(D) a curing agent.

Abstract: A method of preparing a coating agent, the method comprising the steps of (I) reacting (A) a polymer having at least two organic groups containing carbon-carbon unsaturated bonds with (B) an alkoxysilane containing a silicon-bonded hydrogen atom in an organic solvent and in the presence of a hydrosilylation catalyst to produce a solution containing an alkoxysilyl-functional polymer, wherein component (A) has a number-average molecular weight of 500 to 100,000 and has a principal chain comprise a polycarbonate or a polyallylate; and the alkoxysilane is an alkoxysilane having the formula H--SiR.sup.3.sub.3-a (OR.sup.4).sub.a or a partial hydrolyzate thereof, wherein R.sup.3 is a monovalent hydrocarbon group having 1 to 10 carbon atoms, R.sup.

Abstract: A silicone rubber composition for application as electrical insulation that cures into a highly water-resistant silicone rubber that has excellent electrical properties and in particular has excellent high-voltage electrical insulation properties. The silicone rubber composition comprises(A) polyorganosiloxane,(B) surface-treated aluminum hydroxide powder surface treated with an organosilane or organosilazane, and(C) curing agent.Also, the composition afforded by the addition of 1 to 200 weight parts (D) microparticulate silica to components (A) to (C).

Abstract: Silicone rubber composition comprising an alkenyl-substituted diorganopolysiloxane, an inorganic filler, an organopolysiloxane that contains at least two silicon-bonded hydrogen atoms in each molecule, in a quantity that affords a value from 0.4 to 10 for the molar ratio of silicon-bonded hydrogen in the organopolysiloxane to alkenyl groups in the alkenyl-substituted diorganopolysiloxane, an organohydrogenpolysiloxane, in a quantity that affords a value from 0.01 to 0.5 for the molar ratio of silicon-bonded hydrogen in this component to alkenyl groups in the alkenyl-substituted diorganopolysiloxane, and a platinum catalyst. A fluororesin-covered fixing roll in which a fluororesin layer is placed over the circumference of a roll shaft with a silicone rubber layer interposed between the fluororesin layer and the roll shaft, wherein said silicone rubber composition is formed by curing the silicone rubber composition described above.

Abstract: Resin composition for powder paints, that has an excellent curability and excellent electrostatic properties (wraparound) and that provides cured coatings having an excellent appearance, weathering resistance, and mechanical properties, comprising (A) epoxy-functional branched organopolysiloxane and (B) a compound bearing a functional group reactive with the epoxy group, wherein the component (A)/component (B) weight ratio is from 2/98 to 98/2, or comprising (A) epoxy-functional branched organopolysiloxane, (3) a compound bearing a functional group reactive with the epoxy group, and (C) a compound bearing a functional group reactive with the functional group in component (B), wherein the component (A)/(component (B)+component (C)) weight ratio is from 2/98 to 98/2.

Abstract: A surface modifier composition that exercises an excellent antistatic performance, offers an excellent storage stability, and provides an excellent surface feel, surface protection, and surface lubricity; that does not suffer from deterioration over long periods of time; that exhibits an excellent blending stability with respect to cosmetics, lubricants, lustrants, antifoams, fiber-treatment agents, and paints; and that has an excellent capacity to improve a variety of surface properties. The surface modifier composition comprises an (A) amidepolyether-modified organopolysiloxane and an (B) alcoholic functional group-containing compound.

Abstract: To provide a composition for the formation of insulating films that can form an insulating film having a low dielectric constant. The composition comprises (A) an electrically insulating curable resin selected from the group consisting of electrically insulating curable organic resins and electrically insulating curable inorganic resins; and (B) at least two solvents: (B)(i) a solvent capable of dissolving resin (A) and (B)(ii) a solvent whose boiling point or vapor pressure curve differs from that of solvent (B)(i) or whose affinity for resin (A) differs from that of solvent (B)(i). Also claimed is a method for forming a insulating films that have a dielectric constant of less than 2.7.

Abstract: A curable silicone composition for a vibration-isolating laminate comprising (A) 100 parts by weight of an organopolysiloxane having at least two alkenyl groups per molecule and a viscosity of 10-100,000 mPa.s at 25.degree. C.; (B) an organopolysiloxane having at least two silicon atom-bonded hydrogen atoms per molecule and a viscosity of 1-100,000 mPa.s at 25.degree. C. in an amount such that this component contains 0.2-5 mol of silicon atom-bonded hydrogen atoms per mole of alkenyl groups in component (A); (C) 1-300 parts by weight of an inorganic filler; and (D) a hydrosilylation catalyst in an amount sufficient to cure the composition, designed for forming a cured silicone product for a vibration-isolating laminate by laminating a metal layer and a cured silicone layer having a loss factor of 0.4 or greater and a storage modulus of 1.0.times.10.sup.5 dyne/cm.sup.2 or greater at 25.degree. C. and a shear frequency of 0.2 Hz.

Abstract: A silphenylene polymer having the general formula: ##STR1## wherein each R is independently a monovalent hydrocarbon group free of aliphatic unsaturation and having 1 to 10 carbon atoms; Ph is a substituted or unsubstituted phenylene group; R.sup.1 is an alkylene group having 2 to 10 carbon atoms or an alkyleneoxyalkylene group; A is a hydrolyzable group or a hydroxy group; B is an alkylene group having 2 to 10 carbon atoms, an alkyleneoxyalkylene group, or an oxygen atom; n is an integer from 0 to 2; x is an integer having a value of at least 1; y is an integer having a value of at least 0; and z is an integer having a value of at least 0.