Abstract: An acryloxy or methacryloxy group-containing organosilicon compound of the formula (wherein R1 is a substituted or unsubstituted monovalent hydrocarbon group of 1 to 10 carbon atoms, R2 is a hydrogen atom or a methyl group, R3 is an unsubstituted divalent hydrocarbon group of 1 to 18 carbon atoms, X is a halogen atom and n is an integer of 1, 2 or 3) is to prepared by subjecting a hydrohalosilane compound of the formula HSiXnR13-n ??(1) and an alkenyl group-containing (meth)acrylate compound of the formula to a hydrosilylation reaction in the presence of an acid amide compound and a platinum catalyst. This method is able to suppress, in the industrial scale production of (meth)acryloyloxy group-containing organosilicon compounds, propagation reactions by which the starting (meth)acrylate compound self-polymerizes.

Abstract: Disclosed is a transparent organopolysiloxane composition consisting of a powdery silicone resin having the following general formula (1), a carboxylic acid compound or a natural oil containing the carboxylic acid compound, and an aprotic solvent. (wherein R1 each independently represents a substituted or unsubstituted divalent hydrocarbon group having 1 to 20 carbon atoms which may contain a hetero atom, R2 each independently represents a hydrogen atom, a methyl group, or an ethyl group, and a represents an integer of 2 to 70).

Abstract: This aqueous composition contains: a silanol compound having an imidazolidinone group represented by general formula (1); and a condensate of the silanol compound. The content of an alcohol is less than 5 mass % relative to the content of the silanol compound and the condensate of the silanol compound. The aqueous composition suppresses the generation of alcohols, suppresses excessive condensation of the silanol compound, prevents an increase in molecular weight over time, and yields a colorless transparent aqueous solution. (In the formula, R1 denotes a halogen atom or a methyl group, R2 denotes an unsubstituted divalent hydrocarbon group having 1-8 carbon atoms, and n denotes an integer between 0 and 2.

Abstract: An acryloxy or methacryloxy group-containing organosilicon compound of the formula (wherein R1 is a substituted or unsubstituted monovalent hydrocarbon group of 1 to 10 carbon atoms, R2 is a hydrogen atom or a methyl group, R3 is an unsubstituted divalent hydrocarbon group of 1 to 18 carbon atoms, X is a halogen atom and n is an integer of 1, 2 or 3) is to prepared by subjecting a hydrohalosilane compound of the formula HSiXnR13-n ??(1) and an alkenyl group-containing (meth)acrylate compound of the formula to a hydrosilylation reaction in the presence of an acid amide compound and a platinum catalyst. This method is able to suppress, in the industrial scale production of (meth)acryloyloxy group-containing organosilicon compounds, propagation reactions by which the starting (meth)acrylate compound self-polymerizes.

Abstract: To provide an organosilicon compound having a cyclic silazane structure, represented by the following general formula (1): wherein R1 represents a hydrogen atom, an oxy radical, a hydroxyl group, a substituted or unsubstituted alkoxy group having 1 to 10 carbon atoms, or a substituted or unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms, R2 represents a substituted or unsubstituted alkylene group having 3 to 6 carbon atoms, R3 and R each independently represent a substituted or unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms, and n represents an integer of 0 to 2.

Abstract: Disclosed is a transparent organopolysiloxane composition consisting of a powdery silicone resin having the following general formula (1), a carboxylic acid compound or a natural oil containing the carboxylic acid compound, and an aprotic solvent. (wherein R1 each independently represents a substituted or unsubstituted divalent hydrocarbon group having 1 to 20 carbon atoms which may contain a hetero atom, R2 each independently represents a hydrogen atom, a methyl group, or an ethyl group, and a represents an integer of 2 to 70).

Abstract: Provided is a surface treatment agent including an alkoxysilane compound having a cyclic silazane structure represented by the following general formula (1): wherein R1 represents an unsubstituted linear alkyl group having 6 to 20 carbon atoms, R2 represents a substituted or unsubstituted alkylene group having 3 to 6 carbon atoms that may include a heteroatom, R3 and R4 each independently represent a substituted or unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms, and n represents an integer of 0 or 1.

Abstract: A (meth)acryloyloxy-containing organosilicon compound (3) is prepared by simultaneously feeding a hydrohalosilane compound (1) and a (meth)acrylate compound (2) in the presence of a polymerization inhibitor to a reaction system, and effecting hydrosilylation reaction in the presence of a platinum catalyst. The content of (meth)acrylate compound (2) is 0-100 mol % based on the content of organosilicon compound (3) in the reaction system. R1 is a C1-C10 monovalent hydrocarbon group, X is halogen, n is 1, 2 or 3, R2 is H or methyl, and R3 is a C1-C18 alkylene group.

Abstract: A dielectric property-lowering agent is composed of a specific epoxy-modified silicone resin having a low relative permittivity and a low dielectric loss tangent, and has an ionic species content of less than 0.001 wt %.

Abstract: To provide an organosilicon compound having a cyclic silazane structure, represented by the following general formula (1): wherein R1 represents a hydrogen atom, an oxy radical, a hydroxyl group, a substituted or unsubstituted alkoxy group having 1 to 10 carbon atoms, or a substituted or unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms, R2 represents a substituted or unsubstituted alkylene group having 3 to 6 carbon atoms, R3 and R each independently represent a substituted or unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms, and n represents an integer of 0 to 2.

Abstract: A (meth)acryloyloxy-containing organosilicon compound (3) is prepared by simultaneously feeding a hydrohalosilane compound (1) and a (meth)acrylate compound (2) in the presence of a polymerization inhibitor to a reaction system, and effecting hydrosilylation reaction in the presence of a platinum catalyst. The content of (meth)acrylate compound (2) is 0-100 mol % based on the content of organosilicon compound (3) in the reaction system. R is a C1-C10 monovalent hydrocarbon group, X is halogen, n is 1, 2 or 3, R2 is H or methyl, and R3 is a C1-C18 alkylene group.

Abstract: Provided is a glycoluril ring-containing organosilicon compound having 4 organoxysilyl groups to form silanol groups capable of covalently bonding with hydroxyl groups on an inorganic material surface. The compound imparts mechanical strength and adhesion to an organic/inorganic composite material.

Abstract: Provided is a surface treatment agent including an alkoxysilane compound having a cyclic silazane structure represented by the following general formula (1): wherein R1 represents an unsubstituted linear alkyl group having 6 to 20 carbon atoms, R2 represents a substituted or unsubstituted alkylene group having 3 to 6 carbon atoms that may include a heteroatom, R3 and R4 each independently represent a substituted or unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms, and n represents an integer of 0 or 1.

Abstract: Provided is a glycoluril ring-containing organosilicon compound having 4 organoxysilyl groups to form silanol groups capable of covalently bonding with hydroxyl groups on an inorganic material surface. The compound imparts mechanical strength and adhesion to an organic/inorganic composite material.