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.