Abstract: Provided is a monomer composition for which there is little to no concern about safety when used as a raw material or the like in a cosmetic material and that does not cause deterioration in quality such as gelation or the like. A method for manufacturing the monomer composition is also provided. A monomer composition containing a radical polymerizable monomer having a radical polymerizable organic group and an organosilicon-containing organic group in a molecule, wherein a total concentration of a polymerization inhibitor based on a total mass of the radical polymerizable monomer and the polymerization inhibitor is 130 ppm by mass or less.

Abstract: Provided is a monomer composition which has little to no concern about safety when used as a raw material of a cosmetic material or the like and does not cause deterioration in quality such as gelation. A manufacturing method for the monomer composition is also provided. A radical copolymer composition, comprising a radical copolymer of: a) a radical polymerizable monomer having a radical polymerizable organic group and an organic silicon-containing organic group in a molecule; and b) a radical polymerizable monomer other than component a); wherein the total concentration of a polymerization inhibitor based on the total mass of the radical copolymer and the polymerization inhibitor is 50 ppm by mass or less.

Abstract: A curable silicone resin composition according to the present invention includes at least the following components: (A) a silicone resin having a hydrogen atom bonded to silicon atom (as SiH group); (B) a silicone resin having a vinyl group bonded to silicon atom (as Si—CH?CH2 group); and (C) a platinum catalyst, wherein the total amount of silanol (Si—OH) group in the components (A) and (B) is 0.5 to 5.0 mmol/g; and wherein the amount of platinum in the component (C) relative to the total mass of the components (A), (B) and (C) is 0.003 to 3.0 ppm in mass units. A cured product obtained by heating the composition is suitably usable as an encapsulant of an optical semiconductor device.

Abstract: Disclosed is a curable composition including a silicone (A) of a specific structure and a composition containing Si—OH group and Si—H group, a silicone (B) of a specific structure and a composition containing Si—OH group and Si—CH?CH2 group, and a hydrosilylation catalyst of a catalytic quantity containing at least one metal compound selected from the group consisting of platinum compounds, palladium compounds, and rhodium compounds. In this curable composition, as kind of each silicone and the content of Si—OH group are adjusted, in curing the silicone, foaming in a cured product can be inhibited by inhibiting a dehydration condensation reaction between Si—OH groups, as compared with a hydrosilylation reaction which is a reaction of Si—CH?CH2 group and Si—H group. Furthermore, an excellent adhesion to a base body such as semiconductor substrate can be given when making a cured film.

Abstract: Disclosed is a curable composition including a silicone (A) of a specific structure and a composition containing Si—OH group and Si—H group, a silicone (B) of a specific structure and a composition containing Si—OH group and Si—CH?CH2 group, and a hydrosilylation catalyst of a catalytic quantity containing at least one metal compound selected from the group consisting of platinum compounds, palladium compounds, and rhodium compounds. In this curable composition, as kind of each silicone and the content of Si—OH group are adjusted, in curing the silicone, foaming in a cured product can be inhibited by inhibiting a dehydration condensation reaction between Si—OH groups, as compared with a hydrosilylation reaction which is a reaction of Si—CH?CH2 group and Si—H group. Furthermore, an excellent adhesion to a base body such as semiconductor substrate can be given when making a cured film.

Abstract: A composition containing a metal compound and a siloxane compound (A) represented by general formula (1): wherein X is represented by general formula X1 or X2: wherein the number of X1 is 1-8; the number of X2 is 0-7; the sum of the number of X1 and the number of X2 is 8; R1 to R4 represent a hydrogen atom, a C1-8 alkyl group, alkenyl group, alkynyl group, or a C6-8 aryl group, a hydrogen atom thereof optionally being substituted by a fluorine atom; R5 represents a C1-18 alkyl group, alkenyl group, alkynyl group or aryl group, a hydrogen atom thereof being optionally substituted by a fluorine atom, a carbon atom being optionally substituted by an oxygen atom or a nitrogen atom; R6 represents a hydrogen atom, a vinyl group or an allyl group; m and n represent an integer of 1-4; and 3?m+n.

Abstract: A composition containing a metal compound and a siloxane compound (A) represented by general formula (1): wherein X is represented by general formula X1 or X2: wherein the number of X1 is 1-8; the number of X2 is 0-7; the sum of the number of X1 and the number of X2 is 8; R1 to R4 represent a hydrogen atom, a C1-8 alkyl group, alkenyl group, alkynyl group, or a C6-8 aryl group, a hydrogen atom thereof optionally being substituted by a fluorine atom; R5 represents a C1-18 alkyl group, alkenyl group, alkynyl group or aryl group, a hydrogen atom thereof being optionally substituted by a fluorine atom, a carbon atom being optionally substituted by an oxygen atom or a nitrogen atom; R6 represents a hydrogen atom, a vinyl group or an allyl group; m and n represent an integer of 1-4; and 3?m+n.