Radiation-curable organopolysiloxane composition and a release sheet

A radiation-curable organopolysiloxane composition comprising the following components (A), (B) and (C):

• (A) organopolysiloxane represented by the following formula (1):
• wherein R1 is, independently of each other, a substituted or unsubstituted, monovalent hydrocarbon group having 1 to 10 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, a hydroxyl group, a hydroxyl group-containing organic group, or a (meth)acryloyl group-containing organic group, with at least one of R1 being a (meth)acryloyl group-containing organic group, a is an integer of 2 or more, b is an integer of 0 or more, c is an integer of 0 or more, d is an integer of 0 or more, a, b, c and d satisfy an equation, 2≤a+b+c+d≤1,000, and a ratio of the total number of the hydroxyl group and the hydroxyl group-containing organic group to the total number of the (meth)acryloyl group-containing organic group, the hydroxyl group and the hydroxyl group-containing organic group is 0.0001 to 0.4;
• (B) compound having two or more acrylic groups in one molecule in an amount of 0.1 to 50 parts by mass, relative to 100 parts by mass of component (A);
• wherein component (B) is at least one selected from the group consisting of
• an organosilane having two or more acrylic groups in one molecule optionally including a hydrolytic condensation product thereof;
• and
• a compound having two or more acrylic groups in one molecule that is selected from the group consisting of 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, 1,9-nonanediol diacrylate, 1,10-decanediol diacrylate, tricyclodecanedimethanol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, glycerinpropoxy triacrylate, pentaerythritol tetraacrylate, ditrimethylolpropane tetraacrylate, dipentaerythritol hexaacrylate, tripentaerythritol octaacrylate, propoxylated pentaerythritol tetraacrylate, and dipentaerythritol polyacrylate,
• (C) radical polymerization initiator in an amount of 0.1 to 15 parts by mass, relative to 100 parts by mass of component (A);
• and
• wherein the radiation-curable organopolysiloxane composition comprises no organopolysiloxane that is represented by the formula (1) and has a ratio of the total number of the hydroxyl group and the hydroxyl group-containing organic group to the total number of the (meth)acryloyl group-containing organic group, the hydroxyl group and the hydroxyl group-containing organic group being more than 0.4.