Radically polymerizable polycaprolactone-modified silicone compound, novel silicone-polycaprolactone copolymer particles and cosmetic composition using same, and other uses

A radical polymerizable polycaprolactone-modified silicone compound, comprising:

• two or more modified polycaprolactone structures bonded to a silicon atom either directly or via a divalent linking group, the structures expressed by the following structural formula (1):
• where n is a number ranging from 1 to 5;
• Ra is a group selected from hydrogen atoms and (meth)acrylic terminal groups expressed by —R1—CR2═CH2 where R1 is a carbonyl group or a divalent linking group containing one carbonyl group, and R2 is a hydrogen atom or a methyl group;
• and if the number of (meth)acrylic terminal groups contained in the modified polycaprolactone structure in the molecule is less than two, the molecule further includes two or more (meth)acrylic terminal groups expressed by —R3—CR4═CH2 and bonded to silicon atoms, where R3 is a carbonyl group or a divalent linking group containing one carbonyl group, and R4 is a hydrogen atom or a methyl group.