Patent ID: 8258243

Claim:
A grafted silicone polymer comprising a polymerization product of (a) a mercapto-modified silicone polymer represented by general formula (2) where m represents an integer of 10-540 and n represents an integer of 1 or greater, and (b) a radically polymerizable monomer component comprising (meth)acrylic acid and/or a (meth)acrylic acid alkyl ester, selected so that the solubility parameter of a polymer obtained only from the radically polymerizable monomer component is at least 9.14 (cal/cm 3 ) 1/2 , wherein the grafted silicone polymer has a elastic storage modulus of 1×10 5 Pa or greater at 37° C., 1 Hz and dissolves in decamethylcyclopentasiloxane (DMCPS) in an amount of 1 weight percent or greater at 23° C., and wherein said graft silicone polymer is obtained by polymerizing a mercapto-modified silicone polymer (MMSP) represented by general formula (2), methyl methacrylate (MMA) and methyl acrylate (MA), and has a composition in the range defined by (MMSP)/(MMA)/(MA)=63.7/36.3/0.0 (MMSP)/(MMA)/(MA)=46.2/26.9/26.9 (MMSP)/(MMA)/(MA)=46.2/7.6/46.2 (MMSP)/(MMA)/(MA)=63.7/7.6/28.7 (MMSP)/(MMA)/(MA)=63.7/25.9/10.4 (MMSP)/(MMA)/(MA)=71.2/29.8/0.0 in the ternary phase diagram shown in FIG. 1 .