Patent ID: 8895662

Claim:
A curable composition comprising: (A) a branched polymer having an average unit formula (I′): [(R″) 2 SiO 2/2 ] a″ [(CH 2 ═CH)(R″) 2 SiO 1/2 ] b″ [R″SiO 3/2 ] c″ [O 1/2 Si(R″) 2 (CH 2 CH 2 )(R″) 2 SiO 1/2 ] e″ (I′), wherein R″ is a substituted or unsubstituted mono-valent hydrocarbon group, each of R″ is the same with or different from each other, a″ is an integer ranging from 0 to 200, b″ is an integer ranging from 3 to 6, c″ is an integer ranging from 1 to 4, and e″ is an integer ranging from 2 to 200; (B) a branched organopolysiloxane having at least one silicon-bonded alkenyl group and having a siloxane unit of formula R 4 SiO 3/2 wherein R 4 is a substituted or unsubstituted mono-valent hydrocarbon group, and wherein the amount of component (B) is about 1 part by weight to about 9900 parts by weight, based on 100 parts by weight of component (A); (C) an organopolysiloxane having an average unit formula (II) being capped with H: (R 5 2 SiO 2/2 ) f (R 6 3 SiO 1/2 ) g (R 7 SiO 3/2 ) h (SiO 4/2 ) i (CH 2 CH 2 ) j (II); wherein R 5 , R 6 and R 7 are independently H or a substituted or unsubstituted mono-valent hydrocarbon group, wherein each of R 5 is the same with or different from each other, each of R 6 is the same with or different from each other, f>0, g>0, h≧0, i≧0, j≧0, and the amount of component (C) is about 1 parts by weight to about 300 parts by weight, based on 100 parts by weight of the total amount of components (A) and (B); and (D) a catalyst.