Patent ID: 11685812

Abstract:
A composition contains an organopolysiloxane having the following average chemical structure: X3SiO—SiR2—R′—(R2SiO)x—R2Si—[Rb—(R2SiO)y—R2Si—Rb′—(R2SiO)z—R2Si]m—R′—R2SiO—SiX3; where X is —OSiR2—R′—R2SiO—R2Si—R″-A; R is an alkyl group having from 2 to 6 carbons and aryl groups; R′, R″, Rb and Rb′ are divalent hydrocarbon groups comprising a chain of 2 to 6 methylene units; A is acrylate, methacrylate or trialkoxysilyl; provided that, on average, 60 to 90 mole-percent of the A groups are acrylate and methacrylate; Subscript m has an average value in a range of zero to 10; Subscripts x, y and z each has an average value in a range of zero to 1200; and provided that the average values of m, x, y and z are such that the sum of the average values for x, y and z is in a range of 300-1200 and the molar ratio of methylene units to siloxane units is less than 0.15.