Patent ID: 8664347

Claim:
A silicone-polyether block copolymer having the average formula: R 4 R 1 2 Si(OR 5 2 Si) m {[R 2 O(C q H 2q O) p R 2 R 1 2 Si(OR 5 2 Si) k ] n R 2 O(C q H 2q O) p R 2 R 1 2 Si(OR 5 2 Si) m } h OSiR 1 2 R 4 , wherein R 1 is C 1 -C 10 hydrocarbyl; R 2 is C 1 -C 10 hydrocarbylene; R 3 is R 1 or H; R 4 is —R 2 —NR 3 2 or —R 2 —NR 3 —R 2 —NR 3 2 ; R 5 is R 1 or R 4 ; h is from 1 to 100; k is from 2 to 500; m is from 2 to 500; n is from 0 to 30; p is from 2 to 120; and q is from 2 to 4; wherein the copolymer contains per molecule an average of at least one R 5 group for which R 5 is —R 2 —NR 3 2 or —R 2 —NR 3 —R 2 —NR 3 2 .