Patent ID: 8377860
Filing Date: 2013-02-19
Classification: C08F,C10M,C10N

Abstract:
1. A polymer comprising units represented by the formula and units represented by the formula wherein: R, R 1 , R 2 and R 3 are independently hydrocarbyl groups and R 2 and R 3 may independently also be hydrogen; one of X 1 and X 2 is S and the other of X 1 and X 2 is O; x is the number units represented by formula (I) in the polymer; y is the number of units represented by formula (II) in the polymer; the ratio of y to x being in the range from about 0.1 to about 20, the polymer having a weight average molecular weight in the range from about 5,000 to about 1,000,000, and wherein the polymer is a star polymer.