Comb-Star Viscosity Modifier and Its Compositions

A comb-star poly(siloxane-polyolefin) comprising the reaction product of at least vinyl-terminated macromer and functional-poly(dialkylsiloxanes) comprising compounds of the following formula:

• wherein n and m are integers from 2 to 200;
• each of R1, R2 and R3 are independently selected from C1 to C20 alkyls;
• and X is a functional group capable of facilitating the formation of a bond between the vinyl group of the vinyl-terminated macromer and a silicon atom;
• and
• wherein the comb-star poly(siloxane-polyolefin) has the following features:
• a g′(vis avg) of less than 0.80;
• a comb number of 2 or more;
• and
• a number average molecular weight (Mn) within the range of from 25,000 g/mole to 500,000 g/mole.