A branched polysiloxane styrene butadiene polymer of the following formula ##STR1## wherein m is a number of from about 2 to about 10; z is the number 3,4 or 5; n is a number of from about 10 to about 1,000; k, l and o are weight fraction numbers with k being from about 0.35 to about 0.95, l being from 0.1 to about 0.2, and o is from about 0.05 to about 0.5; R is an aromatic substituent, alkyl-CR"C(O)O, and alkylene-CR"C(O)O, wherein R" is hydrogen or an alkyl substituent, and R' is an alkyl substituent or a trialkylsilylether substituent.
以下是式子:##STR1##
其中m的数值在2到10之间;z的数值为3、4或5;n的数值在10到1,000之间;k、l和o是重量分数,其中k的数值在0.35到0.95之间,l的数值在0.1到0.2之间,o的数值在0.05到0.5之间;R是芳香族取代基、烷基-CR"C(O)O,以及烷基-CR"C(O)O,其中R"是氢或烷基取代基,而R'是烷基取代基或三烷基
硅醚取代基。