For example a silicone di-hydride can be reacted with an ethylenically unsaturated ester such as, for example, where C(O) represents a carbonyl group and n is an integer up to 15, and R is an alkyl, aryl or substituted aryl group, to yield a silicone chain capped with -Si-(CH 2 ) n+ 2-C(O)-OR. The -C(O)-OR group is a carboxylic acid derivative which can be reacted with a silicone diamine, a polyam