| abstract |
(57) [Summary] [Objective] A polydimethylsiloxane having both low-reactivity end groups and high-reactivity end groups. Compositions These polydimethylsiloxanes are useful for making sealants with reduced modulus. Examples of these polydimethylsiloxanes have the formula XR 2 SiO- (wherein, X is methoxy or methylethylketoximo, R is methyl or vinyl) are those having low reactivity endgroups of further formula Y b R (3-b) SiO- (Wherein b is 2 or 3, R is a methyl group, and each Y is a hydrolyzable group selected from the group consisting of a ketoximo group and methoxy). . |