Preparation of polyorganosiloxanes by interfacial polymerization

摘要

A process is disclosed for manufacturing high number average molecular weight polysiloxane copolymers by interfacial polymerization. These polysiloxanes contain phenylmethyl siloxane blocks and dimethyl siloxane blocks, alternately polymerized together to form an (A<Sub>m</Sub>B<Sub>n</Sub>)<Sub>x</Sub> type copolymer. Our interfacial polymerization process is fast, proceeds smoothly at room temperature and is not reversible, i.e., no cyclic siloxane species are generated. The polysiloxanes are formed as thermoplastic elastomers suitable for use as sealants, fillers and films.