DIENE TRIBLOCK POLYMERS WITH STYRENE-ALPHA-METHYLSTYRENE COPOLYMERS AS END BLOCKS.

Abstract

Triblock polymers and radial block copolymers of styrene and butadiene or isoprene are successful commercial thermoplastic elastomers pioneered by the Shell Chemical Company and the Phillips Petroleum Company. The low diene and high styrene block polymers are clear impact resisting plastics marketed by the Phillips Petroleum Company under the trade name K-Resins. One common deficiency of these polymers is the relatively low glass temperature (Tg) of the polystyrene endblocks. In this paper we describe the preparation an properties of another triblock with endblocks of higher Tg.