COMPOSITIONS CONTAINING STYRENE-ISOBUTYLENE-STYRENE AND STYRENE-ETHYLENE/BUTYLENE-STYRENE BLOCK COPOLYMERS

摘要

The present invention is a hydrogenated styrenic block copolymer to retain at least one block A and one block B and from about 10% to about 90% by weight of a styrene-isobutylene-provides a composition comprising a styrene block copolymer. Each A is a mono alkenyl arene, and each B block is a general formula A-EB / AA, and (A-EB / A) one or more mono alkenyl arene and a controlled distribution copolymer of at least one conjugated diene represented by nX. Each B block is a conjugated diene unit-rich, A-terminal region and is a mono alkenyl arene units in the block adjacent to rich, that are not adjacent to the A block comprises one or more regions. Low gas permeability, low thermal conductivity and strong vibration and sound damping properties and, if appropriate while maintaining a melt flow rate in accordance with the ease of processability to provide a high level of light transmittance haze value combined with a relatively low oil-free composition provides a