| 摘要 |
Polymeric compositions having improved environmental resistance comprising A. ABOUT 80 TO 90 PERCENT OF BLOCK COPOLYMERS HAVING AT LEAST TWO MONO ALPHA ALKENYL ARENE POLYMER BLOCKS AND AT LEAST ONE CONJUGATED DIENE POLYMER BLOCK AND B. ABOUT 20 TO 1 PERCENT OF A SELECTIVELY HYDROGENATED BLOCK COPOLYMER HAVING, PRIOR TO HYDROGENATION, AT LEAST ONE MONO ALPHA ALKENYL ARENE POLYMER BLOCK AND AT LEAST ONE CONJUGATED DIENE POLYMER BLOCK, SAID BLOCK COPOLYMER HAVING BEEN SELECTIVELY HYDROGENATED TO SATURATE AT LEAST 80 PERCENT OF THE OLEFINIC DOUBLE BONDS AND 0 TO 25 PERCENT OF THE AROMATIC DOUBLE BONDS. The compositions are thermoplastic elastomers.
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