| 摘要 |
<p>A thermoplastic polymer composition comprises 100 parts by weight of polypropylene, 5 to 100 parts by weight of a hydrogenated block copolymer which has at least one block A and at least one block B , or has at least one block A, at least one block B and at least one block C each indicated below and which has a number average molecular weight of not higher than 700,000, and the block C consists essentially of a polymer of isoprene and butadiene at a ratio by weight of 0:100 to 100:0 and has a number average molecular weight of not higher than 200,000 and a vinyl bond content of not less than 40%, and 0 to 100 parts by weight of an ethylene/propylene rubber. Block A: a butadiene polymer having a number average molecular weight of 2,500 to 200,000 and a vinyl bond content of not higher than 20% Block B: a polymer of isoprene and butadiene at a ratio by weight of 30:70 to 100:0 and has a number average molecular weight of 30,000 to 300,000 and a vinyl bond content of not higher than 20% Block C: a polymer of isoprene and butadiene at a ratio by weight of 0:100 to 100:0 and has a number average molecular weight of not higher than 200,000 and a vinyl bond content of not less than 40%.</p> |
