| 摘要 |
An uncrosslinked thermoplastic elastomer composition comprising: (A) 35-95% by weight of a 1,2-polybutadiene having a 1,2-configuration content of 70% or more, a crystallinity of 5-40% by weight and [ eta ] of 0.7 dl/g or more as measured at 30 DEG C. in toluene, (B) 1-20% by weight of an isobutylene polymer or an isobutylene-isoprene copolymer (preferably having a degree of unsaturation of 0-5 mole % and a viscosity average molecular weight of 7,000-80,000), (C) 5-40% by weight of a polybutadiene rubber having a 1,4-configuration content of 80% or more and (D) 0-30% by weight, preferably 5-30% by weight, of at least one member selected from the group consisting of isoprene rubber, natural rubber, acrylonitrile-butadiene rubber, styrene-butadiene rubber and ethylene-propylene type rubbers, wherein, preferably, (B)/{(C)+(D)}=2/1-1/20. Said composition is rich in flexibility, excellent in abrasion resistance, adhesiveness, paint-compatibility, low temperature characteristics and snappiness as well as in moldability and processability, and easy to foam.
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