| 摘要 |
<p>The present invention concerns a polymer composition comprising: a block copolymer (a) including a polymer block A, which is composed mainly of an alpha -methylstyrene, and a hydrogenated or unhydrogenated polymer block B, which is composed of a conjugated diene or isobutylene and has a weight average molecular weight of 30,000 to 200,000; an acrylic resin (b); and a softener (c), wherein proportions (by mass) of the respective components in the polymer composition are such that each of the following relationships (1) and (2) holds: <DF NUM="(1)">0.05 </= Wb/Wa </= 2 </DF> and <DF NUM="(2)">Wc/(Wa + Wb + Wc) </= 0.5 </DF> wherein Wa, Wb, and Wc represent amounts (by mass) of the block copolymer (a), the acrylic resin (b) and the softener (c), respectively. <??>The polymer composition obtainable in accordance with the present invention is favorable in terms of such physical properties as formability, scratch resistance, abrasion resistance, flexibility, mechanical strength, rubber elasticity, and transparency and exhibits these properties in a well-balanced manner. By exploiting these favorable properties, the polymer composition can be effectively used in a wide range of applications, including stretchable materials, laminates, and foams.</p> |
