| 摘要 |
PURPOSE:The titled composition capable of improving rigidity, heat resistance, etc. without lowering transparency of styrene-butadiene block copolymer, obtained by blending a styrene-methacrylate copolymer with a radiately branched block copolymer. CONSTITUTION:90-30wt%, preferably 85-40wt% radiately branched block copolymer shown by the formula (A-B)xY(A is polymer block of vinyl aromatic hydrocarbon; B is polymer block of conjugated diene; Y is residue of polyfunctional coupling agent to be used for formation of radiate polymer; x is number of polyfunctional group of coupling agent; n>=3), preferably consisting of 60-90wt% ingredient A, 40-60wt% ingredient B, and a small amount of rubber, is blended with 10-70wt% styrene-methacrylate copolymer (not more than 40wt% methacrylate). Copolymers whose difference of refractive indexes is not more than + or -0.003 are used. |
