| 摘要 |
PURPOSE:To obtain the subject composition excellent in but processing stability and thermal discoloration resistance during high-temperature molding and NOx discoloration resistance, wet-heat discoloration resistance and gamma-ray discoloration resistance during service by mixing a styrene/butadiene block copolymer with a specified phenol compound and a phosphorous antioxidant. CONSTITUTION:A styrene/butadiene block copolymer of a styrene/butadiene weight ratio of 60:40 to 95:5 is mixed with 2-t-amyl-6-[1-(3,5-di-t-amyl-2- hydroxyphenyl)ethyl-4-t-amylphenol acrylate] and a phosphorous antioxidant [e.g. tris(2,4-di-t-butylphenyl) phosphite]. |
