| 摘要 |
PROBLEM TO BE SOLVED: To improve heat-discoloration-coloring resistance or the like by blending 2,4-di-t-amyl-6-[1-(3,5-di-t-amyl-2-hydroxyphenyl)ethyl]phenyl acrylate with a styrene-butadiene block copolymer whose styrene quantity is set to a specific quantity. SOLUTION: A packing material for a medical appliance is manufactured from a material by blending 2,4-di-t-amyl-6-[1-(3,5-di-t-amyl-2-hydoxyphenyl) ethyl]phenyl acrylate with a styrene-butadiene block copolymer on which a styren quantity to the total quantity of styrene and butadiene is 5 to 60 wt.%. At the same time, a phenol type antioxidant, a phosphorus type antioxidant or the like are used at the same time, and heat resistant work stability at high temperature molding time is improved thereby. Pentaerythrityl tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate] or the like can be cited as a phenol type antioxidant. |
