| 摘要 |
PURPOSE: To obtain a polyvinyl chloride sheet having radiation resistance useful for packing a tool for medical treatment, slightly changing in color with the lapse of a long period of time against radiation of cobalt 60-γrays and having a flex temperature free from problems during molding. CONSTITUTION: This polyvinyl chloride sheet having radiation resistance is obtained by blending 100 pts.wt. of a polyvinyl chloride with (a) pts. wt. of an organotin-based stabilizer and (b) pts.wt. of an epoxy-based stabilizing auxiliary so as to satisfy formulas 1<=(a)<=3, 3<=b<=8 and 1.1a+1.7b<=14 and has >=50 deg.C Clash-Berg flex temperature. 100 pts.wt. of a polyvinyl chloride is mixed with (a) pts.wt. of an organotin-based stabilizer and (b) pts.wt. of an epoxy-based stabilizing auxiliary and (c) pts.wt. of a glycerol fatty acid ester in a range to satisfy formulas 1<=(a)<=3, 3<=b<=8, 0<=c<=3 and 1.1a+1.7b+0.6c<=14 to give the objective radiationresistant polyvinyl chloride sheet having >=50 deg.C Clash-Berg flex temperature.
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