PROBLEM TO BE SOLVED: To provide a medical vinyl chloride resin composition excellent in crack resistance and color fastness to radiation sterilization, especially γ ray sterilization, good in injection moldability, having no problem in a leachability test required for medical materials and therefore capable of being used for medical devices such as a medical infusion set, a joint member of a medical blood circuit and a medical hard container.SOLUTION: There is provided a medical vinyl chloride-based resin composition containing 100 pts.mass of (a) vinyl chloride-based resin and 1 pts.mass or more and less than 15 pts.mass of (b) cyclohexane-1,2-dicarboxylic acid di(isononyl)ester with a cis isomer of 90 to 100 mol% and a trans isomer of 10 to 0 mol%, obtained by hydrogenation of diisononyl phthalate ester of cas No.28553-12-0.SELECTED DRAWING: NoneCOPYRIGHT: (C)2016,JPO&INPIT【課題】放射線滅菌、特にγ線滅菌に対する耐亀裂性、耐変色性に優れ、射出成形性が良好であり、医療用材料に要求される溶出性試験において問題がなく、そのため医療用輸液セット、医療用血液回路のジョイント部材、及び医療用硬質容器などの医療用器具に好適に用いることのできる医療用塩化ビニル樹脂組成物を提供すること。【解決手段】(a)塩化ビニル系樹脂100質量部;及び(b)casNo.28553-12-0のフタル酸ジイソノニルエステルを水素添加して得られるシス異性体90~100モル%、トランス異性体10~0モル%のシクロヘキサン-1,2-ジカルボン酸ジ(イソノニル)エステル1質量部以上15質量部未満;を含むことを特徴とする医療用塩化ビニル系樹脂組成物。【選択図】なし
