POLYPROPYLENE RESIN FOR SYRINGE, SYRINGE OBTAINED BY USING THE SAME AS RAW MATERIAL, AND PRE-FILLED SYRINGE PREPARATION

摘要

It is intended to provide a polypropylene resin for a syringe which is used as a raw material for a syringe excellent in hygienic aspect, heat resistance, and transparency, and with little elution of low-molecular-weight substances, and satisfies all of the prevention of bubble generation during molding, long-run moldability, and scratch prevention when a product is removed from a core mold during injection molding to a level which could not be achieved conventionally. The polypropylene resin for a syringe of the invention is characterized by comprising an ethylene-propylene block copolymer which has a melt flow rate (ASTM D 1238, 230°C, load of 2.16 kg) of 10 to 60 g/10 min and is formed of 85 to 97% by weight of n-decane-insoluble portion at room temperature (D) and 3 to 15% by weight of n-decane-soluble portion at room temperature (D) (provided that the total of Dand Dis 100% by weight) and in which Dand Dsatisfy a specific requirement.