Idemitsu Petrochemical Co., Ltd.

Yoshikazu Shirai

Masao Takashige

Kenichi Tanaka

Each base for fusing a snap-zipper male member and a snap-zipper female member, which form a snap zipper, onto a bag body is formed from a mixture of polypropylene and an ethylene copolymer obtained by copolymerizing ethylene and an .alpha.-olefin having a carbon atom ratio of 3 to 20, in which the ethylene copolymer has a weight average molecular weight/number average molecular weight of less than 3, density in the range from 0.850 g/cm.sup.3 to 0.935 g/cm.sup.3, melt index in the range from 0.3 g/10 min. to 15 g/10 min., and range of number of branching dependent on molecular weight of 0-5 branches/1,000 carbon. A bag with the snap zipper is structured to fuse the snap zipper through the bases onto the bag body.

Growing community of inventors

Himeji, Japan

Yoshikazu Shirai