Toray Industries, Inc.

Tokyo Printing Ink Mfg. Co., Ltd.

Toshihiro Yamane

Toshiya Yoshii

Katsuhiro Tsuchiya

Kenzi Ohashi

Toshiharu Sakaguchi

Yasuo Saito

Electro-conductive thermoplastic resin foam and preparation process

This invention relates to a three-layered polypropylene film consisting of a core layer of biaxially oriented polypropylene sandwiched between ethylene-propylene copolymer layers having a different degree of molecular orientation, shown by birefringence, i.e., birefringence of one copolymer layer is different from that of the other copolymer layer. The film thus prepared has not only a good heat sealing property but also a good resistance against 'hot-tack', 'blocking', and 'scratches'. The film can be provided by a process wherein one copolymer layer is biaxially stretched, while the other copolymer layer is uniaxially stretched. Three-layered films of this invention are particularly suited for making bags with lap sealed parts, where lap sealing is a heat sealing method characterized by heat sealing one side of a film with the other side of the film.

Three-layered polypropylene films

A polypropylene film laminate is made by laminating at least one side of a polypropylene layer comprising 1 -8 wt. % ionomer with an ionomer layer. This film is produced by coextruding polymers from a die, and is useful for automatic packaging applications at high speed.

Heatsealable polypropylene film laminate

Growing community of inventors

Otsu, Japan

Toshihiro Yamane