Maruzen Petrochemical Company, Limited

Chisso Corporation

Chisso Corporation & Maruzen Petrochemical Co., Ltd.

Kyoichiro Kimura

Suetou Hayashida

Kazuhiro Yamada

Tadao Ishibashi

Takashi Kuroda

Masaru Sameshima

Eiji Takahashi

The present invention relates a process to a process of producing an opacified molded product composed mainly of a polypropylene resin. More particularly, according to the present invention, there is provided a process of producing an opacified stretched molded product having a total light transmittance of 50% of less and a density of 0.89 or less including a composition including 100 parts by weight of polypropylene and 3 to 40 parts by weight of a cyclopentadiene petroleum resin and/or a hydrogeneated cyclopentadiene petroleum resin, the molded product being a product stretched in at least one direction. Also provided are methods of producing a resin composition comprising 100 parts by weight of a crystalline polypropylene and 30 to 40 parts by weight of a copolymer resin comprising a copolymer of a cyclopentadiene compound and an aromatic hydrocarbon or its hydrogenated product, and a stretched molded product thereof.

Process for producing an opacified molded product

The present invention relates to an opacified molded product composed mainly of a polypropylene resin. More particularly, according to the present invention, there are provided an opacified stretched molded product having a total light transmittance of 50% or less and a density of 0.89 or less comprising a composition comprising 100 parts by weight of polypropylene and 3 to 40 parts by weight of a cyclopentadiene petroleum resin and/or a hydrogenated cyclopentadiene petroleum resin, the molded product being a product stretched in at least one direction. Also provided are a resin composition comprising 100 parts by weight of a crystalline polypropylene and 30 to 40 parts by weight of a copolymer resin comprising a copolymer of a cyclopentadiene compound and an aromatic hydrocarbon or its hydrogenated product, a stretched molded product thereof.

Opacified molded product

Polypropylene resin compositions suitable for producing polypropylene films with excellent properties are disclosed. The compositions can provide polypropylene films having very excellent transparency, excellent heat-sealability and good anti-blocking property. Such characteristics are essential requirements for packing films. The polypropylene resin compositions comprise 70 to 99 parts by weight of polypropylene and 1 to 30 parts by weight of a specific hydrogenated petroleum resin. The hydrogenated petroleum resin can easily be prepared industrially from valueless by-products of oil and petrochemical industries, such as C.sub.5 fraction and C.sub.9 fraction by-produced in naphtha steam cracking process.

Polypropylene resin compositions

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Chiba, Japan

Kyoichiro Kimura