Mitsui Petrochemical Industries, Ltd.

Masaya Yamada

Mamoru Kioka

Masaki Kohyama

Tetsunori Shinozaki

Akinori Toyota

Takashi Ueda

Masao Nakano

Hideki Sakai

Seiichi Ikeyama

Yoshinori Akana

Masanobu Ishiyama

Michio Toriumi

Yasuo Futami

Kenji Iwata

Kazumitsu Kawakita

Tsuneo Yashiki

Hiroshi Nishikawa

Satoshi Matsumoto

Disclosed are a polypropylene resin composition comprising a crystalline polypropylene having a high stereoregularity and a terpene resin and a petroleum resin each having no polar group; a polypropylene stretched film formed from the polypropylene resin composition; and a polypropylene multi-layer stretched film having a base layer formed from the polypropylene resin composition and a surface layer formed from a polypropylene type polymer. The polypropylene stretched film and a polypropylene multi-layer stretched film have excellent water-vapor barrier properties and transparency, and a high Young's modulus. Further, disclosed are a polypropylene resin composition comprising a crystalline polypropylene having a high stereoregularity and a hydrogenated petroleum resin; a PTP packaging polypropylene sheet formed from the polypropylene resin composition; and a PTP packaging polypropylene multi-layer sheet having a base layer formed from the polypropylene resin composition and a surface layer formed from a propylene type polymer, wherein the proportion of the thickness of the base layer to the total thickness of the sheet is more than 50%, and the total thickness of the sheet and the proportion of the thickness of the base layer satisfy the specific relationship. The PTP packaging polypropylene sheet and the PTP packaging polypropylene multi-layer sheet have excellent water-vapor barrier properties and transparency, and a high rigidity.

Polypropylene resin composition and the use of the same

Disclosed are a polypropylene resin composition comprising a crystalline polypropylene having a high stereoregularity and a terpene resin and a petroleum resin each having no polar group; a polypropylene stretched film formed from the polypropylene resin composition; and a polypropylene multi-layer stretched film having a base layer formed from the polypropylene resin composition and surface layer formed from a polypropylene type polymer. The polypropylene stretched film and a polypropylene multi-layer stretched film have excellent water-vapor barrier properties and transparency, and a high Young's modulus. Further, disclosed are a polypropylene resin composition comprising a crystalline polypropylene having a high stereoregularity and a hydrogenated petroleum resin; a PTP packaging polypropylene sheet formed from the polypropylene resin composition; and a PTP packaging polypropylene multi-layer sheet having a base layer formed from the polypropylene resin composition and a surface layer formed from a propylene type polymer, wherein the proportion of the thickness of the base layer to the total thickness of the sheet is more than 50%, and the total thickness of the shoot and the proportion of the thickness of the base layer satisfy the specific relationship. The PTP packaging polypropylene sheet and the PTP packaging polypropylene multi-layer sheet have excellent water-vapor barrier properties and transparency, and a high rigidity.

The present invention relates to a novel ethylene/pentene-1 copolymer whose molded film has a good balance between impact resistance and tear properties and high transparency, also is prominently reduced in a variation of the transparency even after subjected to a heat treatment, and further shows high blocking resistance, provided that the copolymer fulfills specific requisites. The invention also relates to a process for the preparation of the above-mentioned ethylene/pentene-1 copolymer and a formulation of the ethylene/pentene-1 copolymer composition using a stabilizer. According to the invention, there can be obtained an ethylene/pentene-1 copolymer composition which is excellent in heat stability in the molding stage, long-term heat stability and weatherability.

Ethylene/pentene-1 copolymer and ethylene/pentene-1 copolymer composition

Ethylene/pentene-1 copolymer, and ethylene/pentene-1 copolymer

A process for producing polypropylene, which comprises preliminarily polymerizing 3-methylbutene-1 in the presence of a catalyst system formed from

Process for producing polypropylene and stretched polypropylene film

The ethylene/pentene-1 copolymer composition of the present invention comprises an ethylene/pentene-1 copolymer satisfying specific requests, and a high-pressure polyethylene, polyethylene having a density of greater than 0.935 or low crystalline .alpha.-olefin random copolymer. This composition is excellent in transparency, moldability, heat sealing property at low temperature and tear property, and are particularly useful for packaging film material.

Ethylene/pentene-1 copolymer compositions and their use

The ethylene/pentene-1 copolymer composition comprises an ethylene/pentene-1 copolymer satisfying specific request and an ethylene/vinyl acetate copolymer. This composition has excellent balance between impact resistance and tear properties, excellent transparency and good hot tack properties, and are particularly useful for packing films.

Ethylene/pentene-1 copolymer compositions

A process for producing polypropylene, which comprises preliminarily polymerizing 3-methylbuten3-1 in the presence of a catalyst system formed from

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Ichihara, Japan

Masaya Yamada