Sekisui Chemical Co., Ltd.

Sekisui Kagaku Kogyo Kabushiki Kaisha

Masao Ogasa

Koichi Shibayama

Toshihiro Arai

Kouichi Shibayama

Kiyomi Uenomachi

Masao Suzuki

Hironori Tabata

Hideshi Matsumoto

Eiichi Takahashi

Kenji Iuchi

Process for preparing polymer by using copper compound

A plastic foam material composed of a polyolefin based resin composition, consists essentially of specified amounts of polypropylene based resins and polyethylene based resins, included from about 20 to about 65 weight percent of a cross linked portion. The cross linked portion consists of from about 55 to about 95 weight percent of a cross linked polypropylene and from about 5 to about 45 weight percent of cross linked polyethylene. The amount of cross-linkage can be determined by a xylene extraction technique. The plastic foam material may further include specified amounts of a cross-linking agent and specified amounts of an organic thermodecomposition foaming agent. The thermodecomposition foaming agent decomposes at sufficiently high temperatures to yield a plastic foam material, which exhibits superior adherence properties and fewer deformities of its surface exemplified by swelling, shrinkage and wrinkling of its surface. A method to produce the plastic foam material is also disclosed.

Plastic foam material composed of a polyolefin based resin composition

A film for a first-aid sticking plaster consisting of polypropylene resin having a weight average molecular weight within a range of 80,000 to 500,000, with resin elution quantities according to cross fractionation chromatograph in ranges of 45 to 80 percent by weight at 0.degree. to 10.degree. C., 5 to 35 percent by weight at 10.degree. to 70.degree. C., 1 to 30 percent by weight at 70.degree. to 95.degree. C., and 5 to 35 percent by weight at 95.degree. to 125.degree. C.

Film for first-aid sticking plaster

The invention provides an expandable polyolefin resin composition comprising (a) 40 to 100 wt. % of a polypropylene resin having a melt index of 0.5 to 12, (b) 0 to 60 wt. % of a polyethylene resin having a melt index of 2 to 50 (c) 0.5 to 10 parts by weight of the di(meth)acrylate of an aliphatic dihydric alcohol having a methylene group with 2 to 18 carbon atoms between the (meth)acryloyloxy groups at both ends per 100 parts by weight of the combination of the resins (a) and (b), and (d) 1 to 50 parts by weight of a thermally decomposable blowing agent. Preferably the composition further comprises (e) 0.5 to 5 parts by weight of a monofunctional monomer. When uniformly crosslinked, the composition affords an expandable polyolefin resin composition suited to production of a crosslinked polyolefin resin foam excellent in heat resistance, toughness and moldability of formability and appearing homogeneous.

Expandable polyolefin resin compositions

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Takatsuki, Japan

Masao Ogasa