Mitsui Toatsu Chemicals, Incorporated

Honda Giken Kogyo Kabushiki Kaisha

Mitsui Chemicals, Inc.

Katsuyuki Nitta

Keigo Suehiro

Takeaki Inokuma

Yoichi Kawai

Katsumi Sekiguchi

Kenji Hamabe

Osamu Aoki

Atsushi Takeuchi

Yoshiyasu Kamiya

Chihiro Ogawa

Takashi Miyazaki

Sachio Yokote

Herein provided are a polypropylene resin composition which comprises (A) a polypropylene, (B) an ethylene-propylene-diene terpolymeric rubber having a Mooney viscosity, ML.sub.1+4 (100.degree. C.), ranging from 5 to 50 and an iodine value of not less than 15, the content of the component (B) ranging from 10 to 50% by weight on the basis of the total weight of the components (A) and (B), and optionally (C) an inorganic filler in an amount ranging from 0 to 40 parts by weight per 100 parts by weight of the sum of the components (A) and (B); a coating method which comprises the steps of applying a primer coating to a molded product obtained by molding the foregoing polypropylene resin composition or irradiating the molded product with plasma without degreasing and washing the product with a halogen atom-containing organic solvent and then applying a top coat to the product; and a coating method which comprises the steps of degreasing and washing a molded product obtained by molding the foregoing polypropylene resin composition and then applying a top coat to the product without applying a primer coating to the molded product or irradiating the molded product with plasma. The coated film obtained according to the foregoing methods has good bond strength to the molded product.

Polypropylene resin composition and method for coating molded products

A polypropylene resin composition which comprises (A) 100 parts by weight of polypropylene, (B) 20-50 parts by weight of at least one elastomer selected from an ethylenic elastomer, an hydrogenated styrene-butadiene copolymer and a hydrogenated styrene-isoprene block copolymer, (C) 0.3.about.20 parts by weight of polycarbonatediol having a skeleton of aliphatic carbonate with both terminals being a hydroxyl group and (D) 0.about.50 parts by weight of an inorganic filler. The resin composition can provide a molded article having a good adhesive property to a film applied thereon without pretreatment by a halogen-containing solvent.

Polypropylene resin compositions, coating process for moldings thereof

A coated molded article having good adhesion to a coating film and resistance to gasohol as well as excellent appearance can be obtained by applying a primer coating to the surface of a molded article or irradiating the surface with plasma without applying any washing-treatment with a halogen atom-containing organic solvent and then applying a top coat onto the article, if the molded article is formed from a resin composition comprising (A)a polypropylene; (B)a specific ethylene-propylene-diene terpolymer rubber; (C) a specific ethylene-propylene copolymer rubber; and (D) a specific polyhydroxypolyolefin, the amounts of these components (A) to (D) satisfying the following relations:

The present invention relates to a polypropylene composition useful as an adhesive comprising a modified polypropylene resin graft-modified with from about 0.01 wt. % to about 2 wt. % of a radical-polymerizable unsaturated compound and a crystalline propylene/ethylene block copolymer containing from about 10 wt. % to about 50 wt. % of a propylene/ethylene random copolymer having an ethylene content of from about 20 wt. % to about 90 wt. %. The resin composition is particularly suitable for bonding a polypropylene resin layer and an ethylene/vinyl alcohol copolymer layer, and a polypropylene resin layer and a polyamide resin layer.

Polypropylene composition

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Kanagawa, Japan

Katsuyuki Nitta