Mitsubishi Petrochemical Company Limited

Mitsubishi Chemical Corporation

Masafumi Hattori

Takayuki Inoue

Kazuhide Hayama

Masahide Ochiumi

Junji Mayumi

Etsushi Akashige

Chikako Ikeda

Tomomi Nakano

Masayuki Egami

Riichiro Maruta

Hitoshi Yamada

Tatsuoki Saito

Satoru Sugimoto

Akira Mizuno

An olefin resin-based article having good gas barrier properties is disclosed, comprising an .alpha.,.beta.-ethylenically unsaturated carboxylic acid-grafted polyolefin (e.g., maleic anhydride-grafted polypropylene) having formed thereon an inorganic oxide deposite film, wherein the grafted polyolefin has an unsaturated carboxylic acid unit concentration of from 0.01 to 10% by weight, with or without an anchor coat being provided between the grafted polyolefin and the inorganic oxide film. The article suffers from no reduction in gas barrier properties even when heat or stress is applied thereto and is therefore useful as a wrapping or packaging material in the production of pouch-packed foods and IC packages.

Olefin resin-based articles having gas barrier properties

The invention relates to an adhesive resin composition comprising an ethylene polymer having a melting point of 70 to 132.degree. C., a density of 0.88 to 0.94% g/cm.sup.3 and a melt flow rate (MFR) of 0.05 to 50 g/10 min. and/or a modified product thereof with an unsaturated carboxylic acid or its derivative (component A); a tackifier (component B); and a block copolymer containing at least one polymer block mainly composed of a vinyl aromatic hydrocarbon and at least one polymer block mainly composed of a conjugated diene or a hydrogenated product thereof (component C). This composition is useful as an adhesives showing excellent adhesion over a wide temperature range as well as processability by film molding, sheet molding, blow molding, etc. It is available for laminates comprising various kinds of resins such as polyolefins, styrenic resins, polyesters, acrylic resins and polyamides.

Adhesive resin composition

A transparent resin composition is described, comprising (i) from 65 to 99.9 parts by weight of a modified polyolefin which is at least partially modified with an unsaturated carboxylic acid or the anhydride thereof and having an unsaturated carboxylic acid or anhydride content of from 0.002 to 5 wt %, (2) from 35 to 0.1 parts by weight of a saponified ethylene/vinyl acetate copolymer having an ethylene content of from 25 to 75 mol % and a degree of saponification of at least 96%, and (3) from 0.5 to 200 parts by weight per 100 parts by weight of the copolymer (2) of a plasticizer. Molded articles of the resin composition have excellent transparency, moldability, mechanical strength, moisture barrier property, etc. The resin composition can be easily prepared from trimming wastes, wastes of extrusion or the like of multi-layered articles.

Multi-layered laminate

A multi-layer laminated structure comprising a polycarbonate or thermoplastic polyester layer having adjacently adhered thereto a layer comprised of a modified olefin polymer having a stiffness modulus of from 100 to 3,000 Kg/cm.sup.2 and a degree of crystallinity of not more than 33%, in which an unsaturated carboxylic acid or the derivative thereof is grafted to at least a part of a polymer consisting of a hydrocarbon. The laminated structure is excellent in moisture impermeability, oxygen barrier property, adhesion durability under a high temperature and high humidity condition, moldability, processability, and the like, and is useful as a packaging material.

Multi-layer laminated structure

A process of purifying maleic anhydride graft polyolefin comprising the steps of adding an aqueous solution of alkali initial hydroxide to a solution of maleic anhydride graft polyolefin containing unreacted maleic anhydride which is dissolved in an organic solvent at a temperature from 80.degree. C. to 160.degree. C., thereby precipitating maleic anhydride graft polyolefin particles to make a W/O emulsion; stirring the W/O emulsion while maintaining the temperature at a same temperature as above for less than 2 hours, thereby selectively forming the alkali metal salt of unreacted maleic anhydride; adding the aqueous solution of alkali metal hydroxide to the W/O emulsion to convert the W/O emulsion into an O/W emulsion; separating the maleic anhydride draft polyolefin particles, and washing the maleic anhydride graft polyolefin particles with water.

Process of purifying maleic anhydride-modified polyolefin

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Mie, Japan

Masafumi Hattori