Takeda Chemical Industries, Inc.

Kuraray Co., Ltd.

Showa Aluminum Corporation

Masamitsu Nakabayashi

Yuzo Furukawa

Fumihiro Doura

Teruo Hori

Takuji Okaya

Yoshio Kamatani

Toshiyuki Akasawa

Reiji Miyamoto

Hideo Kawai

Tetsujiro Tatsumi

Masayuki Kaji

Masuo Miyaji

Taiji Morimoto

Akira Tashiro

Suminori Tatsukawa

A heat adherable resin composition which comprises (a) a carboxyl-modified resin obtained by the reaction of a partially saponified product of an ethylene-vinyl acetate copolymer having a vinyl acetate content of 10 to 55 weight percent with an unsaturated carboxylic acid or dicarboxylic acid anhydride and (b) a monoolefin-unsaturated carboxylic acid copolymer or metal salt thereof is valuable as an adhesive layer for the heat sealable sheet made of aluminum foil which is used in the food industry in sealing and packaging the mouths of glass containers.

Heat adherable resin compositions and aluminum sheet laminated with the

Laminated article and process for production thereof

A closure material for sealing glass containers comprising a metal foil and a thermally adhesive composition layer formed on one surface of the metal foil and comprising a carboxyl-modified saponified product of ethylene-vinyl acetate copolymer and up to 30 parts by weight of an inorganic compound per 100 parts by weight of the carboxyl-modified saponified product, the carboxyl-modified saponified product being prepared by graft-polymerizing a carboxylic acid group-containing unsaturated compound with a saponified product of ethylene-vinyl acetate copolymer containing 50 to 97 mole % of ethylene.

Closure material for sealing glass containers

Disclosed are a colorless and transparent carboxyl-modified resin of saponified ethylene-vinyl acetate copolymers prepared from an ethylene-vinyl acetate copolymer, the 1.0 mm-thick sheet therefrom having a total transmittance of more than 90%, a haze of less than 3% and a yellowness index of 3 and the preparation of the resin. The uses of the resin are also disclosed for laminated glass wherein the resin is used as an interlayer as well as for a solar cell module wherein the resin is used as a sealing material of a semiconductor element.

Resin from saponified ethylene-vinyl acetate copolymers, production and

Disclosed is an adhesive for bonding an ethylene/vinyl alcohol copolymer and polystyrene, which comprises a modified ethylene/vinyl acetate copolymer obtained by graft-copolymerizing a styrenic vinyl monomer and an .alpha.,.beta.-unsaturated carboxylic acid to an ethylene/vinyl acetate copolymer. A laminated article having the said adhesive as an interlayer and production thereof are also disclosed. The laminated article shows strong resistance to delamination and excels in processability. Therefore, the laminate is valuable as a deep-draw forming material with enhanced gas barrier properties for a preservation rigid container for foods.

Laminated article and production thereof

Disclosed is a primer composition which contains an isocyanate compound having one or more 1,3,5-oxadiazine-2,4,6-trione rings as an adhesion promoter, which is useful as a primer for bonding polyester plastics to the same or different substrates using an adhesive such as polyurethane, epoxy and polyolefin adhesives. When the surface of polyester plastics is treated with said primer prior to application of the adhesive, the bonding achieved is excellent in adhesion.

Primer for bonding polyester plastics

A thermosetting adhesive composition is disclosed which contains (a) a half-ester product of a saponified ethylene/vinyl ester copolymer with a dicarboxylic acid and (b) a solid or liquid epoxy resin, and this composition may further optionally contain a compound bearing two or more carboxyl groups, which is useful as a structural adhesive. The composition has a good storage stability and a good solubility to solvents, and can be cured at relatively low temperature in a shortened time. After curing, the composition shows good heat-resistance and has good adhesive properties.

Thermosetting adhesive compositions and use

A hot-melt adhesive composition containing (i) a first component consisting of (a) 20 to 100 weight percent of a hydrolyzed ethylene-vinyl acetate copolymer whose vinyl acetate unit content is in the range of 5 to 50 weight percent and its hydrolysis degree is at least 50 percent and/or a carboxyl-containing product obtained by grafting said copolymer with a carboxyl-containing unsaturated compound or anhydride thereof and (b) 0 to 80 weight percent of a resin compatible with said copolymer and/or said carboxyl-containing product and (ii) a second component which is a tackifying resin, the proportion of said first component being not less than 20 weight percent and that of said second component being not less than 20 weight percent, both based on said two components, and said composition optionally may further contain (iii) a wax as a third component is highly improved in adhesivity as compared with the hitherto known hot-melt adhesive compositions.

Hot-melt adhesive composition

A spherical powder of a hydrolyzed ethylene-vinyl acetate copolymer or its carboxyl modified product, is prepared by a method which comprises mixing 100 parts by weight of (1) a hydrolyzed product of an ethylene-vinyl acetate copolymer having 5 to 50% by weight of vinyl acetate group content or (2) a carboxyl modified product of the aforementioned hydrolyzed product obtained by reacting said hydrolyzed product with an unsaturated carboxylic acid or cyclic acid anhydride, with 10 to 100 parts by weight of an organic solvent capable of dissolving said hydrolyzed product or its carboxyl modified product, the solvent being not freely miscible with water and having a boiling point of not lower than 80.degree. C., 300 to 1000 parts by weight of water and 0.1 to 10 parts by weight of an alkylphenol ethylene oxide adduct having an HLB value of 10 to 20, emulsifying said mixture while it is maintained at a temperature of not lower than the softening point of said hydrolyzed product or carboxyl modified product, and decreasing the temperature of the system under stirring down to not higher than said softening point. The resultant powder is virtually spherical in its particle form, the particles are of almost equal size, and their particle size distribution is such that not less than 70% fall between 70 and 300.mu.. Such spherical powder, when used in electrostatic coating, can provide beautiful coating films.

Production of sphere-formed powdery copolymers

A powdered composition comprising (1) an organic polyisocyanate blocked with ethyleneimine and (2) a partially hydrolyzed product of an ethylene-vinyl ester copolymer and/or a carboxyl-modified-product of said partially hydrolyzed product exhibits exceedingly good levelling and post-curing characteristics and is advantageously flame-sprayed to give a coating film having good weatherability, heat resistance and chemical resistance.

Growing community of inventors

Sennan, Japan

Masamitsu Nakabayashi