Japan Polyolefins Co., Ltd.

Japan Polyethylene Corporation

Fumio Asada

Tatsuo Yamaguchi

Kenichi Hiraki

Kei Takahashi

Masaaki Ikeda

Haruo Ikeda

Kazuyuki Sakamoto

Osamu Miyachi

Yoshimi Shimizu

Naoki Minorikawa

Reiji Higuchi

Toshiaki Egashira

Kimiya Miyoshi

Shinji Miwa

Sinji Miwa

Masahiro Wakayama

A welding material, comprising a modified polyethylene resin composition (Z) comprising from 0.5 to 95 wt % of a modified polyethylene resin (X) having at least one monomer selected from the group consisting of an unsaturated carboxylic acid and its derivative, grafted to a polyethylene resin (A) having a density of from 0.910 to 0.965 g/cmand a MFR (temperature: 190&#xb0; C., load: 2.16 kg) of from 0.1 to 5.0 g/10 min, and from 5 to 99.5 wt % of an unmodified polyethylene resin (Y) having a density of from 0.930 to 0.965 g/cm, a MFR of from 0.01 to 5.0 g/10 min and a melt flow rate ratio (HL-MFR (temperature: 190&#xb0; C., load: 21.6 kg)/MFR of from 40 to 270, and having a density of from 0.938 to 0.965 g/cmand a MFR of from 0.05 to 1.0 g/10 min.

Welding material and fuel tank thereby welded

An object of the present invention is to provide an adhesive resin composition which displays excellent adhesive strength on bonding to a barrier material, during initial adhesion, durable adhesion, and even after soak in fuel oil, and which also has excellent moldability. Furthermore, another object of the present is to provide an adhesive resin composition which when recycled, displays good compatible in a regrind layer with polyethylene resins and barrier materials such as saponified products of ethylene-vinyl acetate copolymers or polyamide based resins, and which is consequently capable of suppressing deterioration in the low temperature impact resistance of a multi-layer vessel containing a regrind layer. In order to achieve these objects, the present invention provides an adhesive resin composition (C) comprising (A) 100 to 5% by mass of a modified polyethylene in which an unsaturated carboxylic acid and/or an unsaturated carboxylic acid derivative unit is grafted to a high molecular weight polyethylene with a melt flow rate (MFR: temperature 190&#xb0; C., loading 2.16 kg) of 0.1 to 2.0 g/10 minutes, and a density of 0.91 to 0.96 g/cm, and (B) 0 to 95% by mass of an unmodified polyethylene with a melt flow rate (MFR: temperature 190&#xb0; C., loading 2.16 kg) of 0.1 to 20 g/10 minutes, and a density of 0.86 to 0.96 g/cm, wherein the density of the adhesive resin composition (C) is 0.925 to 0.940 g/cm, the content of the unsaturated carboxylic acid and/or unsaturated carboxylic acid derivative unit incorporated therein is at least 0.09% by mass, and the melt flow rate (MFR: temperature 190&#xb0; C., loading 2.16 kg) is from 0.1 to 2 g/10 minutes.

Adhesive resin composition and multi-layer laminated structure using the same

The present invention relates to an ethylene-&agr;-olefin copolymer; a composition thereof; a film thereof; a polar group-containing resin material; and productions and use of the ethylene-&agr;-olefin copolymer. The ethylene-&agr;-olefin copolymer of the present invention is characterized in satisfying the following conditions (A) to (E): (A) a density in the range of 0.92 to 0.96 g/cm ; (B) a melt flow rate (MFR) in the range of 0.01 to 200 g/10 min; (C) a molecular weight distribution (Mw/Mn) in the range of 1.5 to 5.0; (D) possessing only one peak in terms of the number of peaks observed in an elution temperature-eluted amount curve as measured by the continuous temperature raising elution fractionation (TREF) method, from the integrated elution curve obtained by the elution temperature-eluted amount curve, the difference T &minus;T in the temperature and density d respectively satisfy a specific relationship, wherein T is the temperature where 25% of the total elution is obtained, and T is the temperature where 75% of the total elution is obtained; and (E) possessing one or two melting point peaks, and among these the highest melting point T and the density d satisfy a specific relationship. Accordingly, this ethylene-&agr;-olefin copolymer exhibits a superior thermal resistance, heat sealability, and processability.

Ethylene/&agr;-olefin copolymer

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Kawasaki, Japan

Fumio Asada