Toray Industries, Inc.

Shota Suzuki

Sadayuki Kobayashi

Shinichiro Ochiai

A hollow molded article having a joining site where two or more split objects are welded by plastic welding and comes into contact with pressurized hydrogen, wherein an average spherulite size in a portion which is 500 &#x3bc;m deep inside from a surface of the hollow molded article is 20 &#x3bc;m or less, and a tensile strength of a test piece containing the joining site of the hollow molded article is 80% or more based on a tensile strength of a test piece not containing the joining site of the hollow molded article.

Hollow molded article and method of producing the same

A polyamide resin composition for an extrusion-molded article exposed to high-pressure hydrogen gas contains: 70 to 99 parts by weight of a polyamide 6 resin (A); 1 to 30 parts by weight of an impact modifier (B); and 0.005 to 1 parts by weight of a metal halide (C) with respect to a total of 100 parts by weight of the polyamide 6 resin (A) and the impact modifier (B). The polyamide resin composition has a melt tension of 20 mN or more when measured at 260&#xb0; C. and a take-up speed at strand break of 30 m/min or more when measured at 260&#xb0; C.

Polyamide resin composition for extrusion molded products exposed to high-pressure hydrogen, and extrusion molded product

A polyamide resin composition for a blow-molded article exposed to high-pressure hydrogen gas contains: 70 to 99 parts by weight of a polyamide 6 resin (A); 1 to 30 parts by weight of an impact modifier (B); and 0.005 to 1 parts by weight of a metal halide (C) with respect to a total of 100 parts by weight of the polyamide 6 resin (A) and the impact modifier (B). The polyamide resin composition has a melt tension of 20 mN or more when measured at 260&#xb0; C. and a take-up speed at strand break of 50 m/min or more when measured at 260&#xb0; C.

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Nagoya, Japan

Shota Suzuki