Polypropylene coated steel pipe
AssigneeNippon Steel Corporation
InventorsKazuyuki Suzuki, Masami Ishida, Fuyuhiko Ohtsuki, Yoshihiro Inuizawa, Saburo Hinenoya, Mansei Tanaka, Yoshio Shindou
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Abstract
A polypropylene coated steel pipe comprising a steel pipe, an adhesive layer coated on the external surface of the steel pipe, which has been subjected to a pretreatment, and a polypropylene layer coated on the adhesive layer. The outermost polypropylene layer comprises, as a main constituent, a crystalline ethylene-propylene block copolymer and the adhesive layer comprises a modified polyolefin adhesive.
Claims15
A polypropylene coated steel pipe comprising a steel pipe, an adhesive layer coated on the external surface of the steel pipe which has been subjected to a pretreatment, and a polypropylene layer coated on the adhesive layer, the outermost polypropylene layer comprising, as a main constituent, a crystalline ethylene-propylene block copolymer having a brittleness temperature of 15.degree. C. or less and the adhesive layer comprising a mixture of an unsaturated carboxylic acid modified crystalline polypropylene, an unmodified crystalline polypropylene and a polyolefin rubber having a brittleness temperature of -20.degree. C. or less.
Dependencies are inferred from the claim text.