초록 ▼

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 cry

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.

대표청구항 ▼

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 cry

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°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°C. or less.