POLYOLEFIN-COVERED STEEL PIPE POSSESSING EXCELLENT RESISTANCES TO THERMALLY OXIDATIVE DETERIORATION AND WEATHERING AND PROCESS FOR MANUFACTURING THE SAME

Title:

POLYOLEFIN-COVERED STEEL PIPE POSSESSING EXCELLENT RESISTANCES TO THERMALLY OXIDATIVE DETERIORATION AND WEATHERING AND PROCESS FOR MANUFACTURING THE SAME

Document Type and Number:

WIPO Patent Application WO/1998/018619

Kind Code:

A1

Abstract:

A polyolefin-covered steel pipe comprising a steel pipe and an epoxy primer layer, a maleic anhydride-modified polyolefin layer, and a polyolefin layer laminated in that order on the circumferential surface of the steel pipe, wherein the maleic anhydride-modifed polyolefin layer contains at least three predetermined antioxidants, the polyolefin layer contains the above antioxidants in combination with predetermined photostabilizer and inorganic pigment. The steel pipe combines high resistance to thermally oxidative deterioration with high weathering resistance. It is preferable to prepare both the maleic anhydride-modified polyolefin layer and the polyolefin layer from an ethylene/propylene block copolymer.

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Inventors:

TSURI SHIRO (JP)
TAKAO KENJI (JP)
MOCHIZUKI KAZUO (JP)

Application Number:

PCT/JP1997/003895

Publication Date:

May 07, 1998

Filing Date:

October 27, 1997

Export Citation:

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Assignee:

KAWASAKI STEEL CO (JP)
TSURI SHIRO (JP)
TAKAO KENJI (JP)
MOCHIZUKI KAZUO (JP)

International Classes:

B32B15/08; B32B1/08; B32B15/085; B32B27/32; F16L9/147; F16L57/06; (IPC1-7): B32B15/08

Foreign References:

JPH0592514A	1993-04-16
JPH08159368A	1996-06-21

Other References: