Claims
- 1. A steel pipe having a composite protective coating consisting of:
- an epoxy resin primer coating of even thickness between 100.mu. and about 400.mu. heat bonded to the outer surface of the pipe;
- a polyolefin outer sheath of between 200.mu. and 1000.mu. in thickness encasing the primer coated surface of the pipe; and
- an interlayer of even thickness between 100.mu. and 400.mu. bonding the polyolefin sheath to the primer coating, said interlayer comprising a mixture of epoxy resin and polyolefin, the composition of said interlayer being graded through the thickness of the interlayer from all epoxy resin adjacent to the primer coating to all polyolefin adjacent to the sheath.
CROSS-REFERENCE TO RELATED APPLICATION
This application is a divisional of our copending application Ser. No. 07/741,598, filed on Aug. 7, 1991 now U.S. Pat. No. 5,178,902 for HIGH PERFORMANCE COMPOSITE COATING, which is a continuation-in-part of our application Ser. No. 07/631,454 filed Dec. 21, 1990 for HIGH PERFORMANCE COMPOSITE COATING and now abandoned.
US Referenced Citations (9)
Divisions (1)
|
Number |
Date |
Country |
Parent |
741598 |
Aug 1991 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
631454 |
Dec 1990 |
|