Back to results
US 5,300,336 AGranted
High performance composite coating
AssigneeShaw Industries Ltd.
InventorsDennis Wong, Jiri Holub, Joseph G. Mordarski
Life of this patent
Estimating the term…
Abstract
The invention provides a composite protective coating applied to a steel pipe, the coating comprising an epoxy resin primer bonded to the outer surface of the pipe, a polyolefin outer sheath, and an interlayer consisting of a mixture of epoxy resin and polyolefin. The composition of the mixture forming the interlayer is graded throughout its thickness, being substantially all epoxy resin adjacent to the primer coating and substantially all polyolefin adjacent to the sheath.
Claims1
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.
1 more element
Dependencies are inferred from the claim text.