Protecting elongated substrate with multiple-layer polymer covering
AssigneeRaychem Corporation
InventorsGeorge Pieslak, Tony G. Alvernaz, Robin John, James A. Rinde, Eric Van Zele
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Abstract
The invention relates to a method for applying a protective coating to a substrate, such as metallic pipe, which comprises applying onto the substrate a liquid curable polymeric composition capable of curing to a substantial extent within about 24 hours at less than about 80.degree. C., then applying one or more polymeric layers, the innermost of which is capable of interacting with said curable composition, and permitting the composition to cure. In certain embodiments the polymeric layer is applied as a polymeric article, in other embodiments a multiple layer polymeric covering is applied over the curable composition.
Claims11
A method of applying a protective covering to an elongated substrate which comprises:
- (a) applying to the substrate at a temperature of not more than about 80.degree. C., a curable polymeric composition which is a liquid at about 20.degree. C., is curable to a substantial extent within about 24 hours at a temperature of not more than about 80.degree. C., and comprises
- (i) a resin component;
- (ii) a curing agent;
- (b) applying a multiple-layer polymeric covering, having an innermost layer and an outermost layer, the innermost layer comprising uncured polymeric heat activatable sealant capable of interacting with said curable composition, over the curable polymeric composition in a manner such that said innermost layer is in intimate contact with said composition;
- and
- (c) allowing the curable composition to cure while maintaining intimate contact between said innermost layer and said composition at a temperature at which the outermost layer of the covering does not melt or flow.
Dependencies are inferred from the claim text.