Flexibilized polyurethane pipe coating
AssigneeAshland Oil, Inc.
InventorsGary A. Tolhurst, Albert L. Haugse
Life of this patent
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Abstract
Disclosed is a coating composition suitable for coating metal pipe, especially the interior of pipe. The coating composition comprises a blend of one or more polyether polyols and a flexibilizing stearically hindered amine-initiated polyether polyol and a multi-isocyanate curing agent. The curing composition optionally may contain an organic solvent and inert particulate filler. The coating composition cures within about 1 to 3 minutes after application and preferably is spray applied. The coating composition possesses adequate flexibility to pass a 15% ring deflection test.
Claims5
A method for coating a metal pipe with a flexible coating composition which comprises:
- applying to said metal pipe a coating composition which comprises (a) a blend of between about 76 and 92 weight percent of one or more polyether polyols and between about 24 and 8 weight percent of a flexibilizing sterically-hindered amine-initiated polyether polyol and (b) a multi-isocyanate curing agent, said coating composition curing within about 1 to 3 minutes after its application and the cured film of said coating composition passing a 15 percent ring deflection test on said metal pipe.
Dependencies are inferred from the claim text.