Patent ID: 7892600

Claim:
Process for rotolining the steel interior surface of a hollow article, comprising, adding a composition consisting essentially of particles of fluorine treatment stabilized tetrafluoroethylene-perfluoro(alkyl vinyl ether) copolymer and adhesion-promoting, non-bubble promoting metal powder to the interior of said hollow article, said metal powder constituting no greater than about 2 wt % of said composition, rotating said article to distribute the composition over said interior surface, heating said article while it is rotating to melt said copolymer particles to form a continuous bubble-free lining comprising said copolymer and said metal powder on said interior surface, and cooling said article, and obtaining as a result thereof said bubble-free lining adhering to said steel interior surface, said adhering being characterized by a peel strength of at least about 25 lb/in, said copolymer being bubble-free when subjected to said rotolining by itself, said composition being formed after the preparation of said fluorine treatment stabilized tetrafluoroethylene-perfluoro(alkyl vinyl ether) copolymer.