Patent ID: 7338688

Claim:
A method for forming a protective layer on a metal structure having an interior surface comprising a pipe, conduit or tank comprising the steps of: i) providing a composition comprising a silylated isobutylene copolymer which is the product of contacting: a) an elastomeric copolymer selected from halogenated or non-halogenated copolymers of isobutylene with up to 15 wt % of at least one C 4 to C 14 conjugated diene and halogenated or non-halogenated copolymers of isobutylene with up to 20 wt % of at least one vinyl aromatic monomer; b) a silane of the general formula: wherein R is an alkenyl group having 2 to 10 carbon atoms, R′ is independently selected from hydrocarbon or halogenated hydrocarbon groups which contain no aliphatic unsaturation, X is a silicon-bonded hydrolyzable group selected from alkoxy, acyloxy, ketoxime, amino, amido, aminoxy or alkenyloxy group, and n is 2 or 3, and c) a free radical generating agent; ii) mixing the silylated copolymer with a condensation catalyst which promotes cross linking of the silylated copolymer in the presence of moisture; iii) applying the composition of step (ii) to the interior surface of the structure to form a coating layer; iv) contacting the layer from step (iii) with sufficient moisture to at least partially crosslink the composition.