Marine antifouling coating composition
AssigneeThe British Petroleum Company p.l.c.
InventorJeffrey R. Kelsey
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Abstract
Compositions suitable for forming marine anti-fouling surface coatings comprise a polymer (e.g. maleinized polybutadiene) capable of cross-linking with amines, a hydrocarbyl polyisocyanate and a hydrocarbyl tin oxide or sulphide. The composition is preferably in two packs, which are combined on the surface to be coated, one pack containing the polymer and tin oxide or sulphide, and the other the polyisocyanate. A (thio) carbamate is formed as an intermediate which then hydrolyzes to an amine. A method of coating surfaces and surface coatings so produced are also claimed.
Claims8
A marine anti-fouling surface coating composition comprising components
- (1) from 5 to 55% wt of a polymer having 1 to 50% by weight of functional groups selected from the group consisting of carboxylic acid, anhydride and acid chloride groups capable of reacting with amine groups to form a three dimensional polymer network,
- (2) from 2 to 10% wt of a hydrocarbyl polyisocyanate which is not, in itself, a cross-linking agent for the polymer of (1) above, wherein the hydrocarbyl group has from one to ten carbon atoms,
- (3) from 5 to 35% wt of a hydrocarbyl tin compound having the formula R.sub.3 SnX wherein R is the hydrocarbyl group having from one to ten carbon atoms and X is oxygen or sulfur,
- (4) from 0 to 20% wt of an epoxy compound, and
- (5) from 0 to 80% wt of a pigment, wherein components (1), (2) and (3) interact in use according to the following sequence of reactions
- (a) the hydrocarbyl polyisocyanate and the hydrocarbyl tin compound react to form a carbamate or thiocarbamate,
- (b) the carbamate or thiocarbamate hydrolyses to an amine and the original hydrocarbyl tin compound, and
- (c) the amine and the polymer having functional groups react to give a surface coating.
Dependencies are inferred from the claim text.