Abstract: The anti-fouling compositions and process described herein are capable of preventing or delaying for prolonged periods the fouling of structures such as boats, ships, piers, etc., having substantial portions thereof submerged in water. These compositions comprise a number of components, some of which may be coreacted, including: (a) an organic polymeric material having carboxylic acid groups therein which have been reacted with a trihydrocarbyl tin compound to produce ester derivative groups therein; (b) a hydrophilic component having poor water solubility, preferably being water insoluble, polyvinyl acetate and copolymers of vinyl chloride and vinyl acetate; (c) a hydrophobic component comprising a compound having 1-3 urethane groups therein and no more than about 20 carbon atoms preferably made by the reaction of an isocyanate compound, such as diisocyanate, with one or more hydroxy-containing solvents, such as ethanol, propanol, ethylene glycol monoethyl ether, etc.

Abstract: The anti-fouling compositions and process described herein are capable of preventing or delaying for prolonged periods the fouling of structures such as boats, ships, piers, etc., having substantial portions thereof submerged in water. Processes are described herein for preparing and applying these compositions as coatings to objects to be submerged in sea water. These compositions comprise a number of components, some of which may be reacted, including: (a) an organotin polymer or copolymer of the monomer having the formula R.sub.3 SnOOCR', wherein R and R' are defined hereinafter; (b) a hydrophilic component having poor water solubility, preferably being water insoluble and having at least two hydroxy groups per molecule, such as caster oil, partially hydrolyzed polyvinyl acetate, partially hydrolyzed copolymers of vinyl chloride and vinyl acetate, polymers of monovinyl ether of alkylene glycols such as ethylene glycol, etc.