US 4,596,724 A · Anti-fouling coating composition, process for applying same and coating thereby obtained

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., or a monoisocyanate with a di- or tri-hydroxy compound such as ethylene glycol, propylene glycol, glycerine, etc., preferably in the presence of low molecular weight ketones, esters and aromatic hydrocarbons, such as methyl ethyl ketone, cyclohexanone, toluene, etc. This composition is very effective as an anti-fouling paint for application as a coating to objects to be submerged in sea water.

Claims37

Dependent claims

An anti-fouling, film-forming composition comprising:

(a) a hydrophilic component selected from the group consisting of a polyvinyl ester in which the acid group of the ester is selected from the group consisting of acetic, propionic and butyric acid groups, said polyvinyl ester having an average molecular weight in the range of 8,000 to 35,000, and a copolymer of vinyl chloride and said vinyl ester having at least 25 molar percent of said vinyl ester and a molecular weight in the range of 8,000 to 35,000;
(b) a hydrophobic component having no more than 35 carbon atoms therein and having 1-3 urethane groups per molecule;
(c) a solvent component having one or more compounds selected from the group consisting of a hydroxyl-containing compound having the formula R"(OH).sub.n' wherein R" represents an aliphatic, arylaliphatic or cycloaliphatic hydrocarbon group having 2-10 carbon atoms and n' is an integer having a value of 1-3, R" may also have 1 carbon atom when n' is 1, a monoether or monoester of an alkylene glycol having no more than 10 carbon atoms, an aromatic hydrocarbon having a kauri butanol value of 73-105, and a ketone having no more than 10 carbon atoms;
and
(d) an organic tin polymer derived by the reaction of a COOH-containing polymer with R.sub.3 SnOH or (R.sub.3 Sn).sub.2 O wherein R is a lower alkyl, cycloalkyl or aryl radical.

2 more elements

An anti-fouling coating deposited on a surface of an object to be submerged in sea water comprising 50-75 percent by weight based on said coating of an organic tin polymer derived by the reaction of a carboxylic acid-containing polymer with R.sub.3 SnOH or (R.sub.3 Sn).sub.2 O wherein R is a lower alkyl, cycloalkyl or aryl radical;

19-38 percent by weight of a hydrophilic component selected from the group consisting of a polyvinyl ester in which the acid group of the ester is selected from the group consisting of acetic, propionic and butyric acid groups, said polyvinyl ester having an average molecular weight in the range of 8,000 to 35,000, and a copolymer of vinyl chloride and said vinyl ester having at least 25 molar percent of said vinyl ester and a molecular weight in the range of 8,000 to 35,000;
and a hydrophobic component having no more than 35 carbon atoms therein and having 1-3 urethane groups per molecule.

The process of protecting a surface of an object from fouling by exposure to sea water comprising the steps of applying to said surface a film-forming composition comprising:

(a) 10-22 percent by weight of a hydrophilic component selected from the group consisting of a polyvinyl ester in which the acid group of the ester is selected from the group consisting of acetic, propionic and butyric acid groups, said polyvinyl ester having an average molecular weight in the range of 8,000 to 35,000, and a copolymer of vinyl chloride and said vinyl ester having at least 25 molar percent of said vinyl ester and a molecular weight in the range of 8,000 to 35,000;
(b) 2.5-7.5 percent by weight of a hydrophobic component having no more than 35 carbon atoms therein and having 1-3 urethane groups per molecule;
(c) 30-50 percent by weight of an organic tin polymer derived by the reaction of a COOH-containing polymer with R.sub.3 SnOH or (R.sub.3 Sn).sub.2 O wherein R is a lower alkyl, cycloalkyl or aryl radical;
and
(d) 20-40 percent by weight of a solvent component having one or more compounds selected from the group consisting of a hydroxyl-containing compound having the formula R"(OH).sub.n' wherein R" represents an aliphatic, arylaliphatic or cycloaliphatic hydrocarbon group having 2-10 carbon atoms, except that R" may also have one carbon atom when n' is 1, and n' is an integer having a value of 1-3, a monoether or monoester of an alkylene glycol having no more than 10 carbon atoms, an aromatic hydrocarbon having a kauri butanol value of 73-105, and a ketone having no more than 10 carbon atoms.
and allowing said coating to dry to a hard film before the resultant coated surface is exposed to sea water.

3 more elements

Dependencies are inferred from the claim text.

Anti-fouling coating composition, process for applying same and coating thereby obtained

Life of this patent

Anti-fouling coating composition, process for applying same and coating thereby obtained

Life of this patent

Abstract

Claims37