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Organotin Antifouling Coating with Epoxy and Polyacrylate Compositions.

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Patent, Filed 26 Jun 81, patented 17 Aug 82,

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The antifouling coating system of the present invention overcomes drawbacks experienced with the prior art by providing a durable antifouling coating which is simple to manufacture, easy to apply to ship surfaces, and which exhibits a controlled long-term leaching of antifoulant. This is accomplished by initially reacting a copolymer of styrene and maleic anhydride with tri-n-butyltin oxide to form an esterification product. Preferably, one mole of styrene-maleic anhydride is reacted with from 0.4 to 0.8 mole of tributyltin oxide to esterify from about 40 to about 80 of the maleic anhydride groups, with the unreacted maleic anhydride groups being utilized to crosslink with compatible epoxy resin types, such diglycidyl ether of bisphenol A, blended with selected polyacrylates. When blended with other compatible coating materials such as selected resins, binders, pigments and filters the crosslinked organotin polymer and epoxy based coating system can be formulated to optimize coating longevity, provide coating strength and durability, and permit easy application. Accordingly an object of the present invention is to provide an inexpensive method for producing an efficient, long-lasting organometallic antifoulant. Another object of this invention is the provision of an antifouling composition for preventing biological growths on submerged surfaces for an extended period of time. A further object of the present invention is to provide an antifouling composition which is durable, nonpolluting, and effective in preventing fouling. Yet another object of this invention is to provide an antifoulant formulation characterized by a controlled, low leaching rate of the antifouling agent from the coating matrix.

Subject Categories:

  • Coatings, Colorants and Finishes

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