Hydrophilic polymer coating for underwater structures
AssigneeNational Patent Development Corporation
InventorsThomas H. Shepherd, Francis E. Gould
Life of this patent
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Abstract
Hydrophilic polymers, i.e., hydrophilic cellulose esters, hydrophilic cellulose ethers, hydrophilic polyurethanes, hydrophilic vinyl lower alkyl ether polymers, vinyl alcohol group containing polymers, partially hydrolized polyacrylonitrite, ethylene-maleic anhydride copolymer, stryene-maleic anhydride copolymer, proteins, high molecular weight polyalkylene oxides or phenoxy resins, having encapsulated therein either or both anti-fouling agents or pigments is applied as a coating to underwater portions of a marine structure so as to reduce the drag of said structure.
Claims62
A marine structure which is a watercraft having an adherent continuous exposed coating consisting essentially of a member of the group consisting of (1) a water insoluble hydrophilic polymer which is swellable to an extent of at least 10% in water, said hydrophilic polymer being selected from the group consisting of hydrophilic cellulose esters, hydrophilic cellulose ethers, hydrophilic polyurethanes, hydrophilic vinyl lower alkyl ether polymers, vinyl alcohol group containing polymers, partially hydrolyzed polyacrylonitrile, ethylene-maleic anhydride copolymer, styrene-maleic anhydride copolymer, proteins, high molecular weight polyalkylene oxides and phenoxy resins and wherein the coating is sufficient to reduce the drag of the watercraft when in water and, (2) said hydrophilic polymer having encapsulated therein at least one member of the group consisting of anti-fouling agents and pigments.
Dependencies are inferred from the claim text.