Coatings for optical systems
AssigneeGoodyear Aerospace Corporation
InventorJohn Uram, Jr.
Life of this patent
Estimating the term…
Abstract
A coating for optical members such as acrylic or polycarbonate comprising prehydrozyled alkyl silicate, polysilicic acid and monocarboxylic acid dispersed in an aqueous vinyl interpolymer and an epoxy binder containing a filler of fumed silica or aluminum oxide and a silane.
Claims8
A hydrolytically stable, hard, transparent coating on an acrylic or polycarbonate optical member comprising an optical member having a coating of 1 to 10 microns thereon, said coating comprising a cured composition formed from a dispersion coating of a mixture by weight of 0 to about 30 parts of prehydrolyzed alkyl silicate, where said alkyl radical contains 1 to 10 carbon atoms, 0 to about 30 parts of polysilicic acid, 0 to about 50 parts of a monocarboxylic acid having 1 to 2 carbon atoms, 0 to about 50 parts of water, 1 to 5 parts of a silane, 0 to about 3 parts of a filler selected from the class consisting of fumed silica and alumina, in a binder system composed of epoxy resin and an acidified aminoethylated vinyl interpolymer having interpolymer pendant groups of carboxyloxy (polyalkylamine) wherein the number of alkylamine groups ranges from 1 to about 2.5 and the interpolymer has aminoethylation containing at least 3 percent by weight of pendant carboxylic groups, said aminoethyl groups being reacted with sufficient acid to impart water solubility to said interpolymer, said silane being selected from the class consisting of chloropropyltrimethoxysilane, vinyltrichlorosilane, vinyltriethoxysilane, vinyl-tris(2-methoxyethoxy)silane, gamma-methacryloxypropyl-tris-(2-methoxyethoxy)silane, beta-(3,4-epoxycyclohexyl)-ethyltrimethoxysilane, gamma-glycidoxypropyltrimethoxysilane, vinyltriacetoxysilane, gamma-mercaptopropyltrimethoxysilane, gamma-aminopropyltriethoxysilane, N-beta(aminoethyl)-gamma-aminopropyltrimethoxysilane, methyl[2-(gamma-trimethoxysilypropylamino)ethylamino]3-propionate in methanol, modified amino-organosilane, ureido-silane and mercaptoethyltriethoxysilane.
A hydrolytically stable, hard, transparent coating on an acrylic or polycarbonate optical member comprising an optical member having a coating of 1 to 10 microns thereon, said coating comprising a cured composition formed from a dispersion coating of a mixture by weight of 0.5 to about 30 parts of prehydrolyzed alkyl silicate, where said alkyl radical contains 1 to 10 carbon atoms, about 0.5 to about 30 parts of polysilicic acid, about 0.5 to about 50 parts of a monocarboxylic acid having 1 to 2 carbon atoms, about 0.5 to about 50 parts of water, 1 to 5 parts of a silane, about 0.5 to about 3 parts of a filler selected from the class consisting of fumed silica and alumina, in a binder system composed of epoxy resin and an acidified aminoethylated vinyl interpolymer having interpolymer pendant groups of carboxyloxy (polyalkylamine) wherein the number of alkylamine groups ranges from 1 to about 2.5 and the interpolymer has aminoethylation containing at least 3 percent by weight of pendant carboxylic groups, said aminoethyl groups being reacted with sufficient acid to impart water solubility to said interpolymer, said silane being selected from the class consisting of chloropropyltrimethoxysilane, vinyltrichlorosilane, vinyltriethoxysilane, vinyl-tris(2-methoxyethoxy)silane, gamma-methacryloxypropyl-tris-(2-methoxyethoxy)silane, beta-(3,4-epoxycyclohexyl)-ethyltrimethoxysilane, gamma-glycidoxypropyltrimethoxysilane, vinyltriacetoxysilane, gamma-mercaptopropyltrimethoxysilane, gamma-aminopropyltriethoxysilane, N-beta(aminoethyl)-gamma-aminopropyltrimethoxysilane, methyl [2-(gamma-trimethylsilypropylamino)ethylamino] 3-propionate in methanol, modified amino-organosilane, ureidosilane and mercaptoethyltriethoxysilane.
Dependencies are inferred from the claim text.