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Barrier coatings using polyacids. (Fresh Paint).

* Patent No. U.S. 6,447,845 B1

The Dow Corning Corporation has been awarded a patent for the preparation of a barrier coating. It is comprised of applying an organic acid to a substrate to form a layer and drying the layer, wherein the organic acid has at least two acid groups and is selected from the group consisting of a graft polymer, a polybasic carboxylic acid, a polymer of an unsaturated carboxylic acid and a co-polymer of an unsaturated carboxylic acid. The organic acid is mixed with one or more components selected from the group consisting of a compound of the formula [R.sub.a][X.sub.3-a] Si[(C[H.sub.2]).sub.n]Y, wherein each R is selected from the group consisting of a hydrogen atom and a hydrocarbon group with one to 10 carbon atoms; each X selected from the group consisting of an alkoxy group with one to four carbon atoms, a halogen atom, an oxime group, and a axyloxy group; Y is selected from the group consisting of an epoxy group, a methacryloxy group, an acryloxy group,--N[H.sub.2], and NH--[(C[H.sub.2]).sub.b]N[H.sub.2]; a is from zero to three; n is an integer from one to 12; and b is an integer from one to six; a condensation catalyst; a solvent selected from the group consisting of an alcohol, an ether, an ester, a hydrocarbon and water; and a filler selected from the group consisting of silicone resins, silica, magnesium oxide, clay, diatomaceous earth, calcium carbonate, finely ground quartz and layered silicates.
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Publication:Coatings World
Article Type:Brief Article
Geographic Code:1USA
Date:Jan 1, 2003
Words:270
Previous Article:Water-based adhesion promoter for polypropylene materials. (Patent Update).
Next Article:Core/shell polymeric particles. (Fresh Paint).
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