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US 4,517,327 AGranted
Low temperature curable coating composition
AssigneeMonsanto Company
InventorsJohn F. Heaps, Dennis E. Erickson
Life of this patent
Estimating the term…
Abstract
A process for preparing an improved low temperature curable water dispersed coating compositions comprising (1) forming a solution of an alkoxymethylmelamine and a styrene-allyl alcohol copolymer in a polar solvent and (2) adding to the solution an aqueous solution or dispersion of a hydroxyl-containing resin.
Claims16
A process for preparing a coating composition which comprises:
- (1) forming a solution of a water-soluble aminoplast selected from the group consisting of methoxymethyl derivatives of urea, melamine and methyl- and ethyl-guanamines and a styrene-(meth)allyl alcohol polymer in a polar solvent wherein the ratio of the aminoplast to styrene-(meth)allyl alcohol copolymer is in the range of about 3:2 to about 50:1 by weight;
- and
- (2) adding the solution to an aqueous solution or dispersion of a hydroxyl-containing resin and mixing to obtain a uniform dispersion;
- wherein the styrene-(meth)allyl alcohol copolymer has a molecular weight in the range of about 1000 to about 2500 and a hydroxyl content in the range of about 4.0 to about 10.0 weight percent and wherein the hydroxyl containing resin is selected from the group consisting of acrylic, and polyester hydroxyl-containing resins containing about 1.3-10 weight % hydroxyl and an acid number in the range of about 2 to about 12.
1 more element
A process for preparing a coating composition which comprises:
- (1) forming a solution of a water-soluble aminoplast selected from the group consisting of methoxymethyl derivatives of urea, melamine and methyl- and ethyl-guanamines and as styrene-(meth)allyl alcohol copolymer in at least 3 parts per hundred of a polar solvent wherein the ratio of aminoplast to styrene-(meth)allyl alcohol copolymer is in the range of about 3:2 to about 50:1 by weight;
- (2) adding to the solution an aqueous dispersion of one or more hydroxyl-containing resins and mixing to obtain a uniform dispersion wherein the ratio of aminoplast to hydroxyl-containing resin is in the range of about 1:1 to about 1:10;
- and
- (3) adding a polar solvent to the dispersion or solution to achieve a solvent content of 10 weight % or greater of the total coating composition and a ratio of water to solvent of at least about 1:1,
- wherein the styrene-allyl alcohol copolymer has a molecular weight in the range of about 1000 to 2500 and a hydroxyl content in the range of about 4.0 to 10.0 weight percent and comprises from about 1 to about 7 weight percent of the total solids of the coating composition;
- wherein the total solids of the coating composition is from 30 to 70 weight percent;
- and wherein the hydroxyl-containing resin is selected from the group consisting of acrylic, and polyester hydroxyl-containing resins containing about 1.3-10 weight % hydroxyl and an acid number in the range of about 2 to about 12.
4 more elements
A process for preparing a coating composition which comprises:
- (1) forming a solution of styrene-allyl alcohol copolymer with a molecular weight in the range of about 1000 to 2500 and a hydroxyl content of about 4.0 to about 10.0 and hexamethoxymethylmelamine in at least 3 parts per hundred of a polar solvent wherein the ratio of hexamethoxymethylmelamine and styreneallyl alcohol copolymer is in the range of about 3:2 to 50:1;
- (2) adding to the solution an aqueous solution or dispersion of one or more hydroxyl-containing resins and mixing to obtain a uniform dispersion wherein the ratio of hexamethoxymethylmelamine to hydroxyl-containing resin is in the range of about 1:1 to about 1:10;
- and
- (3) adding a polar solvent to the dispersion or solution to achieve a solvent content of 10 weight percent or greater of the total coating composition and a ratio of water to solvent of at least about 1:1;
- wherein about 1 to about 7 weight percent of the total solids of the coating composition is the styrene-allyl alcohol copolymer;
- wherein the total solids of the coating composition is from 30 to 70 weight;
- and wherein the hydroxyl-containing resin is selected from the group consisting of acrylic, and polyester hydroxyl-containing resins containing about 1.3-10 weight % hydroxyl and an acid number in the range of about 2 to about 12.
4 more elements
Dependencies are inferred from the claim text.