Claims
- 1. In a method of coating a ferrous metal substrate, the steps of applying to said substrate a fluidized powdered polymeric material consisting essentially of polymeric material having units derived from:
- 1. about 1 to about 30% by weight of a (C.sub.2 -C.sub.8)-hydroxyalkyl ester of acrylic acid or methacrylic acid or a mixture of said hydroxyalkyl esters;
- 2. about 1 to about 30% by weight of a monoethylenically .alpha.,.beta.-unsaturated carboxylic acid or a mixture of said carboxylic acids; and
- 3. about 55 to about 98% by weight of a (C.sub.1 -C.sub.18) alkyl ester of acrylic acid or methacrylic acid, or a mixture of said alkyl esters, or an admixture containing said mixture and up to about 60% by weight of the admixture of an additional copolymerizable .alpha.,.beta.-ethylenically unsaturated monomer or monomers, wherein about 7 to about 95% of the carboxylic acid groups of the polymeric material have been neutralized to carboxylate groups, the carboxylate groups thus being partially neutralized, and having been derived from a liquid composition having an alkaline pH, said salt groups being selected from sodium, potassium, and barium, and heating and curing said coating.
- 2. The method of claim 1 wherein the hydroxyalkyl ester is 2-hydroxyethyl methacrylate.
- 3. The method of claim 2 wherein the carboxylic acid is acrylic acid or methacrylic acid.
- 4. The method of claim 3 wherein the hydroxyalkyl ester is 2-hydroxyethyl methacrylate and the alkyl ester is a mixture of a (C.sub.1 -C.sub.4) alkyl acrylate and methyl methacrylate.
- 5. The method of claim 4 wherein the (C.sub.1 -C.sub.4) alkyl acrylate is ethyl acrylate.
- 6. The method of claim 4 wherein the (C.sub.1 -C.sub.4) alkyl acrylate is butyl acrylate, and in which said carboxylate groups are sodium or potassium salts.
- 7. The method of claim 1 in which the composition comprises a pigment, containing titanium dioxide.
- 8. The method of claim 1 in which the polymeric material is a polymer of:
- 1. about 1 to about 30% by weight of a (C.sub.2 -C.sub.8)-hydroxyalkyl ester of acrylic acid or a mixture of said hydroxyalkyl esters;
- 2. about 1 to about 30% by weight of a monoethylenically .alpha.,.beta.-unsaturated carboxylic acid or a mixture of said carboxylic acids; and
- 3. about 55 to about 98% by weight of a (C.sub.1 -C.sub.18) alkyl ester of acrylic acid or methacrylic acid or a mixture of said alkyl esters, wherein about 30 to about 70% of the carboxylic acid groups of the polymer have been neutralized to carboxylate groups, the carboxylate groups thus being partially neutralized, and having been derived from a liquid composition having an alkaline pH, said salt groups being selected from sodium, potassium, and barium.
Parent Case Info
This is a division of application Ser. No. 360,856 filed May 16, 1973, now abandoned.
US Referenced Citations (10)
Divisions (1)
|
Number |
Date |
Country |
Parent |
360856 |
May 1973 |
|