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Method of coating metal substrates
| Details |
Inventors: Miller, John J.; Baus, Richard E.; Lewis, Sheldon N.;
Assignee: Rohm and Haas Company (Philadelphia, PA)
Primary Examiner: Smith; Ronald H.
Assistant Examiner: Beck; Shrive P.
Attorney, Agent or Firm:
Polymeric materials are disclosed which comprise a hydroxyalkyl ester of acrylic acid or methacrylic acid, a monoethylenically .alpha.,.beta.-unsaturated carboxylic acid, and an alkyl ester or esters of acrylic and/or methacrylic acid are partially neutralized, isolated, and powdered to give useful powder coating compositions. The compositions are particularly adapted to provide coatings on metals, a method for accomplishing this being disclosed. |
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DETAILED DESCRIPTION We claim: 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
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