US 4,303,581 AGranted

Water dispersed primer-surfacer composition

AssigneePPG Industries, Inc.

InventorsMorris Levine, Michael Yurcheshen, Roland W. Hight

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Abstract

Water based primer-surfacer compositions for application in the automotive industry over bare or treated metal and under a top coat of acrylic lacquer or enamel are formulated in aqueous medium using a latex of an addition copolymer prepared by emulsion polymerization of a mixture of styrenic and acrylic monomers, with hydroxyl and carboxyl functionality, preferably a mixture of styrene, ethyl acrylate, 2-hydroxy-ethyl methacrylate and acrylic acid. The latex is the predominant film forming ingredient in the composition and is combined with minor amounts of other film forming ingredients including a water soluble epoxy ester, preferably derived from bisphenol A, diglycidyl ether, drying oil fatty acids and maleic anhydride and water soluble or dispersible aminoplast resins, preferably methoxylated melamine formaldehyde resin and butoxylated urea formaldehyde resin. Pigments are also normally present in the composition.

Claims14

Dependent claims

A water-based composition, adapted for use as a primer-surfacer for application to a metallic substrate prior to application of an acrylic lacquer or enamel, characterized in that the film forming or binder ingredients dissolved or dispersed in aqueous solvent include a combination of three distinct types of separately prepared resinous film forming components as follows:

(A) an addition copolymer prepared by the polymerization in aqueous emulsion of a monomer mixture of (1) at least 40 percent by weight of a styrenic monomer (2) from 2 to 8 percent by weight of a hydroxyl functional monomer having a ##STR6## addition polymerizable group (3) from 1 to 6 percent by weight of a carboxyl functional monomer having a ##STR7## addition polymerizable group and (4) any remainder of other acrylic monomers having a ##STR8## polymerizable group, said addition copolymer being present as prepared in aqueous latex form, and the proportion of said addition copolymer being from 50 to 90 weight percent of the total film forming ingredients;
(B) water compatible epoxy ester resin in a proportion of 5 to 40 weight percent of the total film-forming ingredients and
(C) water soluble or dispersible aminoplast resin in a proportion of 5 to 20 weight percent of the total film forming ingredients.

Dependencies are inferred from the claim text.