Coating composition of an acrylic polymer, a dispersed acrylic polymer and an alkylated melamine crosslinking agent
AssigneeE. I. Du Pont de Nemours and Company
InventorsJoseph A. Antonelli, Isidor Hazan
Life of this patent
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Abstract
A coating composition that is used primarily as a clear finish over a colored or pigmented finish that are applied to automobile and truck bodies; the composition contains as the film forming binder (a) an acrylic polymer (b) a self stabilized dispersed resin formed by polymerizing in solution the following constituents: (1) an acrylic solution polymer, (2) monomers of alkyl methacrylate or acrylate and hydroxy ethyl acrylate or methacrylate, wherein either the acrylic solution polymer contains post reacted glycidyl methacrylate or acrylate or the monomers contain glycidyl methacrylate or acrylate, and (c) an alkylated melamine formaldehyde crosslinking agent.
Claims17
A coating composition comprising about 20-85% by weight of film forming binder and 15-80% by weight of an organic liquid carrier:
- (a) an acrylic polymer I consisting essentially of polymerized monomers of alkyl methacrylate, alkyl acrylate and hydroxy alkyl acrylate or methacrylate and having a weight average molecular weight of about 3,000 to 20,000;
- (b) a self stabilized dispersed resin formed by polymerizing in solution the following constituents:
- (1) an acrylic polymer II consisting essentially of polymerized monomers comprising alkyl methacrylate, alkyl acrylate, hydroxy alkyl acrylate or methacrylate, an ethylenically unsaturated carboxylic acid and having a weight average molecular weight of 3,000 to 20,000;
- (2) monomers comprising alkyl methacrylate, alkyl acrylate and hydroxy alkyl acrylate or methacrylate;
- wherein either acrylic polymer II contains glycidyl methacrylate or acrylate monomers post reacted with the carboxylic acid or the monomers contain glycidyl methacrylate or acrylate;
- (c) an alkylated melamine formaldehyde crosslinking agent;
- wherein the molecular weight of each of the polymers is determined by gel permeation chromatography using polymethyl methacrylate as the standard.
Dependencies are inferred from the claim text.