Acrylic polymer dispersant for aqueous acrylic coating compositions
AssigneeE. I. Du Pont de Nemours and Company
InventorHenry L. Jakubauskas
Life of this patent
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Abstract
An acrylic polymer dispersant useful for preparing pigment dispersions utilized in aqueous acrylic coating compositions; the acrylic polymer is of 1. styrene, an alkyl methacrylate such as methyl methacrylate, isodecyl methacrylate or stearyl methacrylate or a mixture of styrene and an alkyl methacrylate; 2. an alkyl acrylate having 2-12 carbon atoms in the alkyl group; and 3. acrylic acid or methacrylic acid; the acrylic polymer has a glass transition temperature of about -90.degree.C. to 70.degree.C. and a weight average molecular weight of about 500-30,000.
Claims10
An acrylic polymer dispersant for dispersing pigments in aqueous acrylic paints consisting essentially of about
- 1. 46-62% by weight, based on the weight of acrylic polymer, of constituents selected from the group consisting of styrene, an alkyl methacrylate or a mixture of styrene and an alkyl methacrylate;
- wherein the alkyl methacrylate is selected from the group consisting of methyl methacrylate, isodecyl methacrylate or stearyl methacrylate;
- 2. 28-34% by weight, based on the weight of the acrylic polymer, of an alkyl acrylate having 2-12 carbon atoms in the alkyl group;
- and
- 3. 10-20% by weight, based on the weight of the acrylic polymer, of acrylic acid or methacrylic acid;
- and
- wherein the acrylic polymer has a glass transition temperature of about -90.degree.C to 70.degree.C and a weight average molecular weight of about 500-30,000.
In an aqueous paint composition of an acrylic film-forming polymer and a water dispersible crosslinking agent, the improvement used therewith consists essentially of
- 1-50% by weight, based on the weight of the paint composition, of an acrylic polymer dispersant consisting essentially of about
- 1. 46-62% by weight, based on the weight of the acrylic polymer of methyl methacrylate;
- 2. 28-34% by weight, based on the weight of the acrylic polymer, of butyl acrylate;
- and
- 3. 10-20% by weight, based on the weight of the acrylic polymer of acrylic acid;
- wherein the paint composition contains sufficient ammonium hydroxide or amine to provide a pH of about 7-10.
Dependencies are inferred from the claim text.