Low temperature glazing method
AssigneeS. C. Johnson & Son, Inc.
InventorDouglas W. Dill
Life of this patent
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Abstract
A low temperature glazing composition consisting essentially of a mixture of 25-75% by weight of an aqueous dispersion of an acrylic resin having a monomer composition of 40-85% by weight methyl methacrylate, 45-15% by weight butyl acrylate and 0-15% by weight methacrylic acid, this dispersion having 15-25% non-volatiles and a pH of 8.5-10.5; and 75-25% by weight of a powdered resin composition having a particle size within the range of 100-400 mesh consisting essentially of 100-80% by weight of a resin having a monomer composition of 60-85% by weight methyl methacrylate and 40-15% by weight butyl acrylate having a molecular weight of 10,000-20,000 and a Tg greater than 45.degree. C and 0-20% by weight of a pigment.
Claims10
A method for coating ceramic articles comprising:
- a. Priming the surface of said article with a coating of an aqueous dispersion of a first acrylic resin having a monomer composition of 40-85% by weight methyl methacrylate, 45-15% by weight butyl acrylate and 0-15% by weight of methacrylic acid, said dispersion having 15-25% non-volatiles and a pH of 8.5-10.5;
- b. Coating said primed surface with at least 1 coating of a mixture of 25-75% by weight of an aqueous dispersion of a second acrylic resin having a monomer composition of 40-85% by weight methyl methacrylate, 45-15% by weight butyl acrylate and 0-15% by weight of methacrylic acid, said dispersion having 15-25% non-volatiles and a pH of 8.5-10.5, and 75-25% by weight of a powdered resin composition having a particle size of about 100 to about 400 mesh consisting essentially of 96-80% by weight of a third acrylic resin having a monomer composition of 60-85% methyl methacrylate and 40-15% by weight butyl acrylate having a weight average molecular weight of 10,000-20,000 and a Tg of greater than 45.degree. C. and 4-20% by weight of a pigment;
- and
- c. Baking said coated article for 30 minutes to 4 hours at a temperature of 275.degree.-450.degree. F.
Dependencies are inferred from the claim text.