Coating method

A method for improving the scrub resistance of a coating comprising

• forming an aqueous coating composition comprising an aqueous emulsion polymer, said polymer having a glass transition temperature (Tg) from −60° C. to 80° C., formed by the free radical polymerization of at least one ethylenically unsaturated nonionic acrylic monomer, 0.1-50%, by weight based on the total weight of said polymer, ethylenically unsaturated aldehyde reactive group-containing monomer, and 0-7.5%, by weight based on the total weight of said polymer, ethylenically unsaturated acid monomer in the presence of 0.01-1.0%, by weight based on the total weight of said polymer, t-alkyl hydroperoxide, t-alkyl peroxide, or t-alkyl perester wherein the t-alkyl group includes at least 5 Carbon atoms and, optionally, at least one other oxidant;
• applying said aqueous coating composition to a substrate;
• and
• drying, or allowing to dry, said aqueous composition.

A method for lowering the minimum film formation temperature of an aqueous coating composition comprising

• forming an aqueous coating composition comprising an aqueous emulsion polymer, said polymer having a glass transition temperature (Tg) from −60° C. to 80° C., formed by the free radical polymerization of at least one ethylenically unsaturated nonionic acrylic monomer, 0.1-50%, by weight based on the total weight of said polymer, ethylenically unsaturated aldehyde reactive group-containing monomer, and 0-7.5%, by weight based on the total weight of said polymer, ethylenically unsaturated acid monomer in the presence of 0.01-1.0%, by weight based on the total weight of said polymer, t-alkyl hydroperoxide, t-alkyl peroxide, or t-alkyl perester wherein the t-alkyl group includes at least 5 Carbon atoms and, optionally, at least one other oxidant;
• applying said aqueous coating composition to a substrate;
• and
• drying, or allowing to dry, said aqueous composition.

A method for improving the adhesion of a coating to a substrate comprising

• forming an aqueous coating composition comprising an aqueous emulsion polymer, said polymer having a glass transition temperature (Tg) from −60° C. to 80° C., formed by the free radical polymerization of at least one ethylenically unsaturated nonionic acrylic monomer, 0.1-50%, by weight based on the total weight of said polymer, ethylenically unsaturated aldehyde reactive group-containing monomer, and 0-7.5%, by weight based on the total weight of said polymer, ethylenically unsaturated acid monomer in the presence of 0.01-1.0%, by weight based on the total weight of said polymer, t-alkyl hydroperoxide, t-alkyl peroxide, or t-alkyl perester wherein the t-alkyl group includes at least 5 Carbon atoms and, optionally, at least one other oxidant;
• applying said aqueous coating composition to said substrate;
• and
• drying, or allowing to dry, said aqueous composition.

A method for improving the adhesion of a coating to an alkyd substrate comprising forming an aqueous coating composition comprising

• (1) a first aqueous emulsion polymer comprising 0-2%, by weight based on the total weight of said first polymer, ethylenically unsaturated aldehyde reactive group-containing monomer, said first polymer having a glass transition temperature from −60° C. to 80° C. and a particle diameter of 200 to 1000 nanometers, prepared in the presence of 0.001-6%, by weight based on the dry weight of said first emulsion polymer, of a colloidal stabilizer selected from the group consisting of hydroxyethyl cellulose, N-vinyl pyrrolidone, polyvinyl alcohol, partially acetylated polyvinyl alcohol, carboxymethyl cellulose, gum arabic, and mixtures thereof, said colloidal stabilizer, and
• (2) a second aqueous emulsion polymer, said second polymer having a glass transition temperature (Tg) from −60° C. to 80° C. and a particle diameter of 30 to 200 nanometers, formed by the free radical polymerization of at least one ethylenically unsaturated nonionic acrylic monomer, 0.1-12.5%, by weight based on the total weight of said second polymer, ethylenically unsaturated aldehyde reactive group-containing monomer, and 0-7.5%, by weight based on the total weight of said second polymer, ethylenically unsaturated acid monomer in the presence of 0.01-1.0%, by weight based on the total weight of said second polymer, t-alkyl hydroperoxide, t-alkyl peroxide, or t-alkyl perester wherein the t-alkyl group includes at least 5 Carbon atoms and, optionally, at least one other oxidant, wherein the dry weight ratio of said second polymer to said first polymer is from 1:99 to 1:1;
• applying said aqueous coating composition to said alkyd substrate;
• and
• drying, or allowing to dry, said aqueous composition.