Water-based paint compositions and multilayer coating film-forming method
AssigneeKansai Paint Co., Ltd.
InventorsYoshiyuki Yukawa, Noritoshi Nakane
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Abstract
This invention provides water-based paint compositions containing water-dispersible acrylic polymer particles, hydroxyl-containing resin and curing agent, the water-dispersible acrylic polymer particles having a weight-average molecular weight of at least 1,100,000 and an absorbance value not higher than 0.2 at a wavelength of 330 nm, as measured with spectrophotometer in the state of liquid dispersion at a mass concentration of 1.35% in 1,4-dioxane solvent; and the compositions excelling in finished appearance such as coated surface smoothness and coating film performance such as chipping resistance and water resistance.
Claims33
A water-based paint composition comprising:
- water-dispersible acrylic polymer particles (A), hydroxyl-containing resin (B) and curing agent (C), the water-dispersible acrylic polymer particles (A) having a weight-average molecular weight of at least 1,100,000 and an absorbance in a liquid dispersion at a mass concentration of 1.35% in 1,4-dioxane solvent of not higher than 0.2 at a wavelength of 330 nm as measured with a spectrophotometer,
- wherein the water-dispersable acrylic polymer particles (A) are obtained by emulsion polymerization of polymerizable unsaturated monomers with an azo compound as a radical polymerization initiator, and
- wherein the hydroxyl-containing resin (B) is selected from the group consisting of (i) a hydroxyl-containing acrylic resin having a weight-average molecular weight within a range of 1,000-200,000 and (ii) a hydroxyl-containing polyester resin having a weight-average molecular weight within a range of 1,000-200,000.
Dependencies are inferred from the claim text.