Aqueous coating composition for improved liquid stain repellency

摘要

The present invention relates to a coating composition, especially, relates to an aqueous coating composition with improved liquid stain repellency, it has a fraction of critical pigment volume concentration of from 35% to 110%, and comprises (i) pigment composition, including 15 wt. %-100 wt. %, in percentage by weight based on the dry weight of the pigment composition, polymer-encapsulated pigment; and 0-85 wt. %, in percentage by weight based on the dry weight of the pigment composition, un-encapsulated pigment; and (ii) 0.01 wt. %-5 wt. %, in percentage by dry weight based on the wet weight of the aqueous coating composition, at least one paraffin wax emulsion.

主权项

1. An aqueous coating composition, wherein said aqueous coating composition has a pigment volume concentration of total titanium dioxide from 5% to 30%, has a fraction of critical pigment volume concentration of from 35% to 110%, and comprises:
(i) a pigment composition, including 15 wt. % to 100 wt. %, based on the dry weight of the pigment composition, of polymer-encapsulated titanium dioxide; and 0 to 85 wt. %, based on the dry weight of the pigment composition, of un-encapsulated titanium dioxide; wherein the polymer of the polymer-encapsulated pigment comprises 95 to less than 100 wt. % of copolymerized ethylenically unsaturated nonionic monomers comprising butyl acrylate and at least two ethylenically unsaturated monomers selected from methyl methacrylate, ethylhexyl acrylate, vinyl acetate, vinyl tert-decanoate, styrene, 2-(2-acetoacetyloxy)ethyl methacrylate, ureido methacrylate, and benzophenone; and greater than 0 and less than or equal to 5 wt. % of a copolymerized ethylenically unsaturated monomer selected from acrylic acid, itaconic acid, sodium vinyl sulfonate, acrylamide, and combinations thereof; wherein the polymer of the polymer-encapsulated titanium dioxide has a minimum film formation temperature (MFFT) of from −35° C. to 60° C.; and (ii) 0.01 wt. % to 1.3 wt. %, by dry weight based on the wet weight of the aqueous coating composition, of at least one paraffin wax emulsion.