Water borne coating compositons and polymers therefor

Abstract

Copolymers and latex paint compositions using such copolymers that are heat-age stable and provide good adhesion, block resistance, and hiding all while using lower amounts of pigment are described herein. In one aspect, the heat-age stable compositions include an acrylic, styrene acrylic, vinyl acrylic copolymer or blends thereof including, as additional polymerizable units, at least one polymerizable phosphate surfactant and at least one linear or branched hydrophobic monomer that are both polymerized into the acrylic, styrene acrylic, vinyl acrylic copolymer backbone.

What is claimed is: 
     
         1 . A heat-age stable latex paint composition comprising:
 a polymer including as polymerized units vinyl acetate; a phosphate surfactant selected from a propoxylated or ethoxylated phosphate acrylate surfactant, a propoxylated or ethoxylated phosphate methacrylate surfactant, or mixtures thereof; and at least one vinyl ester with a C4 to C30 linear or branched carbon chain;   titanium dioxide;   water; and   wherein the heat-age stable latex paint composition has a KU viscosity increase as measured by ASTM D562 of no more than about 10 units after 4 weeks of aging at about 140° F.   
     
     
         2 . The heat-age stable latex paint composition of  claim 1 , wherein the heat-age stable latex paint composition, when dried as a film, exhibits a contrast ratio as tested by ASTM D2805-11 of about 0.9 to about 0.99 when the heat-age stable latex paint composition has a particle loading factor based on a weight ratio of the titanium dioxide to the polymer of greater than 1:2. 
     
     
         3 . The heat-age stable latex paint composition of  claim 1 , wherein the heat-age stable latex paint composition, when dried as a film, has an increased contrast ratio relative to a dried film of a comparative latex paint composition that does not include the polymer but instead includes a vinyl acrylic latex polymer without the phosphate surfactant and includes about 13 to about 20 weight percent more titanium dioxide. 
     
     
         4 . The heat-age stable latex paint composition of  claim 1 , wherein the heat-age stable latex paint composition, when dried as a film, exhibits a y-reflectance as tested by ASTM D2805-11. of about 90 to about 100 when the heat-age stable latex paint composition has a particle loading factor based on a weight ratio of the titanium dioxide particle to the polymer of greater than 1:2. 
     
     
         5 . The heat-age stable latex paint composition of  claim 1 , wherein the heat-age stable latex paint composition, when dried as a film, has an increased y-reflectance relative to a dried film of a comparative latex paint composition that does not include the polymer but instead includes a vinyl acrylic latex polymer without the phosphate surfactant and includes about 13 to about 20 weight percent more titanium dioxide. 
     
     
         6 . The heat-age stable latex paint composition of  claim 1 , wherein the heat-age stable latex paint composition includes about 30 to about 50 weight percent of the polymer and about 10 to about 25 weight percent of the titanium dioxide. 
     
     
         7 . The heat-age stable latex paint composition of  claim 1 , wherein the polymer further includes as polymerized units ureido monomers, amino monomers, sulfonate monomers or sulfonate surfactants, silane monomers, phosphate monomers, carboxyl monomers or carboxyl surfactants, and combinations thereof. 
     
     
         8 . The heat-age stable latex paint composition of  claim 1 , wherein the vinyl ester with a C4 to C30 linear or branched carbon chain includes isobutyl acrylate or isobutyl methacrylate, tertiary butyl acrylate or tertiary butyl methacrylate, ethyl hexyl acrylate or ethyl hexyl methacrylate, lauryl acrylate or lauryl methacrylate, octyl acrylate or octyl methacrylate, isooctyl acrylate or isooctyl methacrylate, dibutyl maleate, dioctyl maleate, vinyl neodecanoate, and combinations thereof. 
     
     
         9 . The heat-age stable latex paint composition of  claim 1 , wherein at least a portion of the phosphate surfactant is polymerized adjacent to the vinyl ester with a C4 to C30 linear or branched carbon chain. 
     
     
         10 . The heat-age stable latex paint composition of  claim 1 , wherein the polymer further includes as polymerized units allyl imidazolidinone, ally hydroxypropyl sodium sulfate, and combinations thereof. 
     
     
         11 . The heat-age stable latex paint composition of  claim 1 , wherein the polymer includes about 0.5 to about 5 weight percent of the phosphate surfactant and about 5 to about 20 weight percent of the vinyl ester with a C4 to C30 linear or branched chain. 
     
     
         12 . The heat-age stable latex paint composition of  claim 11 , wherein the polymer includes about 60 to about 80 weight percent of the vinyl acetate. 
     
     
         13 . The heat-age stable latex paint composition of  claim 11 , further comprising a weight ratio of the phosphate surfactant to the vinyl ester with a C4 to C30 linear or branched carbon chain of about 1:5 to about 1:20. 
     
     
         14 . The heat-age stable latex paint composition of  claim 1 , wherein the phosphate surfactant has a weight average molecular weight of about 300 to about 1500. 
     
     
         15 . A heat-age stable latex paint composition comprising
 a polymer including as polymerizable units vinyl acetate; a phosphate surfactant having a weight average molecular weight of about 300 to about 1500 and selected from a propoxylated or ethoxylated phosphate acrylate surfactant, a propoxylated or ethoxylated phosphate methacrylate surfactant, or mixtures thereof; and at least one vinyl ester with a C4 to C30 linear or branched carbon chain;   titanium dioxide;   water; and   wherein the heat-age stable latex paint composition exhibits a KU viscosity increase as measured by ASTM D562 of no more than about 10 units after 4 weeks of aging at about 140° F. and wherein the heat-age stable latex paint composition, when dried as a film, exhibits a contrast ratio as tested by ASTM D2805-11 of about 0.9 to about 0.99 when the heat-age stable latex paint composition has a particle loading factor based on a weight ratio of the titanium dioxide to the polymer of greater than 1:2.   
     
     
         16 . The heat-age stable latex paint composition of  claim 15 , wherein the latex paint composition, when dried as a film, exhibits a y-reflectance as tested by ASTM D2805-11 of about 90 to about 100 when the heat-age stable latex paint composition has a particle loading factor based on a weight ratio of the titanium dioxide particle to the polymer of greater than 1:2. 
     
     
         17 . The heat-age stable latex paint composition of  claim 15 , wherein the latex paint composition, when dried as a film, has an increased contrast ratio relative to a dried film of a comparative latex paint composition that does not include the polymer but instead includes a vinyl acrylic latex polymer without the phosphate surfactant and includes about 13 to about 20 weight percent more titanium dioxide. 
     
     
         18 . The heat-age stable latex paint composition of  claim 15 , wherein the latex paint composition, when dried as a film, has an increased y-reflectance relative to a dried film of a comparative latex paint composition that does not include the polymer but instead includes a vinyl acrylic latex polymer without the phosphate surfactant and includes about 13 to about 20 weight percent more titanium dioxide. 
     
     
         19 . The heat-age stable latex paint composition of  claim 15 , wherein the heat-age stable latex paint composition includes about 30 to about. 50 weight percent of the polymer and about 10 to about 25 weight percent of the titanium dioxide. 
     
     
         20 . The heat-age stable latex paint composition of  claim 15 , wherein the polymer includes about 0.5 to about 5 weight percent of the phosphate surfactant and about 5 to about 20 weight percent of the vinyl ester with a C4 to C30 linear or branched chain. 
     
     
         21 . The heat-age stable latex paint composition of  claim 20 , wherein the polymer includes about 60 to about 80 weight percent of vinyl acetate.