Vinyl acrylic emulsion copolymer and use thereof in stain resistant coating compositions

An emulsion polymer composition comprising a population of sizes of polymeric particles, wherein the polymeric particles comprise a copolymer which comprises, in polymerized form:

• a) at least one vinyl acetate in an amount from 40 weight percent to 95 weight percent based on the overall weight of the polymeric particles;
• b) at least one ethylenically unsaturated monomer in an amount from 1.0 weight percent to 59.09 weight percent based on the overall weight of the polymeric particles;
• and
• c) at least one free radical polymerizable hydrolyzable silane monomer in an amount from 0.01 weight percent to 0.25 weight percent based on the overall weight of the polymeric particles,
• wherein the at least one ethylenically unsaturated monomer b) is not selected from a) or c),
• wherein the at least one free radical polymerizable hydrolyzable silane monomer is an ethylenically unsaturated silicon compound selected from the group consisting of vinyltrimethoxysilane, vinyltriethoxysilane, methacryloxypropyl trimethoxysilane, methacryloxypropyl triethoxysilane, and methacryloxypropyltripropoxysilane,
• wherein the population of sizes of polymeric particles comprises at least one mode,
• wherein each mode;
• comprises a respective weight average particle size Dwi as measured by disc centrifuge photosedimentometry and a respective number average particle size Dni as measured by disc centrifuge photosedimentometry and wherein for each modei, Dwi/Dni is 2.0 or less, and
• wherein the viscosity of the emulsion polymer composition is from 60 cps to 560 cps.