Patent ID: 6881787

Claim:
A polymeric additive system comprising: a) a liquid component, and b) a solid component, the solid component comprising polymeric additive particles, the polymeric additive particles comprising: (i) a first population of polymer particles, and (ii) a second population of polymer particles, wherein the first population of polymer particles and the second population of polymer particles are derived from polymers derived from diene, diene/vinyl aromatic or crosslinked diene/vinyl aromatic monomers; polymers derived from (C 1 to C 20 )alkyl (meth)acrylates; copolymers derived from (C 1 to C 20 )alkyl (meth)acrylates; copolymers derived from (C 1 to C 20 )alkyl (meth)acrylates which vary in comonomer ratio; copolymers derived from (C 1 to C 20 )alkyl (meth)acrylates which vary in comonomer ratio to provide for differences in glass transition temperature; copolymers or blends containing copolymers derived from (C 1 to C 20 )alkyl (meth)acrylates mixed with EVA; and, copolymers or blends containing copolymers derived from (C 1 to C 20 )alkyl (meth)acrylates mixed with polyolefins; wherein the mean particle diameter of the first population of polymer particles is at least 50% larger than the mean particle diameter of the second population of particles, wherein the first population of polymer particles has a mean particle diameter of 300 to 50,000 nm, and wherein the compositions of the polymer particles in the first and second populations are essentially the same, and wherein the solid component is present in an amount of more than 50 weight percent, said weight percentage being based on the total weight of the polymeric additive system; and wherein the liquid component comprises at least 5 weight percent water, said weight percentage being based on the total weight of the polymeric additive system's liquid component.