Patent ID: 9334398
Filing Date: 2016-05-10
CPC Classification: C08F,C08L,C09D,D21H,Y10T

Claim Text:
1. An aqueous polymer dispersion, comprising: particles of a crosslinked or branched chain growth addition polymer; and a lignosulfonate; wherein the chain growth addition polymer comprises: not less than 50 wt % of at least one polymerized primary monomer selected from the group consisting of vinylaromatic compounds, conjugated aliphatic dienes, vinyl esters of saturated C at least one copolymerized branching or crosslinking monomer other than the at least one primary monomer which is selected from monomers having two or more free-radically polymerizable, ethylenically unsaturated groups; wherein the monomers are polymerized via free-radically initiated emulsion polymerization in the presence of the lignosulfonate and wherein a content of the lignosulfonate is from 10 to 100 parts by weight per 100 parts by weight of a total of the primary and the branching or crosslinking monomers.