Patent ID: 9605188
Date: 2017-03-28
CPC Classifications: C08L,C09J,Y10T

Claim:
1. An aqueous adhesive dispersion, comprising: a dispersed adhesive polymer; and a tackifier polymer, dispersed in water, having a weight-average molecular weight of less than 50,000 and a glass transition temperature of greater than or equal to −40° C. to less than or equal to −2° C., wherein the tackifier polymer increases a tack of said adhesive polymer and is obtained by emulsion polymerization in the presence of at least one chain transfer agent and obtained from a monomer mixture consisting of: monomer (a) at least 85% by weight of a mixture of methyl methacrylate and at least one monomer selected form the group consisting of n-butyl acrylate and 2-ethylhexyl acrylate, monomer (b) from 0% to 14.9% by weight of a vinylaromatic, monomer (c) at least 0.1% by weight of an acid monomer, and monomer (d) from 0% to 14.9% by weight of at least one additional monomer selected from the group consisting of a C1 to C20 hydroxyalkyl (meth)acrylate, a vinyl ester of a carboxylic acid comprising up to 20 C atoms, an ethylenically unsaturated nitrile, a vinyl halide, a vinyl ether of an alcohol comprising 1 to 10 C atoms, an aliphatic hydrocarbon having 2 to 8 C atoms and one or two double bonds and (meth)acrylamide, based in each case on a sum of all monomers: