Patent ID: 8114931

Claim:
An aqueous polymer dispersion comprising a) a polyurethane dispersion which has an average particle size of 60 to 350 nm and is the reaction product of A1) a polyisocyanate with A2) a polymeric polyol or a polyamine having an average molecular weight of 400 to 8000, A3) optionally a monoalcohol, a polyalcohol other than A2), a monoamine, a polyamine other than A2) or an aminoalcohol, and at least one of A4) a compound that contains at least one ionic or potential ionic group or A5) a nonionic hydrophilic compound, provided that if a monoamine is present, the monoamine is selected from the group consisting of diethylamine, dibutylamine, amino-functional polyethylene oxides and amino-functional polypropylene oxides, wherein the reaction product contains 7 to 45 wt. % of A1), 50 to 91 wt. % of A2). 0 to 30 wt. % of A3). 0 to 12 wt. % of A4) and 0 to 15 wt. % of A5), wherein the sum of A4) and A5) is 0.1 to 27 wt. % and the sum of A1) to A5) adds up to 100 wt. %; and b) an aqueous silicon dioxide dispersion having a particle diameter of the SiO 2 particles of 20 to 400 nm, wherein the aqueous polymer dispersion is an adhesive composition and comprises 80-93 wt. % of the polyurethane dispersion and 7-20 wt. % of the silicon dioxide dispersion.