Patent ID: 6870001

Claim:
An aqueous polymer dispersion comprising an emulsifier mixture and water, and wherein the emulsifier mixture comprises: A) an emulsifier I of formula (I) wherein X is O, S, CH 2 , NH or NR 7 ; one or two of the radicals R 1 to R 6 are a group SO 3 ⊖ K ⊕ , and the remainder of R 1 to R 6 are independently H or a C 1 -C 18 alkyl group; R 7 is a C 1 -C 18 alkyl group and K is a countercation; B) an emulsifier II of the formula (II) R 8 —O—(Z—O) n —SO 3 ⊖ K ⊕ (II), wherein R 8 is C 1 -C 18 alkyl, n is an integer from 1 to 50, and Z is CH 2 -CH 2 or K is a cation; and C) a nonionic emulsifier III of formula (III) R 9 —O—(Z—O) n —H (III), wherein R 9 is a C 1 -C 15 alkyl group, Z is CH 2 CH 2 or CH(CH 3 )CH 2 and n is an integer from 1 to 50.