Polyalkylene Glycol Block Copolymers Containing Phosphorus Groups And Use Thereof As Emulsifiers For Emulsion Polymerization

1 . An aqueous polymer dispersion comprising

(A) 1.0 to 70.0 wt % of a polymer composed of at least one olefinically unsaturated monomer and prepared by emulsion polymerization,

(B) 0.01 to 7 wt % of at least one polyalkylene glycol block copolymer of the formula (I)

in which

A is a hydrogen atom or a phosphate group —PO 3 M 2 ,

M is a hydrogen atom or a sodium, potassium or ammonium ion,

m is a number from 1 to 100 and

n is a number from 3 to 100, and

(E) water.

2 . The aqueous polymer dispersion as claimed in claim 1 , further comprising

(C) 0.01 to 5.0 wt % of at least one nonionic surfactant.

3 . The aqueous polymer dispersion as claimed in claim 1 , further comprising

(D) 0.01-10.0 wt % of further auxiliaries customary for the preparation of aqueous polymer dispersions, wherein the further auxiliaries are selected from the group consisting of additional wetting agents, protective colloids, solvents, defoamers, preservatives, buffer substances and pH regulators.

4 . The aqueous polymer dispersion as claimed in claim 2 , wherein component (C) is selected from the group consisting of fatty alcohol ethoxylates, di- and tristyrylphenol ethoxylates, fatty acid ethoxylates, esters of polyethylene glycols with fatty acids, fatty acid alkanolamide ethoxylates, EO/PO block copolymers, fatty alcohol EO/PO adducts, and endgroup-capped fatty alcohol ethoxylates.

5 . The aqueous polymer dispersion as claimed in claim 2 , wherein component (C) comprises ethoxylated, linear or branched, saturated or unsaturated C 8- to C 22 alcohols having 1 to 100 ethoxy groups.

6 . The aqueous polymer dispersion as claimed in claim 1 , having a viscosity of 10 to 10000 mPas, as determined using a cone/plate viscometer at a shear rate of 1/10 sec-1.

7 . The aqueous polymer dispersion as claimed in claim 1 , wherein component B is present in an amount of 0.01 to 7 wt %.

8 . The aqueous polymer dispersion as claimed in claim 1 , wherein component A is present in an amount of 1.0 to 70.0 wt %.

9 . (canceled)

10 . A pigment binder for producing formulations comprising at least one inorganic or organic pigment and at least one aqueous polymer dispersion as claimed in claim 1 .

11 . The aqueous polymer dispersion as claimed in claim 1 , wherein component B is present in an amount of 0.1 to 5 wt %.

12 . The aqueous polymer dispersion as claimed in claim 1 , wherein component B is present in an amount of 0.2 to 2 wt %.

13 . The aqueous polymer dispersion as claimed in claim 1 , wherein component A is present in an amount of 5.0 to 65.0 wt %.

14 . The aqueous polymer dispersion as claimed in claim 1 , wherein component A is present in an amount of 30.0 to 60.0 wt %.