Patent ID: 7750096

Claim:
A process for the preparation of an aqueous polymer dispersion comprising reacting at least one olefin in the presence of at least one polymerization catalyst and one emulsifier in an aqueous medium, wherein the polymerization catalyst is produced in an in situ reaction by reacting the ligand compound 2,6-dichloro-para-benzoquinone (Ia) and/or 2,3,6-trichloro-para-benzoquinone (Ib) with a phosphine compound PR 3 ′, where R′ is hydrogen, C 1 -C 12 -alkyl, C 3 -C 12 -cycloalkyl, C 7 -C 15 -aralkyl or C 6 -C 14 -aryl, or with a diphosphine compound R 2 ′P-G-PR 2 ′, where R′ has the same meanings as in the phosphine compounds PR 3 ′ and G is a divalent radical, and with a metal compound of the formula M(L 2 ) 2 or M(L 2 ) 2 (L 1 ) z , where: M is a transition metal of groups 7 to 10 of the Periodic Table of the Elements, L 1 is selected from the group consisting of phosphanes (R 1 ) x PH 3-x and amines (R 1 ) x NH 3-x having identical or different radicals R 1 , diamines, ethers (R 1 ) 2 O, water, alcohols (R 1 )OH, pyridine, pyridine derivatives of the formula C 5 H 5-x (R 1 ) x N, carbon monoxide, C 1 -C 12 -alkylnitriles, C 6 -C 14 -arylnitriles and ethylenically unsaturated double bond systems, where x is an integer from 0 to 3, R 1 is hydrogen or C 1 -C 20 -alkyl, which in turn may be substituted by O(C 1 -C 6 -alkyl) or N(C 1 -C 6 -alkyl) 2 , or is C 3 -C 12 -cycloalkyl, C 7 -C 15 -aralkyl or C 6 -C 14 -aryl, L 2 is selected from the group consisting of halide ions, R 2 x NH 3-x , where x is an integer from 0 to 3 and R 2 is C 1 -C 12 -alkyl, C 1 -C 6 -alkyl anions, allyl anions, benzyl anions and aryl anions, where L 1 and L 2 may be linked to one another by one or more covalent bonds, z is from 0 to 4, and the polymerization of the at least one olefin is effected in an aqueous medium which comprises at least 50% by volume of water.