Patent ID: 6849679

Claim:
A composition comprising a) 0.1-99.9% by weight of a combination of dispersing agents consisting essentially of i) a block copolymer of the formula X—A x —B y —Y (I), wherein X and Y represent chain terminal groups from fragments of a polymerization initiator containing the group wherein X′ is cleavable from the initiator as a free radical X. and is capable of initiating the polymerization of ethylenically unsaturated monomers; or one of X and Y represents the fragment of a free radical initiator and the other one represents the chain terminal group from the free nitroxyl radical A and B represent different polymer blocks composed of non-ionic repeating units of ethylenically unsaturated monomers, wherein one of the polymer blocks A or B additionally contains repeating units of ethylenically unsaturated monomers substituted with ionic groups; x and y represent numerals greater than zero and define the number of monomer repeating units in polymer blocks A and B; and (ii) a salt forming component selected from the group consisting of mono-, bi- or tricyclic sulphonic, carboxylic or phosphonic acids, aliphatic sulphonic, carboxylic or phosphonic acids substituted with mono- bi- or tricyclic groups, alkyl halides substituted with mono-, bi- or tricyclic groups, and C 1 -C 4 alkyl esters of mono-, bi- or tricyclic sulphonic acids, wherein the mono-, bi-, or tricyclic groups present in the sulphonic, carboxylic and phosphonic acids or the mono, bi- or tricyclic substituents of the aliphatic sulfonic, carboxylic, phosphonic acids and alkyl halides are selected from the group consisting of saturated or unsaturated mono- or bi-, or tricycloaliphatic, heteromonocycloaliphatic or heterobicycloaliphatic, carbomonocyclic or carbobicyclic aromatic, partially saturated carbobicyclic aromatic, heteromonocyclic or heterobicyclic aromatic and partially saturated heterobicyclic aromatic groups, wherein component i) and ii) are different; and b) 0.1-99.9% by weight of dispersible inorganic or organic pigment particles.