Patent ID: 7531597

Claim:
The formulation comprising: a polymer (a), polyionic in the pH conditions of the formulation, being polycationic or polyanionic, a compound (b), ionic in the pH conditions of the formulation, a di-block (block A)(block B) copolymer (c), comprising at least two moieties A and B, wherein: block A is a polyionic block in the pH conditions of the formulation, being polycationic if compound (b) is anionic, and polyanionic if compound (b) is cationic, block B is a neutral block in the pH conditions of the formulation, and at least one block selected from the group consisting of block A and block B comprises units deriving from mono-alpha-ethylenically-unsaturated monomers, and the polyanionic block comprises repeating units derived from monomers such as acrylic acid, methacrylic acid, vinyl subphonic acid, salts of vinyl sulfonic acid, vinylbenzene sulphonic acid, salts of vinylbenzene sulphonic acid, alpha-acrylamidomethylpropanesulphonic acid, salts of alpha-acrylamidomethylpropanesulphonic acid, 2sulphoethyl methacrylate, salts of 2sulphoethyl methacrylate, acrylamido-2-methylpropanesulphonic acid (AMPS), salts of acrylamido-2-methylpropanesulphonic acid, and styrenesulphonate (SS), and water.