Patent ID: 8093179

Claim:
A composition comprising a colour developer I: , wherein R 1 is phenyl or naphthyl, which can be unsubstituted or substituted by C 1 -C 8 alkyl, C 1 -C 8 -alkoxy or halogen; or C 1 -C 20 alkyl, which can be unsubstituted or substituted by C 1 -C 8 -alkoxy or halogen; X is a group of the formula —C(═NH)—, —C(═S)— or —C(═O)—; A is unsubstituted or substituted phenylene, naphthylene or C 1 -C 12 alkylene, or is an unsubstituted or substituted heterocyclic group; B is a linking group of formula —O—SO 2 —, —SO 2 —O—, —NH—SO 2 —, —SO 2 —NH—, —S—SO 2 —, —O—CO—NH—, —NH—CO—, —NH—CO—O—, —S—CO—NH—, —S—CS—NH—, —CO—NH—SO 2 —, —O—CO—NH—SO 2 —, —NH═CH—, —CO—NH—CO—, —S—, —CO—, —O—, —SO 2 —NH—CO—, —O—CO—O— and —O—PO—(OR 2 ) 2 ; and R 2 is aryl, which can be unsubstituted or substituted by C 1 -C 8 alkyl, halogen-substituted C 1 -C 8 alkoxy-substituted C 1 -C 8 alkoxy, halogen-substituted C 1 -C 8 alkoxy or halogen; or benzyl, which can be substituted by C 1 -C 8 alkyl, halogen-substituted C 1 -C 8 alkyl, C 1 -C 8 alkoxy-substituted C 1 -C 8 alkoxy, halogen-substituted C 1 -C 8 alkoxy or halogen; or C 1 -C 20 alkyl, which can be unsubstituted or substituted by C 1 -C 8 alkoxy, halogen, phenyl or naphthyl; and a) 0.1 to 5 dry parts by weight of an anionic dispersant per 100 dry parts of the colour developer I, wherein the anionic dispersant is an ammonium salt of naphthalene sulfonic acid formaldehyde condensate, a carboxylated polymer, a carboxylated acrylic copolymer, or a mixture thereof; and b) 0.01 to 2.0 dry parts per weight of a thickening agent per 100 parts of the colour developer I.