Patent ID: 7438404

Claim:
An ink-jet recording ink comprising colored fine particles including an oil-soluble dye and an oil-soluble polymer, and a compound represented by formula (I): wherein, in formula (I), R represents a hydrophobic group or a group derived from a hydrophobic polymer; X represents a divalent linking group having a hetero-bond; Y represents a group including at least one represented by the following structural units A, C and D, and the following structural unit B at 0 to 40% by mole; and n is an integer of 10 to 3,500; wherein, in the structural units A, B, C and D, R 1 represents a hydrogen atom or a C 1 -C 6 alkyl group; R 2 represents a hydrogen atom or a C 1 -C 10 alkyl group; R 3 represents a hydrogen atom or a methyl group; R 4 represents a hydrogen atom, —CH 3 , —CH 2 COOH (including an ammonium salt or an alkali metal salt thereof) or —CN; Z 1 represents a hydrogen atom, —COOH (including an ammonium salt or an alkali metal salt thereof or —CONH 2 ; Z 2 represents —COOH (including an ammonium salt or an alkali metal salt thereof, —SO 3 H (including an ammonium salt or an alkali metal salt thereof), —OSO 3 H (including an ammonium salt or an alkali metal salt thereof), —CH 2 SO 3 H (including an ammonium salt or an alkali metal salt thereof), —CONHC(CH 3 ) 2 CH 2 SO 3 H (including an ammonium salt or an alkali metal salt thereof) or —CONHCH 2 CH 2 CH 2 N + (CH 3 ) 3 Cl − .