Ink for inkjet recording

摘要

An ink for inkjet recording includes water; a hydrosoluble solvent, a pigment, and a copolymer including a salt of a diphosphonic acid group. The copolymer including a salt of a diphosphonic acid group includes structural units having the following formulae (1) and (2):
X represents an alkylene group having 1 to 3 carbon atoms, each of R 1 and R 2 represents a hydrogen atom or a methyl group, M + represents an alkali metal ion, an organic ammonium ion or a proton and Z 1 represents a hydrocarbon group having 6 to 22 carbon atoms. The alkali metal ion or the organic ammonium ion and the proton may be mixed, and half or more of the M + are alkali metal ions or the organic ammonium ions.