NOVEL COPOLYMER, AQUEOUS INK, AND INK CARTRIDGE

摘要

To provide a copolymer including: a structural unit represented by the following General Formula (1) where X represents a hydrogen atom or a cation; a structural unit expressed by the following Structural Formula (1); and a structural unit represented by the following General Formula (2) where R is a hydrogen atom or a methyl group, L is a single bond or -(CH2)n-O-CO- where n is an integer in a range of from 2 through 18, and a carbonyl carbon atom in the -(CH2)n-O-CO- is bound to naphthyl.