Ink composition and image forming method

摘要

The invention provides an ink composition including:
(a) a polymer including a repeating unit (a1) having a group represented by the following Formula (1) and a repeating unit (a2) having a hydrophilic group;
(b) a radical polymerizable compound;
(c) water; and
(d) a colorant;
wherein, in Formula (1), each of R a and R b independently represents an alkyl group having from 1 to 4 carbon atoms; R a and R b may be bound to each other to form a 4- to 6-membered alicyclic structure; and * represents a bonding site.