Patent ID: 8334341

Claim:
A liquid developer containing a pigment dispersion, the pigment dispersion composition comprises a silicon dispersion medium containing a carbodiimide compound wherein the carbodiimide compound comprises a polysiloxane chain as a side chain, and wherein the polysiloxane chain is introduced by reaction of a functional group of a polysiloxane chain-containing compound having the functional group reactive with a carbodiimide group with a carbodiimide group of a carbodiimide compound having a carbodiimide equivalent weight of 100 to 50000, wherein a polysiloxane chain-containing polymer comprising an acid group in one terminal of the molecule and obtained by polymerization of a no acid group-containing radical polymerizable compound containing at least one kind of no acid group-containing polysiloxanes having radical polymerizable unsaturated bonds at the terminals in the presence of a thiol acid group-containing chain transfer agent is used as said polysiloxane chain-containing compound.