Patent ID: 8071672

Claim:
A resin composition, comprising components (a)-(c): Component (a): a pigment, Component (b): a polymer comprising a hydroxyl group, Component (c): a polymer comprising an acidic group or basic group or a salt thereof, wherein the mass proportion of the component (a) is not lower than 60% by mass and not higher than 90% by mass, wherein the mass proportion of the component (b) is not lower than 5% by mass and not higher than 20% by mass and wherein the mass proportion of the component (c) is not lower than 5% by mass and not higher than 20% by mass, with the sum of the components (a)-(c) being taken as 100%, wherein the component (a) pigment is carbon black having an average primary particle diameter of not smaller than 10 nm and not larger than 50 nm.