Ink composition, and method of forming pattern, color filter and method of preparing color filter using the same

A method of forming a pattern, comprising:

• applying an ink composition to a surface of a blanket;
• pressing the blanket, to which the ink composition is applied, to a substrate;
• and
• transferring the ink composition remaining on the surface of the blanket to a printing member,
• wherein the ink composition comprises a binder resin, a multifunctional monomer having an ethylenic unsaturated double bond, a coloring agent, a polymerization initiator represented by the following Formula 1, and a solvent:
• wherein each of R1, R2 and R3 is independently hydrogen, halogen, a linear, branched or cyclic alkyl group having 1 to 18 saturated or unsaturated carbon atoms, a linear, branched or cyclic alkoxy group having 1 to 18 saturated or unsaturated carbon atoms, an alkylcarbonyl group having 2 to 18 saturated or unsaturated carbon atoms, an alkoxycarbonyl group having 2 to 18 saturated or unsaturated carbon atoms, a carboxyl group, a mercapto group, a cyano group, a hydroxyl group, a nitro group, a saturated or unsaturated phenyl group, a saturated or unsaturated benzyl group, or a saturated or unsaturated naphthyl group, and
• X− is selected from the group consisting of a halogen ion, OH−, ClO4−, a sulfonate ion, a sulfate ion, a carbonate ion, a phosphate ion, a fluorophosphate ion, a borate ion, AlCl4−, BiF6−, a fluoroantimony ion, and a fluoroarsenic ion.