Patent ID: 8501835

Claim:
A roll printing ink composition for transferring a pattern on a substrate of a display device, comprising: 2 to 15% by weight of a colorant, 1 to 20% by weight of a binder resin, 1 to 30% by weight of a polyfunctional monomer having at least one ethylenically unsaturated double bond, 0.1 to 5% by weight of an initiator, 50 to 90% by weight of a solvent system, and the residual of an additive; wherein the solvent system has an evaporation rate (V t ) of at least 0.1 mg/cm 2 -min and an absorption rate (S t ) into a blanket of less than 3.412 mg/cm 2 -min, as calculated by Equations 1 and 2, respectively: V t = W t A × t ( 1 ) where W t (mg) is the weight loss of the solvent, A(cm 2 ) is the area of a glass dish, and t(min) is the time when the solvent is left in air; and S t = W t - W 0 A 0 × t ( 2 ) where W 0 (mg) and W t (mg) are the initial and final weights of a polydimethyl-siloxane (PDMS) rubber layer measured before and after the PDMS rubber layer is dipped in the solvent for a given time (t) respectively, A 0 (cm 2 ) is the initial surface area of the PDMS rubber layer, and t(min) is the dipping time of the PDMS rubber layer.