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US 7,732,505 B2Granted
Energy ray-curable ink composition
AssigneeHitachi Maxell, Ltd.
InventorsKatsuyuki Kito, Nagayuki Takao
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AssigneeHitachi Maxell, Ltd.
InventorsKatsuyuki Kito, Nagayuki Takao
Estimating the term…
An active energy ray-curable ink composition comprising a colorant, a monomer and a photopolymerization initiator, in which the monomer contains an acrylamide derivative in an amount of 10 to 90% by weight based on the whole weight of the ink composition, and the ink composition has a viscosity of 3 to 35 mPa·s at 25° C. The ink composition has a low viscosity without dilution by a diluent solvent, good storage stability, good pigment dispersibility when a pigment is used as a colorant and also good continuous ejection stability to a printing medium, has a good curing property at a low energy level such as a cumulative amount of light of 150 mJ/cm2 or less, and it can attain good printing quality on nonabsorbable printing medium and achieves good adhesion of printed images to the printing medium.
An active energy ray-curable ink composition comprising a colorant, a monomer and a photopolymerization initiator, wherein the monomer comprises an acrylamide derivative, which is a liquid at room temperature, and a tri- or higher polyfunctional acrylate monomer, an amount of the acrylamide derivative is 10 to 90% by weight and an amount of the tri- or higher polyfunctional acrylate monomer is 10 to 50% by weight, each based on the whole weight of the ink composition, and the ink composition has a viscosity of 3 to 35 mPa·s at 25° C.
Dependencies are inferred from the claim text.