ORGANIC SOLVENT-BASED CONCENTRATED INK COMPOSITION FOR GRAVURE PRINTING AND GRAVURE PRINTING METHOD
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United States of America Patent
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Issued Date -
Apr 2, 2015
app pub date -
Apr 26, 2013
filing date -
Apr 27, 2012
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Abstract
The present invention provides an organic solvent-based concentrated ink composition for gravure printing which shows good print density, printability, and laminatability even in gravure printing using a shallow cylinder. The organic solvent-based concentrated ink composition for gravure printing mainly includes a pigment; binder resin; and an organic solvent. The pigment includes at least one of an organic pigment and an inorganic pigment. The binder resin includes polyurethane resin. A solution obtainable by dissolving 30 parts by mass of the polyurethane resin in 70 parts by mass of the organic solvent has a viscosity of 100 to 500 mPa·s/25° C. The concentrated ink composition has a viscosity of 10 to 1000 mPa·s/25° C. and has a viscosity in gravure printing of 12 to 23 s/25° C. in terms of the efflux time from a Zahn cup #3. The concentrated ink composition satisfies one of the following conditions 1 to 3:
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