Offset lithographic printing process with a water based ink
AssigneesSun Chemical Corporation, Heidelberg Harris, Inc.
InventorsRamasamy Krishnan, Marilyn C. Yamat, Hugo Babij, Roland T. Palmatier, Robert R. Murray
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Abstract
An offset lithographic printing process comprising printing at a relative humidity of 75-90% utilizing a water-based, single fluid, fountain solution free, printing ink containing (a) a macromolecular binder composed of binders soluble in water regardless of the pH of the water; resin rosin salt binders soluble in water at a pH from 7.5 to 10; and aqueous emulsion binders; (b) pigment and; (c) a re-wetting agent.
Claims13
An offset lithographic printing process comprising printing at a relative humidity of 75-90%, utilizing a water-based, single fluid, fountain solution free, offset printing ink having:
- (a) 10 to 70 wt. % of a macromolecular binder comprised of:
- (i) up to 5 wt. % of macromolecular binders soluble in water regardless of the pH of the water;
- (ii) 10-70 wt. % of macromolecular resin rosin salt binders soluble in water at a pH ranging from about 7.5 to about 10;
- and
- (iii) up to 20 wt. % macromolecular aqueous emulsion binders;
- (b) 2-30 wt. % pigment and;
- (c) 0.5-10 wt. % of a re-wetting agent.
Dependencies are inferred from the claim text.