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US 9,868,869 B2Granted
Ink composition for use on non-absorbent surfaces
AssigneeR.R. Donnelley & Sons Company
InventorsStanley Litman, Pamela Geddes, Morgan Edwards, Michael Carson, Jr., Kevin J. Hook
Life of this patent
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Abstract
According to one aspect, an ink composition includes a colorant, one or more polymers such as a polyurethane siloxane, a surfactant, water, and a solvent. The ink composition has a total solids content of less than about 20% by weight. Further the ink has an initial surface tension of less than about 50 dynes per centimeter on application and the surface tension on drying should not increase by more than 20 percent.
Claims12
An aqueous ink comprising:
- from about 3 to about 15% by weight of a first urethane silanol polymer and a second urethane silanol polymer;
- from about 0.5 to about 12% by weight of one or more colorants;
- from about 5 to about 35% by weight of ethylene glycol;
- from about 0.03 to about 1.0% by weight of a pH modifier;
- and
- water, wherein the aqueous ink has a viscosity from about 1 to about 20 mPa-s such that the aqueous ink can be applied to a non-absorbent surface in a layer, and wherein the ink has a dynamic surface tension at 25 degrees Celsius from about 20 to about 45 dynes/cm, wherein the first urethane silanol polymer is polycarbonate based.
3 more elements
An aqueous ink comprising:
- from about 3 to about 15% by weight of a first urethane silanol polymer and a second urethane silanol polymer;
- from about 0.5 to about 12% by weight of one or more colorants;
- from about 5 to about 35% by weight of ethylene glycol;
- from about 0.03 to about 1.0% by weight of a pH modifier;
- and
- water, wherein the aqueous ink has a viscosity from about 1 to about 20 mPa-s such that the aqueous ink can be applied to a non-absorbent surface in a layer, and wherein the ink has a dynamic surface tension at 25 degrees Celsius from about 20 to about 45 dynes/cm, wherein the first urethane silanol polymer is polycarbonate based.
3 more elements
A method for high speed variable printing comprising the steps of:
- providing an aqueous ink, the aqueous ink comprising:
- from about 3 to about 15% by weight of a first urethane silanol polymer and a second urethane silanol polymer, wherein the first urethane silanol polymer is polycarbonate based;
- from about 0.5 to about 12% by weight of a pigment;
- from about 5 to about 35% by weight of ethylene glycol;
- from about 0.03 to about 1.0% by weight of a pH modifier;
- and
- water, wherein the aqueous ink has a viscosity from about 1 to about 20 mPa-s, and wherein the ink has a dynamic surface tension at 25 degrees Celsius from about 20 to about 45 dynes/cm;
- and
- applying the aqueous ink onto a non-absorbent substrate in a first layer.
6 more elements
Dependencies are inferred from the claim text.