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US 5,401,303 AGranted
Aqueous inks having improved halo characteristics
AssigneeE. I. Du Pont de Nemours and Company
InventorsJohn L. Stoffel, David H. Donovan, Loren E. Johnson, John R. Moffatt
Life of this patent
Estimating the term…
Abstract
Halo effect seen at the interface between a first ink, exhibiting sharp edge acuity, and a second ink, having low surface energy, is addressed by adding certain fluorocarbon compounds to the first ink. Edge acuity of the first ink is maintained.
Claims25
An ink set for printing at least two distinct colors on a print medium, said ink set comprising:
- (a) a first ink exhibiting sharp edge acuity when printed on said medium, said ink containing at least one fluorinated compound of the formula:
- [R(f)Q].sub.n A
- wherein,
- R(f) is a perfluoroalkyl group having 6 to 22 carbon atoms;
- Q is a divalent bridging group;
- A is a water-soluble group;
- and
- n is 1 or 2,
- in an amount effective to reduce the surface energy of the first ink to within approximately 15 dynes/cm of a said second ink, thereby reducing halo effect, and
- (b) a second ink having a surface energy of less than 40 dynes/cm.
7 more elements
A process for applying or printing at least two distinct colors on a print medium wherein halo between said two distinct colors is alleviated, comprising:
- (1) printing a first ink that exhibits sharp edge acuity when printed on said medium, said ink containing a fluorinated compound of the formula:
- [R(f)Q].sub.n A
- wherein,
- R(f) is a perfluoroalkyl group having 6 to 22 carbon atoms;
- Q is a divalent bridging group;
- A is a water-soluble group;
- and
- n is 1 or 2,
- in an amount effective to reduce the surface energy of said first ink to within approximately 15 dynes/cm of a second ink, thereby reducing halo effect, and
- (2) printing adjacent to said first ink a second ink having a surface tension less than 40 dynes/cm.
7 more elements
Dependencies are inferred from the claim text.