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US 7,407,541 B2Granted
Inkjet dye design
AssigneeHewlett-Packard Development Company, L.P.
InventorLarrie A Deardurff
Life of this patent
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Abstract
Magenta chromophore dyes which are stabilized by adding steric hindering groups to protect the imino carbons; nonlimiting examples of the steric hindering groups being phenyl, methyl, ethyl, isopropyl, fluoride, chloride, bromide and iodide groups.
Claims8
A magenta ink for ink-jet printing, comprising a dye having the following structure:
- wherein R1 is selected from the group consisting of ethyl, isopropyl, isobutyl, phenyl and substituted phenyl;
- R2 is selected from the group consisting of methyl, ethyl, propyl, isopropyl and halogen;
- R3 is selected from the group consisting of H, SO3H, COOH, and a polyether group
- where n is from 2 to 100;
- and
- R4 is selected from the group consisting of H, SO3H, COOH, CH2SO3H, CH2COOH, C2H4SO3H and C2H4COOH.
3 more elements
A method for ink-jet printing, comprising:
- providing at least one magenta ink containing at least one magenta dye having a visible light absorbance of 0.01 to 0.57 at lambdamax at a 1:10,000 dilution in water and having a structure as follows:
- wherein R1 is selected from the group consisting of ethyl, isopropyl, isobutyl, phenyl and substituted phenyl;
- R2 is selected from the group consisting of methyl, ethyl, propyl, isopropyl and halogen;
- R3 is selected from the group consisting of H, SO3H, COOH, and a polyether group
- where n is from 2 to 100;
- and
- R4 is selected from the group consisting of H, SO3H, COOH, CH2SO3H, CH2COOH, C2H4SO3H and C2H4COOH;
- and
- printing said ink on a printing medium by means of an ink-jet pen.
6 more elements
Dependencies are inferred from the claim text.