# US 7,744,205 B2 · Solvent/latex binder system for heated inkjet printing

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- Number: US 7,744,205 B2
- Document ID: US7744205B2
- Status: Granted
- Kind: B2
- Application number: 11/378,195
- Filed: 2006-03-17
- Published: 2007-09-20
- Granted: 2010-06-29
- Earliest claimed: 2006-03-17
- Assignees: Hewlett-Packard Development Company, L.P.
- Inventors: George M. Sarkisian; Phillip C. Cagle
- Web page: https://patentgrep.com/patent/US7744205B2

## CPC

- C09D 11/54: Inks based on two liquids, one liquid being the ink, the other liquid being a reaction solution, a fixer or a treatment solution for the ink
- C09D 11/30: Inkjet printing inks
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)

## Abstract

An inkjet ink system includes an anionic jettable ink, and a cationic fixer fluid, wherein the anionic jettable ink includes between 0 and 4% styrene-acrylic or acrylic binder, between 0.3 and 10% latex binder, between 1 and 6% colorant, between 1 and 40% solvent with a vapor pressure less than 0.01 mm Hg at 25° C., and water.

## Claims

### Claim 1

An inkjet ink system, comprising:
an anionic jettable ink; and
a cationic fixer fluid;
in which said anionic jettable ink includes between 0 and 4% styrene-acrylic or acrylic binder having an acid number below 250, between 0.3 and 10% latex binder having a plurality of particles with a mean particle size between approximately 100 and 300 nm and a glass transition temperature between −20 and +100° C., between 1 and 6% anionic colorant, between 1 and 40% solvent with a vapor pressure less than 0.01 mm Hg at 25° C., and water;
in which said cationic fixer fluid includes a crashing agent and a vehicle, and
in which said plurality of latex binder particles include surface acid groups.

### Claim 2 (depends on 1)

The inkjet ink system of claim 1, wherein said crashing agent comprises one of a multivalent metal salt, an acidic crashing agent, or a polymeric ionic crashing agent.

### Claim 3 (depends on 1)

The inkjet ink system of claim 1, wherein said inkjet ink system is free of 1,2-hexanediol.

### Claim 4

A method of printing an inkjet image in a heated environment, comprising:
selectively inkjetting an anionic inkjet ink at a desired substrate; and
fixing said anionic inkjet ink on said desired substrate with a cationic fixer fluid;
in which said anionic jettable ink includes between 0 and 4% styrene-acrylic or acrylic binder having an acid number below 250, between 0.3 and 10% latex binder having a plurality of particles with a mean particle size between approximately 100 and 300 nm and a glass transition temperature between −20 and +100° C., between 1 and 6% anionic colorant, between 1 and 40% solvent with a vapor pressure less than 0.01 mm Hg at 25° C., and water, and
in which said plurality of latex binder particles include surface acid groups.

### Claim 5 (depends on 4)

The method of claim 4, wherein said anionic jettable ink is free of 1,2-hexanediol.

### Claim 6 (depends on 4)

The method of claim 4, wherein fixing said anionic inkjet ink on said desired substrate with a cationic fixer comprises overprinting said desired substrate with said cationic fixer.

### Claim 7 (depends on 4)

The method of claim 4, wherein fixing said anionic inkjet ink on said desired substrate with a cationic fixer comprises underprinting said desired substrate with said cationic fixer.