# US 6,293,667 B1 · Process for producing an image on a substrate

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 6,293,667 B1
- Document ID: US6293667B1
- Status: Granted
- Kind: B1
- Application number: 09/165,130
- Filed: 1998-10-02
- Granted: 2001-09-25
- Earliest claimed: 1997-10-24
- Assignees: Zeneca Limited
- Inventors: Peter Gregory; John Reginald Provost
- Web page: https://patentgrep.com/patent/US6293667B1

## CPC

- C09D 11/328: characterised by dyes
- B41J 2/01: Ink jet
- B41M 3/001: {using chemical colour-formers or chemical reactions, e.g. leuco dyes or acids}
- 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)
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41M: PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING, (correction of typographical errors B41J; processes for applying transfer pictures or the like B44C1/16; fluid media for correction of typographical errors by coating C09D10/00; printing textiles D06P)

## Abstract

A process for producing an image on a substrate comprising printing an ink onto the substrate, characterized in that the ink contains a reactive dye, the substrate is an acid paper and the printing is performed by an ink jet printer. Also claimed is an acid paper printed by means of the process.

## Claims

### Claim 1

A process for producing an image on a substrate comprising printing an ink onto the substrate, characterized in that the ink contains a reactive dye containing one or more reactive groups selected from halotriazine, vinylsulphone, sulphatoethylsulphone and halopyrimidine groups, the substrate is an acid paper and the printing is performed by an ink-jet printer.

### Claim 2 (depends on 1)

A process according to claim 1 wherein the reactive dye comprises one or more azo, anthraquinone, triphendioxazine, formazan or phthalocyanine chromophores and one or more chlorotriazine groups.

### Claim 3 (depends on 1)

A process according to claim 1 wherein the reactive dye has been purified by removal of substantially all of the inorganic salts and by-products resulting from it synthesis.

### Claim 4 (depends on 1)

A process according to claim 1 wherein the ink comprises:
(a) from 0.01 to 30 parts in total of one or more reactive dye(s); and
(b) from 70 to 99.99 parts of a liquid medium;
wherein all parts are by weight and the number of parts of (a)+(b)=100.

### Claim 5 (depends on 4)

A process according to claim 4 wherein component (b) of the ink comprises a mixture of water and an organic solvent.

### Claim 6 (depends on 1)

A process according to claim 1 wherein the ink has a concentration of less than 100 parts per million in total of halide ions and divalent and trivalent metals.

### Claim 7 (depends on 1)

A process according to claim 1 wherein the printer is a piezoelectric ink jet printer or thermal ink jet printer.

### Claim 8 (depends on 1)

A process according to claim 1 wherein the acid paper is a paper which is inherently acidic or a paper having an acidic coating.

### Claim 9 (depends on 1)

A process according to claim 1 wherein the acid paper has a thickness of from 50 to 500 microns.

### Claim 10 (depends on 1)

A process according to claim 1, wherein the pH of the acid paper is from 3 to 6.9.

### Claim 11 (depends on 1)

A process according to claim 1 wherein the acid paper is rosin sized.

### Claim 12 (depends on 1)

A process according to claim 1 wherein the acid paper is rosin sized, has a pH of from 3.9 to 6.1 and a thickness of 100 to 125 microns.

### Claim 13 (depends on 1, 2)

An acid paper printed by means of the process according to either claim 1 or claim 2.

### Claim 14

A printer comprising paper, an ink cartridge containing an ink, and a means for ink jet printing the ink onto the paper, wherein the ink contains a reactive dye and the paper is an acid paper.

### Claim 15 (depends on 14)

A printer according to claim 14 wherein the acid paper is rosin sized.

### Claim 16 (depends on 1)

A process as claimed in claim 1, wherein the reactive dye contains one or more cellulose reactive groups selected from chlorotriazine, fluorotriazine, fluoropyrimidine and chloropyrimidine groups.