# US 8,772,369 B2 · Single batch latex ink compositions and methods

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- Number: US 8,772,369 B2
- Document ID: US8772369B2
- Status: Granted
- Kind: B2
- Application number: 13/384,871
- Filed: 2009-12-04
- Published: 2012-09-13
- Granted: 2014-07-08
- Earliest claimed: 2009-12-04
- Assignees: Hewlett-Packard Development Company, L.P.
- Applicants: Doris Pik-Yiu Chun; Hou T. Ng
- Inventors: Doris Pik-Yiu Chun; Hou T. Ng
- Web page: https://patentgrep.com/patent/US8772369B2

## CPC

- C09B 67/0013: {with polymeric coatings}
- C09B 67/0084: {Dispersions of dyes}
- C09D 11/326: characterised by the pigment dispersant
- C09B: ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES {, e.g. PIGMENTS}; MORDANTS; LAKES (fermentation or enzyme using processes to synthesise a desired chemical compound C12P)
- 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

The present disclosure provides methods and composition directed towards a single batch latex ink-jet ink. In one embodiment, a method of manufacturing a single batch latex ink-jet ink can comprise emulsifying a pigment and a monomer in a solvent, and polymerizing the monomer with a reaction condition sufficient to encapsulate the pigment and sufficient to form individual latex particulates thereby forming a single batch latex ink-jet ink. The ink can contain less than about 0.5 wt % of latex particulates having a diameter of 50 nm or less, can contain about 1 wt % to about 10 wt % of latex particulates having a diameter of about 100 nm to about 250 nm and can contain about 3 wt % to about 5 wt % of encapsulated pigment.

## Claims

### Claim 1

A method of manufacturing a single batch latex ink-jet ink, comprising:
emulsifying a pigment and a monomer in a solvent to form an emulsion; and
polymerizing the monomer with a reaction condition sufficient to encapsulate the pigment and sufficient to form individual latex particulates, wherein the reaction condition sufficient to encapsulate the pigment and sufficient to form individual latex particles is decreasing an initiator loading for polymerization by adding a first amount of the initiator to initiate the polymerization and adding a second amount of initiator during polymerization such that the second amount is added over a period of at least 1 hour and wherein the second amount constitutes at least 30% of total initiator added; thereby forming a single batch latex ink-jet ink that includes less than about 0.5 wt % of latex particulates having a diameter of 50 nm or less, includes about 1 wt % to about 10 wt % of latex particulates having a diameter of about 100 nm to about 250 nm, and includes about 3 wt % to about 5 wt % of encapsulated pigment, wherein the weight percents are based on a total weight of the ink.

### Claim 2 (depends on 1)

The method of claim 1, wherein the single batch latex ink-jet ink contains less than about 0.1 wt % of the latex particulates having a diameter of 50 nm or less and contains about 3 wt % to about 6 wt % of the latex particulates having a diameter of about 100 nm to about 250 nm.

### Claim 3 (depends on 1)

The method of claim 1, wherein a ratio of polymerized monomer to pigment is at least 3:1 by weight.

### Claim 4 (depends on 1)

The method of claim 1, wherein the latex particulates have less than about 5 wt % of latex particulates having a diameter of greater than about 500 nm.

### Claim 5 (depends on 1)

The method of claim 1, further comprising filtering the single batch latex ink-jet ink through a 10 μm screen mesh before use.

### Claim 6 (depends on 1)

The method of claim 1, further comprising forming the emulsion by microfluidization having a liquid shear pressure of 1,000 to 30,000.

### Claim 7 (depends on 1)

The method of claim 1, further comprising dispersing the pigment and monomer by adding a dispersant.

### Claim 8 (depends on 1)

The method of claim 1, wherein the emulsion includes water and a surfactant.

### Claim 9 (depends on 1)

The method of claim 1, wherein the monomer includes a linear aliphatic acrylate, a branched aliphatic acrylate, or a cyclic aliphatic acrylate.

### Claim 10 (depends on 1)

The method of claim 1, wherein the encapsulated pigment and the latex particulates include at least one hydrophilic monomer and one hydrophobic monomer.

### Claim 11 (depends on 1)

The method of claim 1, wherein the polymerizing step includes adding a cross-linker.

### Claim 12 (depends on 1)

The method of claim 1, wherein the single batch latex ink-jet ink includes an organic co-solvent.

### Claim 13 (depends on 1)

The method of claim 1, wherein a size of the encapsulated pigment to a size of the latex particulate is 2:1 to 1:2.