# US 2017/0253754 A1 · Aqueous pigment dispersion and aqueous ink

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- Number: US 2017/0253754 A1
- Document ID: US20170253754A1
- Status: Published application
- Kind: A1
- Application number: 15/507,836
- Filed: 2015-08-25
- Published: 2017-09-07
- Earliest claimed: 2014-09-09
- Assignees: DIC Corporation
- Applicants: DIC Corporation
- Inventors: Yukihiko Kawaharada; Takaaki Nabe; Yoshinosuke Shimamura
- Web page: https://patentgrep.com/patent/US20170253754A1

## CPC

- C09D 11/14: based on carbohydrates
- B41J 2/01: Ink jet
- C09D 11/037: characterised by the pigment
- C09D 11/10: based on artificial resins
- C09D 11/102: containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds
- C09D 11/107: from unsaturated acids or derivatives thereof
- C09D 11/322: Pigment inks
- C09D 11/324: containing carbon black
- C09D 11/38: characterised by non-macromolecular additives other than solvents, pigments or dyes
- C09D 17/00: Pigment pastes, e.g. for mixing in paints (artists' paints C09D5/06)
- C09D 17/001: {in aqueous medium (C09D17/003, C09D17/004 take precedence)}
- 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

## Abstract

The present invention provides an aqueous pigment dispersion including at least a pigment, colloidal silica, bio-nanofibers having an average diameter of 1 nm to 100 nm and an aspect ratio of 100 or more, an anionic group-containing organic polymer compound, and also provides an aqueous ink. The bio-nanofibers are preferably cellulose nanofibers or chitosan nanofibers, and the ratio between the pigment, the colloidal silica, and the bio-nanofibers preferably satisfies (1) colloidal silica/pigment=1/100 to 20/100 or (2) colloidal silica/bio-nanofibers=1/2 to 10/1 and (3) bio-nanofibers/pigment=1/100 to 15/100.

## Claims

### Claim 1

An aqueous pigment dispersion comprising at least a pigment, colloidal silica, bio-nanofibers having an average diameter of 1 nm to 100 nm and an aspect ratio of 100 or more, an anionic group-containing organic polymer compound.

### Claim 2 (depends on 1)

The aqueous pigment dispersion according to claim 1, wherein the bio-nanofibers are cellulose nanofibers or chitosan nanofibers.

### Claim 3 (depends on 1)

The aqueous pigment dispersion according to claim 1, wherein the ratio between the pigment, the colloidal silica, and the bio-nanofibers satisfies the following:
(1) colloidal silica/pigment=1/100 to 20/100 or
(2) colloidal silica/bio-nanofibers=1/2 to 10/1 and
(3) bio-nanofibers/pigment=1/100 to 15/100.

### Claim 4 (depends on 1)

The aqueous pigment dispersion according to claim 1, wherein the anionic group-containing organic polymer compound is at least one selected from the group consisting of acrylic resins having anionic groups, polyurethane resins having anionic groups, and polysaccharide derivatives having anionic groups.

### Claim 5 (depends on 1)

An aqueous ink comprising the aqueous pigment dispersion according to claim 1.