# US 2025/0084262 A1 · Method for producing aqueous dispersion, aqueous dispersion, and aqueous ink

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- Number: US 2025/0084262 A1
- Document ID: US20250084262A1
- Status: Published application
- Kind: A1
- Application number: 18/830,045
- Filed: 2024-09-10
- Published: 2025-03-13
- Earliest claimed: 2023-09-12
- Assignees: Riso Kagaku Corporation
- Applicants: Riso Kagaku Corporation
- Inventors: Seigou KAWAGUCHI; Yoshifumi WATANABE; Shinsuke OZAWA; Hideki IMANISHI
- Web page: https://patentgrep.com/patent/US20250084262A1

## CPC

- C09D 7/80: Processes for incorporating ingredients
- C09D 11/107: from unsaturated acids or derivatives thereof
- C09D 11/322: Pigment 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

A method for producing an aqueous dispersion is disclosed, the method including: obtaining an aqueous titanium oxide dispersion containing titanium oxide particles, a dispersant, and water; and obtaining titanium oxide composite particles by adding a polymerizable monomer and a polymerization initiator to the aqueous titanium oxide dispersion to polymerize the polymerizable monomer, in which the obtaining of the titanium oxide composite particles includes adding the polymerizable monomer at a mass ratio of 1/5 or more relative to the total amount of the titanium oxide particle at one time, and the polymerizable monomer contains a polymerizable monomer A of which solubility in water is 0.5 g/100 ml or less at 23° C. An aqueous dispersion and an aqueous ink are also disclosed.

## Claims

### Claim 1

A method for producing an aqueous dispersion, the method comprising:
obtaining an aqueous titanium oxide dispersion containing titanium oxide particles, a dispersant, and water; and
obtaining titanium oxide composite particles by adding a polymerizable monomer and a polymerization initiator to the aqueous titanium oxide dispersion to polymerize the polymerizable monomer, wherein
the obtaining of the titanium oxide composite particles includes adding the polymerizable monomer at a mass ratio of 1/5 or more relative to a total amount of the titanium oxide particles at one time, and
the polymerizable monomer contains a polymerizable monomer A of which solubility in water is 0.5 g/100 ml or less at 23° C.

### Claim 2 (depends on 1)

The method for producing an aqueous dispersion according to claim 1, wherein
the titanium oxide composite particles are raspberry-like composite particles containing the titanium oxide particles and a resin covering surfaces of the titanium oxide particles.

### Claim 3 (depends on 2)

The method for producing an aqueous dispersion according to claim 2, wherein
the resin has a shape of resin particles.

### Claim 4 (depends on 1)

The method for producing an aqueous dispersion according to claim 1, wherein
the amount of the polymerizable monomer A relative to a total amount of the polymerizable monomer is 30% by mass or more.

### Claim 5 (depends on 1)

The method for producing an aqueous dispersion according to claim 1, wherein
the titanium oxide particles contain titanium oxide particles of which surfaces are treated with at least alumina.

### Claim 6 (depends on 1)

The method for producing an aqueous dispersion according to claim 1, wherein
the dispersant contains a dispersant having an acidic group.

### Claim 7 (depends on 1)

The method for producing an aqueous dispersion according to claim 1, wherein
the polymerization initiator contains a polymerization initiator having a zwitterionic structure.

### Claim 8

An aqueous dispersion comprising:
raspberry-like titanium oxide composite particles containing titanium oxide particles and a resin covering surfaces of the titanium oxide particles; and
water.

### Claim 9 (depends on 8)

The aqueous dispersion according to claim 8, wherein
the resin has a shape of resin particles.

### Claim 10

An aqueous ink comprising:
raspberry-like titanium oxide composite particles containing titanium oxide particles and a resin covering surfaces of the titanium oxide particles; and
water.

### Claim 11 (depends on 10)

The aqueous ink according to claim 10, wherein
the resin has a shape of resin particles.