# US 10,865,322 B2 · Oil-based inkjet ink

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- Number: US 10,865,322 B2
- Document ID: US10865322B2
- Status: Granted
- Kind: B2
- Application number: 15/904,508
- Filed: 2018-02-26
- Published: 2018-08-30
- Granted: 2020-12-15
- Earliest claimed: 2017-02-28
- Assignees: Riso Kagaku Corporation
- Applicants: Riso Kagaku Corporation
- Inventors: Hikaru Sugiura; Shinichiro Shimura; Marie Morinaga; Kazuyuki Ando
- Web page: https://patentgrep.com/patent/US10865322B2

## CPC

- C09D 11/36: based on non-aqueous solvents
- C09D 11/033: characterised by the solvent
- C09D 11/037: characterised by the pigment
- C09D 11/322: Pigment inks
- C09D 11/326: characterised by the pigment dispersant
- 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 oil-based inkjet ink can be provided which exhibits excellent discharge stability even after a long idle period, and also yields high image density and prevents show-through in printed items. The oil-based inkjet ink contains a pigment, an amide-based dispersant and a non-aqueous solvent, wherein the non-aqueous solvent contains a modified silicone oil having 2 or 3 silicon atoms in one molecule, and a petroleum-based hydrocarbon solvent.

## Claims

### Claim 1

An oil-based inkjet ink comprising a pigment, an amide-based dispersant and a nonaqueous solvent, wherein the non-aqueous solvent comprises a modified silicone oil having 2 or 3 silicon atoms in one molecule, and a petroleum-based hydrocarbon solvent.

### Claim 2 (depends on 1)

The oil-based inkjet ink according to claim 1, wherein a boiling point of the modified silicone oil is higher than 250° C., and an initial boiling point of the petroleum-based hydrocarbon solvent is 250° C. or lower.

### Claim 3 (depends on 1)

The oil-based inkjet ink according to claim 1, wherein an aniline point of the petroleum-based hydrocarbon solvent is 90° C. or lower.

### Claim 4 (depends on 1)

The oil-based inkjet ink according to claim 1, wherein the modified silicone oil contains a modified silicone oil having an organic group in which a carbon atom is bonded to a silicon atom and in which a total number of carbon atoms and oxygen atoms is at least 4.

### Claim 5 (depends on 1)

The oil-based inkjet ink according to a claim 1, wherein the modified silicone oil contains an alkyl-modified silicone oil.