# US 10,865,321 B2 · Oil-based inkjet ink

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- Number: US 10,865,321 B2
- Document ID: US10865321B2
- Status: Granted
- Kind: B2
- Application number: 15/904,504
- 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: Kazuyuki Ando; Shinichiro Shimura; Marie Morinaga; Hikaru Sugiura
- Web page: https://patentgrep.com/patent/US10865321B2

## CPC

- C09D 11/36: based on non-aqueous solvents
- C09D 11/033: characterised by the solvent
- C09D 11/037: characterised by the pigment
- C09D 11/102: containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds
- C09D 11/322: Pigment inks
- C09D 11/324: containing carbon black
- 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 is disclosed, the oil-based inkjet ink containing a pigment, a pigment dispersant and a non-aqueous solvent, wherein the pigment contains an acidic carbon black having a pH of 2 to 6, the non-aqueous solvent contains a modified silicone oil having a surface tension of not more than 27 mN/m, and an amount of the modified silicone oil, relative to a total mass of the oil-based inkjet ink, is at least 15% by mass but not more than 80% by mass.

## Claims

### Claim 1

An oil-based inkjet ink comprising a pigment, a pigment dispersant and a non-aqueous solvent, wherein
the pigment comprises an acidic carbon black having a pH of 2 to 6,
the non-aqueous solvent contains a modified silicone oil having a surface tension of not more than 27 mN/m at 23° C., and
an amount of the modified silicone oil, relative to a total mass of the oil-based inkjet ink, is at least 15% by mass but not more than 80% by mass.

### Claim 2 (depends on 1)

The oil-based inkjet ink according to claim 1, wherein the amount of the modified silicone oil, relative to the total mass of the oil-based inkjet ink, is at least 15% by mass but not more than 70% by mass.

### Claim 3 (depends on 1)

The oil-based inkjet ink according to claim 1, wherein the modified silicone oil has a surface tension of not more than 26 mN/m at 23° C.

### Claim 4 (depends on 1)

The oil-based inkjet ink according to claim 1, wherein the amount of the modified silicone oil, relative to the total mass of the non-aqueous solvent, is at least 20% by mass.