# US 2019/0169454 A1 · Photocurable clear ink composition for inkjet printing

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- Number: US 2019/0169454 A1
- Document ID: US20190169454A1
- Status: Published application
- Kind: A1
- Application number: 16/319,787
- Filed: 2017-06-30
- Published: 2019-06-06
- Earliest claimed: 2016-08-09
- Assignees: Sakata Inx Corporation
- Applicants: Sakata Inx Corporation
- Inventors: Okinori NAKASHIMA; Takuya MYOSE; Takuya OKAMOTO; Kazuhiro FUKE; Ryoichi NITTA
- Web page: https://patentgrep.com/patent/US20190169454A1

## CPC

- C09D 11/101: Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing
- C09D 11/38: characterised by non-macromolecular additives other than solvents, pigments or dyes
- B41M 5/00: Duplicating or marking methods; Sheet materials for use therein (by using light-sensitive materials G03; electrography, magnetography G03G {; repeatedly usable boards or tablets for writing or drawing B43L1/00})
- C08F 220/58: containing oxygen in addition to the carbonamido oxygen {, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine}
- C08F 224/00: Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a heterocyclic ring containing oxygen (cyclic esters of polyfunctional acids C08F218/00; cyclic anhydrides of unsaturated acids C08F220/00, C08F222/00)
- C08K 3/22: of metals
- C08K 3/36: Silica
- C08K 5/101: of monocarboxylic acids
- C09D 11/102: containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds
- C09D 11/103: of aldehydes, e.g. phenol-formaldehyde resins
- C09D 11/32: characterised by colouring agents
- C09D 11/322: Pigment inks
- C09D 11/36: based on non-aqueous solvents
- C08K 2003/2227: {of aluminium}
- 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)
- B41M: PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING, (correction of typographical errors B41J; processes for applying transfer pictures or the like B44C1/16; fluid media for correction of typographical errors by coating C09D10/00; printing textiles D06P)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

Clear inks are prone to heat-induced micro-gelling that can cause their storage stability to drop, and micro-gelling may also occur in clear inks with the passage of time, in which case their inkjet discharge property may drop. As a solution, a photocurable clear ink composition for inkjet printing is provided, which contains a photopolymerizable compound, a photopolymerization initiator, and an inorganic filler of 1 to 200 nm in average grain size accounting for 0.05 to 5.0 percent by mass in the composition, and whose visible light transmission factor is 30% or higher.

## Claims

### Claim 1

A photocurable clear ink composition for inkjet printing which contains a photopolymerizable compound, a photopolymerization initiator, and an inorganic filler of 1 to 200 nm in average grain size accounting for 0.05 to 5.0 percent by mass in the composition, and whose visible light transmission factor is 30% or higher.

### Claim 2 (depends on 1)

The photocurable clear ink composition for inkjet printing according to claim 1, wherein the inorganic filler is silica and/or aluminum oxide.

### Claim 3 (depends on 1)

The photocurable clear ink composition for inkjet printing according to claim 1, wherein an amino and/or acid group-containing pigment dispersant is contained.

### Claim 4 (depends on 1)

The photocurable clear ink composition for inkjet printing according to claim 1, wherein an amide group-containing monofunctional monomer and benzyl acrylate are contained, as the photopolymerizable compound, by 50 to 75 percent by mass in total quantity in the photocurable clear ink composition for inkjet printing.

### Claim 5 (depends on 1)

The photocurable clear ink composition for inkjet printing according to claim 1, wherein the amide group-containing monofunctional monomer is N-vinyl caprolactam and/or acryloyl morpholine.

### Claim 6 (depends on 1)

The photocurable clear ink composition for inkjet printing according to claim 1, wherein a viscosity at 25° C. is 10 mPa·s or lower.

### Claim 7 (depends on 2)

The photocurable clear ink composition for inkjet printing according to claim 2, wherein an amino and/or acid group-containing pigment dispersant is contained.

### Claim 8 (depends on 2)

The photocurable clear ink composition for inkjet printing according to claim 2, wherein an amide group-containing monofunctional monomer and benzyl acrylate are contained, as the photopolymerizable compound, by 50 to 75 percent by mass in total quantity in the photocurable clear ink composition for inkjet printing.

### Claim 9 (depends on 2)

The photocurable clear ink composition for inkjet printing according to claim 2, wherein the amide group-containing monofunctional monomer is N-vinyl caprolactam and/or acryloyl morpholine.

### Claim 10 (depends on 2)

The photocurable clear ink composition for inkjet printing according to claim 2, wherein a viscosity at 25° C. is 10 mPa·s or lower.

### Claim 11 (depends on 3)

The photocurable clear ink composition for inkjet printing according to claim 3, wherein an amide group-containing monofunctional monomer and benzyl acrylate are contained, as the photopolymerizable compound, by 50 to 75 percent by mass in total quantity in the photocurable clear ink composition for inkjet printing.

### Claim 12 (depends on 3)

The photocurable clear ink composition for inkjet printing according to claim 3, wherein the amide group-containing monofunctional monomer is N-vinyl caprolactam and/or acryloyl morpholine.

### Claim 13 (depends on 3)

The photocurable clear ink composition for inkjet printing according to claim 3, wherein a viscosity at 25° C. is 10 mPa·s or lower.

### Claim 14 (depends on 4)

The photocurable clear ink composition for inkjet printing according to claim 4, wherein the amide group-containing monofunctional monomer is N-vinyl caprolactam and/or acryloyl morpholine.

### Claim 15 (depends on 4)

The photocurable clear ink composition for inkjet printing according to claim 4, wherein a viscosity at 25° C. is 10 mPa·s or lower.

### Claim 16 (depends on 5)

The photocurable clear ink composition for inkjet printing according to claim 5, wherein a viscosity at 25° C. is 10 mPa·s or lower.

### Claim 17 (depends on 7)

The photocurable clear ink composition for inkjet printing according to claim 7, wherein an amide group-containing monofunctional monomer and benzyl acrylate are contained, as the photopolymerizable compound, by 50 to 75 percent by mass in total quantity in the photocurable clear ink composition for inkjet printing.

### Claim 18 (depends on 7)

The photocurable clear ink composition for inkjet printing according to claim 7, wherein the amide group-containing monofunctional monomer is N-vinyl caprolactam and/or acryloyl morpholine.

### Claim 19 (depends on 8)

The photocurable clear ink composition for inkjet printing according to claim 8, wherein the amide group-containing monofunctional monomer is N-vinyl caprolactam and/or acryloyl morpholine.

### Claim 20 (depends on 11)

The photocurable clear ink composition for inkjet printing according to claim 11, wherein the amide group-containing monofunctional monomer is N-vinyl caprolactam and/or acryloyl morpholine.