INK COMPOSITION, PROCESS FOR PRODUCING SAME, AND INK-JET INK SET AND INK-JET PRINTING SYSTEM BOTH INCLUDING SAID INK COMPOSITION

• US 20190315986A1
• Filed: 05/30/2019
• Published: 10/17/2019
• Est. Priority Date: 09/14/2015
• Status: Active Grant

• Current Assignee: Maxell, Ltd.
• Original Assignee: Maxell Holdings, Ltd. (Maxell, Ltd.)
• Inventors: NISHIMOTO, Tomohisa, NISHIMURA, Yoshiro, NAKAYAMA, Masaru, KUBO, Satoshi
• Granted Patent: US 10,822,509 B2
• Time in Patent Office: Days
• CPC Class Codes: B41J 2/17 characterised by ink handling cleaning by driving a fluid through the nozzles to the outside thereof B41J2/1652; for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing B41J11/0015
• CPC Class Codes: B41J 2/2107 characterised by the ink properties supplying ink in a solid state B41J2/17593
• CPC Class Codes: 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
• CPC Class Codes: C09D 11/30 Inkjet printing inks
• CPC Class Codes: C09D 11/322 Pigment inks
• CPC Class Codes: C09D 11/36 based on non-aqueous solvents
• CPC Class Codes: C09D 11/38 characterised by non-macromolecular additives other than solvents, pigments or dyes
• CPC Class Codes: C09D 11/40 Ink-sets specially adapted for multi-colour inkjet printing

Abstract

An ink composition according to the present invention contains a polymerizable compound and a photopolymerization initiator, wherein an amount of organic sulfonic acid measured at a temperature of 25° C. by using a water extraction method is 50 ppm or less, and an amount of water measured by a Karl Fischer method is 0.50 mass % or less with respect to a total mass of the ink composition. Also, an ink-jet ink set according to the present invention includes the above-described ink composition of the present invention. Also, an ink-jet printing system according to the present invention uses the above-described ink composition of the present invention and an ink-jet recording apparatus, and the ink-jet recording apparatus includes an ink heating portion and an ink filter.

Claims

1. A process for producing an ink composition, the process comprising the steps of

preparing an ink composition precursor containing a polymerizable compound and a photopolymerization initiator;

adding an alkali metal salt to the ink composition precursor and stirring the ink composition precursor at a temperature of 40°

C. or more and 70°

C. or less for a period of 10 minutes or more and 120 minutes or less;

holding and aging the stirred ink composition precursor at a temperature of −

20°

C. or more and 35°

C. or less; and

filtrating the aged ink composition precursor to produce an ink composition.

3. The process for producing an ink composition according to claim 1, further comprising a dewatering step.

4. The process for producing an ink composition according to claim 1, wherein the polymerizable compound contains an amine-modified polymerizable compound.

5. The process for producing an ink composition according to claim 1,

wherein the ink composition precursor further contains a coloring agent.

2. A process for producing an ink composition, the process comprising the steps of

preparing an ink composition precursor containing a polymerizable compound and a photopolymerization initiator;

stirring the ink composition precursor at a temperature of 40°

C. or more and 70°

C. or less for a period of 10 minutes or more and 120 minutes or less;

holding and aging the stirred ink composition precursor at a temperature of −

20°

C. or more and 35°

C. or less; and

filtrating the aged ink composition precursor to produce an ink composition,

wherein at least one of the polymerizable compound and the photopolymerization initiator contains alkali metal ions.

6. The process for producing an ink composition according to claim 2, further comprising a dewatering step.

7. The process for producing an ink composition according to claim 2,

wherein the polymerizable compound contains an amine-modified polymerizable compound.

8. The process for producing an ink composition according to claim 2,

wherein the ink composition precursor further contains a coloring agent.