Inkjet ink composition and printed matters created using inkjet ink composition

• US 20060025497A1
• Filed: 03/08/2005
• Published: 02/02/2006
• Est. Priority Date: 07/29/2004
• Status: Active Grant

• Current Assignee: Toshiba Tec Corporation (Toshiba Corporation)
• Original Assignee: Toshiba Tec Corporation (Toshiba Corporation)
• Inventors: Ushirogouchi, Toru, Hiroki, Masashi, Akiyama, Ryozo, Ohtsu, Kazuhiko, Ishibashi, Mitsuru
• Granted Patent: US 7,579,390 B2
• Time in Patent Office: Days
• US Class Current: 523/160
• 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

Abstract

There is proposed an inkjet ink composition comprising a pigment component to which a resin having a basic terminal is adsorbed, a photo-acid generating agent containing an onium salt, and at least one kind of solvent which can be polymerized under the presence of an acid. The content of multivalent salt included in the onium salt is not more than 20% by weight based on a total weight of onium salt, and the content of the pigment component is confined within the range of 3 to 41% by weight based on the ink composition.

Claims

1. An inkjet ink composition comprising:

a pigment component having a resin comprising a basic terminal adsorbed thereto, the pigment component having an average particle diameter of 200 nm or less;

a photo-acid generating agent containing an onium salt; and

at least one kind of solvent which can be polymerized under the presence of an acid;

wherein the content of multivalent salt included in the onium salt is not more than 20% by weight based on a total weight of onium salt; and

wherein the content of the pigment component is confined within the range of 3 to 41% by weight based on the ink composition.

2. The inkjet ink composition according to claim 1, wherein the resin having a basic terminal is selected from the group consisting of vinyl polymer or copolymer, acrylic polymer or copolymer, polyester, polyamide, polyimide, polyurethane, amino-based polymer, silicon-containing polymer, sulfur-containing polymer, fluorine-containing polymer and epoxy resin.

3. The inkjet ink composition according to claim 1, wherein the onium salt is consisting only of monovalent salt.

4. The inkjet ink composition according to claim 1, wherein the onium salt is arylsulfonium fluorophosphate.

5. The inkjet ink composition according to claim 1, wherein the resin having a basic terminal has a basicity (pKb) of not more than 4.

6. The inkjet ink composition according to claim 1, wherein the onium salt includes a compound represented by the following general formula (1) or (2):

7. The inkjet ink composition according to claim 1, wherein said R₁, R₂ and R₃ is selected from the group consisting of alkyl group having 4 to 20 carbon atoms, alkyloxy group having 4 to 20 carbon atoms, and a substituent group having 4 to 20 carbon atoms and a polyethylene oxide skeleton into which ethylene glycol is dehydrocondensed.

8. The inkjet ink composition according to claim 1, wherein said R₄ in the general formula is selected from the groups consisting of a group having phenylene;

a group having a phenylene sulfide skeleton;

a group having a thiophene skeleton; and

a group having a furan skeleton.

9. The inkjet ink composition according to claim 1, wherein the photo-acid generating agent is incorporated at a ratio ranging from 2 to 4% by weight based on the entire weight of the solvent, and which further comprises a sensitizing agent.

10. The inkjet ink composition according to claim 1, wherein the pigment is a magenta pigment having a quinacridone skeleton.

11. The inkjet ink composition according to claim 1, wherein the solvent which can be polymerized under the presence of an acid is selected from at least one selected from the group consisting of limonene dioxide, neopentylglycol diglycidyl ether, bivalent oxetane compounds having an aliphatic skeleton, and bivalent vinyl ether compounds having an alicyclic skeleton.

12. The inkjet ink composition according to claim 1, wherein the compound to be incorporated as the solvent comprises an aliphatic skeleton or an alicyclic skeleton each containing therein oxygen atom.

13. A printed matter comprising a cured substance of said inkjet ink composition as claimed in claim 1.