Water-based ink for inkjet and method for producing printed matter

Patent metadata

Field	Value
Publication number	US-11613665-B2
Application number	US-201816614475-A
Country	US
Kind code	B2
Filing date	Apr 17, 2018
Priority date	May 30, 2017
Publication date	Mar 28, 2023
Grant date	Mar 28, 2023

Abstract

One embodiment relates to a water-based ink for an inkjet containing a pigment, a fixing resin, an organic solvent and water, wherein the fixing resin includes an A-B block polymer having an A block and a B block, the A block contains a structural unit (P-1) having an anionic functional group, and the acid value of the A-B block polymer is from 5 to 80 mgKOH/g.

First claim

The invention claimed is:

1. A water-based ink for an inkjet comprising a pigment, a fixing resin, an organic solvent and water, wherein
the fixing resin comprises an A-B block polymer having an A block and a B block,
the A block contains a structural unit (P-1) having an anionic functional group,
the A block and the B block are each, independently, a block containing one type of polymer selected from among a styrene-based polymer, a (meth)acrylic-based polymer and a styrene-(meth)acrylic-based polymer,
an amount of structural units contained in the A block is 5 to 25 mol % of a total molar amount of structural units contained in the A-B block polymer,
an amount of the structural unit (P-1) having an anionic functional group contained in the A block is at least 85 mol % of a total molar amount of the structural unit (P-1) having an anionic functional group contained in the A-B block polymer,
the acid value of the A-B block polymer is from 5 to 80 mgKOH/g, and
a glass transition temperature (TgB) of the B block is from 70 to 100° C.

2. The water-based ink for an inkjet according to claim 1 , wherein an amount of the structural unit (P-1) having an anionic functional group contained in the A block is from 40 to 80% by weight of all the structural units contained in the A block.

3. The water-based ink for an inkjet according to claim 1 , wherein the B block contains a structural unit (P-2) having an alkyl group of 8 to 30 carbon atoms and/or a structural unit (P-3) having an aromatic ring.

4. The water-based ink for an inkjet according to claim 3 , wherein the B block contains a structural unit having an alkyl group of 10 to 30 carbon atoms as the structural unit (P-2) having an alkyl group of 8 to 30 carbon atoms.

5. The water-based ink for an inkjet according to claim 3 , wherein the B block contains a styrene-based structure as the structural unit (P-3) having an aromatic ring.

6. The water-based ink for an inkjet according to claim 1 , wherein the organic solvent comprises a glycol ether and/or a 1,2-alkanediol of 3 or more carbon atoms.

7. The water-based ink for an inkjet according to claim 1 , further comprising a surfactant, wherein the surfactant comprises a siloxane-based surfactant.

8. A method for producing printed matter that comprises printing the water-based ink for an inkjet according to claim 1 onto a substrate.

9. Printed matter produced using the method for producing printed matter according to claim 8 .

Assignees

• Toyo Ink Sc Holdings Co Ltd
• Toyocolor Co Ltd

Inventors

• Utsugi Masayoshi
• Yoda Atsushi
• Sugihara Masahiro
• Jonai Kazuhiro
• Suzuki Norio

Classifications

• C08K3/04

  Carbon · CPC title

• C09D11/107

  from unsaturated acids or derivatives thereof · CPC title

• C08K5/0041

  Optical brightening agents, organic pigments · CPC title

• B41J2/01

  Ink jet · CPC title

• C08K3/013

  Fillers, pigments or reinforcing additives · CPC title