Polyurethane resin for ink jet ink

Patent metadata

Field	Value
Publication number	US-10982035-B2
Application number	US-201716343806-A
Country	US
Kind code	B2
Filing date	Oct 12, 2017
Priority date	Oct 28, 2016
Publication date	Apr 20, 2021
Grant date	Apr 20, 2021

Abstract

A polyurethane resin having an anionic group and a polyalkylene oxide in a side chain thereof is obtainable by reacting a polyester polyol, a polyether diol, a polyol containing an anionic group, and a polyisocyanate, and the polyester polyol is obtained by reacting an aromatic polycarboxylic acid and a polyol. The polyurethane resin can be used as binder in an ink jet ink and provides excellent scratch and solvent resistance of printed images.

First claim

The invention claimed is:

1. An ink jet ink comprising:
water;
a water-soluble organic solvent; and
a polyurethane resin comprising an anionic group and a polyalkylene oxide in a side chain, the polyurethane resin obtained by the process of:
reacting a polyester polyol, a polyether diol, a polyol including an anionic group, a diol with a molecular weight equal to or less than 400 g/mol, and a polyisocyanate at a corrected polyol ratio higher than 0.2, wherein the corrected polyol ratio is ((the molecular weight of the diol with the molecular weight equal to or less than 400 g/mol)×(a weight ratio of the polyester polyol to the molecular weight of the diol with the molecular weight equal to or less than 400 g/mol))/(a number average molecular weight of the polyester polyol); wherein
the polyester polyol is obtained by reacting an aromatic polycarboxylic acid and a polyol.

2. The ink jet ink of claim 1 , wherein the aromatic polycarboxylic acid is selected from the group consisting of phthalic acid, terephthalic acid, and isophthalic acid.

3. The ink jet ink of claim 1 , wherein the aromatic polycarboxylic acid includes a mixture of a terephthalic acid and an isophthalic acid.

4. The ink jet ink of claim 1 , wherein the polyether diol includes a compound according to Formula 1:

wherein
R1 is methyl or ethyl;
R2 is H or C 1 -C 4 alkyl; and
n represents an integer from 5 to 50.

5. The ink jet ink of claim 3 , wherein the polyether diol is a compound according to Formula 1:

wherein
R1 is methyl or ethyl;
R2 is H or C 1 -C 4 alkyl; and
n represents an integer from 5 to 50.

6. The ink jet ink of claim 3 , wherein the polyether diol includes α-[2,2-bis(hydroxymethyl)butyl]-ω-methoxy-poly(oxy-1,2-ethanediyl).

7. The ink jet ink of claim 1 , wherein an amount of the polyether diol is equal to or less than 30 wt. % and more than 1 wt. % with respect to a total wt. % of the polyurethane resin.

8. The ink jet ink of claim 1 , wherein an amount of the anionic group is equal to or less than 2.0 wt. % and more than 0.03 wt. % with respect to a total wt. % of the polyurethane resin.

9. The ink jet ink of claim 1 , wherein the anionic group includes a carboxylate anion and/or carboxylic acid.

10. The ink jet ink of claim 3 , wherein the anionic group includes a carboxylate anion and/or carboxylic acid.

11. The ink jet ink according to claim 1 , further comprising a colorant.

12. The ink jet ink according to claim 3 , further comprising a colorant.

13. The ink jet ink according to claim 5 , further comprising a colorant.

14. An inkjet recording method comprising:
providing a substrate;
jetting on the substrate the ink jet ink according to claim 1 ;
heating the substrate to a temperature equal to 80° C. or less before and/or during the step of jetting; and
heating or drying the ink jet ink jetted on the substrate.

Assignees

• Agfa Nv

Inventors

• Van Aert Hubertus
• Bertels Ellen
• Loccufier Johan

Classifications

• C08G18/4018

  Mixtures of compounds of group C08G18/42 with compounds of group C08G18/48 · CPC title

• C09D11/00 Primary

  Inks · CPC title

• C09D11/10

  based on artificial resins · CPC title

• C09D11/30

  Inkjet printing inks · CPC title

• C08G18/4862

  containing at least a part of the ether groups in a side chain · CPC title