Polyurethanes

• US 20080103251A1
• Filed: 08/15/2005
• Published: 05/01/2008
• Est. Priority Date: 09/10/2004
• Status: Abandoned Application

• Current Assignee: FUJIFILM Imaging Colorants Limited (Fujifilm Holdings Corporation)
• Original Assignee: FUJIFILM Imaging Colorants Limited (Fujifilm Holdings Corporation)
• Inventors: Walker, Mark, O' Donnell, John Patrick, Yeates, Stephen George
• Application Number:
  US11/661,547
• Publication Number:
  US 20080103251A1
• Time in Patent Office: Days
• US Class Current: 524/590
• CPC Class Codes: C08G 18/0823 containing carboxylate salt groups or groups forming them
• CPC Class Codes: C08G 18/12 using two or more compounds having active hydrogen in the first polymerisation step
• CPC Class Codes: C08G 18/283 Compounds containing ether groups, e.g. oxyalkylated monohydroxy compounds
• CPC Class Codes: C08G 18/3228 acyclic
• CPC Class Codes: C08G 18/3231 Hydrazine or derivatives thereof
• CPC Class Codes: C08G 18/6692 with compounds of group C08G18/34
• CPC Class Codes: C09D 11/30 Inkjet printing inks
• CPC Class Codes: C09D 11/322 Pigment inks

Abstract

A process for the preparation of a water-dissipatable polyurethane comprising preparation of a polyurethane prepolymer, reacting the polyurethane prepolymer with a mono functional end-capping agent to give a partially end capped polyurethane prepolymer and chain extending the partially end capped polyurethane prepolymer to give the water-dissipatable polyurethane. The polyurethanes are useful in ink jet printing.

Claims

1-20. -20. (canceled)

21. An ink comprising 0.1 wt % to 10 wt % of a polyurethane obtained by a process comprising the preparation of a water-dissipatable polyurethane comprising preparation of a polyurethane prepolymer, reacting the polyurethane prepolymer with a mono functional end-capping agent to give a partially end capped polyurethane prepolymer and chain extending the partially end capped polyurethane prepolymer to give the water-dissipatable polyurethane.

22. An ink according to claim 21 which has a viscosity at 25°

C. of less than 50 cP

23. An ink according to claim 21 for ink jet printing which contains water and organic solvent and has a viscosity at 25°

C. of less than 50 cP.

24. An ink according to claim 21 wherein the partially end capped polyurethane prepolymer is prepared by reacting polyurethane prepolymer having isocyanate end groups with a mono alcohol.

25. An ink according to claim 21 wherein the water-dissipatable polyurethane contains from 10 to 40% by weight of poly(alkylene oxide) groups.

26. An ink according to claim 21 which further comprises a pigment.

27. An ink according to any one claims 21 to 26 which is suitable for use in ink jet printing.

28. A process for the preparation of a polyurethane comprising the preparation of a polyurethane prepolymer, reacting a polyurethane prepolymer having isocyanate end groups with a mono functional end-capping agent which is a mono alcohol to give a partially end capped polyurethane prepolymer and chain extending the partially end capped polyurethane prepolymer to give the water-dissipatable polyurethane.

29. A process according to claim 28 wherein the water-dissipatable polyurethane contains from 10 to 40% by weight of poly(alkylene oxide) groups.

30. A process according to claim 28 wherein the water-dissipatable polyurethane has an acid value>

20 mg KOH/g and <

100 mg KOH/g.

31. A process according to claim 28 wherein the mono alcohol is a C_1-6-mono alcohol or a C_1-6-alkyl ether of a glycol.

32. A process according to claim 28 wherein the water-dissipatable polyurethane contains from 10 to 40% by weight of poly(alkylene oxide) groups.

33. A process according to claim 28 wherein:

(a) the chain extension is performed using a C_2-4-alkylene diamine;

(b) the end capping is performed in tetramethyl sulpholane using a polyalkylene glycol mono C_1-4-alkyl ether having a molecular weight below 300;

(c) the polyol is a polypropylene glycol having an Mn of 500 to 3000;

(d) the polyisocyanate is isophorone diisocyanate; and

(e) the water-dissipatable polymer has an Mn below 10,000, an acid value>

20 mg KOH/g and <

100 mg KOH/g and a log P of −

0.5 to +2.0.

34. A water-dissipatable polyurethane obtained by a process according to any one of claims 28-33.