Formaldehyde-free inkjet compositions and processes

Patent metadata

Field	Value
Publication number	US-9616683-B2
Application number	US-201414554287-A
Country	US
Kind code	B2
Filing date	Nov 26, 2014
Priority date	Aug 10, 2010
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

Disclosed are a process for inkjet printing color images on various substrates using a formaldehyde-free crosslinking agent in the ink composition, which is therefore devoid of formaldehyde emission and suitable for health-aware manufacturing practices, as well as objects having images and designs printed thereon which are devoid of formaldehyde and therefore suitable for use by infants.

First claim

What is claimed is:

1. An inkjet composition comprising a crosslinking agent, a property-sensitive agent, a co-polymerizable agent, a colorant and a second carrier, said property-sensitive agent is sensitive to a change in a chemical and/or physical property, such that upon effecting said change on a surface of an object the inkjet composition congeals on said surface to thereby form an image on said object, wherein said crosslinking agent is a formaldehyde-free crosslinking agent and said image is substantially devoid of formaldehyde emission, said formaldehyde-free crosslinking agent is a heteroaryl polycarbamate.

2. The composition of claim 1 , being substantially devoid of formaldehyde emission.

3. The composition of claim 1 , wherein a formaldehyde level emitted thereby is equal or less than 20 ppm, subsequent to printing and curing said image.

4. The composition of claim 1 , wherein said object is a garment.

5. The composition of claim 1 , wherein said object is intended for use by infants.

6. The composition of claim 1 , wherein said heteroaryl polycarbamate is a tris(alkoxycarbonylamino) triazine.

7. The composition of claim 1 , wherein said property is acidity and said change is effected by an acid.

8. The composition of claim 7 , wherein said acid is a transitory acid.

9. The composition of claim 8 , wherein said transitory acid is a volatile acid and/or an intra/cross-reactive acid.

10. The composition of claim 9 , wherein said transitory acid is selected from the group consisting of an α-hydroxy acid, glycolic acid, lactic acid, carbonic acid, formic acid, acetic acid, propionic acid and butanoic acid.

11. The composition of claim 1 , forming a part of a multi-part ink composition.

12. The composition of claim 11 , wherein said multi-part ink composition further comprises an immobilization composition.

13. The composition of claim 12 , wherein said multi-part ink composition further comprises a third part which comprises said emulsified property-sensitive agent, a dispersed metal oxide, a third carrier, said co-polymerizable agent and said formaldehyde-free crosslinking agent, whereas said third part congeals when converging with said immobilization composition on said surface.

14. The composition of claim 13 , wherein said third carrier is an aqueous carrier.

15. The composition of claim 13 , wherein said metal oxide is substantially opaque white and selected from the group consisting of titanium dioxide, lead oxide, zinc oxide and molybdenum oxide.

16. The composition of claim 1 , wherein said ink composition further comprises a co-polymerizable binder, a polymerization catalyst, a buffering agent, a softener/plasticizer, a surface active agent, a surface tension modifying agent, a viscosity modifying agent, a thickener agent, an anticorrosion agent and any combination thereof.

17. The composition of claim 1 , wherein said second carrier is an aqueous carrier.

18. The composition of claim 1 , wherein said immobilization further comprises a first carrier, said first carrier is an aqueous carrier.

19. An object having an image printed thereon, the image is printed by the composition of claim 1 .

20. The object of claim 19 , wherein a formaldehyde level exhibited thereby is equal or less than 20 ppm.

Assignees

• Kornit Digital Ltd

Inventors

• Mozel Jacob
• Mann Jacob

Classifications

• D06P5/002

  Locally enhancing dye affinity of a textile material by chemical means · CPC title

• B41M5/0023 Primary

  Digital printing methods characterised by the inks used (inks per se C09D11/00) · CPC title

• B41M5/0011

  Pre-treatment or treatment during printing of the recording material, e.g. heating, irradiating (after-treatment of prints B41M7/00; printers for treating or overcoating copy materials before, during or after printing B41J11/0015) · CPC title

• D06P1/6493

  Carbodiimides (=N=C=N=) · CPC title

• B41J3/4078

  Printing on textile · CPC title