Photoinitiator composition

Patent metadata

Field	Value
Publication number	US-9321853-B2
Application number	US-201013394700-A
Country	US
Kind code	B2
Filing date	Sep 1, 2010
Priority date	Sep 8, 2009
Publication date	Apr 26, 2016
Grant date	Apr 26, 2016

Abstract

A photoinitiator composition comprising a combination of aminoalkyl phenone, thioxanthone and multifunctional amino benzoate synergist for use in printing inks and coatings that are curable using UV radiation, particularly from LED lamps.

First claim

The invention claimed is:

1. A photoinitiator system comprising an aminoalkyl phenone, a thioxanthone and a multifunctional amino benzoate synergist, wherein a weight ratio of the thioxanthone to the aminoalkyl phenone is greater than 1:1.

2. The photoinitiator system of claim 1 , wherein the multifunctional amino benzoate synergist comprises two or more diC 1-4 alkylamino benzoate groups.

3. The photoinitiator system of claim 2 , wherein the multifunctional amino benzoate synergist comprises two or more para-(N,N′-dimethylamino) benzoate groups.

4. The photoinitiator system of claim 1 wherein the weight ratio of the thioxanthone to the aminoalkyl phenone ranges from 2:1 to 7:1.

5. A UV-curable ink or coating comprising a photoinitiator system, said photoinitiator comprises an aminoalkyl phenone, a thioxanthone and a multifunctional amino benzoate synergist, wherein a weight ratio of the thioxanthone to the aminoalkyl phenone is greater than 1:1; and wherein the thioxanthone and the aminoalkyl phenone together constitute from 5 wt % to 15 wt % of the total weight of the UV-curable ink or coating.

6. The UV-curable ink or coating of claim 5 , further comprising a colorant.

7. The UV-curable ink or coating of claim 1 , wherein the multifunctional amino benzoate synergist constitutes from 1 wt % to 8 wt % of the total weight of the UV-curable ink or coating.

8. The UV-curable ink or coating of claim 5 , further comprising an ethylenically unsaturated monomer.

9. The UV-curable ink or coating of claim 5 , wherein the weight ratio of the thioxanthone to the aminoalkyl phenone ranges from 2:1 to 7:1.

10. A process for preparing a printed or coated article comprising:
applying a UV-curable ink or coating to said article, said ink or coating having a photoinitiator system comprising an aminoalkyl phenone, a thioxanthone and a multifunctional amino benzoate synergist, wherein a weight ratio of the thioxanthone to the aminoalkyl phenone is greater than 1:1; and
curing the UV-curable ink or coating composition using UV radiation.

11. The process of claim 10 , wherein the UV-curable ink or coating is applied by a lithographic or flexographic printing technique.

12. The process of claim 10 , wherein the UV radiation is applied from an LED light source.

13. A printed or coated article comprising a cured image or layer of the UV-curable ink or coating of claim 5 .

14. The UV-curable ink or coating of claim 5 , wherein the multifunctional amino benzoate synergist comprises two or more diC 1-4 alkylamino benzoate groups.

15. The UV-curable ink or coating of claim 14 , wherein the multifunctional amino benzoate synergist comprises two or more para-(N,N′-dimethylamino) benzoate groups.

Assignees

• Herlihy Shaun Lawrence
• Sun Chemical Corp

Inventors

• Herlihy Shaun Lawrence

Classifications

• C09D11/101

  Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing · CPC title

• C09D7/00

  Features of coating compositions, not provided for in group C09D5/00 (driers C09F9/00); Processes for incorporating ingredients in coating compositions · CPC title

• Y10T428/24802

  Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] · CPC title

• C08F2/50 Primary

  with sensitising agents · CPC title

• C09D11/03

  characterised by features other than the chemical nature of the binder · CPC title