Claims
- 1. A radiation-curable composition for use as a primer base coat for electrostatic offset printing, the composition comprising:(i) an ethylenically unsaturated monomer, oligomer or polymer that is capable of being photopolymerized; (ii) a photoinitiator that is capable of initiating the polymerization of the ethylenically unsaturated monomer (i) when irradiated with ultraviolet light; and (iii) an inorganic transfer agent; and (iv) an adhesion promoter.
- 2. The radiation-curable composition of claim 1, wherein the monomer, oligomer or polymer is selected from the group consisting of esters of acrylic and methacrylic acid and N-vinylamide and mixtures thereof.
- 3. The radiation-curable composition of claim 2, wherein the ester is phenoxyethyl acrylate, hexanediol diacrylate, tri(propylene glycol) diacrylate, trimethylolpropane triacrylate, polyethylene glycol diacrylate, hydroxyethyl methacrylate, trimethylolpropane triacrylate, tetrahydrofurfuryl acrylate, lauryl acrylate, octyl acrylate decyl acrylate, acrylates of polyurethane, polyester, polyether, melamine or epoxy resins, ethoxylated or propoxylated derivatives of any of the aforementioned acylates or methacrylates or a mixture thereof.
- 4. The radiation-curable composition of claim 2 wherein the N-vinylamide is N-vinylcaprolactam or N-vinylformamide.
- 5. The radiation-curable composition of claim 1, wherein the monomer, oligomer or polymer is present in an amount from 10 to 80%, by weight of the composition.
- 6. The radiation-curable composition of claim 1, wherein the photoinitiator is benzophenone, 1-hydroxycyclohexyl phenyl ketone, 2-benzyl-2-dimethylamino-(4-morpholinophenyl)butan-1-one, benzil dimethylketal, isopropylthoxanthone, bis(2,6-dimethylbenzoyl)-2,4,4-trimethylpentyl-phosphine oxide or a mixture thereof.
- 7. The radiation-curable composition of claim 6, wherein the photoinitiator is colourless or substantially colourless.
- 8. The radiation-curable composition of claim 1, wherein the photoinitiator is present in an amount from 0.5 to 20%, by weight of the composition.
- 9. The radiation-curable composition of claim 1, wherein the inorganic transfer agent is a silica or modified silica.
- 10. The radiation-curable composition of claimed in claim 9, wherein the silica or modified silica is dispersed in the ethylenically unsaturated monomer.
- 11. The radiation-curable composition of claim 1, wherein the inorganic transfer agent is present in an amount from 0.5 to 50%, by weight of the composition.
- 12. The radiation-curable composition of claim 1, wherein the adhesion promoter is a polar organic nitrogen compound.
- 13. The radiation-curable composition of claim 12, wherein the adhesion promoter is a diamine, a triamine, or a mixture thereof.
- 14. The radiation-curable composition of claim 12, wherein the adhesion promoter is present in an amount from 5 to 25% by weight of the composition.
- 15. A method for printing a substrate comprising applying a primer base coat of the composition of claim 1 to the substrate before printing.
- 16. The method of claim 15, wherein the substrate is polycarbonate.
- 17. The method of claim 15 wherein the monomer, oligomer or polymer is selected from the group consisting of esters of acrylic and methacrylic acid and N-vinylamide and mixtures thereof.
- 18. The method of claim 15 wherein the ester is phenoxyethyl acrylate, hexanediol diacrylate, tri(propylene glycol) diacrylate, trimethylolpropane triacrylate, polyethylene glycol diacrylate, hydroxyethyl methacrylate, trimethylolpropane triacrylate, tetrahydrofurfuryl acrylate, lauryl acrylate, octyl acrylate decyl acrylate, acrylates of polyurethane, polyester, polyether, melamine or epoxy resins, ethoxylated or propoxylated derivatives of any of the aforementioned acylates or methacrylates or a mixture thereof.
- 19. The method of claim 15 wherein the N-vinylamide is N-vinylcaprolactam or N-vinylformamide.
- 20. The composition of claim 1 which further comprises a pigment.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9930041 |
Dec 1999 |
GB |
|
CROSS-REFERENCES TO RELATED APPLICATIONS
This application claims priority of Great Britain No. PCT/GB00/04798 filed Dec. 20, 1999, the complete disclosure of which is hereby incorporated by reference.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/GB00/04798 |
|
WO |
00 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO01/61416 |
8/23/2001 |
WO |
A |
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Number |
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Date |
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5242719 |
Medford et al. |
Sep 1993 |
A |
5635544 |
Tamura et al. |
Jun 1997 |
A |
6403673 |
Groves |
Jun 2002 |
B2 |
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Number |
Date |
Country |
0 475 592 |
Mar 1992 |
EP |
0 549 946 |
Jul 1993 |
EP |
WO 9849604 |
Nov 1998 |
WO |