Printing ink

1. An inkjet ink comprising 7 to 30% by weight of organic solvent, based on the total weight of the ink, a radiation curable monofunctional monomer, a radiation curable multifunctional monomer, a photoinitiator and a dispersible pigment, wherein the ink has a viscosity of 7 mPas or less at 25° C., wherein the organic solvent is selected from glycol ethers, glycol ether esters, alcohols, ketones, organic carbonates and mixtures thereof.

2. The ink according to claim 1 wherein the organic solvent has a boiling point of greater than 100° C.

3. The ink according to claim 1 wherein the organic solvent is present in an amount of 7 to 25% by weight based on the total weight of the ink.

4. The ink according to claim 1 comprising less than 5% by weight of water, preferably less than 2% by weight of water and more preferably less than 1% by weight of water, based on the total weight of the ink.

5. The ink according to claim 1 wherein the radiation curable monofunctional monomer is present in an amount of 20 to 80% by weight, preferably 30 to 70%, based on the total weight of the ink.

6. The ink according to claim 1 wherein the radiation curable multifunctional monomer is present in an amount of 5 to 60% by weight, preferably 10 to 50% by weight, more preferably 20 to 40%, based on the total weight of the ink.

7. The ink according to claim 1 wherein the radiation curable monomers have a molecular weight of 450 or less.

8. The ink according to claim 1 that is substantially free of radiation curable material that has a molecular weight of greater than 450.

9. The ink according to claim 1 that is substantially free of resin binder.

10. The ink according to claim 1 wherein the radiation curable monomers are capable of polymerising by radical polymerisation.

11. The ink according to claim 10 wherein the radiation curable monofunctional monomer is selected from monofunctional (meth)acrylates, N-vinyl amides, N-acryloylamines, α,β-unsaturated ethers and mixtures thereof.