Ink-jet printing ink comprising N-vinyloxazolidinone

1. A process, comprising applying a printing ink to a substrate and exposing the printing ink to an energy to form a coated substrate, wherein the printing ink comprises a radiation curable composition comprising an N-vinyloxazolidinone of formula (I):

in which R 1 to R 4 independently from each other are a hydrogen atom or an organic radical having not more than 10 carbon atoms.

2. The process of claim 1 , wherein at least two of R 1 to R 4 are a hydrogen atom and any remaining R 1 to R 4 are an organic radical having not more than 10 carbon atoms.

3. The process of claim 1 , wherein:

all of R 1 to R 4 are hydrogens,

R 1 is a C1 to C4 alkyl group, and R 2 to R 4 are hydrogens, or

R 1 and R 2 are hydrogens, and R 3 and R 4 are independently a C1 to C4 alkyl group.

4. The process of claim 1 , wherein the radiation curable composition comprises the N-vinyloxazolidinone in an amount of from 0.5 to 80% by weight.

5. The process of claim 1 , wherein the radiation curable composition further comprises a (meth)acryloyl compound comprising at least one (meth)acryloyl group.

6. The process of claim 5 , wherein the radiation curable composition comprises at least one (meth)acryloyl compound having two to five (meth)acryloyl groups.

7. The process of claim 5 , wherein at least 70% by weight of all radiation curable compounds of the radiation curable composition are (meth)acryloyl compounds and the N-vinyloxazolidinone.

8. The process of claim 1 , wherein the radiation curable composition comprises less than 10% by weight of ater or organic solvents.

9. The process of claim 1 , wherein the radiation curable composition comprises at least one photoinitiator.

10. The process of claim 1 , wherein the process is an ink jet printing process.

11. The process of claim 10 , wherein the radiation curable composition is printed on a substrate and subsequently cured by radiation.

12. The process of claim 10 , wherein the substrate is a polypropylene substrate.