Radiation curable compositions for food applications

A liquid radiation curable composition comprising:

• a photoinitiating system consisting of:
• one or more photoinitiators selected from the group consisting of non-polymeric di- or multifunctional initiators, oligomeric or polymeric initiators, and polymerizable initiators;
• and
• one or more polymerizable co-initiators;
• wherein
• at least one of the polymerizable co-initiators is a co-initiator according to Formula (I):
• wherein,
• R1 and R2 are independently selected from the group consisting of an alkyl group, an alkenyl group, an alkynyl group, an aralkyl group, an alkaryl group, an aryl group, and a heteroaryl group;
• R3 to R6 are independently selected from the group consisting of hydrogen, an alkyl group, an alkenyl group, an alkynyl group, an acyl group, a thioalkyl group, an alkoxy group, a halogen, an aralkyl group, an alkaryl group, an aryl group, and a heteroaryl group;
• R7 is selected from the group consisting of hydrogen, an aldehyde group, a ketone group, an ester group, an amide group, an acyl group, a thioalkyl group, an alkoxy group, a halogen, a nitrile group, a sulphonate group, a sulphonamide group, an alkyl group, an alkenyl group, an alkynyl group, an aralkyl group, an alkaryl group, an aryl group, and a heteroaryl group;
• R1 and R2, R1 and R3, R2 and R5, R3 and R4, R4 and R7, R5 and R6, and R6 and R7 may represent the necessary atoms to form a 5 to 8 membered ring;
• and with the proviso that the aromatic amine has at least one alfa hydrogen;
• and
• at least one of R1 to R7 includes a polymerizable ethylenically unsatured functional group selected from the group consisting of acrylate, substituted acrylate, methacrylate, styrene, acrylamide, methacrylamide, allyl ester, allyl ether, vinyl ester, vinyl ether, fumarate, maleate, maleimide, and vinyl nitrile.