A photoinitiator according to Formula: wherein, R1 is selected from the group consisting of an alkyl group, an aryl group, a heteroaryl group, an alkenyl group, an alkynyl group, an alkaryl group, an aralkyl group, R5-O-, R6-S- and a photoinitiating moiety selected from the group consisting of a thioxanthone group, a benzophenone group, an α-hydroxyketone group, an α-aminoketone group, an acylphosphine oxide group and a phenyl glyoxalic acid ester group; R2 is selected from the group consisting of hydrogen, an alkyl group, an aryl group, a heteroaryl group, an alkenyl group, an alkynyl group, an alkaryl group and an aralkyl group; R3 is selected from the group consisting of -C(=O)-O-R7, -C(=O)-NR8-R9, C(=O)-R7, hydrogen, an alkyl group, an aryl group, heteroaryl group, an alkenyl group, an alkynyl group, an alkaryl group, an aralkyl group, and a photoinitiating moiety selected from the group consisting of a thioxanthone group, a benzophenone group, an α-aminoketone group, an acylphosphine oxide group and a phenyl glyoxalic acid ester group; R4 is selected from the group consisting of -C(=O)-O-R10, -C(=O)-NR11-R12, C(=O)-R10, a nitrile group, an aryl group, a heteroaryl group, and a photoinitiating moiety selected from the group consisting of a thioxanthone group, a benzophenone group, an α-aminoketone group, an acylphosphine oxide group and a phenyl glyoxalic acid ester group; and R5 and R6 are independently selected from the group consisting of an alkyl group, an aryl or heteroaryl group, an alkenyl group, an alkynyl group, an alkaryl group, an aralkyl group and a photoinitiating moiety selected from the group consisting of a thioxanthone group, a benzophenone group, an α-hydroxyketone group, an α-aminoketone group, an acylphosphine oxide group and a phenyl glyoxalic acid ester group; R7 to R10 are independently selected from the group consisting of hydrogen, an alkyl group, an aryl or heteroaryl group, an alkenyl group, an alkynyl group, an alkaryl group, an aralkyl group and a photoinitiating moiety selected from the group consisting of a thioxanthone group, a benzophenone group, an α-hydroxyketone group, an α-aminoketone group, an acylphosphine oxide group and a phenyl glyoxalic acid ester group, or R8 and R9 and/or R11 and R12 may represent the necessary atoms to form a five or six membered ring; with the proviso that at least one of R1, R3 and R4 is functionalized with the photoinitiating moiety; or wherein photoinitiator is a compound according to Formula: wherein R22 represents an alkyl group having no more than 6 carbon atoms and R23 represents a photoinitiating moiety selected from the group consisting of an acylphosphine oxide group, a thioxanthone group, a benzophenone group, an α-hydroxy ketone group and an α-amino ketone group; or wherein the photoinitiator is selected from group consisting of: and R1 is selected from the group consisting of an alkyl group, an aryl group, a heteroaryl group, an alkenyl group, an alkynyl group, an alkaryl group, an aralkyl group, R5-O-, R6-S- and a photoinitiating moiety selected from the group consisting of a thioxanthone group, a benzophenone group, an α-hydroxyketone group, an α-aminoketone group, an acylphosphine oxide group and a phenyl glyoxalic acid ester group; R2 is selected from the group consisting of hydrogen, an alkyl group, an aryl group, a heteroaryl group, an alkenyl group, an alkynyl group, an alkaryl group and an aralkyl group; R3 is selected from the group consisting of -C(=O)-O-R7, -C(=O)-NR8-R9, C(=O)-R7, hydrogen, an alkyl group, an aryl group, heteroaryl group, an alkenyl group, an alkynyl group, an alkaryl group, an aralkyl group, and a photoinitiating moiety selected from the group consisting of a thioxanthone group, a benzophenone group, an α-aminoketone group, an acylphosphine oxide group and a phenyl glyoxalic acid ester group; R4 is selected from the group consisting of -C(=O)-O-R10, -C(=O)-NR11-R12, C(=O)-R10, a nitrile group, an aryl group, a heteroaryl group, and a photoinitiating moiety selected from the group consisting of a thioxanthone group, a benzophenone group, an α-aminoketone group, an acylphosphine oxide group and a phenyl glyoxalic acid ester group; and R5 and R6 are independently selected from the group consisting of an alkyl group, an aryl or heteroaryl group, an alkenyl group, an alkynyl group, an alkaryl group, an aralkyl group and a photoinitiating moiety selected from the group consisting of a thioxanthone group, a benzophenone group, an α-hydroxyketone group, an α-aminoketone group, an acylphosphine oxide group and a phenyl glyoxalic acid ester group; R7 to R10 are independently selected from the group consisting of hydrogen, an alkyl group, an aryl or heteroaryl group, an alkenyl group, an alkynyl group, an alkaryl group, an aralkyl group and a photoinitiating moiety selected from the group consisting of a thioxanthone group, a benzophenone group, an α-hydroxyketone group, an α-aminoketone group, an acylphosphine oxide group and a phenyl glyoxalic acid ester group, or R8 and R9 and/or R11 and R12 may represent the necessary atoms to form a five or six membered ring; with the proviso that at least one of R1, R3 and R4 is functionalized with the photoinitiating moiety; or wherein photoinitiator is a compound according to Formula: wherein R22 represents an alkyl group having no more than 6 carbon atoms and R23 represents a photoinitiating moiety selected from the group consisting of an acylphosphine oxide group, a thioxanthone group, a benzophenone group, an α-hydroxy ketone group and an α-amino ketone group; or wherein the photoinitiator is selected from group consisting of: and