Abstract: The invention relates to a polymer (P) comprising at least one photoinitiator moiety (PI) and at least one dye moiety (DYE), wherein said at least one photoinitiator moiety (PI) and at least one dye moiety (DYE) are covalently linked to said polymer (P). Additionally, the invention relates to said polymer (P) being end-functionalized with optionally substituted acryloyi groups. The fact that both of these moieties are tightly bonded within the polymer, and the cross-linked polymer, means that the opportunities for leaching/migration of these components is reduced or even eliminated. Inks comprising at least one of said polymers are also provided. Methods for the manufacture of the polymers, and for printing are provided.

Abstract: A process for photopolymerizing a photopolymerizable compound having at least one ethylenically unsaturated double bond, comprises contacting said photopolymerizable compound with a photoactive oxide and irradiating it, wherein the photoactive oxide includes one or more moieties together with a moiety wherein there are at least 2 atoms between moiety I and moiety II in the additive and where X represents an oxygen or sulphur atom. Novel compounds which exhibit beneficial effects on cure in the presence of oxygen, which may be especially advantageous when LEDs are used, are also described.

Abstract: A process for photopolymerising a photopolymerisable compound having at least one ethylenically unsaturated double bond, comprises contacting said photopolymerisable compound with a photoactive oxide and irradiating it, wherein the photoactive oxide includes one or more moieties together with a moiety wherein there are at least 2 atoms between moiety I and moiety II in the additive and where X represents an oxygen or sulphur atom. Novel compounds which exhibit beneficial effects on cure in the presence of oxygen, which may be especially advantageous when LEDs are used, are also described.

Abstract: An improved process for the production of alkyl or substituted alkyl p-dimethylamino benzoates by the reductive alkylation of alkyl or substituted alkyl p-aminobenzoates using hydrogen in the presence of raney nickel.