Energy curable compositions including polyols, and any blend of ethylenically unsaturated monomers and oligomers. The polyols of the invention are essentially free of any ethylenically unsaturated groups. It is preferred that the polyol substances according to the invention have greater than one hydroxy group and preferably have boiling points in excess of 170° C. The compositions of the invention are particularly useful for the printing or coating of food packaging and may be applied via any printing or coating method, although inkjet printing is a preferred method.

A radiation-curable ink jet composition comprises a polymerizable compound component including a monofunctional monomer component and a multifunctional monomer component. The content of the monofunctional monomer component is 87 mass % or more based on the total amount of the polymerizable compound component, the monofunctional monomer component includes a monofunctional acrylate containing a polycyclic hydrocarbon group, and the weighted average of the glass transition temperatures of homopolymers of the respective polymerizable compounds is 42° C. or more when the mass ratios of the contents of the respective polymerizable compounds are weighted.

A radiation-curable ink jet composition comprises a polymerizable compound component including a monofunctional monomer component and a multifunctional monomer component. The content of the monofunctional monomer component is 87 mass % or more based on the total amount of the polymerizable compound component, the monofunctional monomer component includes a monofunctional acrylate containing a polycyclic hydrocarbon group, and the weighted average of the glass transition temperatures of homopolymers of the respective polymerizable compounds is 42° C. or more when the mass ratios of the contents of the respective polymerizable compounds are weighted.

A printable dielectric ink composition includes an inhibited catalyst-polymer complex and a crosslinker, wherein the printable dielectric ink composition has a viscosity of about 1 to about 10 cP.

A printable dielectric ink composition includes an inhibited catalyst-polymer complex and a crosslinker, wherein the printable dielectric ink composition has a viscosity of about 1 to about 10 cP.

Polymerizable liquids are described herein which, in some embodiments, can produce 3D printed articles of high resolution and desirable mechanical properties. In one aspect, a polymerizable liquid comprises an acrylate component, a polymeric additive, and a monomeric curing agent, wherein the acrylate component and monomeric curing agent are copolymerizable upon exposure to light. In being copolymerizable, the acrylate component and monomeric curing agent can form a copolymer. As described father herein, the monomeric curing agent can enable further reaction of the copolymer with one or more crosslinking species to link the copolymer with one more polymeric networks.

Polymerizable liquids are described herein which, in some embodiments, can produce 3D printed articles of high resolution and desirable mechanical properties. In one aspect, a polymerizable liquid comprises an acrylate component, a polymeric additive, and a monomeric curing agent, wherein the acrylate component and monomeric curing agent are copolymerizable upon exposure to light. In being copolymerizable, the acrylate component and monomeric curing agent can form a copolymer. As described father herein, the monomeric curing agent can enable further reaction of the copolymer with one or more crosslinking species to link the copolymer with one more polymeric networks.

A radiation-curable ink jet composition that is a white ink containing a white coloring material or a pale or clear ink containing 1.2% by mass or less of a coloring material contains at least one polymerizable compound including at least one of a monofunctional monomer having a nitrogen-containing heterocyclic structure and a monomer having a hydroxy group. In the composition, the thioxanthone-based photopolymerization initiator content is limited to 0.3% or less relative to the total mass of the radiation-curable ink jet composition.

A radiation-curable ink jet composition that is a white ink containing a white coloring material or a pale or clear ink containing 1.2% by mass or less of a coloring material contains at least one polymerizable compound including at least one of a monofunctional monomer having a nitrogen-containing heterocyclic structure and a monomer having a hydroxy group. In the composition, the thioxanthone-based photopolymerization initiator content is limited to 0.3% or less relative to the total mass of the radiation-curable ink jet composition.

The present invention relates to novel class of photoinitiators and their use in photopolymerization compositions. The invention also concerns a process for the photopolymerization of compositions comprising said photoinitiators.