Compounds of the formula (I) (I), wherein X is O, S, a direct bond or CR.sub.16R.sub.17; Y is O or S; R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7 and R.sub.8 for example are hydrogen, halogen, C.sub.1-C.sub.4alkyl, or a group of formula (II) or (III) (II) (III) provided that either (i) one of R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7 or R.sub.8 is a group of formula (II) or (III); or (ii) one of R.sub.1, R.sub.2, R.sub.3 Or R.sub.4 is a group of formula (II) or (III) and one of R.sub.5, R.sub.6, R.sub.7 or R.sub.8 is a group of formula (II) or (III); R.sub.9 and R.sub.10 independently of each other are C.sub.1-C.sub.4alkyl or together with the C atom to which they are attached form a 5-membered, 6-membered or 7-membered carbocyclic ring; R.sub.11 is hydrogen, C.sub.1-C.sub.4alkyl, C.sub.5-C.sub.7cycloalkyl, 2-tetrahydropyranyl or Si(C.sub.1-C.sub.4alkyl).sub.3; R.sub.12 and R.sub.13 for example are C.sub.1-C.sub.4alkyl, C.sub.2-C.sub.2alkenyl, phenyl-C.sub.1-C.sub.4alkyl, phenyl-C.sub.1-C.sub.4alkyl which is substituted by C.sub.1-C.sub.4alkyl, R.sub.14 and R.sub.15 independently of each other are C.sub.1-C.sub.4alkyl, C.sub.5-C.sub.7cycloalkyl, or together with the N atom to which they are attached form a 5-membered, 6-membered or 7-membered ring, which may contain additional heteroatoms O, S or N; R.sub.16 and R.sub.17 for example are hydrogen, C.sub.1-C.sub.5alkyl, C.sub.5-C.sub.7cycloalkyl, phenyl-C.sub.1-C.sub.4alkyl, phenyl; are effective photoinitiators.

##STR00001##

Compounds of the formula (I) (I), wherein X is O, S, a direct bond or CR.sub.16R.sub.17; Y is O or S; R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7 and R.sub.8 for example are hydrogen, halogen, C.sub.1-C.sub.4alkyl, or a group of formula (II) or (III) (II) (III) provided that either (i) one of R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7 or R.sub.8 is a group of formula (II) or (III); or (ii) one of R.sub.1, R.sub.2, R.sub.3 Or R.sub.4 is a group of formula (II) or (III) and one of R.sub.5, R.sub.6, R.sub.7 or R.sub.8 is a group of formula (II) or (III); R.sub.9 and R.sub.10 independently of each other are C.sub.1-C.sub.4alkyl or together with the C atom to which they are attached form a 5-membered, 6-membered or 7-membered carbocyclic ring; R.sub.11 is hydrogen, C.sub.1-C.sub.4alkyl, C.sub.5-C.sub.7cycloalkyl, 2-tetrahydropyranyl or Si(C.sub.1-C.sub.4alkyl).sub.3; R.sub.12 and R.sub.13 for example are C.sub.1-C.sub.4alkyl, C.sub.2-C.sub.2alkenyl, phenyl-C.sub.1-C.sub.4alkyl, phenyl-C.sub.1-C.sub.4alkyl which is substituted by C.sub.1-C.sub.4alkyl, R.sub.14 and R.sub.15 independently of each other are C.sub.1-C.sub.4alkyl, C.sub.5-C.sub.7cycloalkyl, or together with the N atom to which they are attached form a 5-membered, 6-membered or 7-membered ring, which may contain additional heteroatoms O, S or N; R.sub.16 and R.sub.17 for example are hydrogen, C.sub.1-C.sub.5alkyl, C.sub.5-C.sub.7cycloalkyl, phenyl-C.sub.1-C.sub.4alkyl, phenyl; are effective photoinitiators.

##STR00001##

A radiation-curable ink jet composition contains monomer A represented by formula (1), a mono-, bi-, or trifunctional urethane (meth)acrylate oligomer, and an N-vinyl compound:

CH.sub.2═CR.sup.1—COOR.sup.2—O—CH═CH—R.sup.3  (1) where R.sup.1 denotes —H or —CH.sub.3, R.sup.2 denotes an organic residue having 2 to 20 carbon atoms, and R.sup.3 denotes a hydrogen atom or an organic residue having 1 to 11 carbon atoms.

A radiation-curable ink jet composition contains monomer A represented by formula (1), a mono-, bi-, or trifunctional urethane (meth)acrylate oligomer, and an N-vinyl compound:

CH.sub.2═CR.sup.1—COOR.sup.2—O—CH═CH—R.sup.3  (1) where R.sup.1 denotes —H or —CH.sub.3, R.sup.2 denotes an organic residue having 2 to 20 carbon atoms, and R.sup.3 denotes a hydrogen atom or an organic residue having 1 to 11 carbon atoms.

A three-dimension forming support material for ink jet includes a warm water-soluble radiation curable compound that exhibits solubility in warm water of at least 40° C. to 90° C. after the compound is cured; and at least one polyglycerin compound selected from the group consisting of fatty acid esters of polyglycerin, ethylene oxide adducts of polyglycerin, and propylene oxide adducts of polyglycerin.

A photocurable ink composition includes polymerizable compounds and a photopolymerization initiator. The polymerizable compounds include vinyl ether group-containing (meth)acrylic esters represented by the following Formula (I):
CH.sub.2═CR.sup.1—COOR.sup.2—O—CH═CH—R.sup.3  (I)
(wherein, R.sup.1 represents a hydrogen atom or a methyl group; R.sup.2 represents a divalent organic residue having 2 to 20 carbon atoms; and R.sup.3 represents a hydrogen atom or a monovalent organic residue having 1 to 11 carbon atoms), dipropylene glycol di(meth)acrylate, and monofunctional (meth)acrylate having an aromatic ring skeleton. The ink composition includes a coloring material.

A photocurable ink composition includes polymerizable compounds and a photopolymerization initiator. The polymerizable compounds include vinyl ether group-containing (meth)acrylic esters represented by the following Formula (I):
CH.sub.2═CR.sup.1—COOR.sup.2—O—CH═CH—R.sup.3  (I)
(wherein, R.sup.1 represents a hydrogen atom or a methyl group; R.sup.2 represents a divalent organic residue having 2 to 20 carbon atoms; and R.sup.3 represents a hydrogen atom or a monovalent organic residue having 1 to 11 carbon atoms), dipropylene glycol di(meth)acrylate, and monofunctional (meth)acrylate having an aromatic ring skeleton. The ink composition includes a coloring material.

The present invention relates to the field of security inks suitable for printing security features on substrates, in particular on security documents or articles as well as security features made from said security inks, and security documents comprising a security feature made from said security inks. In particular, the invention provides UV-Vis radiation radically curable security inks comprising an ink vehicle and pigments comprising a flake-shaped non-metallic or metallic substrate comprising one or more at least partial coating layers, an at least partial surface treatment layer made of one or more surface modifiers selected from fluoro compounds.

The present invention relates to the field of security inks suitable for printing security features on substrates, in particular on security documents or articles as well as security features made from said security inks, and security documents comprising a security feature made from said security inks. In particular, the invention provides UV-Vis radiation radically curable security inks comprising an ink vehicle and pigments comprising a flake-shaped non-metallic or metallic substrate comprising one or more at least partial coating layers, an at least partial surface treatment layer made of one or more surface modifiers selected from fluoro compounds.

The disclosure relates to ink compositions for digital printing on an external surface of a plastic article. The ink compositions comprise an ink removal-promoting additive. In some aspects, the ink removal-promoting additive can facilitate the separation or loosening of the image from the external surface of the article when the image is exposed to a liquid-based solution at an elevated temperature. Also disclosed are recyclable plastic articles having an external surface with an image printed thereon using the disclosed ink composition and methods for removing cured ink from a plastic container. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.