Sun Chemical Corporation

Brian Rowatt

Shaun Lawrence Herlihy

Robert Stephen Davidson

Derek Ronald Illsley

Stephen Anthony Hall

Jason Wilber

Timothy Bowles

Robert Lambie Rooney

Clifford John Coles

The invention describes the use of a water-based UV curable inkjet printing ink wherein the ink is basic due to the presence of a tertiary amine, allowing the complete dissolution of an acid functional photoinitiator of Formula I or Formula IA (wherein R, R, R, n, q, and y are as defined herein). This combination of photoinitiator and tertiary amine allows the rapid low dosage UV curing of a water-based UV formulation using a UV LED light source. 

Water-based UV inkjet ink

The acrylate monomers of the present invention, particularly o-phenyl phenoxyethyl acrylate, provide very fast curing, hard and solvent resistant digital printing inks, and yet are also still surprisingly flexible. These properties make for a technically superior alternative to the widely accepted very hard monomer isobornyl acrylate. O-phenyl phenoxyethylacrylate also has the additional benefit of being free from the strong odor associated with isobornyl acrylate.

Digital printing inks

Cyclic carbamate functional compounds, which are the reaction product of a cyclic carbamate having an acrylate functional group, such as N-(2-acryloyloxyethyl)oxazolidinone, with aliphatic amine compounds, said cyclic carbamate functional compounds being useful as oxygen scavengers in energy-curable compositions, such as inks, coatings and adhesives, that comprise (a) the cyclic carbamate functional compound, (b) reactive monomers and/or oligomers and, optionally, (c) a photoinitiator.

Cyclic carbamate compounds useful in energy-curable compositions

A series of novel ketocoumarin photoinitiators are disclosed for use in radiation curing.

Ketocoumarins as photoinitiators and photosensitizers in printing inks and coatings

Compounds of formula (I) [in which: A and B are terminal groups; Rrepresents a group of formula (II) or (III); Ris alkyl or aryl; Z is a group &#x2014;(CHR), where Ris hydrogen, hydroxy or alkyl, and n is a number from 0 to 6; Y is carbonyl or a group &#x2014;CH&#x2014;; Q represents a residue of a dihydroxy compound; and x is a number from 1 to 100] are useful sensitisers for use with Type II photoinitiators in the formulation of printing inks and other energy curable coatings. 

Piperazino sensitisers

Multifunctional cationic photoinitiators, their preparation and use

Compounds of formula (I): [where: the substituents Rare individually selected from C-Calkyl groups and optionally substituted benzyl groups; the substituents Rare individually selected from alkyl groups or, together with the nitrogen atom to which they are attached, represent a nitrogen-containing heterocyclic group; Z is selected from C-Carylene groups and groups of formula &#x2014;(CHR)&#x2014;, where Ris hydrogen, hydroxy or a C-Calkyl group, and n is 0 to 6; Y is carbonyl or &#x2014;CH2&#x2014;; Q is a residue of a mono- or poly-hydroxy compound; and x is 1 to 6; and esters thereof] are useful as multi-functional photoinitiators for use in coating compositions to be cured by radiant energy. 

Piperazino based photoinitiators

Compounds of formula (I): [where: Ris a direct bond, oxygen, a group &#x3e;CH, sulphur, a group &#x3e;C&#x2550;O, a group-(CH)&#x2014; or a group-N&#x2014;R, where Ris hydrogen or alkyl; R, R, Rand Rare hydrogen or substituents&#x3b1;; R, R, Rand Rare hydrogen, hydroxy or alkyl; or Rand Rare joined to form a fused ring system with the benzene rings to which they are attached; Ris a direct bond, oxygen or a &#x2014;CH-group; p is 0 or 1 ; substituents&#x3b1; are: alkyl, alkoxy, alkenyl, halogen, nitrile, hydroxyl, aryl, aralkyl, aryloxy, aralkyloxy, arylalkenyl, cycloalkyl, carboxy, carboxyalkoxy, alkoxycarbonyl, aryloxycarbonyl, alkylcarbonyloxy, alkanesulphonyl, arenesulphonyl, alkanoyl or arylcarbonyl; n is 1 to 12; Ris hydrogen, methyl or ethyl; A is a group &#x2014;[O(CHRCHR)]&#x2014;, &#x2014;[O(CH)CO]-, or &#x2014;[O(CH)CO]()-[O(CHRCHR)]&#x2014;, where: one of Rand Ris hydrogen and the other is hydrogen, methyl or ethyl; a is 1 to 2 ; b is 4 to 5 ; Q is a residue of a polyhydroxy compound having from 2 to 6 hydroxy groups; x is a number greater than 1 but no greater than the number of available hydroxyl groups in Q; y is a number from 1 to 10; and Xis an anion]; and esters thereof are useful as cationic photoinitiators, especially for use in surface coating applications, such as printing inks and varnishes, and which are intended to be cured by polymerisation initiated by radiation.

Compounds of formula (I): [in which: Rrepresents a direct bond, an oxygen atom, a group &#x3e;CH, a sulphur atom, a group &#x3e;C&#x2550;O, a group &#x2014;(CH)&#x2014; or a group of formula &#x2014;N&#x2014;R, where Ris hydrogen or an alkyl; R, R, Rand Rare each hydrogen or various groups or atoms; R, R, Rand Rare each hydrogen, hydroxy, or alkyl; or Rand Rform a fused ring system with the benzene rings to which they are attached; Ris a direct bond, oxygen atom or methylene; and Xis an anion; and esters thereof] are useful as cationic photoinitiators, especially for use in surface coating applications, such as printing inks and varnishes, and which are intended to be cured by polymerisation initiated by radiation.

Fused ring compounds, and their use as cationic photoinitiators

A method of preparing a polymeric aryl sulfonamide is described which consists of reacting aryl sulfonyl with a polymeric amine in the presence of an acid acceptor. Also, another method of preparing a polymeric aryl sulfonamide is disclosed and consists of: reacting an aryl sulfonyl with a polymeric diamine in the presence of an acid acceptor to result in a linear oligomeric molecule; and reacting the linear oligomeric molecule with a monoamine or an aryl monosulfonyl in the presence of an acid acceptor. The use of polymeric aryl sulfonamides as pigment dipersants and wetting agents is also disclosed.

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Maidstone, United Kingdom

Brian Rowatt