Strijckers, Hans Louis P

A UV curable composition containing a mixture of free radical polymerizable monomers and a APO photoinitiator according to formula (I): <img class="EMIRef" id="5f39f83d-299c-4f56-81e0-bb8b15c82811-ia01" /> wherein R1 is selected from the group consisting of an alkyl group, an alkenyl group, an alkynyl group, an aralkyl group, an alkaryl group and an aryl group or a heteroaryl group; R2 and R3 are independently selected from an alkyl group and an alkoxy group; R4 is selected from a hydrogen, an alkyl group and an alkoxy group; X and Y are independently selected from an oxygen atom, a methylene group, a - C(=CH2)- group, and a carbon atom present in a group selected from a straight chain alkylene group, an alkenylene group, an arylene group, a heteroarylene group and a cycloalkylene group; L represents a divalent linking group selected from the group consisting of an unsubstituted alkylene group, an arylene group, a heteroarylene group, a cycloalkylene group, a substituted alkylene group substituted by one or more ether groups, a substituted alkylene group substituted by one or more substituents selected from the group consisting of an aryl group, a heteroaryl group, an arylene group, a heteroarylene group, a cycloalkylene group, an ester group, an amide group, an amine group, an ether group, a thioether group, a ketone group, an aldehyde group, a sulfoxide group, a sulfone group, a sulfonate ester group, a sulphonamide group, -Cl, -Br, -I, -OH, - SH, -CN and -NO<2>; and wherein the UV curable composition is free of a photoinitiator including 2 monoacyl phosphine oxide moieties linked to each other via their acyl group and wherein the 2 monoacyl phosphine oxide moieties have a chemical structure differing in the phosphine oxide part. Cured products and inkjet printing methods with the radiation curable compositions are also disclosed.

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An ink set for manufacturing decorative laminates including pigmented free radical curable inkjet inks and a free radical curable liquid, wherein the pigmented free radical curable inkjet inks include a colour pigment and a polymerizable composition containing 10 to 90 wt% of one or more monofunctional polymerizable compounds; wherein the free radical curable liquid includes a polymerizable composition containing 15 wt% or more of polyfunctional polymerizable compounds and 15 wt% or more of a specific monofunctional polymerizable compound; and wherein all weight percentages wt% are based upon the total weight of the polymerizable composition in the pigmented free radical curable inkjet ink or the polymerizable composition in the free radical curable liquid;

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A photoinitiator including 2 to 6 monoacyl phosphine oxide moieties characterized in that the monoacyl phosphine oxide moieties are linked to each other via their acyl group and that at least 2 monoacyl phosphine oxide moieties have a chemical structure differing in the phosphine oxide part.

An acyl phosphine oxide photoinitiator having an ether group, a hydroxy group or a tertiary amine group connected via a carbon chain of 1 to 3 carbon atoms to an amide group on the acyl group of a monoacyl phosphine oxide moiety. The use of the acyl phosphine oxide photoinitiator in photocurable compositions and UV curable inkjet inks is also disclosed.