Abstract: Radiation-curable compositions of Pigment Violet 23 are described which can be used advantageously in UV inks for inkjet printing machines. Soiling containing such UV inks, especially within inkjet printing machines, can be removed particularly easily in a contactless procedure with conventional cleaners. The radiation-curable compositions described contain at least one modified Pigment Violet 23 which carries at least one polar functional group of the formula (I): —X-E?? (I) where X is a bridging group and E is a polar molecule radical.

Abstract: Radiation-curable compositions of Pigment Violet 23 are described which can be used advantageously in UV inks for inkjet printing machines. Soiling containing such UV inks, especially within inkjet printing machines, can be removed particularly easily in a contactless procedure with conventional cleaners. The radiation-curable compositions described contain at least one modified Pigment Violet 23 which carries at least one polar functional group of the formula (I): —X-E?? (I) where X is a bridging group and E is a polar molecule radical.

Abstract: A poly-electrolyte composition for forming a water insoluble copolymer suitable as a hydrogel, wherein the copolymer is formed by means of free radical polymerization of at least a first and a second hydrophilic monomer, wherein the first monomer is selected from vinylic sulphonic acids, vinylic phosphonic acids or a water soluble salt thereof, and wherein the second monomer is a vinylic monomer with an electron-withdrawing spacer between the double bond and an acidic group, at least one compound selected from the group consisting of monomers comprising an acidic group either in the free acid form or in the form of a water soluble salt, and of which the logarithm of the acid dissociation constant (pKa) in the free acid form has a value smaller than 3.5.