A radiation curable composition comprising a novel photoreactive polymer is disclosed comprising a dendritic polymer core with at least one initiating functional group and at least one co-initiating functional group.Suitable radiation curable compositions are varnishes, lacquers, printing inks and radiation curable ink-jet inks. The dendritic polymeric core is preferably a hyperbranched polymer.

 
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> Polyepoxide, (cyclo)aliphatic polyamine and solid polyisocyanate

> Anionic copolymers prepared in an inverse emulsion matrix
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