| 摘要 |
A radiation-curable ink comprises of a compound having one ethylenically unsaturated group, such as (meth) acrylamide, (2(2-ethoxyethoxy ethyl acrylate), (2-phenoxy ethyl acrylate), cyclic trimethylolpropane formal acrylate, caprolactone acrylate, dicyclopentadienyl methacrylate or isobornyl acrylate; a compound having more than one ethylenically unsaturated group, such as ethylene glycol di(meth)acrylate, dicyclopentenyl di(meth)acrylate, triethylene glycol diacrylate, tetraethylene glycol di(meth)acrylate, pentaerythritol tetracrylate, trimethylolpropane trimethacrylate or tetramethylolmethane tetramethacrylate; an optionally substituted thiochroman-4-one; and a colourant; wherein all parts are by weight and the weight ratio of (a):(b) is >1.4:1. The inks are particularly suitable for ink jet printing flexible substrates. The inks can be cured rapidly using a low irradiation dose and provide prints having a low degree of post-cure colour shift.
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