A diazo based imaging element having increased sensitivity

摘要

The present invention provides an imaging element comprising on a hydrophilic surface of a support a light sensitive layer comprising a diazo resin characterized in that the light sensitive layer comprises at least one diazo resin being a condensation product of 4,4' bis methoxy methyl diphenyl ether with a diazonium salt of a p-aminodiphenylamine. The present invention also provides a method for making a lithographic printing plate comprising the steps of image-wise exposing an imaging element as defined above and subsequently developing a thus obtained image-wise exposed imaging element by means of rinsing or washing with an aqueous liquid.