Patent ID: 6720130
Filing Date: 2004-04-13
Classification: B41C,G03F,Y10S

Abstract:
A negative-working radiation imageable lithographic printing plate precursor comprising a substrate having thereon:(a) an oleophilic base layer comprising an oleophilic polymer containing functional reactive groups, and a photothermal converter material, and (b) a hydrophilic overlayer comprising a crosslinked hydrophilic polymer capable of absorbing aqueous lithographic fountain solution, in which said crosslinked hydrophilic polymer is interlayer chemically bonded with the functional reactive groups of said oleophilic polymer in the base layer to form an interlayer adhesive bond between said layers, exposure of said printing plate precursor to laser radiation resulting in non-ablative weakening of said interlayer adhesive bond between said layers whereby said hydrophilic overlayer can be removed by fountain solution or ink on a lithographic printing press to reveal the oleophilic base layer.