摘要:
An electrostatic master having improved water, cockle and pick resistance for lithographic printing, and method for making the same, comprising a base, a barrier coat applied to said base, and a photoconductive layer containing a photoconductive material and binder applied to said barrier coat. The barrier coat preferably comprises a copolymer of at least 60 % ethylenically unsaturated polymerizable monomer having non-polar functionality and about 3 to about 40 % of a polymerizable olefinically unsaturated monomer having polar functionality. The barrier coat preferably contains about 2.5 to about 50 % plastic particles based on the weight of the barrier coat. The barrier coat achieves improved water resistance at low coat weights, and thus can be applied without substantial change in conductivity.
摘要:
The present invention resides broadly in a method for the preparation of substrates having improved water and/or solvent resistance which comprises applying to a substrate a plastic particle containing formulation, and then wetting the formed coating with a solventto which the plastic particles are sensitive. The present invention is particularly applicable to the preparation of electrostatic masters of improved water resistance for lithographic printing having a photoconductive layer and a barrier coat to which the photoconductive layer is applied. The barrier coat contains a binding amount of a binder and filler at least a portion of which is an amount of said plastic particles sensitive to the solvent system of the photoconductive layer, the amount of plastic particles and sensitivity being sufficient to materially increase water resistance.