Printing form precursor having elastomeric cap layer and a method of preparing a printing form from the precursor

摘要

The invention pertains to a printing form precursor, a method of preparing a printing form from the precursor, and a process of preparing the precursor. The printing form precursor includes a photopolymerizable layer, an elastomeric layer having at least an elastomeric binder and particulate, and an actinic radiation opaque material on, adjacent, or disposed above the elastomeric layer opposite the photopolymerizable layer. The particulate is selected from specific material particles having an average diameter from 1 to 10 micron and a refractive index that is within 0.04 units of an index of refraction of the composition forming the elastomeric layer.

主权项

1. A printing form precursor comprising:
a) a layer of a photopolymerizable composition sensitive to actinic radiation, the composition comprising a binder, a monomer, and a photo initiator; b) a layer of an elastomeric composition, that is or becomes sensitive to the actinic radiation, comprising at least an elastomeric binder, and particulate, the elastomeric composition having an index of refraction; wherein the particulate is selected from polyamide, polymethylmethacrylate, feldspar, nepheline syenite, or glass particles, the particulate having an average diameter from 1 to 10 micron and an index of refraction that is ±0.04 of the index of refraction of the elastomeric composition; and c) an actinic radiation opaque layer on, adjacent, or disposed above the elastomeric layer b) opposite the photopolymerizable layer a), that is capable of forming an in-situ mask.