METHOD FOR PREPARING A PRINTING FORM FROM A PHOTOPOLYMERIZABLE ELEMENT

摘要

The invention provides a method for preparing a printing form from a photopolymerizable element. The photopolymerizable element includes a layer of a photopolymerizable composition containing an elastomeric block copolymer of polystyrene and polybutadiene having less than 15% by weight of 1,2-coupled bond segments in the polybutadiene block, an ethylenically unsaturated compound, and a photoinitiator. The method includes imagewise exposing the photopolymerizable element to actinic radiation in the presence of atmospheric oxygen; heating the element to a temperature sufficient to cause a portion of the layer to liquefy; and contacting an exterior surface of the photopolymerizable element with a development medium to allow at least a portion of the liquefied layer to be removed by the development medium.