| 摘要 |
The use of a pigment as an organic liquid resistance additive in a positive working composition provided as a solid coating on a substrate, for example a printing plate precursor, provides the coating with improved resistance to degradation by certain organic liquids including petroleum ethers, glycols and alkanols. Suitable compositions include those having the property that when provided as a coating on a substrate, regions which have been heated imagewise selectively dissolve in an aqueous developer, leaving behind regions which have not been heated. Infra-red laser radiation may be used to deliver the heat imagewise. |
