| 摘要 |
It has been found that high quality relief printing plates can be made using a photosensitive composition comprising at least one unsaturated polyester, at least one ethylenically unsaturated, addition polymerizable monomer, at least one photosensitive initiator and a poly(hydroxyl ether) derived from a diphenol and an epihalohydrin, such as bisphenol A-epichlorohydrin resin. The poly(hydroxyl ether) increases the viscosity of the photosensitive resin such that the resin is less likely to flow during platemaking process, thereby avoiding undesirable blemishes on the finished plate. |
