| 摘要 |
A method for preparing a negative-working lithographic printing plate is provided which comprises the steps of (i) providing a lithographic printing plate precursor comprising (a) a grained and anodized aluminum support which has been subjected to a post-anodic treatment with a hydrophilising agent which is a polymer containing acrylic acid monomeric units, and (b) on said support a coating comprising hydrophobic thermoplastic polymer particles and an infrared light absorbing agent, (ii) exposing said coating to heat, thereby inducing coalescence of said thermoplastic polymer particles at exposed areas of said coating, and (iii) developing said precursor by applying a gum solution to said coating, thereby removing non-exposed areas of said coating from said support. According to the above method the printing plates exhibit an improved stability of the clean-out and the background stain after ageing. |
