| 摘要 |
<p>An alkaline liquid developer suitable for development of an infrared radiation-presensitized plate for use in making a lithographic printing plate, which developer comprises at least one selected from the group consisting of the compound represented by the following formula (I), the compound represented by the following formula (II), acetylene alcohols and acetylene glycols.
wherein R represents an aromatic group or an aliphatic group having carbon atoms of from 6 to 20, and n represents an integer of 4 or more.
wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 and R 8 may be the same or different, and each independently represents H or -CH 3 , and R 9 , R 10 , R 11 and R 12 may be the same or different, and each independently represents H, -CH 3 , -COR 13 or -CONHR 14 (wherein each of R 13 and R 14 represents an alkyl, aryl, alkenyl or alkynyl group), a represents an integer of from 2 to 12, b, c, d, e, f, g, h and i may be the same or different, and each independently represents 0 or an integer of from 1 to 300, and (b+f)(c+g)(d+h)(e+i)‰ 0. A method for preparing a lithographic printing plate comprising the steps of imagewise light-exposing to infrared radiation, a presensitized plate for use in making a lithographic printing plate, said presensitized plate having an image-forming layer which comprises an IR-absorbing agent, and developing the light-exposed plate with the above alkaline liquide developer. The present invention provides an alkaline developer and a method for preparing a lithographic printing plate which are capable of forming a highly sharp and clear image in the plate without damages to the image areas, inhibiting occurrence of insoluble matter originated from an IR-absorbing agent and the like, as well as adherence of the insoluble matter to the surface of a plate during processing, and processing a lithographic printing plate precursor stably in extended periods of time.</p> |
