(19)
(11) EP 1 690 685 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
28.03.2007 Bulletin 2007/13

(43) Date of publication A2:
16.08.2006 Bulletin 2006/33

(21) Application number: 06002128.4

(22) Date of filing: 02.02.2006
(51) International Patent Classification (IPC): 
B41C 1/10(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK YU

(30) Priority: 09.02.2005 JP 2005033310

(71) Applicant: FUJIFILM Corporation
Minato-ku Tokyo (JP)

(72) Inventors:
  • Hatanaka, Yusuke c/o Fuji Photo Film Co., Ltd.
    Haibara-gun Shizuoka-ken (JP)
  • Watanabe, Kotaro c/o Fuji Photo Film Co., Ltd.
    Haibara-gun Shizuoka-ken (JP)

(74) Representative: HOFFMANN EITLE 
Patent- und Rechtsanwälte Arabellastrasse 4
81925 München
81925 München (DE)

   


(54) Planographic printing plate precursor


(57) The planographic printing plate precursor according to the invention is a planographic printing plate precursor, comprising a support and a recording layer formed on the support containing a sulfonium salt (A), an alkali-soluble resin (B), and an infrared absorbent (C), wherein the sulfonium salt (A) has a solubility of 25 mg/ml or more in aqueous 0.1 mol/L NaOH solution having a liquid temperature of 25°C at normal room temperature and atmospheric pressure. The invention provides a high-sensitivity planographic printing plate precursor that allows direct plate making by scanning exposure based on digital signals, for example and also suppresses generation of development scum.





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