PLATE MAKING METHOD FOR PLANOGRAPHIC PRINTING PLATE

Japanese Patent JP3836581

B2

PROBLEM TO BE SOLVED: To provide a plate making method for planographic printing plate for IR laser improved in low image forming ability of a recording layer using a high molecular compd. soluble in an aq. alkali soln., not limited in handling place, less liable to the lowering of the developability after storage, and capable of a direct photomechanical process.
SOLUTION: A planographic printing plate with a photosensitive layer formed on the hydrophilic substrate by coating with a positive type photosensitive compsn. for IR laser is exposed with IR laser and developed with an aq. alkali soln. The photosensitive compsn. contains a high molecular compd. (A) soluble in the aq. alkali soln. and having at least one function group selected from among phenolic hydroxyl, sulfonamido and active imido groups, a compd. (B) which lowers the alkali solubility of the compound A by compatibility with the compound A and reduces its solubility lowering action by heating, a compd. (C) which absorbs light and generates heat and a cyclic acid anhydride (D). One compd. having both the characteristics of the component B, C, e.g. a cyanine dye may be used in place of the component B, C.

Ikuo Kawauchi

JP28575597A

October 25, 2006

October 17, 1997

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Fuji Photo Film Co., Ltd.

G03F7/004; G03F7/039; B41C1/055; B41N1/14; G03F7/00; (IPC1-7): G03F7/004; G03F7/004; B41C1/055; B41N1/14; G03F7/00; G03F7/039

JP7285275A
JP9043847A
JP6148888A
JP56069192A

Atsushi Nakajima
Kato Kazunori
Katsuichi Nishimoto
Hiroshi Fukuda

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