Lithographic form plate

Details Lithographic form plate Lithographic form plate

B - Operations, Transporting

41

N

B41N 1/00 (2006.01) B41C 1/10 (2006.01) G03F 7/012 (2006.01) G03F 7/021 (2006.01) G03F 7/027 (2006.01)

Patent

CA 2187784

An original form plate for a novel photosensitive lithographic form plate, in which development processing is simple, and which possesses a high ink repellent property without undergoing a desensitization and can use pure water as a dampening water, can be produced by using a lithographic form plate, in which (1) a non-printing area portion made of a hydrophilic swelling layer has an amount of water absorption of 1 to 50 g/m2 and a printing area portion has a less amount of water absorption than that of the non-printing area portion; (2) the non-printing area portion made of a hydrophilic swelling layer has an initial elastic modulus of 0.01 to 10 kg/mm2 and the printing area portion has a larger initial elastic modulus than that of the non-printing area portion; (3) the non-printing area portion made of a hydrophilic swelling layer has a water swelling rate of 10 to 2000 % and the printing area portion has a less water swelling rate than that of the non-printing area portion; or (4) the non- printing area portion made of a hydrophilic swelling layer has a phase separation structure composed of at least two phases, that is, a phase, of which a main component comprises at least a hydrophilic polymer, and a phase, of which a main component comprises a hydrophobic polymer.

Plaque originale pour plaque offset photosensible de type nouveau dans laquelle le procédé de développement est simple, possédant une forte capacité de repousser l'encre sans subir de désensibilisation et pouvant utiliser de l'eau pure comme eau de mouillage, pouvant être produite à l'aide d'une plaque offset dans laquelle (1) une partie non imprimante constituée d'une couche gonflante hydrophile peut absorber une quantité d'eau comprise entre 1 et 50 g/m?2¿ et une partie imprimante peut absorber une quantité d'eau inférieure à celle de la partie non imprimante; (2) la partie non imprimante constituée d'une couche gonflante hydrophile présente un module d'élasticité initial compris entre 0,01 et 10 kg/mm?2¿ et la partie imprimante présente un module d'élasticité initial supérieur à celui de la partie non imprimante; (3) la partie non imprimante constituée d'une couche gonflante hydrophile présente un taux de gonflement à l'eau compris entre 10 et 2000 % et la partie imprimante présente un taux de gonflement à l'eau inférieur à celui de la partie non imprimante; ou (4) la partie non imprimante constituée d'une couche gonflante hydrophile présente une structure de séparation de phases composée d'au moins deux phases, à savoir une phase dont un constituant principal comprend au moins un polymère hydrophile et une phase dont un constituant principal comprend un polymère hydrophobe.

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