Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – To produce printing surface
Patent
1997-03-13
1999-03-16
Rodee, Christopher D.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
To produce printing surface
430117, 430114, G03G 1376, G03G 1310
Patent
active
058828281
ABSTRACT:
A method for preparation of a printing plate by an electrophotographic process comprising, in order, a) forming a toner image on an electrophotographic light-sensitive element having a release surface by an electrophotographic process using a liquid developer comprising a dispersion medium having dispersed therein toner grains each containing at least one resin (A) having a glass transition point of from 20.degree. C. to 80.degree. C. or a softening point of from 35.degree. C. to 100.degree. C. and at least one resin (B) having a glass transition point or a softening point at least 2.degree. C. lower than that of the resin (A), b) drying the toner image to remove the dispersion medium thereby causing at least partial adhesion between the toner grains, c) bringing the toner image into contact with an intermediate transfer medium having a surface adhesion force of not less than 3 gram.multidot.force at temperature (T.sub.1) and not more than 40 gram.multidot.force at temperature (T.sub.2), at the temperature (T.sub.1) to transfer the toner image onto the intermediate transfer medium, and d) bringing the toner image into contact with a final receiving material having a surface capable of providing a hydrophilic surface suitable for lithographic printing at the time of printing at the temperature (T.sub.2) higher than the temperature (T.sub.1 to transfer the toner image onto the final receiving material. According to the method of the present invention, the toner image formed from a liquid developer is transferred with good efficiency onto the final receiving material through the intermediate transfer medium, and the printing plate obtained provides a large number of prints having highly accurate images free from background stain. An apparatus suitable for conducting the method is also disclosed.
REFERENCES:
patent: 3933490 (1976-01-01), Tsuchiya
patent: 5019477 (1991-05-01), Felder
patent: 5601958 (1997-02-01), Kato et al.
patent: 5679492 (1997-10-01), Chamberlain et al.
patent: 5700612 (1997-12-01), Kato et al.
Kato Eiichi
Nakazawa Yusuke
Fuji Photo Film Co. , Ltd.
Rodee Christopher D.
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