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US 5,501,929 AGranted
Method for preparation of printing plate by electrophotographic process
AssigneeFuji Photo Film Co., Ltd.
InventorsEiichi Kato, Sadao Osawa
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AssigneeFuji Photo Film Co., Ltd.
InventorsEiichi Kato, Sadao Osawa
Estimating the term…
A method for preparation of a printing plate by an electrophotographic process comprising forming a toner image on a transfer layer capable of being removed upon a chemical reaction treatment provided on the surface of an electrophotographic light-sensitive element by an electrophotographic process, heat-transferring the toner image together with the transfer layer onto a receiving material a surface of which is capable of providing a hydrophilic surface suitable for lithographic printing at the time of printing, and removing the transfer layer on the receiving material upon the chemical reaction treatment wherein the transfer layer mainly contains a thermoplastic rein (AH) having a glass transition point of from 10.degree. C. to 140.degree. C. or a softening point of from 35.degree. C. to 180.degree. C. and a thermoplastic resin (AL) having a glass transition point of from -50.degree. C. to 45.degree. C. or a softening point of from 0.degree. C. to 60.degree. C. in which a difference in the glass transition point or softening point between the resin (AH) and the resin (AL) is at least 2.degree. C., and the surface of the electrophotographic light-sensitive element being in contact with the transfer layer has an adhesive strength of not more than 200 gram.force, which is measured according to JIS Z 0237-1980 "Testing methods of pressure sensitive adhesive tapes and sheets" is disclosed. The method continuously provides printing plates excellent in image qualities in a stable manner and is suitable for a scanning exposure system using a laser beam. The present invention also discloses a method for preparation of a printing plate by an electrophotographic process wherein the transfer layer is easily prepared on a light-sensitive element on demand in an apparatus and the light-sensitive element is repeatedly employed, thereby reducing a running cost.
A method for preparation of a printing plate by an electrophotographic process comprising forming a toner image on a transfer layer capable of being removed upon a chemical reaction treatment provided on the surface of an electrophotographic light-sensitive element by an electrophotographic process, heat-transferring the toner image together with the transfer layer onto a receiving material a surface of which is capable of providing a hydrophilic surface suitable for lithographic printing at the time of printing, and removing the transfer layer on the receiving material upon the chemical reaction treatment,
A method for preparation of a printing plate by an electrophotographic process comprising forming a transfer layer capable of being removed upon a chemical reaction treatment which mainly contains a thermoplastic resin (AH) having a glass transition point of from 10.degree. C. to 140.degree. C. or a softening point of from 35.degree. C. to 180.degree. C. and a thermoplastic resin (AL) having a glass transition point of from -50.degree. C. to 45.degree. C. or a softening point of from 0.degree. C. to 60.degree. C. in which the glass transition point or softening point of the resin (AH) is at least 2.degree. C. higher than that of the resin (AL) on a surface of an electrophotographic light-sensitive element which surface has an adhesive strength of not more than 200 gram.force, which is measured according to JIS Z 0237-1980 "Testing methods of pressure sensitive adhesive tapes and sheets", forming a toner image on the transfer layer by an electrophotographic process, heat-transferring the toner image together with the transfer layer onto a receiving material a surface of which is capable of providing a hydrophilic surface suitable for lithographic printing at the time of printing, and removing the transfer layer on the receiving material upon the chemical reaction treatment,
An electrophotographic light-sensitive material comprising an electrophotographic light-sensitive element a surface of which has an adhesive strength of not more than 200 gram.force, which is measured according to JIS Z 0237-1980 "Testing methods of pressure sensitive adhesive tapes and sheets" and a transfer layer capable of being removed upon a chemical reaction treatment provided thereon which mainly contains a thermoplastic resin (AH) having a glass transition point of from 10.degree. C. to 140.degree. C. or a softening point of from 35.degree. C. to 180.degree. C. and a thermoplastic resin (AL) having a glass transition point of from -50.degree. C. to 45.degree. C. or a softening point of from 0.degree. C. to 60.degree. C. in which the glass transition point or softening point of the resin (AH) is at least 2.degree. C. higher than that of the resin (AL).
Dependencies are inferred from the claim text.