US3869285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plate-making master and method for producing a printing plate which does not require dampening water
Assignee: Fujifilm Holdings Corp
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Filing: 1973-05-15
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Granted: 1975-03-04
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Expires: 1993-05-15
Abstract
Abstract A planographic printing plate that does not require dampening water during printing is prepared by electrophotographically forming an ink-receptive portion and an ink-repelling portion on a plate-making master comprising a support, a photoconductive substance and a silicone rubber thereon, either as two separate layers or as a mixed layer.
Inventors
- 👤 Asaji Kondo
- 👤 Shinzo Kishimoto
- 👤 Kenichiro Yazawa
- 👤 Shizuo Miyano
- 👤 Satoru Honjo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:14
CPC Classifications
B; B41; B41N; B41N1/00; B41N1/003; G; G03; G03G; G03G13/00; G03G13/26; G03G13/28; G03G13/286; G03G5/00; G03G5/14; G03G5/147; G03G5/14708; G03G5/14713; G03G5/14747; G03G5/14773
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
116 words
A METHOD FOR PRODUCING A PRINTING THAT DOES NOT REQUIRE DAMPENING WATER DURING PRINTING, WHICH COMPRISES ELECTROSTATICALLY CHARGING A PLATE-MAKING MASTER, SAID MASTER COMPRISING A SUPPORT AND A PHOTOSENSITIVE LAYER FORMED THEREON CONSISTING ESSENTIALLY OF A MIXTURE OF A PHOTOCONDUCTIVE SUBSTANCE AND A SILICONE RUBBER IN A RATIO OF 6-0.1:1, UNIFORMLY IN A DARK PLACE, EXPOSING IT THROUGH AN ORIGINAL DEVELOPING IT WITH A TONER, FIXING THE TONER BY HEATING THEREBY TO FORM ON SAID MASTER AN INK RECEPTIVE PORTION HAVING THE TONER ADHERE THERETO AND AN INK REPELLING PORTION FREE FROM THE TONER, AND THEN TREATING THE RESULTING PLATE WITH AN ACID TO THEREBY DISSOLVE THE PHOTOCONDUCTIVE SUBSTANCE AT THE PORTION FREE FROM THE TONER.
Claim 2
Independent Claim
116 words
A METHOD FOR PRODUCING A PRINTING THAT DOES NOT REQUIRE DAMPENING WATER DURING PRINTING, WHICH COMPRISES ELECTROSTATICALLY CHARGING A PLATE-MAKING MASTER, SAID MASTER COMPRISING A SUPPORT AND A PHOTOSENSITIVE LAYER FORMED THEREON CONSISTING ESSENTIALLY OF A MIXTURE OF A PHOTOCONDUCTIVE SUBSTANCE AND A SILICONE RUBBER IN A RATIO OF 6-0.1:1, UNIFORMLY IN A DARK PLACE, EXPOSING IT THROUGH AN ORIGINAL DEVELOPING IT WITH A TONER, FIXING THE TONER BY HEATING THEREBY TO FORM ON SAID MASTER AN INK RECEPTIVE PORTION HAVING THE TONER ADHERE THERETO AND AN INK REPELLING PORTION FREE FROM THE TONER, AND THEN TREATING THE RESULTING PLATE WITH AN ACID TO THEREBY DISSOLVE THE PHOTOCONDUCTIVE SUBSTANCE AT THE PORTION FREE FROM THE TONER.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein zinc oxide is used as the photoconductive substance.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein a one-package silicone rubber curable at room temperature is used as the silicone rubber.
Claim 5
Dependent Claim
16 words
The process of claim 1 wherein a two-package silicone rubber is used as the silicone rubber.
Claim 6
Independent Claim
124 words
A method for producing a printing plate that does not require dampening water during printing, which comprises electrostatically charging a plate-making master, said master comprising a support, a photosensitive layer formed thereon and having photoconductivity, and a layer, formed on said photosensitive layer, consisting essentially of a photoconductive substance and a silicone rubber in a ratio of 6-0.1:1, uniformly in a dArk place, exposing it through an original, developing it with a toner, fixing the toner by heating thereby to form on said master an ink receptive portion having the toner adhered thereto and an ink repelling portion free from the toner, and then treating the resulting plate with an acid to thereby dissolve the photoconductive substance at the portion free from the toner.
Claim 7
Independent Claim
124 words
A method for producing a printing plate that does not require dampening water during printing, which comprises electrostatically charging a plate-making master, said master comprising a support, a photosensitive layer formed thereon and having photoconductivity, and a layer, formed on said photosensitive layer, consisting essentially of a photoconductive substance and a silicone rubber in a ratio of 6-0.1:1, uniformly in a dArk place, exposing it through an original, developing it with a toner, fixing the toner by heating thereby to form on said master an ink receptive portion having the toner adhered thereto and an ink repelling portion free from the toner, and then treating the resulting plate with an acid to thereby dissolve the photoconductive substance at the portion free from the toner.
Claim 8
Dependent Claim
14 words
The process of claim 5 wherein zinc oxide is used as the photoconductive substance.
Claim 9
Dependent Claim
20 words
The process of claim 5 wherein a one-package silicone rubber curable at room temperature is used as the silicone rubber.
Claim 10
Dependent Claim
16 words
The process of claim 5 wherein a two-package silicone rubber is used as the silicone rubber.
Claim 11
Independent Claim
136 words
A method for producing a printing plate that does not require dampening water during printing, which comprises electrostatically charging a plate-making master, said master comprising a support, a photosensitive layer formed thereon consisting essentially of a mixture of an inorganic photoconductive substance and an insulating binder in a ratio of 2-20:1, and a layer formed thereon consisting of a photoconductive substance and a silcone rubber in a ratio of 6-0.01:1, uniformly in a dark place, exposing it through an original, developing it with a toner, fixing the toner by heating thereby to form on said master an ink receptive portion having the toner adhered thereto and an ink repelling portion free from the toner, and then treating the resulting plate with an acid to thereby dissolve the photoconductive substance at the portion free from the toner.
Claim 12
Independent Claim
136 words
A method for producing a printing plate that does not require dampening water during printing, which comprises electrostatically charging a plate-making master, said master comprising a support, a photosensitive layer formed thereon consisting essentially of a mixture of an inorganic photoconductive substance and an insulating binder in a ratio of 2-20:1, and a layer formed thereon consisting of a photoconductive substance and a silcone rubber in a ratio of 6-0.01:1, uniformly in a dark place, exposing it through an original, developing it with a toner, fixing the toner by heating thereby to form on said master an ink receptive portion having the toner adhered thereto and an ink repelling portion free from the toner, and then treating the resulting plate with an acid to thereby dissolve the photoconductive substance at the portion free from the toner.
Claim 13
Dependent Claim
14 words
The process of claim 9 wherein zinc oxide is used as the photoconductive substance.
Claim 14
Dependent Claim
32 words
The process of claim 9 wherein a member selected from the group consisting of vinyl resins, silicone resins, phenol resins, cellulose derivatives, styrene rubbers and epoxy resins is used as the binder.
Claim 15
Dependent Claim
23 words
The process of claim 11 wherein a vinyl copolymer containing acrylic ester units or a modified alkyd resin is used as the binder.
Claim 16
Dependent Claim
20 words
The process of claim 9 wherein a one-package silicone rubber curable at room temperature is used as the silicone rubber.
Claim 17
Dependent Claim
16 words
The process of claim 9 wherein a two-package silicone rubber is used as the silicone rubber.
References Cited (Backward Citations)
US3775115A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |