US4019904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Planographic printing plates and a method of preparing them using photopolymerizable organopolysiloxanes with maleimido groups
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1976-03-30
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Granted: 1977-04-26
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Expires: 1996-03-30
Abstract
Abstract The planographic printing plate has ink-receptive and ink-repellent areas provided on its base, the ink-repellent areas being covered with a layer formed by polymerizing and curing a composition which comprise a photopolymerizable organopolysiloxane with maleimido groups. The photopolymerizable organopolysiloxane has easily synthesized. The ink-repellency of the cured organopolysiloxane is excellent. The planographic printing plates can be used without dampening water and have a superior press life.
Inventors
- 👤 Atsumi Noshiro
- 👤 Minoru Takamizawa
- 👤 Yasushi Yamamoto
- 👤 Yoshio Inoue
- 👤 Hitoshi Fujii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:38
CPC Classifications
B; B41; B41N; B41N1/00; B41N1/003; C; C08; C08G; C08G77/00; C08G77/04; C08G77/38; C08G77/382; C08G77/388; C08L; C08L83/00; C08L83/04; C08L83/08; G; G03; G03F; G03F7/00; G03F7/004; G03F7/075; G03F7/0757
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
139 words
A planographic printing plate comprising a base having ink-receptive areas and ink-repellent areas thereon, wherein said ink-repellent areas are covered by a cured and hardened layer of a photopolymerizable organosilicon compound represented by the average unit formula ##STR43## where R 1 is a monovalent aromatic group or a monovalent heterocyclic group, R 2 is an atom or a group selected from the class consisting of a hydrogen atom, a halogen atom, a cyano group and a monovalent hydrocarbon group with 1 to 4 carbon atoms, R 3 is a divalent hydrocarbon group with 1 to 10 carbon atoms, R 4 is a monovalent hydrocarbon group, X is a hydroxy group or a hydrolyzable group, a is 0 or 1, and b, c and d each are numbers expressed by 0<b≦1, 0≦c≦3 and 0≦d≦3, respectively, with the proviso that 0<b+c+d≦4.
Claim 2
Dependent Claim
139 words
A planographic printing plate comprising a base having ink-receptive areas and ink-repellent areas thereon, wherein said ink-repellent areas are covered by a cured and hardened layer of a photopolymerizable organosilicon compound represented by the average unit formula ##STR43## where R 1 is a monovalent aromatic group or a monovalent heterocyclic group, R 2 is an atom or a group selected from the class consisting of a hydrogen atom, a halogen atom, a cyano group and a monovalent hydrocarbon group with 1 to 4 carbon atoms, R 3 is a divalent hydrocarbon group with 1 to 10 carbon atoms, R 4 is a monovalent hydrocarbon group, X is a hydroxy group or a hydrolyzable group, a is 0 or 1, and b, c and d each are numbers expressed by 0<b≦1, 0≦c≦3 and 0≦d≦3, respectively, with the proviso that 0<b+c+d≦4.
Claim 3
Dependent Claim
151 words
A planographic printing plate comprising a base having ink-receptive areas and ink-repellent areas thereon, wherein said ink-repellent areas are covered by a cured and hardened layer of a photopolymerizable organopolysiloxane represented by the average unit formula ##STR44## wherein R 1 is a monovalent aromatic group or a monovalent heterocyclic group, R 2 is an atom or a group selected from the class consisting of a hydrogen atom, a halogen atom, a cyano group and a monovalent hydrocarbon group with 1 to 4 carbon atoms, R 3 is a divalent hydrocarbon group with 1 to 10 carbon atoms, R 5 is a methyl group or a 3,3,3-trifluoropropyl group, a is 0 or 1, e is 0 or 1, n is a positive number not less than 25, and 1 and m each are positive numbers with the proviso that n/l is from 25 to 2,000 and n/m is from 2.5 to 50.
Claim 4
Dependent Claim
151 words
A planographic printing plate comprising a base having ink-receptive areas and ink-repellent areas thereon, wherein said ink-repellent areas are covered by a cured and hardened layer of a photopolymerizable organopolysiloxane represented by the average unit formula ##STR44## wherein R 1 is a monovalent aromatic group or a monovalent heterocyclic group, R 2 is an atom or a group selected from the class consisting of a hydrogen atom, a halogen atom, a cyano group and a monovalent hydrocarbon group with 1 to 4 carbon atoms, R 3 is a divalent hydrocarbon group with 1 to 10 carbon atoms, R 5 is a methyl group or a 3,3,3-trifluoropropyl group, a is 0 or 1, e is 0 or 1, n is a positive number not less than 25, and 1 and m each are positive numbers with the proviso that n/l is from 25 to 2,000 and n/m is from 2.5 to 50.
Claim 5
Dependent Claim
32 words
The planographic printing plate as claimed in claim 2 wherein l, m and n are positive numbers such that n/l is from 50 to 1,000 and n/m is from 5 to 25.
Claim 6
Dependent Claim
18 words
The planographic printing plate as claimed in claim 1 wherein said base is a metal or plastic sheet.
Claim 7
Dependent Claim
18 words
The planographic printing plate as claimed in claim 2 wherein said base is a metal or plastic sheet.
Claim 8
Dependent Claim
22 words
The planographic printing plate as claimed in claim 1 wherein said monovalent aromatic group denoted by R 1 is a phenyl group.
Claim 9
Dependent Claim
22 words
The planographic printing plate as claimed in claim 2 wherein said monovalent aromatic group denoted by R 1 is a phenyl group.
Claim 10
Dependent Claim
30 words
The planographic printing plate as claimed in claim 1 wherein said monovalent heterocyclic group denoted by R 1 is selected from the class consisting of thienyl, furyl and pyridyl groups.
Claim 11
Dependent Claim
30 words
The planographic printing plate as claimed in claim 2 wherein said monovalent heterocyclic group denoted by R 1 is selected from the class consisting of thienyl, furyl and pyridyl groups.
Claim 12
Dependent Claim
87 words
A method for the preparation of the planographic printing plate as claimed in claim 1 comprising the successive steps of a. providing on said base a cured and hardened layer of said photopolymerizable organopolysiloxane, b. overlaying said layer with a transparency of positive patterns in intimate contact, c. irradiating said layer with light imagewise through said transparency, and d. developing the image by washing away the layer of said photopolymerizable organopolysiloxane on unexposed areas, leaving the photopolymerized and cured layer of said photopolymerizable organopolysiloxane on exposed areas.
Claim 13
Dependent Claim
87 words
A method for the preparation of the planographic printing plate as claimed in claim 2 comprising the successive steps of a. providing on said base a cured and hardened layer of said photopolymerizable organopolysiloxane, b. overlaying said layer with a transparency of positive patterns in intimate contact, c. irradiating said layer with light imagewise through said transparency, and d. developing the image by washing away the layer of said photopolymerizable organopolysiloxane on unexposed areas, leaving the photopolymerized and cured layer of said photopolymerizable organopolysiloxane on exposed areas.
Claim 14
Dependent Claim
30 words
The method for the preparation of the planographic printing plate as claimed in claim 10 wherein a fixing step is additionally added after the successive steps of (a) to (d).
Claim 15
Dependent Claim
30 words
The method for the preparation of the planographic printing plate as claimed in claim 11 wherein a fixing step is additionally added after the successive steps of (a) to (d).
Claim 16
Dependent Claim
28 words
The method for the preparation of the planographic printing plate as claimed in claim 12 wherein said fixing step is performed by subjecting the exposed areas to re-exposure.
Claim 17
Dependent Claim
28 words
The method for the preparation of the planographic printing plate as claimed in claim 13 wherein said fixing step is performed by subjecting the exposed areas to re-exposure.
Claim 18
Dependent Claim
33 words
The method for the preparation of the planographic printing plate as claimed in claim 10 wherein said photopolymerizable organopolysiloxane is applied on said base in the form of solution in an organic solvent.
Claim 19
Dependent Claim
33 words
The method for the preparation of the planographic printing plate as claimed in claim 11 wherein said photopolymerizable organopolysiloxane is applied on said base in the form of solution in an organic solvent.
Claim 20
Dependent Claim
30 words
The method for the preparation of the planographic printing plate as claimed in claim 10 wherein said base is coated with a primer before said successive steps are carried out.
Claim 21
Dependent Claim
30 words
The method for the preparation of the planographic printing plate as claimed in claim 11 wherein said base is coated with a primer before said successive steps are carried out.
Claim 22
Dependent Claim
32 words
The method for the preparation of the planographic printing plate as claimed in claim 10 wherein said photopolymerizable organopolysiloxane is applied on said base in the form of mixture with a filler.
Claim 23
Dependent Claim
32 words
The method for the preparation of the planographic printing plate as claimed in claim 11 wherein said photopolymerizable organopolysiloxane is applied on said base in the form of mixture with a filler.
Claim 24
Dependent Claim
35 words
The method for the preparation of the planographic printing plate as claimed in claim 10 wherein said photopolymerizable organopolysiloxane is applied on said base in the form of mixture with an inhibitor for thermal polymerization.
Claim 25
Dependent Claim
35 words
The method for the preparation of the planographic printing plate as claimed in claim 11 wherein said photopolymerizable organopolysiloxane is applied on said base in the form of mixture with an inhibitor for thermal polymerization.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |