US4020761A
Expired / Lapsed
US
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Planographic dry offset master plate
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1975-12-24
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Granted: 1977-05-03
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Expires: 1995-12-24
Abstract
Abstract A planographic dry offset master plate composed of a substrate and, formed thereon, a crosslinking agent-cured layer of a diorganopolysiloxane in which 5 to 40 mole % of the organic groups directly bonded to silicon atoms are phenyl groups. The master plate is especially suitable for plate-making by an electrostatic process and a direct image process. The resulting printing plate has good durability and are free from scumming during printing.
Inventors
- 👤 Makoto Ogiwara
- 👤 Kenichi Tanaka
- 👤 Yukio Kojima
- 👤 Kohichi Nakamura
- 👤 Yuji Harazaki
- 👤 Minoru Takamizawa
- 👤 Yoshio Inoue
- 👤 Toshikazu Sugita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:09
CPC Classifications
B; B41; B41N; B41N1/00; B41N1/003; G; G03; G03G; G03G13/00; G03G13/26; G03G13/28; G03G13/286; Y; Y10; Y10S; Y10S428/00; Y10S428/908; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
103 words
A planographic dry offset master plate which is composed of a substrate which has adhesiveness to and does not absorb or imbibe the silicone material and formed continuously thereon a cured layer of silicone rubber comprising a diorganopolysiloxane having a viscosity of at least about 100,000 centistokes at 25° C., in which from 5 to 40 mole% of the organic groups directly bonded to the silicon atoms are phenyl groups, a cross-linking agent having at least two functional groups in its molecule capable of forming cross-linkages between the molecules of said diorganopolysiloxane by a condensation reaction or an addition reaction, and a catalyst.
Claim 2
Dependent Claim
103 words
A planographic dry offset master plate which is composed of a substrate which has adhesiveness to and does not absorb or imbibe the silicone material and formed continuously thereon a cured layer of silicone rubber comprising a diorganopolysiloxane having a viscosity of at least about 100,000 centistokes at 25° C., in which from 5 to 40 mole% of the organic groups directly bonded to the silicon atoms are phenyl groups, a cross-linking agent having at least two functional groups in its molecule capable of forming cross-linkages between the molecules of said diorganopolysiloxane by a condensation reaction or an addition reaction, and a catalyst.
Claim 3
Dependent Claim
24 words
The planographic dry offset master plate as claimed in claim 1, wherein the other organic groups in said diorganopolysiloxane are methyl and vinyl groups.
Claim 4
Dependent Claim
30 words
The planographic dry offset master plate as claimed in claim 1, wherein said diorganopolysiloxane is a diorgano-polysiloxane terminated at both chain ends with hydroxy groups directly bonded to silicon atoms.
Claim 5
Dependent Claim
18 words
The planographic dry offset master plate as claimed in claim 3, wherein said cross-linking agent is an organohydrogenpolysiloxane.
Claim 6
Dependent Claim
42 words
The planographic dry offset master plate as claimed in claim 1, wherein the organic groups consist of from 5 to 40 mole%, based on the total organic groups, of phenyl groups, at least two vinyl groups, and the balance being methyl groups.
Claim 7
Dependent Claim
18 words
The planographic dry offset master plate as claimed in claim 5, wherein said cross-linking agent is an organohydrogenpolysiloxane.
Claim 8
Dependent Claim
25 words
The planographic dry offset master plate as claimed in claim 1, wherein said substrate is an undercoated paper, a plastic-laminated paper or a plastic film.
Claim 9
Dependent Claim
20 words
The planographic dry offset master plate as claimed in claim 1, wherein said cured layer further comprises an inorganic filler.
Claim 10
Dependent Claim
115 words
A planographic dry offset master plate for an electrostatic process and a direct image process which is composed of a substrate which has adhesiveness to and does not absorb or imbibe the the silicone material, and formed continuously thereon a cured layer of a silicone rubber comprising a diorganopolysiloxane having a viscosity of at least about 100,000 centistokes at 25° C., in which from 10 to 30 mole% of the organic groups directly bonded to the silicon atoms are phenyl groups, and a cross-linking agent having at least two functional groups in its molecule capable of forming cross-linkages between the molecules of said diorganopolysiloxane by a condensation reaction or an addition reaction, and a catalyst.
Claim 11
Dependent Claim
115 words
A planographic dry offset master plate for an electrostatic process and a direct image process which is composed of a substrate which has adhesiveness to and does not absorb or imbibe the the silicone material, and formed continuously thereon a cured layer of a silicone rubber comprising a diorganopolysiloxane having a viscosity of at least about 100,000 centistokes at 25° C., in which from 10 to 30 mole% of the organic groups directly bonded to the silicon atoms are phenyl groups, and a cross-linking agent having at least two functional groups in its molecule capable of forming cross-linkages between the molecules of said diorganopolysiloxane by a condensation reaction or an addition reaction, and a catalyst.
Claim 12
Dependent Claim
62 words
The planographic dry offset master plate as claimed in claim 1, wherein said diorganopolysiloxane is composed of the diorganosiloxane units selected from the group consisting of (CH 3 ) 2 SiO, (C 6 H 5 ) 2 SiO and (C 6 H 5 )(CH 3 )SiO units and terminated at both chain ends with hydroxy groups directly bonded to the silicon atoms.
Claim 13
Dependent Claim
80 words
The planographic dry offset master plate as claimed in claim 1, wherein said diorganopolysiloxane is a methylphenylpolysiloxane with a block structure composed of blocks of (CH 3 ) 2 SiO units and blocks of the organosiloxane units selected from the group consisting of (C 6 H 5 )SiO.sub. 1.5, (C 6 H 5 )(CH 3 )SiO and (C 6 H 5 ) 2 SiO units and terminated at the chain ends with hydroxy groups directly bonded to the silicon atoms.
Claim 14
Dependent Claim
81 words
The planographic dry offset master plate as claimed in claim 1, wherein said diorganopolysiloxane is composed of the organosiloxane units selected from the group consisting of (CH 3 ) 2 SiO, (CH 3 ) 3 SiO 0 .5, (C 6 H 5 ) 2 SiO and (C 6 H 5 )(CH 3 )SiO units and at least two of the organosiloxane units expressed by the formula (CH 2 =CH)(CH 3 )SiO or (CH 2 =CH)(CH 3 ) 2 SiO 0 .5.
Claim 15
Dependent Claim
102 words
The planographic dry offset master plate as claimed in claim 1, wherein said diorganopolysiloxane is a triorganosilyl-terminated diorganopolysiloxane with a block structure composed of blocks of (CH 2 =CH)(CH 3 )SiO and (CH 3 ) 2 SiO units and blocks of the organosiloxane units selected from the group consisting of (C 6 H 5 )SiO 1 .5, (C 6 H 5 )(CH 3 )SiO and (C 6 H 5 ) 2 SiO units, having at least two vinyl groups in the molecule in the form of (CH 2 =CH)(CH 3 )SiO or (CH 2 =CH)(CH 3 ) 2 SiO 0 .5 units.
Claim 16
Dependent Claim
62 words
The planographic dry offset master plate as claimed in claim 9, wherein said diorganopolysiloxane is composed of the diorganosiloxane units selected from the group consisting of (CH 3 ) 2 SiO, (C 6 H 5 ) 2 SiO and (C 6 H 5 )(CH 3 )SiO units and terminated at both chain ends with hydroxy groups directly bonded to the silicon atoms.
Claim 17
Dependent Claim
81 words
The planographic dry offset master plate as claimed in claim 9, wherein said diorganopolysiloxane is a methylphenylpolysiloxane with a block structure composed of blocks of (CH 3 ) 2 SiO units and blocks of the organosiloxane units selected from the group consisting of (C 6 H 5 )SiO 1 .5, (C 6 H 5 )(CH 3 )SiO and (C 6 H 5 ) 2 SiO units and terminated at the chain ends with hydroxy groups directly bonded to the silicon atoms.
Claim 18
Dependent Claim
81 words
The planographic dry offset master plate as claimed in claim 9, wherein said diorganopolysiloxane is composed of the organosiloxane units selected from the group consisting of (CH 3 ) 2 SiO, (CH 3 ) 3 SiO 0 .5, (C 6 H 5 ) 2 SiO and (C 6 H 5 (CH 3 )SiO units and at least two of the organosiloxane units expressed by the formula (CH 2 =CH)(CH 3 )SiO or (CH 2 =CH)(CH 3 ) 2 SiO 0 .5.
Claim 19
Dependent Claim
102 words
The planographic dry offset master plate as claimed in claim 9, wherein said diorganopolysiloxane is a triorganosilyl-terminated diorganopolysiloxane with a block structure composed of blocks of (CH 2 =CH)(CH 3 )SiO and (CH 3 ) 2 SiO units and blocks of the organosiloxane units selected from the group consisting of (C 6 H 5 )SiO 1 .5, (C 6 H 5 )(CH 3 )SiO and (C 6 H 5 ) 2 SiO units, having at least two vinyl groups in the molecule in the form of (CH 2 =CH)(CH 3 )SiO or (CH 2 =CH)(CH 3 ) 2 SiO 0 .5 units.
Claim 20
Dependent Claim
20 words
The planographic dry offset master plate as claimed in claim 1, having a toner image formed on the diorganopolysiloxane surface.
Claim 21
Dependent Claim
19 words
The planographic dry offset master plate as claimed in claim 1, wherein the diorganopolysiloxane has essentially linear molecular configuration.
References Cited (Backward Citations)
US3241486A
Cited
US3209683A
Cited
US3328481A
Cited
US3455732A
Cited
US3511178A
Cited
US3505099A
Cited
US3667996A
Cited
US3606922A
Cited
US3631220A
Cited
US3623942A
Cited
US3627851A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |