US4259905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waterless planographic printing plate with polysiloxane coating
Assignee: Toray Industries Inc
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Filing: 1979-06-12
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Granted: 1981-04-07
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Expires: 1999-06-12
Abstract
Abstract A waterless planographic printing plate having toner image areas of ink receptivity and non-image areas of ink releasability is provided, which plate has a substrate and an overlying layer coated on the substrate. The overlying layer is predominantly comprised of a reaction product of 50 to 99% by weight of a polymeric material having, on the average, at least two hydroxyl groups per molecule and exhibiting a high adhesion to the ink-receptive toner, and 1 to 50% by weight of an organopolysiloxane having hydroxyl end groups. The overlying layer preferably consists of a relatively thin surface layer substantially composed of the organopolysiloxane, and a relatively thick inner layer sandwiched between the surface layer and the substrate and having an islands-in-sea heterophase structure composed of the organopolysiloxane islands substantially uniformly dispersed in the sea of the polymeric material. The relatively thin surface layer has holes through which the inner layer predominantly composed of the polymeric material is exposed.
Inventors
- 👤 Shigeo Abiko
- 👤 Tadami Kamaishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:05
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/26; G03G13/28; G03G13/286; B; B41; B41N; B41N1/00; B41N1/003
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
104 words
A waterless planographic printing plate having toner image areas of ink receptivity and non-image areas of ink releasability, which plate comprises a substrate and an overlying layer coated on the substrate, said overlying is predominantly comprised of a reaction product of 50 to 99% by weight of a polymeric material selected from the group consisting of phenol resins, 1, 2-polybutadiene or its derivatives and acrylate or methacrylate resins, said polymeric material having, on the average, at least two hydroxyl groups per molecule and exhibiting a high adhesion to the ink-receptive toner, and 1 to 50% by weight of an organopolysiloxane having hydroxyl end groups.
Claim 2
Dependent Claim
104 words
A waterless planographic printing plate having toner image areas of ink receptivity and non-image areas of ink releasability, which plate comprises a substrate and an overlying layer coated on the substrate, said overlying is predominantly comprised of a reaction product of 50 to 99% by weight of a polymeric material selected from the group consisting of phenol resins, 1, 2-polybutadiene or its derivatives and acrylate or methacrylate resins, said polymeric material having, on the average, at least two hydroxyl groups per molecule and exhibiting a high adhesion to the ink-receptive toner, and 1 to 50% by weight of an organopolysiloxane having hydroxyl end groups.
Claim 3
Dependent Claim
49 words
A waterless planographic printing plate according to claim 1, wherein said polymeric material having, on the average, at least two hydroxyl groups is a hydroxyl group-containing 1,2-polybutadiene or its derivatives, having an 1,2-bond content of at least approximately 50% and a molecular weight of not larger than approximately 10,000.
Claim 4
Dependent Claim
23 words
A waterless planographic printing plate according to claim 2, wherein said 1,2-polybutadiene or its derivatives have an 1,2-bond content of at least 90%.
Claim 5
Dependent Claim
25 words
A waterless planographic printing plate according to claim 2, wherein said 1,2-polybutadiene or its derivatives have a molecular weight of from approximately 500 to 5,000.
Claim 6
Dependent Claim
17 words
A waterless planographic printing plate according to claim 2 or 3, wherein said 1,2-polybutadiene is hydroxyl-terminated 1,2-polybutadiene.
Claim 7
Dependent Claim
60 words
A waterless planographic printing plate according to claim 1, wherein said reaction product is formed on the substrate from a coating solution containing the hydroxyl group-containing polymeric material and the organopolysiloxane in amounts of 50 to 99% by weight and 1 to 50% by weight, respectively, based on the total weight of the hydroxyl group-containing polymeric material and the organopolysiloxane.
Claim 8
Dependent Claim
36 words
A waterless planographic printing plate according to claim 1 or 6, wherein the amounts of the hydroxyl group-containing polymeric material and the organopolysiloxane are 70 to 97% by weight and 3 to 30% by weight, respectively.
Claim 9
Dependent Claim
29 words
A waterless planographic printing plate according to claim 6, wherein said coating solution further contains at least one compound selected from group consisting of cross-linking agents and cross-linking catalysts.
Claim 10
Dependent Claim
59 words
A waterless planographic printing plate according to claim 6, wherein said coating solution further contains a cross-linking agent and a cross-linking catalyst, the amount (C) of said cross-linking agent and the amount (D) of said cross-linking catalyst satisfying the formulae: (A+B)/C>100/20 C/D>100/10 wherein A and B are the amounts of the organopolysiloxane and the hydroxyl group-containing polymeric material, respectively.
Claim 11
Dependent Claim
50 words
A waterless planographic printing plate according to claim 8 or 9, wherein the cross-linking agent is a silane represented by the general formula: R.sub.4-a SiX.sub.a wherein R is a hydrocarbon radical having 1 to 18 atoms, X is a hydrolyzable radical and a is an integer of 1 to 3.
Claim 12
Dependent Claim
37 words
A waterless planographic printing plate according to claim 8 or 9, wherein the cross-linking catalyst is at least one compound selected from the group consisting of organotin compounds, organozinc compounds, organotitanium compounds, organoiron compounds and organolead compounds.
Claim 13
Dependent Claim
25 words
A waterless planographic printing plate according to claim 1, wherein said substrate is cast coated paper or coated paper finished by using a super calender.
Claim 14
Dependent Claim
62 words
A waterless planographic printing plate according to claim 1, wherein said overlying layer consists of a relatively thin surface layer substantially composed of the organopolysiloxane and a relatively thick thin layer sanwiched between the surface layer and the substrate; said inner layer having an islands-in-sea heterophase structure composed of the organopolysiloxane islands substantially uniformly disposed in the sea of the polymeric material.
Claim 15
Dependent Claim
24 words
A waterless planographic printing plate according to claim 13, wherein said surface layer has a thickness of from approximately 5 angstroms to 0.5 microns.
Claim 16
Dependent Claim
30 words
A waterless planographic printing plate according to claim 13 or 14, wherein said surface layer has holes through which the inner layer predominantly composed of the polymeric material is exposed.
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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) | 1984-04-06 | 1984-10-06 | 1985-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-06 | 1988-10-06 | 1989-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-06 | 1992-10-06 | 1993-04-07 | $7700.00 | Window Closed / Lapsed |