Patent US4427765A successfully refreshed from Google Patents.
US4427765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophilic coating of salt-type phosphorus or sulfur polymer on aluminum support materials for offset printing plates and process for manufacture and use with light sensitive layer thereon
Assignee: Hoechst AG
•
Filing: 1982-06-23
•
Granted: 1984-01-24
•
Expires: 2002-06-23
Abstract
Abstract The plate-, foil- or strip-shape support materials for offset printing plates are based on chemically, mechanically and/or electromechanically roughened aluminum, or on one of its alloys. Optionally, the aluminum may also have an aluminum oxide layer produced by anodic oxidation. One of the two surfaces the support material has a hydrophilic coating of at least one salt-type hydrophilic organic polymer which is a complex-type product obtained by reacting (a) a water-soluble organic polymer having acid functional groups containing phosphorus or sulfur (for example, polyvinylphosphonic or polyvinylsulfonic acid) with (b) a salt of an at least divalent metal cation. In a process for manufacturing this support material, the complex-type reaction product, dissolved in an aqueous acid, is applied to at least one surface of the support material and the support material thus modified is dried. It is also possible, however, to produce the complex-type reaction product of the components (a) and (b) on the support material. The support material is used in the preparation of offset printing plates having a light-sensitive layer.
Inventors
- 👤 Dieter Mohr
- 👤 Werner Frass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:44
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/03; B41N3/038; B41N3/036
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
154 words
A web-shaped support material for offset printing plates, comprising a base layer comprised of aluminum or an aluminum alloy and having a roughened surface, and a hydrophilic coating of at least one salt-type hydrophilic organic polymer on the roughened surface of the base layer, wherein the salt-type hydrophilic organic polymer consists essentially of a complex-type product obtained by reacting (a) a water soluble organic polymer having acid functional groups containing phosphorus or sulfur selected from the group consisting of polyvinylphosphonic acid, polyvinylmethylphosphinic acid, a phosphoric acid ester of polyvinyl alcohol, polyvinylsulfonic acid, polyvinylbenzenesulfonic acid, a sulfuric acid ester of polyvinyl alcohol, an acetal of polyvinyl alcohol formed with a sulfonated aliphatic aldehyde or a salt of these polymers with a monovalent cation, with (b) a salt of an at least divalent metal cation, and wherein the quantity of complex-type reaction product is less than about 0.1 mg per dm 2 of support material surface.
Claim 2
Dependent Claim
154 words
A web-shaped support material for offset printing plates, comprising a base layer comprised of aluminum or an aluminum alloy and having a roughened surface, and a hydrophilic coating of at least one salt-type hydrophilic organic polymer on the roughened surface of the base layer, wherein the salt-type hydrophilic organic polymer consists essentially of a complex-type product obtained by reacting (a) a water soluble organic polymer having acid functional groups containing phosphorus or sulfur selected from the group consisting of polyvinylphosphonic acid, polyvinylmethylphosphinic acid, a phosphoric acid ester of polyvinyl alcohol, polyvinylsulfonic acid, polyvinylbenzenesulfonic acid, a sulfuric acid ester of polyvinyl alcohol, an acetal of polyvinyl alcohol formed with a sulfonated aliphatic aldehyde or a salt of these polymers with a monovalent cation, with (b) a salt of an at least divalent metal cation, and wherein the quantity of complex-type reaction product is less than about 0.1 mg per dm 2 of support material surface.
Claim 3
Dependent Claim
25 words
An offset printing plate, comprising a support material as defined by claim 1, and a layer of a light-sensitive material coated on the support material.
Claim 4
Dependent Claim
31 words
A support material for offset printing plates as claimed in claim 1, wherein one to three coordination sites of the metal cation are occupied by the functional groups of the polymer.
Claim 5
Dependent Claim
21 words
A support material for offset printing plates, as claimed in claim 1, wherein the metal cation is di-, tri- or tetravalent.
Claim 6
Dependent Claim
65 words
A support material for offset printing plates as claimed in claim 4, wherein the metal cation comprises Bi 3+ , Al 3+ , Fe 3+ , Zr 4+ , Sn 4+ , Ca 2+ , Ti 3+ , Ba 2+ , Sr 2+ , Co 2+ , Fe 2+ , Mn 2+ , Ni 2+ , Cu 2+ , Zn 2+ or Mg 2+ .
Claim 7
Dependent Claim
47 words
A support material for offset printing plates as claimed in claim 1, wherein the base layer further includes an alumi oxide surface layer produced by anodic oxidation. , 7. A support material for offset printing plates as claimed in claim 1, wherein the base layer is electrochemically
Claim 8
Dependent Claim
49 words
roughened. 8. A process for manufacturing the support material for offset printing plates as claimed in claim 1, comprising the steps of applying a solution of the complex-type reaction product in an aqueous acid to at least one surface of the base layer, and drying the support material thus
Claim 9
Dependent Claim
41 words
modified. 9. A process as claimed in claim 8, wherein the complex-type reaction product is dissolved in a concentration of from about 0.05 to 5% by weight in an aqueous acid having a strength of from about 0.1 to 10% by
Claim 10
Dependent Claim
25 words
weight. 10. A process as claimed in claim 9, wherein the complex-type reaction product is dissolved in a concentration of from about 0.1 to 1%
Claim 11
Dependent Claim
26 words
by weight in an about 0.5 to 3% by weight strength aqueous acid. 11. A process as claimed in claim 8, wherein the aqueous acid comprises
Claim 12
Dependent Claim
24 words
phosphoric acid. 12. A process as claimed in claim 8, wherein the complex-type reaction product of the components (a) and (b) is formed on
Claim 13
Dependent Claim
23 words
the support material. 13. A process as claimed in claim 12, which comprises dipping the support material in an aqueous solution of component
Claim 14
Dependent Claim
57 words
(a) and subsequently in an aqueous solution of component (b). 14. A process as claimed in claim 13, wherein the aqueous solution of component (a) contains from about 0.2 to 10% by weight of component (a) and the aqueous solution of component (b) contains from about 0.1% by weight to the point of saturation of component (b).
References Cited (Backward Citations)
US2714066A
Cited
GB894186A
Cited
GB907718A
Cited
US3232783A
Cited
GB895276A
Cited
US3131630A
Cited
US3276868A
Cited
US3163534A
Cited
US3289577A
Cited
US3386850A
Cited
US3298852A
Cited
US3181461A
Cited
US3280734A
Cited
US3440050A
Cited
US3468725A
Cited
US3672885A
Cited
US4153461A
Cited
GB1246696A
Cited
US3672966A
Cited
US3733200A
Cited
US4049746A
Cited
US3769043A
Cited
GB1414575A
Cited
US3861917A
Cited
US3900370A
Cited
US3860426A
Cited
US3859099A
Cited
US3902976A
Cited
US4208212A
Cited
DE2834958A1
Cited
US4376814A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-23 | 1987-07-25 | 1988-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-23 | 1991-07-25 | 1992-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-23 | 1995-07-25 | 1996-01-24 | $7700.00 | Window Closed / Lapsed |