Patent US3971660A successfully refreshed from Google Patents.
US3971660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lithographic printing plate comprising hydrophilic layer of polyvinylacetate crosslinked with tetraethylorthosilicate
Assignee: Eastman Kodak Co
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Filing: 1975-07-17
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Granted: 1976-07-27
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Expires: 1995-07-17
Abstract
Abstract A method of providing a printing plate comprises coating on a support a layer having a hydrophilic surface comprising the homogeneous reaction product of hydrolyzed polyvinyl acetate and hydrolyzed tetraethyl orthosilicate. The coating may also contain pigments such as titanium dioxide and the like. A printing plate is provided having a support having thereon a layer having a hydrophilic surface and over the layer a silver precipitating layer, preferably comprising nickel sulfide and silver iodide. An image is provided in the silver precipitating layer by diffusion transfer and treated with a thiol or similar sulfur-containing material to improve the ink-water balance of the plate.
Inventors
- 👤 Henry C. Staehle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:39
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/06; G03F7/07
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
48 words
A lithographic element comprising a support having thereon a layer having a hydrophilic surface, said layer comprising a crosslinked material that is substantially free from discrete particles and comprises hydrolyzed polyvinyl acetate crosslinked with hydrolyzed tetraethylorthosilicate, said element having thereon an image-bearing layer or an image forming layer.
Claim 2
Dependent Claim
48 words
A lithographic element comprising a support having thereon a layer having a hydrophilic surface, said layer comprising a crosslinked material that is substantially free from discrete particles and comprises hydrolyzed polyvinyl acetate crosslinked with hydrolyzed tetraethylorthosilicate, said element having thereon an image-bearing layer or an image forming layer.
Claim 3
Dependent Claim
18 words
A lithographic element as described in claim 1 wherein the layer having the hydrophilic surface comprises a pigment.
Claim 4
Dependent Claim
14 words
A lithographic element as described in claim 2 wherein the pigment comprises titanium dioxide.
Claim 5
Dependent Claim
16 words
A lithographic element as described in claim 1 wherein said image-forming layer is a light-sensitive material.
Claim 6
Dependent Claim
21 words
A lithographic element as described in claim 4 wherein the light-sensitive material comprises a silver halide emulsion or a light-sensitive polymer.
Claim 7
Dependent Claim
16 words
A lithographic element as described in claim 1 wherein said image-forming layer comprises a silver precipitant.
Claim 8
Dependent Claim
21 words
A lithographic element as described in claim 6 wherein the silver precipitant comprises a mixture of nickel sulfide and silver iodide.
Claim 9
Dependent Claim
63 words
A lithographic element comprising a support having thereon a layer having a hydrophilic surface, the layer comprising (a) a crosslinked material that is substantially free from discrete particles and comprises hydrolyzed polyvinyl acetate crosslinked with hydrolyzed tetraethylorthosilicate and (b) a pigment, the element further comprising a silver precipitant located in a layer contiguous to said crosslinked material or located in said crosslinked material.
Claim 10
Dependent Claim
63 words
A lithographic element comprising a support having thereon a layer having a hydrophilic surface, the layer comprising (a) a crosslinked material that is substantially free from discrete particles and comprises hydrolyzed polyvinyl acetate crosslinked with hydrolyzed tetraethylorthosilicate and (b) a pigment, the element further comprising a silver precipitant located in a layer contiguous to said crosslinked material or located in said crosslinked material.
Claim 11
Dependent Claim
14 words
A lithographic element as described in claim 8 wherein the pigment comprises titanium dioxide.
Claim 12
Dependent Claim
17 words
A lithographic element as described in claim 1 wherein the support is selected from paper or aluminum.
Claim 13
Dependent Claim
15 words
A lithographic element as described in claim 10 wherein the paper is polyolefin coated paper.
Claim 14
Dependent Claim
24 words
A lithographic element as described in claim 1 wherein the hydrolyzed tetraethylorthosilicate is hyrolyzed with from 20 weight percent to 200 weight percent water.
Claim 15
Dependent Claim
26 words
A lithographic element as described in claim 1 wherein the hydrolyzed polyvinyl acetate is hydrolyzed with from 75 weight percent to 100 weight percent of water.
Claim 16
Dependent Claim
43 words
A lithographic element as described in claim 1 wherein the hydrolyzed tetraethylorthosilicate is hydrolyzed with from 20 weight percent to 200 weight percent of water and the hydrolyzed polyvinyl acetate is hydrolyzed with from 75 weight percent to 100 weight percent of water.
Claim 17
Dependent Claim
42 words
A lithographic element as described in claim 1 wherein the hydrolyzed tetraethylorthosilicate is present in said crosslinked material in an amount of from about 1 part by weight to about 50 parts by weight per part by weight of hydrolyzed polyvinyl acetate.
Claim 18
Dependent Claim
41 words
A lithographic element as described in claim 1 wherein the hydrolyzed tetraethylorthosilicate is present in said crosslinked material in an amount of from about 1.5 parts by weight to about 9 parts by weight per part by weight of hydrolyzed polyvinylacetate.
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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) | 1979-07-27 | 1980-01-26 | 1980-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-27 | 1984-01-26 | 1984-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-27 | 1988-01-26 | 1988-07-27 | $7700.00 | Window Closed / Lapsed |