US4617579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophilic protective coatings for electroerosion printing
Assignee: International Business Machines Corp
•
Filing: 1984-04-05
•
Granted: 1986-10-14
•
Expires: 2004-04-05
Abstract
Abstract Electroerosion recording materials for "direct negative" and "offset master" are provided with a surface protective coating of solid conductive lubricant dispersed in a hydrophilic, crosslinked polymeric matrix. The protective films are especially useful where direct offset masters are produced without removal of non-eroded lubricant film. The recording medium of this invention provides use as a defect-free "direct negative" and/or "direct offset master", without requiring the removal of the overlayer prior to use on the printing press. The protective coatings are applied from aqueous dispersions of polymer-particulate compositions and thus avoiding the use of organic solvents.
Inventors
- 👤 Krishna G. Sachdev
- 👤 Ali Afzali-Ardakani
- 👤 Keith S. Pennington
- 👤 Mitchell S. Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:03
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/24; B41M5/245; B41N; B41N3/00; B41N3/03
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
84 words
Electroerosion recording material comprising: a non-conductive support member, a thin conductive member on said support member, said conductive member being evaporable in response to being heated in an electroerosion recording process, and an overlayer of protective lubricant composition on the stylus-contacting surface of said material, said lubricant composition comprising conductive particles of high lubricity dispersed in a hydrophilic cross-linked polymeric binder, the ratio of binder to lubricant particles in said overlayer being sufficient substantially to prevent flake-off during handling and use of said material.
Claim 2
Dependent Claim
84 words
Electroerosion recording material comprising: a non-conductive support member, a thin conductive member on said support member, said conductive member being evaporable in response to being heated in an electroerosion recording process, and an overlayer of protective lubricant composition on the stylus-contacting surface of said material, said lubricant composition comprising conductive particles of high lubricity dispersed in a hydrophilic cross-linked polymeric binder, the ratio of binder to lubricant particles in said overlayer being sufficient substantially to prevent flake-off during handling and use of said material.
Claim 3
Dependent Claim
30 words
The material of claim 1, wherein said binder is a water-dispersible hydrophilic polymer selected from the group consisting of cellulosic polymers, hydroxyethylene polymers, polyethylene glycols, hydroxypropylene polymers and polyvinyl alcohols.
Claim 4
Dependent Claim
33 words
The material of claim 1 or claim 2, wherein the amount of binder in said overlayer is from 20% to 50% by weight of said overlayer, the balance essentially being solid lubricating particles.
Claim 5
Dependent Claim
14 words
The material of claim 1 or claim 2 wherein the conductive particles are graphite.
Claim 6
Dependent Claim
33 words
The material of claim 1 or claim 2 wherein the support is a hydrophobic polymer such that, after electroerosion of the conductive member, the material may be utilized in direct offset master applications.
Claim 7
Dependent Claim
30 words
The material of claim 4 wherein the support is a hydrophobic polymer such that, after electroerosion of the conductive member, the material may be utilized in direct offset master applications.
Claim 8
Dependent Claim
20 words
The material of claim 1, wherein said polymeric binder has been cross-linked through the use of a chemical cross-linking agent.
Claim 9
Dependent Claim
18 words
The material of claim 7, wherein said chemical cross-linking agent is selected from titanium esters and titanium organochelates.
Claim 10
Dependent Claim
39 words
The material of claim 1 or claim 2, further comprising a thin, hard layer of cross-linked polymer between said support and said conductive member, said layer serving to increase the resistance to scratching of said member during electroerosion recording.
Claim 11
Dependent Claim
36 words
The material of claim 4, further comprising a thin, hard layer of cross-linked polymer between said support and said conductive member, said layer serving to increase the resistance to scratching of said member during electroerosion recording.
Claim 12
Dependent Claim
36 words
The material of claim 5, further comprising a thin, hard layer of cross-linked polymer between said support and said conductive member, said layer serving to increase the resistance to scratching of said member during electroerosion recording.
Claim 13
Dependent Claim
20 words
The material of claim 9, wherein said layer between said support and said conductive member is filled with silica particles.
Claim 14
Dependent Claim
76 words
An electroerosion recording medium, comprising a nonconductive support member, a thin conductive layer that is erodible in response to being heated in an electroerosion recording process wherein electrical current flows from a stylus that contacts said recording medium, and an overlayer on the stylus-contacted side of said thin conductive layer, said overlayer being a protective lubricant layer comprised of solid lubricant particles dispersed in a hydrophilic polymeric binder where said polymeric binder is a cellulose polymer.
Claim 15
Dependent Claim
76 words
An electroerosion recording medium, comprising a nonconductive support member, a thin conductive layer that is erodible in response to being heated in an electroerosion recording process wherein electrical current flows from a stylus that contacts said recording medium, and an overlayer on the stylus-contacted side of said thin conductive layer, said overlayer being a protective lubricant layer comprised of solid lubricant particles dispersed in a hydrophilic polymeric binder where said polymeric binder is a cellulose polymer.
Claim 16
Dependent Claim
13 words
The recording medium of claim 13, where said cellulose polymer is hydroxyethyl cellulose.
Claim 17
Dependent Claim
13 words
The recording medium of claim 14, where said solid lubricant particles are graphite.
Claim 18
Dependent Claim
12 words
The recording medium of claim 13, where said polymeric binder is cross-linked.
Claim 19
Dependent Claim
13 words
The recording medium of claim 13, where said solid lubricant particles are graphite.
Claim 20
Dependent Claim
12 words
The recording medium of claim 13, where said polymeric binder is water-dispersible.
Claim 21
Dependent Claim
82 words
An electroerosion recording medium, comprising: a nonconductive support member, a thin conductive layer that is erodible in response to being heated in an electroerosion recording process wherein electrical current flows from a stylus that contacts said recording medium, and an overlayer on the stylus-contacted side of said thin conductive layer, said overlayer being a protective lubricant layer comprised of said lubricant particles dispersed in a hydrophilic polymeric binder where said hydrophilic polymeric binder is a polymer having free reactive carboxyl groups therein.
Claim 22
Dependent Claim
82 words
An electroerosion recording medium, comprising: a nonconductive support member, a thin conductive layer that is erodible in response to being heated in an electroerosion recording process wherein electrical current flows from a stylus that contacts said recording medium, and an overlayer on the stylus-contacted side of said thin conductive layer, said overlayer being a protective lubricant layer comprised of said lubricant particles dispersed in a hydrophilic polymeric binder where said hydrophilic polymeric binder is a polymer having free reactive carboxyl groups therein.
Claim 23
Dependent Claim
12 words
The recording medium of claim 19, where said polymeric binder is cross-linked.
Claim 24
Dependent Claim
13 words
The recording medium of claim 20, where said solid lubricant particles include graphite.
Claim 25
Dependent Claim
13 words
The recording medium of claim 19, where said solid lubricant particles include graphite.
Claim 26
Dependent Claim
92 words
An electroerosion recording medium, comprising: a nonconductive support member, a thin conductive layer that is erodible in response to being heated in an electroerosion recording process wherein electrical current flows from a stylus that contacts said recording medium, and an overlayer on the stylus-contacting side of said thin conductive layer, said overlayer being a protective lubricant layer comprised of solid lubricant particles dispersed in a cross-linkable hydrophilic polymeric binder where said overlayer is cast from an aqueous dispersion of said solid lubricant particles in said hydrophilic polymeric binder, said binder being watersoluble.
Claim 27
Dependent Claim
92 words
An electroerosion recording medium, comprising: a nonconductive support member, a thin conductive layer that is erodible in response to being heated in an electroerosion recording process wherein electrical current flows from a stylus that contacts said recording medium, and an overlayer on the stylus-contacting side of said thin conductive layer, said overlayer being a protective lubricant layer comprised of solid lubricant particles dispersed in a cross-linkable hydrophilic polymeric binder where said overlayer is cast from an aqueous dispersion of said solid lubricant particles in said hydrophilic polymeric binder, said binder being watersoluble.
Claim 28
Dependent Claim
13 words
The recording medium of claim 23, where said thin conductive layer is Al.
References Cited (Backward Citations)
US3831179A
Cited
US4134341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-13 | 1990-04-14 | 1990-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-13 | 1994-04-14 | 1994-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-13 | 1998-04-14 | 1998-10-14 | $7700.00 | Window Closed / Lapsed |