US5240777A
Expired / Lapsed
US
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Electrostatic recording media
Assignee: INTERNATIONAL MPAPER Co
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Filing: 1992-02-11
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Granted: 1993-08-31
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Expires: 2012-02-11
Abstract
Abstract An electrostatic recording media comprising a support having first and second surfaces, a conductive clay layer on the first surface of the support, at least one dielectric layer present on the conductive layer, and a non-clay conductivizing agent incorporated into the support from the second surface is described. The element is used in electrostatic imaging systems to produce images having improved density in relatively low humidities.
Inventors
- 👤 Paul Wacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:40
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/10; G03G5/101; G03G5/02; G03G5/0202; G03G5/104; G03G5/105; G03G5/107; G03G5/108; G03G5/14; G03G5/142; G03G5/144; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/27; Y10T428/273; Y10T428/277; Y10T428/31504; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
75 words
An electrostatic recording media comprising: (a) a support having first and second surfaces; (b) a conductive clay layer on the first surface of the support; wherein the conductive clay is present in the amount of at least 95% by weight based on the total weight of the layer components; (c) at least one dielectric layer present on the conductive clay layer; and (d) a non-clay conductivizing agent incorporated into the support from the second surface.
Claim 2
Dependent Claim
75 words
An electrostatic recording media comprising: (a) a support having first and second surfaces; (b) a conductive clay layer on the first surface of the support; wherein the conductive clay is present in the amount of at least 95% by weight based on the total weight of the layer components; (c) at least one dielectric layer present on the conductive clay layer; and (d) a non-clay conductivizing agent incorporated into the support from the second surface.
Claim 3
Dependent Claim
25 words
The electrostatic recording media of claim 1 wherein the support is selected from the group consisting of paper, spun bonded polyester, and spun bonded olefin.
Claim 4
Dependent Claim
46 words
The electrostatic recording media of claim 2 wherein the paper is selected from the group consisting of 100% bleached hardwood Kraft paper, bleached softwood Kraft paper, mixture of 100% bleached hardwood Kraft paper and bleached softwood Kraft paper, wood free cotton vellum, and translucent wood-containing paper.
Claim 5
Dependent Claim
18 words
The electrostatic recording media of claim 1 wherein the conductive clay consists essentially of a synthetic hectorite clay.
Claim 6
Dependent Claim
17 words
The electrostatic recording media of claim 1 wherein the conductive clay consists essentially of a montmorillonite clay.
Claim 7
Dependent Claim
21 words
The electrostatic recording media of claim 1 wherein the dielectric layer comprises a polymeric material in an aqueous dispersion or solution.
Claim 8
Dependent Claim
17 words
The electrostatic recording media of claim 6 wherein the polymeric material consists essentially of an acrylic resin.
Claim 9
Dependent Claim
17 words
The electrostatic recording media of claim 6 wherein the dielectric layer further comprises at least one pigment.
Claim 10
Dependent Claim
33 words
The electrostatic recording media of claim 8 wherein the pigment is present in the amount of 10 to 60% by weight based on the weight of the dielectric layer,, on a dry basis.
Claim 11
Dependent Claim
17 words
The electrostatic recording media of claim 1 further comprising an additional dielectric layer present on layer (c).
Claim 12
Dependent Claim
21 words
The electrostatic recording media of claim 10 wherein the additional dielectric layer has the same dielectric composition as dielectric layer (c).
Claim 13
Dependent Claim
21 words
The electrostatic recording media of claim 10 wherein the additional dielectric layer has a different dielectric composition from dielectric layer (c).
Claim 14
Dependent Claim
24 words
The electrostatic recording media of claim 1 wherein the non-clay conductivizing agent is selected from the group consisting of inorganic salts and electroconductive polymers.
Claim 15
Dependent Claim
25 words
The electrostatic recording media of claim 13 wherein the electroconductive polymer is selected from the group consisting of nonionic polymers, anionic polymers and cationic polymers.
Claim 16
Dependent Claim
15 words
The electrostatic recording media of claim 13 wherein the electroconductive polymer is sodium polystyrene sulfonate.
Claim 17
Dependent Claim
15 words
The electrostatic recording media of claim 13 wherein the electroconductive polymer is polydiallyldimethyl ammonium chloride.
Claim 18
Dependent Claim
36 words
The electrostatic recording media of claim 1 wherein the non-clay conductivizing agent is present in the amount of 20 to 100% by weight based on the total weight of the non-clay conductivizing agent containing layer components.
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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) | 1996-08-30 | 1997-03-01 | 1997-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-30 | 2001-03-01 | 2001-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-30 | 2005-03-01 | 2005-08-31 | $7700.00 | Window Closed / Lapsed |