US4163075A
Expired / Lapsed
US
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Electric discharge recording material
Assignee: Sekisui Chemical Co Ltd
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Filing: 1977-07-07
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Granted: 1979-07-31
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Expires: 1997-07-07
Abstract
Abstract A method for performing electric discharge recording on the recording surface of an electric discharge recording material using a discharge recording stylus, which comprises interposing an electrically anisotropic non-recording layer between the recording surface and the discharge recording stylus, said non-recording layer being prepared by dispersing a metal powder in a resin matrix and having a surface resistance of at least 108 ohms and a volume resistance of not more than 104 ohms-cm, and performing electric discharge recording through the non-recording layer; and a composite discharge recording material which comprises (a) an electric discharge-breakable semiconductive resin layer having a surface resistance of 105 to 1016 ohms and a volume resistance of 103 to 1014 ohms-cm, (b) a metal-containing resin layer having a surface resistance of at least 108 ohms and a volume resistance of not more than 104 ohms-cm, which is laminated on one surface of the semiconductive resin layer (a) and is prepared by dispersing a metal powder in a resin matrix and (c) a conductive layer laminated on the other surface of the semiconductive resin layer (a) and having a surface resistance of not more than 104 ohms and a volume resistance of not than 102 ohms-cm.
Inventors
- 👤 Shiro Nakano
- 👤 Masaru Koike
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:01
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/385; B41J2/425; B41M; B41M5/00; B41M5/24; B41M5/245; G; G01; G01D; G01D15/00; G01D15/06; G01D15/08; G01D15/34; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S428/914; Y10T; Y10T428/00; Y10T428/25; Y10T428/256
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
199 words
A composite discharge recording material which comprises (a) an electric discharge-breakable semiconductive resin layer having a surface resistance of 10 5 to 10 16 ohms and a volume resistance of 10 3 to 10 14 ohms-cm, said resin layer being formed by dispersing a conductivity-imparting agent in a resin matrix; (b) a metal-containing resin layer having a surface resistance of at least 10 8 ohms and a volume resistance of not more than 10 4 ohms-cm laminated on one surface of the semiconductive resin layer (a), said resin layer being prepared by dispersing an electrically conductive and stable metal powder having a specific resistance of not more than 2×10 -4 ohm-cm and a particle diameter of from 0.2 to 20 microns in a resin matrix which is a film-forming, electrically insulative thermoplastic or thermosetting resin; and (c) a conductive layer laminated on the other surface of the semiconductive resin layer (a) and having a surface resistance of not more than 10 4 ohms and a volume resistance of not more than 10 2 ohms-cm, said conductive layer comprising a thermoplastic or thermosetting resin having a conductivity-imparting agent dispersed therein, or a vacuum-deposited metal layer or a metal foil layer.
Claim 2
Dependent Claim
199 words
A composite discharge recording material which comprises (a) an electric discharge-breakable semiconductive resin layer having a surface resistance of 10 5 to 10 16 ohms and a volume resistance of 10 3 to 10 14 ohms-cm, said resin layer being formed by dispersing a conductivity-imparting agent in a resin matrix; (b) a metal-containing resin layer having a surface resistance of at least 10 8 ohms and a volume resistance of not more than 10 4 ohms-cm laminated on one surface of the semiconductive resin layer (a), said resin layer being prepared by dispersing an electrically conductive and stable metal powder having a specific resistance of not more than 2×10 -4 ohm-cm and a particle diameter of from 0.2 to 20 microns in a resin matrix which is a film-forming, electrically insulative thermoplastic or thermosetting resin; and (c) a conductive layer laminated on the other surface of the semiconductive resin layer (a) and having a surface resistance of not more than 10 4 ohms and a volume resistance of not more than 10 2 ohms-cm, said conductive layer comprising a thermoplastic or thermosetting resin having a conductivity-imparting agent dispersed therein, or a vacuum-deposited metal layer or a metal foil layer.
Claim 3
Dependent Claim
25 words
The recording material of claim 1 wherein at least one of the semiconductive resin layer (a) and the conductive layer (c) contains a coloring substance.
Claim 4
Dependent Claim
23 words
The recording material of claim 2 wherein the coloring substance is selected from the group consisting of organic and inorganic pigments and dyes.
Claim 5
Dependent Claim
13 words
The recording material of claim 1 wherein the coloring substance is carbon black.
Claim 6
Dependent Claim
20 words
The recording material of claim 1 wherein the semiconductive resin layer comprises a thermoplastic or thermosetting resin and carbon black.
Claim 7
Dependent Claim
25 words
The recording material of claim 1 wherein the semiconductive resin layer comprises a thermoplastic or thermosetting resin and carbon black and a filler dispersed therein.
Claim 8
Dependent Claim
35 words
The recording material of claim 1 wherein the semiconductive resin layer comprises a thermoplastic or thermosetting resin and dispersed therein, a coloring substance other than carbon black and a conductivity-imparting agent other than carbon black.
Claim 9
Dependent Claim
37 words
The recording material of claim 1 wherein the semiconductive resin layer comprises a thermoplastic or thermosetting resin and dispersed therein, a coloring substance other than carbon black, a conductivity-imparting agent other than carbon black, and a filler.
Claim 10
Dependent Claim
18 words
The recording material of claim 1 wherein the metal powder is in a microspherical, dendritic or micro-lumpy form.
Claim 11
Dependent Claim
33 words
The recording material of claim 1 wherein the metal powder is a powder of a metal selected from the group consisting of copper, aluminum, tin, molybdenum, silver, iron, nickel, znc and silver-coated copper.
Claim 12
Dependent Claim
34 words
The recording material of claim 1 wherein the amount of the metal powder dispersed in the resin matrix is at least 20 parts by weight per 100 parts by weight of the resin matrix.
Claim 13
Dependent Claim
34 words
The recording material of claim 1 wherein the amount of the metal powder dispersed in the resin matrix is 30 to 2,000 parts by weight per 100 parts by weight of the resin matrix.
Claim 14
Dependent Claim
22 words
The recording material of claim 1 wherein the metal-containing resin layer was a surface resistance of 10 9 to 10 14 ohms.
Claim 15
Dependent Claim
21 words
The recording material of claim 1 wherein the metal-containing resin layer has a volume resistance of 1 to 10 4 ohms-cm.
Claim 16
Dependent Claim
25 words
The recording material of claim 1 wherein the conductive layer comprises a thermoplastic or thermosetting resin and dispersed therein, carbon black or a metal powder.
Claim 17
Dependent Claim
28 words
The recording material of claim 1 wherein the conductive layer comprises a thermoplastic or thermosetting resin and dispersed therein, carbon black or a metal powder and a filler.
Claim 18
Dependent Claim
15 words
The recording material of claim 1 wherein the conductive layer is a vacuum-deposited metal layer.
Claim 19
Dependent Claim
20 words
The recording material of claim 1 wherein the metal powder has an average particle diameter of 0.5 to 10 microns.
Claim 20
Dependent Claim
21 words
The recording material of claim 11 wherein the metal powder has a specific resistance of not more than 2×10 -5 ohm-cm.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-30 | 1983-01-29 | 1983-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-30 | 1987-01-29 | 1987-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-30 | 1991-01-29 | 1991-07-31 | $7700.00 | Window Closed / Lapsed |