US4308314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric recording material
Assignee: Sekisui Chemical Co Ltd
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Filing: 1979-07-31
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Granted: 1981-12-29
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Expires: 1999-07-31
Abstract
Abstract An electric recording material comprising (A) a semiconductive resin layer comprising a resin matrix and a conductivity-imparting agent dispersed therein and having a surface resistance of more than 1 ohm to less than 105 ohms, (B) a metal-containing resin layer comprising a resin matrix and 5 to 60% by volume of a metal powder dispersed therein and having a surface resistance of 105 to 1016 ohms, said metal-containing layer being laminated to one surface of said semiconductive resin layer (A), (C) an electrically conductive covering layer having a surface resistance not exceeding 104 ohms and being lower than that of the semiconductive resin layer (A), said covering layer being laminated to the other surface of said resin layer (A), and (D) optionally, a protective covering resin layer having a higher surface resistance than that of said covering layer (C) and a thickness of not more than 10 microns, said protective covering layer being laminated to said conductive covering layer (C); and a method for electric recording using said material. The use of said material permits recording at low voltages.
Inventors
- 👤 Shiro Nakano
- 👤 Yoshiro Naito
- 👤 Shigeki Nakamura
- 👤 Tosimasa Ikena
- 👤 Kazuo Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:40
CPC Classifications
B; B41; B41N; B41N1/00; B41N1/24; B41N1/246; B41M; B41M5/00; B41M5/20; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S428/914; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893; Y10T428/24901; Y10T428/24909; Y10T428/24917; Y10T428/25; Y10T428/256; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/269; Y10T428/31
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
285 words
An electric recording material comprising (A) a semiconductive resin layer comprising a resin matrix and a conductivity-imparting agent dispersed therein and having a surface resistance of more than 1 ohm to less than 10 5 ohms and a volume resistance of not more than 10 3 ohms-cm which surface resistance and volume resistance parameters are such as to render the electric recording material effective for electric recording at voltages not more than 90 V, (B) a metal-containing resin layer comprising a resin matrix and 5 to 60% by volume of a metal powder dispersed therein and having a surface resistance of 10 5 to 10 16 ohms and a volume resistance of not more than 10 4 ohms-cm, said metal-containing layer being laminated to one surface of said semiconductive resin layer (A), said metal powder being stable and electrically conductive and having a specific resistance of not more than 2×10 -4 ohms-cm and an average particle diameter of from 0.2 to 20 microns, (C) an electrically conductive covering layer having a surface resistance not exceeding 10 4 ohms and a volume resistance of not more than 10 2 ohms-cm and being lower than that of the semiconductive resin layer (A), said covering layer being laminated to the other surface of said resin layer (A) and comprising a resin matrix and a conductivity-imparting agent dispersed therein, or a vacuum-deposited metal film or a metal foil, and (D) optionally, a protective covering resin layer having a higher surface resistance than that of said covering layer (C), a volume resistance of not less than 10 2 ohms-cm and a thickness of not more than 10 microns, said protective covering layer being laminated to said conductive covering layer (C).
Claim 2
Dependent Claim
285 words
An electric recording material comprising (A) a semiconductive resin layer comprising a resin matrix and a conductivity-imparting agent dispersed therein and having a surface resistance of more than 1 ohm to less than 10 5 ohms and a volume resistance of not more than 10 3 ohms-cm which surface resistance and volume resistance parameters are such as to render the electric recording material effective for electric recording at voltages not more than 90 V, (B) a metal-containing resin layer comprising a resin matrix and 5 to 60% by volume of a metal powder dispersed therein and having a surface resistance of 10 5 to 10 16 ohms and a volume resistance of not more than 10 4 ohms-cm, said metal-containing layer being laminated to one surface of said semiconductive resin layer (A), said metal powder being stable and electrically conductive and having a specific resistance of not more than 2×10 -4 ohms-cm and an average particle diameter of from 0.2 to 20 microns, (C) an electrically conductive covering layer having a surface resistance not exceeding 10 4 ohms and a volume resistance of not more than 10 2 ohms-cm and being lower than that of the semiconductive resin layer (A), said covering layer being laminated to the other surface of said resin layer (A) and comprising a resin matrix and a conductivity-imparting agent dispersed therein, or a vacuum-deposited metal film or a metal foil, and (D) optionally, a protective covering resin layer having a higher surface resistance than that of said covering layer (C), a volume resistance of not less than 10 2 ohms-cm and a thickness of not more than 10 microns, said protective covering layer being laminated to said conductive covering layer (C).
Claim 3
Dependent Claim
13 words
The recording material of claim 1 wherein said conductivity-imparting agent is carbon black.
Claim 4
Dependent Claim
26 words
The recording material of claim 1 wherein said semiconductive resin layer (A) has a surface resistance in the range of 10 2 to 10 5 ohms.
Claim 5
Dependent Claim
17 words
The recording material of claim 1 wherein said semiconductive resin layer (A) further comprises an inorganic filler.
Claim 6
Dependent Claim
29 words
The recording material of claim 4 wherein the amount of the inorganic filler is 10 to 1000 parts by weight per 100 parts by weight of the resin matrix.
Claim 7
Dependent Claim
26 words
The recording material of claim 1 wherein said semiconductive resin layer (A) further comprises a thermoplastic resin having a lower melting point than the resin matrix.
Claim 8
Dependent Claim
23 words
The recording material of claim 6 wherein said lower-melting thermoplastic resin has a melting point in the range of 30° to 100° C.
Claim 9
Dependent Claim
30 words
The recording material of claim 6 wherein the amount of the lower-melting thermoplastic resin is 100 to 500 parts by weight per 100 parts by weight of the resin matrix.
Claim 10
Dependent Claim
23 words
The recording material of claim 1 wherein said semiconductive resin layer (A) has a thickness in the range of 1 to 70 microns.
Claim 11
Dependent Claim
26 words
The recording material of claim 1 wherein the metal-containing resin layer (B) has a surface resistance in the range of 10 9 to 10 14 ohms.
Claim 12
Dependent Claim
23 words
The recording material of claim 1 wherein said metal-containing resin layer (B) has a thickness in the range of 5 to 7 microns.
Claim 13
Dependent Claim
16 words
The recording material of claim 1 wherein said vacuum-deposited metal film is a vacuum-deposited aluminum film.
Claim 14
Dependent Claim
34 words
The recording material of claim 1 wherein the ratio of the surface resistance of the semiconductive resin layer (A) to that of the conductive covering layer (C) is from 10:1 to 10 4 :1.
Claim 15
Dependent Claim
23 words
The recording material of claim 1 wherein said conductive covering layer (C) has a thickness in the range of 1 to 50 microns.
Claim 16
Dependent Claim
22 words
The recording material of claim 1 wherein said protective covering layer (D) comprises a resin matrix and a conductivity-imparting agent dispersed therein.
Claim 17
Dependent Claim
13 words
The recording material of claim 15 wherein said conductivity-imparting agent is carbon black.
Claim 18
Dependent Claim
21 words
The recording material of claim 1 wherein said protective covering layer (D) has a thickness of not more than 5 microns.
Claim 19
Dependent Claim
34 words
The recording material of claim 1 wherein the ratio of the surface resistance of said protective covering layer (D) to that of the said conductive covering layer (C) is 10 2 :1 or higher.
Claim 20
Dependent Claim
26 words
The recording material of claim 1 wherein said protective covering layer (D) has a surface resistance in the range of 10 2 to 10 16 .
Claim 21
Dependent Claim
34 words
The recording material of claim 1 wherein at least one of the semiconductive resin layer (A), the conductive covering resin layer (C) and optionally the protective covering resin layer (D) contains a coloring substance.
Claim 22
Dependent Claim
25 words
The recording material of claim 20 wherein the coloring substance is selected from the group consisting of carbon blacks, organic and inorganic pigments, and dyes.
Claim 23
Dependent Claim
25 words
An electric recording material according to claim 1 in which the surface resistance of the semiconductive resin layer is 10 3 to 10 4 ohms.
References Cited (Backward Citations)
US4163075A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |