US4795676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic recording material
Assignee: New Oji Paper Co Ltd
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Filing: 1986-12-09
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Granted: 1989-01-03
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Expires: 2006-12-09
Abstract
Abstract In an electrostatic recording material being composed of a multi-layered sheet support having an electroconductive layer and a dielectric layer formed successively thereon, the number of projections having a height of 10 mu m or more from the flat surface is limited to a maximum of 50 per 0.1 m2, so that the material has excellent properties and can produce prints of very high quality.
Inventors
- 👤 Toshio Maekawa
- 👤 Hiroshige Yamauchi
- 👤 Takashi Toyota
- 👤 Akeo Sawayama
- 👤 Masaaki Yamanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:22
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/10; G03G5/02; G03G5/0202; G03G5/0217; Y; Y10; Y10S; Y10S428/00; Y10S428/908; Y10S428/91; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31971; Y10T428/31975; Y10T428/31978; Y10T428/31982
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
133 words
An electrostatic recording material which is composed of a support that is formed of a multi-layered sheet of synthetic paper and which has an electroconductive layer an a dielectric layer formed successively thereon, said support being a multi-layered film formed from a base layer of a stretched film, paper-like layers which are made from a thermoplastic resin film containing 8 to 65% by weight of inorganic fine powder formed on both sides of said base layer and surface layers which are formed from a thermoplastic resin film containing 0-3 wt % of inorganic fine powder and formed on each of said paper-like layers, said support containing no more than 50 elevations per 0.1 m 2 that project by a height of 10 μm or more from the flat side of said surface layer.
Claim 2
Dependent Claim
133 words
An electrostatic recording material which is composed of a support that is formed of a multi-layered sheet of synthetic paper and which has an electroconductive layer an a dielectric layer formed successively thereon, said support being a multi-layered film formed from a base layer of a stretched film, paper-like layers which are made from a thermoplastic resin film containing 8 to 65% by weight of inorganic fine powder formed on both sides of said base layer and surface layers which are formed from a thermoplastic resin film containing 0-3 wt % of inorganic fine powder and formed on each of said paper-like layers, said support containing no more than 50 elevations per 0.1 m 2 that project by a height of 10 μm or more from the flat side of said surface layer.
Claim 3
Dependent Claim
69 words
The electrostatic recording material according to claim 1 wherein said paper-like layer is formed of a uniaxially stretched thermoplastic resin film that has the following composition: (a) 35-92 wt % of polypropylene; (b) 0-30 wt % of at least one resin selected from the group consisting of polystyrene, high-density polyethylene, medium-density polyethylene, low-density polyethylene, and an ethylene-vinyl acetate copolymer; and (c) 8-65 wt % of an inorganic fine powder.
Claim 4
Dependent Claim
58 words
The electrostatic recording material according to claim 1 wherein said surface layer is formed of a uniaxially stretched thermoplastic resin film that has the following composition: (a) 40-60 wt % of polypropylene; (b) 60-40 wt % of high-density polyethylene; and (c) 0-3 wt % of an inorganic fine powder having a particle size of 3 μm or less.
Claim 5
Dependent Claim
28 words
The electrostatic recording material according to claim 1 wherein the surface layer is formed on only the paper-like layer provided on the obverse surface of said base layer.
Claim 6
Dependent Claim
64 words
The electrostatic recording material according to claim 1 wherein the base layer is formed of a biaxially stretched film having the following composition: (a) 50-95 wt % of polypropylene; (b) 0-30 wt % of at least one resin selected from the group consisting of high-density polyethylene, medium-density polyethylene, low-density polyethylene and an ethylene-vinyl acetate copolymer; and (c) 50-5 wt % of inorganic fine powder.
Claim 7
Dependent Claim
22 words
The electrostatic recording material according to claim 1 wherein the film serving as the surface layer has a thickness of 1-10 μm.
Claim 8
Dependent Claim
35 words
An electrostatic recording material according to claim 1 wherein the surface layer has a surface smoothness of 3,000 seconds or less in terms of Bekk smoothness as measured by the method described in JIS P-8119.
Claim 9
Dependent Claim
64 words
The electrostatic recording material according to claim 4 wherein the base layer is formed of a biaxially stretched film having the following composition (a) 50-95 wt % of polypropylene; (b) 0-30 wt % of at least one resin selected from the group consisting of high-density polyethylene, medium-density polyethylene, low-density polyethylene and an ethylene-vinyl acetate copolymer; and (c) 50-5 wt % of inorganic fine powder.
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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) | 1992-01-03 | 1992-07-04 | 1993-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-03 | 1996-07-04 | 1997-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-03 | 2000-07-04 | 2001-01-03 | $7700.00 | Window Closed / Lapsed |