US4746574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antistatic sheeting
Assignee: Asahi Kasei Polyflex Ltd
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Filing: 1987-02-25
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Granted: 1988-05-24
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Expires: 2007-02-25
Abstract
Abstract An antistatic sheet material comprises a substrate layer, an electroconductive layer, and a surface layer. The electroconductive layer is disposed on the substrate layer and contains carbon black in such a manner that the carbon black partly protrudes into the surface layer. The surface layer is a thin transparent plastic layer. The sheet material possesses decreased surface resistance and exhibits excellent antistatic properties. The sheet material permits an object held thereunder to be clearly seen therethrough and enjoys high resistance to surface friction and never deteriorates any object which is in contact therewith. Thus, the sheet material of this invention is used advantageously as containers for objects which by their nature are vulnerable to electrostatic damage.
Inventors
- 👤 Eiji Hattori
- 👤 Mitsuji Ebara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:42
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/18; B32B27/30; B32B27/32; H; H01; H01B; H01B1/00; H01B1/20; H01B1/24; B32B2307/00; B32B2307/20; B32B2307/202; B32B2307/21; B32B2307/30; B32B2307/306; B32B2307/31; B32B2307/40; B32B2307/412; B32B2307/50; B32B2307/514; B32B2307/518; B32B2323/00; B32B2323/04; B32B2333/00; B32B2391/00; B32B2439/00; B32B2439/40; B32B2439/46; B32B2439/62; B65; B65D; B65D2213/00; B65D2213/02; Y; Y10; Y10S; Y10S428/00; Y10S428/918; Y10S428/922; Y10T; Y10T428/00; Y10T428/24; Y10T428/24777; Y10T428/24942; Y10T428/31; Y10T428/31504; Y10T428/31678; Y10T428/31681
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
72 words
An antistatic sheet material consisting of: a substrate layer comprising a transparent plastic substance; an electroconductive layer disposed on one surface of said substrate layer; a surface layer comprising a transparent plastic substance disposed on said electroconductive layer to a thickness of 10 μm to 0.2 μm; and carbon black, contained in said electroconductive layer in an amount of 0.8 to 0.01 g/m 2 , which partially protrudes into said surface layer.
Claim 2
Dependent Claim
72 words
An antistatic sheet material consisting of: a substrate layer comprising a transparent plastic substance; an electroconductive layer disposed on one surface of said substrate layer; a surface layer comprising a transparent plastic substance disposed on said electroconductive layer to a thickness of 10 μm to 0.2 μm; and carbon black, contained in said electroconductive layer in an amount of 0.8 to 0.01 g/m 2 , which partially protrudes into said surface layer.
Claim 3
Dependent Claim
18 words
The sheet material according to claim 1, wherein said substrate layer is a transparent and flexible plastic film.
Claim 4
Dependent Claim
19 words
The sheet material according to claim 2, wherein said flexible plastic film is a biaxially stretched heat-resistant plastic film.
Claim 5
Dependent Claim
21 words
The sheet material according to claim 1, wherein said substrate layer has a heat-sealing layer disposed on the other surface thereof.
Claim 6
Dependent Claim
16 words
The sheet material according to claim 1, wherein said substrate layer is a rigid thermoplastic sheet.
Claim 7
Dependent Claim
23 words
The sheet material according to claim 1, wherein said electroconductive layer has a thickness in the range of 5 μm to 0.01 μm.
Claim 8
Dependent Claim
42 words
The sheet material according to claim 1, wherein said electroconductive layer is formed by the application of a coating material having carbon black contained in an amount of not less than 8% by weight in an involatile component of said coating material.
Claim 9
Dependent Claim
17 words
The sheet material according to claim 1, wherein said surface layer is formed of an acrylic resin.
Claim 10
Dependent Claim
16 words
The sheet material according to claim 1, wherein said surface layer contains a polyethylene type wax.
Claim 11
Dependent Claim
35 words
The sheet material according to claim 1, wherein said electroconductive layer has continuous lines of increased thickness or increased carbon black concentration, arranged in the pattern of a net or extending parallel to one another.
Claim 12
Dependent Claim
33 words
A container in the form of bag, box, cylinder, magazine, or tray, formed of the sheet material set forth in claim 1 wherein the surface layer forms the inner surface of said container.
Claim 13
Dependent Claim
31 words
A container in the form of bag, box, cylinder, magazine, or tray, formed of the sheet material of claim 2, wherein the surface layer forms the inner surface of said container.
Claim 14
Dependent Claim
31 words
A container in the form of bag, box, cylinder, magazine, or tray, formed of the sheet material of claim 3, wherein the surface layer forms the inner surface of said container.
Claim 15
Dependent Claim
31 words
A container in the form of bag, box, cylinder, magazine, or tray, formed of the sheet material of claim 4, wherein the surface layer forms the inner surface of said container.
Claim 16
Dependent Claim
31 words
A container in the form of bag, box, cylinder, magazine, or tray, formed of the sheet material of claim 5, wherein the surface layer forms the inner surface of said container.
Claim 17
Dependent Claim
31 words
A container in the form of bag, box, cylinder, magazine, or tray, formed of the sheet material of claim 6, wherein the surface layer forms the inner surface of said container.
Claim 18
Dependent Claim
31 words
A container in the form of bag, box, cylinder, magazine, or tray, formed of the sheet material of claim 7, wherein the surface layer forms the inner surface of said container.
Claim 19
Dependent Claim
31 words
A container in the form of bag, box, cylinder, magazine, or tray, formed of the sheet material of claim 8, wherein the surface layer forms the inner surface of said container.
Claim 20
Dependent Claim
31 words
A container in the form of bag, box, cylinder, magazine, or tray, formed of the sheet material of claim 9, wherein the surface layer forms the inner surface of said container.
Claim 21
Dependent Claim
31 words
A container in the form of bag, box, cylinder, magazine, or tray, formed of the sheet material of claim 10, wherein the surface layer forms the inner surface of said container.
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) | 1991-05-24 | 1991-11-23 | 1992-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-24 | 1995-11-23 | 1996-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-24 | 1999-11-23 | 2000-05-24 | $7700.00 | Window Closed / Lapsed |