Patent US4582661A successfully refreshed from Google Patents.
US4582661A
Expired / Lapsed
US
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Composition for use in electromagnetic wave shielding
Assignee: Dainichi Nippon Cables Ltd
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Filing: 1983-07-25
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Granted: 1986-04-15
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Expires: 2003-07-25
Abstract
Abstract A shielding composition has an electromagnetic wave shielding property and also an injection molding property. The composition comprises at least one kind of embedding material selected from a group consisting of plasticized vinyl chloride and acrylonitrile-butadiene-styrene resin, and copper or copper alloy fiber having a diameter of 1-100 μm and a length of 0.5-10 mm embedded in said embedding material. The amount of the fibers is 30-70% by weight of the total composition.
Inventors
- 👤 Hirotaka Ito
- 👤 Akio Kusui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:28
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/18; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/009; C; C08; C08K; C08K3/00; C08K3/02; C08K3/08; C08K7/00; C08K7/02; C08K7/04; C08K7/06; C08L; C08L55/00; C08L55/02; H01B1/00; H01B1/20; H01B1/22; H02; H02G; H02G15/00; H02G15/08; H02G15/10; H02G15/103; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/2481; Y10T428/24818
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
105 words
An electromagnetic wave shielding composition suitable for press forming or injection molding purposes, comprising an embedding material selected from a group consisting of plasticized vinyl chloride resin and acrylonitrile-butadiene-styrene resin, and copper or copper alloy fibers embedded in said embedding material, said fibers having a diameter of 1-100 μm and a length of 0.5-10 mm, wherein the amount of the fibers is 30-70% by weight of said composition, said composition having a shielding effect of at least 70 (dB) in a frequency range of about 30 MHz to about 1000 MHz and a volume resistivity in the range of about 0.005 to about 0.5 Ωcm.
Claim 2
Dependent Claim
105 words
An electromagnetic wave shielding composition suitable for press forming or injection molding purposes, comprising an embedding material selected from a group consisting of plasticized vinyl chloride resin and acrylonitrile-butadiene-styrene resin, and copper or copper alloy fibers embedded in said embedding material, said fibers having a diameter of 1-100 μm and a length of 0.5-10 mm, wherein the amount of the fibers is 30-70% by weight of said composition, said composition having a shielding effect of at least 70 (dB) in a frequency range of about 30 MHz to about 1000 MHz and a volume resistivity in the range of about 0.005 to about 0.5 Ωcm.
Claim 3
Dependent Claim
21 words
The composition according to claim 1, having a viscosity in the range of 200-2,000 m-g at a temperature of 180° C.
Claim 4
Dependent Claim
52 words
The composition according to claim 1, wherein said plasticized vinyl chloride comprises of vinyl chloride copolymer and a plasticizer, said vinyl chloride copolymer being at least 50% by weight in vinyl chloride content and wherein said vinyl chloride copolyer has a mean degree of polymerization within the range of 400 to 1,200.
Claim 5
Dependent Claim
45 words
The composition according to claim 3, wherein said vinyl chloride copolymer is a copolymer of vinyl chloride and at least one kind of monomers, said monomers being capable of effecting radical polymerization with vinyl chloride, wherein said vinyl chloride is 80-99.5% by weight in content.
Claim 6
Dependent Claim
18 words
The composition according to claim 1, wherein said copper or copper in said copper alloy is pure copper.
Claim 7
Dependent Claim
41 words
The composition according to claim 1, wherein said copper alloy consists essentially of copper and zinc, and wherein the copper ranges from 60:95% by weight of the copper alloy and the zinc ranges from 40:5% by weight of the copper alloy.
Claim 8
Independent Claim
133 words
A method of shielding an electromagnetically radiating device against radiation leaks, comprising the following steps: (a) preparing, by mixing, an electromagnetic wave shielding composition comprising an embedding material selected from a group consisting of plasticized vinyl chloride resin and acrylontrile-butadiene-styrene resin, and copper or copper alloy fibers embedded in said embedding material, said fibers having a diameter of 1-100 μm and a length of 0.5-10 mm, wherein the amount of the fiber is 30-70% by weight of said composition, and (b) injection molding the so prepared composition onto said radiating device for preventing said radiation leaks, said composition having a shielding effect of at least 70 (dB) in a frequency range of about 30 MHz to about 1000 MHz and a volume resistivity in the range of about 0.005 to about 0.5 Ωcm.
Claim 9
Independent Claim
133 words
A method of shielding an electromagnetically radiating device against radiation leaks, comprising the following steps: (a) preparing, by mixing, an electromagnetic wave shielding composition comprising an embedding material selected from a group consisting of plasticized vinyl chloride resin and acrylontrile-butadiene-styrene resin, and copper or copper alloy fibers embedded in said embedding material, said fibers having a diameter of 1-100 μm and a length of 0.5-10 mm, wherein the amount of the fiber is 30-70% by weight of said composition, and (b) injection molding the so prepared composition onto said radiating device for preventing said radiation leaks, said composition having a shielding effect of at least 70 (dB) in a frequency range of about 30 MHz to about 1000 MHz and a volume resistivity in the range of about 0.005 to about 0.5 Ωcm.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-04-14 | 1989-10-14 | 1990-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-14 | 1993-10-14 | 1994-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-14 | 1997-10-14 | 1998-04-15 | $7700.00 | Window Closed / Lapsed |