Patent US4882227A successfully refreshed from Google Patents.
US4882227A
Expired / Lapsed
US
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Conductive resin composition and molded product using the same
Assignee: Kyocera Chemical Corp
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Filing: 1988-03-09
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Granted: 1989-11-21
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Expires: 2008-03-09
Abstract
Abstract There is provided an electric conductive resin composition formed into a pellet, which includes an electric conductive filler comprising electric conductive fibers and a low-melting point metal, and being coated on the surface thereof with a thermoplastic resin. Flux and/or a phosphorus-based antioxidant may be added to the filler. There is also provided an electromagnetic wave shielding molded product prepared by using the electric conductive resin composition mentioned above, wherein the electric conductive fibers dispersed within the molded product are fixed each other through the low-melting point metal.
Inventors
- 👤 Hidehiro Iwase
- 👤 Keiichi Habata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:58
CPC Classifications
H; H01; H01B; H01B1/00; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/009; B; B29; B29B; B29B11/00; B29B11/14; B29B11/16; B29B9/00; B29B9/12; B29B9/14; D; D04; D04H; D04H1/00; D04H1/40; D04H1/42; G; G21; G21F; G21F1/00; G21F1/12; G21F1/125; H01B1/20; H01B1/22; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T428/2907; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2942; Y10T428/2944; Y10T428/2951; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
64 words
A pelletized conductive resin composition comprising a thermoplastic resin layer formed on the surface of a conductive filler comprising conductive fibers and a low-melting point metal having a melting point higher than that of the thermoplastic resin and lower than the molding temperature of the conductive resin composition, and an effective amount of a phosphorus-based antioxidant to improve the wettability of the conductive fibers.
Claim 2
Dependent Claim
64 words
A pelletized conductive resin composition comprising a thermoplastic resin layer formed on the surface of a conductive filler comprising conductive fibers and a low-melting point metal having a melting point higher than that of the thermoplastic resin and lower than the molding temperature of the conductive resin composition, and an effective amount of a phosphorus-based antioxidant to improve the wettability of the conductive fibers.
Claim 3
Dependent Claim
51 words
A composition according to claim 1, wherein a content of the conductive fibers is 0.5 to 80 wt% with respect to a total weight of the conductive resin composition, and a content of the low-melting point metal is 5 to 30 wt% with respect to the content of the conductive fibers.
Claim 4
Dependent Claim
13 words
A composition according to claim 1, wherein the conductive fibers comprise metal fibers.
Claim 5
Dependent Claim
38 words
A composition according to claim 3, wherein the metal fibers are at least one material selected from the group consisting of a copper fiber, a stainless steel fiber, a brass fiber, an aluminum fiber, and a nickel fiber.
Claim 6
Dependent Claim
13 words
A composition according to claim 3, wherein the metal fibers comprise copper fibers.
Claim 7
Dependent Claim
20 words
A composition according to claim 1, wherein the conductive fibers comprise organic or inorganic fibers covered with a metal layer.
Claim 8
Dependent Claim
25 words
A composition according to claim 6, wherein the metal layer is made of a material selected from the group consisting of copper, aluminum and nickel.
Claim 9
Dependent Claim
24 words
A composition according to claim 1, wherein each of the conductive fibers has a diameter falling within a range of 5 to 100 μm.
Claim 10
Dependent Claim
16 words
A composition according to claim 8, wherein 100 to 10,000 conductive fibers are contained per pellet.
Claim 11
Dependent Claim
27 words
A composition according to claim 1, wherein the low-melting point metal is at least one metal selected from the group consisting of tin (Sn) and tin-zinc (Sn-Pb).
Claim 12
Dependent Claim
13 words
A composition according to claim 1, wherein the low-melting point metal is fibrous.
Claim 13
Dependent Claim
13 words
A composition according to claim 1, wherein the low-melting point metal is granular.
Claim 14
Dependent Claim
22 words
A composition according to claim 1, wherein the low-melting point metal covers at least part of a surface of the conductive fibers.
Claim 15
Dependent Claim
10 words
A composition according to claim 1, further comprising a flux.
Claim 16
Dependent Claim
26 words
A composition according to claim 14, wherein a content of the flux is 0.1 to 5 wt% with respect to a content of the low-melting metal.
Claim 17
Dependent Claim
14 words
A composition according to claim 14, wherein the flux is an organic acid flux.
Claim 18
Dependent Claim
30 words
A composition according to claim 16, wherein the organic acid flux is an organic acid selected from the group consisting of stearic acid, lactic acid, oleic acid, and glutamic acid.
Claim 19
Dependent Claim
13 words
A composition according to claim 14, wherein the flux is a resin flux.
Claim 20
Dependent Claim
27 words
A composition according to claim 18, wherein the resin flux is a resin selected from the group consisting of rosin and synthetic rosin having a reactive group.
Claim 21
Dependent Claim
27 words
A composition according to claim 1, wherein the content of the phosphorus-based antioxidant is 0.1 to 5 wt% with respect to the content of the thermoplastic resin.
Claim 22
Dependent Claim
17 words
A composition according to claim 1, wherein the phosphorus-based antioxidant is mixed in the thermoplastic resin layer.
Claim 23
Dependent Claim
41 words
A composition according to claim 1, wherein the thermoplastic resin is a resin selected from the group consisting of polypropylene resin, polyethylene resin, polystyrene resin, acrylonitrile-butadiene-styrene resin, denatured polyphenylene oxide resin, polybutylene terephthalate resin, polycarbonate resin, polyamide resin, and polyetherimide resin.
Claim 24
Dependent Claim
25 words
A conductive resin composition comprising master pellets consisting of a mixture of a conductive resin composition as defined in claim 1, and thermoplastic resin pellets.
Claim 25
Dependent Claim
25 words
A conductive resin composition comprising master pellets consisting of a mixture of a conductive resin composition as defined in claim 14, and thermoplastic resin pellets.
Claim 26
Dependent Claim
21 words
A conductive resin composition according to claim 1, wherein the thermoplastic resin is present substantially only in said thermoplastic resin layer.
Claim 27
Dependent Claim
21 words
A conductive resin composition according to claim 14, wherein the thermoplastic resin is present substantially only in said thermoplastic resin layer.
Claim 28
Dependent Claim
29 words
An electromagnetic wave shielding molded product prepared by molding the conductive resin composition of claim 1 at a temperature higher than the melting point of the low-melting point metal.
Claim 29
Dependent Claim
29 words
An electromagnetic wave shielding molded product prepared by molding the conductive resin composition of claim 14 at a temperature higher than the melting point of the low-melting point metal.
Claim 30
Dependent Claim
29 words
An electromagnetic wave shielding molded product prepared by molding the conductive resin composition of claim 23 at a temperature higher than the melting point of the low-melting point metal.
Claim 31
Dependent Claim
29 words
An electromagnetic wave shielding molded product prepared by molding the conductive resin composition of claim 24 at a temperature higher than the melting point of the low-melting point metal.
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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) | 1992-11-20 | 1993-05-22 | 1993-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-20 | 1997-05-22 | 1997-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-20 | 2001-05-22 | 2001-11-21 | $7700.00 | Window Closed / Lapsed |