US4530779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conductive synthetic resin molding material
Assignee: Toshiba Chemical Products Co Ltd
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Filing: 1983-10-11
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Granted: 1985-07-23
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Expires: 2003-10-11
Abstract
Abstract A conductive synthetic resin composition, which is suited for manufacturing a molded product having an excellent electromagnetic shielding effect, and comprises master pellets consisting of a cylindrical synthetic resin layer and a bundle of a number of strands of fibrous conductive filler filled inside said synthetic resin layer in a longitudinal direction thereof, the master pellets being cut in the form of pellets; and natural pellets consisting of a synthetic resin.
Inventors
- 👤 Toshio Mayama
- 👤 Hidehiro Iwase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:37
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/009; B; B29; B29B; B29B9/00; B29B9/12; B29B9/14; H01; H01B; H01B1/00; H01B1/20; H01B1/22; H01B1/24
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
57 words
A conductive synthetic resin molding material comprising: master pellets consisting of a cylindrical synthetic resin layer and a bundle of a number of strands of fibrous conductive filler filled inside said synthetic resin layer in a longitudinal direction thereof, the master pellets being cut in the form of pellets; and natural pellets consisting of a synthetic resin.
Claim 2
Dependent Claim
57 words
A conductive synthetic resin molding material comprising: master pellets consisting of a cylindrical synthetic resin layer and a bundle of a number of strands of fibrous conductive filler filled inside said synthetic resin layer in a longitudinal direction thereof, the master pellets being cut in the form of pellets; and natural pellets consisting of a synthetic resin.
Claim 3
Dependent Claim
15 words
A molding material according to claim 1, wherein the conductive filler is a metal fiber.
Claim 4
Dependent Claim
23 words
A molding material according to claim 1, wherein the conductive filler is a carbon fiber or carbon fiber coated with a metal layer.
Claim 5
Dependent Claim
20 words
A molding material according to claim 1, wherein the conductive filler is a glass fiber coated with a metal layer.
Claim 6
Dependent Claim
16 words
A molding material according to claim 1, wherein the conductive filler is coated with a metal.
Claim 7
Dependent Claim
27 words
A molding material according to claim 1, wherein a bundle of the conductive filler has a coating layer of a titanate coupling agent on a surface thereof.
Claim 8
Dependent Claim
44 words
A molding material according to claim 6, wherein the coating layer of the titanate coupling agent consists of a member selected from the group consisting of isopropyltridodecylbenzene sulfonyl titanate, isopropyltris(dioctylpyrophosphate) titanate, bis(dioctylpyrophosphate) oxyacetate titanate, bis(dioctylpyrophosphate) ethylene titanate, isopropyltricumylphenyl titanate, isoprophl(N-aminoethyl-aminoethyl) titanate, and isopropyltri(dioctylphosphate) titanate.
Claim 9
Dependent Claim
21 words
A molding material according to claim 6, wherein the bundle of the conductive filler consists of a plurality of smaller bundles.
Claim 10
Dependent Claim
31 words
A molding material according to claim 1, wherein the mixing ratio of the master pellets to the natural pellets is in the range of from 1:1 to 1:20, based on weight.
Claim 11
Dependent Claim
29 words
A molding material according to claim 1, wherein a resin of the cylindrical synthetic resin layer and the synthetic resin of the natural pellets are of the same type.
Claim 12
Dependent Claim
28 words
A molding material according to claim 1, wherein a resin of the cylindrical synthetic resin layer and the synthetic resin of the natural pellets produce a polymer blend.
Claim 13
Dependent Claim
14 words
A molding material according to claim 1, wherein the master pellets are shaped flat.
Claim 14
Independent Claim
40 words
A method of continueously forming master pellets, which comprises the steps of continueously passing a bundle of fibrous conductive fillers through an extruder for coating a synthetic resin layer around the bundle and cutting the bundle coated with the resin.
Claim 15
Independent Claim
40 words
A method of continueously forming master pellets, which comprises the steps of continueously passing a bundle of fibrous conductive fillers through an extruder for coating a synthetic resin layer around the bundle and cutting the bundle coated with the resin.
Claim 16
Dependent Claim
22 words
A method according to claim 13, wherein said bundle is precoated with a titanate coupling agent before being passed through the extruder.
Claim 17
Dependent Claim
41 words
A method according to claim 13, wherein a step of pressing the bundle coated with the resin is included after the step of passing the bundle through the extruder and before the step of cutting the bundle coated with the resin.
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) | 1988-07-22 | 1989-01-21 | 1989-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-22 | 1993-01-21 | 1993-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-22 | 1997-01-21 | 1997-07-23 | $7700.00 | Window Closed / Lapsed |