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Patent US4395362A successfully refreshed from Google Patents.
US4395362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroconductive resin composite material for molding
Assignee: Kureha Corp
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Filing: 1981-08-26
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Granted: 1983-07-26
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Expires: 2001-08-26
Abstract
Abstract An electroconductive resin composite material for molding having excellent mechanical strength and electrical properties. The resin comprises 100 parts by weight of polypropylene, from 10 to 50 parts by weight of a modified polypropylene obtained either by chemically modifying polypropylene with an organic unsaturated carboxylic acid or by copolymerizing propylene and the organic unsaturated carboxylic acid, from 5 to 65 parts by weight of carbon fiber having a diameter of 5 to 20 micrometers, the ratio of length to diameter of the fiber being not less than 10, and from 5 to 65 parts by weight of electroconductive carbon black, the specific surface area being at least 800 m2/g.
Inventors
- 👤 Hiroaki Satoh
- 👤 Masaru Hiruta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:35
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/20; H01B1/24; C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08K7/00; C08K7/02; C08K7/04; C08K7/06; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08L23/14; C08L23/26; C08L23/30; C08L51/00; C08L51/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
134 words
A resin composite material consisting essentially of 100 parts by weight of polypropylene, from 10 to 50 parts by weight of a modified polypropylene, said modified polypropylene being polypropylene chemically modified with an organic unsaturated carboxylic acid of 3 to 10 carbon atoms or a copolymer of propylene and an organic unsaturated carboxylic acid of 3 to 10 carbon atoms, said modified polypropylene containing 0.5 to 8.0 mol% of said organic unsaturated carboxylic acid as carboxylic acid units, from 5 to 65 parts by weight of carbon fiber having a diameter of from 5 to 20 micrometers and a ratio of length to diameter of not less than 10 and from 5 to 65 parts by weight of electroconductive carbon black having a specific surface area of not less than 800 m 2 /g.
Claim 2
Dependent Claim
134 words
A resin composite material consisting essentially of 100 parts by weight of polypropylene, from 10 to 50 parts by weight of a modified polypropylene, said modified polypropylene being polypropylene chemically modified with an organic unsaturated carboxylic acid of 3 to 10 carbon atoms or a copolymer of propylene and an organic unsaturated carboxylic acid of 3 to 10 carbon atoms, said modified polypropylene containing 0.5 to 8.0 mol% of said organic unsaturated carboxylic acid as carboxylic acid units, from 5 to 65 parts by weight of carbon fiber having a diameter of from 5 to 20 micrometers and a ratio of length to diameter of not less than 10 and from 5 to 65 parts by weight of electroconductive carbon black having a specific surface area of not less than 800 m 2 /g.
Claim 3
Dependent Claim
30 words
The resin composite material of claim 1, wherein the total amount of polypropylene and modified polypropylene is more than 60% by weight of the total amount of said composite material.
Claim 4
Dependent Claim
17 words
The resin composite of claim 1 containing from 10 to 40 parts by weight of carbon fiber.
Claim 5
Dependent Claim
18 words
The resin composite of claim 1 containing from 10 to 40 parts by weight of electroconductive carbon black.
Claim 6
Dependent Claim
29 words
The resin composite material of claim 1 wherein the carboxyclic acid is selected from the group consisting of maleic, acrylic methacrylic, endobicyclo [2,2,1]5-heptene-2,3-dicarboxylic and itaconic acids and their anhydrides.
Claim 7
Dependent Claim
13 words
The resin composite of claim 5 wherein the carboxylic acid is maleic acid.
Claim 8
Dependent Claim
26 words
The resin composite of claim 1 wherein the modified polypropylene contains from 1 to 5 mol% of said organic unsaturated carboxylic acid as carboxylic acid units.
References Cited (Backward Citations)
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Cited
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US3902532A
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US4002595A
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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) | 1986-07-25 | 1987-01-24 | 1987-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-25 | 1991-01-24 | 1991-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-25 | 1995-01-24 | 1995-07-26 | $7700.00 | Window Closed / Lapsed |