US5094794A
Expired / Lapsed
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High performance aramid matrix composites
Assignee: EIDP Inc
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Filing: 1991-05-01
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Granted: 1992-03-10
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Expires: 2011-05-01
Abstract
Abstract Thermoprocessible aramid matrix polymer based composites have high flex and short beam shear strengths and low moisture uptake.
Inventors
- 👤 Robert B. Croman
- 👤 Hamid M. Ghorashi
- 👤 Gurdial Singh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:44
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/36; C08K; C08K7/00; C08K7/02; Y; Y10; Y10S; Y10S264/00; Y10S264/29; Y10S428/00; Y10S428/902; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2933; Y10T428/2938; Y10T428/2964; Y10T428/2967; Y10T428/2969; Y10T428/31504; Y10T428/31725; Y10T428/31728
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
87 words
A method for preparing aramid fiber coated with a polymer consisting essentially of a copolyamide of the following units: ##STR4## where n is 4 or 5; X is from 0.01 to 0.50, preferably from 0.03 to 0.30, and Ar is a radical selected from 3,4'-oxydiphenylene, 4,4'-oxydiphenylene, 1,3-phenylene, 1-methyl-2,4-phenylene, and mixtures of such radicals with each other or with up to equimolar amounts of 1,4-phenylene radicals, comprising dissolving the copolyamide in a solvent, passing the fiber through the solution to pick up a coating and drying the coating.
Claim 2
Independent Claim
87 words
A method for preparing aramid fiber coated with a polymer consisting essentially of a copolyamide of the following units: ##STR4## where n is 4 or 5; X is from 0.01 to 0.50, preferably from 0.03 to 0.30, and Ar is a radical selected from 3,4'-oxydiphenylene, 4,4'-oxydiphenylene, 1,3-phenylene, 1-methyl-2,4-phenylene, and mixtures of such radicals with each other or with up to equimolar amounts of 1,4-phenylene radicals, comprising dissolving the copolyamide in a solvent, passing the fiber through the solution to pick up a coating and drying the coating.
Claim 3
Dependent Claim
17 words
A method according to claim 1 in which Ar is 3,4'-oxydiphenylene and the aliphatic unit is ##STR5##
Claim 4
Independent Claim
76 words
A method for preparing an aramid fiber coated with a polymer consisting essentially of a copolyamide of the following units: ##STR6## where n is 4 or 5; X is from 0.01 to 0.50, preferably from 0.03 to 0.30, and Ar is a radical selected from 3,4'-oxydiphenylene, 4,4'-oxydiphenylene, 1,3-phenylene, 1-methyl-2,4-phenylene, and mixtures of such radicals with each other or with up to equimolar amounts of 1,4-phenylene radicals comprising melting the copolyamide and extruding it over aramid fiber.
Claim 5
Independent Claim
76 words
A method for preparing an aramid fiber coated with a polymer consisting essentially of a copolyamide of the following units: ##STR6## where n is 4 or 5; X is from 0.01 to 0.50, preferably from 0.03 to 0.30, and Ar is a radical selected from 3,4'-oxydiphenylene, 4,4'-oxydiphenylene, 1,3-phenylene, 1-methyl-2,4-phenylene, and mixtures of such radicals with each other or with up to equimolar amounts of 1,4-phenylene radicals comprising melting the copolyamide and extruding it over aramid fiber.
Claim 6
Dependent Claim
17 words
A method according to claim 3 in which Ar is 3,4'-oxydiphenylene and the aliphatic unit is ##STR7##
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1995-03-10 | 1995-09-09 | 1996-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-10 | 1999-09-09 | 2000-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-10 | 2003-09-09 | 2004-03-10 | $7700.00 | Window Closed / Lapsed |