US4049613A
Expired / Lapsed
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Polyetherimide composites
Assignee: General Electric Co
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Filing: 1976-09-07
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Granted: 1977-09-20
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Expires: 1996-09-07
Abstract
Abstract Carbon fiber-polyetherimide matrix composites are provided, based on the use of polyetherimide having terminal nitro groups. The carbon fiber-polyetherimide composites have high strength, high modulus and superior solvent resistance.
Inventors
- 👤 Dwain M. White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:29
CPC Classifications
D; D01; D01F; D01F11/00; D01F11/10; D01F11/14; C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1046; C08G73/1053; C08G73/1057; C08G73/1064; C08K; C08K7/00; C08K7/02; C08K7/04; C08K7/06; Y; Y10; Y10S; Y10S260/00; Y10S260/23
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
106 words
Polyetherimie-carbon fiber composites comprising, A. from 40% to 85% by weight of carbon fiber having a tensile strength of at least 100,000 psi at 25° C., and an elastic modulus of at least 2×10 6 psi at 25° C. and, B. from 15% to 60% by weight of polyetherimide, having terminal nitro aromatic groups, consisting essentially of chemically combined units of the formula, ##STR8## where R is selected from the class consisting of, ##STR9## and (b) divalent organic radicals of the general formula, ##STR10## where X is a member selected from the class consisting of divalent radicals of the formulas, C n H 2n --, ##STR11##
Claim 2
Dependent Claim
106 words
Polyetherimie-carbon fiber composites comprising, A. from 40% to 85% by weight of carbon fiber having a tensile strength of at least 100,000 psi at 25° C., and an elastic modulus of at least 2×10 6 psi at 25° C. and, B. from 15% to 60% by weight of polyetherimide, having terminal nitro aromatic groups, consisting essentially of chemically combined units of the formula, ##STR8## where R is selected from the class consisting of, ##STR9## and (b) divalent organic radicals of the general formula, ##STR10## where X is a member selected from the class consisting of divalent radicals of the formulas, C n H 2n --, ##STR11##
Claim 3
Dependent Claim
57 words
---- . and --S--, where m is 0 or 1, y is a whole number from 1-5, and R 1 is a monovalent organo radical selecred from the class consistng of C.sub.( 1 -8) alkyl radicals, and organic radicals having from 6-20 carbon atoms, selected from the class consisting of aromatic hydrocarbon radicals and halogenated derivatives thereof.
Claim 4
Dependent Claim
57 words
---- . and --S--, where m is 0 or 1, y is a whole number from 1-5, and R 1 is a monovalent organo radical selecred from the class consistng of C.sub.( 1 -8) alkyl radicals, and organic radicals having from 6-20 carbon atoms, selected from the class consisting of aromatic hydrocarbon radicals and halogenated derivatives thereof.
Claim 5
Dependent Claim
17 words
A polyetherimide composite in accordance with claim 1, where R is ##STR12## and R 1 is ##STR13##
Claim 6
Dependent Claim
15 words
A polyetherimide composite in accordance with claim 1, where the carbon fiber is graphite fiber.
Claim 7
Independent Claim
9 words
A method for making a polyetherimide composite which comprises
Claim 8
Independent Claim
9 words
A method for making a polyetherimide composite which comprises
Claim 9
Dependent Claim
16 words
treating a carbon fiber with polyetherimide, consisting essentially of chemically combined units of the formula, ##STR14##
Claim 10
Dependent Claim
16 words
treating a carbon fiber with polyetherimide, consisting essentially of chemically combined units of the formula, ##STR14##
Claim 11
Dependent Claim
28 words
and having terminal nitro groups and 2. molding the resulting treated carbon fiber to a desired shape, where R and R 1 are as defined in claim 1.
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) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |