US4968560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber-reinforced epoxide resins
Assignee: Evonik Operations GmbH
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Filing: 1989-06-08
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Granted: 1990-11-06
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Expires: 2009-06-08
Abstract
Abstract Epoxide resins which are reinforced with aramid fibers and in which the adhesion between fibers and resin is improved by means of a pretreatment of the fibers with organosilanes.
Inventors
- 👤 Ulrike Lechner
- 👤 Albrecht Feldsmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:32
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; C08J5/06; C08J2363/00; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2938; Y10T428/2962
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
99 words
Aramid fibers for reinforcing epoxide resins which have been pretreated on the surface with an organosilane of the general formula ##STR8## in which R 1 is halogen or an organic group selected from the group consisting of alkyl, alkenyl, amino, mercapto, acetoxy, epoxy, methacryloxy and N'-acyl urea which is bound to the silicon atom by an alkyl chain which has 2 to 6 carbon atoms, R is an alkyl group which contains 1 to 4 carbon atoms and x signifies a number from 1 to 6, the organosilane content being 0.01 to 10% by weight relative to the fibers.
Claim 2
Dependent Claim
99 words
Aramid fibers for reinforcing epoxide resins which have been pretreated on the surface with an organosilane of the general formula ##STR8## in which R 1 is halogen or an organic group selected from the group consisting of alkyl, alkenyl, amino, mercapto, acetoxy, epoxy, methacryloxy and N'-acyl urea which is bound to the silicon atom by an alkyl chain which has 2 to 6 carbon atoms, R is an alkyl group which contains 1 to 4 carbon atoms and x signifies a number from 1 to 6, the organosilane content being 0.01 to 10% by weight relative to the fibers.
Claim 3
Dependent Claim
77 words
Aramid fibers as set forth in claim 1 in which R 1 is selected from chlorine, methyl, ethyl with n=2, vinylene, 2-propenyl, cyclohexenyl, N'-acyl urea of the formula: ##STR9## where R 2 is straight-chain or branched-chain alkyl containing 1 to 6 carbon atoms, R 3 is hydrogen, straight-chain or branched chain alkyl containing 1 to 6 carbon atoms, (2-methoxy)ethyl, aryl or ##STR10## where y=1, 2 or 3 and D is --CH 2 -- or NR 2 .
References Cited (Backward Citations)
US4309478A
Cited
US4842934A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-11-05 | 1994-05-07 | 1994-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-05 | 1998-05-07 | 1998-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-05 | 2002-05-07 | 2002-11-06 | $7700.00 | Window Closed / Lapsed |