Patent US2841991A successfully refreshed from Google Patents.
US3947534A
Expired / Lapsed
US
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Processing of aluminum oxide fibers
Assignee: Bayer AG
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Filing: 1974-05-01
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Granted: 1976-03-30
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Expires: 1994-05-01
Abstract
Abstract In the production of aluminum oxide fibers comprising dry spinning an aluminum-containing solution to produce fiber and thereafter heat treating the fiber, the improvement which comprises applying to the fiber prior to heat treatment a solution of polyvinyl acetate in a solvent which is inert to the fiber. Advantageously the polyvinyl acetate is present in its solution in a concentration of about 0.1 to 10% by weight and is applied to the fiber in about 0.1 to 3 % by weight. The spinning solution may also contain SiO 2 and polyethylene oxide, and the polyvinyl acetate solution may also contain di-n-butyl phthalate as a plasticizer for the polyvinyl acetate. The fiber bundles are characterized by increased strength and resistance to breaking during further processing.
Inventors
- 👤 Manfred Mansmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:04
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/62227; C04B35/62231; C04B35/62236; C01; C01F; C01F7/00; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
51 words
In the production of aluminum oxide fibers comprising dry spinning an aluminum compound-containing solution or sol to produce fiber and thereafter heat treating the fiber, the improvement which comprises applying to the fiber prior to heat treatment a solution of polyvinyl acetate in a solvent which is inert to the fiber.
Claim 2
Dependent Claim
51 words
In the production of aluminum oxide fibers comprising dry spinning an aluminum compound-containing solution or sol to produce fiber and thereafter heat treating the fiber, the improvement which comprises applying to the fiber prior to heat treatment a solution of polyvinyl acetate in a solvent which is inert to the fiber.
Claim 3
Dependent Claim
37 words
The process of claim 1 wherein the polyvinyl acetate is present in its solution in a concentration of about 0.1 to 10% by weight and is applied to the fiber in about 0.1 to 3% by weight.
Claim 4
Dependent Claim
14 words
The process of claim 2 where the polyvinyl acetate solvent comprises toluene or styrene.
Claim 5
Dependent Claim
29 words
The process of claim 1 wherein the polyvinyl acetate solution also contains a plasticizer for the polyvinyl acetate in up to about 100% by weight of the polyvinyl acetate.
Claim 6
Dependent Claim
11 words
The process of claim 4 wherein the plasticizer is di-n-butyl phthalate.
Claim 7
Dependent Claim
41 words
The process of claim 5, wherein the solvent is toluene or styrene the polyvinyl acetate is present therein in a concentration of about 0.5 to 3% by weight and is applied to the fiber in about 0.3 to 1.5% by weight.
Claim 8
Dependent Claim
18 words
The process of claim 6 wherein the spinning solution or sol further contains SiO 2 and polyethylene oxide.
Claim 9
Dependent Claim
34 words
In the processing of an aluminum oxide fiber bundle, the improvement which comprises employing as said bundle a material carrying thereon about 0.1 to 3% by weight of polyvinyl acetate as a sizing agent.
Claim 10
Dependent Claim
34 words
In the processing of an aluminum oxide fiber bundle, the improvement which comprises employing as said bundle a material carrying thereon about 0.1 to 3% by weight of polyvinyl acetate as a sizing agent.
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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) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |