US4416924A
Expired / Lapsed
US
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Polycarbonate sizing finish and method of application thereof
Assignee: SUBJECT TO AGREEMENT RECITED SEE DOCUMENT FOR DETAILS
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Filing: 1982-09-23
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Granted: 1983-11-22
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Expires: 2002-09-23
Abstract
Abstract An improved polycarbonate sizing finish is provided comprised of a polycarbonate dissolved in a solvent mixture comprising N-methyl-2-pyrrolidone (NMP) and an alcohol having from 1 to 4 carbon atoms. The use of such a solvent mixture enables a relatively constant concentration of polycarbonate to be maintained, and consequently, enables a sized product fiber to be provided having a substantially uniform polycarbonate concentration thereon. In addition, the solvent may be readily and substantially completely removed from the sized fiber.
Inventors
- 👤 Howell L. Peterson
- 👤 Paul E. McMahon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:46
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/11; C03; C03C; C03C25/00; C03C25/10; C03C25/24; C03C25/26; C03C25/32; C03C25/325; D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/507; D06M15/513; C08J2369/00; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/31504; Y10T428/31507
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
60 words
In a method of applying a polycarbonate finish to a fiber whereby said fiber is contacted with a sizing composition comprising a polycarbonate dissolved in a solvent, said solvent subsequently being removed from said fiber, the improvement wherein said solvent comprises a major amount of N-methyl-2-pyrrolidone and a minor amount of an alcohol having from 1 to 4 carbon atoms.
Claim 2
Dependent Claim
60 words
In a method of applying a polycarbonate finish to a fiber whereby said fiber is contacted with a sizing composition comprising a polycarbonate dissolved in a solvent, said solvent subsequently being removed from said fiber, the improvement wherein said solvent comprises a major amount of N-methyl-2-pyrrolidone and a minor amount of an alcohol having from 1 to 4 carbon atoms.
Claim 3
Dependent Claim
10 words
The method of claim 1 wherein said alcohol comprises ethanol.
Claim 4
Dependent Claim
26 words
The method of claim 1 wherein said polycarbonate is present in an amount ranging from about 2 to 15 percent by weight in said sizing composition.
Claim 5
Dependent Claim
23 words
The method of claim 3 wherein said polycarbonate is present in said sizing composition in an amount of about 6 percent by weight.
Claim 6
Dependent Claim
25 words
The method of claim 1 wherein said sizing composition is applied to said fiber by passing said fiber through a bath comprised of said composition.
Claim 7
Dependent Claim
15 words
The method of claim 1 wherein said solvent is removed by heating said sized fiber.
Claim 8
Dependent Claim
48 words
The method of claim 1 wherein said fiber is comprised of a material selected from the group consisting of carbon fibers, glass fibers, asbestos fibers, synthetic polymeric fibers, aluminum fibers, aluminum oxide fibers, aluminum silicate fibers, titanium fibers, magnesium fibers, rock wool fibers, steel fibers and tungsten fibers.
Claim 9
Dependent Claim
12 words
The method of claim 7 wherein said fiber is a carbon fiber.
Claim 10
Dependent Claim
32 words
The method of claim 1 wherein said sizing composition comprises from about 50 to 90 percent by weight of N-methyl-2-pyrrolidone and from about 50 to 10 percent by weight of said alcohol.
Claim 11
Dependent Claim
25 words
The method of claim 9 wherein said composition comprises about 80 percent by weight of N-methyl-2-pyrrolidone and about 20 percent by weight of said alcohol.
References Cited (Backward Citations)
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US3065204A
Cited
US3580730A
Cited
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Cited
US3919167A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-21 | 1987-05-23 | 1987-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-21 | 1991-05-23 | 1991-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-21 | 1995-05-23 | 1995-11-22 | $7700.00 | Window Closed / Lapsed |