Patent US3914486A successfully refreshed from Google Patents.
Patent US4857490A successfully refreshed from Google Patents.
US4857490A
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Process of manufacturing boron ceramics from carboralated diacetylene polymers
Assignee: CNA Holdings LLC
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Filing: 1988-11-18
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Granted: 1989-08-15
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Expires: 2008-11-18
Abstract
Abstract Boron-containing ceramics are formed from organoboron precermaic polymers which are carboralated acetylenic poolymers. The polymers can be formed by carboralating acetylenic or diacetylenic diols and condensing the diols to form carboralated polyesters. In an alternative process, polydiacetylene formed by the polymerization of diacetylene monomers having conjugated triple bonds are carboralated subsequent to polymerization. A process for obtaining readily soluble polydiacetylenes comprises heating a diacetylene diol in a high boiling solvent.
Inventors
- 👤 Robert E. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:23
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/62227; C04B35/62272; C04B35/62277; C04B35/515; C04B35/56; C04B35/563; C04B35/58; C04B35/583; C04B35/62286; C04B35/6229; C04B35/626; C04B35/62605; C04B35/62625; C04B35/6264; C04B35/62645; C04B35/6267; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; C04B35/63408; C08; C08G; C08G79/00; C08G79/08; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/46; C04B2235/465; C04B2235/48; C04B2235/486
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
67 words
A process for producing a boron-containing ceramic from organoboron preceramic polymers comprising: forming a preceramic polymer by carboralating a polydiacetylene polymer which contains as a repeating unit a conjugated double and triple bond so as to form carborane units at the location of said triple bonds of said polydiacetylene and pyrolyzing said carboralated polydiacetylene at a temperature sufficient to convert said carboralated polydiacetylene to a boron-containing ceramic.
Claim 2
Dependent Claim
67 words
A process for producing a boron-containing ceramic from organoboron preceramic polymers comprising: forming a preceramic polymer by carboralating a polydiacetylene polymer which contains as a repeating unit a conjugated double and triple bond so as to form carborane units at the location of said triple bonds of said polydiacetylene and pyrolyzing said carboralated polydiacetylene at a temperature sufficient to convert said carboralated polydiacetylene to a boron-containing ceramic.
Claim 3
Dependent Claim
17 words
The process of claim 1, wherein said polydiacetylene polymer has molecular weight (Mw) of 1000 to 10,000.
Claim 4
Dependent Claim
21 words
The process of claim 1, wherein said preceramic polymer is pyrolyzed in an inert gas to yield a boron carbide-containing ceramic.
Claim 5
Dependent Claim
30 words
The process of claim 1, wherein said preceramic polymer is pyrolyzed in a gas reactive with boron to yield a ceramic comprising a product of boron and said reactive gas.
Claim 6
Dependent Claim
19 words
The process of claim 4, wherein said reactive gas is a nitrogen-containing gas and said ceramic comprises boron nitride.
Claim 7
Dependent Claim
13 words
The process of claim 5, wherein said nitrogen-containing gas is ammonia or nitrogen.
Claim 8
Dependent Claim
29 words
The process of claim 3 comprising spinning said preceramic polymer into a fiber prior to pyrolyzation and pyrolyzing said preceramic polymeric fiber to yield to a boron carbide-containing fiber.
Claim 9
Dependent Claim
28 words
The process of claim 5 comprising spinning said preceramic polymer into a fiber prior to pyrolyzation and pyrolyzing said preceramic polymeric fiber to yield a boron nitride-containing fiber.
References Cited (Backward Citations)
US3234288A
Cited
US3359304A
Cited
US3183216A
Cited
US3505409A
Cited
US3121117A
Cited
US3097195A
Cited
US3254117A
Cited
US3217031A
Cited
US3247256A
Cited
US3351616A
Cited
US3429722A
Cited
US3668059A
Cited
US4238547A
Cited
US4220747A
Cited
US4097294A
Cited
US4439346A
Cited
US4277588A
Cited
US4258079A
Cited
US4562141A
Cited
US4581461A
Cited
US4581468A
Cited
US4687657A
Cited
US4707556A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-14 | 1993-02-13 | 1993-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-14 | 1997-02-13 | 1997-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-14 | 2001-02-13 | 2001-08-15 | $7700.00 | Window Closed / Lapsed |