Patent US4444970A successfully refreshed from Google Patents.
US4444970A
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Process for preparing polyacetylenes and substituted polyacetylenes produced thereby
Assignee: BBC Brown Boveri AG Germany
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Filing: 1982-08-30
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Granted: 1984-04-24
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Expires: 2002-08-30
Abstract
Abstract Substituted polyacetylenes are prepared by contacting a mixture of acetylene and a substituted acetylene with a polymerization catalyst. The substituents on the polyacetylene chains increase the distance between neighboring parallel chains and shield the chains from attack by oxygen, thereby preventing crosslinking of the chains.
Inventors
- 👤 Gert Weddigen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:13
CPC Classifications
C; C08; C08F; C08F238/00; C08F238/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
A process for preparing a substituted polyacetylene by catalytic polymerization which comprises copolymerizing acetylene gas and phenylacetylene in the presence of tungsten pentachloride at a temperature of about 20° C. or greater wherein about 0.5 to 25% of the hydrogen atoms in the copolymer chains are replaced by phenyl groups, thereby producing an interchain distance between adjacent copolymer chains sufficient to hinder oxidative crosslinking therebetween.
Claim 2
Dependent Claim
65 words
A process for preparing a substituted polyacetylene by catalytic polymerization which comprises copolymerizing acetylene gas and phenylacetylene in the presence of tungsten pentachloride at a temperature of about 20° C. or greater wherein about 0.5 to 25% of the hydrogen atoms in the copolymer chains are replaced by phenyl groups, thereby producing an interchain distance between adjacent copolymer chains sufficient to hinder oxidative crosslinking therebetween.
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) | 1987-04-24 | 1987-10-24 | 1988-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-24 | 1991-10-24 | 1992-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-24 | 1995-10-24 | 1996-04-24 | $7700.00 | Window Closed / Lapsed |