Patent US3920773A successfully refreshed from Google Patents.
US3920773A
Expired / Lapsed
US
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Modification of polymers
Assignee: Bayer AG
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Filing: 1972-12-15
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Granted: 1975-11-18
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Expires: 1992-12-15
Abstract
Abstract Method for modifying polymers which contain -CH CH-groups by treating such polymers with a catalyst comprising a tungsten salt and an organo compound of a metal of groups I to IV of the Periodic Table.
Inventors
- 👤 Gottfried Pampus
- 👤 Wolfgang Oberkirch
- 👤 Peter Gunther
- 👤 Nikolaus Schon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:00
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/10; C08F; C08F8/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
147 words
A PROCESS FOR TREATING A POLYMER CONTAINING-CH=CHGROUPS OF WHICH AT LEAST 30% ARE OF THE CIS-CONFIGURATION SO AS TO OBTAIN A MODIFIED POLYMER CONTAINING-CH=CH-GROUPS OF WHICH AT LEAST 90% ARE OF THE TRANS-CONFIGURATION, SAID PROCESS COMPRISING TREATING AT A TEMPERATURE OF -20* TO 100*C. A 10 TO 50% SOLUTION OF SAID POLYMER IN AN INERT ORGANIC SOLVENT WITH A CATALYST OF A. A TUNGSTEN HEXACHLORIDE OR TUNGSTEN HEXAFLUORIDE, B. A COMPOUND OF THE FORMUL AIR3, HALAIR2 OR HAL2AIR WHEREIN HAL IS CHLORINE, BROMINE OR IODINE AND R IS ALKYL OR ALKOXY HAVING 1 TO 12 CARBON ATOMS AND C. AN EXPOXIDE OR A HALOGEN ALCOHOL, THE AMOUNT OF (A) BEING 0.1 TO 10 MMOLS PER 100 G OF POLYMER THE MOLAR RATIO OF (A) TO (C) BEING 1:0.1 TO 1:10, SAID EXPOXIDE RATIO OF (A) TO (C) BEING 1:0.1 TO 1:10, SAID EPOXIDE BEING OF THE FORMULA
Claim 2
Dependent Claim
147 words
A PROCESS FOR TREATING A POLYMER CONTAINING-CH=CHGROUPS OF WHICH AT LEAST 30% ARE OF THE CIS-CONFIGURATION SO AS TO OBTAIN A MODIFIED POLYMER CONTAINING-CH=CH-GROUPS OF WHICH AT LEAST 90% ARE OF THE TRANS-CONFIGURATION, SAID PROCESS COMPRISING TREATING AT A TEMPERATURE OF -20* TO 100*C. A 10 TO 50% SOLUTION OF SAID POLYMER IN AN INERT ORGANIC SOLVENT WITH A CATALYST OF A. A TUNGSTEN HEXACHLORIDE OR TUNGSTEN HEXAFLUORIDE, B. A COMPOUND OF THE FORMUL AIR3, HALAIR2 OR HAL2AIR WHEREIN HAL IS CHLORINE, BROMINE OR IODINE AND R IS ALKYL OR ALKOXY HAVING 1 TO 12 CARBON ATOMS AND C. AN EXPOXIDE OR A HALOGEN ALCOHOL, THE AMOUNT OF (A) BEING 0.1 TO 10 MMOLS PER 100 G OF POLYMER THE MOLAR RATIO OF (A) TO (C) BEING 1:0.1 TO 1:10, SAID EXPOXIDE RATIO OF (A) TO (C) BEING 1:0.1 TO 1:10, SAID EPOXIDE BEING OF THE FORMULA
Claim 3
Dependent Claim
33 words
The process of claim 1 wherein the polymer is polybutadiene, polypentadiene, polypentenamer, a copolymer of butadiene and styrene, a copolymer of butadiene and acrylonitrile or a copolymer of cyclopentene with another olefinic hydrocarbon.
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein said polymer is polybutadiene having less than 50% of its double bonds in the 1,4-trans-configuration.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein the polymer is polybutadiene containing more than 85% of its double bonds in the 1,4-cis-configuration.
References Cited (Backward Citations)
US3558589A
Cited
US3647908A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |