US4602068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chlorination of polymers
Assignee: BASF SE
•
Filing: 1984-12-17
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Granted: 1986-07-22
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Expires: 2004-12-17
Abstract
Abstract Solid organic polymers are chlorinated with chlorine to give chlorinated polymers in the presence of a solvent which contains from 20 to 100% by weight of phosgene and in which the polymer is dissolved or suspended, at or below the boiling point of the mixture of chlorine and solvent, by initiating the reaction with actinic light or another initiator which produces free radicals. A mixture of not less than 50% by weight of phosgene and a chlorofluorocarbon or chlorofluorohydrocarbon, such as chlorotrifluoromethane, can also be used as the solvent, but phosgene is most suitable.
Inventors
- 👤 Klaus Bronstert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:13
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/18; C08F8/20; C08F8/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
93 words
An process for the chlorination of polymers to achieve random distribution of chlorine in the chlorinated polymer and to provide products having thermal stability and to increase the reaction rate for the reaction of chlorine with the polymer which comprises reacting chlorine with a solid organic polymer which is dissolved or suspended in a halogen containing organic solvent selected from the group consisting of chlorofluorocarbon and chlorofluorohydrocarbon, said reaction being conducted in the presence of a free radical initiator and said solvent containing from about 20% to about 100%, by weight, of phosgene.
Claim 2
Dependent Claim
93 words
An process for the chlorination of polymers to achieve random distribution of chlorine in the chlorinated polymer and to provide products having thermal stability and to increase the reaction rate for the reaction of chlorine with the polymer which comprises reacting chlorine with a solid organic polymer which is dissolved or suspended in a halogen containing organic solvent selected from the group consisting of chlorofluorocarbon and chlorofluorohydrocarbon, said reaction being conducted in the presence of a free radical initiator and said solvent containing from about 20% to about 100%, by weight, of phosgene.
Claim 3
Dependent Claim
12 words
A process as claimed in claim 1, wherein the solvent is phosgene.
Claim 4
Dependent Claim
26 words
A process as claimed in claim 1, wherein the solvent consists of a mixture of not less than 50% by weight of phosgene and a chlorofluorocarbon.
Claim 5
Dependent Claim
26 words
A process as claimed in claim 1 wherein the solvent consists of a mixture of not less than 50% by weight of phosgene and a chlorofluorohydrocarbon.
Claim 6
Dependent Claim
26 words
A process as claimed in claim 1, wherein the solvent consists of a mixture of not less than 50% by weight of phosgene and chlorotrifluoromethane. Drawing.
References Cited (Backward Citations)
CA854775A
Cited
GB815088A
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GB1004193A
Cited
US3597408A
Cited
US3923473A
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US4377459A
Cited
US4386189A
Cited
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US4425206A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-21 | 1990-01-20 | 1990-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-21 | 1994-01-20 | 1994-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-21 | 1998-01-20 | 1998-07-22 | $7700.00 | Window Closed / Lapsed |