Patent US5453477A successfully refreshed from Google Patents.
US5453477A
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Process of polymerizing chloroetrifluoroethylene with alkyl hydroperoxide and metal metabisulfite
Assignee: Honeywell International Inc
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Filing: 1994-03-07
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Granted: 1995-09-26
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Expires: 2014-03-07
Abstract
Abstract Process for the production of PCTFE homopolymer and/or copolymer resins by the use of an aqueous suspension system incorporating a redox initiator system which comprises t-butyl hydroperoxide and sodium metabisulfite to initiate the polymerization or copolymerization process. The process parameters may be controlled to provide a PCTFE homopolymer or copolymer resin having a desired target range of molecular weights. The process provides stable PCTFE polymer suspensions which exhibit a low tendency to coagulate and further exhibit good wettability of the homopolymer and copolymer particles, notably in the absence of soaps.
Inventors
- 👤 Bryce C. Oxenrider
- 👤 Frank Mares
- 👤 Mo-Shu Yang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:34
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/18; C08F14/24
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
113 words
A process for forming stable, aqueous suspensions of poly(chlorotrifluoroethylene) or a copolymer of chlorotrifluoroethylene and at least one copolymerizable monomer which comprises: (a) forming a polymerization reaction mixture comprising a monomer selected from the group consisting of chlorotrifluoroethylene or a combination of chlorotrifluoroethylene and at least one copolymerizable monomer and a redox initiator system comprising a mixture of an alkyl hydroperoxide and an alkali metal metabisulfite in a reaction solvent comprising water; and (b) polymerizing said monomer in the absence of a soap or a surfactant while maintaining said mixture at a controlled temperature between about 0° C., and 75° C. to form a stable aqueous suspension of said poly(chlorotrifluoroethylene) or said copolymer.
Claim 2
Dependent Claim
113 words
A process for forming stable, aqueous suspensions of poly(chlorotrifluoroethylene) or a copolymer of chlorotrifluoroethylene and at least one copolymerizable monomer which comprises: (a) forming a polymerization reaction mixture comprising a monomer selected from the group consisting of chlorotrifluoroethylene or a combination of chlorotrifluoroethylene and at least one copolymerizable monomer and a redox initiator system comprising a mixture of an alkyl hydroperoxide and an alkali metal metabisulfite in a reaction solvent comprising water; and (b) polymerizing said monomer in the absence of a soap or a surfactant while maintaining said mixture at a controlled temperature between about 0° C., and 75° C. to form a stable aqueous suspension of said poly(chlorotrifluoroethylene) or said copolymer.
Claim 3
Dependent Claim
17 words
The process according to claim 1 wherein said redox initiator system comprises tert-butyl hydroperoxide and sodium metabisulfite.
Claim 4
Dependent Claim
49 words
The process according to claim 1 which comprises: (a) charging said monomer to a reactor vessel; (b) charging to said reactor vessel said redox initiator system and maintaining a controlled temperature throughout the reaction process; and (c) allowing the reaction to proceed to form said poly(chlorotrifluoroethylene) or said copolymer.
Claim 5
Dependent Claim
30 words
The process according to claim 1 wherein said copolymer is a copolymer of chlorotrifluoroethylene and a least one comonomer selected from the group consisting of vinylidene fluoride, tetrafluoroethylene and ethylene.
Claim 6
Dependent Claim
18 words
The process according to claim 1 wherein said temperature is maintained between about 5° and about 60° C.
Claim 7
Dependent Claim
16 words
The process according to claim 1 wherein polymerization takes place in the presence of iron ions.
Claim 8
Dependent Claim
30 words
The process according to claim 6 wherein said iron ions are present in an amount of from about 10 to 1000 ppm based on the weight of the resulting polymer.
Claim 9
Dependent Claim
22 words
The process according to claim 7 wherein said iron ions are charged to said reactor vessel together with said redox initiator system.
Claim 10
Dependent Claim
16 words
The process according to claim 1 wherein said reaction mixture comprises a monomer consisting of chlorotrifluoroethylene.
Claim 11
Dependent Claim
15 words
The process according to claim 1 wherein said reaction mixture comprises chlorotrifluoroethylene and vinylidene fluoride.
Claim 12
Dependent Claim
30 words
The process according to claim 1 further including coagulating said suspension, filtering the resultant coagulant and washing said coagulant, to thereby form a precipitate of said poly(chlorotrifluoroethylene) or said copolymer.
Claim 13
Dependent Claim
11 words
The process according to claim 11 further including drying said precipitate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-09-25 | 1999-03-27 | 1999-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-09-25 | 2003-03-27 | 2003-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-09-25 | 2007-03-27 | 2007-09-26 | $7700.00 | Window Closed / Lapsed |