Patent US4145491A successfully refreshed from Google Patents.
US4145491A
Expired / Lapsed
US
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Chlorination or chlorosulfonation of polyethylene in mixed solvent
Assignee: EIDP Inc
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Filing: 1977-06-09
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Granted: 1979-03-20
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Expires: 1997-06-09
Abstract
Abstract A process for chlorinating or chlorosulfonating polyethylene comprising dissolving polyethylene in a solvent that is a mixture of methylene chloride and trichlorofluoromethane in a weight ratio of 0.3-1.6, reacting the resultant solution with sulfuryl chloride under pressure to maintain reactants, the resulting chlorinated or chlorosulfonated polyethylene and product gases in a single liquid phase, reducing the pressure on or increasing the temperature of the single liquid phase of chlorinated or chlorosulfonated polyethylene and solvent to form two liquid phases, one a polymer-rich phase and the other a solvent-rich phase, and separating the phases.
Inventors
- 👤 Donald J. Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:02
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/34; C08F8/38
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
121 words
In a continuous process for chlorinating or chlorosulfonating polyethylene which comprises dissolving polyethylene in a solvent and reacting the resultant solution with sulfuryl chloride at a temperature and under sufficient pressure to maintain reactants, the resulting chlorinated or chlorosulfonated polyethylene and product gases in a single liquid phase, the improvement comprising using as the solvent a mixture of methylene chloride and trichlorofluoromethane in a weight ratio of 0.3-1.6, and reducing the pressure on the single liquid phase about 3-15 MPa below the reactor pressure or increasing the temperature on the single liquid phase at least about 10°-20° C. above the reactor temperature to form two liquid phases, one a polymer-rich phase and the other a solvent-rich phase, and separating the phases.
Claim 2
Dependent Claim
121 words
In a continuous process for chlorinating or chlorosulfonating polyethylene which comprises dissolving polyethylene in a solvent and reacting the resultant solution with sulfuryl chloride at a temperature and under sufficient pressure to maintain reactants, the resulting chlorinated or chlorosulfonated polyethylene and product gases in a single liquid phase, the improvement comprising using as the solvent a mixture of methylene chloride and trichlorofluoromethane in a weight ratio of 0.3-1.6, and reducing the pressure on the single liquid phase about 3-15 MPa below the reactor pressure or increasing the temperature on the single liquid phase at least about 10°-20° C. above the reactor temperature to form two liquid phases, one a polymer-rich phase and the other a solvent-rich phase, and separating the phases.
Claim 3
Dependent Claim
19 words
A process of claim 1 wherein pressure on the single liquid phase is reduced to form two liquid phases.
Claim 4
Dependent Claim
14 words
A process of claim 1 wherein a chlorosulfonating catalyst is added to the polyethylene.
Claim 5
Dependent Claim
15 words
A process of claim 1 wherein a free radical initiator is added to the polyethylene.
Claim 6
Dependent Claim
18 words
A process of claim 1 wherein the weight ratio of methylene chloride to trichlorofluoromethane is from about 0.7-1.2.
Claim 7
Dependent Claim
19 words
A process of claim 2 wherein temperature during formation of the two liquid phases is between about 130°-180° C.
Claim 8
Dependent Claim
19 words
A process of claim 2 wherein pressure during reaction of polyethylene with sulfuryl chloride is from about 4.5-21 MPa.
Claim 9
Dependent Claim
18 words
A process of claim 2 wherein the weight ratio of methylene chloride to trichlorofluoromethane is from about 0.7-1.2.
Claim 10
Dependent Claim
14 words
A process of claim 8 wherein the polymer-rich phase is separated by gravity flow.
Claim 11
Dependent Claim
18 words
A process of claim 8 wherein a free radical initiator and chlorosulfonating catalyst are added to the polyethylene.
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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) | 1982-03-19 | 1982-09-18 | 1983-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-19 | 1986-09-18 | 1987-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-19 | 1990-09-18 | 1991-03-20 | $7700.00 | Window Closed / Lapsed |