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US4511742A
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Extraction of oligomers from polymers of epihalohydrin
Assignee: Goodrich Corp
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Filing: 1982-08-30
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Granted: 1985-04-16
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Expires: 2002-08-30
Abstract
Abstract Cyclic oligomers are extracted from liquid polyethers, especially polymers of epihalohydrin, by contacting the polyethers with a hydrocarbon solvent containing 3 to 8 carbon atoms while agitating the polyethers.
Inventors
- 👤 Simon H. Yu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:57
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/30; B; B01; B01D; B01D11/00; B01D11/04; B01D11/0492
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
112 words
Method for extracting cyclic oligomers of an epihalohydrin selected from dimers, trimers, tetramers, pentamers, hexamers, heptamers, and the like, from a functionally terminated liquid polyether containing same comprising contacting said polyether with a solvent in which said oligomers are soluble but in which said polyether is substantially insoluble, and separating said solvent from said polyether whereby at least 75% of said oligomers are extracted from said polyether by said solvent, said polyether is selected from homopolymers of an epihalohydrin, copolymers of an epihalohydrin with a cyclic ether monomer containing 2 to 10 carbon atoms, and block copolymers of an epihalohydrin, said copolymers containing 1 to 99 weight percent epihalohydrin in polymerized form.
Claim 2
Dependent Claim
112 words
Method for extracting cyclic oligomers of an epihalohydrin selected from dimers, trimers, tetramers, pentamers, hexamers, heptamers, and the like, from a functionally terminated liquid polyether containing same comprising contacting said polyether with a solvent in which said oligomers are soluble but in which said polyether is substantially insoluble, and separating said solvent from said polyether whereby at least 75% of said oligomers are extracted from said polyether by said solvent, said polyether is selected from homopolymers of an epihalohydrin, copolymers of an epihalohydrin with a cyclic ether monomer containing 2 to 10 carbon atoms, and block copolymers of an epihalohydrin, said copolymers containing 1 to 99 weight percent epihalohydrin in polymerized form.
Claim 3
Dependent Claim
30 words
Method of claim 1 wherein extraction of said oligomers is carried out by repeatedly mixing said solvent with said polyether whereby separation of phases takes place, and separating the phases.
Claim 4
Dependent Claim
30 words
Method of claim 2 wherein said oligomers have molecular weight of less than about 625, said method being effective to remove at least 90% of said oligomers from said polyethers.
Claim 5
Dependent Claim
24 words
Method of claim 3 wherein said solvent is selected from hydrocarbons containing 1 to 15 carbon atoms having boiling points below about 270° C.
Claim 6
Dependent Claim
41 words
Method of claim 3 wherein said solvent is selected from alicyclic and aliphatic hydrocarbons containing 3 to 8 carbon atoms having boiling points in the range of about -40° to 130° C., said polyether is selected from hydroxyl-terminated polymers of epihalohydrins.
Claim 7
Dependent Claim
39 words
Method of claim 5 wherein said polymers of epihalohydrin contain about 5 to 20% by weight of said oligomers and wherein 100 to 5000 parts by weight of solvent is used per 100 parts by weight of said polyether.
Claim 8
Dependent Claim
29 words
Method of claim 5 wherein said polymers of epihalohydrin have molecular weight in the range of about 1000 to 10,000 and said polymers being prepared by cationic ring-opening polymerization.
Claim 9
Dependent Claim
43 words
Method of claim 7 wherein said solvent is selected from cyclic and aliphatic butanes, pentanes, hexanes, and heptanes; and wherein extraction of said oligomers is carried out for a duration of up to about 3 days at a temperature below about 120° C.
Claim 10
Dependent Claim
56 words
Method of claim 8 wherein said polymers are selected from homopolymers of epichlorohydrin, epibromohydrin, epiiodohydrin, and epifluorohydrin, and said polymers being prepared in the presence of water or ethylene glycol with the use of a catalytic amount of a trialkyl oxonium salt of an HMF 6 acid where M is selected from phosphorus, arsenic, and antimony.
Claim 11
Dependent Claim
30 words
Method of claim 9 wherein said polymers are selected from homopolymers of epichlorohydrin and wherein said solvent is recycled to said polymer until the desired degree of extraction is attained.
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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) | 1988-04-15 | 1988-10-15 | 1989-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-15 | 1992-10-15 | 1993-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-15 | 1996-10-15 | 1997-04-16 | $7700.00 | Window Closed / Lapsed |