Patent US1768429A successfully refreshed from Google Patents.
Patent US4009128A successfully refreshed from Google Patents.
US4009128A
Expired / Lapsed
US
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Polymerization of epoxides
Assignee: Hercules LLC
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Filing: 1975-01-14
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Granted: 1977-02-22
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Expires: 1995-01-14
Abstract
Abstract An improved process for the polymerization of epoxides with an organoaluminum catalyst is described. Improvements in conversion, yield and reaction rate are realized by contacting the epoxide at a temperature below 0° C. with at least a catalytic amount of the organoaluminum compound in the presence of at least 0.1 mole, per mole of aluminum, of a perhalogenated aliphatic monoketone which is preferably hexafluoroacetone.
Inventors
- 👤 Edwin J. Vandenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:08
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/08; C08G65/10; C08G65/12; C08G65/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
80 words
A process for polymerizing epoxides wherein the epoxy group is an oxirane ring comprising contacting at least one of said epoxides at a temperature below 0° C. with at least a catalytic amount of an organoaluminum compound having the formula AlRX 2 where R is alkyl, cycloalkyl, aryl or alkaryl and X is alkyl, aryl, cycloalkyl, hydrogen, halogen, alkoxy, acetoxy, stearoxy or benzoxy in the presence of at least 0.1 mole, per mole of aluminum, of a perhalogenated aliphatic monoketone.
Claim 2
Dependent Claim
80 words
A process for polymerizing epoxides wherein the epoxy group is an oxirane ring comprising contacting at least one of said epoxides at a temperature below 0° C. with at least a catalytic amount of an organoaluminum compound having the formula AlRX 2 where R is alkyl, cycloalkyl, aryl or alkaryl and X is alkyl, aryl, cycloalkyl, hydrogen, halogen, alkoxy, acetoxy, stearoxy or benzoxy in the presence of at least 0.1 mole, per mole of aluminum, of a perhalogenated aliphatic monoketone.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the epoxide is a 1,4-dihalo-2,3-epoxybutane.
Claim 4
Dependent Claim
13 words
The process of claim 2 wherein the ketone is a perhalogenated dialkyl monoketone.
Claim 5
Dependent Claim
10 words
The process of claim 3 wherein the ketone is hexafluoroacetone.
Claim 6
Dependent Claim
11 words
The process of claim 4 wherein the organoaluminum compound is triethylaluminum.
Claim 7
Dependent Claim
10 words
The process of claim 4 wherein the epoxide is cis-1,4-dichloro-2,3-epoxybutane.
Claim 8
Dependent Claim
27 words
The process of claim 4 wherein the organoaluminum compound is triisobutylaluminum which has been reacted with from 0.2 to 1.5 mole of water per mole of aluminum.
Claim 9
Dependent Claim
10 words
The process of claim 7 wherein the epoxide is cis-1,4-dichloro-2,3-epoxybutane.
Claim 10
Dependent Claim
15 words
The process of claim 7 wherein the epoxide is a mixture of cis- and trans1,4-dichloro-2,3-epoxybutane.
Claim 11
Dependent Claim
10 words
The process of claim 1 wherein the epoxide is epichlorohydrin.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-22 | 1980-08-23 | 1981-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-22 | 1984-08-23 | 1985-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-22 | 1988-08-23 | 1989-02-22 | $7700.00 | Window Closed / Lapsed |