US5023316A
Expired / Lapsed
US
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Catalytic polymerization of β-substituted-β-propiolactones by oligomeric isobutylaluminoxane
Assignee: ExxonMobil Chemical Patents Inc
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Filing: 1990-06-14
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Granted: 1991-06-11
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Expires: 2010-06-14
Abstract
Abstract A method of polymerizing at least one beta -substituted- beta -propiolactone in the presence of a catalytic amount of isobutylaluminoxane in a solvent for the beta -propiolactone(s) and isobutylaluminoxane for a time and at a temperature to produce a poly( beta -substituted- beta -propiolactone) polyester and the polyesters produced thereby are disclosed.
Inventors
- 👤 Manuela Benvenuti
- 👤 Robert W. Lenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:12
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/823
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
44 words
A method of preparing a polyester comprising polymerizing at least one β-substituted-β-propiolactone in the presence of a catalytic amount of isobutylaluminoxane in a solvent for said isobutylaluminoxane and for said β-substituted-β-propiolactone for a reaction time and at a temperature sufficient to produce said polyester.
Claim 2
Independent Claim
44 words
A method of preparing a polyester comprising polymerizing at least one β-substituted-β-propiolactone in the presence of a catalytic amount of isobutylaluminoxane in a solvent for said isobutylaluminoxane and for said β-substituted-β-propiolactone for a reaction time and at a temperature sufficient to produce said polyester.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein said process comprises copolymerizing two different β-substituted-β-propiolactones to produce a copolyester.
Claim 4
Dependent Claim
10 words
The process of claim 1 wherein said β-substituted-β-propiolactone comprises [R,S]-β-butyrolactone.
Claim 5
Dependent Claim
14 words
The process of claim 2 wherein said dissimilar β-substituted-β-propiolactones comprise [R,S]-β-butyrolactone and [R,S]-β-benzyl malolactonate.
Claim 6
Dependent Claim
19 words
The process of claim 1 wherein said solvent is selected from the group consisting of heptane, toluene, and hexane.
Claim 7
Dependent Claim
10 words
The process of claim 1 wherein said solvent comprises heptane.
Claim 8
Dependent Claim
20 words
The process of claim 1 wherein said reaction time is in the range of from about 3 to 5 days.
Claim 9
Dependent Claim
20 words
The process of claim 2 wherein said reaction time is in the range of from about 3 to 5 days.
Claim 10
Dependent Claim
19 words
The process of claim 1 wherein said temperature is in the range of from about 60 to 80° C.
Claim 11
Dependent Claim
29 words
The process of claim 1 wherein said isobutylaluminoxane is present in an amount to give a mole percent range of Al to β-substituted-β-propiolactone monomer from about 0.005 to 0.01.
Claim 12
Dependent Claim
30 words
The process of claim 2 wherein said isobutylaluminoxane is present in an amount to give a mole percent range of Al to β-substituted-β-propiolactone monomers of from about 0.005 to 0.01.
Claim 13
Dependent Claim
9 words
A polyester made by the process of claim 1.
Claim 14
Dependent Claim
9 words
A copolyester made by the process of claim 2.
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) | 1994-06-10 | 1994-12-10 | 1995-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-10 | 1998-12-10 | 1999-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-10 | 2002-12-10 | 2003-06-11 | $7700.00 | Window Closed / Lapsed |