US3894075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of hydroxyl-terminated polyesters
Assignee: Stamicarbon BV
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Filing: 1971-03-08
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Granted: 1975-07-08
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Expires: 1991-03-08
Abstract
Abstract A process for producing hydroxy-terminated polyester by polymerizing a lactone or a mixture of lactones in the presence of a catalyst having the general formula MM''(-OROH)4 where M is an alkali metal, M'' is aluminum or boron and R is alkylene, isoalkylene, cycloalkylene or aralkylene. Polyesters having the general formula are produced where R is a bifunctional hydrocarbon group, R'' and R'''' are alkylene groups and n is a whole number equal to or larger than 3.
Inventors
- 👤 Lowhardt A A Schoen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:24
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/823; C07; C07F; C07F5/00; C07F5/06; C07F5/069
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
89 words
IN A PROCESS FOR PRODUCING A HYDROXY-TERMINATED POLYESTER BY THE CATALYTIC POLYMERIZATION OF AT LEAST ONE LACTONE AT A TEMPERATURE OF ABOUT 50* TO ABOUT 250*C, THE IMPROVEMENT CONSISTING OF CONDUCTING THE POLYMERIZATION IN THE PRESENCE OF A CATALYST, THE CATALYST CONSISTING ESSENTIALLY OF A BIMETALLIC ALKOXIDE DERIVED FROM A BIFUNCTIONAL ALCOHOL OF UP TO ABOUT 10 CARBON ATOMS, ONE METAL IN SAID BIMETALLIC OXIDE BEING AN ALKALI METAL, AND THE OTHER METAL IN SAID BIMETALLIC ALKOXIDE BEING SELECTED FROM THE GROUP CONSISTING OF BORON, ALUMINUM, TITANIUM AND ZIRCONIUM.
Claim 2
Dependent Claim
89 words
IN A PROCESS FOR PRODUCING A HYDROXY-TERMINATED POLYESTER BY THE CATALYTIC POLYMERIZATION OF AT LEAST ONE LACTONE AT A TEMPERATURE OF ABOUT 50* TO ABOUT 250*C, THE IMPROVEMENT CONSISTING OF CONDUCTING THE POLYMERIZATION IN THE PRESENCE OF A CATALYST, THE CATALYST CONSISTING ESSENTIALLY OF A BIMETALLIC ALKOXIDE DERIVED FROM A BIFUNCTIONAL ALCOHOL OF UP TO ABOUT 10 CARBON ATOMS, ONE METAL IN SAID BIMETALLIC OXIDE BEING AN ALKALI METAL, AND THE OTHER METAL IN SAID BIMETALLIC ALKOXIDE BEING SELECTED FROM THE GROUP CONSISTING OF BORON, ALUMINUM, TITANIUM AND ZIRCONIUM.
Claim 3
Dependent Claim
31 words
A process according to claim 1, wherein the bimetallic alkoxide catalyst is present in an amount of from 0.01 to 10 mole % based on the lactone, or mixture of lactones.
Claim 4
Dependent Claim
31 words
A process according to claim 1, wherein the bimetallic alkoxide catalyst is present in an amount of from 1 to 10 mole % based on the lactone on mixture of lactones.
Claim 5
Dependent Claim
33 words
A process according to claim 1, wherein the bimetallic alkoxide has the formula MM''(-OROH)4 where M is an alkali metal, M'' is aluminium or boron and R is alkylene, iso-alkylene, cyclo-alkylene, or aralkylene.
Claim 6
Dependent Claim
20 words
A process according to claim 4, whereiN M'' is aluminium and R is an alkylene group with 2-6 carbon atoms.
Claim 7
Dependent Claim
23 words
A process according to claim 1, wherein epsilon -caprolactone, or a mixture of epsilon -caprolactone with one or several other lactones, is polymerized.
References Cited (Backward Citations)
GB654511A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |