US4464526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polycaprolactone
Assignee: BASF SE
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Filing: 1983-05-31
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Granted: 1984-08-07
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Expires: 2003-05-31
Abstract
Abstract Polycaprolactone is prepared by polymerization of ε-caprolactone by a process wherein a mixture of ε-caprolactone with a monohydric or polyhydric alcohol is passed, at from 50° to 160° C., over a fixed-bed catalyst comprising essentially anhydrous bleaching earth in the form of moldings.
Inventors
- 👤 Herbert Mueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:33
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/823
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
60 words
A process for the preparation of polycaprolactone by polymerization of ε-caprolactone using a monohydric or polyhydric alcohol as an initiator, in the presence of a bleaching earth at from 50 to 160° C., wherein a mixture of caprolactone with a monohydric or polyhydric alcohol is passed over a fixed-bed catalyst comprising essentially anhydrous bleaching earth in the form of moldings.
Claim 2
Dependent Claim
60 words
A process for the preparation of polycaprolactone by polymerization of ε-caprolactone using a monohydric or polyhydric alcohol as an initiator, in the presence of a bleaching earth at from 50 to 160° C., wherein a mixture of caprolactone with a monohydric or polyhydric alcohol is passed over a fixed-bed catalyst comprising essentially anhydrous bleaching earth in the form of moldings.
Claim 3
Dependent Claim
39 words
A process as claimed in claim 1, wherein the bleaching earth moldings used are obtained by converting the bleaching earth to a paste with water, molding the resulting material, and drying the moldings at from 150 to 700° C.
Claim 4
Dependent Claim
18 words
A process as claimed in claim 1, wherein the bleaching earth moldings contain ≦1% by weight of water.
Claim 5
Dependent Claim
15 words
A process as claimed in claim 1, wherein polytetrahydrofuran is used as the polyhydric alcohol.
Claim 6
Dependent Claim
23 words
A process as claimed in claim 1, wherein in polymerization is carried out by a flooding procedure, without a gas phase being formed.
References Cited (Backward Citations)
US3021311A
Cited
GB1272572A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-07 | 1988-02-06 | 1988-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-07 | 1992-02-06 | 1992-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-07 | 1996-02-06 | 1996-08-07 | $7700.00 | Window Closed / Lapsed |