US4360682A
Expired / Lapsed
US
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Stabilizing caprolactones with dihydroxybenzenes
Assignee: Bayer AG
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Filing: 1980-05-12
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Granted: 1982-11-23
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Expires: 2000-05-12
Abstract
Abstract Caprolactones such as epsilon -caprolactone are stabilized against discoloration with dihydroxybenzenes such as hydroquinone or compounds of the formula <IMAGE> in which R1 is alkyl of 1 to 8 carbon atoms, and R2 is hydrogen or alkyl of 1 to 8 carbon atoms. Even the presence of air is not detrimental.
Inventors
- 👤 Herbert Klenk
- 👤 Rolf Wirthwein
- 👤 Helmut Waldmann
- 👤 Hermann Seifert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:53
CPC Classifications
C; C07; C07D; C07D315/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
35 words
A composition consisting essentially of caprolactone and a color stabilizing amount of a dihydroxybenzene of the formula ##STR3## in which R 1 is alkyl of 1 to 8 carbon atoms, and R 2 is hydrogen.
Claim 2
Dependent Claim
35 words
A composition consisting essentially of caprolactone and a color stabilizing amount of a dihydroxybenzene of the formula ##STR3## in which R 1 is alkyl of 1 to 8 carbon atoms, and R 2 is hydrogen.
Claim 3
Dependent Claim
18 words
A stabilized composition according to claim 1, wherein the dihydroxybenzene is present in about 50 to 500 ppm.
Claim 4
Dependent Claim
18 words
A stabilized composition according to claim 1, wherein the dihydroxybenzene is present in about 100 to 500 ppm.
Claim 5
Dependent Claim
23 words
A composition according to claim 1 wherein R 1 is alkyl of 1 to 8 carbon atoms branched at the alpha carbon atom.
Claim 6
Dependent Claim
13 words
A composition according to claim 1 wherein R 1 is a tert.-alkyl group.
Claim 7
Dependent Claim
17 words
A composition according to claim 1 wherein R 1 is an alkyl group of 3-8 carbon atoms.
Claim 8
Dependent Claim
15 words
A composition according to claim 1 wherein said caprolactone is stabilized with tertiary butyl hydroquinone.
Claim 9
Dependent Claim
14 words
A composition according to claim 1 wherein said caprolactone is stabilized with 4-tert.-butyl catechol.
Claim 10
Dependent Claim
50 words
A process for stabilizing caprolactone comprising adding thereto a color stabilizing effective amount of a composition consisting essentially of a dihydroxybenzene in the presence of air, said dihydroxybenzene being one of the formula ##STR4## wherein R 1 is alkyl of 1 to 8 carbon atoms, and R 2 is hydrogen.
Claim 11
Dependent Claim
50 words
A process for stabilizing caprolactone comprising adding thereto a color stabilizing effective amount of a composition consisting essentially of a dihydroxybenzene in the presence of air, said dihydroxybenzene being one of the formula ##STR4## wherein R 1 is alkyl of 1 to 8 carbon atoms, and R 2 is hydrogen.
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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) | 1985-11-22 | 1986-05-24 | 1986-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-22 | 1990-05-24 | 1990-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-22 | 1994-05-24 | 1994-11-23 | $7700.00 | Window Closed / Lapsed |