US4618700A
Expired / Lapsed
US
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Process for the preparation of a hydroxyphenylcarboxylate
Assignee: BASF Corp
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Filing: 1984-12-12
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Granted: 1986-10-21
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Expires: 2004-12-12
Abstract
Abstract Pentaerythrityl tetrakis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] is prepared by transesterifying a lower alkyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate with pentaerythritol in the presence of a basic catalyst, without addition of an inert solvent and in a 15 to 50% excess of lower alkyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate over the stoichiometric amount of 4 moles per 1 mole of pentaerythritol. An extremely good yield of pure crystalline product is obtained by the process of the invention.
Inventors
- 👤 Erich Gubler
- 👤 Max Siegrist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:12
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/03; C07C69/00; C07C69/66; C07C69/73; C07C69/732
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
56 words
A process for the preparation of pentaerythrityl tetrakis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] by transesterifying a lower alkyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate with pentaerythritol, in the presence of a catalytic amount of a basic catalyst, which process comprises carrying out the transesterification with a 15 to 50% excess of lower alkyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate over the stoichiometric amount of 4 moles per 1 mole of pentaerythritol.
Claim 2
Dependent Claim
56 words
A process for the preparation of pentaerythrityl tetrakis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] by transesterifying a lower alkyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate with pentaerythritol, in the presence of a catalytic amount of a basic catalyst, which process comprises carrying out the transesterification with a 15 to 50% excess of lower alkyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate over the stoichiometric amount of 4 moles per 1 mole of pentaerythritol.
Claim 3
Dependent Claim
30 words
A process according to claim 1, wherein a 25 to 35% excess of lower alkyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate over the stoichiometric amount of 4 moles per 1 mole of pentaerythritol is used.
Claim 4
Dependent Claim
11 words
A process according to claim 1, wherein lower alkyl is methyl.
Claim 5
Dependent Claim
23 words
A process according to claim 1, wherein the catalyst is used in an amount of 0.5 to 10 mol %, based on pentaerythritol.
Claim 6
Dependent Claim
27 words
A process according to claim 1, wherein lithium amide or dibutyltin oxide is used as catalyst in an amount of 1.0 to 6 mol.%, based on pentaerythritol.
Claim 7
Dependent Claim
13 words
A process according to claim 5, wherein lithium amide is used as catalyst.
Claim 8
Dependent Claim
21 words
A process according to claim 1, wherein the transesterification is carried out in the temperature range from 120° to 220° C.
Claim 9
Dependent Claim
21 words
A process according to claim 1, wherein the transesterification is carried out under a pressure of 30 mbar to 1 mbar.
References Cited (Backward Citations)
US3644482A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-20 | 1990-04-21 | 1990-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-20 | 1994-04-21 | 1994-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-20 | 1998-04-21 | 1998-10-21 | $7700.00 | Window Closed / Lapsed |