US4885382A
Expired / Lapsed
US
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Method of producing tetrakis[3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxymethyl]methane
Assignee: Tanabe Pharma Corp
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Filing: 1988-02-01
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Granted: 1989-12-05
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Expires: 2008-02-01
Abstract
Abstract A method for producing tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxymethyl]methane by ester exchange between a 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid alkyl ester and pentaerythritol in the presence of a basic catalyst, which comprises carrying out the reaction in the presence of a 3-(3-tert-butyl-4-hydroxyphenyl)propionic acid alkyl ester. According to the method of the invention, tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxymethyl]methane can be obtained in high yields as fine granules having good properties without coloration, with certainty and good reproducibility.
Inventors
- 👤 Masayoshi Gohbayashi
- 👤 Noritsugu Narita
- 👤 Makoto Maruno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:53
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/66; C07C69/73; C07C69/732
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
38 words
A method of producing tetrakis[3-(3,5-di-tert-butyl4-hydroxyphenyl)propionyloxymethyl]methane by ester exchange between a 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid alkyl ester and pentaerythritol in the presence of a basic catalyst, which comprises carrying out the reaction in the presence of a 3-(3-tert-butyl-4-hydroxyphenyl)propionic acid alkyl ester.
Claim 2
Independent Claim
38 words
A method of producing tetrakis[3-(3,5-di-tert-butyl4-hydroxyphenyl)propionyloxymethyl]methane by ester exchange between a 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid alkyl ester and pentaerythritol in the presence of a basic catalyst, which comprises carrying out the reaction in the presence of a 3-(3-tert-butyl-4-hydroxyphenyl)propionic acid alkyl ester.
Claim 3
Dependent Claim
33 words
The method of claim 1, wherein the ester exchange reaction is carried out in the presence of 0.1-5.0% by weight, relative to the 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid alkyl ester, of said 3-(3-tert-butyl-4-hydroxyphenyl)propionic acid alkyl ester.
Claim 4
Dependent Claim
34 words
The method of claim 1, wherein the ester exchange reaction is carried out in the presence of 0.1-10% by weight, relative to the 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid alkyl ester, of an organotin compound as a catalyst.
Claim 5
Dependent Claim
34 words
The method of claim 2, wherein the ester exchange reaction is carried out in the presence of 0.1-10% by weight, relative to the 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid alkyl ester, of an organotin compound as a catalyst.
References Cited (Backward Citations)
US3779945A
Cited
US4396552A
Cited
US4547585A
Cited
US4511491A
Cited
US4594444A
Cited
US4716244A
Cited
US4683326A
Cited
JPH02201846A
Cited
JPH0925349A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-04 | 1993-06-05 | 1993-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-04 | 1997-06-05 | 1997-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-04 | 2001-06-05 | 2001-12-05 | $7700.00 | Window Closed / Lapsed |