US4177216A
Expired / Lapsed
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Novel tributyl (2,5-dihydroxyphenyl)phosphonium hydroxide inner salts
Assignee: Dow Chemical Co
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Filing: 1978-09-26
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Granted: 1979-12-04
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Expires: 1998-09-26
Abstract
Abstract The trisubstituted (2,5-dihydroxyphenyl)phosphonium hydroxide inner salts and their hydrolyzed derivatives are novel latent catalysts for promoting reaction between vicinal epoxides and phenols and/or carboxylic acids (or anhydrides). Precatalyzed epoxy resins are easily prepared using such catalysts.
Inventors
- 👤 George A. Doorakian
- 👤 Lawrence G. Duquette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:01
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/68; C08G59/688; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/54; C07F9/5442; C08G59/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
38 words
A tri-n-butyl(2,5-dihydroxyphenyl)phosphonium hydroxide inner salt or a hydrolyzed derivative thereof corresponding to the formula ##STR47## wherein R 1 -R 3 are each n-butyl, R 4 is hydrogen, benzyl or lower alkyl,, and A.sup.⊖ is a compatible neutralizing anion.
Claim 2
Dependent Claim
38 words
A tri-n-butyl(2,5-dihydroxyphenyl)phosphonium hydroxide inner salt or a hydrolyzed derivative thereof corresponding to the formula ##STR47## wherein R 1 -R 3 are each n-butyl, R 4 is hydrogen, benzyl or lower alkyl,, and A.sup.⊖ is a compatible neutralizing anion.
Claim 3
Dependent Claim
15 words
The compound defined by claim 1 wherein A.sup.⊖ is bromide, iodide or a non-nucleophilic anion.
Claim 4
Dependent Claim
11 words
The compound defined by claim 1 wherein R 4 is hydrogen.
Claim 5
Dependent Claim
52 words
A hydrolyzed derivative of a tri-n-butyl(2,5-dihydroxyphenyl)phosphonium hydroxide inner salt corresponding to the formula ##STR48## wherein R 1 -R 3 are each n-butyl, R 4 is hydrogen, benzyl or lower alkyl and A.sup.⊖ is a compatible non-nucleophilic neutralizing anion, and wherein said non-nucleophilic anion is bisulfate, acetate, diacetate, chloroacetate, trifluoroacetate, acrylate or adipate.
Claim 6
Dependent Claim
52 words
A hydrolyzed derivative of a tri-n-butyl(2,5-dihydroxyphenyl)phosphonium hydroxide inner salt corresponding to the formula ##STR48## wherein R 1 -R 3 are each n-butyl, R 4 is hydrogen, benzyl or lower alkyl and A.sup.⊖ is a compatible non-nucleophilic neutralizing anion, and wherein said non-nucleophilic anion is bisulfate, acetate, diacetate, chloroacetate, trifluoroacetate, acrylate or adipate.
Claim 7
Dependent Claim
17 words
The compound defined by claim 4 wherein the non-nucleophilic anion is chloroacetate and R 4 is hydrogen.
References Cited (Backward Citations)
US4093650A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-03 | 1983-06-04 | 1983-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-03 | 1987-06-04 | 1987-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-03 | 1991-06-04 | 1991-12-04 | $7700.00 | Window Closed / Lapsed |