US4496709A
Expired / Lapsed
US
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Process for preparing epoxy resins employing a phosphonium trifluoroacetate catalyst
Assignee: Dow Chemical Co
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Filing: 1983-06-16
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Granted: 1985-01-29
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Expires: 2003-06-16
Abstract
Abstract Epoxy resins having improved properties are prepared by reacting an epoxy resin with a dihydric phenol in the presence of a sufficient quantity of a phosphonium trifluoroacetate catalyst such that the product resulting from reacting a mixture of the catalyst, epoxy resin and dihydric phenol has a % epoxide difference from the theoretical percent epoxide of from about 0.5 to about 4.0.
Inventors
- 👤 George A. Doorakian
- 👤 Marsha A. Paul
- 👤 Adolphus V. Gist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:55
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/02; C08G59/04; C08G59/06; C08G59/066; C08G59/18; C08G59/68; C08G59/688
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
70 words
In a process for advancing epoxy resins in molecular weight by reacting (A) an epoxy resin which is a glycidyl ether of a dihydric phenol having an average of more than one glycidyl ether group per molecule with (B) a dihydric phenolic or thiophenolic compound in the presence of catalytic quantities of (C) a phosphonium catalyst; the improvement which comprises employing as the catalyst, component (C), a phosphonium trifluoroacetate salt.
Claim 2
Dependent Claim
70 words
In a process for advancing epoxy resins in molecular weight by reacting (A) an epoxy resin which is a glycidyl ether of a dihydric phenol having an average of more than one glycidyl ether group per molecule with (B) a dihydric phenolic or thiophenolic compound in the presence of catalytic quantities of (C) a phosphonium catalyst; the improvement which comprises employing as the catalyst, component (C), a phosphonium trifluoroacetate salt.
Claim 3
Dependent Claim
34 words
A process of claim 1 wherein component (A) is a glycidyl ether of bisphenol A having as average epoxide equivalent weight of from about 156 to about 400 and component (B) is bisphenol A.
Claim 4
Dependent Claim
21 words
A process of claim 2 wherein component (A) has an average epoxide equivalent weight of from about 177 to about 190.
Claim 5
Dependent Claim
57 words
A process of claims 1, 2 or 3 wherein the cation portion of said phosphonium catalyst is represented by the formula ##STR17## wherein each R is independently a hydrocarbyl or substituted hydrocarbyl group having from about 1 to about 20 carbon atoms at least one of which contains an aromatic ring attached directly to the phosphorus atom.
Claim 6
Dependent Claim
35 words
A process of claim 4 wherein said hydrocarbyl groups have from 1 to about 6 carbon atoms and at least two of such R groups contain an aromatic ring attached directly to the phosphorus atom.
Claim 7
Dependent Claim
14 words
A process of claim 5 wherein the catalyst is ethyl triphenyl phosphonium trifluoroacetate salt.
Claim 8
Dependent Claim
44 words
A process of claims 1, 2 or 3 wherein said catalyst is formed insitu from trifluoroacetic acid or a salt thereof and a phosphonium compound having a halide, carboxylate, dicarboxylate, carboxylate.carboxylic acid complex, phosphate, nitrate, sulfate, nitrite, sulfite, borate or chromate as the anion.
Claim 9
Dependent Claim
21 words
A process of claim 7 wherein said catalyst is prepared insitu from trifluoroacetic acid and ethyltriphenyl phosphonium acetate.acetic acid complex salt.
Claim 10
Dependent Claim
41 words
A process of claim 4 wherein said catalyst is formed insitu from trifluoroacetic acid or a salt thereof and a phosphonium compound having a halide, carboxylate, dicarboxylate, carboxylate.carboxylic acid complex, phosphate, nitrate, sulfate, nitrite, sulfite, borate or chromate as the anion.
Claim 11
Dependent Claim
21 words
A process of claim 9 wherein said catalyst is prepared insitu from trifluoroacetic acid and ethyltriphenyl phosphonium acetate.acetic acid complex salt.
Claim 12
Dependent Claim
41 words
A process of claim 5 wherein said catalyst is formed insitu from trifluoroacetic acid or a salt thereof and a phosphonium compound having a halide, carboxylate, dicarboxylate, carboxylate.carboxylic acid complex, phosphate, nitrate, sulfate, nitrite, sulfite, borate or chromate as the anion.
Claim 13
Dependent Claim
21 words
A process of claim 11 wherein said catalyst is prepared insitu from trifluoroacetic acid and ethyltriphenyl phosphonium acetate.acetic acid complex salt.
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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) | 1988-01-29 | 1988-07-30 | 1989-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-29 | 1992-07-30 | 1993-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-29 | 1996-07-30 | 1997-01-29 | $7700.00 | Window Closed / Lapsed |