US4544731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing advanced epoxy resins
Assignee: Dow Chemical Co
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Filing: 1985-01-07
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Granted: 1985-10-01
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Expires: 2005-01-07
Abstract
Abstract The increase in hydrolyzable halide content in the preparation of advanced epoxy resins is decreased by conducting the advancement in the presence of an unsaturated organic compound.
Inventors
- 👤 Michael B. Cavitt
- 👤 David J. Duncan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:20
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/02; C08G59/04; C08G59/06; C08G59/066
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
92 words
In a process for preparing relatively high molecular weight epoxy resins by reacting at least one relatively low molecular weight epoxy resin with at least one polyhydric phenolic compound in the presence of a suitable advancement catalyst; the improvement which comprises also conducting the reaction in the presence of an effective quantity of at least one organic unsaturated compound so as to reduce the hydrolyzable halide content in the resultant relatively high molecular weight epoxy resin and/or prevent increases in the EEW of the advanced epoxy resin while held at elevated temperatures.
Claim 2
Dependent Claim
92 words
In a process for preparing relatively high molecular weight epoxy resins by reacting at least one relatively low molecular weight epoxy resin with at least one polyhydric phenolic compound in the presence of a suitable advancement catalyst; the improvement which comprises also conducting the reaction in the presence of an effective quantity of at least one organic unsaturated compound so as to reduce the hydrolyzable halide content in the resultant relatively high molecular weight epoxy resin and/or prevent increases in the EEW of the advanced epoxy resin while held at elevated temperatures.
Claim 3
Dependent Claim
75 words
A process of claim 1 wherein (a) said low molecular weight epoxy resin is a diglycidyl ether of a dihydric phenol or polyglycidyl ether of a polyhydric phenol; (b) said polyhydric phenolic compound is a dihydric phenol; and (c) said organic unsaturated compound is at least one unsaturated aliphatic hydrocarbon, cycloaliphatic hydrocarbon, aromatic hydrocarbon having at least one unsaturated aliphatic substituent, alcohol, ketone, aldehyde, carboxylic acid, anhydride, ester, sulfide, mercaptan, ether, nitrile or mixture thereof.
Claim 4
Dependent Claim
64 words
A process of claim 2 wherein (a) said low molecular weight epoxy resin is a diglycidyl ether of a bisphenol; (b) said polyhdyric phenolic compound is a bisphenol; and (c) said organic unsaturated compound is a carboxylic acid having from about 4 to about 10 carbon atoms, a carboxylic acid anhydride having from about 4 to about 10 carbon atoms or a mixture thereof.
Claim 5
Dependent Claim
50 words
A process of claim 3 wherein (a) said epoxy resin is a diglycidyl ether of bisphenol A, a diglycidyl ether of tetrabromobisphenol A or a mixture thereof; (b) said polyhydric phenolic compound is bisphenol A or tetrabromobisphenol A; and (c) said organic unsaturated compound is maleic acid or maleic anhydride.
Claim 6
Dependent Claim
77 words
A process of claim 1 wherein (a) said catalyst is employed in a quantity of from about 0.0003 to about 0.01 mole of catalyst per epoxide equivalent of the relatively low molecular weight epoxy resin; (b) said organic unsaturated compound is employed in a quantity which provides from about 0.001 to about 0.007 mole of unsaturated compound per epoxide equivalent contained in said relatively low molecular weight epoxide resin; and (c) said catalyst is a phosphonium compound.
Claim 7
Dependent Claim
70 words
A process of claim 5 wherein (a) said catalyst is employed in a quantity of from about 0.0005 to about 0.001 mole of catalyst per epoxide equivalent of the relatively low molecular weight epoxy resin; (b) said organic unsaturated compound is employed in a quantity which provides from about 0.002 to about 0.006 mole of organic unsaturated compound per epoxide equivalent contained in said relatively low molecular weight epoxy resin.
Claim 8
Dependent Claim
76 words
A process of claim 2 (a) said catalyst is employed in a quantity of from about 0.0003 to about 0.01 mole of catalyst per epoxide equivalent of the relatively low molecular weight epoxy resin; (b) said organic unsaturated compound is employed in a quantity which provides from about 0.001 to about 0.007 mole of unsaturated compound per epoxide equivalent contained in said relatively low molecular weight epoxide resin; and (c) said catalyst is a phosphonium compound.
Claim 9
Dependent Claim
70 words
A process of claim 7 wherein (a) said catalyst is employed in a quantity of from about 0.0005 to about 0.001 mole of catalyst per epoxide equivalent of the relatively low molecular weight epoxy resin; (b) said organic unsaturated compound is employed in a quantity which provides from about 0.002 to about 0.006 mole of organic unsaturated compound per epoxide equivalent contained in said relatively low molecular weight epoxy resin.
Claim 10
Dependent Claim
77 words
A process of claim 3 wherein (a) said catalyst is employed in a quantity of from about 0.0003 to about 0.01 mole of catalyst per epoxide equivalent of the relatively low molecular weight epoxy resin; (b) said organic unsaturated compound is employed in a quantity which provides from about 0.001 to about 0.007 mole of unsaturated compound per epoxide equivalent contained in said relatively low molecular weight epoxide resin; and (c) said catalyst is a phosphonium compound.
Claim 11
Dependent Claim
70 words
A process of claim 9 wherein (a) said catalyst is employed in a quantity of from about 0.0005 to about 0.001 mole of catalyst per epoxide equivalent of the relatively low molecular weight epoxy resin; (b) said organic unsaturated compound is employed in a quantity which provides from about 0.002 to about 0.006 mole of organic unsaturated compound per epoxide equivalent contained in said relatively low molecular weight epoxy resin.
Claim 12
Dependent Claim
77 words
A process of claim 4 wherein (a) said catalyst is employed in a quantity of from about 0.0003 to about 0.01 mole of catalyst per epoxide equivalent of the relatively low molecular weight epoxy resin; (b) said organic unsaturated compound is employed in a quantity which provides from about 0.001 to about 0.007 mole of unsaturated compound per epoxide equivalent contained in said relatively low molecular weight epoxide resin; and (c) said catalyst is a phosphonium compound.
Claim 13
Dependent Claim
70 words
A process of claim 11 wherein (a) said catalyst is employed in a quantity of from about 0.0005 to about 0.001 mole of catalyst per epoxide equivalent of the relatively low molecular weight epoxy resin; (b) said organic unsaturated compound is employed in a quantity which provides from about 0.002 to about 0.006 mole of organic unsaturated compound per epoxide equivalent contained in said relatively low molecular weight epoxy resin.
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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) | 1988-09-30 | 1989-04-01 | 1989-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-30 | 1993-04-01 | 1993-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-30 | 1997-04-01 | 1997-10-01 | $7700.00 | Window Closed / Lapsed |