Patent US4040994A successfully refreshed from Google Patents.
US4040994A
Expired / Lapsed
US
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Cured epoxy resins
Assignee: Unitech Chemical Inc
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Filing: 1976-11-26
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Granted: 1977-08-09
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Expires: 1996-11-26
Abstract
Abstract Improved epoxy resins are prepared by the anhydride curing of an epoxy system containing three or more epoxy compounds, at least two of which are epoxidized fatty acid esters.
Inventors
- 👤 Morton Lewis
- 👤 John F. Rohrer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:13
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G59/20; C08G59/32; C08G59/38; C08G59/68
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
70 words
A thermosetting epoxy resin comprising the reaction product of (a) from about 25 to 75% by weight (basis total epoxy content) of a non-fatty polyepoxide compound, having reactive 1,2-epoxy groups (b) from about 25 to 75% by weight (basis tital epoxy content) of at least two epoxidized fatty acid esters, and (c) from about 0.4 to 1.2 chemical equivalents (basis total epoxy content) of a polycarboxylic acid anhydride curing agent.
Claim 2
Dependent Claim
70 words
A thermosetting epoxy resin comprising the reaction product of (a) from about 25 to 75% by weight (basis total epoxy content) of a non-fatty polyepoxide compound, having reactive 1,2-epoxy groups (b) from about 25 to 75% by weight (basis tital epoxy content) of at least two epoxidized fatty acid esters, and (c) from about 0.4 to 1.2 chemical equivalents (basis total epoxy content) of a polycarboxylic acid anhydride curing agent.
Claim 3
Dependent Claim
21 words
The thermosetting resin of claim 1 wherein the non-fatty polyepoxide is the reaction product of an epihalohydrin and a dihydric phenol.
Claim 4
Dependent Claim
46 words
The thermosetting resin of claim 2 wherein the epoxidized fatty acid esters are selected from the group consisting of epoxidized linseed oil, epoxidized soybean oil, epoxidized menhaden oil, butyl epoxy linseedate, and 2-ethyl hexyl epoxy tallate, and wherein the polyepoxide is a diglycidyl ether of bisphenol.
Claim 5
Dependent Claim
26 words
The thermosetting resin of claim 3 wherein the anhydride is selected from the group consisting of dodecylsuccinic anhydride, methyl endomethylene tetrahydrophthalic anhydride and methyl tetrahydrophthalic anhydride.
Claim 6
Dependent Claim
84 words
A process for preparing a thermosetting epoxy resin comprising heating in the presence of a catalytic amount of an epoxy/anhydride reaction accelerator a mixture containing (a) from about 25 to 75% by weight (basis total epoxy content) of a non-fatty polyepoxide compound, having reactive 1,2-epoxy groups (b) from about 25-75% by weight (basis total epoxy content) of at least two epoxidized fatty acid esters, and (c) from about 0.4 to 1.2 chemical equivalents basis total epoxy content of a polycarboxylic acid anhydride curing agent.
Claim 7
Dependent Claim
84 words
A process for preparing a thermosetting epoxy resin comprising heating in the presence of a catalytic amount of an epoxy/anhydride reaction accelerator a mixture containing (a) from about 25 to 75% by weight (basis total epoxy content) of a non-fatty polyepoxide compound, having reactive 1,2-epoxy groups (b) from about 25-75% by weight (basis total epoxy content) of at least two epoxidized fatty acid esters, and (c) from about 0.4 to 1.2 chemical equivalents basis total epoxy content of a polycarboxylic acid anhydride curing agent.
Claim 8
Dependent Claim
61 words
The process of claim 5 wherein the non-fatty polyepoxide is present in the amount of from about 50 to 75% by weight, wherein the epoxidized fatty esters are present in the amount of from about 25 to 50% by weight, and wherein the anhydride curing agent is present in the amount of from about 0.4 to 0.9 equivalents basis total epoxy.
Claim 9
Dependent Claim
38 words
The process of claim 6 wherein the non-fatty polyepoxide is a diglycidyl ether of bis-phenol, and wherein the anhydride curing agent is selected from the group consisting of dodecylsuccinic andydride, methyl tetrahydrophthalic anhydride, and methyl endomethylene tetrahydrophthalic anhydride.
Claim 10
Dependent Claim
34 words
The process of claim 7 wherein the epoxidized fatty esters are selected from the group consisting of epoxidized linseed oil, epoxidized soybean oil, epoxidized menhaden oil, butyl epoxy linseedate and 2-ethyl hexyl epoxy tallate.
Claim 11
Dependent Claim
12 words
The process of claim 8 wherein the catalyst comprises benzyl dimethyl amine.
Claim 12
Dependent Claim
12 words
The process of claim 8 wherein the catalyst comprises active chromium-2-ethyl hexanoate.
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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) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |