US4214068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Esters containing phenolic groups as epoxy resin curing agents
Assignee: Shell USA Inc
•
Filing: 1979-05-10
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Granted: 1980-07-22
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Expires: 1999-05-10
Abstract
Abstract Phenolic curing agents, especially suitable for use in powder coatings, are prepared by reacting a dihydric phenol (diphenylol propane), a diepoxide (liquid diglycidyl ether of diphenylol propane), and a dicarboxylic acid (adipic acid) with the phenolic functionality in excess over the difference between the epoxy functionality and the acid functionality.
Inventors
- 👤 Gerardus C. M. Schreurs
- 👤 Werner Th. Raudenbusch
- 👤 Theodorus N. Visser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:57
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/68; C08G59/686; C08G59/182; C08G59/40; C08G59/42; C08G59/4284; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24628; Y10T428/24669; Y10T428/24694; Y10T428/24711; Y10T428/24719
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
86 words
A phenolic compound, suitable as a curing agent for epoxy resins, having the generalized formula: ##STR8## wherein n is a number having an average value of from 0.3 to 4, R 1 is the hydrocarbon residue of a dihydric phenol, R 2 is the hydrocarbon residue of a dicarboxylic acid, and R 3 is a divalent group having a formula: ##STR9## wherein m is a number having an average value of from 0 to 4, and R 4 is the hydrocarbon residue of a dihydric phenol.
Claim 2
Dependent Claim
86 words
A phenolic compound, suitable as a curing agent for epoxy resins, having the generalized formula: ##STR8## wherein n is a number having an average value of from 0.3 to 4, R 1 is the hydrocarbon residue of a dihydric phenol, R 2 is the hydrocarbon residue of a dicarboxylic acid, and R 3 is a divalent group having a formula: ##STR9## wherein m is a number having an average value of from 0 to 4, and R 4 is the hydrocarbon residue of a dihydric phenol.
Claim 3
Dependent Claim
17 words
The phenolic compound of claim 1 wherein n has an average value of from 1 to 4.
Claim 4
Dependent Claim
18 words
The phenolic compound of claim 1 wherein R 2 is the divalent group --(CH 2 ) 4 --.
Claim 5
Dependent Claim
21 words
A pulverulent heat-curable coating composition, comprising a normally solid polyepoxide, and the normally solid phenolic compound curing agent of claim 1.
Claim 6
Dependent Claim
15 words
The pulverulent heat-curable composition of claim 4, which additionally contains 1,6-bis(dimethylamino)hexane as a curing accelerator.
Claim 7
Dependent Claim
66 words
A process for the preparation of the phenolic compound of claim 1 wherein a dihydric phenol having the formula HO--R 1 --OH, a diepoxide having the formula: ##STR10## and a dicarboxylic acid having the formula: ##STR11## are reacted in the molar ratio of dihydric phenol:diepoxide:dicarboxylic acid of <2:(n+1):n, in the presence of a suitable catalyst at a temperature of from about 130° to about 160° C.
Claim 8
Dependent Claim
12 words
The process of claim 6 wherein the dicarboxylic acid is adipic acid.
Claim 9
Dependent Claim
11 words
The process of claim 6 wherein the dihydric phenol is 2,2-bis(4-hydroxyphenyl)propane.
Claim 10
Dependent Claim
14 words
The process of claim 6 wherein the diepoxide is a diglycidyl ether of 2,2-bis(4-hydroxyphenyl)propane.
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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) | 1983-07-22 | 1984-01-21 | 1984-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-22 | 1988-01-21 | 1988-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-22 | 1992-01-21 | 1992-07-22 | $7700.00 | Window Closed / Lapsed |