Patent US3989679A successfully refreshed from Google Patents.
US3989679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epoxy resin powder composition
Assignee: Shell USA Inc
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Filing: 1975-01-31
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Granted: 1976-11-02
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Expires: 1995-01-31
Abstract
Abstract Epoxy resin compositions which are solid at 25° C but which can be polymerized for application as a coating powder for outdoor use comprise (A) a solid epoxy-containing reaction product of a diglycidyl ester of a carbocyclic dicarboxylic acid and a dicarboxylic acid component consisting of mainly isophthalic acid and (B) a curing component consisting mainly of an aromatic tricarboxylic acid or anhydride.
Inventors
- 👤 Maarten Sluis
- 👤 Jan H. De Kruif
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:28
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G59/4223; C08G59/02; C08G59/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
168 words
An epoxy resin composition, solid at 25° C and fusible and curable at temperatures above about 150° C, comprising (A) a solid, fusible reaction product of (1) a polyglycidyl ester having from 1.5 to 2.0 epoxy groups per molecule of a carbocyclic dicarboxylic acid and (2) a dicarboxylic acid component containing from about 0% to 50% by weight of at least one aliphatic or cycloaliphatic dicarboxylic acid having at least 6 carbon atoms per molecule and from about 50 to 100% by weight of isophthalic acid, said reaction product having an epoxy equivalent weight of from about 800 to 3000 and being prepared by reacting components A (1) and A (2) in the epoxy/carboxy equivalent ratio of from 1.5:1 to 1.08:1.0 at a temperature of from about 100° to 150° C and (B) a curing amount of a polycarboxylic acid or anhydride thereof containing from about 50 to 100 percent by weight of an aromatic polycarboxylic acid or anhydride thereof having at least three carboxyl functions per molecule.
Claim 2
Dependent Claim
168 words
An epoxy resin composition, solid at 25° C and fusible and curable at temperatures above about 150° C, comprising (A) a solid, fusible reaction product of (1) a polyglycidyl ester having from 1.5 to 2.0 epoxy groups per molecule of a carbocyclic dicarboxylic acid and (2) a dicarboxylic acid component containing from about 0% to 50% by weight of at least one aliphatic or cycloaliphatic dicarboxylic acid having at least 6 carbon atoms per molecule and from about 50 to 100% by weight of isophthalic acid, said reaction product having an epoxy equivalent weight of from about 800 to 3000 and being prepared by reacting components A (1) and A (2) in the epoxy/carboxy equivalent ratio of from 1.5:1 to 1.08:1.0 at a temperature of from about 100° to 150° C and (B) a curing amount of a polycarboxylic acid or anhydride thereof containing from about 50 to 100 percent by weight of an aromatic polycarboxylic acid or anhydride thereof having at least three carboxyl functions per molecule.
Claim 3
Dependent Claim
41 words
The epoxy resin composition as in claim 1, wherein the aliphatic or cycloaliphatic dicarboxylic acid in component A (2) is selected from the group consisting of adipic acid, sebacic acid, 2,2,4-trimethyl adipic acid, tetrahydrophthalic acid, hexahydrophthalic acid, and methyl hexahydrophthalic acid.
Claim 4
Dependent Claim
25 words
The epoxy resin composition as in claim 1, wherein component A (1) is a polyglycidyl ester of a cycloaliphatic dicarboxylic acid having the formula: ##STR2##
Claim 5
Dependent Claim
21 words
The epoxy resin composition as in claim 1, wherein component A(1) is a polyglycidyl ester of phthalic acid or isophthalic acid.
Claim 6
Dependent Claim
27 words
The epoxy resin composition as in claim 1, wherein the aromatic polycarboxylic acid or anhydride thereof having at least three carboxyl functions per molecule is trimellitic anhydride.
Claim 7
Dependent Claim
30 words
The epoxy resin composition as in claim 1, wherein the curing amount of the polycarboxylic acid or anhydride thereof of (B) is from 1.5 to 2.5 times the stoichiometric amount.
Claim 8
Dependent Claim
24 words
The epoxy resin composition as in claim 1, in the form of a powder having a particle size not greater than about 35 microns.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-02 | 1980-05-03 | 1980-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-02 | 1984-05-03 | 1984-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-02 | 1988-05-03 | 1988-11-02 | $7700.00 | Window Closed / Lapsed |