Patent US4094844A successfully refreshed from Google Patents.
US4094844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-borne epoxy resin coating compositions
Assignee: Shell USA Inc
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Filing: 1977-03-28
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Granted: 1978-06-13
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Expires: 1997-03-28
Abstract
Abstract Hydrolytically-stable, water-soluble, curable coating compositions are prepared by (1) condensing an excess of a lower molecular weight epoxy resin with an amino-substituted benzoic acid, (2) reacting the terminal epoxide groups of the resulting condensate with a secondary amine and then (3) solubilizing the product by neutralizing or reacting the carboxyl groups with a tertiary amine or ammonia.
Inventors
- 👤 Roy A. Allen
- 👤 Leroy W. Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:57
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/50; C08G59/52; C08G59/14; C08G59/1433; C08G59/1477
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
A hydrolytically-stable, heat-curable composition comprising: (1) a water-soluble composition prepared by (a) condensing a chemical excess of a lower molecular weight epoxy resin with an amino-substituted benzoic acid, (b) reacting the terminal epoxide groups of the resulting condensate with a secondary amine and then (c) solubilizing the product of (b) by neutralizing the carboxyl groups with a tertiary amine or ammonia, and (2) a curing amount of a water-miscible aminoplast or phenolplast resin.
Claim 2
Dependent Claim
73 words
A hydrolytically-stable, heat-curable composition comprising: (1) a water-soluble composition prepared by (a) condensing a chemical excess of a lower molecular weight epoxy resin with an amino-substituted benzoic acid, (b) reacting the terminal epoxide groups of the resulting condensate with a secondary amine and then (c) solubilizing the product of (b) by neutralizing the carboxyl groups with a tertiary amine or ammonia, and (2) a curing amount of a water-miscible aminoplast or phenolplast resin.
Claim 3
Dependent Claim
13 words
The composition of claim 1 wherein the amino-substituted benzoic acid is para-aminobenzoic acid.
Claim 4
Dependent Claim
24 words
The composition of claim 1 wherein the epoxy resin is a glycidyl polyether of 2,2-bis(4-hydroxyphenyl)propane having a molecular weight between about 350 and 1000.
Claim 5
Dependent Claim
32 words
The composition of claim 1 wherein the condensate of step (a) has an acid number between about 30 and 90 and a weight per epoxy of from about 600 to about 1900.
Claim 6
Dependent Claim
12 words
The composition of claim 1 wherein the secondary amine is N-methyl ethanolamine.
Claim 7
Dependent Claim
11 words
The composition of claim 1 wherein the tertiary amine is triethylamine..
Claim 8
Dependent Claim
14 words
The composition of claim 1 wherein the curing agent is a hexamethoxy methylmelamine resin.
Claim 9
Dependent Claim
17 words
The composition of claim 1 containing from about 20% to 30% by volume non-volatiles in a solvent.
Claim 10
Dependent Claim
29 words
The composition of claim 8 wherein the solvent contains from about 70% to 90% by volume of water and from about 10% to 30 % by volume organic solvents.
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) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |