Patent US2820508A successfully refreshed from Google Patents.
Patent US4737530A successfully refreshed from Google Patents.
US4737530A
Expired / Lapsed
US
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Water-reducible coating composition based on an epoxy resin
Assignee: Akzo NV
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Filing: 1987-04-28
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Granted: 1988-04-12
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Expires: 2007-04-28
Abstract
Abstract The invention provides a water-reducible coating composition comprising an epoxy resin, an amino group-containing curing agent for the epoxy resin and a formic acid ester having a solubility of at least 0.2 g in 100 g of water of a temperature of 20° C., with the exception of tert. butyl formiate.
Inventors
- 👤 Cornelis A. M. Hoefs
- 👤 Pieter Oosterhoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:11
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/50; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/101
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
49 words
A water reducible coating composition comprising (a) an epoxy resin, (b) an amino group containing curing agent for the epoxy resin, and (c) a formic acid ester other than tert. butyl formate having a solubility of at least 0,2 g in 100 g of a temperature of 20° C.
Claim 2
Dependent Claim
49 words
A water reducible coating composition comprising (a) an epoxy resin, (b) an amino group containing curing agent for the epoxy resin, and (c) a formic acid ester other than tert. butyl formate having a solubility of at least 0,2 g in 100 g of a temperature of 20° C.
Claim 3
Dependent Claim
23 words
The coating compositon of claim 1, wherein the ester is an ester of formic acid and a monovalent alcohol having 1-6 carbon atoms.
Claim 4
Dependent Claim
23 words
The coating composition of claim 2, wherein the ester is an ester of formic acid and a monovalent alcohol having 1-5 carbon atoms.
Claim 5
Dependent Claim
56 words
The coating compositon of claim 1, wherein the ester is a formic acid ester of the general formula ##STR3## wherein R 1 and R 2 may be the same or different and represent a hydrogen atom or an alkyl group, with the groups R 1 and R 2 together containing not more than 5 carbon atoms.
Claim 6
Dependent Claim
17 words
The coating composition of claim 1, wherein the ester is methyl formate, ethyl formate, or isopropyl formate.
Claim 7
Dependent Claim
26 words
The coating composition of claim 1, wherein the ester is an ester of formic acid and a di- or polyvalent hydroxy compound having 2-8 carbon atoms.
Claim 8
Dependent Claim
26 words
The coating composition of claim 1, wherein the ester has a solubility of 0,2-50 g in 100 g of water of a temperature of 20° C.
Claim 9
Dependent Claim
25 words
The coating composition of claim 7, wherein the ester has a solubility of 0,5-35 g in 100 g water of a temperature of 20° C.
Claim 10
Dependent Claim
32 words
The coating composition of claim 1, wherein the ester is present in an amount such that 0,4-2 equivalents of formate are present per equivalent of nitrogen of the amino group-containing curing agent.
Claim 11
Dependent Claim
37 words
A mixture of (a) an epoxy resin and (b) a formic acid ester other than tert. butyl formate having a solubility of at least 0,2 g in 100 g of water of a temperature of 20° C.
Claim 12
Dependent Claim
37 words
A mixture of (a) an epoxy resin and (b) a formic acid ester other than tert. butyl formate having a solubility of at least 0,2 g in 100 g of water of a temperature of 20° C.
Claim 13
Dependent Claim
14 words
The mixture of claim 10, also containing an organic solvent for the epoxy resin.
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) | 1991-04-12 | 1991-10-12 | 1992-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-12 | 1995-10-12 | 1996-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-12 | 1999-10-12 | 2000-04-12 | $7700.00 | Window Closed / Lapsed |