Patent US3852240A successfully refreshed from Google Patents.
US3852240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rapid setting formaldehyde-epoxy resin compositions
Assignee: Dow Chemical Co
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Filing: 1973-01-18
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Granted: 1974-12-03
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Expires: 1993-01-18
Abstract
Abstract The ambient curing of glycidyl ether type epoxy resins with primary amines is accelerated by the addition of formaldehyde to the curable mixture.
Inventors
- 👤 H Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:43
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/46
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
83 words
A ROOM TEMPERATURE STABLE EPOXY RESIN COMPOSITION COMPRISING A. AN EPOXY RESIN HAVING AN AVERAGE OF MORE THAN ONE GLYCIDYL ETHER GROUP PER MOLECULE AND B. FORMALDEHYDE, LINEAR OR CYCLIC POLYMERS THEREOF, OR AN ADDUCT OF FORMALDEHYDE WITH A CMPOUND CONTAINING A PLURALITY OF AIPHATIC HYDROXYL GROUPS; WHEREIN THE WEIGHT RATIO OF EPOXY RESIN: FORMALDEHYDE IS FROM ABOUT 3.6:1 TO ABOUT 36:1 AND WHEREIN COMPONENT B IS DISSOLVED IN A SOLVENT SELECTED FROM WATER, ALCOHOLS, OR MONOETHERS OF ETHYLENE POLYGLYCOLS AND PROPYLENE POLYGLYCOLS.
Claim 2
Dependent Claim
83 words
A ROOM TEMPERATURE STABLE EPOXY RESIN COMPOSITION COMPRISING A. AN EPOXY RESIN HAVING AN AVERAGE OF MORE THAN ONE GLYCIDYL ETHER GROUP PER MOLECULE AND B. FORMALDEHYDE, LINEAR OR CYCLIC POLYMERS THEREOF, OR AN ADDUCT OF FORMALDEHYDE WITH A CMPOUND CONTAINING A PLURALITY OF AIPHATIC HYDROXYL GROUPS; WHEREIN THE WEIGHT RATIO OF EPOXY RESIN: FORMALDEHYDE IS FROM ABOUT 3.6:1 TO ABOUT 36:1 AND WHEREIN COMPONENT B IS DISSOLVED IN A SOLVENT SELECTED FROM WATER, ALCOHOLS, OR MONOETHERS OF ETHYLENE POLYGLYCOLS AND PROPYLENE POLYGLYCOLS.
Claim 3
Dependent Claim
19 words
The composition of claim 1 wherein the ratio of epoxy resin: formaldehyde is from about 9:1 to about 18:1.
Claim 4
Dependent Claim
10 words
The composition of claim 2 wherein component B is formaldehyde.
Claim 5
Dependent Claim
13 words
The composition of claim 3 wherein the formaldehyde is in an alcoholic solution.
Claim 6
Dependent Claim
10 words
The composition of claim 4 wherein the alcohol is methanol.
Claim 7
Dependent Claim
114 words
A curable epoxy resin composition comprising A. an epoxy resin having an average of more than one glycidyl ether group per molecule, B. a compound having an average of more than one primary amine group per molecule and C. formaldehyde or a compound capable of releasing formaldehyde at a temperature below about 50*C.; wherein the weight ratio of epoxy formaldehyde or the amount of formaldehyde releasable from said compound capable of releasing formaldehyde of from about 3.6:1 to about 36:1 and the weight ratio of A:B is from about 0.3:1 to about 3:1 and wherein component C is dissolved in a solvent selected from water, alcohols, or monoethers of ethylene polyglycols and propylene polyglycols.
Claim 8
Dependent Claim
114 words
A curable epoxy resin composition comprising A. an epoxy resin having an average of more than one glycidyl ether group per molecule, B. a compound having an average of more than one primary amine group per molecule and C. formaldehyde or a compound capable of releasing formaldehyde at a temperature below about 50*C.; wherein the weight ratio of epoxy formaldehyde or the amount of formaldehyde releasable from said compound capable of releasing formaldehyde of from about 3.6:1 to about 36:1 and the weight ratio of A:B is from about 0.3:1 to about 3:1 and wherein component C is dissolved in a solvent selected from water, alcohols, or monoethers of ethylene polyglycols and propylene polyglycols.
Claim 9
Dependent Claim
40 words
The composition of claim 6 wherein the epoxy resin: formaldehyde or formaldehyde releasable from said compound capable of releasing formaldehyde is from about 9:1 to about 18:1 and the weight ratio of A:B is from about 1.3:1 to about 2:1.
Claim 10
Dependent Claim
10 words
The composition of claim 7 wherein component C is formaldehyde.
Claim 11
Dependent Claim
13 words
The composition of claim 8 wherein the formaldehyde is in an alcoholic solution.
Claim 12
Dependent Claim
100 words
In a process for the ambient temperature curing of an epoxy resin having an average of more than one glycidyl ether group per molecule with a compound having an average of more than one primary amine group per molecule, the improvement which comprises curing in the presence of formaldehyde or a compound capable of releasing formaldehyde dissolved in a solvent selected from water, alcohol, or monoethers of ethylene polyglycols and propylene glycols at a temperature of less than about 50*C. wherein the weight ratio of epoxy resin:formaldehyde or compound capable of releasing formaldehyde is from about 3.6:1 to about 36:1.
Claim 13
Dependent Claim
100 words
In a process for the ambient temperature curing of an epoxy resin having an average of more than one glycidyl ether group per molecule with a compound having an average of more than one primary amine group per molecule, the improvement which comprises curing in the presence of formaldehyde or a compound capable of releasing formaldehyde dissolved in a solvent selected from water, alcohol, or monoethers of ethylene polyglycols and propylene glycols at a temperature of less than about 50*C. wherein the weight ratio of epoxy resin:formaldehyde or compound capable of releasing formaldehyde is from about 3.6:1 to about 36:1.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |