Patent US3945971A successfully refreshed from Google Patents.
US3945971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenyl urea epoxy resin accelerator
Assignee: Shell USA Inc
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Filing: 1974-12-20
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Granted: 1976-03-23
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Expires: 1994-12-20
Abstract
Abstract A process for preparing cured epoxy resins, the cured epoxy products, and the curing composition employed, are disclosed. The process comprises contacting an epoxy resin with the curing composition, i.e., a polyamine curing agent and a phenyl urea accelerator. Also disclosed are cured epoxy resin compositions useful in adhesives, coatings, floorings, laminates and civil engineering applications.
Inventors
- 👤 Tony Harrison
- 👤 Roger G. Weatherhead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:49
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/68; C08G59/686
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
119 words
In the process for preparing cured epoxy resins which comprises contacting an epoxy resin of the oxirane structure and having an oxirane epoxy equivalency greater than 1.0 with a polyamine curing agent having more than one non-tertiary amino group per molecule, the improvement which comprises conducting said contacting in the presence of from about 0.005 to about 0.1 moles per 100 parts of the epoxy resin of an accelerator of the general formula: ##EQU5## wherein R is ##SPC3## R 2 is selected from the group consisting of an alkyl group containing from 1 to 4 carbon atoms, chlorine and bromine, n is 0, 1 or 2, and R 1 is selected from the group consisting of R and H.
Claim 2
Dependent Claim
119 words
In the process for preparing cured epoxy resins which comprises contacting an epoxy resin of the oxirane structure and having an oxirane epoxy equivalency greater than 1.0 with a polyamine curing agent having more than one non-tertiary amino group per molecule, the improvement which comprises conducting said contacting in the presence of from about 0.005 to about 0.1 moles per 100 parts of the epoxy resin of an accelerator of the general formula: ##EQU5## wherein R is ##SPC3## R 2 is selected from the group consisting of an alkyl group containing from 1 to 4 carbon atoms, chlorine and bromine, n is 0, 1 or 2, and R 1 is selected from the group consisting of R and H.
Claim 3
Dependent Claim
18 words
A process as in claim 1 wherein said epoxy resin is liquid at the temperature of said contacting.
Claim 4
Dependent Claim
16 words
A process as in claim 2 wherein said epoxy resin is a diglycidyl ether of 2,2-bis(4-hydroxyphenyl)propane.
Claim 5
Dependent Claim
16 words
A process as in claim 1 wherein the polyamine curing agent is a liquid cycloaliphatic polyamine.
Claim 6
Dependent Claim
14 words
A process as in claim 4 wherein the polyamine curing agent is isophorone diamine.
Claim 7
Dependent Claim
12 words
A process as in claim 1 wherein the accelerator is phenyl urea.
Claim 8
Dependent Claim
12 words
A process as in claim 1 wherein the accelerator is 1,3-diphenyl urea.
Claim 9
Dependent Claim
141 words
An insoluble and infusible cured epoxy resin composition which comprises the reaction product of an epoxy resin of the oxirane structure and having an oxirane epoxy equivalency greater than 1.0, from about 0.05 to about 1.5 parts by weight per part of the epoxy resin of a polyamine curing agent having more than one non-tertiary amino group per molecule and selected from the group consisting of aromatic polyamines, aliphatic polyamines, and cycloaliphatic polyamines, and from about 0.005 to about 0.1 mole per 100 parts of the epoxy resin of an accelerator of the general formula: ##EQU6## wherein R is ##SPC4## R 2 is selected from the group consisting of an alkyl group containing from 1 to 4 carbon atoms, chlorine and bromine, n is 0, 1 or 2, and R 1 is selected from the group consisting of R and H.
Claim 10
Dependent Claim
141 words
An insoluble and infusible cured epoxy resin composition which comprises the reaction product of an epoxy resin of the oxirane structure and having an oxirane epoxy equivalency greater than 1.0, from about 0.05 to about 1.5 parts by weight per part of the epoxy resin of a polyamine curing agent having more than one non-tertiary amino group per molecule and selected from the group consisting of aromatic polyamines, aliphatic polyamines, and cycloaliphatic polyamines, and from about 0.005 to about 0.1 mole per 100 parts of the epoxy resin of an accelerator of the general formula: ##EQU6## wherein R is ##SPC4## R 2 is selected from the group consisting of an alkyl group containing from 1 to 4 carbon atoms, chlorine and bromine, n is 0, 1 or 2, and R 1 is selected from the group consisting of R and H.
Claim 11
Dependent Claim
16 words
A composition as in claim 8 wherein the epoxy resin is a diglycidyl ether of 2,2-bis(4-hydroxyphenyl)propane.
Claim 12
Dependent Claim
14 words
A composition as in claim 8 wherein the polyamine curing agent is isophrone diamine.
Claim 13
Dependent Claim
12 words
A composition as in claim 8 wherein the accelerator is phenyl urea.
Claim 14
Dependent Claim
12 words
A composition as in claim 8 wherein the accelerator is 1,3-diphenyl urea.
References Cited (Backward Citations)
US3294749A
Cited
US3759914A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |