Patent US3988257A successfully refreshed from Google Patents.
US3988257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epoxy resin accelerator
Assignee: Shell USA Inc
•
Filing: 1975-09-29
•
Granted: 1976-10-26
•
Expires: 1995-09-29
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.
Inventors
- 👤 Tony Harrison
- 👤 Roger G. Weatherhead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:27
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/68; C08G59/686
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
87 words
A curing composition for curing epoxy resins having an epoxy equivalency greater than 1.0 which comprises a mixture of (1) an accelerator of the general formula: ##EQU2## 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, and (2) a polyamine curing agent having more than one non-tertiary amino group per molecule.
Claim 2
Dependent Claim
87 words
A curing composition for curing epoxy resins having an epoxy equivalency greater than 1.0 which comprises a mixture of (1) an accelerator of the general formula: ##EQU2## 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, and (2) a polyamine curing agent having more than one non-tertiary amino group per molecule.
Claim 3
Dependent Claim
14 words
A composition as in claim 1 wherein said polyamine curing agent is isophorone diamine.
Claim 4
Dependent Claim
12 words
A composition as in claim 1 wherein said accelerator is phenyl urea.
Claim 5
Dependent Claim
12 words
A composition as in claim 1 wherein said 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) | 1979-10-26 | 1980-04-26 | 1980-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-26 | 1984-04-26 | 1984-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-26 | 1988-04-26 | 1988-10-26 | $7700.00 | Window Closed / Lapsed |