Patent US3717612A successfully refreshed from Google Patents.
US3717612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Curable epoxy resin composition containing a substituted diurea compound
Assignee: BP Chemicals Hitco Inc
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Filing: 1970-06-22
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Granted: 1973-02-20
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Expires: 1990-06-22
Abstract
Abstract An improved curing agent for epoxy resin compositions containing a polyepoxide comprising a substituted diurea formed by the reaction of two mols of a secondary amine, preferably an aliphatic amine, such as dimethylamine with one mol of a diisocyanate containing one cycloaliphatic isocyanate group and one aliphatic isocyanate group such as isophorone diisocyanate. The curing temperature of the composition can be substantially increased to provide products having improved properties without the danger of undercuring or substantial shortening of the gel time.
Inventors
- 👤 E Babayan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:47
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/4007; C08G59/4014; C08G59/4021
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
37 words
A curable composition of matter comprising a polyepoxide resin containing a plurality of reactive 1,2- epoxy groups and 1 to 10 parts per hundred parts by weight of said resin of a curing agent of the formula:
Claim 2
Dependent Claim
37 words
A curable composition of matter comprising a polyepoxide resin containing a plurality of reactive 1,2- epoxy groups and 1 to 10 parts per hundred parts by weight of said resin of a curing agent of the formula:
Claim 3
Dependent Claim
30 words
A composition according to claim 1 further including less than five parts by weight per hundred parts of said resin of tertiary amine salts of an Alpha -oxy substituted acid.
Claim 4
Dependent Claim
30 words
A composition according to claim 1 further including 0.3 to 10 parts of curing promoters or accelerators selected from the group consisting of tertiary amines and weakly acidic amphoteric compounds.
Claim 5
Dependent Claim
12 words
A composition According to claim 3 in which said compound is dicyandiamide.
Claim 6
Dependent Claim
21 words
A composition according to claim 1 in which the polyepoxide is polyglycidyl ether having an epoxy equivalency from 1 to 2.
Claim 7
Dependent Claim
17 words
A composition according to claim 5 in which the polyepoxide is a diglycidyl ether of 2,2-bis(4-hydroxyphenyl) propane.
Claim 8
Dependent Claim
14 words
A composition according to claim 1 in which n is an integer from 6-8.
Claim 9
Dependent Claim
18 words
A composition according to claim 7 in which the curing agent is selected from compounds of the formula:
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |