Patent US3752790A successfully refreshed from Google Patents.
US3752790A
Expired / Lapsed
US
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Chlorinated toluenediamine curing agents for use in preparing polyurethane elastomers and foams
Assignee: EIDP Inc
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Filing: 1971-05-19
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Granted: 1973-08-14
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Expires: 1991-05-19
Abstract
Abstract AMINE CURING AGENTS, FOR LIQUID POLYURETHANES HAVING FREE ISOCYANATE END-GROUPS, SUCH AS 3-CHLORO-2,6-TOLUENEDIAMINE, 3-CHLORO-2,4-TOLUENEDIAMINE, 3,5 - DICHLORO-2,4TOLUENEDIAMINE, 3,5-DICHLORO-2,6-TOLUENEDIAMINE, 5,6-DICHLORO - 2,4 - TOLUENEDIAMINE AND 5-CHLORO-2,4-TOLUENEDIAMINE AND A PROCESS FOR CURING THESE POLYURETHANES. THESE AMINES GENERALLY POSSESS SUITABLE REACTIVITIES FOR USE IN CURING BOTH POLYURETHANE ELASTOMERS AND FOAMS. BY THE PROPER CHOICE OF THE CHLORINATED TOLUENEDIAMINES AND/OR THEIR MIXTURES, CURING RATES OF THE FORMULATIONS AND CERTAIN PHYSICAL PROPERTIES OF THE CURED POLYURETHANES (E.G. THEIR HARDNESS AND MODULUS) CAN BE CONTROLLED OVER A WIDE RANGE.
Inventors
- 👤 J Verbanc
- 👤 H Mcshane Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:12
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G2110/00; C08G2110/0008; C08G2110/0016; C08G2110/0025; C08G2110/0033; C08G2110/0041
Claims Analysis
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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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |