Patent US3948825A successfully refreshed from Google Patents.
US3948825A
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Curing agent for use in making cellular polyurethane compositions
Assignee: BASF Corp
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Filing: 1974-07-05
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Granted: 1976-04-06
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Expires: 1994-07-05
Abstract
Abstract By reacting a proper proportion of an alkylene oxide with methylene dianiline (MDA), there is obtained a curing agent or cross-linking agent useful in place of methylene-bis-orthochloro aniline (MOCA) for making polyurethane foams. The invention provides a solution to the problem of finding a substitute for MOCA, which has become suspected as a carcinogen.
Inventors
- 👤 Edward R. Pray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:18
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6681; C08G18/6688; C08G18/30; C08G18/32; C08G18/3271; C08G18/329; F; F02; F02P; F02P9/00; F02P9/002; F02P9/007
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
29 words
A reaction product of methylene dianiline with 0.7 to 2.5 times as many moles of an alkylene oxide selected from the group consisting of ethylene oxide and propylene oxide.
Claim 2
Dependent Claim
29 words
A reaction product of methylene dianiline with 0.7 to 2.5 times as many moles of an alkylene oxide selected from the group consisting of ethylene oxide and propylene oxide.
Claim 3
Dependent Claim
28 words
A composition as defined in claim 1, said composition being a reaction product of methylene dianiline with about 1 to 2 times as many mols of propylene oxide.
Claim 4
Dependent Claim
46 words
In the making of a polyurethane composition, the improvement comprising the use as a curing agent of a reaction product of methylene dianiline with 0.7 to 2.5 times as many moles of an alkylene oxide selected from the group consisting of ethylene oxide and propylene oxide.
Claim 5
Dependent Claim
46 words
In the making of a polyurethane composition, the improvement comprising the use as a curing agent of a reaction product of methylene dianiline with 0.7 to 2.5 times as many moles of an alkylene oxide selected from the group consisting of ethylene oxide and propylene oxide.
Claim 6
Dependent Claim
30 words
An improvement as defined in claim 3, wherein said curing agent is a reaction product of methylene dianiline with about 1 to 2 times as many mols of propylene oxide.
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) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |