Patent US3725354A successfully refreshed from Google Patents.
US3725354A
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US
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Use of mixed polyamines formed by the acid-catalyzed condensation of an n-alkylaniline, 2-chloroaniline, and formaldehyde as curing agents for polyurethanes
Assignee: Uniroyal Chemical Co Inc
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Filing: 1971-06-23
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Granted: 1973-04-03
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Expires: 1991-06-23
Abstract
Abstract The mixtures of polyamines formed by the acid-catalyzed condensation of an N-alkylaniline, 2-chloro-aniline, and formaldehyde in certain ratios have im-proved properties for curing polyurethanes. They are readily blended with the liquid polyurethane because they are liquid or have low solidification points. The properties of the cured polymer can be varied by selecting the proper curing agent, that is, those richer in N-alkylamiline providing softer products, or those richer in 2-chloroamiline providing harder products.
Inventors
- 👤 N Sundholm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:45
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
12 words
A composition as in claim 1 in which the N-alkylaniline is N-methylaniline.
Claim 2
Dependent Claim
12 words
A composition as in claim 1 in which the N-alkylaniline is N-ethylaniline.
Claim 3
Dependent Claim
12 words
A composition as in claim 1 in which the N-alkylaniline is N-isopropylaniline.
Claim 4
Dependent Claim
23 words
A composition as in claim 1 in which the said curing temperature is from 50* to 250*C., maintained for 1/2 to 48 hours.
References Cited (Backward Citations)
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Cited
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US3277173A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |