US3717596A
Expired / Lapsed
US
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Carbodiimide foams and process for preparing carbodiimide foams from cocatalyst systems
Assignee: BASF Corp
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Filing: 1971-08-05
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Granted: 1973-02-20
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Expires: 1991-08-05
Abstract
Abstract RIGID CELLULAR FOAM COMPOSITIONS CHARACTERIZED BY CARBODIIMIDE LINKAGES ARE PREPARED BY CATALYTICALLY CONDENSING AN ORGANIC POLYISOCYANATE IN THE PRESENCE OF 2,4, 6-TRIS(N-METHYLETHANOLAMINO)-S-TRIAZINE OR, ALTERNATIVELY, IN THE PRESENCE OF A CO-CATALYST SYSTEM OF (A) 2,4,6TRIS(N-METHYLETHANOLAMINO)-S-TRIAZINE AND (B) CATALYST SELECTED FROM THE GROUP CONSISTING OF (1) 1,3,5-TRIS(N, N-DIALKYLAMINOALKYL)-S-HEXAHYDROTRIAZINE, (2) 2,4,6-TRIS (DIMETHYLAMINOETHYL) PHENOL, (3) O-, P-, AND A MIXTURE OF O- AND P-DIMETHYLAMINOMETHYLPHENOL, AND (4) AN ORGANOTIN COMPOUND.
Inventors
- 👤 J Patton
- 👤 P Kan
- 👤 M Cenker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:41
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/20; C08G18/2009; C08G18/2036; C08G18/02; C08G18/025; C08G18/10; C08G2110/00; C08G2110/0025; C08G2110/0041; C08G2115/00; C08G2115/06; Y; Y10; Y10S; Y10S521/00; Y10S521/902; Y10S521/903
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-02-20 | 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 |