Patent US3925324A successfully refreshed from Google Patents.
US3925324A
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Process for the preparation of thermosetting polymers from n,n-bis-maleimide
Assignee: Rhone Poulenc SA
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Filing: 1972-12-20
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Granted: 1975-12-09
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Expires: 1992-12-20
Abstract
Abstract The present invention relates to a continuous process for the preparation of thermosetting polymers possessing imide groups, by heating an N,N''-bis-maleimide and bis-(4-amino-phenyl)-methane at a temperature between 95* and 250*C., in which the bis-maleimide, as a particulate solid, and the diamine, in the molten state, are introduced separately into a kneader equipped with an extrusion screw.
Inventors
- 👤 Bernard Gerard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:09
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/12; C08G73/121
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
75 words
IN A CONTINUOUS PROCESS FOR THE PREPARATION OF A THERMOSETTING PREPOLYMER BY HEATING A MIXTURE OF AN N,N''-DIS-MALEIMIDE AND BIS-(4-AMINO-PHENYL)-METHANE AT A TEMPERATURE BETWEEN 95* AND 250:C., THE IMPROVEMENT WHEREIN THE BISMALEIMIDE, AS A PERTICULATE SOLID, AND THE DIAMINE, IN THE MOLTEN STATE, ARE MIXED BY INTRODUCING SEPARATELY INTO A KNEADER EQUIPPED WITH AN EXTRUSION SCREW, THE MOLAR RATIO OF BIS:MALEIMIDE TO DIAMINE BEING FROM 1 TO 5, ADVANCING POLYMERISING AND COLLECTING THE EXTRUDED PREPOLYMER.
Claim 2
Dependent Claim
75 words
IN A CONTINUOUS PROCESS FOR THE PREPARATION OF A THERMOSETTING PREPOLYMER BY HEATING A MIXTURE OF AN N,N''-DIS-MALEIMIDE AND BIS-(4-AMINO-PHENYL)-METHANE AT A TEMPERATURE BETWEEN 95* AND 250:C., THE IMPROVEMENT WHEREIN THE BISMALEIMIDE, AS A PERTICULATE SOLID, AND THE DIAMINE, IN THE MOLTEN STATE, ARE MIXED BY INTRODUCING SEPARATELY INTO A KNEADER EQUIPPED WITH AN EXTRUSION SCREW, THE MOLAR RATIO OF BIS:MALEIMIDE TO DIAMINE BEING FROM 1 TO 5, ADVANCING POLYMERISING AND COLLECTING THE EXTRUDED PREPOLYMER.
Claim 3
Dependent Claim
56 words
A process according to claim 1, the improvement wherein the bis-maleimide and diamine are introduced separately into a kneader which comprises a helical feed screw having an interrupted thread, which screw simultaneously executes an axial rotational and oscillating movement provided in a housing equipped with teeth adapted to co-operate with the interrupted vanes of the screw.
Claim 4
Dependent Claim
20 words
A process according to claim 1, the improvement wherein the diamine is introduced downstream from where the bis-maleimide is introduced.
Claim 5
Dependent Claim
20 words
A process according to claim 1, the improvement wherein the diamine is preheated to a temperature from 100* to 130*C.
Claim 6
Dependent Claim
20 words
A process according to claim 1, the improvement wherein the bis-maleimide has a particle size from 0.1 to 5 mm.
Claim 7
Dependent Claim
13 words
A process according to claim 1, the improvement wherein the bis-maleimide is N,N''-4,4''-diphenylmethane-bis-maleimide.
References Cited (Backward Citations)
US3562223A
Cited
US3669930A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |