US3909475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mouldable composition based on thermosetting resin
Assignee: Rhone Poulenc SA
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Filing: 1973-11-05
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Granted: 1975-09-30
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Expires: 1993-11-05
Abstract
Abstract A mouldable composition is provided which comprises (a) a prepolymer having a softening point from 50* to 220*C. produced from an N,N''-bis-imide of the general formula: in which D represents a divalent organic radical containing an olefinic carbon-carbon double bond and A represents a divalent radical possessing 2 to 30 carbon atoms, and a polyamine of the general formula:
Inventors
- 👤 Charles Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:20
CPC Classifications
C; C08; C08L; C08L79/00; C08L79/04; C08L79/08; C08L79/085
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
27 words
IN A MOLUDABLE COMPOSITION WHICH CONSISTS ESSENTIALLY OF (A) A PRPOLYMER, HAVING A SOFTENING POINT FROM 50 TO 220*C. PRODUCED FROM AN N,N''-BIS-IMIDE OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
27 words
IN A MOLUDABLE COMPOSITION WHICH CONSISTS ESSENTIALLY OF (A) A PRPOLYMER, HAVING A SOFTENING POINT FROM 50 TO 220*C. PRODUCED FROM AN N,N''-BIS-IMIDE OF THE GENERAL FORMULA:
Claim 3
Dependent Claim
12 words
A composition according to claim 1, in which the bis-imide is N,N''-4,4''-diphenylmethane-bis-maleimide.
Claim 4
Dependent Claim
12 words
A composition according to claim 1, in which the polyamine is 4,4''-diamino-diphenylmethane.
Claim 5
Dependent Claim
23 words
A composition according to claim 1, in which the filler represents 10 to 75% by weight of the mixture of prepolymer and filler.
Claim 6
Dependent Claim
14 words
A composition according to claim 1, in which the initiator is an organic peroxide.
Claim 7
Dependent Claim
27 words
A composition according to claim 1, in which the filler consist of graphite, metal, mica, molybdenum sulphide or polytetrafluoroethylene particles, glass microspheres, or asbestos or glass fibres.
Claim 8
Dependent Claim
65 words
Process for the preparation of a composition as defined in claim 1, which comprises suspending the initiator in the organosilicon oil or the oil/resin mixture at a temperature close to or above the melting point of the initiator but below its decomposition temperature, and then mixing this suspension with the prepolymer and filler heated to a temperature substantially equal to the temperature of the suspension.
Claim 9
Dependent Claim
14 words
Process according to claim 7, in which the temperature is between 50* and 80*C.
Claim 10
Dependent Claim
34 words
A process for preparing a moulded article with comprises moulding a composition as defined in claim 1, at a temperature above the softening point of the prepolymer and the decomposition temperature of the initiator.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |