US4043986A
Expired / Lapsed
US
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Polymers possessing imide groups
Assignee: Rhone Poulenc Industries SA
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Filing: 1975-04-16
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Granted: 1977-08-23
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Expires: 1995-04-16
Abstract
Abstract Polymers possessing imide groups having excellent heat resistance and chemical inertness are disclosed. They are prepared by reacting cyanamide and a product possessing imide groups selected from: A. a bis-imide of the general formula: ##STR1## in which Q represents a divalent radical of the formula: ##STR2## WHEREIN Y represents H, CH 3 or Cl and m is 0 or 1, and A represents a divalent organic radical containing 2 to 30 carbon atoms; and B. a mixture comprising a said bis-imide and a mono-imide of the general formula: ##STR3## in which Q is as defined above and R represents a hydrogen atom or a monovalent organic radical containing 1 to 20 carbon atoms.
Inventors
- 👤 Max Gruffaz
- 👤 Gerard Lefebvre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:02
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
129 words
A process for preparing a polymer possessing imide groups, which consists essentially of reacting, at 50° to 300° C., cyanamide and a product possessing imide groups selected from the group consisting of: a. a bis-imide of the general formula: ##STR12## in which Q represents a divalent radical of the formula: ##STR13## wherein Y represents H, CH 3 or Cl and m is 0 or 1, and A represents a divalent organic radical containing 2 to 30 carbons atoms; and b. a mixture of said bis-imide and a mono-imide of the general formula: ##STR14## in which Q is as defined above and R represents a hydrogen, atom or a monovalent organic radical containing 1 to 20 carbon atoms, in amounts such that the ratio ##EQU2## is from 1 to 20.
Claim 2
Dependent Claim
129 words
A process for preparing a polymer possessing imide groups, which consists essentially of reacting, at 50° to 300° C., cyanamide and a product possessing imide groups selected from the group consisting of: a. a bis-imide of the general formula: ##STR12## in which Q represents a divalent radical of the formula: ##STR13## wherein Y represents H, CH 3 or Cl and m is 0 or 1, and A represents a divalent organic radical containing 2 to 30 carbons atoms; and b. a mixture of said bis-imide and a mono-imide of the general formula: ##STR14## in which Q is as defined above and R represents a hydrogen, atom or a monovalent organic radical containing 1 to 20 carbon atoms, in amounts such that the ratio ##EQU2## is from 1 to 20.
Claim 3
Dependent Claim
19 words
A cured resin having excellent heat resistance and chemical inertness obtained by a process as defined in claim 1.
Claim 4
Dependent Claim
17 words
A process according to claim 1, in which the ratio (r) is at least equal to 2.
Claim 5
Dependent Claim
16 words
A process according to claim 1, in which the ratio (r) is from 2.2 to 10.
Claim 6
Dependent Claim
36 words
A process according to claim 1, in which the number of imide groups supplied by the mono-imide represents up to 30% of the total number of imide groups supplied by the mixture of mono- and bis-imide.
Claim 7
Dependent Claim
12 words
A process according to claim 1, in which the bis-imide is N,N'-4,4'-diphenylmethane-bis-maleimide.
Claim 8
Dependent Claim
15 words
A process according to claim 1, in which the reaction is carried out in bulk.
Claim 9
Dependent Claim
26 words
A process according to claim 1, in which the reaction is carried out in an organic diluent having a boiling point from 50° to 300° C.
Claim 10
Dependent Claim
46 words
A process according to claim 1, in which an aromatic compound which possesses 2 to 4 benzene rings, which does not sublime at atmospheric pressure up to 250° C and which has a boiling point of at least 250° C is incorporated into the reaction mixture.
Claim 11
Dependent Claim
19 words
A prepolymer possessing a softening point not exceeding 250° C obtained by a process as defined in claim 1.
References Cited (Backward Citations)
US3669930A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |