Patent US4173595A successfully refreshed from Google Patents.
US4173595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermosetting composition from bis-imide, N-vinyl pyrrolidone and unsaturated polyester
Assignee: Rhone Poulenc Industries SA
•
Filing: 1978-01-05
•
Granted: 1979-11-06
•
Expires: 1998-01-05
Abstract
Abstract A thermosetting composition is disclosed characterized in that it comprises (by weight) from 60 to 90% of a bis-maleimide of the formula: ##STR1## in which A represents a divalent radical chosen from the group consisting of phenylene radicals and radicals of the formula: ##STR2## where T represents --CH 2 --, --C(CH 3 ) 2 --, --O-- or --SO 2 --; and from 10 to 40% of N-vinylpyrrolid-2-one. The preferred bis-maleimide is N,N'-(4,4'-diphenylmethane)-bis-maleimide. The composition may be modified by the addition of an unsaturated polyester. The composition is useful for the manufacture of molded articles or of articles having a cellular structure, or for the impregnation of electrical coils.
Inventors
- 👤 Max Gruffaz
- 👤 Jean-Louis Locatelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:29
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/10; H05B3/18; C; C08; C08F; C08F222/00; C08F222/36; C08F222/40; C08F299/00; C08F299/02; C08F299/04; C08F299/0478
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A thermosetting composition, characterized in that it consists essentially of, by weight: from 60 to 90% of a bis-maleimide of the formula: ##STR5## in which A represents a divalent radical chosen from the group consisting of phenylene radicals and radicals of the formula: ##STR6## where T represents --CH 2 --, --C(CH 3 ) 2 --, --O-- or --SO 2 --; and from 10 to 40% of N-vinylpyrrolid-2-one; and further modified by the addition of an unsaturated polyester in an amount representing from 5 to 60% of the weight of the mixture of the bis-maleimide and N-vinylpyrrolid-2-one, said unsaturated polyester being derived from at least one polycarboxylic acid derivative and at least one polyol, at least one of which contains olefinic unsaturation, with up to 60% by weight, based on the weight of the polyester composition, of an olefinically unsaturated monomer.
Claim 2
Dependent Claim
140 words
A thermosetting composition, characterized in that it consists essentially of, by weight: from 60 to 90% of a bis-maleimide of the formula: ##STR5## in which A represents a divalent radical chosen from the group consisting of phenylene radicals and radicals of the formula: ##STR6## where T represents --CH 2 --, --C(CH 3 ) 2 --, --O-- or --SO 2 --; and from 10 to 40% of N-vinylpyrrolid-2-one; and further modified by the addition of an unsaturated polyester in an amount representing from 5 to 60% of the weight of the mixture of the bis-maleimide and N-vinylpyrrolid-2-one, said unsaturated polyester being derived from at least one polycarboxylic acid derivative and at least one polyol, at least one of which contains olefinic unsaturation, with up to 60% by weight, based on the weight of the polyester composition, of an olefinically unsaturated monomer.
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) | 1982-11-05 | 1983-05-07 | 1983-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-05 | 1987-05-07 | 1987-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-05 | 1991-05-07 | 1991-11-06 | $7700.00 | Window Closed / Lapsed |