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US4861882A
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Ethynyl terminated imidothioethers and resins therefrom
Assignee: National Aeronautics and Space Administration
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Filing: 1988-07-14
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Granted: 1989-08-29
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Expires: 2008-07-14
Abstract
Abstract Ethynyl terminated imidothioethers (ETIs) are prepared by the reaction of a dimercaptan, such as 4,4'-dimercaptodiphenyl ether, and an ethynyl containing maleimide, such as N-(3-ethynylphenyl)maleimide. Blends of thse ETIs and ethynyl terminated polymeric materials, such as ethynyl terminated sulfones and ethynyl terminated arylene ethers, are also prepared. These resin blends exhibit excellent processability, and the cured blends show excellent fracture toughness and solvent resistance, as well as excellent adhesive and composite properties.
Inventors
- 👤 Paul M. Hergenrother
- 👤 John W. Connell
- 👤 R. Gerald Bass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:36
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/20; C08G65/00; C08G65/34; C08G65/48; C08G73/00; C08G73/06; C08G73/10; C08G73/12; C08G73/125; C08G73/128
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
107 words
An ethynyl terminated imidothioether having the following structural formula ##STR8## wherein R is selected from the group of divalent radicals consisting of CH 2 CH 2 , CH 2 CH 2 CH 2 , CH 2 CH 2 CH 2 CH 2 CH 2 , CH 2 OCH 2 OCH 2 , ##STR9## wherein X is a bond, or X represents a member selected from the group consisting of CH 2 , O, S, C(CH 3 ) 2 , C(CF 3 ) 2 , SO 2 , and O═C; the ethynyl terminated imidothioether being formed as a mixture of stereoisomers comprising the d, l, and meso forms.
Claim 2
Dependent Claim
107 words
An ethynyl terminated imidothioether having the following structural formula ##STR8## wherein R is selected from the group of divalent radicals consisting of CH 2 CH 2 , CH 2 CH 2 CH 2 , CH 2 CH 2 CH 2 CH 2 CH 2 , CH 2 OCH 2 OCH 2 , ##STR9## wherein X is a bond, or X represents a member selected from the group consisting of CH 2 , O, S, C(CH 3 ) 2 , C(CF 3 ) 2 , SO 2 , and O═C; the ethynyl terminated imidothioether being formed as a mixture of stereoisomers comprising the d, l, and meso forms.
Claim 3
Dependent Claim
22 words
An ethynyl terminated imidothioether according to claim 1 which is produced by the reaction of a dimercaptan and an ethynyl containing maleimide.
Claim 4
Dependent Claim
21 words
An ethynyl terminated imidothioether according to claim 2, wherein the dimercaptan is 4,4'-dimercaptodiphenyl ether and the ethynyl containing maleimide in N-(3-ethynylphenyl)maleimide.
References Cited (Backward Citations)
US4365068A
Cited
US4282347A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-28 | 1993-02-27 | 1993-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-28 | 1997-02-27 | 1997-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-28 | 2001-02-27 | 2001-08-29 | $7700.00 | Window Closed / Lapsed |