Patent US4564663A successfully refreshed from Google Patents.
US4564663A
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Free radical cure of the bismaleimide of dimer diamine
Assignee: United States Department of the Navy
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Filing: 1985-02-21
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Granted: 1986-01-14
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Expires: 2005-02-21
Abstract
Abstract Free radical cure of the bismaleimide of dimer diamine is accomplished withydroperoxides promoted with a vanadium trineodecanoate/N,N-dimethyl-p-toluidine mixture to form a hard polymer.
Inventors
- 👤 Eugene C. Martin
- 👤 Albert A. De Fusco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:12
CPC Classifications
C; C08; C08F; C08F22/00; C08F22/36; C08F22/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
51 words
The free radical cure of the bismaleimide of dimer diamine comprising the steps of: mixing a promoter solution with said bismaleimide to form a first mixture; adding a hydroperoxide to said first mixture to form a second mixture; degassing said second mixture; purging said second mixture; and heating said second mixture.
Claim 2
Dependent Claim
51 words
The free radical cure of the bismaleimide of dimer diamine comprising the steps of: mixing a promoter solution with said bismaleimide to form a first mixture; adding a hydroperoxide to said first mixture to form a second mixture; degassing said second mixture; purging said second mixture; and heating said second mixture.
Claim 3
Dependent Claim
15 words
The cure of claim 1 wherein said promoter solution comprises vanadium trineodecanoate, N,N-dimethyl-p-toluidine and xylene.
Claim 4
Dependent Claim
11 words
The cure of claim 1 wherein said hydroperoxide is cumene hydroperoxide.
Claim 5
Dependent Claim
30 words
The cure of claim 3 wherein said second mixture has the following composition by weight: 0.0014-0.0028 parts promoter solution per part bismaleimide and 0.011 parts cumene hydroperoxide per part bismaleimide.
Claim 6
Dependent Claim
10 words
The cure of claim 1 wherein said hydroperoxide is t-butylhydroperoxide.
Claim 7
Dependent Claim
29 words
The cure of claim 5 wherein said second mixture has the following composition by weight: 0.0028-0.0050 parts promoter solution per part bismaleimide and 0.011-0.022 parts t-butylhydroperoxide per part bismaleimide.
Claim 8
Dependent Claim
16 words
The cure of claim 1 wherein said purging step is carried on with an inert gas.
Claim 9
Dependent Claim
15 words
The cure of claim 1 wherein said heating step is carried on at 80°-100° C.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-13 | 1989-07-15 | 1990-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-13 | 1993-07-15 | 1994-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-13 | 1997-07-15 | 1998-01-14 | $7700.00 | Window Closed / Lapsed |