US4644066A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame retardants and compositions containing them
Assignee: Albemarle Corp
•
Filing: 1985-05-15
•
Granted: 1987-02-17
•
Expires: 2005-05-15
Abstract
Abstract Flame retardants having good stability at the processing temperatures of high melting polymers are described. The flame retardants are halogen-containing bis-imides, for example, those of the formula ##STR1## R being defined in the specification.
Inventors
- 👤 Joseph Sonnenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:22
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/02; C07D209/44; C07D209/48; C07D209/56; C07D209/58; C07D209/70; C07D209/72; C07D209/76; C07D487/00; C07D487/02; C07D487/04; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3412; C08K5/3415; C08K5/3417
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
72 words
A bisimide compound of the formula ##STR5## wherein each X is independently bromine or hydrogen with the proviso that at least 4 of said X's are bromine, and wherein R represents a divalent organic radical selected from the group consisting of ##STR6## wherein R 9 represents oxygen or an alkylene radical containing from 1 to 4 carbon atoms and R 10 represents an alkylene radical containing from 1 to 4 carbon atoms.
Claim 2
Dependent Claim
72 words
A bisimide compound of the formula ##STR5## wherein each X is independently bromine or hydrogen with the proviso that at least 4 of said X's are bromine, and wherein R represents a divalent organic radical selected from the group consisting of ##STR6## wherein R 9 represents oxygen or an alkylene radical containing from 1 to 4 carbon atoms and R 10 represents an alkylene radical containing from 1 to 4 carbon atoms.
Claim 3
Dependent Claim
14 words
A bisimide as claimed in claim 1, in which each said X is bromine.
Claim 4
Dependent Claim
11 words
A bisimide as claimed in claim 1, which bisimide is N,N'-(p-phenylene)-bis[3,4,5,6-tetrabromophthalimide].
Claim 5
Dependent Claim
11 words
A bisimide as claimed in claim 1, which bisimide is N,N'-(methylene-di-p-phenylene)-bis[3,4,5,6-tetrabromophthalimide].
References Cited (Backward Citations)
CA765828A
Cited
CA664501A
Cited
CA682362A
Cited
CA787982A
Cited
FR825664A
Cited
US2408700A
Cited
US2547495A
Cited
GB681054A
Cited
US2657169A
Cited
US3078228A
Cited
US3138615A
Cited
GB928897A
Cited
AU296161A
Cited
US3129225A
Cited
US3179632A
Cited
GB973062A
Cited
US3331797A
Cited
US3340226A
Cited
US3354191A
Cited
US3313763A
Cited
GB1013786A
Cited
GB1004075A
Cited
US3316175A
Cited
US3208939A
Cited
US3275651A
Cited
GB1041868A
Cited
GB1064627A
Cited
GB1095677A
Cited
US3406148A
Cited
US3418263A
Cited
US3440248A
Cited
FR1470052A
Cited
GB1075420A
Cited
US3382207A
Cited
GB1100605A
Cited
GB1099096A
Cited
US3432450A
Cited
GB1191015A
Cited
GB1137592A
Cited
GB1145583A
Cited
GB1182709A
Cited
BE707726A
Cited
US3419576A
Cited
GB1173943A
Cited
US3455950A
Cited
DE1806584A1
Cited
US3714151A
Cited
US3574230A
Cited
US3574231A
Cited
US3590042A
Cited
US3673149A
Cited
DE1815404A1
Cited
US4550208A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |