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US4535170A Expired / Lapsed US ⏱️ 0.0 years remaining

Flame retardants and compositions containing them

Assignee: Albemarle Corp
•
Filing: 1980-09-21
•
Granted: 1985-08-13
•
Expires: 2000-09-21
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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 04:37
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: 6
Claim 1
Independent Claim 39 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 R represents an alkylene radical of 2 to 18 carbon atoms.
Claim 2
Dependent Claim 39 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 R represents an alkylene radical of 2 to 18 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 20 words
A bisimide as claimed in claim 2 in which R is an alkylene radical of 2 to 6 carbon atoms.
Claim 5
Dependent Claim 10 words
A bisimide as claimed in claim 3 which is N,N'-(1,2-ethylene)-bis[3,4,5,6-tetrabromophthalimide].
Claim 6
Dependent Claim 10 words
A bisimide as claimed in claim 3 which is N,N'-(1,4-tetramethylene)-bis[3,4,5,6-tetrabromophthalimide].

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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) 1988-08-12 1989-02-11 1989-08-13 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1992-08-12 1993-02-11 1993-08-13 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1996-08-12 1997-02-11 1997-08-13 $7700.00 Window Closed / Lapsed

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