The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 14, 1978
Filed:
Feb. 07, 1977
Lionel T Wolford, Freehold, NJ (US);
Cities Service Company, Tulsa, OK (US);
Abstract
White N,N'-alkylene-bis-tetrabromophthalimides are prepared by reacting about two molar proportions of tetrabromophthalic anhydride with about one molar proportion of a diaminoalkane containing 2-6 carbon atoms in a solvent mixture having a boiling point of at least about 125.degree. C. and comprising about 50-97.5% by weight of a liquid aromatic hydrocarbon or halohydrocarbon having a boiling point of at least about 80.degree. C. and about 50-2.5% by weight of an alkanoic or aralkanoic acid having a dissociation constant not higher than about 6 .times. 10.sup.-5 at 25.degree. C. A preferred solvent is a mixture of about 70% by weight of xylenes and about 30% by weight of propionic acid having a boiling point of about 130.degree. C. The products are particularly useful as flame retardants.