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:
Jul. 13, 1976
Filed:
Dec. 14, 1973
Anthony B Conciatori, Chatham, NJ (US);
Rufus S Jones, Jr, Dover, NJ (US);
Celanese Corporation, New York, NY (US);
Abstract
An improved process is provided for the formation of BBB type polymer, i.e. poly(bisbenzimidazobenzophenanthroline) and related nitrogenous polymers, in finely divided form having an unusually high surface area. The condensation reaction of at least one organic tetra-amine and at least one tetracarboxylic acid (which optionally may be in the form of the corresponding half anhydride or dianhydride) is conducted at an elevated temperature with agitation in the presence of a major concentration of a liquid sulfone (e.g. diphenyl sulfone) which is inert under the reaction conditions. The resulting particulate product of BBB type polymer commonly exhibits a surface area of about 100 to 500, or more, square meters per gram, and may be used in the formation of pressure molded articles of high temperature resistance.