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. 14, 1992
Filed:
Apr. 05, 1991
Elie Ahad, Ste-Foy, CA;
Abstract
The invention disclosed relates to novel branched chain hydroxy-terminated aliphatic azido polymers and copolymers with variable molecular weight (MW) and a single step method for the preparation thereof which involves respectively reacting a high (MW) 0.5-5.0.times.10.sup.6) solid rubbery polyepichlorohydrin (PECH) homopolymer and epichlorohydrin/alkylene oxide copolymer (PEEC), with an alkali metal azide in a suitable organic solvent, in the presence of an initiator at elevated temperature. The MW of the azido product may be controlled by including the reaction mixture a basic degradation catalyst (such as LiOCH.sub.3 or NaOH) and varying the amount of catalyst. When the reaction is catalyzed, the MW of the product varies within the range 1,000-40,000 and the hydroxyl functionality is 2-10. Uncatalyzed reactions yield products with MW between 40,000 and 200,000 and a functionality of about 10. The branched azido polymers and copolymers yield energetic binders with improved mechanical properties and thermal stability which are useful in rocket propellants and composite explosives formulations.