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. 21, 1989
Filed:
Oct. 20, 1988
Elie Ahad, Ste-Foy, CA;
Abstract
The invention disclosed is a process for the preparation of branched hydroxy-terminated aliphatic polyethers having alkyl azide substituents, having a structural formula ##STR1## and a molecular weight of abotu 500 to 40,000, and a process for the preparation thereof which comprises the single step of reacting a solid rubbery polyepichlorohydrin (PECH) of molecular weight of about 0.5-5.0.times.10.sup.6 with epichlorohydrin monomer (ECH) and an ionic azide selected from the group consisting of sodium azide, lithium azide and potassium azide, in a suitable organic solvent at elevated temperature, while agitating. According to a further aspect of the invention, the molecular weight of the polyether product may be controlled by adjusting the weight ratio of ECH:PECH, while maintaining a weight ratio of ionic azide: (ECH+PECH) of about 1:1.