Patent ID: 7834130
Filing Date: 2010-11-16
Classification: C08G

Abstract:
1. A single-stage melt polymerization process for production of polybenzimidazole which comprises the steps of: providing a high intensity reactor having a means for controlling atmosphere and temperature; degassing said high intensity reactor and filling with nitrogen; providing a tetraminobiphenyl (TAB), compound A; providing an isophthalic acid (IPA), compound B; charging a high intensity reactor with compounds A and B; reacting compound A and compound B under high intensity agitation and in an absence of catalyst while heating to a temperature of between 340° to 430° C. to produce a polybenzimidazole having an IV average of at least 0.45 dL/g and a PV of greater than or equal to 1.0 g/cm