Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Reexamination Certificate
2007-02-22
2010-11-16
Truong, Duc (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
C528S310000, C528S335000, C528S336000, C528S337000, C528S339000, C528S340000, C528S342000, C528S348000, C528S353000
Reexamination Certificate
active
07834130
ABSTRACT:
A single-stage melt polymerization process is demonstrated for production of a polybenzimidazole which comprises the following steps. First, a high intensity reactor having a means for controlling agitation and rate of, atmosphere, and temperature is provided. Second, the high intensity reactor is degassed and filled with nitrogen. Third, a tetraminobiphenyl (TAB), compound A and an isophthalic acid (IPA), compound B are provided. Fourth, the high intensity reactor is charged with compounds A and B. Fifth, compound A and compound B are reacted under high intensity agitation in an absence of catalyst, to temperature of between 340° C. to 430° C. to produce a polybenzimidazole having an IV of at least 0.45 and a plugging value of greater than or equal to 1.0 g/cm2.
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Baker J. Dean
Dawkins Bobby G.
Hammer & Associates, P.C.
PBI Performance Products, Inc.
Truong Duc
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