Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Reexamination Certificate
2006-05-02
2006-05-02
Hightower, P. Hampton (Department: 1711)
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
07038007
ABSTRACT:
A process for a single-stage melt polymerization for the production of a high molecular weight polybenzimidazole which comprises the steps of: providing a reaction vessel having a means for agitation and a means for vacuum; charging the reaction vessel with reactants selected from: (A) a tetraaminiobiphenyl (TAB), and (B) a diphenyl isophthalate (DPIP); reacting the reactants under constant agitation and under a vacuum with an inert gas sweep; maintaining a reactant temperature which does not exceed 290° C. under constant agitation allowing pressure in the vessel to increase, with an inert gas sweep until a phase change is achieved, when the temperature reaches 250° C. pressure is increased to a slight positive pressure; and increase the reactant temperature and pressure within said reaction vessel while maintaining constant agitation and inert gas sweep, while maintaining a slight positive pressure. Preferably the vessel used in the instant invention is a high intensity reaction vessel.
REFERENCES:
patent: 3509108 (1970-04-01), Prince
patent: 4312976 (1982-01-01), Choe
patent: 4588808 (1986-05-01), Ward
patent: 4672104 (1987-06-01), Ward
patent: 2006/0004181 (2006-01-01), Dawkins et al.
patent: 2006/0004182 (2006-01-01), Dawkins et al.
Baker J. Dean
Dawkins Bobby G.
Joiner Rita H.
Hammer & Hanf, P.C.
Hampton Hightower P.
PBI Performance Products, Inc.
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