Stable non-corrosive solution of polybenzimidazole suitable for

Details Stable non-corrosive solution of polybenzimidazole suitable for Stable non-corrosive solution of polybenzimidazole suitable for

1981-05-04

1982-03-23

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524234, 524394, 524104, 524166, 524173, C08K 534, C08K 536, C08K 517

Patent

active

043211828

ABSTRACT:
An improved solution of a polybenzimidazole suitable for use in the formation of shaped articles (e.g. fibers, films, and the like) is provided which includes a minor amount of an organo-lithium compound (as defined) which has been found to be capable of inhibiting the separation of the solution into phases of greater and lesser concentrations of the polybenzimidazole upon the passage of time. In a preferred embodiment the organo-lithium compound is lithium stearate. Not only is stability imparted to the solution prior to the formation of a shaped article, but the potential for catastrophic corrosive stress cracking of stainless steel equipment in contact with the solution is eliminated such as that which may occur following the extended use of the common prior art additive, lithium chloride.

REFERENCES:
patent: 3502606 (1970-03-01), Conciatore et al.
patent: 3763107 (1973-10-01), D'Alelio
patent: 3836500 (1974-09-01), Calundann et al.

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