Stable non-corrosive solution of polybenzimidazole suitable for use in the formation of shaped articles
US4321182A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 4, 1981 |
| Grant date | Mar 23, 1982 |
| Priority date | — |
| Expiry date | May 4, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/098
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.