Stable solution of polybenzimidazole and polysulfons blends
AssigneeHoechst Celanese Corporation
InventorsTai-Shung Chung, Arthur G. Schlask, Dieter Kurschus
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Abstract
A stable solution of polybenzimidazole resin containing from approximately 10 to approximately 35 weight percent of resins and from approximately 65 to approximately 90 weight percent of a suitable solvent, the resins consist of from approximately 70 to approximately 95 weight percent of polybenzimidazole and from approximately 5 to approximately 30 weight percent of polysulfone, wherein the solution is substantially free of organic salt. The solution is useful for the production of films, fibers and molded articles exhibiting enhanced mechanical properties.
Claims20
A stable solution of polybenzimidazole resin consisting of from approximately 10 to approximately 35 weight percent of resin and from approximately 65 to approximately 90 weight percent of a suitable solvent, based on the total weight of the solution, the resin consisting of from approximately 70 to approximately 95 weight percent of polybenzimidazole and from approximately 5 to approximately 30 weight percent of polysulfone, based on the total weight of the resins present in the solution, wherein the solution is substantially free of organic salts.
A fiber prepared from a stable solution of polybenzimidazole resin consisting of from approximately 5 to approximately 30 weight percent of the resin and from approximately 70 to approximately 95 weight percent of a suitable solvent, based on the total weight of the solution, the resin component consisting essentially of from approximately 70 to approximately 95 weight percent of polybenzimidazole resin and from approximately 5 to approximately 30 weight percent of polysulfone resin, based on the total weight of resins present in the solution, wherein the resins solution is substantially free of organic salts, by the process of:
- (a) preparing a stable solution of polybenzimidazole resin consisting of from approximately 10 to approximately 35 weight percent of resin and from approximately 65 to approximately 90 weight percent of a suitable solvent, based on the total weight of the solution, the resin consisting of from approximately 70 to approximately 95 weight percent of polybenzimidazole and from approximately 5 to approximately 30 weight percent of polysulfone, based on the total weight of resins present in the solution, wherein the solution is substantially free of organic salts;
- (b) extruding a fiber from the solution under substantially moisture-free conditions;
- (c) evaporating the solvent from the fiber;
- (d) washing the fiber with a non-solvent;
- and
- (e) drying the fiber at a low temperature
- wherein the fiber exhibits enhanced elongation and sulfur weight gain.
Dependencies are inferred from the claim text.