The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 16, 1990
Filed:
Aug. 26, 1987
Paul N Chen, Sr, Gillette, NJ (US);
Tai-Shung Chung, Morris Plains, NJ (US);
Paul J Harget, West Milford, NJ (US);
Hoechst Celanese Corp., Somerville, NJ (US);
Abstract
A novel miscible composition comprising from about 5 parts by weight to about 95 parts by weight of a polyarylate and from about 95 parts by weight to about 5 parts by weight of an aromatic polybenzimidazole. In a composition mostly comprised of an aromatic polybenzimidazole, it is preferred that the polyarylate be present in the composition in an amount sufficient to make the aromatic polybenzimidazole more thermally processable and also less susceptible to moisture. More preferably, such compositions are comprised of from about 60 parts by weight to about 95 parts by weight of an aromatic poloybenzimidazole and from about 40 parts by weight to about 5 parts by weight of a polyarylate. Most preferably, such compositions are comprised of at least about 10 parts by weight of a polyacrylate. In a composition mostly comprised of a polyarylate, it is preferred that the aromatic polybenzimidazole be present in an amount sufficient to render the polyarylate less sensitive to solvents, and to increase the thermal stability of the polyarylate. Preferably, the aromatic polybenzimidazole is present in such compositions in an amount sufficient to result in a composition with greatly enhanced solvent resistance. More preferably, such compositions are comprised of from about 60 parts by weight to about 95 parts by weight of a polyarylate and from about 40 parts by weight to about 5 parts by weight of an aromatic polybenzimidazole. Most preferably, such compositions should contain at least about 25 to about 30 parts by weight of a polybenzimidazole in order to render the polyarylate component much more resistant to solvents at room temperature. In addition to improving solvent resistance, greater amounts of aromatic polybenzimidazole in the composition substantially increase the thermal and physical properties of the composition, giving excellent price-performance characteristics. The compositions, particularly in the form of films or fibers, may be post-treated with heat or sulfuric acid in order to minimize their shrinkage when subsequently subjected to heat and in order to increase their resistance to solvents and acid.