Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1991-03-27
1994-03-01
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525435, 525436, C08L 7906, C08L 7706, C08G 7308
Patent
active
052908844
ABSTRACT:
A novel miscible blend of component polymers comprised of from about 5 weight percent to about 95 weight percent of a polybenzimidazole and from about 95 weight percent to about 5 weight percent of an aromatic polyamide, aromatic polyamide-hydrazide or aromatic polyamide containing heterocyclic linkages. Miscibility of the component polymers of the blend is indicated by infrared, X-Ray and Differential Scanning Calorimetry analyses and scanning electron photomicrographs. In a film or molded article of a blend mostly comprised of a polybenzimidazole, it is preferred that the aromatic polyamide, aromatic polyamide-hydrazide or aromatic polyamide containing heterocyclic linkages be present in the blend in an amount sufficient to result in a blend with improved tensile properties compared to the polybenzimidazole and that is more thermally processable than the polybenzimidazole. In a blend mostly comprised of an aromatic polyamide, aromatic polyamide-hydrazide or aromatic polyamide containing heterocyclic linkages, it is preferred that the polybenzimidazole be present in the blend in an amount sufficient to result in a blend with increased thermal stability and nonflammability compared to the aromatic polyamide, aromatic polyamide-hydrazide or aromatic polyamide containing heterocyclic linkages. The blends, particularly in the form of films or molded articles, may be post-treated with heat or sulfonating agent in order to minimize their shrinkage when subsequently subjected to heat and in order to increase their resistance to solvents and acids.
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Chemical Abstracts (HOST STN), vol. 113, No. 8, 20th Aug. 1990, Abstract No. 60375n, M. M. Iovleva et al, "Upper & Lower Critical Temperature of Mixing of Solutions of Rigid-Chain Aromatic Polyamides".
CA 69: 52486g.
CA 83: 60353r.
CA 85: 178022b.
CA 84: 5428q.
CA 85: 109137f.
Calundann Gordon W.
Chenevey Edward C.
Chung Tai-Shung
Herold Friedrich
Hampton-Hightower P.
Hoechst Celanese Corp.
Kight III John
Mazzarese Joseph M.
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