Stock material or miscellaneous articles – Self-sustaining carbon mass or layer with impregnant or...
Patent
1992-05-28
1994-01-11
Lusignan, Michael
Stock material or miscellaneous articles
Self-sustaining carbon mass or layer with impregnant or...
264 291, 4234474, 427399, B32B 900
Patent
active
052779815
ABSTRACT:
A process for enhancing the thermo-oxidation stability of a polybenzimidazole-containing article wherein the article contains from about 5 to about 100 weight percent of polybenzimidazole and from about 0 to about 95 weight percent of a thermoplastic polymer, by the steps of providing a phosphoric acid solution of about 2.0 to about 10.0 weight percent of acid; contacting the polybenzimidazole-containing article with the acid solution for sufficient time to produce an acid-treated article; drying the acid-treated article at a low temperature to remove excess acid; and heat treating the dried article at a temperature ranging from about 400.degree. to about 500.degree. C. in an inert atmosphere to form a phosphate barrier layer on the surface of the article, wherein the article retains at least about 50 percent of its weight after isothermal aging at about 600.degree. F. for a period of at least about 300 hours.
REFERENCES:
patent: 3449077 (1969-06-01), Stuetz
patent: 3886251 (1975-05-01), Sekiguchi et al.
patent: 3903248 (1975-09-01), Kalnin et al.
Chenevey Edward C.
Haider M. Ishaq
Hoechst Celanese Corp.
Lusignan Michael
Mazzarese Joseph M.
LandOfFree
Thermo-oxidatively stabilized polybenzimidazole-containing artic does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Thermo-oxidatively stabilized polybenzimidazole-containing artic, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermo-oxidatively stabilized polybenzimidazole-containing artic will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1629930