Intractable poly(p-phenylenebenzobisthiazole) fiber
Poly(p-phenylenebenzobisthiazole) (PBT) fiber which is at least partially insoluble in methanesulfonic acid at room temperature. The fiber is prepared by heat treatment of PBT fiber, for a time sufficient to make it at least partially insoluble in methanesulfonic acid, at temperatures of 550.degree. C. (e.g., for 600 seconds) to 780.degree. C. (e.g., for 18 seconds).
Description
Patent History
Patent number: T105604
Type: Grant
Filed: May 21, 1984
Date of Patent: Jul 2, 1985
Inventor: William C. Uy (Wilmington, DE)
Application Number: 6/611,932
Type: Grant
Filed: May 21, 1984
Date of Patent: Jul 2, 1985
Inventor: William C. Uy (Wilmington, DE)
Application Number: 6/611,932
Classifications
Current U.S. Class:
Rod, Strand, Filament Or Fiber (428/364);
Phosphorus- Or Sulfur-containing Reactant (528/337)
International Classification: D02G 300;
International Classification: D02G 300;
