Bleaching and dyeing; fluid treatment and chemical modification – Chemical modification of textiles or fibers or products thereof – Treating textiles or fibers from synthetic resin or natural...
Patent
1987-07-13
1989-05-02
Lieberman, Paul
Bleaching and dyeing; fluid treatment and chemical modification
Chemical modification of textiles or fibers or products thereof
Treating textiles or fibers from synthetic resin or natural...
81156, 811556, 811557, 811565, D06M 1334, D06M 1326
Patent
active
048265020
ABSTRACT:
A process for sulfonating preformed hydroxyethylated polybenzimidazole fibers is disclosed. The process comprises the steps of forming an hydroxyethylated polybenzimidazole spinning solution; spinning hydroxyethylated polybenzimidazole fibers, sulfonating the fibers by contacting them with a sulfonating agent, and heating the fiber in an inert atmosphere at a temperature and for a period of time sufficient to convert the ionic bonds, formed in the sulfonating step to covalent bonds, thereby, providing a covalently bonded, sulfonated, hydroxyethylated polybenzimidazole fiber. The fibers produced by the process of the present invention exhibit cation selectivity for electrodialysis and electrochemical applications.
REFERENCES:
patent: 3578644 (1971-05-01), Trischler
patent: 4599388 (1986-07-01), Bohrer et al.
Abbot et al., "The Flammability, Thermal Stability and Dyeability Properties of High Temperature Organic Fibers", Technical Report AFML-TR-73-29, Feb. 1973.
Reinhart, K. A. et al., "PBI Dyeing and Color Stabilization", AD-775 356.
Onorato Frank J.
Pulaski Harry
Sansone Michael J.
Hoechst Celanese Corp.
Lieberman Paul
McNally John F.
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