Polyimide fiber having a serrated surface and a process of produ

Details Polyimide fiber having a serrated surface and a process of produ Polyimide fiber having a serrated surface and a process of produ

1975-05-08

1976-10-12

Cannon, J.C.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

264178F, 264210F, 428395, 428400, D01D 506, D01D 512, D01D 524, D01F 108, D01F 674

Patent

active

039859347

ABSTRACT:
High temperature resistant aromatic copolyimide fibers are disclosed together with processes for their preparation by wet and dry spinning techniques from solvent soluble copolyimides. The latter are prepared from benzophenone-3,3',4,4'-tetracarboxylic acid dianhydride and a mixture of 4,4'-methylenebis(phenyl isocyanate) and toluene diisocyanate (2,4-, or 2,6-isomer, or mixtures thereof). The wet spinning process can be stopped at any one of the stages taught, to yield useful fibers. The choice of coagulant fluid in the spin bath controls the fiber cross-section which in turn controls certain fiber characteristics. When glycerine or a low molecular weight aliphatic glycol is employed as coagulant fluid, the high temperature fiber obtained has advantageous properties which are otherwise difficult or impossible to obtain.

REFERENCES:
patent: 3414645 (1968-12-01), Morgan
patent: 3529051 (1970-09-01), Buckley et al.
patent: 3577387 (1971-05-01), Kersten et al.
patent: 3642706 (1972-02-01), Morgan
patent: 3673160 (1972-06-01), Buisson et al.
patent: 3708458 (1973-02-01), Alberino et al.

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