The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 12, 1976
Filed:
May. 08, 1975
William J Farrissey, Jr, Northford, CT (US);
Besir K Onder, North Haven, CT (US);
The Upjohn Company, Kalamazoo, MI (US);
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.