D - Textiles – Paper – 01 – D
Patent
D - Textiles, Paper
01
D
18/615
D01D 5/247 (2006.01) C08J 9/02 (2006.01) D01F 6/74 (2006.01)
Patent
CA 1132320
ABSTRACT OF THE DISCLOSURE Disclosed are polyimide fibers which have a porous, microcellular structure. Also disclosed are methods of making such fibers from a precursor under conditions which cause the precursor to foam and undergo imidization. The method comprises the steps of melting and foaming a fusible copolyimide precursor comprising at least one di- ester of a benzophenonetetracarboxylic acid and at least two diamines. The ester or esters and the diamines are present in an amount such that the imide forming function- alities are substantially equimolar, one of the diamines being heterocyclic and having nitrogen in the ring, and another of the diamines being a para- or meta-substituted aromatic diamine which is free of aliphatic moieties. Any additional diamine is either a heterocyclic or an aromatic diamine as aforesaid, and the melting and foaming of the precursor is effected by heating it to a temperature in the range of 100 - 200°C. The method then includes forming fibers from the molten material thus obtained, and heating the fibers to a temperature in the range of 280 - 315°C to complete the condensation polymerization reactions and thereby develop a polymer characterized by an aromatic copolyimide structure.
336769
International Harvester Company
Meredith & Finlayson
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