Highly elastic polyurethanes suitable for fiber production can be obtained by various synthetic routes based on diisocyanate polyaddition processes. Macro-diisocyanates obtained from long chain diols and diisocyanates are allowed to react with polyamides during fiber formation (chemical spinning process) or the macrodiisocyanates are treated in solvents (e.g., dimethylformamide) with polyamines to give highly viscous, spinnable solutions of polymer. Both methods yield highly elastic polymers with wide-mesh network structures. The production of polyurethane fibers and their structures and physical properties are described.

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Rubber Division, American Chemical Society, Inc.
1963
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