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Abstract

The present invention relates to a process of producing a polymer suitable for manufacturing spandex filament having remarkable elastic recovery rate and heat-setting efficiency wherein the process comprises: stirring a mixture of a glycol and a diisocyante, where the molar ratio of diisocyanate to glycol is 1.5 to 1.64, in a homogenizer at about 40.degree. to about 50.degree. C. and reacting said mixture to give a first polymer containing less than 4 mole % of unreacted diisocyanate; then, reacting said polymer with a chain-extender mixture containing ethylenediamine, 1,2-diaminopropane, and diethylenetriamine, preferably, about 74 to about 80 mole % of ethylenediamine, about 19 to about 25 mole % of 1,2-diaminopropane and about 0.2 to about 0.8 mole % of diethylenetriamine. Elastic polyurethaneurea-based spandex filament is produced by dry-spinning the polymer.

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First Claim