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SOLVENT SPINNING PROCESSES
MELT SPINNING PROCESSES
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added addition adipic acid alcohol aliphatic alkyl alkylene amino groups amount aromatic diisocyanate bischloroformate carbon atoms catalyst chain lengthening agents containing copolymer cross-linking curing agent cycloaliphatic denier difunctional dimethyl formamide diol dissolved divalent elastic fibers elastomers elongation end groups ester ether ethyl ethylene diamine ethylene glycol example extruded fiber-forming molecular weight formula grams hard segments heated high melting homopolymer hydrazide hydroxyl groups isocyanate isocyanate groups low molecular weight melting point minutes mixture modulus molecular weight N-alkylated polyurethane NCO groups obtained organic diisocyanate organic radical oxide piperazine poly polyester polyether glycol polyisocyanate polymer polymer chain polymerization polyurethane preferred prepolymer properties reactants reaction reactive repeating unit room temperature segmented polymer semipolymer setting bath soft segments soluble solvent spandex spinneret spinning process spinning solution spun stirring stress decay substantially linear suitable tensile recovery terminal tertiary amine thread U.S. Patent urea urethane viscosity yarn