Polyurethane elastic fiber
AssigneeAsahi Kasei Fibers Corporation
InventorsMasayuki Adachi, Takamasa Mori, Junichi Kojima
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Abstract
Provided are novel polyurethane elastic fibers having a high recovery stress, low hysteresis loss, and high heat resistance. The polyurethane elastic fibers of the present invention are polyurethane elastic fibers formed from a polyurethaneurea obtained from a copolyalkylene ether diol produced from different C2-10 alkylene ethers; a diisocyanate; and a diamine, the polyurethane elastic fibers being characterized in that the polyurethaneurea has a hard segment percentage of 14.0% to 25.0% as defined by formula (1): hard segment percentage (%)=(urea moiety number-average molecular weight)/{(urea moiety number-average molecular weight)+(moiety segment number-average molecular weight)}×100 (formula. (1)).
Claims8
An elastic polyurethane fiber comprising a polyurethaneurea which is prepared from a copolyalkylene ether diol comprising C2-10 different alkylene ethers a diisocyanate, and a diamine, wherein the polyurethaneurea has a hard segment content of from 14,0% to 25.0% inclusive, as defined by Equation (1) below:
- Hard Segment Content (%)=(Number Average Molecular Weight of Urea Moieties)/{(Number Average Molecular Weight of Urethane Moieties)+(Number Average Molecular Weight of Urea Moieties)}×100 Equation (1)
Dependencies are inferred from the claim text.