Polyurethane and elastic fiber obtained therefrom

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/65 (2006.01) C08G 18/12 (2006.01) C08G 18/66 (2006.01) D01F 6/70 (2006.01)

Patent

CA 2445685

The polyurethane of the present invention comprises a high molecular weight polyol, an organic polyisocyanate, and a low molecular weight polyol, and has a crosslinked structure. The bonds forming the crosslinked points in the polyurethane comprise urethaee bonds formed by the reaction of aromatic hydroxyl groups and aliphatic isocyaoato groups and/or urethane bonds formed by the reaction of aromatic hydroxyl groups and benzylic iaocyanato groups, being 0.1 to 54% of the total urethane bonds. The polyurethane of the present invention is superior in elastic recovery, and the urethane bonds of the crosslinked points reversibly dissociate end bond beyond a certain temperature. Consequently, it is possible to manufacture, from this polyurethane, an elastic fiber which has a high heat setting rate above a certain temperature, and which has elastic recovery after a heat setting process which is as superior as the elastic recovery before the heat setting process.

L'invention concerne une polyuréthanne comprenant les éléments suivants: polyol de masse moléculaire élevée, polyisocyanate organique, et polyol de faible masse moléculaire, avec structure réticulée. Les liaisons formant les sites de réticulation de la polyuréthanne comportent des liaisons uréthanne résultant de la réaction entre un groupe hydroxyle aromatique et un groupe isocyanate aliphatique, et/ou des liaisons uréthanne résultant de la réaction entre un groupe hydroxyle aromatique et un groupe isocyanate benzylique, selon une proportion comprise entre 0,1 et 50 % par rapport à toutes les liaisons uréthanne. Le produit offre les qualités suivantes: excellente reprise élastique, clivage et liaison réversibles des liaisons uréthanne aux sites de réticulation à une certaine température. On peut donc utiliser ce produit pour fabriquer une fibre élastique thermodurcissable selon un degré élevé à des températures non inférieures à une certaine température, et conservant après l'opération la même excellente reprise élastique qu'auparavant.

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