Water-absorptive polyurethane fiber and method of producing the

Details Water-absorptive polyurethane fiber and method of producing the Water-absorptive polyurethane fiber and method of producing the

1998-07-16

2000-01-25

Edwards, Newton

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

428394, 578 44, 578 61, D07G 300, C08G 1410, C08G 1800

Patent

active

060176253

ABSTRACT:
A water-insoluble, nonionic water-absorptive polyurethane fiber that combines the properties of high water absorptivity and excellent physical strength is produced by extrusion from a thermoplastic polyurethane resin composition at a temperature higher than its melting point. The thermoplastic polyurethane resin composition, which has a water absorption rate within the range of 200-3,000%, is obtained by reacting a polyisocyanate compound, a water-soluble polyalkylene ether polyol having a weight-average molecular weight of 2,000-13,000 and a chain extender at an equivalent ratio (R ratio) between the equivalent number of NCO groups and the equivalent number of OH groups in the range of 1.0 to 1.8. Also provided is a method of producing the water-absorptive polyurethane fiber.

REFERENCES:
patent: 3901852 (1975-08-01), Shah
patent: 5340902 (1994-08-01), Smith et al.

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