Process for producing elastane fibers of high elasticity and str

Details Process for producing elastane fibers of high elasticity and str Process for producing elastane fibers of high elasticity and str

1990-09-21

1991-10-29

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

26421114, 528 52, 528 58, 528 61, 528 64, D01F 678

Patent

active

050614266

ABSTRACT:
A process for the production of highly elastic elastane fibers (spandex fibers) based on segmented polyurethane (urea) elastomers having high elasticity and, at the same time, high strength values, balanced elastic properties and excellent thermal and hydrothermal behavior, wherein relatively high molecular weight, carbonate-linked, block-like polyester of polyester etherdiols having molecular weight of 3,300 to 7,000 are reacted with macrodiols with diisocyanates in a molecular ratio of 1:2.5 to 1:4.5 to obtain NCO prepolymers which have NCO contents of 2.10 to 4.0% NCO, then the NCO prepolymer is chain-extended with (cyclo)-aliphatic diamines to fom polyurethane (urea) elastomers.

REFERENCES:
patent: 4192940 (1980-03-01), Lindner et al.
patent: 4254229 (1981-03-01), Schwindo et al.
patent: 4808691 (1989-02-01), Konig et al.
patent: 4810749 (1989-03-01), Pinchuk
patent: 4816529 (1989-03-01), Harris
patent: 4963310 (1990-10-01), Mitamura
patent: 4964890 (1990-10-01), Reuter et al.
patent: 4978691 (1990-12-01), Murai et al.

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