High productivity spandex fiber process and product

Details High productivity spandex fiber process and product High productivity spandex fiber process and product

2005-07-12

2005-07-12

Sergent, Rabon (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

C528S061000, C528S067000, C528S076000, C528S080000, C528S083000, C528S906000

Reexamination Certificate

active

06916896

ABSTRACT:
Commercially acceptable spandex can be prepared with greater efficiency, improved consistency and at lower costs from a high-solids content polyurethaneurea polymer solution. The polyurethaneurea is prepared using a combination of 4,4′-MDI and 2,4′-MDI, and an amount of chain extenders and chain terminators such that the polymer solution, prior to spinning, is highly soluble and has an appropriate pre-spun IV and primary amine content.

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