Polyurethaneurea solutions and spandex therefrom

Details Polyurethaneurea solutions and spandex therefrom Polyurethaneurea solutions and spandex therefrom

1991-10-31

1994-02-22

Michl, Paul R.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524126, 528 51, C08J 320, C08K 549, C08L 7502, C08G 1808

Patent

active

052887790

ABSTRACT:
Certain 4,4'-biphenylene diphosphonites in solutions of polyurethaneurea polymer, in concentrations of 0.05 to 1.5% based on dry polymer weight, protect the solutions from undesired changes in solution viscosity.

REFERENCES:
patent: 3726836 (1973-04-01), Nakahara et al.
patent: 3939111 (1976-02-01), Schollenberger et al.
patent: 4075163 (1978-02-01), Hofer et al.
patent: 4548975 (1985-10-01), Lewis
patent: 4677154 (1987-06-01), Narayan et al.
patent: 4877825 (1989-10-01), Kausch et al.

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