Stabilization of polyurethanes

Details Stabilization of polyurethanes Stabilization of polyurethanes

1981-10-15

1984-05-08

Ziegler, J.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524191, 524193, 524194, 525509, 528 44, 528 85, C08K 524

Patent

active

044475713

ABSTRACT:
A process for providing water based anionic polyurethanes having improved thermal oxidation color stability. Water dispersed amine salts of anionic prepolymers prepared from the reaction of polyhydroxy compounds and dihydroxy carboxylic acids with diisocyanates are chain-extended with hydrazine or hydrazide and thereafter optionally with a diamine, when cured at temperatures in excess of 150.degree. C., form polyurethane products having substantially no discoloration and good mechanical properties. Alternately, the hydrazide may be employed as an additive rather than as a chain-extender. The process is particularly useful when employing cross-linking agents which react only at high temperatures.

REFERENCES:
patent: 3188302 (1965-06-01), Lorenz et al.
patent: 3923713 (1975-12-01), Hermann
patent: 3929726 (1975-12-01), Schollenberger et al.

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