Process for producing a gel-free coagulated rubber with low ethy

Details Process for producing a gel-free coagulated rubber with low ethy Process for producing a gel-free coagulated rubber with low ethy

1989-11-06

1991-10-15

Michl, Paul R.

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

Synthetic resins

Treating polymer containing material or treating a solid...

524566, 524521, 525339, 525376, 528486, 528491, 528492, 528493, 528496, 528494, C08F 610, C08F 616, C08F 624

Patent

active

050576011

ABSTRACT:
This invention relates to a process for making nitrile rubber characterized by being essentially gel-free and at least about 90% saturated. The process comprising reacting an ethylenically unsaturated polymer in latex from, hydrazine, and an oxidant, followed by coagulation and filtration in order to isolate the reduced rubber. The process utilizes a reaction mixture containing a high molar ratio of hydrazine to unsaturated polymer.

REFERENCES:
patent: 3959343 (1976-05-01), Arashi et al.
patent: 3969466 (1976-07-01), Brown et al.
patent: 4317741 (1982-03-01), Lederle et al.
patent: 4452950 (1984-06-01), Wideman
patent: 4532318 (1985-07-01), Abubakari et al.

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