Process for producing a gel-free coagulated rubber with low ethylenic unsaturation
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United States of America Patent
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Oct 15, 1991
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N/A
app pub date -
Nov 6, 1989
filing date -
Nov 6, 1989
priority date (Note) -
Expired
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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.
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