A method for extracting non reactive α, β - ethylene saturated nitrile monomer from carboxyl containing nitrile rubber latex

摘要

Provided is a method for recovering, from a latex of a nitrile rubber obtained by emulsion polymerization of a monomer mixture containing an α,β-ethylenically unsaturated nitrile monomer and a carboxyl group-containing monomer, unreacted α,β-ethylenically unsaturated nitrile monomer contained in the latex, the method comprising a step for adjusting the pH of the latex of the nitrile rubber to 6.5 or more, a step for reducing the pressure to the latex of the nitrile rubber having the pH adjusted to 6.5 or more, under a heating condition, and a step for recovering components evaporated by the pressure reduction under the heating condition.