Recovery method of unreacted. Alpha.,. Beta. - ethylenic unsaturated nitrile monomer contained in latex of carboxyl group nitrile rubber

摘要

Alpha. beta. - ethylenic unsaturated nitrile monomerFrom latex of nitrile rubber obtained by emulsion polymerization of a monomer mixture containing monomer and carboxyl group containing monomerIncluded in latexUnreacted alphaMethod for recovering. Beta. - ethylenically unsaturated nitrile monomerAdjusting the pH of the latex of the nitrile rubber to 6.5 or moreLatex nitrile rubber with a pH adjusted to 6.5 or moreDecompression step under heating conditionsThe apparatus comprises a process of recovering the evaporated component by decompression under said heating conditionsUnreacted alphaA method for recovering. Beta. - ethylenically unsaturated nitrile monomer.