Purification of 1,1-disubstituted ethylene

摘要

An improvement in the production of 1,1-disubstituted ethylenes is attained by contacting a 1,1-disubstituted ethylene with alumina and separating the alumina to obtain a 1,1-disubstituted ethylene with a good combination of cost, purity, shelf life and cure rate.

主权项

1. A process for improving the cure characteristics of a 1,1-disubstituted ethylene having one or two electron withdrawing substituents at the 1 position which process comprises contacting the 1,1-disubstituted ethylene with alumina having a pH that ranges from slightly acidic to moderately basic so as to reduce the induction time for cure of said 1,1-disubstituted ethylene as compared to the same material which has not been so treated, wherein the induction time for cure is reduced by conducting the alumina treatment at from about 0° C. to about 150° C. and for from about 5 minutes to about 20 hours.