Patent ID: 9090526
Filing Date: 2015-07-28
Classification: C07C,C08F

Abstract:
1. A method of inhibiting polymerization of vinyl monomers in a liquid, comprising adding to said liquid a composition comprising Compound A and Compound B, wherein: Compound A is a quinone methide compound with the formula: wherein R 1 and R 2 may be the same or different and each of R 1 and R 2 is selected from the group consisting of H, C 4 to C 18 alkyl, C 5 to C 12 cycloalkyl, C 7 to C 15 phenylalkyl, and any combination thereof, and R 3 is an aryl, an aryl substituted with C 1 to C 6 alkyl, an alkoxy, a nitro, an amino, a carboxy, a nitrile, a methoxy, 4-hydroxy-3,5-di-tert-butylphenyl, an acetylenic group, a phenyl-substituted acetyleno, a phenyl-substituted acetyleno substituted with C 1 to C 6 alkyl, alkoxy, nitro, amino, carboxy, and any combination thereof; Compound B is a quinone diimide compound of the formula: wherein R 1 and R 2 may be the same or different and each of R1 and R2 is selected from the group consisting of an alkyl, an aryl, an alkaryl, and an aralkyl; wherein the weight ratio of Compound A to Compound B is from about 9:1 to about 1:9, and the polymerization is inhibited within an anaerobic environment.