Patent ID: 6024894
Filing Date: 2000-02-15
Classification: C07B,C07C,C08F,C09K

Abstract:
A method for inhibiting the polymerization of vinyl aromatic monomers comprising adding to said monomers an effective polymerization inhibiting amount of a composition comprising (A) a quinone methide derivative having the formula ##STR3## wherein: R.sub.1 and R.sub.2 are independently C.sub.4 to C.sub.18 alkyl; C.sub.5 to C.sub.12 cycloalkyl; or C.sub.7 to C.sub.15 phenylalkyl, andR.sub.3 is aryl, or aryl substituted with C.sub.1 to C.sub.6 alkyl, alkoxy, hydroxy, nitro, amino, carboxy, or mixtures thereof; and (B) a hydroxylamine compound having the formula ##STR4## wherein R.sub.10 and R.sub.11 are the same or different and are hydrogen, alkyl, aryl, alkaryl, aralkyl, or hydroxyalkyl groups and preferably have about three to about twenty carbon atoms wherein the weight ratio of (A) to (B) is about 9:1 to about 1:9.