Patent ID: 6300533
Filing Date: 2001-10-09
Classification: C09K

Abstract:
A method for inhibiting the premature polymerization of an ethylenically unsaturated monomer selected from the group consisting of styrene, .alpha.-methylstyrene, styrene sulfonic acid, vinyltoluene, divinylbenzenes, polyvinylbenzenes, alkylated styrene, and 2-vinylpyridine comprising adding to said monomer an effective amount of an inhibitor having the structural formula: ##STR21##wherein R.sub.1 and R.sub.4 are independently selected from the group consisting of hydrogen, alkyl, and heteroatom-substituted alkyl, R.sub.2 and R.sub.3 are independently selected from the group consisting of alkyl and heteroatom-substituted alkyl, and the ##STR22##portion represents the atoms necessary to form a five-, six-, or seven-membered heterocyclic ring, at least one of said atoms being a carbon atom substituted with a primary or tertiary amino group.