Patent ID: 6011096
Filing Date: 2000-01-04
Classification: C08F,C11D

Abstract:
An improved process for the preparation of a vinylpyridine polymeric product which comprises:(a) mixing water with a N-vinylpyridine monomer optionally mono- or di-substituted on the ring with C.sub.1 to C.sub.4 alkyl in the presence of between about 0.5 and about 25 wt. %, based on total monomer, of a water soluble suspension agent at below polymerization temperature;(b) gradually heating the mixture of (a) to polymerization temperature while introducing a polymerization initiating amount of a free radical polymerization initiator;(c) polymerizing the monomer while adding portions of initiator throughout the polymerization and continuing the polymerization reaction until the monomer concentration is below 1 wt. % and(d) recovering the resulting vinylpyridine polymer product in water as a stable suspension of substantially pure polymer microparticles.