Patent ID: 6127455
Filing Date: 2000-10-03
Classification: C08F

Abstract:
A process of forming a stable seed polymer for use in an emulsion polymerization reaction, the process comprising the steps of:providing a polymerizable aqueous mixture comprising a monomer selected from the group consisting of .alpha.-methyl styrene, p-tertiary butyl styrene, methyl vinyl toluene, p-vinyl toluene, 3-ethyl styrene, piperylene, isoprene, 2,3-dimethyl-1,3-butadiene, methacrylate, methylmethacrylate, butylacrylate, 2-ethylhexylacrylate, laurylacrylate, hydroxyethylmethacrylate, and mixtures thereof, emulsifying agent, initiator, about 0.05 to about 2.5 pph of at least one polymerizable ethylenically unsaturated carboxylic acid;polymerizing the aqueous mixture in the presence of about 0.05 to about 3 pph of at least one nonpolymerizable di- or tri-carboxylic acid to establish a concentration of hydronium ions and form the seed polymer.