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US 6,365,647 B1Granted
Process for preparing a polymeric latex
AssigneeOMNOVA Solutions Inc.
InventorIra John Westerman
Life of this patent
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Abstract
A polymeric latex prepared by aqueous emulsion polymerization of a monomeric mixture comprising styrene and butadiene in the presence of a seed polymer prepared by aqueous emulsion polymerization of styrene and a salt of 2-acrylamido-2-methylpropanesulfonic acid.
Claims6
A semi-batch aqueous emulsion polymerization process for preparing a polymeric latex having high multivalent ion stability comprising the steps of:
- preparing a polymer seed by aqueous emulsion polymerization of styrene and a salt of 2-acrylamido-2-methylpropanesulfonic acid;
- and
- polymerizing a monomeric mixture of styrene, butadiene, and optionally a nonionic monomer in the presence of the polymer seed, whereby the monomeric mixture is added in stages.
Dependencies are inferred from the claim text.