Process for efficient utilization of chain transfer agent
AssigneeRohm and Haas Company
InventorsIrwin S. Fiarman, Thomas F. McCallum, III, Barry Weinstein
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Abstract
A process for efficiently utilizing hypophosphorous acid or salts thereof as a chain transfer agent is provided wherein the polymerization is conducted to a final polymer solids level of at least about 50 percent by weight. The polymers produced are useful as dispersants for paint formulations, additives for laundry and machine dishwashing detergents, mineral dispersants, dispersants for kaolin clay slurries and scale inhibitors, dispersants and corrosion inhibitors for water treatment and oil production.
Claims10
A process for utilizing hypophosphorous acid or salts thereof as a chain transfer agent, comprising:
- polymerizing one or more monomers wherein at least 20 percent by weight of the one or more monomers are monoethylenically unsaturated acids, or salts thereof, in the presence of
- (a) water
- (b) one or more water-soluble initiators, and
- (c) hypophosphorous acid or a salt thereof,
- wherein from about 80 to 100 percent of the monoethylenically unsaturated acids, or salts thereof, are metered into a polymerization reactor containing
- water,
- from 0 to 100 percent of the hypophosphorous acid or salts thereof to provide a final polymer solids level of at least about 50 percent by weight.
Dependencies are inferred from the claim text.