Quaternized epichlorohydrin copolymer useful in treating potable water and method of preparation
AssigneeThe Dow Chemical Company
InventorsHerman S. Gilbert, Stephen F. Kelley
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Abstract
This invention relates to a water soluble quaternized epihalohydrin copolymer. The copolymer is prepared by first reacting an epihalohydrin with a polyepoxide in an organic solvent in the presence of a polymerization catalyst. The copolymer thus produced is then quaternized by reacting it with a tertiary amine. The quaternized epihalohydrin copolymer is useful in removing suspended solids from aqueous dispersions. It is particularly useful in processes for clarifying raw water.
Claims5
A water-soluble, crosslinked, quaternized halogen-containing alkylene oxide copolymer consisting essentially of mer units derived from (1) an epihalohydrin in the proportion of 50 to 99.9 mole percent, (2) a non-halogen-containing alkylene oxide in the proportion of 0 to 49.9 mole percent and (3) a polyepoxide in the proportion of from 0.1 to 10 mole percent, wherein from 10 to 100 percent of the halomethyl groups of the copolymer have been quaternized by reaction with a tertiary amine.
Dependencies are inferred from the claim text.