Patent ID: 9656888
Date: 2017-05-23
CPC Classifications: C02F,C08G

Claim:
1. A method of treating water or an aqueous-based system, comprising adding to the water or aqueous-based system a polymer that is a water-soluble cationic polyamine having at least one end group that is a residue of at least one alkylating agent, wherein said polymer is produced by a process comprising: polymerizing a reaction mixture in the absence of the alkylating agent to form a polyamine polymer having a desired viscosity; and after polymerizing, reacting the alkylating agent with the polyamine polymer to end-cap tertiary amine chain ends of the polyamine polymer, wherein the reaction mixture comprises: a) at least a secondary amine, b) at least a difunctional epoxide, and c) a polyfunctional amine.