Novel linear, unbranched, non-cross-linked polymers particularly poly-[{methyl-(3-trimethylammoniopropyl)imino} trimethylene dihalide] are prepared by the polymerization of the novel monomer, 3-[N'-(3-halopropyl)-N'-methylamino]-N,N,N-trimethyl-l-propanaminium halide, or an acid addition salt thereof preferably in an oxygen excluded environment, e.g., under nitrogen or argon. The polymer, especially after modification of terminal groups, is an excellent oral anticholesterolemic.
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