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Abstract

An improved method of terminating ethylene polymerization and interpolymerization reactions by deactivating the Ziegler-type catalyst used in the reaction comprises the step of injecting a selected deactivating agent into the molten polymer solution in the polymerization reactor prior to degassing of the polymer solution. The deactivating agent is selected from the group consisting of: (a) natural hydrotalcite minerals and synthetic hydrotalcite-like materials; (b) Group IIIA metal salts of monocarboxylic acids; (c) alkali metal and alkaline earth metal salts of alkarylsulfonic acids; (d) alkali metal and alkaline earth metal salts of alkyl and alkaryl sulfuric acids; (e) organophosphites of a formula selected from the group consisting of (RO).sub.3 P and (RO).sub.2 POH where R is a hydrocarbon group containing 1 to 22 carbon atoms, inclusive; (f) ethoxylated hydrocarbylamines of the formula R'.sub.3-n N[(OCH.sub.2 CH.sub.2).sub.m OH].sub.n where R' is hydrogen or a hydrocarbon group containing 1 to 22 carbon atoms, inclusive, and at least one R' is a hydrocarbon group, n is 1 or 2, and m is an integer between 1 and 22, inclusive; (g) monocarboxylic acid esters of triethanolamine of the formula (RCOOCH.sub.2 CH.sub.2).sub.3 N where R is a hydrocarbon group containing 1 to 22 carbon atoms, inclusive; and (h) organotin salts of maleic acid of the formula [-Sn(R).sub.2 OOCCH.dbd.CHCOO-] where R is a hydrocarbon group containing 1 to 22 carbon atoms, inclusive.

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