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Zie·gler catalyst | \ ˈzēglə(r)- \
Definition of Ziegler catalyst
: a catalyst (as triethyl-aluminum or a complex of a trialkyl-aluminum with titanium tetrachloride) that promotes an ionic type of polymerization of ethylene, propylene, or related olefins at atmospheric pressure with the resultant formation of a relatively high-melting polyethylene, a stereoregular polypropylene, or similar product
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