Polymers of propylene with one or two olefin comonomers are produced through the use of a polymerization catalyst supported on a carrier produced by spray crystallization and having a maximum dimension of 55 .mu.m. Copolymers of superior properties are obtained, and the production process is de-snagged.

 
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< Method of preparing cyclic olefin copolymer having controlled gel contents

> Production of broad molecular weight polyethylene

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