Stamicarbon B.v.

Stamicarbon N.v.

Henricus M Creemers

Hendrinus M Verschoor

Renier J Graff

Hubertus J Henskens

Process for the removal of unconverted monomers from a copolymer of acrylonitrile with one or more monomers copolymerizable therewith by a treatment with steam wherein

Process for the removal of non-converted monomers from a copolymer of

A process for polymerizing .alpha.-olefins in the liquid phase is disclosed, wherein the olefins are polymerized in the presence of a catalyst prepared by first reacting as aluminum-halogen compound with an organomagnesium compound and thereafter reacting the resulting reaction mixture with a transition metal compound and then activating the resulting catalyst system with an organo-aluminum compound. The homopolymers and copolymers of .alpha.-olefins produced by this process find use in the normal applications of such polymers.

Process of polymerizing .alpha.-olefins in the liquid phase

A process for suspension polymerizing butene-1 with 0 to about 20 mol % of at least one other .alpha.-alkene of 2 to 10 carbon atoms is disclosed, wherein the monomers are polymerized in the presence of a Ziegler coordination catalyst using isobutane as the polymerization solvent. The polymerization reaction is effected at a temperature of 20.degree.-70.degree.C. The product polybutene is obtained in the form of a suspension which is easily handled and which has high isotactic polybutene content.

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Geleen, Netherlands

Henricus M Creemers