Process for the preparation of polymers of but-1-ene
AssigneeEthylene Plastique
InventorsBernard Boucheron, Emile Gosset
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Abstract
The invention provides a process for the preparation of but-1-ene homopolymers or copolymers of but-1-ene containing up to 15% by weight of at least one other .alpha.-olefin by the stereo-specific polymerization, using a Ziegler-Natta catalyst, of but-1-ene in a homogeneous reaction mixture. By employing a homogeneous reaction mixture comprising at least 70% by weight of but-1-ene and from 1 to 30% by weight of an inert hydrocarbon solvent which is capable of dissolving at least 100 g/l of an isotactic polybutene it is possible to employ reaction temperatures of from 35.degree. to 55.degree. C., thereby improving the quality of the resulting but-1-ene polymer while avoiding precipitation of polymer during the course of the reaction.
Claims5
In a process for the preparation of a polymer selected from the group consisting of but-1-ene homopolymers and copolymers of but-1-ene containing up to 15% by weight of units derived from at least one other .alpha.-olefin by the polymerization or copolymerization of but-1-ene in the presence of a sterospecific Ziegler-Natta catalyst and in a homogeneous reaction mixture, and at a temperature of from 35.degree. to 55.degree. C. the improvement which comprises introducing into the reaction mixture to avoid precipitation of the polymer during the course of the reaction from 1 to 30% by weight of at least one inert hydrocarbon solvent selected from the group consisting of benezene, toluene, xylene, cyclohexane and methylcyclohexane.
A process for the preparation of an isotactic polybut-1-ene by polymerizing but-1-ene in the presence of a catalyst comprising an organoaluminium compound and a titanium halogen compound in a homogeneous reaction mixture at a temperature of from 35.degree. to 55.degree. C., the improvement which comprises introducing into the reaction mixture to avoid precipitation of the polymer during the course of the reaction from 2 to 15% by weight of at least one inert hydrocarbon solvent selected from the group consisting of benzene, toluene, xylene, cyclohexane and methylcyclohexane.
Dependencies are inferred from the claim text.