Shell Oil Comapny

Union Carbide Chemicals & Plastics Technology Corporation

Shell Polypropylene Company

Stanley E Wilson

Richard A Kemp

Carma J Gibler

Linda R Chamberlain

Robert Converse Brady, Iii

Robert C Job

Thomas F Brownscombe

Charles Lee Edwards

A catalyst composition for the polymerization of olefins comprising the combination of one or more Ziegler-Natta procatalysts comprising one or more transition metal compounds; one or more aluminum containing cocatalysts; and a mixture comprising two or more selectivity control agents (SCA's), corresponding to the formula: (CHO)Si(OR), wherein R, independently each occurrence, is Calkyl, Ccycloalkyl, Caryl or (poly)alkyl-substituted aryl, or Cpoly(aryl)-substituted alkyl, and n is an integer from zero to 4.

Catalyst composition and polymerization process using mixture of silane electron donors

Electron donors

Novel compositions of the structure ##STR1## wherein R.sup.1 and R.sup.2 are each an alkoxy group which may be the same or different and have from one to ten carbon atoms, and R.sup.3 -R.sup.6 are each individually, hydrogen, hydrocarbyl, hydrocarboxy, nitro, a silyl group or a halogen, with the provisos that if either R.sup.1 or R.sup.2 are methoxy, then at least one of R.sup.3 -R.sup.6 is not hydrogen, if R.sup.1 and R.sup.2 are both ethoxy, then at least one of R.sup.3 -R.sup.6 is not hydrogen, and R.sup.1 and R.sup.2 cannot both be methoxy, are taught herein, which may be used as electron donors, either internal or external, for catalysts used in the polymerization of olefins.

A composition containing a magnesium component, a titanium component, a halide and a 1,2-dialkoxybenzene, wherein at least one alkoxy group has at least two carbon atoms, and the manufacture of the composition are taught by the present invention. The compositions are useful as Ziegler-Natta catalysts in the production of olefin polymers.

Electron donor containing compositions

A high activity olefin polymerization catalyst catalyzes the production of polymeric lower .alpha.-olefin having good properties. The catalyst is produced from an organoaluminum cocatalyst, a selectivity control agent and a novel olefin polymerization procatalyst which is prepared by contacting a tetravalent titanium halide, an optional inert diluent, an electron donor and a novel solid procatalyst precursor obtained by contacting (a) a carbonated magnesium alkoxide of the general formula ##STR1## wherein R is a hydrocarbyl group having up to 12 carbon atoms and x is a number from 0.1 to about 2; and (b) at least one halogenating compound which is a non-transition metal halogenated compound or non-metallic halogenated compound. A process for polymerizing one or more .alpha.-olefins utilizing the novel high activity polymerization catalyst.

Process for olefin polymerization

Olefin polymerization catalyst

This is a process for the hydrogenation of conjugated diolefin polymers which comprises polymerizing or copolymerizing at least one conjugated diolefin with an organo alkali metal polymerization initiator in a suitable solvent thereby creating a living polymer, terminating the polymerization by the addition of hydrogen and effecting selective hydrogenation of the unsaturated double bonds in the conjugated diolefin units of the terminated polymer by contacting the polymer with hydrogen in the presence of an organo alkali metal promoter and Tebbe's reagent.

Selective hydrogenation of conjugated diolefin polymers with Tebbe's

This invention provides a catalyst and a process for the hydrogenation of conjugated diolefin polymers which first involves the polymerization or copolymerization of such monomers with an organo alkali metal polymerization initiator in a suitable solvent thereby creating a living polymer. The living polymer can be terminated by the addition of hydrogen. Finally, selective hydrogenation of the unsaturable double bonds in the conjugated diolefin units of the terminated polymer is carried out in the presence of an initiator and at least one rare earth compound of the formula

Selective hydrogenation of conjugation diolefin polymers with rare earth

This is a process for the depolymerization of conjugated diene polymers which comprises contacting the polymers with hydrogen in the presence of at least one bis(cyclopentadienyl)zirconium compound.

Depolymerization of conjugated diene polymers

This invention provides a catalyst and a process for the hydrogenation of conjugated diolefin polymers which first involves the polymerization or copolymerization of such monomers with an organo alkali metal polymerization initiator in a suitable solvent thereby creating a living polymer. The living polymer is preferably terminated by the addition of hydrogen. Finally, selective hydrogenation of the unsaturated double bonds in the conjugated diolefin units of the terminated polymer is carried out in the presence of at least one bis(cyclopentadienyl)titanium (+3) compound of the formula:

Selective hydrogenation of conjugated diolefin polymers

A catalyst component and catalyst composition useful in the production of elastomeric, primarily isotactic polypropylene and polybutene is disclosed and it comprises the reaction product of a magnesium alkoxide compound and a tetravalent titanium halide wherein the reaction takes place in the presence of an electron donor selected from the group consisting of veratrole and derivatives thereof. The invention also relates to a process for producing such polymers using the above catalyst.

Catalyst component for making primarily isotactic elastomeric

A process for the isomerization of a tertiary double bonded olefin having a hydrogen atom attached to a carbon atom vicinal to the tertiary carbon of the double bond comprises treating the olefin in a solution of dry liquid sulfur dioxide in the presence of a catalyst selected from oxygen, a hydroperoxide or a protic acid or mixtures thereof.

Catalytic isomerization of tertiary olefins

Di-, tri- and tetra-substituted epoxides are isomerized to allylic alcohols in the presence of a metal alkoxide catalyst in which the metal is selected from early transition metals of Groups 1VA and VA and in the absence of a solvent.

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Houston, TX, United States of America

Stanley E Wilson