Process for the manufacture of a catalyst
AssigneeHoechst Aktiengesellschaft
InventorKlemens Gutweiler
Life of this patent
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Abstract
A catalyst for the polymerization of 1-olefins is prepared by successively applying a chromate ester and a titanium ester to a carrier containing silicon dioxide, in the absence of an unsaturated polymerizable hydrocarbon, and activating with an aluminum-organic compound. In the manufacture of the catalyst no washing liquids are obtained from which metal compounds would have to be separated. In the presence of hydrogen the catalyst gives a high yield of polymers with broad molecular weight distribution and a small content of high molecular constituents. The films made therefrom are practically free from specks.
Claims28
A process for producing a catalyst, which comprises reacting, in the absence of water and in an inert diluent and under inert gas, a chromate ester of the formula
- (RO).sub.2 CrO.sub.2,
- wherein R is a tertiary alkyl or aralkyl of from 4 to 24 carbon atoms, with an anhydrous carrier selected from the group consisting of oxides of silicon, oxides of aluminum and mixtures thereof, the chromate ester being reacted with the carrier at a temperature of from 0.degree. to 40.degree. C. for a period of from 1 to 360 minutes in a proportion of from 1 to 40 millimols of chromate ester per 100 g of carrier;
- treating the reaction product thereof, which is suspended in said inert diluent, at a temperature of from 0.degree. to 100.degree. C. for a period of from 0.5 to 80 hours, in the absence of an unsaturated polymerizable hydrocarbon and under inert gas, with a titanium compound of the formula ##STR2## wherein R.sup.4, R.sup.4', R.sup.4" and R.sup.4'" are the same or not all the same and each is a linear or branched alkyl group of from 1 to 12 carbon atoms, the amount of said titanium compound being such that the proportion of Cr to Ti is of from 1:1 to 1:10;
- and mixing said treated reaction product, either while said product is still in suspension or after removal of the diluent and drying, with an aluminum-organic compound.
A process for producing a catalyst, which comprises reacting, in the absence of water and in an inert diluent and under inert gas, a chromate ester of the formula
- (RO).sub.2 CrO.sub.2,
- wherein R is tertiary alkyl or aralkyl of from 4 to 24 carbon atoms, with a carrier previously dried at a temperature of from 120.degree. to 800.degree. C. to remove all water adsorbed thereon and selected from the group consisting of oxides of silicon, oxides of aluminum and mixtures thereof, the chromate ester being reacted with the carrier at a temperature of from 0.degree. to 40.degree. C. for a period of from 1 to 360 minutes in a proportion of from 1 to 40 millimols of chromate ester per 100 g of carrier;
- treating the reaction product thereof, which is suspended in said inert diluent, at a temperature of from 0.degree. to 100.degree. C. for a period of from 0.5 to 80 hours, in the absence of an unsaturated polymerizable hydrocarbon and under inert gas, with a titanium compound of the formula ##STR3## wherein R.sup.4, R.sup.4', R.sup.4" and R.sup.4'" are the same or not all the same and each is a linear or branched alkyl grop of from 1 to 12 carbon atoms, the amount of said titanium compound being such that the proportion of Cr to Ti is of from 1:1 to 1:10;
- and mixing said treated reaction product, either while said product is still in suspension or after removal of the diluent and drying, with an aluminum-organic compound.
Dependencies are inferred from the claim text.