Process for preparation of butyl rubber using activated alkylaluminum halides
AssigneeBayer Aktiengesellschaft
InventorADAM GRONOWSKI
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Abstract
A process for preparing a butyl polymer having a weight average molecular weight of at least about 400,000. The process comprises the step of contacting a C4 to C8 monoolefin monomers with a C4 to C14 multiolefin monomer at a temperature in the range of from about −100° C. to about +50° C. in the presence of an aliphatic hydrocarbon diluent and a catalyst mixture comprising a major amount of a dialkylalumium halide, a minor amount of a monoalkylaluminum dihalide, and a minute amount of at least one of a member selected from the group comprising water, aluminoxane and mixtures thereof.
Claims20
A process for preparing a butyl polymer having a weight average molecular weight of at least about 400,000, the process comprising the step of:
- contacting a C4 to C8 monoolefin monomers with a C4 to C14 multiolefin monomer at a temperature in the range of from about −100° C. to about +50° C. in the presence of an aliphatic hydrocarbon diluent and a catalyst mixture comprising a major amount of a dialkylalumium halide, a minor amount of a monoalkylaluminum dihalide, and a minute amount of at least one of a member selected from the group comprising water, aluminoxane and mixtures thereof.
A process for producing a solution butyl rubber polymer having a weight average molecular weight of at least about 400,000, the process comprising the step of:
- reacting a C4 to C8 isomonoolefin with a C4 to C10 conjugated diolefin at a temperature in the range of from about about B80° C. to B20° C. in the presence of a C4 to C8 paraffinic diluent and a catalyst mixture comprising:
- (i) from about 85 to about 99 mol percent of a C2 to C16 dialkylaluminum halide component wherein each alkyl group contains from 1 to 8 carbon atoms;
- (ii) from about 1 to about 15 mol percent of a C1 to C8 monoalkylaluminum dihalide component wherein each alkyl group contains from 1 to 8 carbon atoms, and (iii) water in an amount of from about 2 to about 100 ppm of the total reaction feed.
A process for producing a solution butyl rubber polymer having a weight average molecular weight of at least about 400,000, the process comprising the step of:
- reacting a C4 to C8 isomonoolefin with a C4 to C10 conjugated diolefin at a temperature in the range of from about about B80° C. to B20° C. in the presence of a C4 to C8 paraffinic diluent and a catalyst mixture comprising:
- (i) from about 85 to about 99 mol percent of a C2 to C16 dialkylaluminum halide component wherein each alkyl group contains from 1 to 8 carbon atoms;
- (ii) from about 1 to about 15 mol percent of a C1 to C8 monoalkylaluminum dihalide component wherein each alkyl group contains from 1 to 8 carbon atoms, and (iii) an aluminoxane in an amount of from about 0.01 to about 10 ppm of the total reaction feed.
Dependencies are inferred from the claim text.