Process for preparation of butyl rubber having broad molecular weight distribution
OwnerAdam Gronowskiinventor
Life of this patent
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Abstract
A process for preparing a butyl polymer having a broad molecular weight distribution. 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 a 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 an aluminoxane.
Claims19
A process for preparing a butyl polymer having a broad molecular weight distribution, 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 a 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 an aluminoxane.
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 −80° C. to −20° 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 present in an amount in the range of from about 0.3 to about 3.0 weight percent based on the total weight of the aluminum-containing components of the catalyst mixture.
Dependencies are inferred from the claim text.