Carbocationic catalysts and process for using said catalysts
AssigneeExxon Chemical Patents Inc.
InventorTimothy D. Shaffer
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Abstract
A living carbocationic catalyst composition comprising an initiator of a tertiary alkyl halide, a tertiary aralkyl halide or polymeric halide a co-initiator of an alkyl aluminum or alkyl boron, a proton scavenger and a solvent medium with a dielectric constant between 2.5 and 3.25 is used to produce narrow molecular weight distribution polymers particularly isobutylene polymers.
Claims27
A catalyst composition comprising:
- an initiator of a tertiary alkyl halide or a tertiary aralkyl halide;
- a co-initiator which is an alkyl aluminum or an alkyl boron compound;
- a proton scavenger;
- and
- a solvent medium having a dielectric constant between about 2.5 and about 3.25.
A process for producing a polymer comprising contacting under polymerization conditions one or more olefinic, alpha olefinic, disubstituted olefinic or styrenic monomers with a catalyst composition comprising:
- an initiator of a tertiary alkyl halide or a tertiary aralkyl halide;
- a co-initiator of an alkyl aluminum or alkyl boron, wherein each alkyl is independently a straight or branched chain C.sub.1 to C.sub.15 alkyl;
- a proton scavenger;
- and
- a solvent medium with a dielectric constant between 2.5 and 3.25.
A catalyst composition comprising:
- an initiator of tertiary alkyl halide or tertiary aralkyl halide;
- a co-initiator of a dialkyl aluminum chloride or dialkyl boron chloride;
- and
- a proton scavenger;
- in a solvent of 60 to 20 parts by volume methylene chloride and 40 to 80 parts by volume methyl cyclohexane.
A process for producing a polymer comprising contacting under polymerization conditions one or more olefinic, alpha olefinic, disubstituted olefinic or styrenic monomers with a catalyst composition comprising:
- an initiator of a tertiary alkyl halide, or a tertiary aralkyl halide;
- a coinitiator of an alkyl aluminum or alkyl boron, wherein each alkyl is independently a straight or branched chain C.sub.1 to C.sub.15 alkyl;
- a proton scavenger;
- and
- a solvent medium with a dielectric constant between 2.5 and 3.25.
A process for the living polymerization of one or more olefin, alpha-olefin or di-substituted olefin monomers comprising contacting in a solvent medium of 60 to 20 methylene chloride units and 40 to 80 methyl cyclohexane units by volume, for a total of about 100 parts under polymerization conditions said monomers with an:
- initiator of a tertiary alkyl halide or tertiary aralkyl halide;
- co-initiator of di-alkyl aluminum chloride or di-alkyl boron chloride and a proton scavenger.
A process for producing polymers with long chain branching comprising contacting monomers selected from the group consisting of olefins, alpha-olefins, styrenes, di-substituted olefins and mixtures thereof under polymerization conditions with:
- an initiator of a multiply-halogenated tertiary polymeric halide;
- a co-initiator of an alkyl aluminum halide or an alkyl boron halide;
- a proton scavenger;
- and
- a solvent medium having a dielectric constant between about 2.5 and about 3.25;
- provided that the initiator has at least one tertiary halide in or along the polymer backbone.
Dependencies are inferred from the claim text.