Co-polymerization of an isoolefin with a halogenated co-monomer
AssigneeLANXESS Corporation
InventorJudit E Puskas
Life of this patent
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Abstract
A co-polymer of isobutene and 4-bromo-3-methyl-1-butene formed by direct co-polymerization in a single-step process. A continuous process for forming the co-polymer preferably comprises periodic or semi-continuous addition of catalyst to a mixed monomer solution. Semi-continuous reverse addition of the mixed monomer solution to a pre-provided catalyst solution may also be employed. The co-polymer exhibits allylic bromide functionality and is advantageously curable by either ZnO curing systems or sulfur-based curing systems.
Claims20
A polymer comprising:
- a) repeating units derived from at least one isoolefin monomer;
- and,
- b) repeating units derived from a halogenated co-monomer of the formula:
- wherein,
- R1 is a C1-C20 alkyl group, a C2-C20 linear or branched olefinic group, or a substituted aromatic hydrocarbon,
- R2 is hydrogen or a C1-C20 alkyl group,
- X is bromine or chlorine.
A method of preparing a polymer comprising:
- a) providing a mixture of an isoolefin monomer and a halogenated co-monomer of the formula:
- wherein,
- R1 is a C1-C20 alkyl group, a C2 to C20 linear or branched olefinic group, or a substituted aromatic hydrocarbon,
- R2 is hydrogen or a C1-C20 alkyl group,
- X is bromine or chlorine,
- dissolved in a polymerization diluent;
- b) adding a cationogen initiator in a semi-continuous manner to the mixture;
- and,
- c) reacting the monomers to form the polymer.
A method of preparing a polymer comprising:
- a) providing a solution of a cationogen initiator in a catalyst solvent;
- b) adding a mixture of an isoolefin monomer and a halogenated co-monomer of the formula:
- wherein,
- R1 is a C1-C20 alkyl group, a C2 to C20 linear or branched olefinic group, or a substituted aromatic hydrocarbon,
- R2 is hydrogen or a C1-C20 alkyl group,
- X is bromine or chlorine,
- dissolved in a polymerization diluent in a semi-continuous manner to the solution;
- and,
- c) reacting the monomers to form the polymer.
Dependencies are inferred from the claim text.