Process for the production of polyisoolefins by means of novel metallocene type initiator systems
AssigneeBayer Aktiengesellschaft
InventorsGerhard Langstein, Manfred Bochmann, David M. Dawson
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Abstract
Polyisoolefins are produced using the process according to the invention by polymerising isoolefins, optionally with conjugated or unconjugated dienes and/or cationically polymerisable, mono- or polyunsaturated compounds in solution, in suspension or in the gas phase at temperatures of -100.degree. C. to +200.degree. C. and pressures of 0.1 to 100 bar in the presence of an initiator system consisting of aluminium-cyclopentadienyl compounds and boron compounds.
Claims9
Process for the production of polyisoolefins, comprising the step of polymerizing isoolefins of the formula CH.sub.2 .dbd.CR.sup.1 R.sup.2, where R.sup.1 means methyl and R.sup.2 means C.sub.1 -C.sub.10 alkyl or C.sub.3 -C.sub.10 cycloalkyl, optionally together with conjugated or unconjugated dienes having 4 to 20 carbon atoms and/or cationically polymerisable, mono- or polyunsaturated compounds having 4 to 20 carbon atoms, in solution, in suspension or in the gas phase at temperatures of -100.degree. C. to +200.degree. C. and pressures of 0.1 to 100 bar in the presence of initiator systems consisting of the following components:
- A) Cp'.sub.2 AlR.sup.3 and
- B) BR.sup.4 R.sup.5 R.sup.6,
- in which
- Cp' is an optionally substituted cyclopentadienyl residue,
- R.sup.3 denotes C.sub.1 -C.sub.10 alkyl or C.sub.3 -C.sub.10 cycloalkyl and
- R.sup.4, R.sup.5 and R.sup.6 have the meaning of R.sup.3 or represent C.sub.6 -C.sub.18 aryl groups which may be mono- or polysubstituted by halogen.
Novel initiator systems for the polymerisation of isoolefins consisting of:
- A) Cp'.sub.2 AlR.sup.3 and
- B) BR.sup.4 R.sup.5 R.sup.6,
- in which
- Cp' is an optionally substituted cyclopentadienyl residue,
- R.sup.3 denotes C.sub.1 -C.sub.10 alkyl or C.sub.3 -C.sub.10 cycloalkyl and
- R.sup.4, R.sup.5 and R.sup.6 have the meaning of R.sup.3 or represent C.sub.6 -C.sub.18 aryl groups, which may be mono- or polysubstituted by halogen.
Dependencies are inferred from the claim text.