Catalyst system for high-cis polybutadiene
AssigneeDow Global Technologies LLC
InventorsAdriaan A. van der Huizen, Jean-Marc Potlet, Alain Sabatier, Patrick Le Roy
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Abstract
A catalyst system suitable for use in the production of high cis polybutadiene is disclosed. The catalyst system includes a cobalt salt of the formulaCoAx?, where A is a monovalent or divalent anion and x is 1 or 2; an alkyl aluminum chloride compound of the structure R2AlCl, where R is an alkyl group containing 2-8 carbon atoms; a trialkyl aluminum compound of the formula R3Al, where R is an alkyl group containing 2-8 carbon atoms; and a catalytic amount of water.
Claims15
A catalyst system suitable for use in the production of high cis polybutadiene, comprising:
- cobalt neodecanoate;
- alkyl aluminum chloride selected from ethylaluminum sesquichloride and a compound of the structure R2AlCl where R is an alkyl group containing 2-8 carbon atoms;
- trialkyl aluminum compound of the formula R3Al, where R is an alkyl group containing 2-8 carbon atoms;
- and
- water,
- wherein the cobalt neodecanoate is present in an amount such that the molar ratio of Co to Al is from 1:75 to 1:150.
A catalyst system suitable for use in the production of high cis polybutadiene, comprising the product of mixture of:
- a) cobalt neodecanoate;
- b) ethylaluminum sesquichloride;
- c) trioctyl aluminum;
- and
- d) water,
- wherein ethylaluminum sesquichloride and trioctyl aluminum are added in such an amount that the concentration of Al is in the range of from 0.002 to 0.004 moles per liter, and the cobalt neodecanoate is present in an amount such that the molar ratio of Co to Al is in the range of 1:75 to 1:150.
A process for producing polybutadiene having a high cis content comprising contacting a feed comprising 1,3-butadiene, butene and cyclohexane with a catalyst system to polymerize the 1,3-butadiene, wherein the catalyst system comprises:
- a) a cobalt neodecanoate;
- b) alkyl aluminum chloride selected from ethylaluminum sesquichloride and a compound of the structure R2AlCl where R is an alkyl group containing 2-8 carbon atoms;
- c) trialkyl aluminum compound of the formula R3Al, where R is an alkyl group containing 2-8 carbon atoms;
- and
- d) water,
- wherein the cobalt neodecanoate is present in an amount such that the ratio of Co to Al is from 1:75 to 1:150.
Dependencies are inferred from the claim text.