Production of high-vinyl group, low-molecular weight unsaturated hydrocarbon polymers
AssigneeChemische Werke Huls Aktiengesellschaft
InventorWolfgang Kampf
Life of this patent
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Abstract
Low molecular weight polybutadiene, polyisoprene and other hydrocarbon polymers having a high vinyl and a low 1,4-trans-double bond content, which are useful in varnishes and impregnating compositions, are produced employing as catalyst system (a) a cobalt compound; (b) a halogen-containing organoaluminum compound; and (c) an organic phosphite of the formula PR.sub.1, R.sub.2, R.sub.3 wherein R.sub.1, R.sub.2 and R.sub.3 are alkoxy, alkenyloxy or monocyclic aryloxy; and optionally (d) an H-acidic compound, e.g., water.
Claims10
A process for the production of low molecular weight butadiene polymers having a molecular weight distribution of between 1 and 1.5 and whose double bonds are 10-70% vinyl, 30-90% 1,4-cis and 0-10% 1,4-trans, by the polymerization of butadiene, in bulk or in the presence of a solvent, which comprises employing as the catalyst system:
- a. 0.01 to 0.5 millimole per mole of monomer to be catalyzed of one or both of cobalt octoate and cobalt acetylacetonate;
- b. a dialkyl aluminum halide in an amount such that the molar ratio of the cobalt in (a) to the aluminum in (b) is from 1:1 to 1:2,000;
- c. triphenyl phosphite, in a molar ratio to (a) of from 0.3:1 to 10:1;
- and
- d. an H-acidic compound in a molar ratio to the aluminum in (b) of up to 1.5:1.
A catalyst system for polymerizing conjugated dienes consisting essentially of
- a. one or both of cobalt octoate and cobalt acetylacetonate;
- b. a dialkyl aluminum halide in an amount such that the molar ratio of the cobalt in (a) to the aluminum in (b) is from 1:1 to 1:2,000;
- c. triphenyl phosphite, in a molar ratio to (a) of from 0.3:1 to 10:1, and
- d. an H-acidic compound in a molar ratio to the aluminum in (b) of up to 1.5:1.
Dependencies are inferred from the claim text.