Ronald L Gibbs

US Patent:

44080255, Oct 4, 1983

Filed:

Nov 12, 1981

Appl. No.:

6/320231

Inventors:

Randall S. Shipley - Alvin TX
Kirby Lowery - Baton Rouge LA
Ronald L. Gibbs - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08F 402
C08F 1000

US Classification:

526119

Abstract:

Olefins are polymerized in the presence of a catalyst prepared by reacting a mixture of a tetrahydrocarbyloxy titanium compound such as tetraisopropyl titanate and a hydrocarbyloxy titanium oxide such as di(isopropoxy) titanium oxide, an organomagnesium component such as a hydrocarbon soluble complex of dialkyl magnesium and an organoaluminum compound such as triethyl aluminum and a halide source such as ethyl aluminum dichloride. The catalysts employed in this process provide higher efficiencies than these catalysts employing either of the titanium compounds alone.

US Patent:

43797601, Apr 12, 1983

Filed:

Nov 12, 1981

Appl. No.:

6/320650

Inventors:

Randall S. Shipley - Alvin TX
Kirby Lowery - Baton Rouge LA
Ronald L. Gibbs - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08F 464

US Classification:

252429B

Abstract:

Compositions exhibiting high catalytic activity in the polymerization of. alpha. -olefins are prepared by reacting a mixture of a tetrahydrocarbyloxy titanium compound such as tetraisopropyl titanate and a hydrocarbyloxy titanium oxide such as di(isopropoxy) titanium oxide, an organomagnesium component such as a hydrocarbon soluble complex of dialkyl magnesium and an organoaluminum compound such as triethyl aluminum and a halide source such as ethyl aluminum dichloride. Polymerization processes employing this catalyst composition do not require conventional catalyst removal steps in order to provide polymers having suitable color and other physical characteristics and these catalysts provide higher efficiencies than those catalysts employing either of the titanium compounds alone.