Patents by Inventor Claude Chamla

Claude Chamla has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Supported polyolefin catalyst for the (co-)polymerization of ethylene in gas phase
    Patent number: 5166281
    Abstract: The present invention relates to a catalyst and a process for preparing a catalyst suitable for polymerization of olefins. The process is carried out in a hydrocarbon liquid medium and comprises successively contacting a refractory oxide support with (a) a dialkylmagnesium optionally with a trialkylaluminium, (b) a particular monochloro organic compound, (c) a titanium and/or vanadium compound(s), and then (d) with ethylene optionally mixed with a C.sub.3 -C.sub.8 alpha-olefin in the presence of an organo-aluminium or organozinc compound to form a prepolymerised catalyst. The catalyst has a high activity, particularly in a gas phase polymerization of ethylene, and has a great ability of copolymerizing alpha-olefins with ethylene.
    Type: Grant
    Filed: March 6, 1992
    Date of Patent: November 24, 1992
    Assignee: BP Chemicals Limited
    Inventors: Claude Chamla, Erick Daire
  • Supported polyolefin catalyst for the (Co-)polymerization of ethylene in gas phase
    Patent number: 5124296
    Abstract: The present invention relates to a catalyst and a process for preparing a catalyst suitable for polymerization of olefins. The process is carried out in a hydrocarbon liquid medium and comprises successively contacting a refractory oxide support with (a) a dialkylmagnesium optionally with a trialkylaluminium, (b) a particular monochloro organic compound, (c) a titanium and/or vanadium compound(s), and then (d) with ethylene optionally mixed with a C.sub.3 -C.sub.8 alpha-olefin in the presence of an organo-aluminium or organozinc compound to form a prepolymerized catalyst. The catalyst has a high activity, particularly in a gas phase polymerization of ethylene, and has a great ability of copolymerizing alpha-olefins with ethylene.
    Type: Grant
    Filed: March 25, 1991
    Date of Patent: June 23, 1992
    Assignee: BP Chemicals Limited
    Inventors: Claude Chamla, Erick Daire
  • Process for polymerising ethylene using a chromium oxide catalyst
    Patent number: 4879359
    Abstract: Process for polymerising ethylene, or copolymerising ethylene with an alpha-olefin, in the gas phase in the presence of a prepolymer/catalyst composition, the catalyst being an activated chromium oxide supported on a refractory oxide. The prepolymer is treated to an extraction with a solution comprising inert hydrocarbon and an organometallic compound, for example an alkylaluminum, prior to being dried and introduced into the gas phase (co) polymerisation. Prepolymer thus treated has improved properties in the dry state, for example improved flow.
    Type: Grant
    Filed: December 24, 1987
    Date of Patent: November 7, 1989
    Assignee: BP Chemicals Limited
    Inventors: Claude Chamla, John G. Speakman