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Control of a solution process for polymerization of ethylene

  • US 5,589,555 A
  • Filed: 07/07/1995
  • Issued: 12/31/1996
  • Est. Priority Date: 10/03/1991
  • Status: Expired due to Fees
First Claim
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1. A process for the solution polymerization of high molecular weight polymers of alpha olefins selected from the group consisting of homopolymers of ethylene and copolymers of ethylene and C3-12 alpha olefins at a temperature from 105°

  • to 320°

    C. and a pressure from 4-20 MPa, said process comprising feeding to a tubular reactor kept under non-isothermal conditions or a series of reactors which operate under different conditions, monomer, selected from the group consisting of ethylene and mixtures of ethylene and at least one C3-12 alpha olefin, a hydrocarbon solvent and a catalyst;

    wherein said catalyst is prepared by in-line mixing at a temperature of less than 30°

    C.;

    (i) a catalyst precursor prepared by the in-line mixing at a temperature of less than 30°

    C. of a mixture consisting of;

    (a) MgR12 and AIR23 wherein each R1 and R2 is the same or different and is a C1-10 alkyl radical;

    (b) a reactive halide; and

    (c) titanium tetrachloride;

    to provide a molar ratio of halide to magnesium from 2.2 to 2.4;

    magnesium to titanium of 5; and

    aluminum to titanium of 0.9;

    with(ii) a catalyst activator prepared by in-line mixing at a temperature of less than 30°

    C. a composition consisting of;

    (d) a first component which is an aluminum alkyl of the formula AIR3 wherein R is an alkyl radical of the 2-8 carbon atoms;

    with(e) an alcohol of the formula R4 OH wherein R4 is a C1-20 alkyl radical in a ratio of alcohol to aluminum from 0.1 to 1.

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