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Ziegler-Natta catalyst for high temperature polymerization

  • US 10,590,214 B2
  • Filed: 06/06/2018
  • Issued: 03/17/2020
  • Est. Priority Date: 08/12/2014
  • Status: Active Grant
First Claim
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1. A process to prepare an olefin polymerization procatalyst comprising a Ti3+ complex, said process comprising:

  • a) forming a delta form MgCl2 species by combiningi) a Mg compound chosen from butylethyl magnesium (BEM), dibutyl magnesium, and butyloctyl magnesium (BOM), in cyclohexane,andii) reactive organic chloride or HCl;

    wherein the mole ratio of added Cl and Mg is from 2.15 to 2.5;

    b) adding to said delta form MgCl2 species prepared in step a), an aluminum alkyl halide of the formula R1xAlX3-x first, a tetravalent titanium compound second, followed by an alkyl aluminum alkoxide of the formula R4yAlOR53-y, wherein the Al/Ti molar ratio when measuring Al supplied from R1xAlX3-x only is from about 0.7 to about 2 and the Al/Ti molar ratio when measuring Al supplied from R4yALOR53-y is from about 1 to about 1.7;

    and further whereinthe Mg/Ti molar ratio is from about 5 to about 10;

    x is 1 or 2;

    y is 1 or 2;

    each R1 is independently chosen from C1-8 alkyl radicals;

    the tetravalent titanium compound is chosen from TiR2X3, Ti(OR3)X3, TiX4, and mixtures thereof;

    each X is independently chosen from the halogen radicals; and

    each R2 is independently chosen from C1-8 alkyl radicals and benzyl;

    each R3, R4 and R5 are independently chosen from C1-8 alkyl radicalswherein the process used to prepare the delta form MgCl2 species allows for the next steps of the procatalyst formation to follow without the need for intervening washing steps.

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