Procatalyst particles and polymerization process for impact copolymers
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United States of America Patent
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Aug 28, 2018
Grant Date -
Oct 13, 2016
app pub date -
Nov 26, 2014
filing date -
Nov 27, 2013
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Abstract
Particles of a procatalyst composition having a particle size D50 from 19 microns to 30 microns. A polymerization process comprising halogenating, in the presence of a substituted phenylene aromatic diester, particles of a MagTi procatalyst precursor to form particles of a procatalyst composition having a particle size D50 from 19 microns to 30 microns; first contacting a propylene and optionally one or more first comonomers with a catalyst composition comprising the particles of the procatalyst composition in a first polymerization reactor to form an active propylene-based polymer; and second contacting the active propylene-based polymer with at least one second comonomer in a second polymerization reactor to form a propylene impact copolymer.
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