Process for the production of a propylene polymer having a broad molecular weight distribution and a low ash content
AssigneeTotal Petrochemicals Research Feluy
InventorsAlain Standaert, Jerome Gromada
Life of this patent
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Abstract
The present invention relates to a process for the production of propylene homo- and copolymers having a broad molecular weight distribution and a low ash content, with “ash” denoting aluminium as well as residues of catalyst, cocatalyst or any additive, such as titanium (Ti) or silicium (Si) derivatives, used in the production of propylene polymers. The propylene polymers of the present invention are useful to make films, such as capacitor films, as well as fibers and nonwovens, such as for example staple fibers, spunbond nonwovens, meltblown nonwovens.
Claims16
1-15. (canceled)
A process for the production of propylene polymers having a broad molecular weight distribution and a low ash content by polymerization of propylene and one or more optional comonomers in presence of:
- (a) a Ziegler-Natta catalyst comprising a titanium compound having at least one titanium-halogen bond, and an internal electron donor, both supported on a magnesium halide in active form;
- (b) triethyl aluminium, and
- (c) an optional external electron donor (ED),
- wherein the internal donor comprises at least 80 wt % of a compound selected from the group consisting of succinates, di-ketones and enamino-imines;
- wherein the molar ratio Al/Ti is at most 40;
- and wherein the propylene polymers are recovered from the polymerization reactor, without any washing, as a powder and optionally converted to pellets.
A fiber or nonwoven comprising the propylene polymer of 21.
Dependencies are inferred from the claim text.