Polypropylene for use in bopp applications
AssigneeDow Global Technologies LLC
InventorsBeth A. Kuettel, Drew A. Davidock, Li-Min Tau, Thomas R. Cuthbert
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Abstract
The present invention relates to polypropylene compositions having a broad molecular weight distribution with a relatively high amount of xylene soluble material. The compositions have an Mw/Mn of five or greater, but preferably greater than 5.5 and more preferably greater than 6.0. The compositions have xylene solubles from 5.0 to 8.0 percent by weight, preferably from 5.5 to 8.0 percent by weight, and more preferably 6.0 to 7.5 percent by weight. The polymers of the present invention are particularly well suited for biaxially oriented polypropylene applications.
Claims15
A multi-reactor homopolymer propylene based polymer having an Mw/Mn greater than 5 and having a xylene soluble content from 5 to 8 percent by weight.
An improved method for producing biaxially oriented polypropylene film comprising
- a. selecting a multi-reactor homopolymer propylene based polymer having a Mw/Mn greater than 5 and having a xylene soluble content of from 5 to 8 percent by weight;
- b. extruding the propylene based polymer into a flat sheet
- c. forming a film using a tenter biaxially oriented film process.
A homopolymer polypropylene based polymer having an Mw/Mn greater than 6 and xylene solubles greater than 6.4% by weight.
The polymer of claim 15 wherein the polymer comprises from 0 to 1.5 percent by weight of units derived from an alpha olefin other than propylene.
Dependencies are inferred from the claim text.