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US 5,213,744 AGranted
Process for making polyolefin films
AssigneeExxon Chemical Patents Inc.
InventorBernard L. L. Bossaert
Life of this patent
Estimating the term…
Abstract
Polyolefin films for heat sealed packaging and twist wrapping are obtained by blending under high shear conditions and a rosin or resin, preferably hydrogenated to form a concentrate containing from 10 to 90 wt. %, preferably 20 to 60 wt. % of the resin or rosin and subsequently blending the concentrate with a and extruding the resultant blend to form a film.
Claims14
A process for the production of polyolefin films comprising:
- blending under high shear conditions a polyolefin selected from the group consisting of polypropylene and copolymers of propylene with up to 20 wt. % of ethylene or a C.sub.4 to C.sub.8 mono alpha olefin, and at least one modifier selected from the group consisting of a resin and a resin to form a concentrate mixture comprising 10 to 90 wt. % polyolefin and 10 to 90 wt. % modifier;
- mixing said concentrate with additional polyolefin selected from the group consisting of polypropylene with copolymers of propylene with up to 20 wt. % of ethylene or a C.sub.4 to C.sub.8 mono alpha olefin, to form a blend comprising 70 to 95 wt. % polyolefin and 5 to 30 wt. % modifier;
- and
- extruding the blend to form a film.
1 more element
A process for the production of polyolefin films comprising:
- blending under high shear conditions a polyolefin selected from the group consisting of polypropylene and copolymers of propylene with up to 20 wt. % of ethylene or a C.sub.4 to C.sub.8 mono alpha olefin, and at least one modifier selected from the group consisting of resin and rosin to form a concentrate mixture comprising 60 to 90 wt % modifier and 10 to 40 wt % polyolefin;
- mixing said concentrate mixture with additional polyolefin selected from the group consisting of polypropylene and copolymers of propylene with up to 20 wt. % of ethylene or a C.sub.4 to C.sub.8 mono alpha olefin, to form a blend comprising 70 to 95 wt % polyolefin and 5 to 30 wt % modifier;
- and
- extruding the blend to form a film.
1 more element
Dependencies are inferred from the claim text.