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US 2014/0235791 A1Published application
Polypropylene and polylactic acid formulations for heat seal applications
AssigneeFina Technology, Inc.
InventorsFengkui Li, John Ashbaugh
Life of this patent
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Abstract
Films (or a cap layer of co-extruded films) and methods of forming the same are described herein. The films generally include a modified olefin based polymer including polypropylene and from 1 wt. % to 30 wt. % polylactic acid (PLA), wherein the modified olefin based polymer exhibits a seal initiation temperature (SIT) that is at least 5° C. less than a seal initiation temperature of the polypropylene absent the PLA and a hot tack range of at least 20° C.
Claims22
1-21. (canceled)
A film or a cap layer of co-extruded films comprising:
- a modified olefin based polymer comprising polypropylene, a reactive modifier comprising a functionalized polyolefin, and from 1 wt. % to 30 wt. % polylactic acid (PLA);
- wherein the reactive modifier is formed by grafting in the presence of an initiator and a modifier, wherein the modifier comprises polyethylene glycol diacrylate, trimethylolpropane triacrylate, alkloxylated hexanediol diacrylate, or trimethylolpropane triacrylate esters.
A method of forming a film comprising:
- providing a modified olefin based polymer comprising polypropylene, a reactive modifier comprising a functionalized polyolefin, and from 1 wt. % to 30 wt. % polylactic acid (PLA), wherein the reactive modifier is formed by grafting in the presence of an initiator and a modifier, wherein the modifier comprises polyethylene glycol diacrylate, trimethylolpropane triacrylate, alkloxylated hexanediol diacrylate, or trimethylolpropane triacrylate esters;
- and
- forming the modified olefin based polymer into a film.
Dependencies are inferred from the claim text.