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US 8,796,383 B2Granted
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.
Claims23
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 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.;
- wherein the polypropylene is a random copolymer comprising between about 0.5 wt % to about 5.0 wt % comonomer relative to the total weight of the copolymer;
- and
- 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.
1 more element
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 modified olefin based polymer exhibits a seal initiation temperature (SIT) that is at least 5° C. less a seal initiation temperature of the polypropylene absent the PLA and a hot tack range of at least 20° C.;
- 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;
- wherein the polypropylene is a random copolymer comprising between about 0.5 wt % to about 5.0 wt % comonomer relative to the total weight of the copolymer;
- and
- forming the modified olefin based polymer into a film.
2 more elements
Dependencies are inferred from the claim text.