Film comprising polylactic acid polymer suitable for graphic articles
Assignee3M Innovative Properties Company
InventorsNing Zhou, Diane North, Matthew A. Jast
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Abstract
An article is described comprising a first film layer comprising polylactic acid polymer (semicrystalline polylactic acid polymer; amorphous polylactic acid polymer; or a mixture thereof); a second (e.g. polyvinyl acetate) polymer having a Tg of at least 25° C.; plasticizer. In some embodiment, the film layer further comprises inorganic pigment and/or hydrolysis stabilizer. In other embodiments, the film has a net melting endotherm, ΔHnm1, of less than 10 J/g. Also described are methods of making a graphic film.
Claims20
An article comprising a first film layer comprising amorphous polylactic acid polymer;
- a second polymer having a Tg of at least 25° C.;
- plasticizer;
- semicrystalline polylactic acid polymer in an amount of zero or less than 1 wt. % based on the total amount of polylactic acid polymers, second polymer, and plasticizer;
- wherein the first film layer has a net melting endotherm for the first heating scan, ΔHnm1, of less than 10 J/g at a rate of 10° C./min.
Dependencies are inferred from the claim text.