Biaxially oriented polylactic acid film with high barrier
AssigneeToray Plastics (America), Inc.
InventorsJoshua R. Cloutier, Takeshi Mizumura, Keunsuk P. Chang
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Abstract
A multilayer film including a first layer including a polylactic acid polymer, a second layer of a metal primer, deposited upon one surface of the first polylactic acid polymer layer, and a third metal layer deposited on the second metal primer layer. This metal-primed and metallized polylactic acid film exhibits improved moisture barrier properties versus a non-metal-primed and metallized polylactic acid film and can be used as part of a lamination structure for food packaging applications.
Claims17
A biaxially oriented film comprising:
- a first layer comprising a polylactic acid polymer;
- a noncontiguous second layer comprising metal on a surface of the first layer, wherein the second layer has a weight per area of 5 to 2000 ng/cm2;
- and
- a third layer comprising metal on a surface of the second layer,
- wherein all polymer containing layers in the biaxially oriented film comprise polylactic acid polymer and the film has a moisture vapor transmission rate of 1.0 g/m2/day or less at 100° F. and 90% relative humidity.
A biaxially oriented film comprising:
- a first layer comprising a polylactic acid polymer;
- a noncontiguous second layer comprising metal on a surface of the first layer, wherein the second layer has a weight per area of 5 to 2000 ng/cm2;
- a third layer comprising metal on a surface of the second layer;
- and
- a fourth layer comprising a polylatic acid polymer, wherein the forth layer is heat sealable, wherein all polymer containing layers in the biaxially oriented film comprise polylactic acid polymer and the film has a moisture vapor transmission rate of 1.0 g/m2/day or less at 100° F. and 90% relative humidity.
A biaxially oriented film comprising:
- a first layer comprising a polylactic acid polymer;
- a noncontiguous second layer comprising metal on an untreated surface of the first layer, wherein the second layer has a weight per area of 5 to 2000 ng/cm2;
- and
- a third layer comprising metal on a surface of the second layer;
- wherein the film has a moisture vapor transmission rate of 1.0 g/m2/day or less at 100° F. and 90% relative humidity.
A biaxially oriented film comprising:
- a first layer comprising a polylactic acid polymer;
- a second layer consisting essentially of copper or titanium on a surface of the first layer, wherein the second layer has a weight per area of 5 to 2000 ng/cm2;
- and
- a third layer comprising aluminum on a surface of the second layer;
- wherein the film has a moisture vapor transmission rate of 1.0 g/m2/day or less at 100° F. and 90% relative humidity.
Dependencies are inferred from the claim text.