US 9,221,213 B2 · Multi-layer high moisture barrier polylactic acid film

Abstract

A laminate film including a first polylactic acid layer; a second metal-receiving layer including PVOH, EVOH, or a blend thereof on a side of the first polylactic acid layer; and a metal layer deposited on a side of the metal-receiving layer opposite the polylactic acid layer. The metal-receiving layer may be coextruded with the polylactic acid first layer or may be a coating applied to one side of the polylactic acid first layer. This laminate film exhibits excellent gas and moisture barrier properties, appearance, and metal adhesion. It may also include a heat sealable or winding improving layer on the side opposite the metal receiving-layer of the first polylactic acid layer.

Claims19

Dependent claims

A laminate film comprising:

a biaxially oriented first layer comprising polylactic acid (PLA), wherein the thickness of the first layer is 15-25 μm;
a metal receiving second layer comprising uncrosslinked ethylene vinyl alcohol (EVOH) and a pro-degradant, wherein the second layer is co-extruded on a side of the first layer, wherein the thickness of the second layer is 1-2 μm;
and
a metal barrier layer on a side of the second layer opposite the PLA-containing layer;
wherein the laminate film has a single barrier layer, wherein the metal barrier layer is the single barrier layer, and a moisture vapor transmission rate equal to or less than 0.37 g/m2/day.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

13/030,392Filed 18 Feb 2011 · continuation in part

Priority

25 Sep 2009

Published

US 2011/0076511 A114 Jul 2011

Granted

29 Dec 2015

Term ends

Not estimatedThe source records don’t support an estimate.

Classification69 codes

B29C 55/023
Of plates or sheets: using multilayered plates or sheets
B29C 55/143
Successively: firstly parallel to the direction of feed and then transversely thereto
B32B 7/12
Interconnection of layers: using interposed adhesives or interposed materials with bonding properties
B32B 15/08
Comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material: of synthetic resin

Family

Application61/246,048Us provisional application · filed 25 Sep 2009

Application61/306,210Us provisional application · filed 19 Feb 2010

Application12/890,349Parent of this continuation-in-part · filed 24 Sep 2010

US 2011/0171489 A1Pre-grant publication · published 14 Jul 2011

US 9,023,443 B2Parent of this continuation-in-part

US 2011/0076511 A1Published application

US 9,221,213 B2This patent

From the US filing history. Foreign family members aren’t listed.

Multi-layer high moisture barrier polylactic acid film

Life of this patent

Multi-layer high moisture barrier polylactic acid film

Life of this patent

Abstract

Claims19