Multilayer films of FDCA-based polyesters

Patent metadata

Field	Value
Publication number	US-9969150-B2
Application number	US-201314653753-A
Country	US
Kind code	B2
Filing date	Dec 18, 2013
Priority date	Dec 20, 2012
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A multilayer film comprising (a) a biaxially-oriented polyethylene furanoate (BO-PEF) polymer layer, (b) an optional ink layer, (c) a bonding layer, and (d) a sealant layer, wherein the BO-PEF polymer has an O 2 gas permeability of less than 0.25 cc-mil/100 in. 2 24 hrs atm at 80% relative humidity, or a moisture permeability of less than 0.5 g-mil/100 in. 2 24 hrs atm at 38° C., or both. The film may be formed from microlayers of BO-PEF-based polymer and polymer with a melting point of at least 5° C. greater than the melting point of the BO-PEF-based polymer.

First claim

What is claimed is:

1. A multilayer film comprising (a) a biaxially-oriented polyethylene furanoate (BO-PEF) polymer layer, (b) an optional ink layer, (c) a bonding layer, and (d) a sealant layer, wherein the BO-PEF polymer layer has (i) an O2 gas permeability of 0.25 cc-mil/100 in.2 24 hrs atm (5 cc 20 μm/m2 24 hrs atm) at 80% relative humidity (ASTM D-3985) or less, or (ii) a moisture permeability of 0.5 g-mil/100 in.2 24 hrs atm (9.8 g 20 μm/m2 24 hrs atm) at 38° C. (ASTM F-1249) or less, or (iii) both, and
wherein the BO-PEF polymer layer comprises a microlayer sequence comprising a number, n, of repeating units, each repeating unit comprising at least two microlayers, (a) and (b),
wherein (a) is a first polymer with a melting point of at least 5° C. greater than the melting point of second polymer (b); and
wherein second polymer (b) is a BO-PEF polymer formed from one or more diacid or diester monomers selected from the group consisting of 2,5-furan dicarboxylic acid (FDCA) and C 1 to C 10 alkyl diesters thereof, wherein said monomers comprise at least 35 mole % of the BO-PEF polymer,
said microlayer sequence being characterized by the absence of any tie layer between microlayers (a) and (b),
such that the resulting structure has the formula {(a)(b)(c)}n, where (c) represents one or more optional additional layers which may be the same or different from layers a and b, but which layer(s) (c) are not tie layers.

2. The multilayer film of claim 1 wherein the BO-PEF polymer has (a) a weight average molecular weight of 20,000 to 100,000 and (b) a polydispersity index of less than 4.

3. The multilayer film of claim 1 , wherein 100 mole % of diacid or diester monomers used to form the BO-PEF polymer are selected from the group consisting of FDCA and C 1 to C 10 alkyl diesters thereof.

4. The multilayer film of claim 1 , wherein the diacid or diester monomers used to form the BO-PEF polymer further comprises up to 65 mole % of 2,6-naphthalene dicarboxylic acid (NDCA), one or more C 1 to C 10 alkyl diester thereof, glycolide, or combinations thereof.

5. The multilayer film of claim 1 wherein the BO-PEF layer is coated with a layer of polyvinylidene chloride (PVDC) polymer.

6. The multilayer film of claim 1 wherein the sealant layer comprises one or more layers of polyethylene (PE) polymer.

7. The multilayer film of claim 6 wherein the sealant layer comprises one or more polymers selected from the group consisting of low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), very low-density polyethylene (VLDPE), ethylene vinyl acetate (EVA), and polypropylene (PP).

8. The multilayer film of claim 1 further comprising one or more layers of ethylene vinyl alcohol (EVOH).

9. The multilayer film of claim 8 wherein the film comprises tie layers between adjacent layers of sealant layer and EVOH layers.

10. The multilayer film of claim 1 further comprising an abuse layer formed from a polymer selected from the groups consisting of a polyolefin, polyethylene terephthalate and nylon.

11. The multilayer film of claim 1 further comprising a foil or metalized layer.

12. The multilayer film of claim 1 which does not contain a foil or metalized layer.

Assignees

• Dow Global Technologies Llc

Inventors

• Bhattacharjee Debkumar
• Jenkins Steven R
• Sehanobish Kalyan

Classifications

• B32B7/02

  Physical, chemical or physicochemical properties · CPC title

• B32B2307/7242

  Non-permeable · CPC title

• B32B2439/70

  Food packaging · CPC title

• Y10T428/31678

  Of metal · CPC title

• Y10T428/31786

  Of polyester [e.g., alkyd, etc.] · CPC title