Biaxially oriented bio-based polyester films and laminates

Patent metadata

Field	Value
Publication number	US-10137625-B2
Application number	US-201113179007-A
Country	US
Kind code	B2
Filing date	Jul 8, 2011
Priority date	Jul 8, 2011
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

A laminate film including at least one bio-based polyester layer. The polyester layer has a radiocarbon ( 14 C) content of at least 21.5 pMC. The laminate film may further have additional layers such as a second bio-based polyester resin-containing layer of at least about 21.5 pMC radiocarbon content, a metal layer, or combinations thereof.

First claim

The invention claimed is:

1. A laminate film comprising:
a biaxially oriented bio-based polyester resin-containing layer comprising crystalline polymer and having a radiocarbon content of at least 21.5 pMC,
wherein both surfaces of the bio-based polyester resin-containing layer comprise particulate antiblock or slip additives, and
a metal layer on a discharge-treated surface of the laminate bio-based polyester film,
wherein the film has an oxygen transmission rate of 5-50 cc/m 2 /day at 23 degrees Celsius and 0% RH, and a water vapor transmission rate of 0.03-0.70 g/m 2 /day at 38 degrees Celsius and 90% RH.

2. The laminate film of claim 1 , wherein the bio-based polyester resin-containing layer comprises crystalline polyethylene terephthalate.

3. The laminate film of claim 1 , further comprising one or more additional layers comprising bio-based polyesters.

4. The laminate film of claim 3 , wherein the additional layers comprising bio-based polyesters comprise bio-based polyethylene terephthalate homopolymer, bio-based polyethylene terephthalate-co-isophthalate copolymer, or bio-based polyethylene 2,5-furane dicarboxylate homopolymer.

5. The laminate film of claim 1 , wherein the bio-based polyester resin-containing layer comprises polyester derived from plant sugars.

6. The laminate film of claim 1 , wherein the metal layer is aluminum.

7. The laminate film of claim 1 , wherein the metal layer has an optical density of 1.5-5.0.

8. A lamination comprising:
a biaxially oriented bio-based polyester film (A) comprising at least about 21.5 pMC and comprising particulate antiblock or slip additives;
a biaxially oriented bio-based polyester film (B) comprising at least about 21.5 pMC and comprising particulate antiblock or slip additives;
an adhesive that laminates polyester film (A) to polyester film (B);
and a vapor-deposited aluminum layer on a side of film (A),
wherein the lamination has an oxygen transmission rate of 5-50 cc/m 2 /day at 23 degrees Celsius and 0% RH, and a water vapor transmission rate of 0.03-0.70g/m 2 /day at 38 degrees Celsius and 90% RH.

9. The lamination of claim 8 , further comprising inks exhibiting a graphic content on a side of film (B).

10. The lamination of claim 8 , wherein film (A) comprises polyethylene terephthalate homopolymer of at least about 21.5 pMC.

11. The lamination of claim 10 , wherein film (B) comprises polyethylene terephthalate homopolymer of at least about 21.5 pMC.

12. A method of making a laminate film comprising:
co-extruding a biaxially oriented bio-based polyester film (A) comprising at least about 21.5 pMC and particulate antiblock or slip additives, and a biaxially oriented bio-based polyester film (B) comprising at least about 21.5 pMC and particulate antiblock or slip additives;
biaxially orienting the laminate film; and
vapor-depositing an aluminum layer on a side of polyester film (A) to achieve an oxygen transmission rate of 5-50 cc/m 2 /day at 23 degrees Celsius and 0% RH, and a water vapor transmission rate of 0.03-0.70 g/m 2 /day at 38 degrees Celsius and 90% RH.

13. The method of claim 12 , further comprising applying inks exhibiting a graphic content on a side of polyester film (B).

14. The method of claim 12 , wherein polyester film (B) comprises bio-based polyethylene terephthalate homopolymer, bio-based polyethylene terephthalate-co-isophthalate copolymers, or bio-based polyethylene 2,5-furane dicarboxylate homopolymer.

Assignees

• Sakellarides Stefanos L
• Chang Keunsuk P
• Toray Plastics America Inc

Inventors

• Sakellarides Stefanos L
• Chang Keunsuk P

Classifications

• B32B27/36

  comprising polyesters · CPC title

• B29C66/72341

  for gases · CPC title

• B29C66/949

  characterised by specific time values or ranges · CPC title

• B29K2067/003

  PET, i.e. poylethylene terephthalate · CPC title

• B32B15/09

  comprising polyesters · CPC title