Biaxially oriented bio-based polyester films and laminates

• US 10,137,625 B2
• Filed: 07/08/2011
• Issued: 11/27/2018
• Est. Priority Date: 07/08/2011
• Status: Active Grant

• Current Assignee: Toray Plastics (America), Inc. (Toray Industries Incorporated)
• Original Assignee: Toray Plastics (America), Inc. (Toray Industries Incorporated)
• Inventors: Sakellarides, Stefanos L., Chang, Keunsuk P.
• Primary Examiner(s): Rummel, Ian
• Application Number:
  US13/179,007
• Publication Number:
  US 20130011631A1
• Time in Patent Office: 2,699 Days
• Field of Search: 4281951
• CPC Class Codes: B29C 2948/92704 Temperature
• CPC Class Codes: B29C 48/0018 combined with shaping by orienting, stretching or shrinking, e.g. film blowing B29C48/0017 takes precedence
• CPC Class Codes: B29C 48/0022 combined with cutting
• CPC Class Codes: B29C 48/022 characterised by the choice of material
• CPC Class Codes: B29C 48/08 flexible, e.g. films
• CPC Class Codes: B29C 48/21 the layers being joined at their surfaces
• CPC Class Codes: B29C 48/92 Measuring, controlling or regulating
• CPC Class Codes: B29C 55/023 using multilayered plates or sheets
• CPC Class Codes: B29C 55/12 biaxial
• CPC Class Codes: B29C 65/18 using heated tools
• CPC Class Codes: B29C 65/48 using adhesives , i.e. using supplementary joining material; solvent bonding
• CPC Class Codes: B29C 65/8215 Tensile tests
• CPC Class Codes: B29C 66/0042 of the joining tool and the parts to be joined B29C66/0046 takes precedence; joining tool characterized by its composition B29C66/8122; joining tool characterized by its microstructure B29C66/8124
• CPC Class Codes: B29C 66/45 Joining of substantially the whole surface of the articles methods or apparatus for laminating B32B37/00
• CPC Class Codes: B29C 66/71 characterised by the composition of the plastics material of the parts to be joined welding bar compositions B29C65/125
• CPC Class Codes: B29C 66/72341 for gases
• CPC Class Codes: B29C 66/73713 bi-axially or multi-axially
• CPC Class Codes: B29C 66/73715 heat-shrinkable
• CPC Class Codes: B29C 66/73791 biodegradable
• CPC Class Codes: B29C 66/91411 of the parts to be joined, e.g. the joining process taking the temperature of the parts to be joined into account
• CPC Class Codes: B29C 66/91423 : using joining tools having different temperature zones or using several joining tools with different temperatures
• CPC Class Codes: B29C 66/919 : characterised by specific temperature, heat or thermal flux values or ranges specific electrical resistance values B29C66/81262
• CPC Class Codes: B29C 66/929 : characterized by specific pressure, force, mechanical power or displacement values or ranges
• CPC Class Codes: B29C 66/949 : characterised by specific time values or ranges
• CPC Class Codes: B29K 2067/00 : Use of polyesters or derivatives thereof, as moulding material
• CPC Class Codes: B29K 2067/003 : PET, i.e. poylethylene terephthalate
• CPC Class Codes: B29K 2995/0056 : Biocompatible, e.g. biopolymers or bioelastomers
• CPC Class Codes: B29L 2031/744 : Labels, badges, e.g. marker sleeves
• CPC Class Codes: B32B 15/09 : comprising polyesters
• CPC Class Codes: B32B 2439/70 : Food packaging
• CPC Class Codes: B32B 27/06 : as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08
• CPC Class Codes: B32B 27/18 : characterised by the use of special additives
• CPC Class Codes: B32B 27/36 : comprising polyesters
• CPC Class Codes: Y10T 428/24802 : Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
• CPC Class Codes: Y10T 428/31681 : Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.]
• CPC Class Codes: Y10T 428/31786 : Of polyester [e.g., alkyd, etc.]

Abstract

A laminate film including at least one bio-based polyester layer. The polyester layer has a radiocarbon (¹⁴C) 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.

Claims

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/m²/day at 23 degrees Celsius and 0% RH, and a water vapor transmission rate of 0.03-0.70 g/m²/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/m²/day at 23 degrees Celsius and 0% RH, and a water vapor transmission rate of 0.03-0.70g/m²/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/m²/day at 23 degrees Celsius and 0% RH, and a water vapor transmission rate of 0.03-0.70 g/m²/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.