PACKAGING COMPOSITE MATERIAL COMPRISING POLARIZING FILMS AND PACKAGING COMPRISING SAID MATERIAL

• US 20200130918A1
• Filed: 04/19/2018
• Published: 04/30/2020
• Est. Priority Date: 04/19/2017
• Status: Active Grant

• Current Assignee: The Coca-Cola Company
• Original Assignee: The Coca-Cola Company
• Inventors: Ma, Jessica, Zhao, Zhiheng, Cheng, Zhijun, Zeng, Wen, Xiong, Andy
• Granted Patent: US 11,685,587 B2
• Time in Patent Office: Days
• CPC Class Codes: B32B 2250/02 2 layers
• CPC Class Codes: B32B 2250/04 4 layers
• CPC Class Codes: B32B 2250/05 5 or more layers
• CPC Class Codes: B32B 2250/24 All layers being polymeric
• CPC Class Codes: B32B 2250/242 All polymers belonging to those covered by group B32B27/32
• CPC Class Codes: B32B 2250/244 All polymers belonging to those covered by group B32B27/36
• CPC Class Codes: B32B 2250/246 All polymers belonging to those covered by groups B32B27/32 and B32B27/30
• CPC Class Codes: B32B 2250/40 Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
• CPC Class Codes: B32B 2307/306 Resistant to heat
• CPC Class Codes: B32B 2307/40 having particular optical properties light or UV resistant B32B2307/71
• CPC Class Codes: B32B 2307/402 Coloured
• CPC Class Codes: B32B 2307/42 Polarizing, birefringent, filtering
• CPC Class Codes: B32B 2307/514 Oriented
• CPC Class Codes: B32B 2307/516 mono-axially
• CPC Class Codes: B32B 2307/71 Resistive to light or to UV
• CPC Class Codes: B32B 2307/724 Permeability to gases, adsorption
• CPC Class Codes: B32B 2307/7242 Non-permeable
• CPC Class Codes: B32B 2307/732 Dimensional properties
• CPC Class Codes: B32B 2439/40 Closed containers
• CPC Class Codes: B32B 2439/70 Food packaging
• CPC Class Codes: B32B 2439/80 : Medical packaging
• CPC Class Codes: B32B 2519/00 : Labels, badges
• CPC Class Codes: B32B 2553/00 : Packaging equipment or accessories not otherwise provided for
• 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 27/08 : of synthetic resin
• CPC Class Codes: B32B 27/18 : characterised by the use of special additives
• CPC Class Codes: B32B 27/28 : comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
• CPC Class Codes: B32B 27/30 : comprising vinyl (co)polymers; comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/302 : comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
• CPC Class Codes: B32B 27/304 : comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
• CPC Class Codes: B32B 27/306 : comprising vinyl acetate or vinyl alcohol (co)polymers
• CPC Class Codes: B32B 27/32 : comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B32B 27/34 : comprising polyamides
• CPC Class Codes: B32B 27/36 : comprising polyesters
• CPC Class Codes: B32B 27/365 : comprising polycarbonates
• CPC Class Codes: B32B 27/40 : comprising polyurethanes
• CPC Class Codes: B32B 27/42 : comprising condensation resins of aldehydes, e.g. with phenols, ureas or melamines
• CPC Class Codes: B32B 3/263 : characterised by a layer having non-uniform thickness
• CPC Class Codes: B32B 3/266 : characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
• CPC Class Codes: B32B 7/023 : Optical properties
• CPC Class Codes: B32B 7/04 : Interconnection of layers
• CPC Class Codes: B32B 7/12 : using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: B65D 65/40 : Applications of laminates for particular packaging purposes B65D1/0215, B65D1/28, B65D3/22, B65D5/0281, B65D5/563, B65D9/30, B65D29/02, B65D31/02, B65D75/26, B65D77/2024, B65D81/1275, B65D81/3811, B65D81/3823, B65D81/3834, B65D81/3846, B65D81/3858, B65D81/3874, B65D81/3886, B65D81/3897 take precedence; laminates per se or laminated packages characterised by the composition or
• CPC Class Codes: B65D 81/30 : by excluding light or other outside radiation wrappers B65D65/16
• CPC Class Codes: C08J 2329/04 : Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
• CPC Class Codes: C08J 2367/02 : Polyesters derived from dicarboxylic acids and dihydroxy compounds; C08J2367/06 takes precedence
• CPC Class Codes: C08J 2429/04 : Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
• CPC Class Codes: C08J 2467/04 : Polyesters derived from hydroxy carboxylic acids, e.g. lactones C08J2467/06 takes precedence
• CPC Class Codes: C08J 5/128 : Adhesives without diluent
• CPC Class Codes: C08J 5/18 : Manufacture of films or sheets
• CPC Class Codes: C09J 129/04 : Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
• CPC Class Codes: C09J 133/06 : of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
• CPC Class Codes: C09J 2429/00 : Presence of polyvinyl alcohol
• CPC Class Codes: C09J 5/06 : involving heating of the applied adhesive
• CPC Class Codes: C09J 7/35 : Heat-activated
• CPC Class Codes: G02B 5/3041 : comprising multiple thin layers, e.g. multilayer stacks
• CPC Class Codes: Y02W 90/10 : Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

Abstract

Disclosed in the present invention is a packaging composite material comprising polarizing films, the packaging composite material comprising: a polarizing layer, comprising two or more layers of polarizing film, wherein polarization directions of at least two layers of polarizing film have an included angle which is not 0°. The packaging composite material of the present invention has a simple structure, strong light-blocking properties, a high light-blocking rate, and a broad-spectrum light-blocking effect. Also disclosed in the present invention are the use of the packaging composite material in packaging, and the use of the packaging composite material in a label. When used as packaging or a label, the packaging composite material can extend the shelf life of products which need to be stored in the dark.

Claims

1. A packaging composite material comprising polarizing films, wherein it comprises:

a polarizing layer, comprising two or more layers of polarizing film;

wherein polarization directions of at least two layers of polarizing film have an included angle which is not 0°

.

2. The packaging composite material as claimed in claim 1, wherein the packaging composite material further comprises a first surface layer located on one side of the polarizing layer.

3. The packaging composite material as claimed in claim 2, wherein the packaging composite material further comprises a second surface layer located on another side of the polarizing layer.

4. The packaging composite material as claimed in claim 3, wherein a material of the surface layer is selected from one of PE, PETG, PVC, PVA, PC, PP, PS, PET, PBT, EVA, EVOH, PLA, PEF, PEN, PCTG, PBAT, PBST, PVDC and PA.

5. The packaging composite material as claimed in claim 1, wherein the polarizing layer further comprises a polarizing film bonding layer located between the polarizing films.

6. The packaging composite material as claimed in claim 5, wherein a material of the polarizing film bonding layer is selected from one of polyvinyl alcohol adhesives, acrylate adhesives, ethylene-vinyl acetate copolymer adhesives, epoxy resin adhesives, unsaturated polyester adhesives and vinyl acetate resin adhesives.

7. The packaging composite material as claimed in claim 2, wherein the packaging composite material further comprises a surface layer bonding layer located between the polarizing layer and the first surface layer.

8. The packaging composite material as claimed in claim 3, wherein the packaging composite material further comprises surface layer bonding layers located between the polarizing layer and the first and second surface layers respectively.

9. The packaging composite material as claimed in claim 7, wherein a material of the surface layer bonding layer is selected from one of polyvinyl alcohol adhesives, acrylate adhesives, ethylene-vinyl acetate copolymer adhesives, epoxy resin adhesives, unsaturated polyester adhesives and vinyl acetate resin adhesives.

10. The packaging composite material as claimed in claim 1, wherein

polarization directions of at least two layers of polarizing film have an included angle of 45°

-135°

, preferably 80°

-100°

, more preferably 90°

.

11. The packaging composite material as claimed in claim 10, wherein amongst the polarizing films, polarization directions of at least two polarizing films have an included angle which is not 0°

.

12. The packaging composite material as claimed in claim 1, wherein the polarizing layer comprises 2-10 layers of polarizing film, preferably 2-6 layers of polarizing film.

13. The use of the packaging composite material comprising polarizing films as claimed in claim 1 in packaging.

14. The use as claimed in claim 13, wherein the packaging composite material comprising polarizing films comes into direct contact with contents.

15. The use of the packaging composite material comprising polarizing films as claimed in claim 1 in a label.

16. The use as claimed in claim 13, wherein in the packaging composite material comprising polarizing films, the thickness of the polarizing layer is 20 nm-10 mm, and the thickness of each polarizing film is 10 nm-1 mm;

preferably, the thickness of the polarizing layer is 20 nm-1 mm, and the thickness of each polarizing film is 10 nm-100 microns.

17. The packing composite material as claim in claim 8, wherein a material of the surface bonding layers is selected from one of polyvinyl alcohol adhesives, acrylate adhesives, ethylene-vinyl acetate copolymer adhesives, epoxy resin adhesives, unsaturated polyester adhesives and vinyl acetate resin adhesives.

18. The use as claimed in claim 15, wherein in the packaging composite material comprising polarizing films, the thickness of the polarizing layer is 20 nm-10 mm, and the thickness of each polarizing film is 10 nm-1 mm;

preferably, the thickness of the polarizing layer is 20 nm-1 mm, and the thickness of each polarizing film is 10 nm-100 microns.