Light transparent fluoropolymer composition and article

Patent metadata

Field	Value
Publication number	US-10836883-B2
Application number	US-201515318556-A
Country	US
Kind code	B2
Filing date	Jun 3, 2015
Priority date	Jun 18, 2014
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

Light transparent fluoropolymer composition having less than 2 percent haze, comprising at least one of alkali metal (e.g., lithium, sodium, and potassium) cation, alkali metal (e.g., lithium, sodium, and potassium) and a corresponding anion (e.g., CO 3 ,OH, OOCCH 3 ), alkaline earth metal cation (e.g., calcium, magnesium, strontium, and barium), or alkaline earth metal cation (e.g., calcium, magnesium, strontium, and barium) and a corresponding anion (e.g., CO 3 ,OH, OOCCH 3 ), wherein the light transparent fluoropolymer has at least 90% visible light transmission. Exemplary uses of light transparent fluoropolymer compositions described herein include as films (e.g., solar reflective films, solar transparent frontside photovoltaic films, commercial graphic overlay film, commercial graphic film, and tubing (e.g., transparent tubing for medical)).

First claim

What is claimed is:

1. A multilayer optical film comprising at least 5 layers, wherein the optical film comprises an optical stack with alternating film layers of:
a first film layer comprising a light transparent fluoropolymer composition wherein the fluoropolymer composition comprises at least one fluoropolymer and 0.01 to 1 percent by weight, based on the total weight of the fluoropolymer composition, of at least one of:
an alkali metal cation,
an alkali metal and a corresponding anion,
an alkaline earth metal cation, and
an alkaline earth metal and a corresponding anion,
wherein the first film layer has at least 95% visible light transmission and less than 2 percent haze; and
a second polymeric film layer.

2. The optical film of claim 1 , wherein 0.05 to 1 percent by weight of the alkali metal ions and alkaline earth metal ions are present in the fluoropolymer composition, based on the total weight of the composition.

3. The optical film of claim 1 , wherein the fluoropolymer is at least one of homopolymers of tetrafluoroethylene, copolymers of ethylene and tetrafluoroethylene copolymers; copolymers of tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride; homopolymers of vinylidene fluoride; copolymers of vinylidene fluoride; homopolymers of vinyl fluoride; copolymers of hexafluoropropylene and tetrafluoroethylene; copolymers of tetrafluoroethylene and propylene; copolymers of tetrafluoroethylene and (perfluorovinyl) ether; copolymers of tetrafluoroethylene, (perfluorovinyl) ether, and (perfluoromethyl vinyl) ether; copolymers of hexafluoropropylene, tetrafluoroethylene, and ethylene; homopolymers of chlorotrifluoroethylene; copolymers of ethylene and chlorotrifluoroethylene; homopolymers of hexafluoropropylene oxide; homopolymers of 4-fluoro-(2-trifluoromethyl)styrene; copolymers of tetrafluoroethylene and norbornene; or copolymers of hexafluoropropylene and vinylidene fluoride.

4. The optical film of claim 1 , wherein the fluoropolymer composition further comprises polymethylmethacrylate.

5. The optical film of claim 1 , wherein the fluoropolymer composition further comprises at least one ultraviolet absorber.

6. The optical film of claim 1 , wherein the fluoropolymer composition further comprises at least one hindered amine light stabilizer.

7. The optical film of claim 1 , wherein the optical film has an anti-reflective, structured major surface.

8. The optical film of claim 1 , wherein the optical film has an elongation at break of 10% to 200% at 25° C.

9. The optical film of claim 1 , wherein the second polymeric film layer is chosen from polymethylmethacrylate (PMMA), polyethyl methacrylate (PEMA), copolymers of PMMA (CoPMMA), polyolefin copolymers, functionalized polyolefins, and combinations thereof.

10. The optical film of claim 1 , wherein the alkali metal is chosen from lithium, sodium, and potassium.

11. The optical film of claim 1 , wherein the alkaline earth metal is chosen from calcium, magnesium, strontium and barium.

12. The optical film of claim 10 , wherein the alkaline earth metal is calcium, and the corresponding anion is chosen from CO 3 , OH, and OOCCH 3 .

13. The optical film of claim 12 , wherein the alkaline earth metal and corresponding anion comprise CaCO 3 .

14. The optical film of claim 12 , wherein the alkaline earth metal and corresponding anion is CaCO 3 .

15. The optical film of claim 1 , further comprising protective, non-optical skin layers on opposed major surfaces of the optical stack.

16. The optical film of claim 15 , wherein the non-optical skin layers comprise an ultraviolet absorber.

17. The optical film of claim 1 , wherein the optical stack comprises at least 50 layers.

18. The optical film of claim 1 , wherein the optical stack comprises at least 100 layers.

19. A multilayer optical film comprising at least 100 layers, wherein the optical film comprises an optical stack with alternating film layers of:
a first film layer comprising a fluoropolymer composition comprising at least one fluoropolymer and 0.01 to 1 percent by weight, based on the total weight of the fluoropolymer composition, of an alkaline earth metal chosen from calcium, magnesium, strontium and barium, and a corresponding anion chosen from CO 3 , OH, and OOCCH 3 , and wherein the first film layer has at least 95% visible light transmission and less than 2 percent haze; and
a second polymeric film layer chosen from polymethylmethacrylate (PMMA), polyethyl methacrylate (PEMA), copolymers of PMMA (CoPMMA), polyolefin copolymers, functionalized polyolefins, and combinations thereof.

20. The optical film of claim 19 , wherein the alkaline earth metal is calcium, and the corresponding anion is CO 3 .

Assignees

• 3M Innovative Properties Co

Inventors

• Hebrink Timothy J

Classifications

• C08L33/12

  Homopolymers or copolymers of methyl methacrylate · CPC title

• C08K2003/262

  Alkali metal carbonates · CPC title

• C08K3/26 Primary

  Carbonates; Bicarbonates · CPC title

• C08K2003/265

  Calcium, strontium or barium carbonate · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title