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1. (WO2010078064) FLUOROPOLYMERIC MULTILAYER OPTICAL FILM AND METHODS OF MAKING AND USING THE SAME
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What is claimed is:

1. A multilayer optical film comprising an optical stack, wherein the optical stack comprises: a) first optical layers comprising a first fluoropolymeric material; and b) second optical layers comprising a second fluoropolymeric material, wherein at least a portion of the first optical layers and at least a portion of the second optical layers are in intimate contact.

2. A multilayer optical film according to claim 1, wherein the refractive index difference between the first fluoropolymeric material and the second fluoropolymeric material is less than 0.20.

3. A multilayer optical film according to any one of the previous claims, wherein the refractive index difference between the first fluoropolymeric material and the second fluoropolymeric material is less than 0.10.

4. A multilayer optical film according to any one of the previous claims, wherein the fluoropolymeric material comprises a homopolymer or a copolymer derived from interpolymerized units of at least one of the following monomers: TFE, VDF, VF,

HFP, CTFE, fluoroalkyl vinyl ethers, fluoroalkoxy vinyl ethers, fluorinated styrenes, HFPO, fluorinated siloxanes, or combinations thereof.

5. A multilayer optical film according to any one of the previous claims, wherein the fluoropolymeric material is selected from the group consisting of: copolymers of ethylene and tetrafluoroethylene; copolymers of tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride; homopolymers of vinylidene fluoride; copolymers of vinylidene fluoride; copolymers of tetrafluoroethylene and propylene; copolymers of tetrafluoroethylene and perfluoro 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; and copolymers of tetrafluoroethylene and norbornene.

6. A multilayer optical film according to any one of the previous claims wherein the optical stack comprise layer pairs selected from the group consisting of: homopolymers of vinylidene fluoride and (copolymers of tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride) layer pairs; (copolymers of ethylene and chlorotrifluoroethylene) and (copolymers of tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride) layer pairs; (copolymers of hexafluoropropylene, tetrafluoroethylene, and ethylene) and (copolymers of tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride) layer pairs; (copolymers of hexafluoropropylene, tetrafluoroethylene, and ethylene) and (copolymers of ethylene and tetrafluoroethylene) layer pairs; (copolymers of hexafluoropropylene, tetrafluoroethylene, and ethylene) and (copolymers of tetrafluoroethylene and norbornene) layer pairs; and (copolymers of ethylene and tetrafluoroethylene) and (copolymers of tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride) layer pairs.

7. A multilayer optical film according to any one of the previous claims wherein at least one of the first fluoropolymeric material or the second fluoropolymeric material is birefringent.

8. A multilayer optical film according to any one of the previous claims wherein the optical stack comprises at least 5 first optical layers and at least 5 second optical layers.

9. A multilayer optical film according to any one of the previous claims wherein the optical stack comprises at least 50 first optical layers and at least 50 second optical layers.

10. A multilayer optical film according to any one of the previous claims wherein the multilayer optical film comprises a draw ratio, wherein the overall draw ratio is greater than 3:1.

11. A multilayer optical film according to any one of the previous claims wherein the overall draw ratio is greater than 4:1.

12. A multilayer optical film according to any one of the previous claims wherein the overall draw ratio is greater than 6:1.

13. A multilayer optical film according to any one of the previous claims further comprising at least one of the following: a) a printing; b) an adhesive; c) a tear resistant layer; d) a UV-absorbing layer; e) a skin layer; or f) a protective boundary layer.

14. A multilayer optical film according to any one of the previous claims, further comprising a UV-absorbing compound, an IR-absorbing compound, or combinations thereof, wherein the first optical layers, the second optical layers, or an optional additional layer comprises the UV-absorbing compound, an IR- absorbing compound, or combinations thereof.

15. A multilayer optical film according to any one of the previous claims, further comprising a functional additive, optionally, wherein the functional additive is a processing additive.

16. A multilayer optical film according to any one of the previous claims, wherein the multilayer film transmits at least one of the following: a) at least a portion of the wavelengths between about 400-700 nm;

b) at least a portion of the wavelengths greater than about 700 nm; c) at least a portion of the wavelengths less than about 300 nm or d) at least a portion of the wavelengths between about 300-400 nm.

17. A multilayer optical film according to any one of the previous claims, wherein the multilayer film reflects at least one of the following: a) at least a portion of the wavelengths between about 400-700 nm; b) at least a portion of the wavelengths greater than about 700 nm; c) at least a portion of the wavelengths less than about 300 nm; or d) at least a portion of the wavelengths between about 300-400 nm.

18. An article comprising the multilayer optical film according to any one of the previous claims.

19. A method of using a multilayer optical film, wherein the article according claim 18 is used in at least one of the following: a) solar power technology; b) lighting applications; c) antireflection applications; or d) industrial applications.

20. A method of making a multilayer optical film comprising: a) providing a first optical layer comprising fluoropolymeric material; and b) providing a second optical layer comprising fluoropolymeric material. c) coextruding the first optical layer and the second optical layer into a web; and d) alternately layering the first optical layers and the second optical layers to create an multilayer film.

21. The method of claim 20 wherein at least one of first optical layers or second optical layers is birefringent.