LOW EMISSIVITY FILM

• US 20100173145A1
• Filed: 05/21/2008
• Published: 07/08/2010
• Est. Priority Date: 05/24/2007
• Status: Active Grant

• Current Assignee: Innovia Films Limited (Innovia Films)
• Original Assignee: Innovia Films Limited (Innovia Films)
• Inventors: Watters, Paul, Marshall, Colin
• Granted Patent: US 9,822,229 B2
• Time in Patent Office: Days
• US Class Current: 428/315.500
• CPC Class Codes: C08J 2475/00 Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
• CPC Class Codes: C08J 7/0427 with only one layer of a composition containing a polymer binder with more layers C08J7/042
• CPC Class Codes: C08J 7/043 Improving the adhesiveness of the coatings per se, e.g. forming primers adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50
• CPC Class Codes: C08J 7/048 Forming gas barrier coatings
• CPC Class Codes: C08K 3/08 Metals
• CPC Class Codes: C09D 5/38 Paints containing free metal not provided for above in groups C09D5/00 - C09D5/36
• CPC Class Codes: C09D 7/61 inorganic
• CPC Class Codes: C09D 7/70 characterised by shape, e.g. fibres, flakes or microspheres
• CPC Class Codes: Y10T 428/249978 Voids specified as micro
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/273 of coating
• CPC Class Codes: Y10T 428/31544 Addition polymer is perhalogenated
• CPC Class Codes: Y10T 428/31609 Particulate metal or metal compound-containing
• CPC Class Codes: Y10T 428/31678 Of metal

Abstract

The present invention concerns a functional film material comprising a substrate layer and a coating layer, the coating layer comprising a block copolymeric binder and a particulate metal pigment therein, the ratio of pigment to binder in the coating layer being selected with reference to the coat weight to provide the functional film material with an emissivity of less than 0.5, and the substrate and coating layer being selected to provide the film with a VWTR (ambient) in excess 400 gm⁻²d^{−1 bar−1}.

Claims

1. A functional film material comprising a substrate layer and a coating layer, the coating layer comprising a block copolymeric binder and a particulate metal pigment therein, the ratio of pigment to binder in the coating layer being selected with reference to the coat weight to provide the functional film material with an emissivity 0.5 or less and the substrate and coating layer being selected to provide the film with a WVTR (ambient) in excess of 400 gm⁻

2d<sup>−

1</sup>bar<sup>−

1</sup>.

2. A functional film material according to claim 1 wherein the substrate layer has a WVTR (ambient) in excess of 400 gm⁻

2d<sup>−

1</sup>bar<sup>−

1</sup>.

3. A functional film material according to claim 1 or claim 2 wherein the substrate layer has an oxygen permeability (OTR) of less than about 30 cm³m⁻

2d⁻

bar<sup>−

1</sup>.

4. A functional film material according to any one of claims 1 to 3 wherein the substrate layer is selected from cellulose and derivatives thereof, regenerated cellulose (Cellophane™

, cupammonium cellulose), benzoylated cellulose, collagen, polyurethanes and Goretex™

.

5. A functional film material according to claim 4 wherein the substrate layer is cellulose acetate.

6. A functional film material according to claim 4 wherein the substrate layer is regenerated cellulose.

7. A functional film material according to any one of claims 1 to 6 wherein the block copolymeric binder is selected from materials comprising a hard and soft segment polymer of the type designated for fabrics allowing breathability.

8. A functional film material according to claim 7 wherein the block copolymeric binder is selected from hydrophilic polyurethanes.

9. A functional film material according to any one of claims 1 to 8 wherein the particulate metal material is a polished metal material.

10. A functional film material according to claim 9 wherein the polished metal material is selected from aluminium, bronze, stainless steel, brass, gold, nickel, silver, silver coated glass, tin or copper, or mixtures of two or more thereof.

11. A functional film material according to any one of claims 1 to 10 wherein the particulate metal material has a predominantly lamellar or plate-like form.

12. A functional film material according to claim 11 wherein the median aspect ratio of the particulate metal material is at least about 10:

1

13. A functional film according to any one of claims 1 to 12 wherein the emissivity of the film is less than about 0.45.

14. A functional film according to claim 13 wherein the emissivity of the film is less than about 0.4.

15. A functional film according to any one of claims 1 to 14 wherein the film substrate has a higher WVTR than the coating layer.

16. A functional film according to any one of claims 1 to 15 wherein the pigment to binder (p:

b) ratio in the coating layer is from about 3;

1 to about 1;

10.

17. A functional film according to any one of claims 1 to 16 wherein the coat weight is from about 0.8 to about 2.5 gm⁻

2.

18. A functional film material according to any one of claims 1 to 17 wherein the film or the substrate layer has a WVTR (ambient) in excess of 500 gm⁻

2d<sup>−

1</sup>bar<sup>−

1</sup>.

19. A functional film material according to claim 17 wherein the film or the substrate layer has a WVTR (ambient) in excess of 1000 gm⁻

2d<sup>−

1</sup>bar<sup>−

1</sup>.

20. A functional film material according to any one of claims 1 to 19 wherein at least one of the substrate and the coating is a semi-permeable membrane.

21. A functional film material according to any one of claims 1 to 20 wherein at least one of the substrate and the coating is microporous.