Infrared reflective film

• US 10,288,782 B2
• Filed: 01/30/2014
• Issued: 05/14/2019
• Est. Priority Date: 01/31/2013
• Status: Active Grant

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Watanabe, Masahiko, Ohmori, Yutaka
• Primary Examiner(s): Collins, Darryl J
• Assistant Examiner(s): Sumlar, Journey F
• Application Number:
  US14/765,296
• Publication Number:
  US 20160003989A1
• Time in Patent Office: 1,930 Days
• Field of Search: None
• CPC Class Codes: C23C 14/08 Oxides C23C14/10 takes precedence
• CPC Class Codes: C23C 14/086 of zinc, germanium, cadmium, indium, tin, thallium or bismuth
• CPC Class Codes: C23C 14/14 Metallic material, boron or silicon
• CPC Class Codes: G02B 1/04 made of organic materials, e.g. plastics G02B1/08 takes precedence
• CPC Class Codes: G02B 1/14 Protective coatings, e.g. hard coatings
• CPC Class Codes: G02B 5/0875 the reflecting layers comprising two or more metallic layers
• CPC Class Codes: G02B 5/208 for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
• CPC Class Codes: G02B 5/26 Reflecting filters G02B5/28 takes precedence
• CPC Class Codes: G02B 5/282 reflecting for infrared and transparent for visible light, e.g. heat reflectors, laser protection

Abstract

Disclosed is an infrared reflective film (100) configured by disposing an infrared ray reflective layer (20) and a transparent protective layer (30) on a transparent film backing (10) in this order. The infrared ray reflective layer (20) comprises: a first metal oxide layer (21); a metal layer (25) comprising a primary component consisting of silver; and a second metal oxide layer (22) comprised of a composite metal oxide containing zinc oxide and tin oxide, which are arranged in this order from the side of the transparent film backing (10). The transparent protective layer (30) lies in direct contact with the second metal oxide layer (22). The transparent protective layer (30) has a thickness of 30 nm to 150 nm, and is preferably an organic layer having a cross-linked structure derived from an ester compound having an acidic group and a polymerizable functional group in the same molecule.

Claims

1. An infrared reflective film configured by disposing an infrared ray reflective layer and a transparent protective layer on a transparent film backing in this order,

wherein the infrared ray reflective layer comprises:

a first metal oxide layer;

a metal layer comprising a primary component consisting of silver; and

a second metal oxide layer comprised of a composite metal oxide containing zinc oxide and tin oxide, which are arranged in this order from a side of the transparent film backing,

and wherein the transparent protective layer lies in direct contact with the second metal oxide layer, and has a thickness of 30 nm to 150 nm, the transparent protective layer being an organic layer having a cross-linked structure derived from an ester compound having an acidic group and a polymerizable functional group in the same molecule, an amount of the ester compound-derived structure contained in the transparent protective layer being 1 to 40 weight %.

2. The infrared reflective film as recited in claim 1, wherein the ester compound is an ester compound of a phosphoric acid with an organic acid having a polymerizable functional group.

3. The infrared reflective film as recited in claim 2, wherein a normal emissivity as measured from the side of the transparent protective layer is 0.2 or less.

4. The infrared reflective film as recited in claim 2, wherein the polymerizable functional group comprises a (meth) acryloyl group.

5. The infrared reflective film as recited in claim 1, wherein a normal emissivity as measured from the side of the transparent protective layer is 0.2 or less.

6. The infrared reflective film as recited in claim 1, wherein the ester compound is a phosphoric monoester compound.

7. The infrared reflective film as recited in claim 1, wherein the ester compound is a phosphoric diester compound.

8. The infrared reflective film as recited in claim 1, wherein the ester compound is a combination of a phosphoric monoester compound and a phosphoric diester compound.

9. The infrared reflective film as recited in claim 1, wherein the transparent protective layer comprises at least one of a coupling agent, a leveling agent, an ultraviolet absorber, an antioxidant, a stabilizer, a plasticizer, a coloration inhibitor, a flame retardant, or an antistatic agent.

10. The infrared reflective film as recited in claim 9, wherein the coupling agent comprises at least one of a silane coupling agent or a titanium coupling agent.

11. The infrared reflective film as recited in claim 9, wherein the stabilizer is a heat stabilizer.

12. The infrared reflective film as recited in claim 1, wherein the amount of the ester compound-derived structure contained in the transparent protective layer is from 1.5 to 35 weight %.

13. The infrared reflective film as recited in claim 1, wherein the amount of the ester compound-derived structure contained in the transparent protective layer is from 2 to 20 weight %.

14. The infrared reflective film as recited in claim 1, wherein the amount of the ester compound-derived structure contained in the transparent protective layer is from 2.5 to 17.5 weight %.

15. The infrared reflective film as recited in claim 1, wherein the thickness of the transparent protective layer is 35 to 130 nm.

16. The infrared reflective film as recited in claim 1, wherein the thickness of the transparent protective layer is from 40 to 110 nm.

17. The infrared reflective film as recited in claim 1, wherein a normal emissivity as measured from the side of the transparent protective layer is 0.15 or less.

18. The infrared reflective film as recited in claim 1, wherein a normal emissivity as measured from the side of the transparent protective layer is 0.12 or less.

19. The infrared reflective film as recited in claim 1, wherein a visible ray transmittance of the infrared reflective film is 60% or more.

20. The infrared reflective film as recited in claim 1, wherein a visible ray transmittance of the infrared reflective film is 65% or more.