Film and layered body having specified thickness ratios of thermoplastic layers

Patent metadata

Field	Value
Publication number	US-11360251-B2
Application number	US-201716316106-A
Country	US
Kind code	B2
Filing date	Jun 23, 2017
Priority date	Jul 15, 2016
Publication date	Jun 14, 2022
Grant date	Jun 14, 2022

Abstract

The present invention is a film having at least one reflection band in which the reflectance is 30% or greater continuously in at least a 100-nm range in a wavelength range of 1200-1800 nm when light is incident from at least one side, the mean transmittance in a wavelength range of 430-600 nm is 70% or greater, and the average value of the axial rigidity of the film in the principal orientation axis direction of the film and in the direction orthogonal thereto is 45 N/m or less.

First claim

The invention claimed is:

1. A film having at least one reflection band where a reflectance of 30% or more is maintained over a continuous part covering 100 nm or more in a wavelength range of 1,200 to 1,800 nm for incident light entering at least from one side,
wherein the film has an average transmittance of 70% or more over a wavelength range of 430 to 600 nm, and has an average axial rigidity between the main orientation axis direction of the film and the direction perpendicular thereto of 10 kN/m or more and 45 kN/m or less, wherein:
the film has a lamination unit 1 in which layers (A-layers) containing a thermoplastic resin A as a primary component and layers (B-layers) containing a thermoplastic resin B as a primary component are stacked alternately to meet the requirement (i) described below; and
the film has a lamination unit 2 in which layers (C-layers) containing a thermoplastic resin C as a primary component and layers (D-layers) containing a thermoplastic resin D as a primary component are stacked alternately to meet the requirement (ii) described below:
(i) any A-layer and B-layer located adjacent to each other have a thickness ratio (thickness of A-layer/thickness of B-layer) of 0.7 or more and 1.4 or less;
(ii) compared to the thinnest layer (having a thickness ratio of 1) of three layers located adjacent to each other, one of the other two layers has a thickness ratio of 1.0 or more and 1.4 or less whereas the remaining layer has a thickness ratio of 5 or more and 9 or less.

2. The film as set forth in claim 1 , wherein the average transmittance in a wavelength range of 400 to 800 nm is 80% or more at least for incident light coming through either surface.

3. The film as set forth in claim 1 , wherein the total thickness d1 of the lamination unit 1 is 5 μm or more.

4. The film as set forth in claim 1 , wherein the total thickness d2 of the lamination unit 2 is 20 μm or more.

5. The film as set forth in claim 1 , wherein the thermoplastic resins A and C are crystalline resins and the thermoplastic resins B and D are amorphous resins.

6. The film as set forth in claim 1 , wherein in either the lamination unit 1 or the lamination unit 2 , or both the lamination unit 1 and the lamination unit 2 , the total layer thickness of continuously located six layers has a layer thickness distribution in the thickness direction of the film.

7. The film as set forth in claim 1 , having a region in which the total layer thickness of mutually adjacent six layers in the lamination unit 1 decreases gradually from either surface toward the central portion.

8. The film as set forth in claim 1 , having a region in which the total layer thickness of mutually adjacent six layers in the lamination unit 2 decreases gradually from either surface toward the central portion.

9. The film as set forth in claim 1 , having a region in which the total layer thickness of mutually adjacent six layers in the lamination unit 1 decreases gradually from either surface toward the central portion, and having a region in which the total layer thickness of mutually adjacent six layers in the lamination unit 2 decreases gradually from either surface toward the central portion.

10. The film as set forth in claim 1 , containing a layer having a layer thickness of 1 μm or more.

11. The film as set forth in claim 1 , wherein the total thickness d1 (μm) of the lamination unit 1 and the total thickness d2 (μm) of the lamination unit 2 meet the equation (1) or (2) given below:
0.4≤ d 1/( d 1+ d 2)<1  equation (1)

0.01≤ d 1/( d 1+ d 2)<0.4  equation (2).

12. The film as set forth in claim 1 , wherein the film thickness is 100 μm or less.

13. The film as set forth in claim 10 , wherein the average reflectance in the wavelength range of 900 to 1,400 nm is 70% or more at least for incident light coming through either surface.

14. The film as set forth in claim 1 , wherein the average reflectance in the wavelength range of 900 nm to 1,800 nm is 70% or more at least for incident light coming through either surface.

15. A layered body containing the film as set forth in claim 1 , a hard coat layer located in close proximity to at least either side thereof, and a sticking layer attached on the other side thereof.

16. A layered body having the film as set forth in claim 1 and a hard coat layer located in close proximity to at least either side thereof and having visible light transmittance of 70% or more and total solar energy transmittance of 50% or less as specified in ISO9050, wherein the hard coat layer contains a heat ray absorbent.

17. The layered body as set forth in claim 16 , wherein the heat ray absorbent contains a tungsten oxide component.

18. The layered body as set forth in claim 16 , wherein the hard coat layer has a thickness of 0.1 μm or more and 50 μm or less.

Assignees

• Toray Industries

Inventors

• Arike Takafumi
• Masuda Yoshihiro
• Aoyama Shigeru

Classifications

• G02B5/282 Primary

  reflecting for infrared and transparent for visible light, e.g. heat reflectors, laser protection · CPC title

• G02B5/0841

  comprising organic materials, e.g. polymers · CPC title

• B32B27/00 Primary

  Layered products comprising {a layer of} synthetic resin {(fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18)} · CPC title

• G02B5/208

  for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation · CPC title

• G02B5/26 Primary

  Reflecting filters (G02B5/28 takes precedence) · CPC title