Infrared control film and window

Patent metadata

Field	Value
Publication number	US-10585300-B2
Application number	US-201815986967-A
Country	US
Kind code	B2
Filing date	May 23, 2018
Priority date	Nov 24, 2015
Publication date	Mar 10, 2020
Grant date	Mar 10, 2020

Abstract

Provided are: an infrared control film in which an infrared light transmittance changes depending on the temperature, a tint in a front direction is excellent, and durability is excellent; and a window including the infrared control film. The infrared control film includes: a liquid crystal layer; and two substrates each of which includes at least one of an ultraviolet absorber or a colorant, in which the liquid crystal layer is disposed between the two substrates, the substrate includes 0.001 mass % or higher of the ultraviolet absorber or the colorant, a transmittance of the infrared control film at 0° C. with respect to an incidence ray at 1000 nm at a polar angle of 0° is higher than 70%, a transmittance of the infrared control film at 40° C. with respect to an incidence ray at 1000 nm at a polar angle of 0° is lower than 60%, and the following expressions are satisfied: 0.8<a1<1.2, 0.8<b1<1.2, a1=(Transmittance of Incidence Ray at 450 nm at Polar Angle of 0°)/(Transmittance of Incidence Ray at 550 nm at Polar Angle of 0°), b1=(Transmittance of Incidence Ray at 550 nm at Polar Angle of 0°)/(Transmittance of Incidence Ray at 700 nm at Polar Angle of 0°).

First claim

What is claimed is:

1. An infrared control film comprising:
at least one liquid crystal layer; and
two substrates each of which includes at least one of an ultraviolet absorber or a colorant,
wherein the liquid crystal layer is disposed between the two substrates,
the substrate includes 0.001 mass % or higher of the ultraviolet absorber or the colorant with respect to a total mass of the substrate,
a transmittance of the infrared control film at 0° C. with respect to an incidence ray at 1000 nm at a polar angle of 0° is higher than 70%,
a transmittance of the infrared control film at 40° C. with respect to an incidence ray at 1000 nm at a polar angle of 0° is lower than 60%, and
the following Expression (1-a) and the following Expression (1-b) are satisfied,
0.8< a 1<1.2  Expression (1-a),

0.8< b 1<1.2  Expression (1-b),

a1=(Transmittance of Incidence Ray at 450 nm at Polar Angle of 0°)/(Transmittance of Incidence Ray at 550 nm at Polar Angle of 0°), and
b1=(Transmittance of Incidence Ray at 550 nm at Polar Angle of 0°)/(Transmittance of Incidence Ray at 700 nm at Polar Angle of 0°).

2. The infrared control film according to claim 1 ,
wherein the following Expression (2-a) and the following Expression (2-b) are satisfied,
0.8< a 2<1.2  Expression (2-a),

0.8< b 2<1.2  Expression (2-b),

a2=(Transmittance of Incidence Ray at 450 nm at Polar Angle of 60°)/(Transmittance of Incidence Ray at 550 nm at Polar Angle of 60°), and
b2=(Transmittance of Incidence Ray at 550 nm at Polar Angle of 60°)/(Transmittance of Incidence Ray at 700 nm at Polar Angle of 60°).

3. The infrared control film according to claim 1 ,
wherein the liquid crystal layer includes at least one liquid crystal compound and at least one chiral agent.

4. The infrared control film according to claim 1 ,
wherein a haze of the infrared control film at −20° C. is 3% or lower.

5. The infrared control film according to claim 1 ,
wherein the liquid crystal layer includes three or more liquid crystal compounds.

6. The infrared control film according to claim 1 ,
wherein the liquid crystal layer has a phase transition point between a smectic liquid crystal phase and a cholesteric liquid crystal phase in a temperature range of higher than 25° C. and 40° C. or lower.

7. The infrared control film according to claim 1 ,
wherein the liquid crystal layer is in a smectic liquid crystal phase in a temperature range of −20° C. to 25° C.

8. The infrared control film according to claim 1 ,
wherein the liquid crystal layer includes a disk-shaped liquid crystal compound represented by the following Formula (1),
D (- L - P ) n   Formula (1)

in Formula (1), D represents a disk-shaped core, L represents a divalent linking group, P represents a polymerizable group or an alkyl chain having 2 to 10 carbon atoms, and n represents an integer of 4 to 12.

9. The infrared control film according to claim 1 ,
wherein the liquid crystal layer includes an alignment start temperature lowering agent.

10. The infrared control film according to claim 1 ,
wherein a thickness of the liquid crystal layer is 15 μm or less.

11. The infrared control film according to claim 1 , further comprising:
an aligned film that is in direct contact with the liquid crystal layer.

12. The infrared control film according to claim 11 ,
wherein the aligned film is a photo-alignment film.

13. The infrared control film according to claim 11 ,
wherein a thickness of the aligned film is 3.0 μm or less.

14. A roll which is obtained by winding the infrared control film according to claim 1 in a roll shape.

15. A window comprising:
the infrared control film according to claim 1 .

Assignees

• Fujifilm Corp

Inventors

• Akutagawa Nobuyuki
• Takeda Jun

Classifications

• C09K19/50

  containing steroidal liquid crystal compounds · CPC title

• B32B27/288

  comprising polyketones · CPC title

• C09K2219/13

  used in the technical field of thermotropic switches · CPC title

• B32B27/34

  comprising polyamides · CPC title

• C09K19/3491

  having sulfur as hetero atom · CPC title