Production method of light scattering film, light scattering film, polarizing plate, image display device, and transmissive/semi-transmissive liquid crystal display device
First Claim
1. A method for producing a light scattering film, comprising:
- casting onto a support a dope containing at least a thermoplastic resin and light transmitting particles to provide a casted film, and peeling and drying the casted film to prepare a light transmitting base material;
applying an coating solution containing at least a curable compound, a polymerization initiator, and a solvent onto the light transmitting base material and drying the solvent; and
curing the curable compound to form a cured layer,wherein at least one surface of the light transmitting base material has an asperity shape,the light transmitting particles have an average primary particle size greater than 2.5 μ
m but not greater than 12 μ
m,the cured layer has an average thickness of 0.1 μ
m or greater but not greater than 10.0 μ
m, andthe cured layer satisfies formulae (1) to (3);
0.05 μ
m≦
Ra≦
0.8 μ
m
(1)
10 μ
m≦
Sm≦
300 μ
m
(2)
1.5°
≦
θ
a≦
4.5°
(3)wherein Ra represents an arithmetic average roughness of the cured layer, Sm represents an average peak-to-valley distance of a surface of the cured layer, and θ
a represents an average inclination angle of the surface of the cured layer, each based on JIS B 0601.
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Accused Products
Abstract
A method for producing a light scattering film is provided and includes: casting onto a support a dope containing at least a thermoplastic resin and light transmitting particles to provide a casted film, and peeling and drying the casted film to prepare a light transmitting base material; applying an coating solution containing at least a curable compound, a polymerization initiator, and a solvent onto the light transmitting base material and drying the solvent; and curing the curable compound to form a cured layer. At least one surface of the light transmitting base material has an asperity shape, the light transmitting particles have an average primary particle size greater than 2.5 μm but not greater than 12 μm, the cured layer has an average thickness of 0.1 μm or greater but not greater than 10.0 μm, and the cured layer satisfies the specific formulae.
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Citations
16 Claims
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1. A method for producing a light scattering film, comprising:
-
casting onto a support a dope containing at least a thermoplastic resin and light transmitting particles to provide a casted film, and peeling and drying the casted film to prepare a light transmitting base material; applying an coating solution containing at least a curable compound, a polymerization initiator, and a solvent onto the light transmitting base material and drying the solvent; and curing the curable compound to form a cured layer, wherein at least one surface of the light transmitting base material has an asperity shape, the light transmitting particles have an average primary particle size greater than 2.5 μ
m but not greater than 12 μ
m,the cured layer has an average thickness of 0.1 μ
m or greater but not greater than 10.0 μ
m, andthe cured layer satisfies formulae (1) to (3);
0.05 μ
m≦
Ra≦
0.8 μ
m
(1)
10 μ
m≦
Sm≦
300 μ
m
(2)
1.5°
≦
θ
a≦
4.5°
(3)wherein Ra represents an arithmetic average roughness of the cured layer, Sm represents an average peak-to-valley distance of a surface of the cured layer, and θ
a represents an average inclination angle of the surface of the cured layer, each based on JIS B 0601.- View Dependent Claims (3)
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2. A method for producing a light scattering film, comprising:
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casting onto a support a dope containing at least a thermoplastic resin and light transmitting particles to provide a casted film, and peeling and drying the casted film to prepare a light transmitting base material; applying an coating solution containing at least a curable compound, a polymerization initiator, and a solvent onto the light transmitting base material and drying the solvent; and curing the curable compound to form a cured layer, wherein at least one surface of the light transmitting base material has an asperity shape, the light transmitting particles have an average primary particle size greater than 2.5 μ
m but not greater than 12 μ
m,the cured layer has an average thickness of 0.1 μ
m or greater but not greater than 10.0 μ
m, andsurface inclination angles of the cured layer have the following distribution; (a) an integral value of a frequency of 0°
or greater but less than 1.0°
is less than 25%,(b) an integral value of a frequency of 1.0°
or greater but less than 10°
is 60% or greater but less than 100%, and(c) an integral value of a frequency of 10°
or greater is 0% or greater but less than 25%. - View Dependent Claims (4)
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5. A light scattering film comprising:
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a light transmitting base material having a thermoplastic resin as a main component and light transmitting particles having an average primary particle size greater than 2.5 μ
m but not greater than 12 μ
m; anda cured layer having an average thickness of 0.1 μ
m or greater but not greater than 10.0 μ
m,wherein the light transmitting base material has, on a side of the cured layer, a surface shape with a flat portion substantially parallel to a film forming surface and a curved raised portion derived from the light transmitting particles, and a maximum height Rt between the raised portion and the flat portion is 1 μ
m or greater but not greater than 15 μ
m. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification