Hard-coated antiglare film, polarizing plate and image display including the same, and method for producing the same

1. A hard-coated antiglare film, comprising:

a transparent plastic film substrate; and

a hard-coating antiglare layer containing fine particles, being on at least one surface of the transparent plastic film substrate, wherein

the hard-coated antiglare film has a total haze value in a range of 0% to 5%,

a number N total of convexities that exceed a first standard line that is parallel with a roughness mean line of a surface roughness profile and is located at a height of 0.1 μm is at least 15 in a 4-mm long portion at an arbitrary location of the surface of the hard-coating antiglare layer,

when the number of convexities that exceed the first standard line, in which line segments of portions of the mean line that cross the convexities each have a length of 50 μm or longer is indicated by N 50 , N total and N 50 satisfy a relationship expressed by the following formula (1), and

a number of convexities that exceed a second standard line that is parallel with the mean line and is located at a height of 0.2 μm, in which the line segments of portions each have a length of 50 μm or shorter is 10 or less

0.4 ≦N 50 /N total ≦0.8  (1).

2. The hard-coated antiglare film according to claim 1 , wherein

in a measured area, 595 μm×452 μm, at an arbitrary location of the surface of the hard-coating antiglare layer, a number M total of convexities that exceed a standard surface that is parallel with a roughness mean surface of a surface roughness profile and is located at a height of 0.5 μm is in a range of 40 to 150, and

M total and the number M 100 of convexities with a cross-sectional area at the standard surface of 100 μm 2 or more, among the convexities, satisfy a relationship expressed by the following formula (2)

0.15 ≦M 100 /M total ≦0.5  (2).

3. The hard-coated antiglare film according to claim 1 , wherein

the hard-coating antiglare layer is formed using the fine particles and a material for forming a hard-coating layer,

a difference in refractive index between the material for forming a hard-coating layer and the fine particles is in a range of 0.001 to 0.02, and

the hard-coating antiglare layer contains, as the fine particles, at least one type of spherical and amorphous fine particles, each of which have a weight average particle size in a range of 0.5 to 8 μm, and the fine particles in a range of 2 to 15 parts by weight per 100 parts by weight of the material for forming a hard-coating layer.

4. The hard-coated antiglare film according to claim 1 , wherein the hard-coating antiglare layer has a thickness in a range that is 1.6 to 3 times a weight average particle size of the fine particles.

5. The hard-coated antiglare film according to claim 1 , wherein the hard-coating antiglare layer has a thickness in a range of 3 μm or more to less than 7.5 μm.

6. A polarizing plate, comprising:

the hard-coated antiglare film according to claim 1 ; and

a polarizer.

7. An image display, comprising:

the polarizing plate according to claim 6 .

8. An image display, comprising:

the hard-coated antiglare film according to claim 1 .

9. A method for producing the hard-coated antiglare film according to claim 1 , comprising:

providing fine particles, a material for forming a hard-coating layer, and a material for forming a hard-coating antiglare layer, which contain a solvent;

forming a film by applying the material for forming a hard-coating antiglare layer onto at least one surface of the transparent plastic film substrate,

forming a hard-coating antiglare layer by curing the film, wherein

a solvent in which a ratio of an alcohol solvent is 50% by weight or more is used as the solvent.