Transparent electroconductive laminate and transparent touch panel

1. A transparent electroconductive laminate for a transparent touch panel,

wherein the laminate comprises a transparent organic polymer substrate which has, on at least one surface thereof, a cured resin layer, and a transparent electroconductive layer in this order, and

wherein, with respect to the reflection spectrum measured by projecting light having a wavelength of 450 to 700 nm from the transparent electroconductive layer side of the transparent electroconductive laminate, the difference spectrum between the reflection spectrum of the transparent electroconductive laminate and the reflection spectrum obtained when the transparent electroconductive layer is removed from the transparent electroconductive laminate satisfies following conditions (B-a1) and (B-a2):

(B-a1) the maximum absolute value of the difference spectrum is 2.0% or less, and

(B-a2) the integrated value of the difference spectrum is from −150 nm·% to 150 nm·%,

wherein the transparent electroconductive layer is disposed only on a part of the cured resin layer to form a patterned transparent electroconductive layer, and

wherein the cured resin layer has a refractive index of 1.55 or more and 1.628 or less.

2. The transparent electroconductive laminate according to claim 1 ,

wherein the laminate comprises a transparent organic polymer substrate which has, on at least one surface thereof, a hardcoat layer, the cured resin layer, and the transparent electroconductive layer in this order, and

wherein the laminate satisfies the following conditions (A-a) to (A-f):

(A-a) with respect to light having a wavelength of 550 nm, the refractive index n3 of the transparent organic polymer substrate and the refractive index n3h of the hardcoat layer satisfy the following formula:

| n 3 −n 3h |≤0.02

(A-b) the thickness of the hardcoat layer is from 1 to 10 μm,

(A-c) the thickness of the cured resin layer is from 5 to 500 nm,

(A-d) the thickness of the transparent electroconductive layer is from 5 to 200 nm,

(A-e) the total light transmittance is 85% or more, and

(A-f) the chromaticness index b* value of the L*a*b* color system is from −1.0 to less than 1.5.

3. The transparent electroconductive laminate according to claim 2 , wherein the cured resin layer has a refractive index of 1.628.

4. The transparent electroconductive laminate according to claim 1 , wherein following conditions (B-b1) to (B-b3) are further satisfied, assuming that the refractive index of the transparent organic polymer substrate is n 3 , the thickness and refractive index of the cured resin layer are d 2 (nm) and n 2 , respectively, and the thickness and refractive index of the transparent electroconductive layer are d 1 (nm) and n 1 , respectively:

n 1 >n 2 >n 3 ,  (B-b1)

0.44< n 2 /( n 1 +n 3 )<0.49,  (B-b2)

and

245< n 2 d 2 /( n 1 d 1 ) −0.12 <275.  (B-b3)

5. The transparent electroconductive laminate according to claim 1 , wherein the laminate further satisfies following conditions (B-c) to (B-f):

(B-c) the cured resin layer contains a resin component and first ultrafine particles having an average primary particle diameter of 1 to 100 nm,

(B-d) the resin component and the first ultrafine particles contain the same metal and/or metalloid element,

(B-e) in the cured resin layer, the content of the first ultrafine particles is from 0.01 to 3 parts by mass per 100 parts by mass of the resin component, and

(B-f) the thickness of the cured resin layer is from 0.01 to 0.5 μm.

6. The transparent electroconductive laminate according to claim 5 , wherein (B-g) the cured resin layer further contains second ultrafine particles having an average primary particle diameter of 1 to 100 nm and having a refractive index larger than that of the resin component.

7. The transparent electroconductive laminate according to claim 6 , wherein the cured resin layer contains the second ultrafine particles, and thereby the refractive index of the cured resin layer is increased by 0.01 or more, in comparison with the cured resin layer not containing the second ultrafine particles.

8. The transparent electroconductive laminate according to claim 5 , wherein the transparent electroconductive layer has from 10 to 300 protrusions having a height of 30 to 200 nm per 50 μm square.

9. The transparent electroconductive laminate according to claim 5 , wherein the surface roughness Ra of the transparent electroconductive layer is 20 nm or less.

10. The transparent electroconductive laminate according to claim 5 , wherein the metal and/or metalloid element is/are one or more elements selected from the group consisting of Al, Bi, Ca, Hf, In, Mg, Sb, Si, Sn, Ti, Y, Zn and Zr.

11. The transparent electroconductive laminate according to claim 5 , wherein an adhesive layer is provided between the transparent electroconductive layer and the cured resin layer, and wherein all of the adhesive layer, the resin component of the cured resin layer, and the ultrafine particles of the cured resin layer contain the same metal and/or metalloid element.

12. The transparent electroconductive laminate according to claim 1 , wherein the laminate has the total light transmittance of 85% or more and a haze of 2% or less.

13. The transparent electroconductive laminate according to claim 1 , wherein the laminate comprises an additional cured resin layer between the transparent organic polymer substrate and the cured resin layer.

14. The transparent electroconductive laminate according to claim 13 , wherein the additional cured resin layer has the surface roughness Ra of from 20 nm to less than 500 nm.

15. A capacitance-type transparent touch panel, comprising at least one transparent electrode substrate each having a transparent electroconductive layer on at least one surface thereof, wherein the transparent electroconductive laminate according to claim 1 is used as at least one transparent electrode substrate.

16. The transparent touch panel according to claim 15 , wherein, on the observation side of the transparent touch panel, a polarizing plate is stacked on the transparent electroconductive laminate directly or through another substrate.

17. A resistant film-type transparent touch panel, comprising two transparent electrode substrates each having a transparent electroconductive layer on at least one surface thereof, and disposed by arranging respective transparent electroconductive layers to face each other, wherein the transparent electroconductive laminate according to claim 1 is used as at least one of the transparent electrode substrates.

18. The transparent electroconductive laminate according to claim 1 , wherein the laminate comprises a transparent organic polymer substrate which has, on at least one surface thereof, a cured resin layer directly formed on the transparent organic polymer substrate, and a transparent electroconductive layer directly formed on the cured resin layer, wherein the transparent organic polymer substrate is a polycarbonate transparent organic polymer substrate.

19. The transparent electroconductive laminate according to claim 1 , wherein the laminate consists of a transparent organic polymer substrate which has, on at least one surface thereof, a cured resin layer, and a transparent electroconductive layer in this order, wherein the transparent organic polymer substrate is a polycarbonate transparent organic polymer substrate.

20. The transparent electroconductive laminate according to claim 1 , wherein the laminate consists of a transparent organic polymer substrate which has, on only one surface thereof, a cured resin layer, and a transparent electroconductive layer in this order, wherein the transparent organic polymer substrate is a polycarbonate transparent organic polymer substrate.

21. The transparent electroconductive laminate according to claim 1 , wherein the cured resin layer has a refractive index of 1.60 or more and 1.628 or less.