Transparent electroconductive laminate

• US 7,294,395 B2
• Filed: 09/03/2002
• Issued: 11/13/2007
• Est. Priority Date: 09/03/2001
• Status: Expired due to Term

• Current Assignee: Teijin Limited
• Original Assignee: Teijin Limited
• Inventors: Mikoshiba, Hitoshi, Tamura, Yuji, Itoh, Haruhiko
• Primary Examiner(s): Jackson; Monique R.
• Application Number:
  US10/474,638
• Publication Number:
  US 20040151895A1
• Time in Patent Office: 1,897 Days
• Field of Search: 428/323, 428/327, 428/330, 428/331
• US Class Current: 428/327
• CPC Class Codes: B32B 27/06 as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08
• CPC Class Codes: B32B 27/18 characterised by the use of special additives
• CPC Class Codes: G02B 1/116 including electrically conducting layers
• CPC Class Codes: G02B 5/286 having four or fewer layers, e.g. for achieving a colour effect
• CPC Class Codes: G02B 5/287 comprising at least one layer of organic material
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/254 Polymeric or resinous material
• CPC Class Codes: Y10T 428/258 Alkali metal or alkaline earth metal or compound thereof
• CPC Class Codes: Y10T 428/259 Silicic material

Abstract

A transparent electroconductive laminate comprising an organic polymer film having stacked on at least one surface thereof an optical interference layer and a transparent electroconductive layer in this order, the optical interference layer comprising a high refractive-index layer and a low refractive-index layer, with the low refractive-index layer being in contact with the transparent electroconductive layer, and the optical interference layer being composed of a crosslinked polymer, wherein the optical interference layer contains ultrafine particles A comprising a metal oxide and/or a metal fluoride and having a primary diameter of 100 nm or less, and/or at least one of the high refractive-index layer and the low refractive-index layer contains fine particles B having an average primary diameter as large as 1.1 times or more the thickness of the optical interference layer and an average primary diameter of 1.2 μm or less in an amount of 0.5 wt % or less of the crosslinked polymer component. This transparent electroconductive laminate is used as a transparent electrode substrate of a transparent touch panel.

Claims

1. A transparent electroconductive laminate comprising an organic polymer film having stacked thereon a transparent electroconductive layer, wherein:

an optical interference layer and a transparent electroconductive layer are sequentially stacked on at least one surface of the organic polymer film,

the optical interference layer comprises a high refractive-index layer and a low refractive-index layer, with the low refractive-index layer being in contact with the transparent electroconductive layer,

the high refractive-index layer and the low refractive-index layer each is composed of a crosslinked polymer, at least either one of the high refractive-index layer and the low refractive-index layer containing metal oxide and/or metal fluoride ultrafine particles having a primary diameter of 100 nm or less,

the low refractive-index layer has a refractive index of 1.6 or less,

the high refractive-index layer has a larger refractive index than the low refractive-index layer, and

the crosslinked polymer of at least one of the high refractive-index layer and the low refractive-index layer is one formed by hydrolysis and condensation polymerization of a metal alkoxide.

2. The transparent electroconductive laminate as claimed in claim 1, wherein said metal oxide and/or metal fluoride is at least one member selected from the group consisting of Al₂O₃, Bi₂O₃, CeO₂, In₂O₃, In₂O₃, SnO₂, HfO₂, La₂O₃, MgF₂, Sb₂O₅, Sb₂O₅, SnO₂, SiO₂, SnO₂, TiO₂, Y₂O₃, ZnO and ZrO₂.

3. The transparent electroconductive laminate as claimed in claim 1, wherein the weight ratio of said ultrafine particles to said metal alkoxide is from 5:

95 to 80;

20.

4. The transparent electroconductive laminate as claimed in claim 3, wherein said high refractive-index layer is one formed by hydrolysis and condensation polymerization of a mixture comprising said ultrafine particles and alkoxysilane at a weight ratio of 5:

95 to 80;

20.

5. The transparent electroconductive laminate as claimed in claim 1, wherein said high refractive-index layer is one formed by hydrolysis and condensation polymerization of a mixture comprising said ultrafine particles and a metal alkoxide at a weight ratio of 1:

99 to 60;

40 and said metal alkoxide is mainly comprised of a metal alkoxide other than alkoxysilane.

6. The transparent electroconductive laminate as claimed in claim 1, wherein said high refractive-index layer is composed of a mixture comprising said ultrafine particles and said thermosetting resin or radiation-curable resin at a weight ratio of 5:

95 to 80;

20.

7. The transparent electroconductive laminate as claimed in claim 1, wherein said crosslinked polymer of at least one of the high refractive-index layer and the low refractive-index layer is a thermosetting resin or a radiation-curable resin.

8. The transparent electroconductive laminate as claimed in claim 1, wherein the difference in the refractive index between the high refractive-index layer and the low refractive-index layer is 0.2 or more.

9. The transparent electroconductive laminate as claimed in claim 1, wherein at least one of said high refractive-index layer and said low refractive-index layer contains second fine particles having an average primary diameter of 1.1 times or more the thickness of said optical interference layer and an average primary diameter of 1.2 μ

m or less, and the content of said second fine particles is 0.5 wt % or less of the crosslinked polymer component constituting the high refractive-index layer and/or low refractiveindex layer containing said second fine particles.

10. The transparent electroconductive laminate as claimed in claim 1, which comprises a cured resin layer between said organic polymer film and said optical interference layer.

11. The transparent electroconductive laminate as claimed in claim 10, wherein said cured resin layer is composed of a thermosetting or radiation-curable resin and has a thickness of 2 to 5 μ

m.

12. The transparent electro conductive laminate as claimed in claim 10, wherein said cured resin layer contains third fine particles.

13. The transparent electroconductive laminate as claimed in claim 12, wherein said high refractive-index layer is one formed by hydrolysis and condensation polymerization of a mixture comprising said ultrafine particles and a metal alkoxide, said metal alkoxide is mainly comprised of a metal alkoxide other than alkoxysilane, said low refractive-index layer is one formed by hydrolysis and condensation polymerization of alkoxysilane, said ultrafine particle is TiO₂, and said third fine particles are silica particles.

14. The transparent electroconductive laminate as claimed in claim 1, wherein a transparent substrate is stacked on the surface of said organic polymer film opposite said optical interference layer, through a transparent elastic layer having a Young'"'"'s modulus smaller than that of said organic polymer film.

15. A transparent touch panel comprising two transparent electrode substrates each having on at least one surface thereof a transparent electroconductive layer, the two transparent electrode substrates being disposed such that the transparent electroconductive layers face each other, wherein at least one transparent electrode substrate is the transparent electro conductive laminate claimed in claim 1.

16. The transparent touch panel as claimed in claim 15, wherein a movable electrode substrate and a fixed electrode substrate both are said transparent electroconductive laminate.

17. The transparent electroconductive laminate according to claim 1, wherein the transparent electroconductive laminate has a haze of 2.8 or less.

18. A transparent electroconductive laminate comprising an organic polymer film having stacked thereon a transparent electroconductive layer, wherein

an optical interference layer and a transparent electroconductive layer are sequentially stacked on at least one surface of the organic polymer film,

the optical interference layer comprises a high refractive-index layer and a low refractive-index layer, with said low refractive-index layer being in contact with the transparent electroconductive layer,

said optical interference layer is composed of a crosslinked polymer,

at least one of said high refractive-index layer and said low refractive-index layer contains fine particles B having an average primary diameter of 1.1 times or more the thickness of the optical interference layer and an average primary diameter of 1.2 μ

m or less,

the content of said fine particle B is 0.5 wt % or less of the crosslinked polymer constituting the high refractive-index layer and/or low refractive-index layer containing said fine particle B,

the low refractive-index layer has a refractive index of 1.6 or less,

the high refractive-index layer has a larger refractive index than the low refractive-index layer, and

the crosslinked polymer is a polymer formed by hydrolysis and condensation polymerization of a metal alkoxide or is a thermosetting or radiation-curable resin.

19. The transparent electroconductive laminate as claimed in claim 18, wherein at least one of the high refractive-index layer and the low refractive-index layer contains ultrafine particles A having an average primary diameter of 100 nm or less at a weight ratio (ultrafine particle A):

(crosslinked polymer) of 0;

100 to 80;

20.

20. The transparent electroconductive laminate as claimed in claim 19, wherein said high refractive-index layer is composed of a mixture comprising said ultrafine particles A and said thermosetting or radiation-curable resin at a weight ratio of 5:

95 to 80;

20.

21. The transparent electroconductive laminate as claimed in claim 18, which comprises a cured resin layer between said organic polymer film and said optical interference layer.

22. The transparent electroconductive laminate as claimed in claim 21, wherein said cured resin layer is composed of a thermosetting or radiation-curable resin and has a thickness of 2 to 5 μ

m.

23. The transparent electroconductive laminate as claimed in claim 21, wherein said cured resin layer does not contain a fine particle larger than the thickness of said cured resin layer.

24. The transparent electroconductive laminate as claimed in claim 18, wherein said high refractive-index layer is one formed by hydrolysis and condensation polymerization of a mixture comprising said fine particles B and a metal alkoxide, said metal alkoxide is mainly comprised of a metal alkoxide other than alkoxysilane, the low refractive-index layer is one formed by hydrolysis and condensation polymerization of alkoxysilane, and said fine particles B are silica.

25. The transparent electroconductive laminate as claimed in claim 18, wherein a transparent substrate is stacked on the surface of said organic film layer opposite said optical interference layer, through a transparent elastic layer having a Young'"'"'s modulus smaller than that of said organic polymer film.