Optical layered body, method for producing optical layered body, polarizer and image display device

Abstract

The present invention provides an optical layered body which stably keeps light resistance such as ultraviolet resistance and oxidation resistance while keeping conventional physical properties and optical properties as the outermost surface material of an image display device, which is excellent in an antistatic property and which is capable of providing high image contrast when employed for an image display device. The optical layered body has a light transmitting substrate and a resin layer formed on one surface of the light transmitting substrate and is characterized in that the resin layer contains a binder resin, a polythiophene, an auxiliary conductive agent, and a leveling agent.

Claims

1. An optical layered body having a light transmitting substrate and a resin layer formed on one surface of said light transmitting substrate, wherein said resin layer comprises a binder resin, a polythiophene, an auxiliary conductive agent, a leveling agent, and an additive having a protonic functional group which carries out a cross-linking reaction, a rough surface under coat layer is further formed between the light transmitting substrate and the resin layer, the auxiliary conductive agent is carbon nanotubes, the resin layer has an antiglare function, the resin layer having an antiglare function has an uneven surface shape, the uneven shape of the resin layer satisfies the following expression in which the average interval of the projections and recesses of the resin layer surface is expressed as Sm; the average slanting angle of the uneven part is expressed as a; the arithmetic mean roughness of the unevenness is expressed as Ra; and the ten point average roughness of the unevenness is expressed as Rz: 50 m<Sm<600 m 0.1<a<1.50 0.02 m<Ra<0.25 m 0.30 m<Rz<2.00 m; the resin layer is composed of a single layer and has a first region containing no auxiliary conductive agent from the interface on the opposite side to the light transmitting substrate to 100 nm; and the resin layer further comprises: (i) a second region wherein the auxiliary conductive agent exists from the interface of the resin layer on the light transmitting substrate side and a third region wherein the polythiophene exists and being located between the first region and the second region, or (ii) a second region wherein the auxiliary conductive agent exists from the interface of the resin layer on the light transmitting substrate side and a third region wherein the auxiliary conductive agent and polythiophene exist and being located between the first region and the second region.

2. The optical layered body according to claim 1, wherein the content of the polythiophene is 0.1 to 1.0 part by weight relative to 100 parts by weight of the binder resin.

3. The optical layered body according to claim 1, wherein the polythiophene is a complex with an anionic compound.

4. The optical layered body according to claim 1, wherein the auxiliary conductive agent is carbon nanotubes and the content of said auxiliary conductive agent is 0.001 to 0.13 parts by weight relative to 100 parts by weight of the binder resin.

5. The optical layered body according to claim 1, wherein the initial surface resistance value and the surface resistance value after a light resistance test of the resin layer are less than 110.sup.12/.

6. The optical layered body according to claim 1, wherein the additive having a protonic functional group is epoxy acrylate.

7. A polarizer having a polarizing element, wherein said polarizer has the optical layered body according to claim 1, on a surface of said polarizing element.

8. An image display device having the optical layered body according to claim 1 or the polarizer according to claim 7 on an outermost surface.

9. The optical layered body according to claim 2, wherein the polythiophene is a complex with an anionic compound.

10. The optical layered body according to claim 2, wherein the initial surface resistance value and the surface resistance value after a light resistance test of the resin layer are less than 110.sup.12/.

11. The optical layered body according to claim 3, wherein the initial surface resistance value and the surface resistance value after a light resistance test of the resin layer are less than 110.sup.12/.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1: A cross sectional SEM photograph of an optical layered body of the present invention having a resin layer containing chain ATO as an auxiliary conductive agent.

(2) FIG. 2: An explanatory drawing for a method for measuring a.

(3) FIG. 3: A cross sectional drawing schematically showing a resin layer of the optical layered body of the present invention.

(4) FIG. 4: A cross sectional drawing schematically showing a resin layer of the optical layered body of the present invention.

(5) FIG. 5: A cross sectional drawing schematically showing a resin layer of the optical layered body of the present invention.

DESCRIPTION OF EMBODIMENTS

(6) Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples; however, the present invention should not be limited to those examples and comparative examples.

(7) In the description, part(s) and % are on the basis of weight unless otherwise specified.

Example 1

(8) A light transmitting substrate (a triacetyl cellulose resin film with a thickness of 80 m, TD80 UL, manufactured by Fuji Film) was prepared and a resin layer composition having the composition described below was applied to one surface of the light transmitting substrate to form a coating film. Next, the formed coating film was dried in a hot oven at 50 C. for 60 seconds to evaporate the solvent therefrom and hardened by irradiation with ultraviolet rays in the integrated light quantity of 50 mJ/cm.sup.2 to form a resin layer with a thickness of 4 m (after hardening) and thus produce an optical layered body of Example 1.

(9) (Resin Layer Composition)

(10) PEDOT/PSS (organic solvent dispersion type poly(3,4-ethylenedioxythiophene/polystyrenesulfonic acid) (CLEVIOS P; produced by H.C. Starck) 0.5 parts by weight

(11) Chain ATO (V-3560; Chain ATO dispersion (non-volatile matter 20.5%), produced by JGC C&C) 1.2 parts by weight

(12) Urethane acrylate (BS 577, hexa-functional, weight average molecular weight 1000 (containing 60% PETA in solid content), produced by Arakawa Chemical Industries, Ltd.) 50.0 parts by weight

(13) Acrylic ester (M-450, pentaerythritol tetraacrylate (PETTA), produced by Toa Gosei Co., Ltd.) 45.0 parts by weight

(14) Epoxy acrylate (Hitaloid 7851, produced by Hitachi Chemical Co., Ltd.) 5.0 parts by weight

(15) Polymerization initiator (Irgacure 184, produced by Ciba, Japan) 6.0 parts by weight

(16) Polyether-modified silicone oil (TSF 4460, produced by Momentive Performance Materials, Japan) 1.0 part by weight

(17) MIBK 150.0 parts by weight

(18) n-BuOH 100.0 parts by weight

Example 2

(19) An optical layered body of Example 2 was produced in the same manner as in Example 1, except that a resin layer composition prepared by mixing 0.01 parts by weight of carbon nanotubes (VGCF-X, produced by Showa Denko K.K.) was used in place of the chain ATO.

Example 3

(20) An optical layered body of Example 3 was produced in the same manner as in Example 1, except that a resin layer composition prepared by mixing 1.2 parts by weight of ATO (XJB-0014, produced by Pelnox Ltd., non-volatile matter 30.0%) was used in place of the chain ATO.

Example 4

(21) A light transmitting substrate (a triacetyl cellulose resin film with a thickness of 80 m, TD80 UL, manufactured by Fuji Film) was prepared and a resin layer composition having the composition described below was applied to one surface of the light transmitting substrate to form a coating film. Next, the formed coating film was dried in a hot oven at 50 C. for 60 seconds to evaporate the solvent therefrom and hardened by irradiation with ultraviolet rays in the integrated light quantity of 50 mJ/cm.sup.2 to form a resin layer with a thickness of 6 m (after hardening) and having an uneven shape in the surface and thus produce an optical layered body of Example 4.

(22) (Resin Layer Composition)

(23) PEDOT/PSS (organic solvent dispersion type poly(3,4-ethylenedioxythiophene/polystyrenesulfonic acid) (CLEVIOS P; produced by H.C. Starck) 0.5 parts by weight

(24) Chain ATO (V-3560; Chain ATO dispersion (non-volatile matter 20.5%) produced by JGC C&C) 1.2 parts by weight

(25) Urethane acrylate (BS 577, hexa-functional, weight average molecular weight 1000 (containing 60% PETA in solid content), produced by Arakawa Chemical Industries, Ltd.) 50.0 parts by weight

(26) Acrylic ester (M-450, pentaerythritol tetraacrylate (PETTA), produced by Toa Gosei Co., Ltd.) 45.0 parts by weight

(27) Epoxy acrylate (Hitaloid 7851, produced by Hitachi Chemical Co., Ltd.) 5.0 parts by weight

(28) Styrene-acrylic copolymer particles (average particle diameter 3.5 m, refractive index 1.54, produced by Sekisui Plastics Co., Ltd.) 10.0 parts by weight

(29) Polymerization initiator (Irgacure 184, produced by Ciba, Japan) 6.0 parts by weight

(30) Polyether-modified silicone oil (TSF 4460, produced by Momentive Performance Materials, Japan) 1.0 part by weight

(31) MIBK 150.0 parts by weight

(32) n-BuOH 100.0 parts by weight

Examples 5 and 6

(33) Optical layered bodies of Examples 5 and 6 having an uneven shape in the resin layer surface were produced in the same manner as in Example 4, except that the addition amount of PEDOT/PSS, the kind of the auxiliary conductive agent, and the addition amount of the auxiliary conductive agent were changed as shown in the following Table 1.

(34) In kind of auxiliary conductive agent in Table 1, the, Carbon nanotubes is VGCF-X (produced by Showa Denko K.K.) and ATO is XJB-0014 (produced by Pelnox Ltd., non-volatile matter 30.0%).

(35) TABLE-US-00001 TABLE 1 Example 1 2 3 4 5 6 Layer Single Single Single Single Single Single configuration layer (H) layer (H) layer (H) layer (A) layer (A) layer (A) PEDOT/PSS 0.7 0.7 0.7 0.15 0.15 0.15 (parts by mass) Kind of auxiliary Chain CNT ATO Chain CNT ATO conductive agent ATO ATO Auxiliary 1.2 0.01 1.2 1.2 0.01 1.2 conductive agent (parts by mass) Single layer (H): resin layer is formed on light transmitting substrate. Single layer (A): resin layer having antiglare function is formed on light transmitting substrate.

Comparative Example 1

(36) A resin layer was formed in the same manner as in Example 1 and an optical layered body of Comparative Example 1 was produced, except that no PEDOT/PSS was added and the addition amount of the auxiliary conductive agent was changed as shown in the following Table 2.

Examples 7 to 18, Comparative Examples 2 to 4 and 6, and Experimental Examples 1 to 8

(37) A light transmitting substrate (a triacetyl cellulose resin film with a thickness of 80 m, TD80 UL, manufactured by Fuji Film) was prepared and a composition for a rough surface under coat layer having the composition described below was applied to one surface of the light transmitting substrate to form a coating film.

(38) (Composition for Rough Surface Under Coat Layer)

(39) Acrylic-styrene copolymer beads (particle diameter 5 m, refractive index 1.55, produced by Soken Chemical & Engineering Co., Ltd.) 15 parts by weight

(40) Amorphous silica NIPGEL (AZ-204, average particle diameter 1.5 m, produced by Tosoh Silica Co., Ltd.) 5 parts by weight

(41) Pentaerythritol acrylate (PETA, PET-30, produced by Nippon Kayaku Co., Ltd.) 100 parts by weight

(42) Irgacure 184 (produced by Ciba, Japan) 6 parts by weight

(43) Irgacure 907 (produced by Ciba, Japan) 1 part by weight

(44) Polyether-modified silicone (TSF 4460, produced by Momentive Performance Materials, Japan) 0.025 parts by weight

(45) Toluene 150 parts by weight

(46) Cyclohexanone 80 parts by weight

(47) Next, the formed coating film was dried in a hot oven at 50 C. for 60 seconds to evaporate the solvent therefrom and hardened by irradiation with ultraviolet rays in the integrated light quantity of 30 mJ/cm.sup.2 to form a rough surface under coat layer having a portion containing only the resin with a thickness of 3 m (after hardening).

(48) A resin layer was formed in the same manner as in Example 1, except that the addition amount of PEDOT/PSS, the kind of the auxiliary conductive agent, and the addition amount of the auxiliary conductive agent in the resin layer composition were changed as shown in the following Table 2 for formation of an upper layer of the rough surface under coat layer and thus optical layered bodies of respective examples, comparative examples, and experimental examples were produced.

(49) In kind of auxiliary conductive agent in Table 2, CNT is carbon nanotubes (VGCF-X (produced by Showa Denko K.K.)) and ATO is XJB-0014 (produced by Pelnox Ltd., non-volatile matter 30.0%).

Comparative Example 5, and Experimental Examples 9 and 10

(50) A resin layer composition of Comparative Example 5 was prepared in the same manner as in Example 1, except that no leveling agent was added.

(51) A resin layer composition of Experimental Example 9 was prepared in the same manner as in Example 1, except that no epoxy acrylate was added and a resin layer composition of Experimental Example 10 was prepared in the same manner as in Example 1, except that only pentaerythritol triacrylate (PETA, PET-30, produced by Nippon Kayaku Co., Ltd.) was used as a binder resin.

(52) Optical layered bodies of Comparative Example 7, Experimental Example 9, and Experimental Example 10 were produced in the same manner as in Example 12, except that the obtained resin layer compositions were used.

(53) TABLE-US-00002 TABLE 2 Example 7 8 9 10 11 12 13 14 15 16 17 18 Layer Two Two Two Two Two Two Two Two Two Two Two Two configuration layer layer layer layer layer layer layer layer layer layer layer layer PEDOT/PSS 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 (parts by mass) Kind of auxiliary Chain Chain Chain Chain CNT CNT CNT CNT ATO ATO ATO ATO conductive agent ATO ATO ATO ATO Auxiliary 0.6 1.2 2.4 4.8 0.0015 0.01 0.02 0.12 0.6 1.2 2.4 4.8 conductive agent (parts by mass) Comparative Example Example 1 2 3 4 5 6 1 2 3 4 5 6 7 8 9 10 Layer Single Two Two Two Two Two Two Two Two Two Two Two Two Two Two Two configuration layer (A) layer layer layer layer layer layer layer layer layer layer layer layer layer layer layer PEDOT/PSS 0 0 0 0 0.5 0.5 0.05 1.3 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 (parts by mass) Kind of auxiliary Chain Chain CNT ATO CNT None Chain Chain Chain Chain CNT CNT ATO ATO CNT CNT conductive agent ATO ATO ATO ATO ATO ATO Auxiliary 5.2 5.2 0.14 5.2 0.01 0 1.2 1.2 0.4 5.2 0.0005 0.14 0.4 5.2 0.01 0.01 conductive agent (parts by mass) Single layer (H): resin layer is formed on light transmitting substrate. Two layer: rough surface under coat layer and resin layer are formed on light transmitting substrate.

Example 19

(54) A light transmitting substrate (a triacetyl cellulose resin film with a thickness of 80 m, TD80 UL, manufactured by Fuji Film) was prepared and a resin layer composition having the composition described below was applied to one surface of the light transmitting substrate to form a coating film. Next, the formed coating film was dried in a hot oven at 50 C. for 60 seconds to evaporate the solvent therefrom and hardened by irradiation with ultraviolet rays in the integrated light quantity of 50 mJ/cm.sup.2 to form a resin layer with a thickness of 6 m (after hardening) and having an uneven shape in the surface and thus produce an optical layered body of Example 19.

(55) (Resin Layer Composition)

(56) PEDOT/PSS (organic solvent dispersion type poly(3,4-ethylenedioxythiophene/polystyrenesulfonic acid) (CLEVIOS P; produced by H.C. Starck) 0.5 parts by weight

(57) Chain ATO (V-3560; Chain ATO dispersion (non-volatile matter 20.5%) produced by JGC C&C) 1.2 parts by weight

(58) Urethane acrylate (BS 577, hexa-functional, weight average molecular weight 1000 (containing 60% PETA in solid content), produced by Arakawa Chemical Industries, Ltd.) 50.0 parts by weight

(59) Acrylic ester (M-450, pentaerythritol tetraacrylate (PETTA), produced by Toa Gosei Co., Ltd.) 45.0 parts by weight

(60) Epoxy acrylate (Hitaloid 7851, produced by Hitachi Chemical Co., Ltd.) 5.0 parts by weight

(61) Styrene-acrylic copolymer particles (average particle diameter 3.5 m, refractive index 1.54, produced by Sekisui Plastics Co., Ltd.) 10.0 parts by weight

(62) Polymerization initiator (Irgacure 184, produced by Ciba, Japan) 6.0 parts by weight

(63) Polyether-modified silicone oil (TSF 4460, produced by Momentive Performance Materials, Japan) 1.0 part by weight

(64) MIBK 150.0 parts by weight

(65) n-BuOH 100.0 parts by weight

(66) A composition for a low refractive index layer with the following composition was applied to the outermost surface of the obtained resin layer so that the film thickness after drying (40 C.1 min) became 0.1 m. Thereafter, the coating film was hardened by ultraviolet ray irradiation with an irradiation intensity of 100 mJ/cm.sup.2 using an ultraviolet irradiation apparatus (light source H bulb, manufactured by Fusion UV System, Japan) to obtain an optical layered body of Example 19. The film thickness was adjusted in a manner that the minimum value of the reflectance became around a wavelength of 550 nm.

(67) (Composition for Low Refractive Index Layer)

(68) Hollow silica fine particles (solid content of silica fine particles: 20 wt. %, solution; methyl isobutyl ketone, average particle diameter: 50 nm) 73 parts by weight

(69) Fluorine atom-containing polymer (Opstar JN 35, produced by JSR, refractive index 1.41, weight average molecular weight 30000) 1 part by weight on the basis of solid content

(70) Fluorine atom-containing monomer (LINC 3a, produced by Kyoeisha Chemical Co., Ltd., reflective index 1.42) 7 parts by weight

(71) Pentaerythritol acrylate (PETA, PET-30, produced by Nippon Kayaku Co., Ltd.) 2 parts by weight

(72) Polymerization initiator (Irgacure 127, produced by Ciba, Japan) 0.35 parts by weight

(73) Modified silicone oil (X 22164E; produced by Shin-Etsu Chemical Co., Ltd) 0.5 parts by weight

(74) Modified silicone oil (FM 7711; produced by Chisso Corporation) 0.5 parts by weight

(75) MIBK 320 parts by weight

(76) PGMEA 161 parts by weight

Examples 20 and 21

(77) A resin layer was formed in the same manner as in Example 19, except that the type of the auxiliary conductive agent and the addition amount of the auxiliary conductive agent of the resin layer composition were changed as shown in the following Table 3 and a low refractive index layer was formed under the same conditions as in Example 19 on the outermost surface of the resin layer to produce optical layered bodies of Examples 20 and 21.

(78) In kind of auxiliary conductive agent in Table 3, Carbon nanotubes is VGCF-X (produced by Showa Denko K.K.) and ATO is XJB-0014 (produced by Pelnox Ltd., non-volatile matter 30.0%).

Example 22

(79) A light transmitting substrate (a triacetyl cellulose resin film with a thickness of 80 m, TD80 UL, manufactured by Fuji Film) was prepared and a resin layer composition having the composition described below was applied to one surface of the light transmitting substrate to form a coating film. Next, the formed coating film was dried in a hot oven at 50 C. for 60 seconds to evaporate the solvent therefrom and hardened by irradiation with ultraviolet rays in the integrated light quantity of 50 mJ/cm.sup.2 to form a resin layer with a thickness of 4 m (after hardening).

(80) Then, a low refractive index layer was formed under the same conditions as in Example 19 on the outermost surface of the formed resin layer to produce an optical layered body of Example 22.

(81) (Resin Layer Composition)

(82) PEDOT/PSS (organic solvent dispersion type poly(3,4-ethylenedioxythiophene/polystyrenesulfonic acid) (CLEVIOS P; produced by H.C. Starck) 0.5 parts by weight

(83) Chain ATO (V-3560; Chain ATO dispersion (non-volatile matter 20.5%) produced by JGC C&C) 1.2 parts by weight

(84) Urethane acrylate (BS 577, hexa-functional, weight average molecular weight 1000 (containing 60% PETA in solid content), produced by Arakawa Chemical Industries, Ltd.) 50.0 parts by weight

(85) Acrylic ester (M-450, pentaerythritol tetraacrylate (PETTA), produced by Toa Gosei Co., Ltd.) 45.0 parts by weight

(86) Epoxy acrylate (Hitaloid 7851, produced by Hitachi Chemical Co., Ltd.) 5.0 parts by weight

(87) Polymerization initiator (Irgacure 184, produced by Ciba, Japan) 6.0 parts by weight

(88) Polyether-modified silicone oil (TSF 4460, produced by Momentive Performance Materials, Japan) 1.0 part by weight

(89) MIBK 150.0 parts by weight

(90) n-BuOH 100.0 parts by weight

Examples 23 and 24

(91) A resin layer was formed in the same manner as in Example 22, except that the kind of the auxiliary conductive agent and the addition amount of the auxiliary conductive agent of the resin layer composition were changed as shown in the following Table 3 and a low refractive index layer was formed under the same conditions as in Example 19 on the outermost surface of the resin layer to produce optical layered bodies of Examples 23 and 24.

(92) In kind of auxiliary conductive agent in Table 3, Carbon nanotubes is VGCF-X (produced by Showa Denko K.K.) and ATO is XJB-0014 (produced by Pelnox Ltd., non-volatile matter 30.0%).

Example 25

(93) A light transmitting substrate (a triacetyl cellulose resin film with a thickness of 80 m, TD80 UL, manufactured by Fuji Film) was prepared and a composition for a rough surface under coat layer having the composition described below was applied to one surface of the light transmitting substrate to form a coating film.

(94) (Composition for Rough Surface Under Coat Layer)

(95) Acrylic-styrene copolymer beads (particle diameter 5 m, refractive index 1.55, produced by Soken Chemical & Engineering Co., Ltd.) 15 parts by weight

(96) Amorphous silica NIPGEL (AZ-204, average particle diameter 1.5 m, produced by Tosoh Silica Co., Ltd.) 5 parts by weight

(97) Pentaerythritol acrylate (PETA, PET-30, produced by Nippon Kayaku Co., Ltd.) 100 parts by weight

(98) Irgacure 184 (produced by Ciba, Japan) 6 parts by weight

(99) Irgacure 907 (produced by Ciba, Japan) 1 part by weight

(100) Polyether-modified silicone (TSF 4460, produced by Momentive Performance Materials, Japan) 0.025 parts by weight

(101) Toluene 150 parts by weight

(102) Cyclohexanone 80 parts by weight

(103) Next, the formed coating film was dried in a hot oven at 50 C. for 60 seconds to evaporate the solvent therefrom and hardened by irradiation with ultraviolet rays in the integrated light quantity of 30 mJ/cm.sup.2 to form a rough surface under coat layer having a portion containing only the resin with a thickness of 3 m (after hardening).

(104) A resin layer was formed in the same manner as in Example 1, except that the addition amount of PEDOT/PSS, the kind of the auxiliary conductive agent, and the addition amount of the auxiliary conductive agent were changed as shown in the following Table 3 for formation of an upper layer of the rough surface under coat layer.

(105) Then, a low refractive index layer was formed under the same conditions as in Example 19 on the outermost surface of the formed resin layer to produce an optical layered body of Example 25.

Examples 26 and 27

(106) A rough surface under coat layer and a resin layer were formed in the same manner as in Example 25, except that the addition amount of PEDOT/PSS, the kind of auxiliary conductive agents, and the addition amount of the auxiliary conductive agent in the resin layer composition were changed as shown in the following Table 3. Then, a low refractive index layer was formed under the same conditions as in Example 19 on the outermost surface of the formed resin layer to produce optical layered bodies of Examples 26 and 27.

(107) In kind of auxiliary conductive agent in Table 3, Carbon nanotubes is VGCF-X (produced by Showa Denko K.K.) and ATO is XJB-0014 (produced by Pelnox Ltd., non-volatile matter 30.0%).

(108) TABLE-US-00003 TABLE 3 Example 19 20 21 22 23 24 25 26 27 Layer Single layer Single layer Single layer Single layer Single layer Single layer Two Two Two configuration (A) + low (A) + low (A) + low (H) + low (H) + low (H) + low layers + low layers + low layers + low refractive refractive refractive refractive refractive refractive refractive refractive refractive index layer index layer index layer index layer index layer index layer index layer index layer index layer PEDOT/PSS 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 (parts by mass) Kind of auxiliary Chain CNT ATO Chain CNT ATO Chain CNT ATO conductive agent ATO ATO ATO Auxiliary 1.2 0.01 1.2 1.2 0.01 1.2 1.2 0.01 1.2 conductive agent (parts by mass) Single layer (H): resin layer is formed on light transmitting substrate. Single layer (A): resin layer having antiglare function is formed on light transmitting substrate. Two layer: rough surface under coat layer and resin layer are formed on light transmitting substrate.

(109) The obtained optical layered bodies of Examples 1 to 27, Comparative Examples 1 to 6, and Experimental Examples 1 to 10 were subjected to the evaluation of the following items. The evaluation results are shown in Table 4 and Table 5.

(110) (Surface Resistance Value)

(111) Regarding the surface resistance value of the surface of the resin layer of each of the obtained optical layered bodies, the initial surface resistance value immediately after the production was measured by using a surface resistance measurement apparatus (product number: Hiresta IP MCP-HT260, manufactured by Mitsubishi Chemical Corporation). Regarding each of the obtained optical layered bodies, the surface resistance value after 100 hours was measured by using Fade-OMeter (FAL-AU-B, manufactured by Suga Test Instruments Co., Ltd.) for light resistance evaluation.

(112) (Contrast Ratio)

(113) In the contrast ratio measurement, using the one having a diffuser installed in a cold cathode ray tube light source as a back light unit and 2 polarizers (AMN-3244TP, manufactured by Samsung), the contrast (L.sub.1) of the optical layered body (light transmitting substrate+resin layer) and the contrast (L.sub.2) of the light transmitting substrate were measured by dividing the L.sub.max of the luminance of the light passing in the case the polarizers were installed in a parallel Nicol's prism by the L.sub.min of the luminance of the light passing in the case the polarizers were installed in a cross Nicol's prism and the contrast ratio was calculated according to (L.sub.1/L.sub.2)100(%).

(114) For the measurement of the luminance, a color luminance meter (BM-5A, manufactured by Topcon Corporation) was used. The measurement angle of the color luminance meter was set to be 1 and the measurement was carried out in 5 mm visual field on a sample. The light quantity of the back light was set in a manner that the luminance became 3600 cd/m.sub.2 without setting a sample when 2 polarizers were installed in a parallel Nicol's prism.

(115) (Total Light Transmittance)

(116) The total light transmittance of each optical layered body was measured by a method according to JIS K-7361 (total light transmittance) using a haze meter (product number: HM-150, manufactured by Murakami Color Research Laboratory).

(117) (Production Stability)

(118) Each composition prepared in respective examples, comparative examples, and experimental examples was applied in a large size larger than 1 m.sup.2 square; an arbitrary portion of 1 m.sup.2 square in the plane was cut out; the obtained 1 m.sup.2 square sheet was divided into 4 square portions to obtain sheet samples; the initial surface resistance value at an arbitrary position of each sample was measured by the same method as that employed for the above-mentioned evaluation of the surface resistance; and each measured value was used for evaluation according to the following standard.

(119) Excellent: The number of points at which the surface resistance values differed in one digit order was 1 or less.

(120) Good: The number of points at which the surface resistance values differed in one digit order was 2.

(121) Poor: There were points at which the surface resistance values differed in two or more digit order.

(122) (Comprehensive Evaluation)

(123) Regarding the initial surface resistance value, the surface resistance value after the light resistance test, the contrast ratio, and the total light transmittance, the respective evaluations for the comprehensive evaluation were carried out as follows and each optical layered body of respective examples, comparative examples, and experimental examples was comprehensively evaluated as follows.

(124) (Individual Evaluation)

(125) (1) Initial Surface Resistance Value and Surface Resistance Value after Light Resistance Test

(126) Excellent: less than the order of 110.sup.11/

(127) Good: less than the order of 110.sup.12/

(128) Poor: equal to or more than the order of 110.sup.12/

(129) (2) Contrast Ratio

(130) Excellent: equal to or higher than 85%

(131) Good: equal to or higher than 80% and lower than 85%

(132) Poor: lower than 80%

(133) (3) Total Light Transmittance

(134) Excellent: equal to or higher than 89%

(135) Good: equal to or higher than 87% and lower than 89%

(136) Poor: lower than 87%

(137) (Comprehensive Evaluation)

(138) Excellent: All of the individual evaluations and production stability were marked with Excellent

(139) Good: There was at least one marked with Good among the individual evaluations and production stability

(140) Poor: There was at least one marked with Poor among the individual evaluations and production stability

(141) TABLE-US-00004 TABLE 4 Initial surface Total light resistance value Light resistance (100 h) Contrast ratio transmittance Production Comprehensive (/) Surface resistance (/) (%) (%) stability evaluation Example 1 8.00 10.sup.8 9.00 10.sup.8 86 89.2 Excellent Excellent 2 2.00 10.sup.9 4.00 10.sup.9 89 90.0 Excellent Excellent 3 1.00 10.sup.9 3.00 10.sup.9 87 89.8 Excellent Excellent 4 .sup.2.00 10.sup.10 .sup.5.00 10.sup.10 96 91.2 Excellent Excellent 5 .sup.4.00 10.sup.10 .sup.6.00 10.sup.10 97 91.3 Excellent Excellent 6 .sup.1.00 10.sup.10 .sup.4.00 10.sup.10 97 91.1 Excellent Excellent 7 5.00 10.sup.9 6.00 10.sup.9 89 90.7 Excellent Excellent 8 1.00 10.sup.9 2.00 10.sup.9 88 90.4 Excellent Excellent 9 4.00 10.sup.8 8.00 10.sup.8 87 90.2 Excellent Excellent 10 2.00 10.sup.8 6.00 10.sup.8 85 89.5 Excellent Excellent 11 6.00 10.sup.9 .sup.1.00 10.sup.10 91 90.8 Excellent Excellent 12 3.00 10.sup.9 5.00 10.sup.9 90 90.6 Excellent Excellent 13 9.00 10.sup.8 2.00 10.sup.9 89 90.2 Excellent Excellent 14 5.00 10.sup.8 7.00 10.sup.8 87 89.0 Excellent Excellent 15 .sup.3.00 10.sup.10 .sup.4.00 10.sup.10 89 90.6 Excellent Excellent 16 3.00 10.sup.9 5.00 10.sup.9 88 90.3 Excellent Excellent 17 9.00 10.sup.8 3.00 10.sup.9 87 90.1 Excellent Excellent 18 5.00 10.sup.8 6.00 10.sup.8 85 90.0 Excellent Excellent Comparative 1 ND 90.0 Poor Example 2 ND 90.0 Poor 3 ND 91.7 Poor 4 ND 89.9 Poor 5 1.00 10.sup.9 ND 90 90.6 Good Poor 6 ND ND 90 90.6 Poor Poor Example 1 .sup.6.00 10.sup.11 .sup.9.00 10.sup.11 98 91.4 Good Good 2 5.00 10.sup.8 8.00 10.sup.8 81 87.5 Excellent Good 3 .sup.5.00 10.sup.11 .sup.8.00 10.sup.11 91 90.9 Good Good 4 1.00 10.sup.8 5.00 10.sup.8 81 87.7 Excellent Good 5 .sup.3.00 10.sup.11 .sup.7.00 10.sup.11 92 91.0 Good Good 6 4.00 10.sup.8 6.00 10.sup.8 84 88.6 Excellent Good 7 .sup.4.00 10.sup.11 .sup.7.00 10.sup.11 90 90.9 Good Good 8 4.00 10.sup.8 5.00 10.sup.8 80 87.1 Excellent Good 9 .sup.1.00 10.sup.11 .sup.5.00 10.sup.11 90 90.6 Good Good 10 ND 90 90.6 Poor ND indicates that measurement could not be performed or the value was out the range (resistance value was 10.sup.14 / or higher).

(142) TABLE-US-00005 TABLE 5 Initial surface Total light resistance value Light resistance (100 h) Contrast ratio transmittance Production Comprehensive (/) Surface resistance (/) (%) (%) stability evaluation Example 19 6.00 10.sup.9 8.00 10.sup.9 93 93.3 Excellent Excellent 20 8.00 10.sup.9 9.00 10.sup.9 94 93.2 Excellent Excellent 21 7.00 10.sup.9 7.00 10.sup.9 93 93.3 Excellent Excellent 22 5.00 10.sup.9 7.00 10.sup.9 93 94.0 Excellent Excellent 23 7.00 10.sup.9 8.00 10.sup.9 95 94.1 Excellent Excellent 24 6.00 10.sup.9 7.00 10.sup.9 94 94.0 Excellent Excellent 25 7.00 10.sup.9 8.00 10.sup.9 92 93.1 Excellent Excellent 26 8.00 10.sup.9 9.00 10.sup.9 92 93.1 Excellent Excellent 27 7.00 10.sup.9 7.00 10.sup.9 92 93.1 Excellent Excellent

(143) As shown in Tables 4 and 5, the initial surface resistance value, the surface resistance value after the light resistance test, the contrast ratio, and the total light transmittance showed similar tendency regardless of the kinds of the auxiliary conductive agents if the content of the auxiliary conductive agent was around a preferable range.

(144) As shown also in Tables 4 and 5, all the optical layered bodies of examples were found excellent in light resistance and antistatic property and had desired high contrast while maintaining excellent optical properties.

(145) With respect to monolayer ones, bilayer ones, and those having a low refractive index layer formed additionally, no significant difference of effect was observed among them.

(146) The optical layered bodies having an antiglare function of Examples 4 to 21 and 25 to 27, and Experimental Examples 1 to 10 all satisfied the respective requirements for the surface uneveness form, that is, 50 m<Sm<600 m, 0.1<a<1.5, 0.02 m<Ra<0.25 m, and 0.30 m<Rz<2.00 m and had excellent optical properties.

(147) The optical layered bodies of Examples 19 to 27 in which the low refractive index layer was formed were all found to have an extremely low value of the minimum reflectance as low as 0.8 to 1.1% and thus had more excellent optical properties.

(148) On the other hand, the optical layered bodies of Comparative Examples 1 to 4 had a poor initial surface resistance value and were insufficient in the antistatic property, since they contained no polythiophene. Since containing no auxiliary conductive agent, the optical layered body of Comparative Example 6 had a poor initial surface resistance value and a poor surface resistance value after the light resistance test and was insufficient in the antistatic property and inferior in the production stability. The optical layered body of Comparative Example 5, which contained no leveling agent, was insufficient in the surface resistance value after the light resistance test although the initial surface resistance value was better than normal and inferior in the production stability, since the polythiophene unevenly existed near the outermost surface layer of the resin layer and also the auxiliary conductive agent was not arranged in proper positions defined in the present invention. In addition, in all of examples and experimental examples excluding Experimental Example 10, the polythiophene and auxiliary conductive agent were positioned at proper positions defined in the present invention and the initial surface resistance value and surface resistance value after a light resistance test were satisfactory.

(149) The optical layered body of Experimental Example 1, which contained only a small amount of the polythiophene, was poor in the initial surface resistance value and surface resistance value after the light resistance test and was not provided with a sufficient antistatic property. On the other hand, the optical layered body of Experimental Example 2, which contained too large an amount of the polythiophene, was not provided with the desired high contrast. The optical layered bodies of Experimental Examples 3, 5, and 7, which contained only a small amount of the auxiliary conductive agent, were poor in the initial surface resistance value and surface resistance value after the light resistance test and insufficient in the antistatic property. On the other hand, the optical layered bodies of Experimental Examples 4, 6, and 8, which contained a large amount of the auxiliary conductive agent, were not provided with the desired high contrast or desired high total light transmittance. The optical layered body of Experimental Example 9, for which no additive having a protonic functional group (epoxy acrylate) was added, was slightly inferior in the dispersibility and stability of the polythiophene and slightly inferior in the initial surface resistance value and surface resistance value after the light resistance test. The optical layered body of Experimental Example 10, for which only PETA, a highly polar hydrophobic resin, was used as a binder resin, was insufficient in the initial surface resistance.

INDUSTRIAL APPLICABILITY

(150) The optical layered body of the present invention can be used preferably for a cathode ray tube display device (CRT), a liquid crystal display (LCD), a plasma display (PDP), an electroluminescence display (ELD), a field emission display (FED), a touch panel, electronic paper, and the like.