JP4712516B2 - Fine particle-containing composition, ink for forming colored film for display device, light shielding film for display device, light shielding material, substrate with light shielding film, color filter, liquid crystal display element, and liquid crystal display device - Google Patents

Description

  The present invention relates to a fine particle-containing composition suitable for producing a light-shielding film (light-shielding film) provided inside a display device such as a plasma display device, EL display device, or CRT display device, and the fine particle-containing composition. The present invention relates to a colored film forming ink for display device, a light shielding film for display device, a light shielding material, a substrate with a light shielding film, a color filter, a liquid crystal display element, and a liquid crystal display device.

  A light-shielding film for use in a display device has a black edge, a grid around a pixel, a stripe-like black edge (so-called black edge) inside a liquid crystal display device, a plasma display device, an EL display device, a CRT display device, or the like. Matrix), thin film transistors (TFTs), which are provided as dot-like or linear black patterns for light shielding.

For example, a black matrix is an example of a light shielding film that constitutes a liquid crystal display device or the like, and is provided so as to surround each colored pixel (red, green, blue) of a color filter provided inside the liquid crystal display device. This prevents a decrease in contrast due to light leakage between pixels. As another example, in a liquid crystal display element of an active matrix driving system using TFTs, there is a light shielding film provided on the TFTs in order to prevent image quality degradation due to TFT current leakage due to light.
These light-shielding films are generally required to have a light-shielding property having an optical density of 2 or more, and the color tone of the light-shielding film is preferably black from the viewpoint of display quality of the display device.

  In relation to the above, there is a disclosure relating to a method of producing a light shielding film using a dispersion of metal fine particles (see, for example, Patent Document 1). In this method, a widely known dispersant is used for dispersing the metal fine particles.

Moreover, there is an example in which a polymer compound having a thioether group is used together with silver halide grains as a protective colloid for silver halide grains (see, for example, Patent Documents 2 to 4).
JP 2004-334182 A Japanese Patent Laid-Open No. 2-166442 JP-A-4-151140 US Pat. No. 3,615,624

  However, in the above-described method for producing a light-shielding film, the dispersant used for dispersing the metal fine particles is usually widely used, and as a use for the light-shielding film for a display device, the light-shielding performance is satisfactory because the dispersion of the metal fine particles is insufficient. Cannot be obtained.

  In addition, when producing a light-shielding film for use in a display device, it may be exposed to a high temperature in the manufacturing process (for example, post-baking after development), but dispersion of metal fine particles using a conventionally well-known dispersant. In the system, there is a problem that the color of the film is likely to change at a high temperature, and the desired light shielding performance and display contrast cannot be obtained.

  The present invention has been made in view of the above, and a fine particle-containing composition capable of obtaining excellent light-shielding performance with a thin film and suppressing color change when exposed to a high-temperature environment, for forming a colored film for a display device An object of the present invention is to provide ink, a light shielding film for a display device, a light shielding material, a substrate with a light shielding film, a color filter capable of displaying a high-contrast and vivid image, a liquid crystal display element, and a liquid crystal display device. The goal is to achieve this.

  In the present invention, use of a polymer having a thioether structure as a dispersing agent for metal-based fine particles is effective for dispersibility when dispersed, dispersion stability after dispersion, and suppression of color change in a high temperature environment. It has been achieved based on such knowledge. Specific means for achieving the above object are as follows.

  <1> At least metal fine particles and / or metal compound fine particles, a polymer compound having at least one thioether group (hereinafter sometimes referred to as “polymer dispersant according to the present invention”), and heat or light. A fine particle-containing composition comprising a curing compound.

<2> The fine particle-containing composition according to <1>, wherein the polymer compound has a repeating unit derived from an ethylenically unsaturated monomer containing at least one thioether structure in the side chain.
<3> The fine particle-containing composition according to <1> or <2>, wherein the polymer compound has at least a repeating unit represented by the following general formula (1).

In the general formula (1), R ¹ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms in total, R ² represents a hydrogen atom, an alkyl group having 1 to 18 carbon atoms in total, and 6 to 14 carbon atoms in total. An aryl group or an aralkyl group having 7 to 16 carbon atoms in total is represented. Z represents —O— or —NH—, and Y represents a divalent linking group having 1 to 8 carbon atoms in total.

<4> The fine particle-containing composition according to any one of <1> to <3>, wherein the polymer compound further has an acid group.
<5> The fine particle-containing composition according to <4>, wherein the acid group is a carboxylic acid group.
<6> The fine particle-containing composition according to any one of <1> to <5>, wherein the metal fine particles and / or the metal compound fine particles have an aspect ratio of 2 to 100.
<7> The fine particle-containing composition according to any one of <1> to <6>, further including a polyfunctional monomer.
<8> The fine particle-containing composition according to any one of <1> to <7>, further including a photopolymerization initiator.

<9> A colored film forming ink for a display device, comprising the fine particle-containing composition according to any one of <1> to <8>.
<10> A display device comprising the fine particle-containing composition according to any one of <1> to <8> or the colored film forming ink for display device according to <9>. It is a shading film for use.
<11> A light shielding material used for forming a light shielding film for a display device,
On a support, a fine particle-containing layer containing at least metal fine particles and / or metal compound fine particles having an aspect ratio of 2 to 100, a polymer compound having at least one thioether group, and a compound curable by heat or light. It is a light-shielding material having at least one layer.
<12> The light-shielding material according to <11>, further including a polyfunctional monomer.
<13> The light-shielding material according to <11> or <12>, further including a photopolymerization initiator.
<14> The light shielding material according to any one of <11> to <13>, wherein the fine particle-containing layer is a layer that can be transferred to a transfer target.

<15> The fine particle-containing composition according to any one of <1> to <8>, the colored film forming ink for a display device according to <9>, or the <11> to <14>. A substrate with a light-shielding film, comprising a light-shielding film using the light-shielding material according to any one of the above.
<16> On a light-transmitting substrate, a color filter having a pixel group including a plurality of pixels exhibiting different hues and a light-shielding image separating each pixel constituting the pixel group, the light-shielding image is A color filter comprising the light shielding film for a display device according to <10>.
<17> A color filter comprising the light-shielding film-coated substrate according to <15>.
<18> A liquid crystal display device comprising the substrate with a light-shielding film according to <15>.
<19> A liquid crystal display device comprising the liquid crystal display element according to <18>.

  ADVANTAGE OF THE INVENTION According to this invention, the fine particle containing composition by which the outstanding light-shielding performance was obtained with the thin film, and the color change when exposed to high temperature environment was suppressed, the coloring film forming ink for display apparatuses, the light shielding film for display apparatuses In addition, a light shielding material, a substrate with a light shielding film, a color filter capable of displaying a high-contrast and vivid image, a liquid crystal display element, and a liquid crystal display device can be provided.

  Hereinafter, the fine particle-containing composition of the present invention will be described in detail. Through the description, the colored film forming ink for display device, the light shielding film for display device, the light shielding material, the substrate with the light shielding film, the color filter, and the liquid crystal display Details of the element and the liquid crystal display device will also be described in detail.

<Fine particle-containing composition>
The fine particle-containing composition of the present invention contains at least metal fine particles and / or metal compound fine particles, a polymer compound having at least one thioether group, and a compound that is cured by heat or light, and as necessary. It can be configured using other components.

  In the present invention, metal fine particles and / or metal compound fine particles are dispersed and used as a colorant (particularly a black colorant), and the polymer dispersion according to the present invention is used as a dispersant for dispersing the metal fine particles. By using an agent (polymer compound having a thioether group), it contributes to particle behavior such as prevention of aggregation of metal-based fine particles, such as when exposed to high temperatures in the production process, resin components in high-temperature environments, Since the color change accompanying the change of fine particles is suppressed, the dispersibility during dispersion and the dispersion stability after dispersion are improved, and the hue is good and a high optical density can be ensured.

  In the fine particle-containing composition of the present invention, the metal fine particles and / or the metal compound fine particles are preferably dispersed in a polymer compound having a thioether group described later (the polymer dispersant according to the present invention).

-Metal fine particles and / or metal compound fine particles-
The fine particle-containing composition of the present invention contains at least one of metal fine particles and metal compound fine particles as a (particularly black) colorant. By using metallic fine particles as a colorant, a high-density image formability is possible with a thin film, which is particularly effective for forming a black image such as a light-shielded image (including a black matrix).

  In the present invention, the “metal” in the metal fine particles is based on the “metal” (page 352) described in “Iwanami Physical and Chemical Dictionary (5th edition)” (1998, published by Iwanami Shoten). Further, the “metal compound” is a compound of a metal and an element other than the metal, and the metal here is also synonymous with the metal in the metal fine particles.

The metal fine particles are not particularly limited and can be appropriately selected. For example, a metal selected from a metal group included in the fourth period, the fifth period, and the sixth period of the long-period periodic table (IUPAC 1991). Is preferably selected from the group of metals included in Group 2, Group 8, Group 9, Group 10, Group 11, Group 12, Group 13, and Group 14. It is preferable to contain a metal as a main component.
Among these metals, the metal fine particles are metals of the fourth period, the fifth period, or the sixth period, and the metals of Group 2, Group 10, Group 11, Group 12, or Group 14 are Further preferred.

  The shape of the metal fine particles is not particularly limited, and is an amp shape, a potato shape, a rod shape (a needle shape, a cylindrical shape, a rectangular column shape such as a rectangular parallelepiped, a rugby ball shape, etc.), a flat shape (a scale shape, an elliptical plate shape, a plate shape). ), Fibrous, confetti, coiled, etc. Preferred are plate-like particles and rod-like (rod-like) shapes.

  Preferred examples of the fine metal particles include copper, silver, gold, platinum, palladium, nickel, tin, cobalt, rhodium, iridium, iron, ruthenium, osmium, manganese, molybdenum, tungsten, niobium, tantalum, calcium, titanium, and bismuth. And at least one selected from antimony, lead, and alloys thereof. Further, examples of preferable metal fine particles include copper, silver, gold, platinum, palladium, nickel, tin, cobalt, rhodium, iridium, or alloys thereof, and examples of particularly preferable metal fine particles include copper, silver, gold, and the like. And at least one selected from platinum, tin, and alloys thereof.

  Among these, gold, silver, copper, and tin are preferable, and silver is particularly preferable because fine particles can be easily obtained. The metal fine particles in the present invention may be an alloy of the metal, and a preferable alloy is an alloy of silver and tin.

  The number average particle diameter of the metal fine particles is not particularly limited as long as it does not exceed the film thickness, but is preferably in the range of 10 to 1000 nm, more preferably in the range of 10 to 500 nm, and still more preferably in the range of 10 to 200 nm. When the number average particle diameter is within the above range, the production is easy, and when a color filter is produced using metal fine particles within such a range, a black color which is visually good in terms of characteristics (not a brownish hue) A black image portion such as a black matrix can be obtained, and the particle size is not too large, so that the stability of the dispersion after dispersion of the metal fine particles is lowered, and the light shielding property is not deteriorated.

  Here, “particle size” means the diameter when the electron micrograph image of the particle is a circle of the same area, and “number average particle size” is obtained by determining the particle size for a number of particles. The average value of 100 particles having a particle diameter. The particle size distribution is not particularly limited.

  The metal fine particles may have a uniform composition or a non-uniform composition. As an example of a non-uniform composition, there may be mentioned a coating layer having a composition different from the inside on the surface.

  The metal compound fine particles are a compound of a metal and an element other than the metal, and examples thereof include metal oxides, sulfides, sulfates, and carbonates. Of these, sulfides are particularly preferable in terms of color tone and ease of forming fine particles. Specifically, examples of the metal compound include copper oxide (II), iron sulfide, silver sulfide, copper sulfide (II), titanium black, etc., in terms of color tone, ease of fine particle formation, and stability. Silver sulfide is particularly preferred.

  The metal compound fine particles may have a uniform composition or a non-uniform composition. As an example of the non-uniform composition, there can be mentioned a coating layer having a composition different from the inside on the surface.

  The metal fine particles and metal compound fine particles in the present invention are not particularly limited, and can be produced by a known method such as a gas phase method or a liquid phase method. The method for producing metal compound fine particles is described in, for example, “Latest Trends in Technology and Application of Ultrafine Particles II” (Sumibe Techno Research Co., Ltd., issued in 2002).

As the metal fine particles, commercially available ones can be used, and the metal fine particles can be prepared by a chemical reduction method of metal ions, an electroless plating method, a metal evaporation method, or the like.
For rod-shaped silver fine particles, for example, see Adv. Mater. The description of 2002, 14, 80-82 can be referred to, that is, in the presence of a surfactant such as CTAB (cetyltrimethylammonium bromide) after adding further silver salt using spherical silver fine particles as seed particles. Thus, a silver rod or a wire can be obtained by using a reducing agent having a relatively low reducing power such as ascorbic acid. In addition, the same description is described in Mater. Chem. Phys. 2004, 84, 197-204, Adv. Funct. Mater. 2004, 14, 183-189.

Also, Mater. Lett. 2001, 49, 91-95, a method using electrolysis is described in J. Org. Mater. Res. 2004, 19, 469-473 describe a method for producing a silver rod by irradiating microwaves, respectively. In addition, for an example in which reverse micelles and ultrasonic waves are used in combination, J. et al. Phys. Chem. B, 2003, 107, 3679-3683.
As for gold, J. Phys. Chem. B 1999, 103, 3073-3077 and Langmuir 1999, 15, 701-709; Am. Chem. Soc. 2002, 124, 14316-14317.

  Rod-shaped particles can be prepared by a reduction method in the presence of a surfactant. Basically, various rod-shaped particles can be prepared by controlling the type of surfactant, the type of reducing agent, adjusting the amount of addition, and controlling the pH. Specifically, a surfactant that has little interaction with the metal is used first, and at the stage of reduction and particle growth, a surfactant that interacts greatly with the metal is added to suppress further particle growth. . That is, the shape can be controlled by the type and time of the reducing agent.

  The metal compound fine particles can be prepared by oxidizing or sulfurating rod-shaped particles.

  In the present invention, the metal fine particles include composite fine particles of metal and metal, and the metal compound fine particles include composite fine particles of a metal and a metal compound, and composite fine particles of a metal compound and a metal compound.

The shape of the composite fine particles is not particularly limited, and examples thereof include those having different compositions between the inside and the surface of the particles, and those obtained by combining two types of particles. Further, each of the metal compound and the metal constituting the composite fine particle may be one type or two or more types.
Specific examples of the “composite fine particles of metal and metal compound” include composite fine particles of silver and silver sulfide, and composite fine particles of silver and copper (II) oxide.

  In addition to the above, the metal fine particles and metal compound fine particles in the present invention may be composite particles having a core-shell structure. The composite particles having a core / shell structure are those in which the surface of the core material is coated with the shell material. When using composite particles having a core-shell structure, examples of the shell material include Si, Ge, AlSb, InP, Ga, As, GaP, ZnS, ZnSe, ZnTe, CdS, CdSe, CdTe, PbS, PbSe, and PbTe. , Se, Te, CuCl, CuBr, CuI, TlCl, TlBr, TlI and at least one semiconductor selected from these solid solutions or solid solutions containing 90 mol% or more of these, or copper, silver, gold, platinum, palladium, nickel And at least one metal selected from tin, cobalt, rhodium, iridium, iron, ruthenium, osmium, manganese, molybdenum, tungsten, niobium, tantalum, titanium, bismuth, antimony, lead, or alloys thereof. . These shell materials are preferable in that they have a light absorption peak that resonates between quantum levels discretized by the quantum confinement effect in the wavelength range of 300 to 800 nm used.

Among the above, a preferable core material is at least one selected from copper, silver, gold, palladium, nickel, tin, bismuth, ammotin, lead, or an alloy thereof.
The shell material is also preferably used as a refractive index adjusting agent for the purpose of reducing the reflectance.

  As a core material of the composite particles having a core-shell structure, for example, at least one metal selected from copper, silver, gold, palladium, or an alloy thereof can be used.

There is no restriction | limiting in particular in the preparation methods of the composite particle which has a core-shell structure, A typical method is shown below.
(1) A method of forming a metal compound shell on the surface of a metal fine particle produced by a known method by oxidation, sulfurization, or the like. For example, there is a method in which metal fine particles are dispersed in a dispersion medium such as water and sulfides such as sodium sulfide and ammonium sulfide are added. By this method, the particle surface is sulfided to form core-shell composite particles.
In this case, the metal fine particles to be used can be prepared by a known method such as a gas phase method or a liquid phase method. Betechno Research Co., Ltd., published in 2002).
(2) A method of continuously forming a metal compound shell on the surface in the process of producing metal fine particles. For example, by adding a reducing agent to a metal salt solution, reducing part of the metal ions to produce metal fine particles, adding sulfide to this, and forming metal sulfides around the produced metal fine particles Core-shell composite particles are formed.

  Among the fine metal particles and fine metal compound particles described above, fine particles having an aspect ratio (ratio of major axis length / minor axis length) of 2 to 100 can control the absorption spectrum and bring the hue closer to black. It is preferable in that Among these, the aspect ratio is preferably 4 to 80, more preferably 10 to 60, and particularly preferably 15 to 50 in that the absorption spectrum can be controlled and the hue can be made closer to black. When the aspect ratio is within the above range, it is relatively easy to obtain black particles, absorption in the visible light region is good, and image quality (resolution) is not reduced.

  The aspect ratio means a value obtained by dividing a major axis length defined as described later by a minor axis length of a metal fine particle or metal compound fine particle, and a value obtained by measuring 100 metal fine particles and / or metal compound fine particles. Is the average value. The projected area of the particles can be obtained by measuring the area on the electron micrograph and correcting the photographing magnification.

Next, the diameter (major axis length, minor axis length) will be described using metal fine particles as an example.
The particle diameter of the metal fine particles is defined as a triaxial diameter. Then, a box (a rectangular parallelepiped) in which one metal particle just fits exactly is considered, and the length L, width b, height or thickness t of the box is defined as the dimension of the metal particle. There are several ways to store the metal particles in the box. In the present invention, the following method is adopted.
First, the metal particles are placed on a flat surface so that the center of gravity is the lowest and is stable. Next, the metal particles are sandwiched between two parallel flat plates standing at right angles to the plane, and the flat plate interval at the position where the flat plate interval is the shortest is defined as “width b”. Next, metal particles are sandwiched between two parallel flat plates that are perpendicular to the two flat plates that determine the width b and also perpendicular to the flat surface, and the distance between the two flat plates is defined as “length L”. . Finally, the top plate is placed parallel to the plane so as to contact the highest position of the metal particles, and the distance between the top plate and the plane is defined as the height or thickness t. (This method forms a rectangular parallelepiped defined by a plane, two flat plates and a top plate.) Also, the axis corresponding to the longest three-axis diameters b, L, and t of the metal particles is defined as “long axis. ``, The length in the major axis direction is `` major axis length '', and the diameter when the projected area obtained by irradiating metal particles with light parallel to the major axis is converted to a perfect circle is `` minor axis '' Long ”is defined.

  The short axis length of the metal fine particles or metal compound fine particles is preferably within the range of 4 to 50 nm, more preferably within the range of 15 to 50 nm, and most preferably within the range of 15 to 30 nm. The major axis length (maximum length) of the metal fine particles or metal compound fine particles is preferably in the range of 10 to 1000 nm, more preferably in the range of 100 to 1000 nm, and preferably in the range of 400 to 800 nm.

  Metal fine particles and / or metal compound fine particles can control the absorption spectrum by adjusting the aspect ratio (mixing particles of different aspect ratios), that is, by using fine particles of the same metal with different aspect ratios, and controlling the hue. It can also be close to black. In order to approach black, it can also be obtained by combining particles having various aspect ratios such as other metals and metal compound fine particles.

  When the metal fine particles or metal compound fine particles in the present invention are changed from a spherical shape to, for example, a rod shape, the amount of absorption of visible light is also increased by about twice, and the total absorption coefficient is larger than that of spherical particles, and the transmission density is increased. It is possible. Thereby, it is possible to reduce the thickness while maintaining a high concentration.

  The content of the metal fine particles and / or metal compound fine particles in the fine particle-containing composition varies depending on the type and properties of the fine particles, but is preferably 10 to 98% by mass with respect to the total solid content of the composition. 95 mass% is more preferable, and 30-93 mass% is preferable. When the content is within the above range, a high concentration can be obtained with a thin film, and developability is not hindered.

-Polymer compound-
The fine particle-containing composition of the present invention contains at least one polymer compound having at least one thioether group (polymer dispersant according to the present invention) as a dispersant for the metal fine particles and / or metal compound fine particles. . Since the polymer compound having a thioether group is used as a dispersant, when the above-mentioned metal-based fine particles are dispersed and contained, the dispersibility during dispersion and the dispersion stability after dispersion are improved, and the hue (particularly black Phase) is good, and an image having a high optical density can be formed.

  The polymer dispersant according to the present invention can be used by selecting from among polymer compounds having at least one thioether group in the molecule, and particularly preferred are compounds having a thioether group in the side chain portion of the polymer. is there.

  Among these, a polymer compound having a repeating unit derived from an ethylenically unsaturated monomer containing at least one thioether structure in the side chain as the polymer structural unit is preferable, represented by the following general formula (1). A polymer compound having at least one type of repeating unit represented is particularly preferable.

In the general formula (1), R ¹ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
Examples of the alkyl group having 1 to 4 carbon atoms include a methyl group, an ethyl group, a normal propyl group, an isopropyl group, a normal butyl group, a sec butyl group, an isobutyl group, and a tert-butyl group. Groups are preferred.

In the general formula (1), R ² represents a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, an aryl group having 6 to 14 carbon atoms, or an aralkyl group having 7 to 16 carbon atoms. The group, the aryl group, and the aralkyl group may each independently be unsubstituted or substituted, and may form a saturated or unsaturated cyclic structure.

The alkyl group having 1 to 18 carbon atoms represented by R ² may be unsubstituted or substituted, for example, a methyl group, an ethyl group, a normal propyl group, an isopropyl group, a normal butyl group, Examples thereof include alkyl groups such as sec-butyl group, isobutyl group, tert-butyl group, hexyl group, octyl group, dodecyl group and stearyl group. As the substituent in the case of having a substituent, for example, a halogen atom, a hydroxyl group, an amino group, an amide group, a carboxyl group, an ester group, a sulfonyl group and the like are preferable.

  Among the above, an alkyl group having 1 to 12 carbon atoms is preferable, an alkyl group having 1 to 8 carbon atoms is more preferable, and a methyl group, an ethyl group, a normal propyl group, an isopropyl group, a normal butyl group, a tert-butyl group. Is particularly preferred.

The aryl group having 6 to 14 carbon atoms in total represented by R ² may be unsubstituted or substituted, for example, aryl such as phenyl group, toluyl group, xylyl group, naphthyl group, anthracenyl group, etc. Groups. As the substituent in the case of having a substituent, for example, a halogen atom, a hydroxyl group, an amino group, an amide group, a carboxyl group, an ester group, a sulfonyl group and the like are preferable.
Among the above, an aryl group having 6 to 10 carbon atoms is preferable, and a phenyl group is particularly preferable.

The aralkyl group having 7 to 16 carbon atoms represented by R ² may be unsubstituted or substituted, and examples thereof include a benzyl group, a phenethyl group, a naphthylmethyl group, and an anthracenylmethyl group. An aralkyl group is mentioned. As the substituent in the case of having a substituent, for example, a halogen atom, a hydroxyl group, an amino group, an amide group, a carboxyl group, an ester group, a sulfonyl group and the like are preferable.
Among the above, an aralkyl group having 7 to 11 carbon atoms is preferable, and a benzyl group is particularly preferable.

In the general formula (1), Z represents —O— or —NH—. Y represents a divalent linking group having 1 to 8 carbon atoms in total.
The divalent linking group having 1 to 8 carbon atoms represented by Y is, for example, an alkylene group (eg, methylene group, ethylene group, propylene group, butylene group, pentylene group), alkenylene group (eg, ethenylene group, Propenylene group), alkynylene group (eg, ethynylene group, propynylene group), arylene group (eg, phenylene group), divalent heterocyclic group (eg, 6-chloro-1,3,5-triazine-2, 4-diyl group, pyrimidine-2,4-diyl group, quinoxaline-2,3-diyl group, pyridazine-3,6-diyl group), -O-, -CO-, -NR- (R is a hydrogen atom, Represents an alkyl group or an aryl group), or a combination thereof (for example, —NHCH ₂ CH ₂ NH—, —NHCONH—, etc.).

The alkylene group, alkenylene group, alkynylene group, arylene group, divalent heterocyclic group represented by Y, and the alkyl group or aryl group represented by R may have a substituent. Examples of the substituent are the same as those of the aryl group represented by R ² . The alkyl group and aryl group represented by R are synonymous with the alkyl group and aryl group represented by R ² described above.

Of the divalent linking groups having 1 to 8 carbon atoms represented by Y, divalent linking groups having 1 to 6 carbon atoms are preferred, and among them, an ethylene group, a propylene group, a butylene group, a hexylene group,- CH ₂ —CH (OH) —CH ₂ — and —C ₂ H ₄ —O—C ₂ H ₄ — are particularly preferred.

The polymer dispersant according to the present invention may be a polymer compound containing two or more sulfur atoms by copolymerizing not only one type of repeating unit represented by the general formula (1) but also two or more types. Good. In addition, the thioether structure constituting the side chain is not only one sulfur atom but also a side chain having two or more sulfur atoms by constituting Z and R ² with a group having a sulfur atom. Can do.

  The polymer dispersant according to the present invention introduces a thioether structure into a desired polymer compound (preferably as a side chain), or homopolymerization of a monomer having a thioether group (preferably in a side chain), or thioether It can be obtained by copolymerization of a monomer having a group (preferably in the side chain) with another monomer. Preferably, a thioether structure is introduced into the side chain of the ethylenically unsaturated monomer, or homopolymerization of an ethylenically unsaturated monomer containing a thioether structure in the side chain, or an ethylenically unsaturated group containing a thioether structure in the side chain. It can be obtained by copolymerization of a saturated monomer and another copolymer component.

  Specific examples of the repeating unit represented by the general formula (1) are shown below. However, the present invention is not limited to these.

Among the above, in particular, R ¹ is a hydrogen atom or a methyl group, R ² is a methyl group, an ethyl group, a normal propyl group, a normal butyl group, a tert-butyl group, or a phenyl group, and Z is − A compound that is O- and Y is an ethylene group is preferred.

The polymer dispersant according to the present invention may be a copolymer of the repeating unit represented by the general formula (1) and another vinyl monomer.
Other vinyl monomers include aromatic vinyl compounds (eg, styrene, α-methylstyrene, p-hydroxystyrene, chloromethylstyrene, vinyltoluene, etc.), vinyl cyanide (eg, (meth) acrylonitrile, and α- Chloroacrylonitrile, etc.), carboxylic acid vinyl esters (eg, vinyl acetate, vinyl benzoate, vinyl formate, etc.), aliphatic conjugated dienes (eg, 1,3-butadiene, isoprene, etc.), (meth) acrylic acid alkyl esters (eg, Examples such as methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, i-butyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate), (meth) acrylic acid alkylaryl esters ( Example, benzyl (meth) acrylate ), (Meth) acrylic acid substituted alkyl esters (eg, glycidyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, dimethylaminopropyl (meth) acrylate, etc.)), alkyl (meta ) Acrylamide (eg, (meth) acrylamide, dimethyl (meth) acrylamide, N-isopropyl (meth) acrylamide, n-butyl (meth) acrylamide, tert-butyl (meth) acrylamide, and tert-octyl (meth) acrylamide) Substituted alkyl (meth) acrylamides (eg, dimethylaminoethyl (meth) acrylamide, dimethylaminopropyl (meth) acrylamide, etc.), polymerizable oligomers (eg, one-end methacryloylated polymer) Methacrylate oligomer having a methacryloyl group at one end a polystyrene oligomer, and having a methacryloyl group at one end of polyethylene glycol, and the like) are preferably used.

  The polymerization ratio of the repeating unit represented by the general formula (1) in the polymer compound having at least one thioether group (the polymer dispersant according to the present invention) is preferably 1 to 100% in terms of mass fraction. -80% is more preferable, and 10-50% is particularly preferable. When the polymerization ratio is within the above range, it is effective to improve the dispersibility during dispersion and the dispersion stability after dispersion, and to improve the hue and optical density.

  In addition, the polymer dispersant of the present invention is preferably a polymer compound having an acid group in the molecule from the viewpoint that alkali developability can be imparted if necessary. As the acid group, for example, a group such as carboxylic acid group, sulfonic acid, phosphoric acid, boronic acid, phenols, and sulfoamide is preferable, and a polymer compound having at least one carboxylic acid group is particularly preferable.

  When alkali development is required, the polymer dispersant of the present invention preferably has an acid value of 20 to 250 mgKOH / g, more preferably 50 to 200 mgKOH / g, and 70 to 180 mgKOH / g. Most preferably it is. When the acid value is within the above range, the dispersibility during dispersion and the dispersion stability after dispersion are good, and the alkali developability is also good.

  The molecular weight of the polymer dispersant according to the present invention is preferably 2,000 to 1,000,000, more preferably 3,000 to 200,000, and most preferably 5,000 to 100,000 in terms of weight average molecular weight. preferable. When the weight average molecular weight is within the above range, it is effective for improving dispersibility, good film strength can be obtained, and developability is not hindered.

  The content of the polymer compound having at least one thioether group in the fine particle-containing composition is preferably 1 to 40% by mass with respect to the mass of the metal fine particles and / or metal compound fine particles described above, 30 mass% is more preferable, and 5-20 mass% is more preferable. When the content is within the above range, the fine particles are sufficiently adsorbed to improve the dispersibility, and are effective in improving the hue and optical density by suppressing the change in hue due to heat. There is nothing to do.

-Compounds that cure by heat or light-
The fine particle-containing composition of the present invention contains at least one compound that is cured by heat or light.
A polyfunctional monomer or the like can be used as the compound that is cured by heat or light. The polyfunctional monomer is itself polymerized and functions as a binder after polymerization, and the inclusion of the polyfunctional monomer can increase the film strength when a film is formed. The polyfunctional monomer is preferably a photopolymerizable monomer, and more preferably has thermal polymerizability. In the case of thermal polymerization, the degree of curing can be further increased by further heat treatment after photopolymerization.

  Examples of the polyfunctional monomer include compounds having a boiling point of 100 ° C. or higher at normal pressure. For example, ethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, tetramethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, polypropylene glycol di (meth) Acrylate, 1,3-butanediol di (meth) acrylate, trimethylolethane triacrylate, trimethylolpropane tri (meth) acrylate, trimethylolpropane di (meth) acrylate, neopentyl glycol di (meth) acrylate, pentaerythritol tetra (Meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol hexa (meth) acrylate, dipentaerythritol Ruhexa (meth) acrylate, dipentaerythritol penta (meth) acrylate, 1,4-hexanediol (meth) acrylate, hexanediol di (meth) acrylate, trimethylolpropane tri (acryloyloxypropyl) ether, tri (acryloyloxyethyl) ) Isocyanurate, tri (acryloyloxyethyl) cyanurate, glycerin tri (meth) acrylate, trimethylolpropane or glycerin and other polyfunctional alcohols after addition reaction of ethylene oxide or propylene oxide (meth) acrylate, etc. Mention may be made of polyfunctional (meth) acrylates.

  Further, urethane acrylates described in JP-B-48-41708, JP-A-50-6034 and JP-A-51-37193, JP-A-48-64183, JP-B-49-43191, and 52- Polyfunctional acrylates and methacrylates such as polyester acrylates and epoxy acrylates which are reaction products of epoxy resin and (meth) acrylic acid can be mentioned in each publication of No. 30490.

  Among these, it is preferable to use polyfunctional acrylic monomers such as trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, dipentaerythritol penta (meth) acrylate and the like. Two or more types of polyfunctional monomers may be mixed and used in addition to a single type.

  When the polyfunctional monomer is used, the amount of the polyfunctional monomer added in the fine particle-containing composition is not particularly limited, and is generally 5 to 50% by mass with respect to the total solid content of the composition. Yes, 10-40 mass% is preferable. When the addition amount is within the above range, the photosensitivity and the strength of the film constituting the image are good, and the adhesiveness of the film when the film is formed does not become excessive.

  The polyfunctional monomer is a compound that can be polymerized using light or heat, and when the fine particle-containing composition is configured to be photocurable or thermosetting, it is preferable to use a polymerization initiator in combination. More preferably, it is configured to be photocurable by adding an agent. Furthermore, an oligomer may be included in addition to the polyfunctional monomer.

  Examples of the photopolymerization initiator include compounds described in paragraph [0024] of JP-A No. 2004-347831. Furthermore, “polymerization initiator C” described in JP-A-11-133600 can also be mentioned as a preferable example.

  Among the above, as an example of high photosensitivity, less yellowing, and good display characteristics, a trihalomethyloxadiazole photopolymerization initiator and a trihalomethyl-s-triazine photopolymerization Examples include combinations with initiators, among which 2-trichloromethyl-5- (p-styrylmethyl) -1,3,4-oxadiazole and 2,4-bis (trichloromethyl) -6- [4 ′ A combination with-(N, N-bisethoxycarbonylmethylamino) -3'-promophenyl] -s-triazine is most preferred.

  The ratio when combining the photopolymerization initiator as described above (mass ratio of trihalomethyloxadiazole series / trihalomethyl-s-triazine series) is preferably 95/5 to 20/80, and 90/10 -30/70 is more preferred, and most preferred is 80 / 20-40 / 60.

For details of the photopolymerization initiator, reference can be made to the descriptions in JP-A-1-152449, JP-A-1-254918, and JP-A-2-153353.
In addition to the above, examples of suitable photopolymerization initiators include benzophenone photopolymerization initiators.

  As will be described later, a pigment can be used in the fine particle-containing composition of the present invention, and when the proportion of the pigment in the total solid content of the fine particle-containing composition is about 15 to 25% by mass, photopolymerization is performed. A similar effect can be obtained by using a coumarin compound together with the initiator.

  The coumarin compound is most preferably 7- [2- [4- (3-hydroxymethylbiperidino) -6-diethylamino] triazinylamino] -3-phenylcoumarin.

  When the coumarin compound is used, the ratio of the photopolymerization initiator to the coumarin compound (photopolymerization initiator / coumarin compound mass ratio) is preferably 20/80 to 80/20, preferably 30/70 to 70 /. 30 is more preferable, and most preferably 40/60 to 60/40.

  In addition, the photoinitiator which can be used for this invention is not restrict | limited to the above-mentioned polymerization initiator, It can select suitably from other well-known things.

Two or more types of photopolymerization initiators may be mixed and used, and a composition using two or more types is particularly preferable.
When the fine particle-containing composition of the present invention contains a photopolymerization initiator, the addition amount of the photopolymerization initiator in the fine particle-containing composition is 0.1 to 20% by mass relative to the total solid content of the composition. Is generally 0.3 to 15% by mass. When the content is within the above range, it is possible to effectively prevent the photosensitivity and the strength of the film constituting the image from decreasing.

The fine particle-containing composition of the present invention can be suitably configured using a photosensitive resin composition as a compound that is cured by heat or light.
Examples of the photosensitive resin composition include the photosensitive resin composition containing the polyfunctional monomer and / or oligomer described above and a photopolymerization initiator, and paragraphs [0016] to [0022] of JP-A-10-160926. ] And [0029] are preferred. Furthermore, other photopolymerizable monomers may be used in combination.

  Further, when metal fine particles or metal compound fine particles are used as an aqueous dispersion, such as silver colloid, an aqueous one is useful as the photosensitive resin composition. Examples of the aqueous photosensitive resin composition include those described in paragraphs [0015] to [0023] of JP-A No. 8-271727, and commercially available products such as “SPP-” manufactured by Toyo Gosei Co., Ltd. M20 "," SPP-H-13 "and the like.

-Other ingredients-
In addition to the above, the fine particle-containing composition of the present invention is preferably constituted by using other components such as the following known pigments, surfactants, polymers that can be used together, dispersants, dispersion stabilizers and the like as necessary. Can do.

~ Pigment ~
As the pigment, a black pigment such as carbon black can be used.
The addition amount of the pigment is preferably 50% by mass or less, particularly preferably 30% by mass or less, based on the above-described metal fine particles and / or metal compound fine particles. If the added amount of the pigment exceeds 50% by mass, the thickness of the light shielding film necessary for obtaining the required optical density increases, and the quality of red, blue, and green pixels formed on the light shielding film may decrease. is there.

  In addition to black, blue and other pigments may be included for color adjustment. In the case of adding a pigment other than black, the addition amount is preferably 40% by mass or less, more preferably 20% by mass or less, based on the above-described metal fine particles and / or metal compound fine particles. When the added amount exceeds 40% by mass, the color of the film may be deteriorated when the film is formed.

~ Surfactant ~
A surfactant can be added to the fine particle-containing composition of the present invention for the purpose of improving coating properties and dispersion stability of fine particles. As the surfactant, nonionic, anionic and cationic surfactants can be used without particular limitation. Among these, an anionic surfactant is particularly preferable from the viewpoint of liquid stability. Moreover, a fluorine-type surfactant is a preferable surfactant.

As preferable examples of the surfactant, C ₈ F ₁₇ SO ₂ N (C ₂ H ₅ ) (C ₂ H ₄ O) ₁₄ H, C ₈ F ₁₇ SO ₃ Li, C ₇ F ₁₅ COONH ₄ , C ₈ F ₁₇ SO ₂ N (C ₂ H ₅ ) C ₂ H ₄ OPO (OH) ₂ or the like. Furthermore, as a commercial item, F110, F113, F120, F150, F176PF, F177, F780 (all are the Dainippon Ink and Chemicals Co., Ltd. make, oligomer type fluorine-type surfactant) etc. can be mentioned.

~ Polymer that can be used together ~
In the fine particle-containing composition of the present invention, the above-mentioned “having a thioether group” is used as a binder having alkali developability or in order to further improve the dispersion stability of the fine metal particles and / or fine metal compound particles. Polymers other than the “polymer compound” can be used in combination. The type of the polymer is not particularly limited, and the required properties, the components to be copolymerized, the acid value, and the molecular weight are synonymous with the “polymer compound having a thioether group”.

~ Dispersion stabilizer ~
In the fine particle-containing composition of the present invention, a dispersion stabilizer can be used. As the dispersion stabilizer, for example, those described in “Pigment Dispersion Technology” (Technical Information Association, Inc., issued in 1999) can be used. .

--Preparation of fine particle-containing composition--
The fine particle-containing composition of the present invention comprises metal fine particles and / or metal compound fine particles, a polymer compound having a thioether group, a compound curable by heat or light, and other components that can be added as necessary (preferably a solvent). And mixing and dispersing. Preferably, after preparing a fine particle dispersion in which metal fine particles and / or metal compound fine particles are previously dispersed in a solvent together with a polymer compound having a thioether group, a compound that can be cured by heat or light and other components that can be added are added thereto. It can be prepared by adding and mixing.

  The solvent used for the preparation can be used without any particular limitation, and those having an SP value of 9.0 or more are particularly preferable. When the SP value is 9.0 or more, the dispersibility is particularly good, and a sufficient optical density can be achieved even with a thin film.

  The SP value is also referred to as a solubility parameter, and is represented by the square root of the cohesive energy density. In the present invention, page 838 of "Adhesion Handbook" (edited by the Japan Adhesive Society, published by Nikkan Kogyo Shimbun, 1971, first edition). Means the following.

The SP value of the solvent is, for example, n-hexane / 7.3, toluene / 8.9, ethyl acetate / 9.1, methyl ethyl ketone / 9.3, acetone / 10.0, ethyl alcohol / 12.7, methyl alcohol /14.5, water / 23.4, and the like. Here, the unit of the SP value is “(cal / cm ³ ) ^1/2 ”.

  The fine particle-containing composition of the present invention comprises a mixture of metal fine particles and / or metal compound fine particles together with at least a “polymer compound having a thioether group” (and preferably a solvent). It can be prepared by dispersing using a known dispersing machine such as an Eiger mill. Among these, an ultrasonic disperser is preferable.

  The fine particle-containing composition of the present invention is suitable for applications containing dispersed metal fine particles and / or metal compound fine particles, and is preferably a black image (black) of colored film forming ink, light shielding film, and color filter (preferably black). It can be suitably used for applications such as a matrix.

<Ink for forming colored film for display device>
The ink for forming a colored film for a display device of the present invention is prepared using the fine particle-containing composition of the present invention described above. Since it is configured using the fine particle-containing composition of the present invention, it has high stability during long-term storage as an ink, has a good hue (especially a black hue) and a high optical density.

  The ink for forming a colored film for a display device of the present invention comprises metal fine particles and / or metal compound fine particles, a polymer compound having at least one thioether group, and a compound that is cured by heat or light, and may be necessary. Depending on the colorant (preferably a pigment), other components are used, and the ink can be cured by application of heat or application of energy rays such as ultraviolet rays after application of the ink.

  The details of the fine particle-containing composition of the present invention are as described above, and in addition to the above components, components necessary for constituting the ink can be appropriately selected and added.

  The ink for forming a colored film for a display device of the present invention is suitable for use in a display device such as a liquid crystal display device, a plasma display display device, an EL display device, a CRT display device, and the like. It is suitable for forming a grid-like or stripe-like black edge (so-called black matrix) around a pixel, a dot-like or linear black pattern for shielding a thin film transistor (TFT), and the like.

<Light shielding film for display device>
The light shielding film for a display device of the present invention is formed using the fine particle-containing composition of the present invention described above or the color film forming ink for a display device of the present invention described above. Since this light-shielding film is constituted using the fine particle-containing composition of the present invention, such as when exposed to high temperatures in the production process, the color change caused by alteration of resin components and fine particles in a high temperature environment , The hue is good (especially the black hue is good) and the optical density is high.

  The light-shielding film for a display device of the present invention is a method (coating method) in which the thermosetting or photocurable fine particle-containing composition of the present invention is applied to a desired substrate and dried, or on a temporary support. The transfer material having a thermosetting or photocurable light-shielding layer provided by applying and drying the thermosetting or photocurable fine particle-containing composition of the present invention described above to the light shielding It can be produced by using a method (transfer method) or the like of transferring a conductive layer to a desired substrate.

When the light-shielding film for a display device of the present invention is formed into a desired pattern, it is formed by patterning the thermosetting or photo-curable light-shielding layer provided by the above coating method or transfer method. Is done.
Patterning methods include exposure / development, removal of unnecessary parts by laser heat (ablation method), and application of a photosensitive resist film on the light-shielding layer provided on the substrate. -The method of removing the photosensitive resist film after developing and patterning may be mentioned. In the present invention, any of these methods can be used, but the following methods (1) to (3) are preferable in terms of the simplicity of the process and the resolution of patterning.

(1) A non-photosensitive fine particle-containing composition is applied onto a substrate and dried to form a light-shielding layer. A photoresist is applied onto the light-shielding layer, and the formed photoresist film is exposed and developed. A method of dissolving and removing the underlying light shielding layer together with the photoresist film after patterning;
(2) A photosensitive fine particle-containing composition is applied onto a substrate and dried to form a photosensitive light-shielding layer. The formed photosensitive light-shielding layer is exposed and developed (uncured portions are removed). Patterning method;
(3) A photosensitive fine particle-containing composition is applied onto a temporary support and dried to form a photosensitive light-shielding layer in advance to form a laminate (photosensitive transfer material). After laminating on the substrate, the temporary support is removed and the photosensitive light-shielding layer is transferred to the substrate, and then the photosensitive light-shielding layer transferred and formed on the substrate is exposed and developed (uncured portions are removed). Patterning method;

  In any of the above methods (1) to (3), the light-shielding layer can be formed by a simple process compared to the conventional methods using vapor deposition or sputtering, and the light-shielding film is formed in a desired pattern. can do.

~ Step of applying (coating etc.) fine particle-containing composition ~
As a method for applying the fine particle-containing composition to a substrate or a temporary support, a coating method is suitable, and the coating method is not particularly limited. For example, a spin coating method described in JP-A No. 5-224011 A die coating method described in JP-A-9-323472 can be used.

  When applied to the temporary support, as will be described later, it can be a transfer material composed of a temporary support, a light-shielding layer comprising a fine particle-containing composition, and optionally a thermoplastic resin layer and an intermediate layer. .

-Exposure and development process-
The exposure can be performed in a desired pattern using a known light source. The light source may be selected according to the photosensitivity of the photoresist film or the photosensitive light-shielding layer. For example, a known light source such as an ultra-high pressure mercury lamp, a xenon lamp, a carbon arc lamp, or an argon laser can be used. Moreover, you may use together the optical filter etc. which are 2% or less of the light transmittance of the wavelength of 400 nm or more as described in Unexamined-Japanese-Patent No. 6-59119.

  The exposure may be batch exposure in which the entire surface to be exposed is exposed by one exposure, or may be divided exposure in which the surface to be exposed is divided and exposed in multiple times. Furthermore, an exposure method performed while scanning an exposed surface using a laser may be applied.

  Development after exposure can be performed using a developer. As the developer, a dilute aqueous solution of an alkaline substance is suitable, and a solution to which a small amount of an organic solvent miscible with water is added can also be used.

  Examples of the alkaline substance include alkali metal hydroxides (eg, sodium hydroxide, potassium hydroxide), alkali metal carbonates (eg, sodium carbonate, potassium carbonate), alkali metal bicarbonates (eg, sodium bicarbonate, Potassium bicarbonate), alkali metal silicates (eg, sodium silicate, potassium silicate), alkali metal metasilicates (eg, sodium metasilicate, potassium metasilicate), triethanolamine, diethanolamine, monoethanolamine, morpholine Tetraalkylammonium hydroxides (for example, tetramethylammonium hydroxide) or trisodium phosphate are suitable. The concentration of the alkaline substance is preferably 0.01 to 30% by mass, and the pH is preferably 8 to 14. Depending on the properties of the photosensitive light-shielding layer such as oxidation, for example, the pH of the developer can be changed so that development by film-like detachment can be performed.

  Examples of the water-miscible organic solvent include methanol, ethanol, 2-propanol, 1-propanol, butanol, diacetone alcohol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol mono-n-butyl ether, Benzyl alcohol, acetone, methyl ethyl ketone, cyclohexanone, ε-caprolactone, γ-butyrolactone, dimethylformamide, dimethylacetamide, hexamethylphosphoramide, ethyl lactate, methyl lactate, ε-caprolactam, N-methylpyrrolidone and the like are suitable. The concentration of the organic solvent miscible with water is generally 0.1 to 30% by mass.

  A known surfactant can be further added to the developer. The concentration when the surfactant is added is preferably 0.01 to 10% by mass.

The developer may be used as a bath solution or a spray solution. Uncured portions such as a light-sensitive light-shielding layer can also be removed in a solid form (preferably in a film form). In this case, a method such as rubbing with a rotating brush or a wet sponge in a developer, Or the method of utilizing the injection pressure at the time of injecting a developing solution is preferable. The temperature of the developer is usually preferably in the range of about room temperature to 40 ° C.
It is also possible to provide a water washing step after development.

~ Heating and other processes ~
After the development, it is preferable to perform a heat treatment. By the heat treatment, curing of the photosensitive light-shielding layer cured by exposure can be promoted, and the solvent resistance and alkali resistance can be further increased. As a heating method, a method of heating the substrate after development in an electric furnace, a dryer or the like, a method of heating with an infrared lamp, or the like can be applied.

The light-shielding film for a display device of the present invention is preferably a film obtained by performing a heat treatment after development from the viewpoint of increasing the film strength. The heat treatment is preferably performed at 180 to 300 ° C. for 5 to 60 minutes, more preferably at 200 to 270 ° C. for 10 to 50 minutes, and more preferably at 200 to 250 ° C., depending on the composition and thickness of the light shielding film. It is particularly preferred to carry out for ~ 50 minutes.
Further, after the development and before the heat treatment, further exposure may be performed to accelerate the curing, and the exposure in this case can also be performed by the same method as in the exposure described above.

In addition to the above, in the case of forming a photosensitive light-shielding layer, a step of further providing a protective layer on the light-shielding layer may be provided after the light-shielding layer is formed and before exposure to a pattern.
The protective layer functions as an oxygen blocking layer for blocking oxygen during pattern exposure to increase the exposure sensitivity of the photosensitive light blocking layer, and is a layer containing an oxygen blocking resin such as polyvinyl alcohol as a main component. Is preferred. This layer is unnecessary after the formation of the light-shielding film (light-shielded image), and is removed by development.

  The thickness of the light-shielding film for a display device of the present invention is preferably 0.05 to 2.0 μm, more preferably 0.1 to 1.5 μm. When the thickness is within the above range, the necessary optical density is secured and the display contrast is good, and the unevenness of the substrate surface (the difference between the portion where the light shielding film is provided and the portion where the light shielding film is not provided) increases. Thus, there is no inconvenience when forming RGB pixels on this in a later step.

  The transmission density (optical density) of the light-shielding film for display device of the present invention is preferably 3.5 or more, more preferably 4.0 or more, and particularly preferably 4.5 or more. When the optical density is within the above range, high contrast and high display quality can be ensured.

-Board-
As the substrate, a glass substrate generally used in a display device is preferable.
As the glass substrate, for example, a glass substrate using a known glass such as soda glass, low alkali glass or non-alkali glass is suitable. The glass substrate is described, for example, in “Introduction to Liquid Crystal Display Engineering” (Hanae Suzuki, published by Nikkan Kogyo Shimbun (1998)). As other substrates, transparent plastics such as silicon wafers and polyolefins can also be used. Furthermore, a TFT element substrate on which TFT elements are arranged can also be used.

  The thickness of the substrate is preferably in the range of 0.5 to 3 mm, and more preferably in the range of 0.6 to 2 mm.

  The light-shielding film for a display device of the present invention is preferably blacker from the viewpoint of the contrast and visibility of the display image. Being blacker can be evaluated as a color difference from an ideal black target chromaticity when the chromaticity of the light shielding film is expressed by an (x, y) value in the xyz color system. That is, the smaller the color difference value is, the closer it is to an ideal black color, and the farther the color difference is, the farther from black. Specifically, the difference from the target chromaticity when the ideal black target chromaticity (x, y) value is (0.33, 0.33) is expressed as ΔE value of the XY color system. It can be evaluated by expressing.

<Light shielding material>
The light-shielding material of the present invention is a light-shielding material used for forming a light-shielding film for a display device, and has at least one fine particle-containing layer on a support, and further includes a thermoplastic resin layer, an intermediate layer as necessary. A protective film that covers the outermost layer and the outermost layer can be provided.

The fine particle-containing layer according to the present invention includes at least metal fine particles and / or metal compound fine particles having an aspect ratio of 2 to 100, a polymer compound having at least one thioether group, and a compound that is cured by heat or light, It is configured to be thermosetting or photocurable. Moreover, it can comprise using other components, such as a coloring agent (preferably black coloring agent) further as needed.
In the present invention, the compound that is cured by heat or light is preferably a material configured to be photocurable using a polyfunctional monomer and a photopolymerization initiator.

  In the fine particle-containing layer, details of other components such as metal fine particles and / or metal compound fine particles, a polymer compound having a thioether group, a compound curable by heat or light, and a colorant are described in the present invention. This is the same as the case of the fine particle-containing composition, and the preferred embodiment is also the same.

The light-shielding material of the present invention is preferably a transfer material configured such that the fine particle-containing layer provided on the support can be transferred to the transfer target.
Hereinafter, a photosensitive transfer material provided with a photosensitive light-shielding layer will be described in detail as an example. However, the present invention is not limited to this.

  The light-shielding material of the present invention is preferably composed of a photosensitive transfer material suitable for the method (3) mentioned as one of the suitable methods for forming the light-shielding film for a display device described above. This photosensitive transfer material comprises a temporary support and a photosensitive light-shielding property formed by applying the photosensitive fine particle-containing composition of the present invention to the temporary support directly or via another layer and drying. It can consist of layers.

  The layer thickness of the photosensitive light-shielding layer is preferably 0.05 to 2.0 μm, more preferably 0.1 to 1.5 μm. When the thickness is within the above range, the necessary optical density is secured and the display contrast is good, and the unevenness of the substrate surface (the difference between the portion where the light shielding film is provided and the portion where the light shielding film is not provided) increases. Thus, there is no inconvenience when forming RGB pixels on this in a later step.

  In the photosensitive transfer material, a form in which a thermoplastic resin layer is provided between the temporary support and the photosensitive light-shielding layer is preferable, and further, an alkali-soluble property is provided between the thermoplastic resin layer and the photosensitive light-shielding layer. A form in which an intermediate layer is provided is more preferable. A protective film may be provided on the exposed surface of the photosensitive light-shielding layer.

  The temporary support is preferably made of a flexible material that is chemically and thermally stable. Specifically, a thin sheet of Teflon (registered trademark), polyethylene terephthalate, polyethylene naphthalate, polyacrylate, polycarbonate, polyethylene, polypropylene, or a laminate thereof is preferable. Moreover, when providing the below-mentioned thermoplastic resin layer, a thing with favorable peelability from this layer is preferable. As thickness of a temporary support body, 5-300 micrometers is suitable, and 20-150 micrometers is especially preferable.

  When the light-shielding material of the present invention is configured in a form other than the transfer material capable of transferring the fine particle-containing layer, the temporary support can be configured in place of the substrate described above. In this case, a light-shielded image (including a black matrix) having a desired pattern can be formed on the substrate, and the substrate on which the light-shielded image is formed can be used as it is as a substrate constituting the display device. .

-Thermoplastic resin layer-
The thermoplastic resin layer contains at least a resin having thermoplasticity, and can be generally formed using a preparation solution containing a thermoplastic resin prepared using a solvent.

Examples of the resin constituting the thermoplastic resin layer include acrylic resins, polystyrene resins, polyesters, polyurethanes, rubber resins, vinyl acetate resins, polyolefin resins, and copolymers thereof. It is desirable that the resin constituting the thermoplastic resin layer is alkali-soluble.
Moreover, what is described in Paragraph Nos. [0046]-[0048] of Unexamined-Japanese-Patent No. 2004-317897 can be used as resin which comprises a thermoplastic resin layer.

  The thickness of the thermoplastic resin layer is preferably 3 μm or more. When the thickness of the thermoplastic resin is within the above range, it is possible to completely absorb the unevenness of the surface of the transferred material (underlying) of 1 μm or more. The upper limit is preferably about 100 μm or less, more preferably about 50 μm or less, from the viewpoint of the ability to remove alkaline aqueous solution and the suitability for production.

  The thermoplastic resin-containing preparation liquid for forming the thermoplastic resin layer is not particularly limited as long as it can dissolve the resin constituting the layer. For example, methyl ethyl ketone, n-propanol, i-propanol, etc. You can choose.

-Intermediate layer-
In the case of providing the thermoplastic resin layer, an intermediate layer is further provided between the thermoplastic resin layer and the photosensitive light-shielding layer for the purpose of preventing layer mixing of the two layers at the time of applying the preparation liquid or for the purpose of blocking oxygen. Is preferably provided.

  The intermediate layer can be composed of at least a resin, and generally uses a resin-containing preparation prepared by using an aqueous solvent having a low compatibility with a solvent used for forming a thermoplastic resin layer or a photosensitive light-shielding layer. Can be formed.

  The resin constituting the intermediate layer is preferably an alkali-soluble resin, and examples of the resin include those described in paragraph [0050] of JP-A No. 2004-317897.

  The thickness of the intermediate layer is preferably in the range of 0.1 to 5 μm, and more preferably in the range of 0.5 to 3 μm. When the thickness of the intermediate layer is within the above range, the oxygen barrier property is excellent, and the intermediate layer can be removed during development in a short time.

  The fine particle-containing layer constituting the photosensitive transfer material comprises metal fine particles and / or metal compound fine particles having an aspect ratio of 2 to 100 together with a polymer compound having a thioether group and a compound that is cured by heat or light (preferably a solvent). Since the prepared preparation liquid is formed by, for example, coating, etc., it is a thin film and there is little change in the color due to the deterioration of resin components and fine particles in a high-temperature environment, dispersibility during dispersion and after dispersion The dispersion stability is excellent, the hue is good, and the optical density is high.

Next, a method for transferring and forming a fine particle-containing layer on a substrate using a photosensitive transfer material will be mainly described. The transfer is preferably carried out by laminating the surface of the fine particle-containing layer, which is the outermost layer, and the substrate surface in close contact, and peeling and transferring the temporary support.
As the laminating method, a conventionally known laminator, vacuum laminator or the like can be used. An auto-cut laminator can also be used in order to improve friction.

The heating temperature at the time of lamination is preferably about 60 to 150 ° C., and the pressing pressure is preferably about 0.2 to 20 kg / cm ² . In the present invention, the lamination is preferably performed in a range where the line speed of the substrate is about 0.05 to 10 m / min.

  When forming a light-shielding film for a display device using a photosensitive transfer material, after lamination of the photosensitive transfer material and the substrate, the temporary support is peeled off, followed by exposure and development, and further heat treatment after exposure and development. It is preferable to apply. The methods described above can be applied to exposure, development, and heat treatment conditions.

<Substrate with light shielding film>
The substrate with a light shielding film of the present invention uses the fine particle-containing composition of the present invention described above, the ink for forming a colored film for a display device of the present invention described above, or the light shielding material of the present invention described above on the substrate. Thus, a light shielding film is formed.
The light shielding film can be formed by the methods (1) to (3) suitable for forming the light shielding film for a display device described above, and more preferably, the method (3) is used.

  The components constituting the fine particle-containing composition, the colored film forming ink for display device, and the light shielding material are as described above, and the preferred embodiments are also the same. Further, the thickness and transmission density (optical density) of the light shielding film are the same as those in the above-described light shielding film for a display device.

<Color filter>
The color filter of the present invention is described as a pixel group including a plurality of pixels exhibiting different hues on a light-transmitting substrate and a light-shielded image (so-called black matrix) that separates the pixels constituting the pixel group. And a light-shielding film for a display device according to the present invention.

  As the light-transmitting substrate, the above-described substrate, a driving substrate (TFT element substrate or the like) provided with a TFT element or the like can be used.

  The color filter of the present invention is provided with the above-described light shielding film for a display device of the present invention, and the light shielding film for the display device is the fine particle-containing composition of the present invention described above or the display device of the present invention described above. The light-shielding film has a color change that accompanies alteration of resin components and fine particles in a high-temperature environment, such as when exposed to high temperatures during the manufacturing process. Less hue, good hue, high optical density, and excellent display image contrast and wiring shielding.

In the case of using a TFT element substrate, a structure in which a pixel group and a light-shielding film for a display device that separates each pixel constituting the pixel group may be provided on the TFT element substrate.
In addition to the above, the color filter of the present invention may have a configuration in which a TFT element substrate is used, and only a light shielding film (black matrix) for a display device is provided on the TFT element substrate without providing a pixel group. . In this case, a pixel group is formed on a light-transmitting substrate different from the TFT element substrate, and the substrate on which the pixel group is formed is disposed opposite to the TFT element substrate. Thereby, the aperture ratio of the TFT array becomes good.

The pixel group includes a plurality of pixels exhibiting different hues, and can be formed by a conventional method using a plurality of types of colored photosensitive resin compositions and photosensitive transfer materials for forming pixels. Heat treatment is preferably performed after the pixel group is formed.
Regarding the colored photosensitive resin composition and the photosensitive transfer material, for example, JP-A-2005-3861, JP-A-2004-361448, and JP-A-2004-205731 can be referred to.

<Liquid crystal display element, liquid crystal display device>
The liquid crystal display element of the present invention is constructed using the substrate with a light shielding film of the present invention described above. Since the substrate with a light-shielding film of the present invention, specifically, the light-shielding film using the fine particle-containing composition of the present invention, the colored film-forming ink for display device, or the light-shielding material described above, There is little change in color due to exposure, the hue is good, the optical density is high, the contrast of the display image is high, and image display with good display quality is possible.

  A liquid crystal display element will not be specifically limited if it is a liquid crystal display element provided with the board | substrate with a light-shielding film of this invention, It can comprise further using the component of a well-known liquid crystal display element. For example, a color filter substrate, a light-transmitting substrate disposed opposite to the color filter substrate, a liquid crystal layer provided between the substrates, and liquid crystal driving means for driving the liquid crystal in the liquid crystal layer (simple matrix driving method and active matrix driving method) And the above-described color filter of the present invention can be used as a color filter substrate.

  The liquid crystal display device of the present invention is constructed using the liquid crystal display element of the present invention. Since the liquid crystal display element of the present invention, specifically, the substrate with a light-shielding film of the present invention (the fine particle-containing composition of the present invention, the ink for forming a colored film for a display device, or a light-shielding material) described above is used. The color change associated with exposure to a high temperature environment is small, the hue is good, the optical density is high, the contrast of the display image is high, and the image can be displayed with good display quality.

  The liquid crystal display device of the present invention is not particularly limited as long as it is a device manufactured using the liquid crystal display element of the present invention, and can be configured by further using components of a known liquid crystal display device.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the following examples unless it exceeds the gist thereof. Unless otherwise specified, “part” and “%” are based on mass.

<Synthesis of polymer dispersant>
-Synthesis of polymer 1-
After heating 200 parts of normal propanol to 80 ° C., a mixture (monomer solution) of 52.2 parts of ethylthioethyl acrylate, 20.0 parts of methacrylic acid, and 127.8 parts of dimethylacrylamide under a nitrogen stream, 2.70 parts of 2,2′-azobis (isobutyric acid) dimethyl (trade name: V-601, manufactured by Wako Pure Chemical Industries, Ltd.) and 100 parts of normal propanol (initiator solution) for 2 hours each It was dripped simultaneously. After completion of dropping, the mixture is further heated at 80 ° C. for 2 hours under a nitrogen stream, and 500 parts of normal propanol is added to obtain a 20% solution of polymer 1 (weight average molecular weight 84000; polymer dispersant according to the present invention). It was.

-Synthesis of polymer 2-
After heating 200 parts of methyl ethyl ketone to 80 ° C., a mixture (monomer solution) of 52.2 parts of ethylthioethyl acrylate, 47.8 parts of methacrylic acid, and 100.0 parts of styrene under a nitrogen stream, 2'-azobis (isobutyric acid) dimethyl (trade name: V-601; manufactured by Wako Pure Chemical Industries, Ltd.) 1.70 parts and a mixture of 100 parts of methyl ethyl ketone (initiator solution), respectively, over 2 hours It was dripped simultaneously. After completion of dropping, the mixture was further heated at 80 ° C. for 2 hours under a nitrogen stream, and 500 parts of methyl ethyl ketone was added to obtain a 20% solution of polymer 2 (weight average molecular weight 70000; polymer dispersant according to the present invention). .

-Synthesis of polymer 3-
The monomer solution used in the synthesis of the polymer 2 was replaced with a mixture of 47.7 parts of methylthioethyl acrylate, 47.8 parts of methacrylic acid, and 104.5 parts of styrene. A 20% solution of polymer 3 (weight average molecular weight 68000; polymer dispersant according to the present invention) was obtained.

-Synthesis of polymer 4-
The synthesis of the polymer 2 except that the monomer liquid used in the synthesis of the polymer 2 was replaced with a mixture of 67.9 parts phenylthioethyl acrylate, 47.8 parts methacrylic acid, and 84.3 parts methyl methacrylate. In the same manner, a 20% solution of polymer 4 (weight average molecular weight 78000; polymer dispersant according to the present invention) was obtained.

Example 1
<Preparation of silver fine particle composition>
First, Mater. Chem. Phys. In accordance with the method for preparing fine particles described in 2004, 84, p. 197-204, by changing the pH and reaction temperature during silver salt reduction, a dispersion of rod-shaped silver fine particles having various aspect ratios was prepared. The obtained dispersion was centrifuged (rotation speed 10,000 rpm, 20 minutes), and then the supernatant was discarded and concentrated as appropriate to obtain rod-shaped silver fine particles.

  Among the rod-shaped silver fine particles obtained above, 20.0 parts of rod-shaped silver fine particles having an average aspect ratio of 54.7, 20.0 parts of a 20% solution of polymer 1 obtained above, and 80.0 normal propanol Were mixed using an ultrasonic disperser (Ultrasonic generator model US-6000 ccvp, manufactured by Nissei Co., Ltd.) to prepare a silver fine particle composition.

(Evaluation 1)
-1. Evaluation of silver fine particle dispersibility
After the silver fine particle composition was allowed to stand at 25 ° C. for 3 days, the dispersibility of the silver fine particles was visually evaluated according to the following evaluation criteria. The evaluation results are shown in Table 1 below.
<Evaluation criteria>
A: Silver fine particles were uniformly dispersed without settling.
B: Silver fine particles were partially settled.
C: Silver fine particles were completely settled.

<Preparation of shading image forming coating solution>
Each component having the following composition was mixed to prepare a light-shielding image-forming coating solution (fine particle-containing composition for black material).
<Composition of fine particle-containing composition for black material>
-Silver fine particle composition (aspect ratio = 54.7) ... 180 parts · Fluorosurfactant ... 1.68 parts (trade name: F780F, manufactured by Dainippon Ink & Chemicals, Inc.)
-Dipentaerythritol hexaacrylate 6.27 parts (KAYARAD DPHA, manufactured by Nippon Kayaku Co., Ltd.)
-Bis [4- [N- (4,6-bistrichloromethyl-s-triazin-2-yl) phenyl] carbamoyl] phenyl] sebacate ... 0.6 parts Acetone ... 1500 parts

<Formation of shading image>
The alkali-free glass substrate was cleaned with a UV cleaning apparatus, then brush-cleaned with a cleaning agent, and further ultrasonically cleaned with ultrapure water. The cleaned substrate was heat-treated at 120 ° C. for 3 minutes to stabilize the surface state. Subsequently, after cooling the substrate and adjusting the temperature to 23 ° C., a coater for glass substrate having a slit-like nozzle (trade name: MH-1600, manufactured by F.S. Japan Co., Ltd.) was used. A shading image forming coating solution was applied (application step).

  Subsequently, after part of the solvent was dried by a vacuum drying apparatus VCD (manufactured by Tokyo Ohka Kogyo Co., Ltd.) for 30 seconds to eliminate the fluidity of the coating film, the periphery of the substrate was removed by EBR (edge bead remover). Unnecessary coating solution was removed and prebaked at 120 ° C. for 3 minutes to form a light-shielding layer having a layer thickness of 0.5 μm.

Next, a non-alkali glass substrate provided with a mask (quartz exposure mask having a lattice-like image pattern) and a light shielding layer using a proximity type exposure machine (manufactured by Hitachi Electronics Engineering Co., Ltd.) equipped with an ultrahigh pressure mercury lamp. Are set to 100 μm, and pattern exposure is performed with an exposure amount of 200 mJ / cm ² (exposure process).

  Next, after spraying pure from a shower nozzle and uniformly moistening the surface of the light shielding layer, KOH developer CDK-1 (manufactured by FUJIFILM Electronics Materials Co., Ltd .; alkaline development containing KOH and nonionic surfactant) The liquid was diluted 100 times with pure water and sprayed for 80 seconds at 23 ° C. and a nozzle pressure of 0.04 MPa from a flat nozzle to obtain a black pattern (developing step). Subsequently, ultrapure water is sprayed onto the side of the alkali-free glass substrate on which the black pattern is formed at a pressure of 9.8 MPa by an ultra-high pressure cleaning nozzle to remove the residue, and a black (K) image is formed on the alkali-free glass substrate. Formed. Then, this was heat-processed (baked) for 40 minutes at 220 degreeC (baking process), and the light-shielding image was obtained.

<Production of color filter>
Subsequently, an alkali-free glass substrate (hereinafter referred to as “color filter substrate”) on which a light-shielded image is formed is used, and paragraphs [0075] to [0086] of Japanese Patent Application Laid-Open No. 2004-347831 are used for this color filter substrate. In the same manner, a red (R), green (G), and blue (B) colored pattern (colored pixel) having a predetermined size and shape is formed using the photosensitive resin composition described in 1. to produce a color filter. did.

<Production of liquid crystal display element and liquid crystal display device>
Using the color filter obtained above, a liquid crystal display element was produced as shown below, and a liquid crystal display device was further produced.
First, a thin film transistor (TFT) and a pixel electrode were formed on a separately prepared glass substrate so as to correspond to the RGB pattern of the obtained color filter, and an active matrix substrate was prepared by providing an alignment film. . Next, an ITO film and an alignment film were further formed on the color filter obtained above to obtain a counter substrate. The obtained active matrix substrate and the counter electrode are arranged to face each other so as to form a predetermined interval (so-called cell thickness), and TN liquid crystal is sealed between the two substrates and bonded via a sealant to provide a liquid crystal display. An element was obtained. Then, polarizing plates were arranged in crossed Nicols on the surfaces of both substrates of the obtained liquid crystal display element, and a backlight was further arranged on the active matrix substrate side to obtain a liquid crystal display device.

(Example 2)
A silver fine particle composition was prepared in the same manner as in Example 1 except that the 20% solution of polymer 1 was replaced with the 20% solution of polymer 2 and normal propanol was replaced with methyl ethyl ketone. And a shaded image was obtained. The results of Evaluation 1 are shown in Table 1 below. Then, using the obtained light-shielded image, a color filter, a liquid crystal display element, and a liquid crystal display device were produced in the same manner as in Example 1.

(Example 3)
In Example 1, a silver fine particle composition was prepared in the same manner as in Example 1 except that the 20% solution of polymer 1 was replaced with a 20% solution of polymer 3 and normal propanol was replaced with methyl ethyl ketone. Evaluation 1 And a shaded image was obtained. The results of Evaluation 1 are shown in Table 1 below. Then, using the obtained light-shielded image, a color filter, a liquid crystal display element, and a liquid crystal display device were produced in the same manner as in Example 1.

Example 4
In Example 1, a silver fine particle composition was prepared in the same manner as in Example 1 except that the 20% solution of polymer 1 was replaced with a 20% solution of polymer 4 and normal propanol was replaced with methyl ethyl ketone. Evaluation 1 And a shaded image was obtained. The results of Evaluation 1 are shown in Table 1 below. Then, using the obtained light-shielded image, a color filter, a liquid crystal display element, and a liquid crystal display device were produced in the same manner as in Example 1.

(Examples 5 to 8)
In Example 1, the average aspect ratio of the rod-shaped silver fine particles was 54.7 to 3.2 (Example 5), 12.2 (Example 6), 78.4 (Example 7), or 1.3 ( A silver fine particle composition was prepared and evaluated 1 in the same manner as in Example 1 except that each was replaced with Example 8), and a light-shielded image was obtained. The results of Evaluation 1 are shown in Table 1 below. Then, using the obtained light-shielded image, a color filter, a liquid crystal display element, and a liquid crystal display device were produced in the same manner as in Example 1.

Example 9
<Creation of transfer material>
Using a slit-shaped nozzle on the surface of a 75 μm thick polyethylene terephthalate temporary support (PET temporary support), apply a coating solution for a thermoplastic resin layer prepared according to the following formulation H1 so that the dry thickness is 5 μm. It was applied and dried at 100 ° C. for 3 minutes to form a thermoplastic resin layer. On this thermoplastic resin layer, an intermediate layer coating solution prepared by the following formulation P1 was applied using a slit coater so as to have a dry film thickness of 1.5 μm, and dried at 100 ° C. for 3 minutes. A layer (oxygen barrier film) was laminated. On this intermediate layer, the light-shielding image-forming coating solution prepared in Example 1 was applied using a slit coater so as to have a dry film thickness of 0.5 μm, and dried at 100 ° C. for 3 minutes. A layer (metal black layer) was formed.
As described above, a film in which a thermoplastic resin layer, an intermediate layer, and a photosensitive light-shielding layer are sequentially laminated on a PET temporary support is prepared, and a 12 μm-thick polypropylene is further used as a protective film on the light-shielding layer. The film was pressure-bonded to obtain a photosensitive transfer material.

<Prescription H1 of coating solution for thermoplastic resin layer>
-Methanol ... 11.1 parts-Propylene glycol monomethyl ether acetate ... 6.36 parts-Methyl ethyl ketone ... 52.4 parts-Methyl methacrylate / 2-ethylhexyl acrylate / benzyl methacrylate / methacrylic acid copolymer (copolymerization ratio [molar ratio] = 55 / 11.7 / 4.5 / 28.8, weight average molecular weight = 90,000, Tg≈70 ° C.) 5.83 parts styrene / acrylic acid copolymer (copolymerization ratio [molar ratio] = 63) / 37, weight average molecular weight = 10,000, Tg≈100 ° C.) 13.6 parts · 2,2-bis [4- (methacryloxypolyethoxy) phenyl] propane (manufactured by Shin-Nakamura Chemical Co., Ltd .; bisphenol A Compound obtained by dehydration condensation of 2 equivalents of pentaethylene glycol monomethacrylate on 9.1 parts Fluorosurfactant 0.54 parts (quotient) Name: F780F, Dainippon Ink & Chemicals Co., Ltd.)

<Prescription P1 of coating solution for intermediate layer>
PVA-205 32.2 parts (polyvinyl alcohol, manufactured by Kuraray Co., Ltd., saponification degree = 88%, polymerization degree 550)
・ Polyvinylpyrrolidone: 14.9 parts (manufactured by ISP Japan, K-30)
・ Distilled water: 524 parts ・ Methanol: 429 parts

<Production of substrate with shading image by transfer (transfer method)>
A glass cleaner solution is sprayed onto an alkali-free glass substrate for 20 seconds while being washed with a rotating brush having nylon bristles, and after shower washing with pure water, a silane coupling solution (N-β (aminoethyl) γ-aminopropyl) A 0.3% aqueous solution of trimethoxysilane; trade name: KBM603, manufactured by Shin-Etsu Chemical Co., Ltd.) was sprayed for 20 seconds with a shower, and then shower washed with pure water. Further, this substrate was heated at 100 ° C. for 2 minutes using a substrate preheating device.

Subsequently, after peeling off the protective film of the photosensitive transfer material obtained above, the exposed photosensitive light-shielding layer is overlaid so as to be in contact with the surface of the heated glass substrate, and a laminator Lamic II type [Hitachi Industry Co., Ltd. Using a rubber roller temperature of 130 ° C., a linear pressure of 100 N / cm ² , and a conveying speed of 2.2 m / min (lamination). Next, the PET temporary support was peeled off (transfer process).

Subsequently, using a proximity type exposure machine (manufactured by Hitachi Electronics Engineering Co., Ltd.) equipped with an ultrahigh pressure mercury lamp, the mask (quartz exposure mask having an image pattern) and the mask and the thermoplastic resin layer were arranged to face each other. The distance between the mask surface and the surface of the photosensitive resin layer on the side in contact with the intermediate layer is set to 100 μm with the glass substrate standing substantially parallel and vertically, and from the thermoplastic resin layer side through the mask. Pattern exposure was performed at an exposure amount of 70 mJ / cm ² (exposure process).

  After the exposure, a triethanolamine developer T-PD1 (containing 2.5% triethanolamine, nonionic surfactant, and polypropylene antifoaming agent, manufactured by Fuji Photo Film Co., Ltd.) from a flat nozzle at 30 ° C., Shower development was performed by spraying from the top of the thermoplastic resin layer for 50 seconds at a nozzle pressure of 0.04 MPa, and the thermoplastic resin layer and the intermediate layer were developed and removed. Subsequently, pure water was sprayed with a shower nozzle to uniformly wet the surface of the photosensitive light-shielding layer, and then KOH-based developer CDK-1 (manufactured by FUJIFILM Electronics Materials Co., Ltd .; KOH and nonionic surface activity) An agent-containing alkali developer) diluted 100 times with pure water was sprayed for 80 seconds from a flat nozzle at 23 ° C. and a nozzle pressure of 0.04 MPa (development process) to obtain a pattern image. Subsequently, ultrapure water was sprayed at a pressure of 9.8 MPa with an ultrahigh pressure washing nozzle to remove the residue, and a heat treatment (baking process) was performed at 220 ° C. for 40 minutes to obtain a light-shielded image.

(Comparative Example 1)
In Example 1, a silver fine particle composition was prepared in the same manner as in Example 1 except that the polymer 1 was replaced with a benzyl methacrylate / methacrylic acid copolymer (molar ratio = 73/27, weight average molecular weight: 30,000). Preparation and evaluation 1 were performed, and a light-shielded image was obtained. The results of Evaluation 1 are shown in Table 1 below. Then, using the obtained light-shielded image, a color filter, a liquid crystal display element, and a liquid crystal display device were produced in the same manner as in Example 1.

(Evaluation 2)
-2. Hue evaluation
The chromaticity of the light-shielded image obtained in each example and comparative example was measured at a pinhole diameter of 5 μm using a microspectrophotometer OSP100 (manufactured by Olympus Optical Co., Ltd.). The ideal black was set to x = 0.33 and y = 0.33, and a color difference ΔE from the obtained values (x, y values) was calculated as an index for evaluating the hue. The smaller the color difference ΔE, the better the black hue, and the evaluation results are shown in Table 1 below.

-3. Evaluation of transmission density
The transmission density (OD) of the light-shielded image (film) obtained in each Example and Comparative Example was measured using a Macbeth densitometer (TD-904, manufactured by Macbeth Co.). At that time, the optical density of the glass substrate was corrected. The evaluation results are shown in Table 1 below.

As shown in Table 1, in Examples using a polymer compound having a thioether group, the dispersion stability of the metal fine particles was excellent, and the formed light-shielded image had a high transmission density and was subjected to heat treatment. Even after this, the color difference was kept small, and a black image with a good hue could be obtained. In particular, when the film was formed using silver fine particles having an aspect ratio of 2 to 100, the transmission density was high, the color difference after the heat treatment was small, and the hue was excellent.
On the other hand, in Comparative Example 1 in which the polymer compound having a thioether group was not used, the dispersion stability was insufficient, and silver particles were aggregated and a light-shielded image could not be obtained.

(Evaluation 3)
-4. Evaluation of colored pixels
About each color filter obtained in Examples 1-9 and Comparative Example 1, the coloring pattern was evaluated by microscopic observation. As a result, all of the color filters of the examples had no defect in each colored pixel and the pattern was finely formed as compared with the color filter of the comparative example.

(Evaluation 4)
-5. Image quality evaluation
Images were displayed using the liquid crystal display devices obtained in Examples 1 to 9 and Comparative Example 1, and the quality of the displayed images was visually evaluated. As a result, it was confirmed that all of the liquid crystal display devices of the examples were capable of displaying a high-contrast and vivid image and having good display characteristics as compared with the liquid crystal display device of the comparative example.

Claims (19)

  A fine particle-containing composition comprising at least metal fine particles and / or metal compound fine particles, a polymer compound having at least one thioether group, and a compound curable by heat or light.   The fine particle-containing composition according to claim 1, wherein the polymer compound has a repeating unit derived from an ethylenically unsaturated monomer containing at least one thioether structure in the side chain. The fine particle-containing composition according to claim 1 or 2, wherein the polymer compound has at least a repeating unit represented by the following general formula (1).

[Wherein, R ¹ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms in total, and R ² represents a hydrogen atom, an alkyl group having 1 to 18 carbon atoms in total, an aryl group having 6 to 14 carbon atoms in total, or An aralkyl group having 7 to 16 carbon atoms in total is represented. Z represents —O— or —NH—, and Y represents a divalent linking group having 1 to 8 carbon atoms in total. ]   The fine particle-containing composition according to any one of claims 1 to 3, wherein the polymer compound further has an acid group.   The fine particle-containing composition according to claim 4, wherein the acid group is a carboxylic acid group.   The fine particle-containing composition according to any one of claims 1 to 5, wherein the metal fine particles and / or metal compound fine particles have an aspect ratio of 2 to 100.   The fine particle-containing composition according to any one of claims 1 to 6, further comprising a polyfunctional monomer.   The fine particle-containing composition according to any one of claims 1 to 7, further comprising a photopolymerization initiator.   An ink for forming a colored film for a display device, comprising the fine particle-containing composition according to any one of claims 1 to 8.   A light-shielding film for a display device, comprising the fine particle-containing composition according to any one of claims 1 to 8 or the colored film forming ink for a display device according to claim 9. A light shielding material used for forming a light shielding film for a display device,
On a support, a fine particle-containing layer containing at least metal fine particles and / or metal compound fine particles having an aspect ratio of 2 to 100, a polymer compound having at least one thioether group, and a compound curable by heat or light. A light shielding material having at least one layer.   The light-shielding material according to claim 11, further comprising a polyfunctional monomer.   The light-shielding material according to claim 11 or 12, further comprising a photopolymerization initiator.   The light-shielding material according to claim 11, wherein the fine particle-containing layer is a layer that can be transferred to a transfer target.   The fine particle-containing composition according to any one of claims 1 to 8, the ink for forming a colored film for a display device according to claim 9, or the light-shielding material according to any one of claims 11 to 14. A substrate with a light shielding film, characterized by having a light shielding film to be used.   11. A color filter having a pixel group including a plurality of pixels exhibiting different hues on a light-transmitting substrate and a light-shielding image separating each pixel constituting the pixel group, wherein the light-shielded image is the claim 10. A color filter, which is a light-shielding film for a display device described in 1.   A color filter comprising the substrate with a light-shielding film according to claim 15.   A liquid crystal display element comprising the substrate with a light-shielding film according to claim 15.   A liquid crystal display device comprising the liquid crystal display element according to claim 18.