JPH0814665B2 - Method for producing multicolor surface coloring body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a multicolor display device used for a personal computer image display device, a television, a video display device, a display panel of a measuring instrument, an instrument panel of an automobile, and the like. The present invention relates to a method for producing a multicolor surface coloring body used for colorization or the like.

[Outline of Invention]

The present invention relates to a method for producing a multicolored surface colored body such as a color filter used for color display of a television, etc., by manufacturing a colored body composed of a polymer and a dye by an electrodeposition method. Among them, the present invention relates to a production method for facilitating the production of a multicolor surface colored body and improving the quality thereof by coating an insulating film which can be easily peeled off.

[Conventional technology]

A conventional method for producing a multicolor surface coloring body will be described with reference to FIGS. 3 and 2. 1 in FIG. 3 is a glass substrate, 2a, 2
b, 2c, 2a ', 2b', 2c '... are a plurality of conductive layers formed on the surface of the glass substrate, which are generally indium oxide, tin oxide or a mixture thereof, but also a metal such as nickel or chromium. It is formed of a simple substance or a composite layer of the indium oxide, tin oxide or a mixture thereof. This conductive layer is formed on the glass substrate 1 in a desired pattern, and a terminal portion dedicated to electrodeposition is provided to energize the conductive layer in the case of coloring by the electrodeposition method. 11,12,13 in Fig. 3
Is a conductive layer provided as a terminal for exclusive use of electrodeposition of the first color, and similarly 21, 22, 23 is a second color 31, 32, 33 is a third color. Power feeding material 3 for feeding power to the conductive layer of the terminal portion dedicated to electrodeposition
In general, a copper tape or the like, which is a composite material of a conductive adhesive layer and a copper foil, is used. The copper tape is bonded by thermocompression bonding to the electrodeposition-dedicated terminal portion of the conductive layer to be electrodeposited. First of all, when electrodepositing the first color, the glass substrate 1
The electric power feeding material 3 is bonded by a thermocompression bonding method across the entire common color terminals of the electrodeposition exclusive terminals 11, 12, 13, ... Formed on the surface of the. The glass substrate 1 to which the power feeding material is added is immersed in an electrodeposition bath, and electricity is supplied through the power feeding material 3, whereby all the conductive layers 2a, 2a '... ... The polymer resin and dye in the electrodeposition bath are attracted to the surface by electrophoresis, and the conductive layers 2a, 2
a '... A colored layer is formed as shown in FIG. 2 (a) 2a by precipitation polymerization by an electrochemical reaction on the surface.

Next, after peeling off the power feeding material 3 adhered to the conductive layers 2a, 2a '... of the first color, the conductive layers 2b, 2b' are similarly removed.
The electrode 21, which is the electrodeposition only for the electrode, is transversely joined by thermocompression bonding to perform electrodeposition for the second color, and as shown in FIG. A colored layer of a color is formed.
The third color is performed in the same manner.

Here, the polymer electrodeposition method will be briefly described. As a method of electrodepositing a polymer on an electrode, a pigment is dispersed in an aqueous polymer solution, and a conductor is used as an electrode to immerse and energize in an electrodeposition bath to deposit the pigment together with the polymer to obtain a colored layer. In principle, this method uses a polymer in which a hydrophilic group, for example, a carboxyl group is introduced, and the carboxyl group is neutralized with an inorganic alkali, an organic amine or the like and solubilized. Immerse the electrode in this water-solubilized polymer solution,
When a voltage is applied, the carboxy anion dissociated in the aqueous solution is electrophoresed toward the anode, and reacts with the proton generated by the electrolysis of water on the electrode to insolubilize and precipitate the polymer. That is, the reaction represented by the following formula occurs on the anode, and precipitation of the polymer is observed.

^{_{2H 2 O → 4H + + O}} 2 ↑ + 4e - When the electrodeposited polymer is electrically insulative, the electrode is coated with the polymer and the current decreases, and it is considered that an increase in film thickness cannot be expected because it prevents further coating,
Actually, the initial complete coating is avoided due to the bubbles of oxygen generated by the electrolysis of water, and a certain thickness can be obtained before the insulating layer is formed. Further, the polymer film containing the obtained dye (pigment) has a small water content due to the effect of electroosmosis and becomes a uniform film with good adhesion.

The steps for forming the plurality of colored layers are roughly as follows. Adhesion of power supply material to glass substrate → electrodeposition → cleaning / peeling of power supply material → thermosetting → repetition of following [Problems to be solved by the invention] Multicolor surface by polymer electrodeposition method as described above In the method for producing a colored body, a colored film is also formed on the conductive layer portion of the electrodeposition terminal provided on the body to be colored, and as shown in FIG. 2 (c) at the time of electrodeposition of the second and subsequent colors. , The conductive layer 2a, 2a ', 2c' of the electrodeposited terminal of the first color ... The power feeding material 3 used for the electrodeposition of the second color and thereafter due to the thickness of the colored film on it.
However, there is an unavoidable problem that unevenness occurs due to the inability to adhere in the same plane. Therefore, the power supply material used for the second and subsequent colors and the conductive layers 2b, 2 of the electrodeposited terminals for the second and subsequent colors.
Adhesion with b ′, 2b ″ ... or 2c, 2c ′, 2c ″ ... becomes insufficient, resulting in an increase in contact resistance, causing a problem in that the thickness of the colored film due to the conductive layer varies. Further, the variation in the thickness of the colored film remarkably deteriorates the quality of the multicolored surface coloring material, resulting in defective products, which is an industrial and economical problem of lowering the yield.

Further, when it is not desired to electrodeposit on a specific portion, for example, when a multicolor surface coloring body is used as a multicolor display device as shown in FIG. 6, a seal portion 9 with a counter substrate and a mounting electrode terminal portion 8 are used.
It is necessary to remove the colored layer on the top. The former is to enhance the sealing property, and the latter is to remove the colored layer which is an insulating film to establish electrical connection. In this case, conventionally, a method of mechanically scraping off the colored layer after forming the colored layer by electrodeposition or wiping with an organic solvent such as acetone has been used.
Since the colored layer formed by electrodeposition is strong and has high chemical resistance, it is difficult to completely remove the colored layer.

[Means for solving problems]

In the electrodeposition method, since the electrodeposition film is formed only on the conductive layer portion, the above problems can be solved by coating the insulating film on a specific conductive layer and peeling off the insulating film after electrodeposition. I was able to.

[Operation] That is, as to the first problem, as shown in FIG. 1, the surface of the conductive layer for exclusive use of the electrodeposition is previously covered with the insulating film 4 at the time of electrodeposition of the first color, and peeled before the electrodeposition of the second color. By doing so, the power supply material for the second color electrodeposition could be uniformly adhered, and the variation in the thickness of the colored layer could be solved.

As for the second problem, it is possible to form a portion having no colored layer at a predetermined position by coating the insulating film on the portion where the colored layer is to be removed in advance and peeling off the insulating film after electrodeposition. It was

Example 1 A synthetic rubber-based peelable surface protective coating (rubber coat manufactured by Daikyo Kagaku Co., Ltd.) was used as an insulating film material, and among the conductive layers patterned on a glass substrate as shown in FIG.
It was applied by screen printing on the second and third color electrodeposited terminal portions. This synthetic rubber-based peelable surface protection paint was a mixture of paint and thinner at a ratio of 1: 1 using a dedicated thinner, and was cured under a dry condition of 120 ° C for 5 minutes to form an insulating film. After providing this insulating film 3, a 6 mm wide copper tape (manufactured by Sony Chemical) was used as the power supply material.
Adhesion was performed by thermocompression bonding so as to traverse the colored electrode-dedicated terminals 11, 12, 13 ... This power feeding material 3 was connected to an anode as a lead for electrodeposition, and was immersed and electrodeposited in an electrodeposition tank. After the washing and drying process, the power supply material 3 is peeled off, the insulating film 4 is separated by a cutter between the second and third color electrode-deposited terminals, and the second color electrode-dedicated terminals 21, 22, 23 ...... Only the upper insulating film was peeled off. Thereafter, similarly, as shown in FIG. 4 (b), the power feeding material 3 was adhered to the second-color electrodeposited terminal. Fig. 4 (c)
Shows the state in which the power feeding material 3 is bonded to the glass substrate 1 at that time. After that, the second color was electrodeposited, followed by washing with water, drying, and the third color by the same method as described above. The width of the insulating film covering the electrode for exclusive use of the third color was widened so as to include the application portion of the sealing material and the electrode terminal portion at the time of manufacturing the liquid crystal panel.

The multicolor surface coloring body produced by this method had a uniform color tone over the entire surface of the conductive layer formed on the upper surface of the glass substrate 1, and the coloring film had a uniform thickness.

Further, when a multicolor display device was manufactured as shown in FIG. 6 using this multicolor surface coloring material, the sealing property was improved, and the electrical connectivity at the time of mounting the electrode terminals was not affected at all.

[Example 2] A vinyl chloride-based coating material (CFC sol manufactured by NIPPON KENBOSHI CO., LTD.) Was used as an insulating film material, and as shown in FIG. Was provided and coating was performed with a dispenser. As the drying condition, curing was performed at 150 ° C. for 10 minutes. After that, the first color electrode-dedicated terminals 11, 12, 13 ... are crossed over to adhere the power supply material 3, and after electrodeposition / cleaning / drying, the power supply material is peeled off, and then the insulating film 4a is peeled off. The electrodeposition was repeated by the method described above to produce a multicolored surface coloring material.

The multicolor display colored body obtained by this method also had the same effect as in Example 1.

It is also possible to use a photoresist or the like as the insulating film other than the above. In this case, the resist is left at a predetermined position by an exposure method after coating, and finally the resist is stripped with a stripping solution such as an organic solvent. It is also possible.

〔The invention's effect〕

The basic characteristics of the multicolor surface coloring material are, of course, that heat resistance, chemical resistance, and light resistance are sufficiently satisfied, but the color characteristics of the multicolor display device to which the multicolor surface coloring material is applied are That is, a uniform color tone can be obtained. From this point of view, the polymer electrodeposition method is in principle an advantageous means for forming a uniform colored film, and in order to make full use of this advantage, the introduction of the insulating film according to the present invention provides more uniformness. It has become possible to obtain a multicolor surface-colored body having a colored film. Further, the occurrence of defects due to the variation in the thickness of the colored film is eliminated, which can contribute to the industrial and economical aspects.

Table 1 shows the film thickness variation of the colored film according to the present invention and the defective rate of the multicolor display colored body in comparison with the conventional method.

Further, even when it is not desired to electrodeposit on a specific portion, the present invention can easily and accurately achieve the present invention, and the present invention is particularly effective particularly when used in a multicolor display device.

[Brief description of drawings]

FIG. 1 is a plan view of the method according to the present invention, FIG. 2 (a) is a perspective view after the first color electrodeposition of the conventional method, (b) is a perspective view after the second color electrodeposition, and (c) is. Schematic cross-sectional view before the second color electrodeposition, FIG. 3 is a plan view according to the conventional method, FIG. 4 (a) is a perspective view after the first color electrodeposition of the method according to the present invention, and (b) is the second color. A perspective view after electrodeposition, (c) is a schematic cross-sectional view before the third color electrodeposition,
5 and 6 are a plan view and a schematic sectional view showing another embodiment according to the present invention. 1 ... Glass substrate, 2 ... Conductive layer 3 ... Power supply material, 4 ... Insulation film 5 ... Electrodeposition film, 6 ... Display section 7 ... Seal, 8 ... Mounting electrode terminal 9 ... Seal Department

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-23831 (JP, A) JP-A-48-56235 (JP, A) JP-A-50-71729 (JP, A)

Claims (2)

[Claims] 1. A step of preparing a substrate on which a plurality of conductive layers, each of which is provided with a terminal for exclusive use of electrodeposition having a length different depending on a color to be electrodeposited, are insulated from each other, A step of forming an insulating film on the electrode-dedicated terminals of other colors except for the electrode-dedicated terminal of the color; and a step of laterally adhering the power supply material to the electrode-dedicated terminal of the first color, The step of forming the colored layer of the first color on the corresponding conductive layer by the electrodeposition method using the power feeding material as the lead for electrodeposition, and the peeling of the power feeding material and the insulating film on the terminal for exclusive use of the second color electrodeposition And a step of laterally adhering a power feeding material to the second color electrode-dedicated terminal, and using the power feeding material as an electrodeposition lead, a second color layer is formed on the corresponding conductive layer by the electrodeposition method. And the following steps for the third and subsequent colors are repeated. And a step of sequentially forming a colored layer on each of the corresponding conductive layers by an electrodeposition method. 2. The method for producing a multicolor surface coloring body according to claim 1, wherein the peeling of the insulating film is performed at least twice.