JP3944277B2 - Color filter and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a color filter that attenuates light of a specific wavelength and allows light to pass therethrough and a method for manufacturing the same.
[0002]
[Prior art]
Conventionally, as this type of color filter, (a) a resin mixed with a dye such as an acrylic resin or a polycarbonate resin, (b) a resin mixed with a dry powder pigment in a resin such as an acrylic resin or a polycarbonate resin, There were (c) a heat-resistant pigment mixed in glass, and (d) a film that attenuates light of a specific wavelength deposited on the surface of the glass.
[0003]
[Problems to be solved by the invention]
The color filter of the type (a) has little turbidity and good transparency because the dye dissolves in the resin. In the type (b), since the refractive index (density) of the resin and the pigment is close to each other, birefringence hardly occurs at the interface between the resin and the pigment, so that the turbidity is small and the transparency is not so deteriorated. However, since the types (a) and (b) are made of resin, there is a problem that heat resistance is inferior. For this reason, for example, when it is used for a projector to change the spectral distribution of light emitted from the light source of the projector to a desired distribution, a large cooling device is required to cool the filter. Therefore, it is necessary to increase the distance between the light source and the filter, and as a result, there is a problem that the apparatus is increased in size. Moreover, since it was comprised with resin, there also existed a problem that there exists a possibility of cracking.
[0004]
Since the color filter of the type (c) is made of glass, the heat resistance is excellent. Further, since the pigment is mixed and dissolved in the molten glass, the transparency is also good. However, since pigments are mixed and melted in molten glass, only pigments that can withstand them can be used, so organic pigments (generally better in coloring power than inorganic pigments and many types) cannot be used, and pigments that can be used There was a problem that the kind of was limited. In addition, color irregularities, contamination of foreign matter, and product quality variations from lot to lot are likely to occur, and a lot of adjustment and correction work is required in the manufacturing process. There was also a problem of poor moldability.
[0005]
Furthermore, the type (d) of the color filter has problems such as the production method being likely to cause variations in product quality from lot to lot, high manufacturing costs, and poor moldability.
[0006]
This invention is made | formed in view of such a situation, and one objective of this invention is to provide a color filter with high transparency, and its manufacturing method.
[0007]
Another object of the present invention is to provide a color filter having excellent heat resistance and a method for producing the same.
[0008]
Another object of the present invention is to provide a color filter that can use an organic pigment and has a wide selection range of the pigment, and a method for producing the same.
[0009]
Another object of the present invention is to provide a color filter that does not easily cause color unevenness, contamination of foreign matter, and variation in product quality from lot to lot, and does not require much adjustment and correction work in the manufacturing process, and a method for manufacturing the same. is there.
[0010]
Another object of the present invention is to provide a color filter having good moldability and a method for producing the same.
[0011]
Another object of the present invention is to provide a color filter that does not break and a method for manufacturing the same.
[0012]
Another object of the present invention is to provide a color filter that can be brought into close contact with another optical element such as a light source to reduce light loss and a method for manufacturing the same.
[0013]
Another object of the present invention is to provide a color filter having excellent weather resistance and a method for producing the same.
[0014]
Still other objects of the present invention will become apparent from the following description.
[0015]
[Means for Solving the Problems]
In the color filter and the manufacturing method thereof according to the first aspect of the present invention, the pigment synthesized in the aqueous medium is subjected to a flushing treatment and dispersed in the rubber elastic material. Specifically, a pigment synthesized in an aqueous medium is mixed with silicone oil or liquid silicone (LSR) in an undried state, and after phase inversion from an aqueous phase to silicone oil or liquid silicone phase (ie, After the pigment is dispersed in the silicone oil or liquid silicone phase and moisture is separated and removed from the silicone oil or liquid silicone phase), the pigment dispersed in the silicone oil or liquid silicone phase is mixed with the liquid silicone (LSR). dispersing the pigment in a liquid-like silicone (LSR) phase by. Thereafter, liquid silicone (LSR) (rubber elastic material) in which the pigment is dispersed is formed into a color filter.
[0016]
In the color filter and method for producing the same according to the second aspect of the present invention, the pigment particles subjected to the flushing treatment as in the case of the first aspect of the present invention are dispersed not in the rubber elastic material but in the silicone resin phase , and the resin is molded. Color filter.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
In general, when particles are dispersed in a transparent substance, it is said that good transparency can be obtained when the particle diameter of the particles is 1/3 or less of the wavelength of light.
[0018]
On the other hand, generally, the pigment production process includes (1) a synthesis reaction process for synthesizing a pigment in an aqueous medium, and (2) dehydrating the pigment-dispersed aqueous solution obtained by the process (1) to obtain a water content of about A dehydration step of making a wet pigment cake (wet cake) of 30 to 80%, (3) a drying step of completely drying the wet cake, and (4) a dry cake obtained by the step (3). It consists of four steps of pulverization step. The dry powdery pigment particles obtained through the steps (3) and (4) are aggregated by a large cohesive force to form an aggregate having a large particle size.
[0019]
Therefore, if the dry powder pigment is mixed and dispersed in a rubber elastic material or resin, (i) the pigment particles remain in the form of aggregates having a large particle size of 1/3 or more of the wavelength of light. In addition to being dispersed in the rubber elastic body, (ii) the formation of such an aggregate deteriorates the wettability of the pigment particles, and an air layer is formed between the pigment particles and the rubber elastic body material. Since birefringence occurs in the layer, the turbidity increases and the transparency deteriorates.
[0020]
However, in the present invention, a pigment synthesized in an aqueous medium is not subjected to a dry powdery pigment, but is subjected to a flushing treatment as described above and dispersed in a liquid silicone (LSR) (rubber elastic material) or silicone resin phase . Let A pigment in an undried state synthesized in an aqueous medium maintains the state of primary particles without agglomeration, or even when agglomerated, its cohesive force is extremely weak. By dispersing in the rubber elastic material, aggregation of the pigment particles can be prevented. Accordingly, the particle size of the pigment particles can be reduced to 1/3 or less of the wavelength of light, and the pigment particles are improved in wetness, and an air layer is formed between the pigment particles and the rubber elastic material. Since birefringence can be prevented from occurring in the air layer, the turbidity of the obtained color filter can be reduced and the transparency can be improved.
[0021]
In addition, the dispersion process of pigment particles in the rubber elastic material or resin and the molding process of the rubber elastic material or resin are both steps of mixing the pigment into the molten glass in the color filter of the type (c). Therefore, organic pigments can be used, and the selection range of pigments is widened.
[0022]
In addition, color unevenness, contamination of foreign matters, and variation in product quality from lot to lot are unlikely to occur, and a lot of adjustment correction work in the manufacturing process is not required.
[0023]
Further, since it is formed by a rubber elastic material or resin, moldability very well, Ru can be changed thickness freely.
[0024]
Since the color filter obtained by the first aspect of the present invention is composed of a rubber elastic body, the heat resistance can be improved as compared with conventional color filters made of acrylic resin or polycarbonate resin.
[0025]
Moreover, since it has rubber elasticity, it does not break like a resin or glass color filter.
[0026]
In addition, since it has rubber elasticity and heat resistance, it is brought into close contact with other optical elements such as a light source, an air layer is formed between the other optical elements and the color filter, and light loss is caused by surface reflection due to the presence of the air layer. Can be prevented from occurring.
[0027]
The color filter formed from the rubber elastic material may be gel. In this way, when the rubber elastic material is made into a gel, the shape of the color filter can be maintained, for example, by surrounding the frame with a frame or the like.
[0028]
Cie recone resin put in the second invention, since it is excellent resin heat resistance can be obtained the first superior color filter as in the case the heat resistance of the present invention.
[0029]
Since the color filter obtained by the second aspect of the present invention does not have rubber elasticity, the effect based on the rubber elasticity in the first aspect of the invention cannot be obtained, but since it has rigidity, means for holding the color filter is provided. They are unnecessary and can be used in the same manner as conventional glass and resin filters.
[0030]
The first and second aspects of the present invention can be applied to color filters for a wide range of uses, such as color filters for projectors, projector televisions, or analytical instruments, and color caps that are placed on light bulbs.
[0031]
【Example】
The present invention will be described below with reference to embodiments shown in the drawings.
[0032]
Example 1
A color filter was prepared by the following steps (a) to (c).
[0033]
(A) A pigment wet cake (Dainippon Ink Chemical Co., Ltd.) is mixed with silicone oil and stirred with a kneader and three ink rolls. At that time, heat is not applied at first, but a strong share is applied, and after the dehydration has progressed to some extent, the kneader and the three ink rolls are heated to about 50 to 100 ° C. to further promote the dehydration. . As a result, a flushing process is performed, and the pigment is dispersed in the silicone oil phase and moisture is separated and removed from the silicone oil phase.
[0034]
(B) The pigment after the primary dehydration in the step (a) is put in a vacuum oven heated to about 30 to 100 ° C. for an appropriate time to remove a trace amount of residual water (this step becomes a secondary dehydration step). .
[0035]
(C) The pigment that has been subjected to the flushing treatment in steps (a) and (b) and is dispersed in the silicone oil phase is dispersed in liquid silicone (LSR), and the same process as in the case of molding of normal liquid silicone is performed. The color filter 1 was formed into a disk shape as shown in FIGS. Note that the liquid silicone is crosslinked simultaneously with this molding.
[0036]
(Example 2)
A color filter was prepared in the same manner as in Example 1 except that the pigment was flushed using liquid silicone (LSR) instead of the silicone oil in Example 1.
[0037]
(Example 3)
In the step corresponding to step (c) of Example 1, the pigment that had been subjected to the flushing treatment was dispersed in a silicone resin instead of liquid silicone. Otherwise, a color filter was prepared by the same process as in Example 1.
[0038]
Example 4
The pigment is flushed using liquid silicone (LSR) instead of the silicone oil in Example 1, and the pigment that has been flushed in the step ( c ) of Example 1 is liquid. Dispersed in silicone resin instead of silicone. Otherwise, a color filter was prepared by the same process as in Example 1.
[0039]
All of the color filters obtained in the above examples showed very good transparency.
[0040]
In each of the above embodiments, the color filter has a disk shape. However, in the present invention, the color filter may not have a disk shape, and may have another shape, and the thickness may not be uniform and change. You may do it.
[0041]
Moreover, in this invention, functions, such as an ultraviolet-ray and an infrared cut, can also be given by mixing materials, such as an ultraviolet-ray and an infrared cut, into a rubber elastic body material or resin.
[0042]
【The invention's effect】
As described above, the present invention
(A) The transparency of the obtained color filter can be made favorable.
(B) Organic pigments can also be used, and the pigment selection range is wide.
(C) Color unevenness, contamination of foreign matter, and variation in product quality from lot to lot are unlikely to occur, and a lot of adjustment correction work in the manufacturing process is not required.
(D) Formability is very good and the thickness can be changed freely without being uniform.
(E) since a pigment is dispersed rubber elastic material (LSR) or a silicone resin material excellent heat resistance that, it is possible to improve the heat resistance,
Since a pigment is dispersed is excellent material weatherability that (f) the rubber elastic material (LSR) or a silicone resin, it is possible to improve the weather resistance,
(G) if Ru a pigment dispersed in the rubber elastic material (LSR) has never cracked,
(H) if Ru a pigment dispersed in the rubber elastic material (LSR) is brought into close contact with other optical elements such as the light source, the air layer air layer is formed between the other optical element and a color filter Can prevent light loss due to surface reflection due to the presence of
It is possible to obtain excellent effects such as.
[Brief description of the drawings]
FIG. 1 is a front view showing a color filter according to the present invention obtained by Example 1. FIG.
FIG. 2 is an enlarged cross-sectional view taken along the line II-II in FIG.
[Explanation of symbols]
1 Color filter

Claims (8)

A pigment synthesized in an aqueous medium is mixed with a silicone oil or liquid silicone (LSR) in an undried state to disperse the pigment in the silicone oil or liquid silicone (LSR) phase, and water is added to the silicone oil or liquid silicone. after separation and removal from (LSR) phase was the pigment is dispersed in liquid silicone (LSR) phase by mixing the pigment dispersed in the silicone oil or liquid silicone (LSR) phase liquid silicone (LSR) Color filter formed by molding things. After the pigment was dispersed in liquid silicone (LSR) phase by mixing the pigment dispersed in the silicone oil or liquid silicone (LSR) phase liquid silicone (LSR), crosslinking the liquid silicone (LSR) The color filter according to claim 1. A pigment synthesized in an aqueous medium is mixed with a silicone oil or liquid silicone (LSR) in an undried state to disperse the pigment in the silicone oil or liquid silicone (LSR) phase, and moisture is mixed with the silicone oil or liquid silicone. after separation and removal from (LSR) phase, by molding a dispersion of the pigment to the silicone resin phase by mixing the pigment dispersed in the silicone oil or liquid silicone (LSR) phase to the silicone resin Color filter that becomes. The color filter according to claim 3, wherein the silicone resin is crosslinked after the pigment is dispersed in the silicone resin phase . A pigment synthesized in an aqueous medium is mixed with silicone oil or liquid silicone (LSR) in an undried state, and the pigment is heated to the silicone oil or liquid silicone (LSR) phase without first heating. after the water with dispersing it was separated and removed from the silicone oil or liquid silicone (LSR) phase, the pigment by mixing the pigment dispersed in the silicone oil or liquid silicone (LSR) phase liquid silicone (LSR) In a liquid silicone (LSR) phase , and thereafter forming the liquid silicone (LSR) into a color filter. After dispersing the pigment in a liquid-like silicone (LSR) phase by mixing the pigment dispersed in the silicone oil or liquid silicone (LSR) phase liquid silicone (LSR), the liquid silicone (LSR) The method for producing a color filter according to claim 5, which is crosslinked. A pigment synthesized in an aqueous medium is mixed with silicone oil or liquid silicone (LSR) in an undried state, and the pigment is heated to the silicone oil or liquid silicone (LSR) phase without first heating. after the water with dispersing it was separated and removed from the silicone oil or liquid silicone (LSR) phase, the silicone the pigment by mixing the pigment dispersed in the silicone oil or liquid silicone (LSR) phase to the silicone resin A method for producing a color filter, comprising dispersing in a resin phase and then molding the silicone resin to form a color filter. The method for producing a color filter according to claim 7 , wherein the silicone resin is crosslinked after the pigment is dispersed in the silicone resin phase .

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