JPS6224203A - Glare shielding plastic light filter - Google Patents

Abstract

PURPOSE:To provide high glare shielding performance by using hydrophilic plastics as the material of a substrate and neodymium nitrate as a light absorbing material. CONSTITUTION:Neodymium nitrate is mixed with or impregnated into hydrophilic plastics. Neodymium oxide is dissolved in nitric acid in 51:100 weight ratio to prepare a soln., this soln. is concentrated and solidified by slow heating, and the resulting solid matter is slowly cooled and pulverized with a mortar or mill to obtain fine neodymium nitrate powder assuming light purplish red. This powder is readily soluble in a colorless solvent having hydroxyl groups and absorbs D-rays at a high absorption factor. A very large amount of the fine neodymium nitrate powder can be uniformly mixed and dissolved with hydrophilic plastics such as hydroxyethyl methacrylate.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is directed to E100n, where the human eye has the highest visibility.
This invention relates to a plastic anti-glare filter plate that absorbs light around m.

(Conventional technology) Using the optical spectral characteristics of neodymium compounds, 6
A filter that absorbs light in the vicinity of 00 nm is made by dissolving salts such as neodymium acetate or neodymium methacrylate in methacrylic acid ester using anhydrous tin chloride as a solvent, as shown in Japanese Patent Publication No. 44-5091. This is then heated and polymerized to produce it.

However, because the solubility of neodymium acetate and neodymium methacrylate, which serve as light absorbers, in plastics is extremely low, the resulting filters not only have low light-shielding properties, but also contain harmful gases due to the use of stannic chloride, a chlorine compound. This has the disadvantage of causing environmental pollution due to the occurrence of

(Purpose) In view of these problems, the present invention is capable of effectively blocking light in the vicinity of flOOnm by mixing as high a concentration of neodymium as possible into the base material, while also reducing the generation of harmful gases during manufacturing. To provide an anti-glare filter plate that can completely eliminate glare.

(Structure) That is, the present invention is characterized in that neodymium nitrate is mixed and impregnated into a hydrophilic plastic.

As a result of various research experiments to obtain a neodymium compound with high solubility in plastics, the applicant dissolved neodymium oxide in a weight ratio of 51 parts to 100 parts of nitric acid, and removed heat to e-condense it.

This is solidified and then slowly cooled to solidify. By pulverizing this solid in a mortar or mill, neodymium nitrate [N d (NO3), which has a pale purple-red color, is produced.
3] fine powder was obtained. It was found that this fine powder was colorless and had high solubility in solvents containing hydroxyl groups, and also had a high absorption rate for D-line as shown in FIG. When this fine powder of neodymium nitrate [N d (NO3) 3 ] was mixed with a wood-loving plastic such as hydroxyethyl methacrylate, it was uniformly dissolved up to an extremely high concentration range.

The applicant has proposed that such neodymium nitrate [N d (N
'03) Focusing on the unique properties of 3], we invented an anti-glare plastic filter plate that absorbs nearly 50% of D-line light, where the naked eye has the highest visibility, and has almost no color. Ta.

Therefore, the details of the present invention will be explained below based on examples.

A polymerizing agent is added to hydroxyethyl methacrylate (hereinafter abbreviated as HEMA) as a hydrophilic plastic, and this is put into a mold and formed into a plate-shaped body.

The above hema is commercially available, and its structural formula is: CH2=C-COOH CH3 OH2 OH So, the chain is in the second place, and it is a 2-failure.

When the above-mentioned neodymium nitrate powder is dissolved in a hydrophilic acrylic material melt such as the above-mentioned hema, the wood-philic property of the base plastic becomes 1. In other words, since the OH group and the OH group of neodymium nitrate join hands with each other, the neodymium nitrate powder is uniformly melted at a high concentration in the hydrophilic acrylic material melt. By adding a polymerization agent and a crosslinking agent for reinforcing and crosslinking the chain length to a hydrophilic acrylic material melt containing this neodymium nitrate powder, the D-line is solidified into the desired shape. It is possible to obtain a filter plate of a desired shape that absorbs a high proportion of.

[Example] Neodymium nitrate 8 was melted in hemal OO in a weight ratio, and 0.115 of azobisisobutyrodinitrile was added as a polymerization agent and 5 ethylene glycol dimethacrylate was added as a crosslinking agent to the melt, and this was poured into a mold. Put it in 43°
Polymerization was carried out at C for about 12 hours to obtain a plate-like body.

When the thickness of this plate-like body was set to 2 mm, it was possible to obtain a plastic filter with a high absorption rate of 50% of the D-line incident light and a high anti-glare property. In addition, by adjusting the thickness and the mixing/polymerization ratio of neodymium nitrate, the absorption rate of D-line could be arbitrarily adjusted.

By the way, when forming a filter with a desired shape using the above-mentioned materials, it is desirable to use one of the following three methods.

(1) A chromium plating layer 5 is provided on the polypropylene dish-shaped template 4 as shown in FIG. 4(a) to make the inner surface smooth, or a dish-shaped glass plate or metal plate 14 When using an NO thin film 6 such as Teflon (registered trademark) as a release material, the inner surface is covered as shown in FIG. 4(b).

When the solution according to the above-mentioned formulation is poured into the mold 3 which has been subjected to the peeling treatment in this way and polymerized, a plate-shaped body 11 having an extremely smooth surface is obtained by polymerization as shown in FIG. 5(a). I can do it. The surface of this plate-shaped body 11 can be polished using a moisture-proofing agent such as silicone oil, if necessary.

In addition, even after forming the plate-shaped body 11 in this way, it still has hydrophilicity, albeit slightly, so it is possible to adjust the absorption of D-line by impregnating it with a neodymium nitrate solution. be.

The above filter plate can be used alone, but
As shown in FIG. 5(b), durability can be improved by coating the surface with a film 12 made of a mixed solution of silicone and acrylic resin, for example.

(2) A solution of the above formulation is polymerized on a plastic flat plate 22 which is removably fitted into the mold as described above and is difficult to separate from the plate to be polymerized and solidified, or on a glass flat plate 22, and the plate-like body 21 and The plate 22 and the plate 22 are attached together to form an exposure plate as shown in FIG. be.

(3) The solution of the above formulation is polymerized between the plate-shaped body 31 to be polymerized and solidified and the two flat plates 32 and 33, such as a plastic plate or a glass plate, which are difficult to separate, to form a plate-shaped body as shown in FIG. 5(d). 31 and serves as a protective plate that protects both sides thereof.

In the methods (2) and (3) above, the plastic flat plate or glass flat plate 22, 32, 33 itself can also be used as the mold. That is, as shown in FIG. 4(C), two transparent flat plates 32. which are difficult to peel off, such as plastic or glass.
A frame 7 made of rubber or the like having a predetermined width is interposed between the three peripheral edges of the plate 33, and the two flat plates 32 and 33 are kept at a predetermined distance so that they are substantially parallel to each other. With one peripheral edge facing upward, the plastic solution described above is allowed to flow down to form a polymerized and solidified plate 31. Only the rubber frame 7 will be explained based on the mold.

Next, a second embodiment of the present invention will be described.

To Hema 100 in a weight ratio, 0.115 parts of azobisisobutyrodinitrile as a polymerization agent and 5 parts of ethylene glycol dimethacrylate as a crosslinking agent were added, and the mixture was placed in a mold and polymerized at 43°C for about 12 hours. Fabricate a hydrophilic plastic substrate. When this substrate is immersed in a neodymium nitrate solution in which neodymium nitrate [N d (NO3) 3 ] is dissolved in water for a predetermined period of time, the substrate becomes
Due to its hydrophilic nature, it absorbs neodymium nitrate solution and
It has the spectral absorption characteristics as shown in the figure, and becomes a plastic anti-glare filter plate. Figure 3(b) shows a plate 1 impregnated with a neodymium nitrate solution, both sides of which are coated with colorless and transparent hard plastic 2, which further improves durability. It is.

A light shielding plate according to the present invention obtained as described above is:
Extremely pale blue to blue exhibits an extremely pale purple-red color, but it is almost colorless.However, it absorbs nearly 50% of the D line of the spectrum, so it can be used as an anti-glare filter plate. It can be used for various purposes as described below.

(a) Spectacle lens By using the anti-glare filter plate according to the present invention as a spectacle lens, it absorbs nearly 50% of sunlight's D rays outdoors, so it can be used on the deck of a ship, on the coast, etc. in broad daylight to the naked eye. When used by a driver, it protects the naked eye from the headlights of an oncoming vehicle, and since it absorbs only light other than the D line from indoor incandescent or fluorescent lamps, it does not lose its brightness. It does not cause fatigue to the naked eye, and since it is almost colorless, it is visible even in the dark as if it were the naked eye, does not darken like sunglasses, and does not change the appearance of the wearer.

(b) Automobile windshield or headlight filter plate, whereas conventional automobile sun visors are colored, the filter plate according to the present invention is almost colorless and transparent, so that it can be easily To prevent a driver from being dangerous even if the surroundings become dark after entering a tunnel, etc., and to protect the driver's eyes from sunlight and the headlights of an oncoming vehicle, thereby reducing driver fatigue. For the same purpose, it is installed on the surface of a car's rearview mirror (side mirror, room mirror) to protect the naked eye from strong reflected light.

(C) Front filter plate of color television Since the filter plate according to the present invention is almost colorless, it can be used in front of the cathode ray tube of a color television receiver to prevent image flickering and brighten the image without changing one color tone. You can obtain images with sharp colors.

(Effects) As explained above, according to the present invention, since a hydrophilic plastic is used as the base substrate and neodymium nitrate is used as the light absorption material, a large amount of neodymium salt can be mixed into the substrate material, and the 600 nm Not only can it reliably absorb nearby light and provide high anti-glare properties, but it also eliminates the need for solvents containing harmful substances such as chlorine, simplifying the manufacturing process and maintaining the cleanliness of the environment. can do.

Furthermore, since a wood-philic plastic is used for the base substrate, it can be formed into a flexible thin film and can be attached to glass surfaces, glasses, etc.

[Brief explanation of drawings]

Fig. 1 is a human visibility curve diagram, Fig. 2 is a characteristic curve diagram showing an example of spectral absorption of the anti-glare filter plate according to the present invention, and Fig. 3 (a) is a perspective view showing an example of the present invention. Figure, same figure (b
) is a cross-sectional side view showing another embodiment, and FIGS. 4(a) to (
C) is a cross-sectional side view showing an example of the molding frame used in the present invention, and FIGS. 5(a) to (d) are cross-sectional views showing other examples according to the present invention, respectively. . 1.11.21.31... Plate body 2... Colorless transparent hard plastic 3... Mold
4... Polypropylene type 5... Chrome plating layer 6... Release material 12... Moisture-proof coating 14... Glass or metal template 22.32.33... Protective plate Applicant Manami Matsuoka (and 1 other person) Agent Patent attorney Keiji Nishikawa Katsuhiko Kimura α) Correct it (b) Correct it 5 times (C) 2! Correction χ5 Figure (cl) 7?

Claims (1)

[Claims] A plastic anti-glare filter plate made of a hydrophilic plastic base mixed with and impregnated with neodymium nitrate.