JP2000109710A - Translucent luminous resin and its molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject resin capable of providing a molded product improved in light transmittance, having a raised afterglow luminance and capable of recognizing the opposite side in a plane in the visible direction by cutting a luminous pigment having a fine particle diameter and using a luminous pigment having a coarse particle diameter in a predominant quantity and mixing the luminous pigments with a resin. SOLUTION: This resin is obtained by mixing (A) 1-4 wt.% of a luminous pigment having >=20 μm particle diameter and (B) <=1 wt.% of a luminous pigment having <20 μm particle diameter with a resin so as to provide 1-4 wt.% of the total amount of the luminous pigments. For example, SrAl2O4: Eu,Dy having the particle diameter of 20-200 μm accounting for 95% is used and a colorless polycarbonate is used as the resin. The luminous pigments are mixed with the polycarbonate in 3:97 ratio expressed in terms of weight and the resultant mixture is then molded into a boardlike form having 3 mm thickness. For example, the interior wrapped in an exterior finish part is visible therethrough by using the resultant molded product in the external finish part. The visibility of the exterior finish part can be improved in the dark.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a resin containing a luminous pigment and a molded article thereof.

[0002]

2. Description of the Related Art Conventionally, the particle size of a phosphorescent pigment mixed or contained in a resin molded article containing a phosphorescent pigment is from several μm to several tens of μm or several hundred μm when it is large. And the average particle size was 10 to 20 μm.

[0003]

However, from the conventional fine to coarse ones, the average particle size is one.
In a resin molded product containing or containing a luminous pigment of 0 to 20 μm, the luminous pigment is finely and densely dispersed in the resin, so that if the content of the luminous pigment in the resin exceeds several percent, light transmission will occur. However, there is a problem that the side opposite to the viewing direction surface of the resin molded product is difficult to see. As a specific example, FIG. 2 shows a conventional resin molded product containing a luminous pigment as viewed from above. SrAl2O4: Eu, Dy occupying 70% of the particle diameter of less than 20 μm is used as the luminous pigment, and colorless polycarbonate is used as the resin. These luminous pigments and polycarbonate were mixed at a ratio of 3:97, and formed into a plate having a thickness of 3 mm. Several μm
Since a large amount of luminous pigments with a fine particle diameter of from 20 μm are contained, the luminous pigments are densely dispersed in the resin, the light transmittance is poor, and the background opposite to the viewing direction of the resin molded product is good. can not see. In addition, it appears that the entire resin molded product emits light in the dark after irradiation with a fluorescent lamp or sunlight.

[0004]

According to the present invention, in order to solve these problems, a luminous pigment having a small particle diameter is cut and a luminous pigment having a coarse particle diameter is mainly mixed with a resin. For example, (1) the content of the phosphorescent pigment in the resin having a particle size of less than 20 μm is 1% by weight or less, and the content of the phosphorescent pigment in the resin having a particle size of 20 μm or more is 1% by weight.
Not more than 4% and the total amount of the luminous pigment is 1% by weight.
Not less than 4%. (2) A pigment having a D10 of 10 μm or more, which is located at 10% by weight from the smaller particle size of the pigment, is mixed with the resin. At this time, the ratio of the luminous pigment is adjusted from 0.5% to 4.5% by weight.

As a result, the amount of the luminous pigment having a small particle size is small, and the luminous pigment has a coarse particle diameter as a whole. Therefore, the luminous pigment in the resin is sparsely dispersed, and the particle size having a small light transmittance is large. It is better than things. Further, since the afterglow brightness increases as the particle size of the luminous pigment increases, the afterglow luminance of the resin containing the luminous pigment also increases. Therefore, it is possible to recognize the opposite side of the surface of the resin molded product in the viewing direction while maintaining the luminous property. In addition, the resin molded article appears to emit light at a point in the dark after being irradiated with a fluorescent lamp or sunlight, and the decorativeness is improved.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on embodiments. (Example 1) FIG. 1 shows a top view of a resin molded product containing a luminous pigment of the present invention. 20μm as luminous pigment
SrAl2 occupying 95% of a particle size of not less than 200 μm and not more than 200 μm.
O4: Eu, Dy was used, and colorless polycarbonate was used as the resin. The luminous pigment and the polycarbonate were mixed at a weight ratio of 3:97, and the thickness was 3 mm.
Into a plate shape. Since there are few fine phosphorescent pigments of less than 20 μm, the dispersion of the phosphorescent pigment in the molded article is sparse, the light transmittance is high, and the background opposite to the viewing direction surface can be seen. In addition, since coarse luminous pigments are scattered in the resin molded product, the resin molded product appears to emit dots in the dark after being irradiated with a fluorescent lamp or sunlight. (Example 2) Table 1 shows a list of luminance and light transmittance of a resin molded product containing a luminous pigment. The ratio of the phosphorescent pigment to the colorless and transparent polycarbonate as a resin molded product is 3: 9 by weight.
A plate having a thickness of 2 mm mixed at a ratio of 7 was produced. Luminescent pigments have a coarse particle size of 20 μm or more of 33%, 50%, 6% or less.
Four types, 6% and 100%, were prepared. The afterglow luminance is 33% by the ratio of the particle size of 20 μm or more to the luminous pigment.
Assuming that% is 100, the higher the ratio, the higher the ratio. This is because the larger the particle size of the luminous pigment, the higher the afterglow luminance of the luminous pigment itself. Further, from the viewpoint of light transmission, when the ratio of the particle diameter of 20 μm or more in the luminous pigment is 33%, the background on the opposite side of the resin molded product is hardly visible, but is slightly visible at 50% and at 66%. Looks pretty good. In addition, the higher the ratio of the particle diameter of 20 μm or more in the luminous pigment, the more the luminous pigment appears to emit light in terms of light emission. As described above, when the ratio of the particle diameter of 20 μm or more to the luminous pigment is 50% or more, the afterglow luminance is increased and the light transmittance is improved.

[0007]

【table 1】

(Example 3) Table 2 shows a list of afterglow luminance and light transmittance of a resin molded article containing a luminous pigment having a coarse particle diameter. The particle size of the luminous pigment is not less than 20 μm and not more than 200 μm, and the proportion of the resin molded article containing the luminous pigment is 0.5%, 1%, 2%, 3%, 4%, 5% by weight. A resin molded plate having a thickness of 2 mm was produced. S as a luminous pigment
rAl2O4: Polycarbonate was used as a resin with Eu and Dy. The afterglow luminance increases as the ratio of the luminous pigment increases, but at 4%, the light transmittance slightly deteriorates, and
%, Light transmission is almost lost. In the case of 0.5%, the light transmittance is good, but the afterglow luminance is very low, and the visibility in darkness is poor. From the above, the ratio of the luminous pigment is 0.5% to 4% by weight in order to obtain a high afterglow luminance and a high light transmittance as a resin molded article containing the luminous pigment.
% Is good.

[0009]

[Table 2]

(Example 4) Table 3 shows a list of the particle size distribution of the luminous pigment. Fine pigments are reduced in the order of pigments 1, 2, and 3.

[0011]

[Table 3]

Table 4 shows a list of afterglow luminance and light transmittance of the resin molded article containing the luminous pigment of each particle size distribution. The pigments shown in Table 3 are used as the phosphorescent pigments. As the resin, a transparent methacrylic resin is used. The ratio of the luminous pigment of SrAl2O4: Eu, Dy is mixed from 0.3% to 5% by weight, and the thickness is 2%.
mm plates were molded. The afterglow luminance increases as the luminous pigment has a small fine particle diameter and increases as the ratio of the luminous pigment increases. In the case of the pigment 1, the light transmittance is slightly good when the pigment ratio is 1% or less, but the transmittance hardly disappears when the pigment ratio is more than 1%. In the case of Pigment 2, the light transmittance is good at a pigment ratio of 1% or less, slightly good up to 4%, and almost non-transmissive at 5%. In the case of Pigment 3, light transmittance is good at a pigment ratio of 3% or less, and slightly good at 4% and 5%.
Then it gets pretty bad. From the above, D10 at the position of 10% by weight from the smaller particle size of the luminous pigment was 15 μm.
When the pigment ratio in the resin is at least 4 m and the weight of the pigment in the resin is at most 4%, the light transmittance will be good, and the light will be emitted in the form of dots in the dark after irradiation with light such as sunlight or a fluorescent lamp.

[0013]

[Table 4]

(Example 5) The luminous pigment of Pigment 3 in Table 3 and the transparent methacrylic resin were 1:19, 1: 9, 1: 1 by weight.
Made with 4 and 1: 1 mixed pellets. For each of the pellets having a different ratio of the luminous pigment, a transparent methacryl pellet is added to the luminous pigment in a weight of 0.3.
%, 0.5%, 1%, 2%, 3%, 4%, and 5%. SrAl2O4; E as a luminous pigment
u and Dy were used. A plate having a thickness of 2 mm was injection-molded using these mixed pellets. The light transmittance and relative afterglow luminance of each plate were almost the same as the results of Pigment 3 in Table 4. (Example 6) 1% by weight of a luminous pigment of Pigment 3 shown in Table 3 and a pink permeable colorant were mixed with methacrylic resin to prepare a plate having a thickness of 2 mm. Further, each of the prue, green, and yellow permeable colorants is mixed in the same manner, and the thickness is 2
mm plates were made. Since each of them is colored with light transmissivity, the light-storing pigment emits dots in the dark after irradiating with sunlight or fluorescent light while maintaining the transparency in a light place. Further, in a light place, a clearer color can be obtained than in the case where a conventional phosphorescent pigment having a large fine particle size is used.
When SrAl2O4: Eu, Dy is used as the luminous pigment, the luminous color of the luminous pigment is yellow-green, and when the color is pink, the luminescent color is yellow, and when the color is blue, the luminescent color is dark green, When the color is yellow, the luminescent color becomes darker, and when the color is green, the luminescent color hardly changes. Sr4Al14O25: Eu, D as a luminous pigment
When y is used, the luminescent color of the luminous pigment is blue-green, the luminescent color is yellow when the color is pink, the luminescent color is darker when the color is blue, and the luminescent color is green when the color is yellow. When it is made green, the emission color becomes green. As described above, when a luminous pigment having a small particle size is mixed with a resin, not only can the transparent coloring be performed, but also a luminescent color different from the luminescent color of the luminous pigment in the dark can be obtained. Can be. (Embodiment 7) FIG. 3 shows a top view of a resin molded product obtained by mixing a luminous pigment and a color pigment according to the present invention. The luminous pigment 2 of the pigment 3 in Table 3 was 1% by weight and the particle size distribution was D10: 3.
1% by weight of aluminum powder (color pigment 3) of 5 μm, D50: 85 μm, and D90: 130 μm was mixed with methacrylic resin to prepare a plate having a thickness of 2 mm. in this case,
Since both the phosphorescent pigment 2 and the aluminum powder (color pigment 3) have few fine particles, the resin plate has light transmittance.
Therefore, this resin emits in the form of dots in the dark after irradiation with sunlight or light from a fluorescent lamp. Further, since various colors can be produced by coloring aluminum powder by oxidation, the appearance of a resin mixed with a luminous pigment in a light place can be made various shades. The same effect can be obtained not only by the aluminum powder but also by other pigments having a small particle size (pigments having the same particle size as the luminous pigment) as the coloring pigment 3. (Embodiment 8) FIGS. 4 and 5 are sectional views of a resin molded product mixed with the luminous pigment of the present invention. 2% by weight of the luminous pigment 2 of the pigment 3 in Table 3 is mixed with the resin 1 and molded. At that time, the surface of the resin molded product was not mirror-finished, but unevenness 4 (matte,
The luminous pigment 2 can be made inconspicuous by applying a mud-like shape, a plain shape or a fine pattern. Further, pits appearing on the surface of the resin molded product due to the luminous pigment 2 can be made inconspicuous.

As described above, the scintillating pigment of the luminous pigment is removed or reduced, and the ratio of the coarse pigment is increased and mixed with the resin to increase the afterglow luminance of the resin molded product in the dark. Not only can the visibility be improved, but also in a bright place, the background on the opposite side of the resin molded product can be seen. In addition, by mixing a transparent coloring hunt with a resin together with a fine phosphorescent pigment with a small particle size, clear coloring can be achieved while giving transparency, and the appearance in a bright place can be improved, and in the dark Can change the emission color. In addition, by mixing the resin with a fine pigment having a small particle size and a fine luminous pigment having a small particle size, clear coloring can be performed while imparting transparency, and the appearance in a bright place can be improved. Further, by making the surface of the resin molded article uneven, the luminous pigment can be made inconspicuous.

Similar results are obtained for all permeable resins such as polypropylene, AS resin, vinyl chloride, polystyrene, polyurethane resin and polyethylene in addition to polycarbonate and methacrylic resin (PMMA) as the base resin. If these luminous pigmented resins are used for the exterior of mobile phones, watches, audio, game consoles, remote controls, headphones, etc., they emit light in the form of dots in the dark to enhance visibility and enjoy the appearance, and are bright. In the place, the inside can be seen through.

[0017]

As described above, according to the present invention,
By mainly using coarse phosphorescent pigments in the resin containing phosphorescent pigments, compared to those containing many phosphorescent pigments with a fine particle size, if the content of the same amount of phosphorescent pigment is used, resin molded products Not only improves the light transmittance, but also increases the afterglow luminance. Therefore, by using the resin containing the luminous pigment of the present invention for the exterior component, the interior wrapped in the exterior component can be seen through, and the visibility of the exterior component in the dark can be improved. Further, by adding a coloring agent or a coloring pigment, the appearance in a bright place can be changed or the color of light emitted in the dark can be changed. Further, by providing fine irregularities on the surface of the resin molded product, the luminous pigment can be made inconspicuous.

[Brief description of the drawings]

FIG. 1 is a top view of a resin molded article containing a luminous pigment of the present invention.

FIG. 2 is a top view of a conventional resin molded product containing a luminous pigment.

FIG. 3 is a top view of the resin molded article containing the luminous pigment of the present invention.

FIG. 4 is a sectional view of a resin molded article containing a luminous pigment of the present invention.

FIG. 5 is a sectional view of a resin molded article containing a luminous pigment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin 2 Luminescent pigment 3 Color pigment 4 Unevenness

Claims (7)

[Claims] 1. A luminous pigment having a particle diameter of 20 μm or more is 1% to 4% by weight, a luminous pigment having a particle diameter of less than 20 μm is 1% or less by weight, and 1% by weight of the entire luminous pigment. A translucent luminous resin, wherein a luminous pigment is mixed or contained in the resin so as to be at least 4%. 2. The molded article of translucent luminous resin according to claim 1, wherein the molded article is molded using translucent luminous resin. 3. 10% by weight of the pigment having a smaller particle size
Characterized in that a luminous pigment whose D10 is 10 μm or more is mixed with the resin. 4. 10% by weight of a pigment having a smaller particle size
Characterized in that a luminous pigment having a D10 of 10 μm or more is mixed or contained in the resin in a weight of 0.5% or more and 4% or less. 5. The translucent luminous resin according to claim 1, wherein a translucent colored dye is mixed, and a molded article thereof. 6. 10% by weight of the pigment having a smaller particle size
The translucent luminous resin according to any one of claims 1 to 4, wherein a pigment having a D10 of 10 µm or more is mixed and a molded article thereof. 7. The semi-transmissive luminous resin molded product according to claim 1, wherein the translucent luminous resin is used for the outer case.