JP2019079035A - Resin composition - Google Patents

Abstract

To propose a resin composition which has high permeability and high diffusibility.SOLUTION: A resin composition contains a white pigment, a light diffusion agent and polycarbonate, and has light permeability. As the white pigment, titanium oxide can be used. As the light diffusion agent, one including at least one selected from an inorganic light diffusion agent, an acrylic light diffusion agent and a silicon light diffusion agent can be used. The resin composition has a translucent part of which at least a part has a fixed wall thickness, is formed into at least one shape of a flat surface shape and a curved surface shape, and has light permeability, and a light introduction surface which introduces light toward the translucent part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a resin composition having light transmittance.

  For example, in game machines and the like, decorative members using a resin composition having light transparency are used. For example, Patent Document 1 proposes a decoration member of a gaming machine which emits light using a light guide member which performs surface light emission. This decorative member uses the light diffusing member that reflects the light of the light guiding member to perform effects by light emission.

JP, 2016-116909, A

  The light guide member of Patent Document 1 is a member that appears to emit light in a wide range by introducing and diffusing light from a light. Such surface emitting members conventionally contain a large amount of light diffusing agent in order to realize a large amount of light emission. Therefore, the permeability of the member decreases, and it is disposed and used at a place not directly viewed by the player as in Patent Document 1, or the permeability is low, and the inside is externally It was used as an invisible one. That is, the low transparency has limited the application and the idea of decoration.

  An object of the present invention is to propose a resin composition having high permeability and high diffusivity.

  One embodiment of the present invention is a resin composition containing a white pigment, a light diffusing agent, and a polycarbonate and having light transmittance. Such a resin composition can highly enhance the light diffusion effect, although the clear reason is not always clear. Therefore, the compounding amount of the light diffusing agent can be reduced, and the light diffusing effect can be enhanced while maintaining high transparency, and bright light can be emitted.

  In the resin composition described above, at least titanium oxide may be contained as a white pigment. By using titanium oxide, the light diffusion effect can be further enhanced. In addition, when a titanium oxide is contained in the resin composition in 0.00005-0.01 mass%, a light emission function can be exhibited, maintaining transparency of a resin composition highly.

  In the resin composition described above, the light diffusing agent may contain at least one of an inorganic light diffusing agent, an acrylic light diffusing agent, and a silicon light diffusing agent. Such a light diffusing agent can further enhance the light diffusing effect. When the silicon-based light diffusing agent is contained in the resin composition in the range of 0.0005 to 0.1% by mass, the light emitting function can be enhanced while maintaining the transparency of the resin composition.

  At least a part of the resin composition described above has a constant thickness and is formed in at least one of a planar shape and a curved surface shape, and a light transmitting portion having light transparency, The light introduction surface which introduces the light which goes to a light part may be provided.

  With the resin composition configured as described above, diffusion of light introduced from the light introducing surface by the light transmitting portion can be favorably realized.

FIG. 1A is a plan view of the resin composition, and FIG. 1B is a cross-sectional view of IB-IB.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiment is only one form of the present invention, and the present invention is not limited to the following embodiment in any way, and various modifications may be made within the technical scope of the present invention. Nor.

[1. Material Used for Production of Resin Composition]
The resin composition of the present embodiment is a composition containing a white pigment, a light diffusing agent, and a polycarbonate. The resin composition may contain materials other than these.

(I) White pigment As the white pigment, known ones can be used. For example, titanium oxide, alumina, talc, mica, zinc oxide, zinc sulfide, aluminum hydroxide, barium sulfate, potassium titanate, zirconium oxide or the like can be used.
In addition, as a result of the inventor's research, it has become clear that, particularly using titanium oxide, it is possible to achieve high compatibility between the transparency and the luminous property, which are the effects of the present invention.

These white pigments may be used in the range of 0.00005 to 0.01% by mass, based on 100% by mass of the entire resin composition, in order to achieve high compatibility between transmission and light emission. By setting the content to 0.0001% by mass or more, a higher degree of light emission (diffusivity) can be realized, and by being 0.005% by mass or less, particularly 0.001% by mass or less, higher degree of transmission can be realized .
Further, as the white pigment, for example, those having an average particle diameter in the range of 0.01 to 1 μm can be used.

(Ii) Light Diffusing Agent Similar to the white pigment, any known light diffusing agent can be used. For example, at least one of an inorganic light diffusing agent, an acrylic light diffusing agent, and a silicon light diffusing agent can be used.

  As the inorganic light diffusing agent, for example, calcium carbonate, silicon dioxide (silica), white carbon, fused silica, magnesium oxide, boron oxide, boron nitride, aluminum nitride, silicon nitride, silicon nitride, barium carbonate, magnesium carbonate, calcium hydroxide, Use magnesium hydroxide, calcium silicate, magnesium silicate, aluminum silicate, sodium silicate aluminium, zinc silicate, glass particles, glass fiber, glass flake, wollastonite, zeolite, sepiolite, bentonite, montmorillonite, hydrotalcite, kaolin, etc. be able to.

  As an acryl-type light-diffusion agent, the polymer of a 1 or more types of (meth) acrylic-type monomer, a copolymer, and these mixtures can be used. For example, fine particles of acrylic, poly (meth) acrylic acid ester, acrylic-styrene copolymer, etc. may be adopted. Examples of acrylic monomers include, for example, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, n-butyl methacrylate, hexyl methacrylate, cyclohexyl methacrylate, phenyl methacrylate, benzyl methacrylate, phenoxy methacrylate, phenoxyethyl methacrylate, methyl acrylate, Ethyl acrylate, propyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate and the like can be mentioned.

  As a silicone type light diffusing agent, microparticles | fine-particles, such as a siloxane and a silicone resin, can be used. As a silicone resin, silsesquioxane can be used. Specific examples thereof include polymethylsilsesquioxane, polyethylsilsesquioxane, polypropylsilsesquioxane, polybutylsilsesquioxane and the like.

  These light diffusing agents can be used in the range of 0.0005 to 0.2% by mass, based on 100% by mass of the entire resin composition, but in the case of an inorganic light diffusing agent in particular, 0.003 If it is within the range of -0.15% by mass, 0.002 to 0.13% by mass if it is an acrylic light diffusing agent, and 0.0005 to 0.1% by mass if it is a silicon based light diffusing agent, It is highly compatible with transparency and luminescence.

(Iii) Others Antioxidants, lubricants and the like can be appropriately blended according to the materials constituting the resin composition. The specific composition and blending amount can be set as necessary, and are not particularly limited.

[2. Production example]
<Example>
In this example, the additive was mixed with the polycarbonate to form a first mixture, and the first mixture was further mixed with polycarbonate to form a second mixture. The resin composition was shape | molded by the well-known manufacturing method including a heating process and a compression molding process using this 2nd mixture.

  The additive is 2.0% by mass of titanium oxide as a white pigment, 20.0% by mass of polymethylsilsesquioxane as a light diffusing agent, 40.0% by mass of an antioxidant, and 38.0% by weight of a lubricant. It manufactured combining with mass%.

  The first mixture was produced by adding 25 g of the above-described additive to 50 kg of polycarbonate and mixing. The second mixture was produced by blending and mixing 30.0% by mass of the first mixture and 70.0% by mass of polycarbonate.

In the final resin composition, based on 100% by mass of the entire resin composition, 0.0003% by mass of titanium oxide as a white pigment and 0.003% by mass of polymethylsilsesquioxane as a light diffusing agent % By mass, 0.006% by mass of an antioxidant, and 0.0057% by mass of a lubricant.
The average particle size of titanium oxide was 0.2 μm, and the average particle size of polymethylsilsesquioxane was 4.5 μm.

1A and 1B show examples of the shape of the resin composition.
The resin composition 1 has a hemispherical shaped thin plate-like curved surface portion 3 and a flange-like flange portion 5 provided at an end of the outer periphery of the curved surface portion 3. When light is introduced from the surface 5a of the flange 5 opposite to the side connected to the curved surface 3 by the light emitting member 11 such as an LED, the light is diffused in the entire curved surface 3 and light is emitted. The curved surface portion 3 corresponds to the light transmitting portion of the present invention, and the surface 5 a corresponds to the light introducing surface of the present invention.

[3. effect]
(3a) The resin composition manufactured in the said Example shows high transparency. And, when light is introduced, it emits brighter light (surface light emission) as compared with a conventional material showing similar transparency, for example, a base material of acrylic resin or ABS resin and a light diffusing agent. That is, the resin composition mentioned above can be compatible in transparency and high light diffusivity.

  Although the reason why the reflectivity when light is introduced into the resin composition is highly enhanced by simultaneously including the white pigment and the light diffusing agent is not clear, the amount of the light diffusing agent used is reduced by the effect. And can be made more permeable.

(3b) In particular, by using titanium oxide as a white pigment and using a silicon-based light diffusing agent as a light diffusing agent, it is possible to achieve both higher transparency and light diffusivity.
(3c) Since the resin composition is composed mainly of polycarbonate, it is strong and is hard to break, which is convenient.

[4. Other Embodiments]
Although the embodiments of the present invention have been described above, it is needless to say that the present invention is not limited to the above embodiments at all, and may take various forms within the technical scope of the present invention.

  For example, the blending ratio of the white pigment and the light diffusing agent is not particularly limited. If it is desired to further increase the permeability, the proportion of the white pigment or the light diffusing agent may be reduced. Conversely, if it is desired to further enhance the light-emitting property, the proportion of the white pigment or the light diffusing agent may be increased.

  For example, titanium oxide is considered to be used in the range of 0.00005 to 0.01 mass% when the entire resin composition is 100 mass%, but it is more advanced by setting it as 0.0001 mass% or more. Light emission (diffusivity) can be realized, and higher transparency can be realized by being not more than 0.005% by mass, particularly not more than 0.001% by mass.

Moreover, the shape of the resin composition is not limited to the shape of the said embodiment, It can be made into various shapes.
Specifically, at least a part is a constant thickness, and is formed in at least one of a planar shape and a curved shape, and a light transmitting portion having light transparency, and a light transmitting portion And a light introduction surface for introducing light toward the light source.

  That is, when compared with the resin composition 1 of FIG. 1, the curved surface part 3 which is a light emission surface may be a plane. Moreover, a part of light emission surface may be formed as shapes other than a curved surface or a plane, and a pattern or a color may be given. The term "transparency" as used herein may be such that the opposite side can be seen through the light emitting surface such as the curved surface portion 3 or the like. The light introducing surface may be provided at a position where the light can reach the light transmitting portion when light is introduced from the surface. A protrusion or a recess may be formed in a part of a certain thick portion.

  DESCRIPTION OF SYMBOLS 1 ... Resin composition, 3 ... Curved surface part, 5 ... Flange part, 5a ... surface, 11 ... Light emission member

Claims (6)

  A resin composition comprising a white pigment, a light diffusing agent, and a polycarbonate and having light transmittance. The resin composition according to claim 1, wherein
The resin composition, wherein the white pigment comprises at least titanium oxide. The resin composition according to claim 2, wherein
The resin composition in which the said titanium oxide is contained in 0.00005-0.01 mass%. The resin composition according to any one of claims 1 to 3, wherein
The resin composition, wherein the light diffusing agent comprises at least one of an inorganic light diffusing agent, an acrylic light diffusing agent, and a silicon light diffusing agent. The resin composition according to claim 4, wherein
The resin composition in which the said silicon-type light-diffusion agent is contained in the range of 0.0005-0.1 mass%. The resin composition according to any one of claims 1 to 5, wherein
At least a part of a light transmitting portion having a predetermined thickness, at least one of a planar shape and a curved shape, and having light transparency;
And a light introducing surface for introducing light toward the light transmitting portion.

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