JPH0756523B2 - Heat-resistant anti-glare sheet - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-resistant and anti-glare sheet, particularly a light-shielding sheet excellent in heat resistance, which can shield unnecessary external light, improve the contrast of the internal display portion, and adjust the visible angle range. The present invention relates to a heat resistant and antiglare sheet that is useful as a sheet, a filter sheet and the like.

[0002]

2. Description of the Related Art As an anti-glare sheet capable of adjusting a visible angle range with a light-shielding property, a sun shade blind provided on a window is most well known, but it is installed in front of a display body or the like. Known as a transparent thin plastic sheet such as cellulose acetate butyrate (cellulose acetate butyrate) with a minute louver is provided for blocking unnecessary external light and limiting the visible angle. It is said that.

[0003]

The hitherto known antiglare sheet mainly composed of cellulose acetate butyrate has a low heat resistance temperature of 70 to 80 ° C., and when it is heated, it deforms or has a gas having a peculiar offensive odor. Because of the disadvantage that it occurs, there is a disadvantage that if it is installed in front of the display part of the car panel, car audio, cloak, etc., the above-mentioned disadvantages will occur as the temperature inside the car rises. As another transparent material, for example, when using an acrylic resin plate, there is a disadvantage that the surface is covered with white powder during use, and in addition, the coefficient of thermal expansion is large at 14 × 10 ⁻⁵ / ° C. It has the drawback of lacking stability.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a heat-resistant and antiglare sheet which solves the above disadvantages, in which a transparent silicone rubber layer and a colored silicone rubber layer are bonded to each other at their joint surfaces. It is characterized in that they are laminated in an alternating manner and in multiple layers so as to be parallel.

That is, the inventors of the present invention have conducted research on a sheet having excellent heat resistance and antiglare property. As a result, if silicone rubber is used as the base material, it is transparent,
Since it has excellent heat resistance and can be colored arbitrarily by adding pigments, dyes, etc., it is possible to block unnecessary external incident light by stacking this transparent layer and the colored layer in parallel. Yes, and its visible angle is also the transparent layer used here,
It has been found that the layer width can be varied over a wide range by adjusting the layer width of the colored layer, and the present invention has been completed by conducting research on the type of silicone rubber used here, the layering method, the layer width, and the like.

[0006]

A commercially available silicone rubber compound may be used for the transparent silicone rubber layer constituting the heat-resistant and antiglare sheet of the present invention, and a diorganopolyene whose molecular chain end is blocked with a hydroxysilyl group or a vinylsilyl group. Silicone rubber composition generally called Miraburgol consisting of siloxane and organic peroxide, diorganopolysiloxane having at least two vinyl groups bonded to a silicon atom in the molecule, bonded to the silicon atom in the molecule Examples thereof include a so-called addition reaction type organosilicone rubber composition in which an organohydrogenpolysiloxane having at least three hydrogen atoms (≡SiH bonds) and a platinum catalyst are blended.

The colored silicone rubber layer to be laminated with the transparent silicone rubber layer is obtained by coloring the above silicone rubber composition with black, blue, green, yellow, orange, red, purple or other colors. Generally, it may be black such as carbon black or Benkara, or black in which 5 to 10 parts by weight of a red pigment or dye is added to 100 parts by weight of the silicone rubber composition.

The heat-resistant and antiglare sheet of the present invention is obtained by alternately and multiply laminating the transparent silicone rubber layer and the colored silicone rubber layer so that their joint surfaces are parallel to each other. Industrially, a transparent silicone rubber composition and a colored silicone rubber composition are molded into a large number of sheets each having a desired thickness, and then these transparent silicone rubber compositions are formed as shown in FIG. The sheet 1 and the colored silicone rubber sheet 2 are laminated alternately and in multiple layers, and then pressure is applied, and if necessary, heating is performed to form a block body 3 in which these are integrated. It may be made by a method of slicing in a direction perpendicular to the stacking direction such as a line.

The heat-resistant and antiglare sheet of the present invention thus obtained has a transparent silicone rubber layer 4 and a colored silicone rubber layer 5 whose bonding surfaces are parallel to each other, as shown in FIG. In addition, it is laminated alternately and in multiple layers, but since it is made mainly of silicone rubber, it does not undergo thermal deformation or generate decomposition gas even at high temperatures up to 200 ° C. It has excellent physical properties, and since this layer has transparent layers and colored layers that are alternately laminated, it can be used for display devices such as CRTs and LEDs, as well as LCDs, meters, panel board displays, etc. When installed on the front surface of the display, the light rays from the display are blocked by this sheet surface, so that an antiglare effect is given to the operator. The shape and size of this heat-resistant antiglare sheet are arbitrary, but they may be generally the same as those of the display subject to be subjected to antiglare, and this thickness is in the range of visible angle and translucency and for convenience of handling. To 0.15 to 2.5 mm. Further, the width W ₂ of width W ₁ and the colored rubber layer 5 of the above-described transparent rubber layer 4 constituting the sheet intended to transparency and parallel light transmittance of this sheet is determined by the ratio of the W ₁ / W ₂ However, since this visible angle range is determined by the refractive index n of the transparent rubber layer 4, the sheet thickness t, and the width W ₁ of the transparent rubber layer, this W ₁ is 50 μm to 50 μm.
The range is 0.3 mm, preferably 75 μm to 0.2 mm, and W ₂ is 10 μm to 50 μm so as not to cause human visual problems, but it is preferably 15 μm to 30 μm. According to the above, transparency having a maximum of about 85% and a visible angle of 30 to 50 ° can be obtained. In addition, this product can also form an angled colored layer in the sheet by slicing the laminated block at an angle, so that an antiglare sheet having an asymmetric visible angle with respect to the sheet surface can be obtained. This is particularly effective when looking up at a high-altitude display, which can block sunlight from entering and sharpen the internal display.This angle may be set arbitrarily, but it is practical. 3-10 from above
An angle range of ° is preferred.

[0010]

EXAMPLES Next, examples of the present invention will be given. Example 1 A transparent silicone rubber sheet having a thickness of 240 μ is made from a transparent silicone rubber compound: KE164U [trade name of Shin-Etsu Chemical Co., Ltd.], and a silicone rubber compound KE981U [trade name of Shin-Etsu Chemical Co., Ltd.]. A black silicone rubber sheet having a thickness of 40 μ is made from black layer rubber which is uniformly kneaded by adding 5 parts of carbon black to 100 parts, and these are alternately laminated to form a block body having a thickness of 350 mm, and then 180 ° C. After heat-pressing and curing under the condition of 100 kg / cm ² G, the transparent silicone rubber layer and the black silicone rubber layer are alternately laminated in parallel by slicing the sheet in a plane perpendicular to the laminating direction of the sheet. I made a sheet with a thickness of 0.4 mm. This sheet is regular 20
It is made of a flexible elastic elastomer that has a heat resistance of 0 ° C and has a light-shielding rate of 40/240 + 40 × 100 =
14.30%, visible light transmittance 65%, visible angle θ = 1
It was a heat resistant and antiglare sheet of 10 °.

[0011]

The heat-resistant and antiglare sheet of the present invention is mainly composed of silicone rubber, which withstands high temperatures up to 200 ° C. and does not generate thermal deformation or decomposed gas, so that it is an indicator by an incandescent lamp. It becomes an anti-glare sheet with excellent heat resistance that can be installed inside, and when used as a display for in-vehicle parts of automobiles, the effect of the anti-glare sheet is maintained even in an environment where the temperature inside the vehicle is 110 ° C. Since it does not adversely affect other transparent instrument board materials made of acrylic resin etc.,
It can be applied to the field of display bodies and the field of automobiles by a heat source, and since it has an excellent anti-glare effect, if it is installed on the surface of an outdoor display board, it blocks incident light such as sunlight, If the internal display has good contrast and the internal display is a light emitting body such as an LED, the display becomes clearer. Not only is it possible to block unwanted internal light emission at the visible angle, but it can also be widely used in various fields such as blocking unnecessary internal light emission that forms a virtual image on the windshield or side glass. .

[Brief description of drawings]

FIG. 1 is a perspective view showing a method for producing an antiglare sheet according to the present invention.

FIG. 2 illustrates a perspective view of an antiglare sheet of the present invention.

[Explanation of symbols]

 1 Transparent Sheet 2 Colored Sheet 3 Block Body 4 Transparent Layer 5 Colored Layer

Claims (1)

[Claims] 1. A heat-resistant and antiglare sheet comprising a transparent silicone rubber layer and a colored silicone rubber layer, which are laminated alternately and in multiple layers so that their joint surfaces are parallel to each other. .