JPH07266505A - Synthetic resin laminated sheet - Google Patents

Abstract

PURPOSE:To provide a synthetic resin laminated sheet opaque as a whole obtained by mutually laminating synthetic resin layers having different colors, capable of imparting a light surface color by making the mixing amt. of titanium with a surface layer as little as possible and making the effect of the color of a core material layer hard to exert on the surface color. CONSTITUTION:A surface layer 2 composed of a chromatic synthetic resin is integrally laminated to a core material layer composed of a black or blackish gray achromatic opaque synthetic resin low in brightness and the total light transmissivity of the surface layer is set to 2-10%. Even if only a light hue is imparted to the surface layer 2, a phenomenon such that the brightness of the light hue of the surface layer 2 is lowered by the effect of the color of the core material layer is hard to generate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin laminate, and more particularly to a chromatic and opaque synthetic resin laminate.

[0002]

2. Description of the Related Art Opaque synthetic resin plates having no light transmission have a wide range of uses such as personal items such as various containers and furniture fittings, household items, and base materials as signboard materials. When adjusting the transparency of a synthetic resin plate using a thermoplastic synthetic resin, titanium (Ti
Inorganic additives such as O ₂ ) having an excellent light-shielding property are mixed in the synthetic resin, and the transparency decreases as the mixing amount increases. Since titanium is white in itself, it has a property that when used together with pigments of chromatic colors such as blue, red and yellow, it is easy to impart the color of the pigment to the synthetic resin plate.

Therefore, in order to obtain a synthetic resin plate which is thin and opaque among the chromatic color opaque synthetic resin plates which can be used for a wide range of applications as described above, it is necessary to increase the amount of titanium mixed. Although effective, titanium itself is a foreign substance to synthetic resin, so as the content of titanium increases, various types of impact resistance, bendability, machinability, thermoformability of the synthetic resin plate, etc. Physical properties tend to gradually deteriorate. Further, the greater the amount of titanium mixed, the more difficult it is to impart a light chromatic color such as light red, light blue, or light yellow to the synthetic resin plate.

[0004]

On the other hand, the actual Kaihei 2-27
According to Japanese Unexamined Patent Publication No. 332, in order to distinguish the characteristics and applications of the thermoplastic synthetic resin plate from others, the identification layer made of synthetic resin is sandwiched by the surface layers made of synthetic resin on both sides of the identification layer, and the identification layer is formed. There has been proposed an opaque synthetic resin laminated plate which adopts the idea that the color of the is different from that of the surface layer. In this synthetic resin laminated plate, the surface layer is made opaque in order to prevent the color of the identification layer from being projected on the plate surface through the surface layer. Further, in the above publication, if the surface layer is gray, the identification layer is white, if the surface layer is red, the identification layer is green, if the surface layer is blue, the identification layer is yellow, and if the surface layer is red, the identification layer is pale red. It describes an example of a color combination and setting the thickness of the surface layer to 1 mm or more.

By the way, as described at the beginning, in order to obtain a chromatic and opaque synthetic resin plate having a small thickness, it is generally practiced to increase the amount of titanium to be mixed. Also in the synthetic resin laminates described,
It is assumed that the chromatic and opaque surface layer is a synthetic resin layer containing a large amount of titanium. Further, that the chromatic color opaque surface layer is a synthetic resin layer with a large amount of titanium mixed in, in the above example of the color combination of the surface layer and the identification layer,
It can be inferred from the fact that a light color is not selected for the surface layer and a light color that is difficult to project on the surface of the surface layer is selected as the color of the identification layer. That is,
This is because the greater the amount of titanium mixed, the more difficult it is to impart light chromatic colors such as light red, light blue, and light yellow to the synthetic resin plate.

Therefore, the surface layer is made chromatic and opaque by increasing the amount of titanium mixed in the surface layer and making the surface layer a dark color, and the color of the identification layer is covered with the surface layer through the surface layer. As long as the idea proposed in the above publication such as prevention of projection is adopted, it is not possible to avoid deterioration of the physical properties of the entire synthetic resin laminate due to the physical properties of the surface layer containing a large amount of titanium. Moreover, it is not possible to provide a synthetic resin laminate having a light surface color.

On the other hand, in the synthetic resin laminate, it is beneficial to make the core material layer on which the surface layers are laminated black. For example, when manufacturing a synthetic resin plate that reuses plastic waste materials, in order to unify the colors of the waste materials of various colors, carbon is mixed into the waste materials to make them black, and such black synthetic resin layers are used. By stacking a light gray or chromatic surface layer on the core material layer, various colored synthetic resin plates can be obtained even though the waste material is reused.

However, when the core material layer is black, regardless of whether the surface layer is chromatic or achromatic, the black color of the core material layer is projected on the surface of the surface layer depending on its thickness and light transmittance. As a result, the brightness of the plate surface decreases, and it is difficult to obtain a vivid surface color or a light surface color. Therefore, it is conceivable to mix a large amount of titanium into the surface layer to make the surface layer opaque, but doing so is not preferable because the physical properties of the laminated plate deteriorate.
It is not preferable for thinning the surface layer to give a pale color.

The present invention has been made under the above circumstances, and in a synthetic resin laminated plate in which a surface layer is laminated on a core material layer of black or a low brightness achromatic color having a brightness close to that of black, titanium is mixed in the surface layer. It is possible to provide a light-colored surface color by reducing the amount as much as possible, and to provide a synthetic resin laminate that is opaque as a whole so that the color of the core material layer does not affect the surface color. To aim.

[0010]

According to a first aspect of the present invention, there is provided a synthetic resin laminated plate in which a core layer made of an opaque synthetic resin having a low brightness and an achromatic color is laminated with a surface layer made of a chromatic synthetic resin. The total light transmittance of the surface layer is 2 to 10%. Here, the low brightness achromatic color is J
The basic color name of IS Z 8102, "black""darkgray"
Refers to black or blackish gray with lightness equivalent to the color name represented by "gray".

According to a second aspect of the present invention, in the synthetic resin laminated plate according to the first aspect, the surface layer has a thickness of 0.3 to 0.7 mm.

A synthetic resin laminate according to the invention of claim 3 is the same as that of claim 1, wherein the core material layer is a vinyl chloride resin layer and the surface layer is a vinyl chloride resin layer containing 3 to 10 parts of titanium. That is.

According to a fourth aspect of the present invention, in the synthetic resin laminated plate according to any one of the first, second and third aspects, the core material layer is sandwiched between the surface layers on both sides thereof. It is a thing.

According to a fifth aspect of the present invention, in the synthetic resin laminate according to the fourth aspect, the surface layers on both sides of the core material layer are colored in different colors.

[0015]

The synthetic resin laminate according to the first aspect of the invention is
Since the core material layer has a low brightness achromatic color and is opaque, the opacity of the laminate is maintained by the core material layer. Further, since the total light transmittance of the surface layer is a low value of 2 to 10%, even if the core material layer has a low lightness achromatic color, that is, black or blackish gray, the surface of the laminate, that is, the surface layer is The influence of the color of the core layer hardly appears. Therefore,
Even if only a light color is applied to the surface layer, the phenomenon that the lightness of the light color of the surface layer is lowered due to the influence of the color of the core material layer is unlikely to occur. The action of hardly causing such a phenomenon that the lightness of the light color of the surface layer is lowered due to the influence of the color of the core material layer is described in claim 2, claim 3, and claim 4,
The invention described in claim 5 is also provided.

In the synthetic resin laminate according to the second aspect of the present invention, the thickness of the surface layer is regulated to a small value of 0.3 to 0.7 mm, so that the surface layer is thin and the synthetic resin of the surface layer is small. It is easy to produce a pale chromatic color by mixing a pigment into the. Further, since the physical properties of the synthetic resin laminate are mainly due to the physical properties of the core material layer, even if the surface layer has a thin thickness of 0.3 to 0.7 mm, the mechanical properties of the synthetic resin laminate are thereby reduced. There is no loss of physical properties.

Since the surface layer is a vinyl chloride resin layer containing 3 to 10 parts of titanium, the synthetic resin laminate according to the invention of claim 3 is affected by the color of the core material layer due to the light hiding property of titanium. Not only is it hard to appear on the surface of, but the improvement in brightness can be expected due to the pure white color of titanium. Moreover, the impact resistance and the like of the surface layer are not conspicuously deteriorated only by mixing titanium to this extent. Further, since the core material layer and the surface layer are the same vinyl chloride resin layer, the core material layer and the surface layer are firmly integrated, and there is no possibility that the surface layer peels off the core material layer even if engraving or cutting is performed.

Both sides of the synthetic resin laminate according to the invention described in claim 4 or 5 can be used.
In particular, according to the fifth aspect, it is possible to properly use both surfaces of different colors as needed.

[0019]

1 is an explanatory view showing a cross section of a synthetic resin laminate A according to an embodiment of the present invention, in which 1 is a core material layer and 2 and 2 are surface layers provided on both sides of the core material layer 1. The core layer 1 and the surface layers 2 and 2 are integrally laminated by thermocompression molding.

The core material layer 1 is formed of an opaque synthetic resin having a low brightness and achromatic color, and the specific color of the core material layer 1 is JIS.
The basic color name of Z 8102 is black with lightness corresponding to the color name represented by "black". A specific synthetic resin forming the core layer 1 is vinyl chloride resin. That is, the core material layer 1 includes 100 parts of a vinyl chloride resin having an average molecular weight of 600 to 1500, 2.5 parts of a tin stabilizer, 0.7 parts of a lubricant, and 3.0 parts of a plasticizer. The amount of carbon powder that can maintain the opacity of is mixed.

The surface layer 2 is made of a chromatic synthetic resin such as blue, red or yellow. A specific synthetic resin is vinyl chloride resin. That is, the surface layer 2 has an average molecular weight of 60.
2.5 parts of tin stabilizer, 0.7 parts of lubricant, 3.0 parts of plasticizer, and titanium for adjusting transparency, and the amount necessary for coloring, per 100 parts of vinyl chloride resin of 0 to 1500. The pigment or dye is mixed. The amount of titanium mixed is
The physical properties of the surface layer 2 do not deteriorate, and the total light transmittance of the surface layer 2 is 2 to 10%, specifically 3 to 10 parts. When the surface of the surface layer 2 is embossed, light is well diffused on the surface, and the diffusion of the light causes a decrease in the total light transmittance of about 1%. It is preferable to emboss the surface.

In the synthetic resin laminate A of FIG. 1, the synthetic resin having the above-mentioned formulation is roll-kneaded at 160 ° C. for 5 minutes to form thin unit sheets, and the required number of the unit sheets are stacked and hot pressed. Thus, the core material layer 1 and the surface layers 2 and 2 are formed to have a predetermined thickness. Concrete core layer 1
Has a thickness of 1 to 10 mm, and the surface layer has a thickness of 0.3 to 0.7 m.
m.

The synthetic resin laminate A of this example was opaque, and the hue of the chromatic surface layer was hardly black due to the influence of the black color of the core layer 1. The hues of the surface layers 2 and 2 on both sides of the core material layer 1 may be the same or different, but if they are made different, one synthetic resin laminated plate is used as a two-color plate. Because it is possible, it is possible to use it properly according to the purpose and preference. For example, when a box is made of the synthetic resin laminate A having the different color surface layers 2 and 2, the color of the outer surface and the inner surface of the box can be different.

In the synthetic resin laminate A of this embodiment,
Although the color of the core material layer 1 is black with the lightness corresponding to the color name represented by "black" in the basic color name of JIS Z 8102, the color of the core material layer is the basic color name of JIS Z 8102 " It may be blackish gray with a lightness corresponding to the color name represented by "dark gray" or "gray". Further, the surface layer may be laminated and integrated only on one side of the core material layer.

By the way, the transparency of the synthetic resin plate can be expressed by the value of the total light transmittance, and the influence of the color of the core material layer on the surface of the surface layer depends on whether the core material layer is present or not. It can be seen by the hue difference of the plate surface of the surface layer. Therefore, in FIG.
Using the vinyl chloride resin plate (sample of the surface layer) manufactured through the same steps as the surface layer 2 of the synthetic resin laminated plate A described in 1., the relationship between the total light transmittance and the amount of titanium mixed and the thickness was investigated. Further, the hue difference of the surface color of the laminated plate in which the samples of the same surface layer were laminated and integrated with the black core material layer was also investigated.

Table 1 shows a synthetic resin laminated plate of FIG. 1 in which 0.5 mm thick surface layers having different amounts of titanium mixed and a 3 mm opaque core material layer mixed with carbon are laminated and integrated. The measured values of the lightness and the hue difference of the (vinyl chloride resin laminated plate) A sample are shown. A vinyl chloride resin plate containing 4 parts of titanium was used as a standard product, and a Σ-90 type manufactured by Nippon Denshoku Industries Co., Ltd. was used as a measuring machine.

[0027]

[Table 1]

Regarding the samples used for the measurement in Table 1,
A large number of people were asked to judge whether or not the black color of the core material layer 1 had an effect, and when the judgment results were comprehensively evaluated, if the amount of titanium mixed was 3 parts or more, the black color of the core material layer 1 It was found that the surface color equivalent to the surface color of the standard product could be produced without much influence. Looking at this from the actual measurement values in Table 1, the surface color of the sample is about 2 lower in lightness than the standard product, and about 3 in hue difference. If so, the difference is acceptable. And according to the measured value,
The higher the amount of titanium mixed, the higher the brightness than the standard product. It is speculated that this is because the white color of titanium exceeds the effect of the blackness of the core material layer 1.

In FIG. 2, the thickness is 0.3 mm and 0.5 mm.
Regarding the sample of the surface layer 2 of No. 3, the measured values of the amount of titanium mixed and the total light transmittance are shown in a graph. A Σ-90 type manufactured by Nippon Denshoku Industries Co., Ltd. was used as a measuring machine.

From FIG. 2, when the sample thickness is the same, in the range where the amount of titanium is small, the total light transmittance is extremely lowered when the amount of titanium is increased even a little.
It can be seen that if the amount of titanium mixed is the same, the total light transmittance is small even though the thickness is large. And, as the amount of titanium mixed in the surface layer where the influence of the black color of the core material layer 1 hardly appears on the plate surface is 3 parts or more as described above at the thickness of 0.5 mm, the total light transmittance thereof is about 12%, Therefore 1
It can be seen that if the content is 0% or less, the blackness of the core material layer 1 is not affected even if the material has translucency. In this regard, conventionally,
It was said that unless the surface layer was made opaque, the color of the core material layer 1 was mixed with black to give a turbid hue, so the thickness was made 1 to 2 mm to make it opaque. It can be seen that there is no problem in practical use even with a thin surface layer of 0.5 mm. Further, it is understood that the titanium content should be 5 parts even if the thickness of the sample is 0.3 mm.

On the other hand, if the titanium content is increased, the lightness is increased and the total light transmittance is decreased. However, if the titanium content is too high, the mechanical strength of the sheet is lowered, and even a laminated plate is used. Although the mechanical strength is lowered, the mechanical strength is remarkably deteriorated when the mixed amount is more than 10 parts, so it should be suppressed to less than that. At this time, the total light transmittance is about 3% at a thickness of 0.5 mm and about 6% at a thickness of 0.3 mm, as shown in FIG. Further, if the amount of titanium mixed is more than 10 parts, it is difficult to produce a pale color. Therefore, the amount of titanium mixed should be suppressed to 10 parts or less. Further, when the thickness of the surface layer is made thinner than 0.3, in order to prevent the black color of the core material layer from appearing in the surface color, the amount of titanium mixed needs to be more than 10 parts,
It becomes difficult to produce a pale color, and the physical properties are significantly deteriorated. On the other hand, the thickness of the surface layer is preferably 0.7 mm or less, the reason is that the physical properties of the entire synthetic resin laminate is made to have a core material layer, and the influence of the surface layer can be eliminated as much as possible. This is because if the surface layer is made too thick, it is difficult to produce a light surface color. Therefore, the thickness of the surface layer is preferably 0.3 to 0.7 mm. The core material layer may be a layer having functions such as rigidity, heat resistance, impact resistance, and flame retardancy, in addition to the vinyl chloride resin plate having the above general composition.

FIG. 2 shows the synthetic resin laminate A explained in FIG.
FIG. 3 is an explanatory view showing a state in which the surface layer 2 is engraved and the surface layer 2 is partially removed linearly, and FIG. 3 is a state in which the edge portion of the synthetic resin laminate A described in FIG. 1 is obliquely cut. FIG. When the surface layer 2 is removed as shown in FIG. 2,
The black color of the core material layer 1 is exposed at the cutout portion 21 of the surface layer 2. Further, when the edge portion is obliquely cut as shown in FIG. 3, the cut surface 11 of the core material layer 1 is exposed to the front surface. Therefore, for example, by cutting the entire periphery of the laminated plate A, The board surface is edged with black lines, and the characters and patterns engraved or cut and pasted on the area surrounded by the edge stand out and stand out. The synthetic resin laminated plate A can be preferably used as a signboard base material and the like by adopting the above-described processing method.

[0033]

According to the present invention, since the opacity of the laminate itself is maintained by the core material layer, the thickness of the surface layer is 1 mm or less, which is thinner than the conventional one, and the amount of titanium mixed in the surface layer is conventionally. It becomes possible to suppress the deterioration of the physical properties and to produce a light surface color by reducing the amount of the above. Moreover, even though the core material layer is a low-lightness achromatic color such as black or blackish gray, it is unlikely that the brightness of the surface color will decrease due to the influence of the color of the core material layer, so it is not opaque. It is possible to provide a synthetic resin laminated plate having a light surface color even though it has a small amount of titanium and excellent in various physical properties such as impact resistance.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a cross section of a synthetic resin laminate according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a state in which a part of the surface layer of the synthetic resin laminate is removed.

FIG. 3 is an explanatory view showing a state in which an edge portion of a synthetic resin laminated plate is obliquely cut.

FIG. 4 is a table showing the relationship between the amount of titanium mixed and the actual measured value of total light transmittance for the surface layer sample.

[Explanation of symbols]

 A Synthetic resin laminated board 1 Core material layer 2 Surface layer

Front page continuation (72) Inventor Hideki Kitada 2-3-13 Azuchi-cho, Chuo-ku, Osaka Takiron Co., Ltd.

Claims (5)

[Claims] 1. A core material layer made of an opaque synthetic resin having a low lightness achromatic color and a surface layer made of a chromatic color synthetic resin are laminated and integrated, and the surface layer has a total light transmittance of 2 to 10%. A synthetic resin laminated board characterized by the above. 2. The synthetic resin laminate according to claim 1, wherein the surface layer has a thickness of 0.3 to 0.7 mm. 3. The synthetic resin laminate according to claim 1, wherein the core material layer is a vinyl chloride resin layer and the surface layer is a vinyl chloride resin layer containing 3 to 10 parts of titanium. 4. The synthetic resin laminate according to claim 1, wherein the core material layer is sandwiched between the surface layers on both sides of the core material layer. 5. The synthetic resin laminate according to claim 4, wherein the surface layers on both sides of the core material layer are colored in different colors.