JP3144982B2 - Synthetic resin laminate - Google Patents

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 transmittance have a wide range of uses as personal articles such as various containers and furniture fittings, household articles, and base materials as signboard materials. When adjusting the transparency of a synthetic resin plate using a thermoplastic synthetic resin, titanium (Ti) is generally used.
Inorganic additives such as O ₂ ) having excellent light concealing properties have been mixed into synthetic resins, and the greater the amount of such additives, the lower the transparency. Since titanium itself is white, it has a property that it is easy to give the color of the pigment to a synthetic resin plate when used together with a chromatic pigment such as blue, red, and yellow.

Therefore, among the chromatic and opaque synthetic resin plates that can be used for a wide range of applications as described above, in order to obtain a thin and opaque synthetic resin plate, it is necessary to increase the amount of titanium to be mixed. Although effective, titanium itself is a foreign substance to the synthetic resin, so as the amount of the mixture increases, various properties such as impact resistance, bending property, cutting workability, and thermoformability of the synthetic resin plate are increased. Physical properties tend to be gradually impaired. Also, as the amount of titanium mixed in increases, it tends to be difficult to apply a light chromatic color such as light red, light blue or light yellow to the synthetic resin plate.

[0004]

Problems to be Solved by the Invention On the other hand, Japanese Utility Model Application Laid-Open No. 2-27.
According to JP-A-332-332, in order to be able to distinguish the characteristics and use of the thermoplastic synthetic resin plate from others, an identification layer made of a synthetic resin is sandwiched by a surface layer made of a synthetic resin on both sides thereof, and an identification layer is formed. There has been proposed an opaque synthetic resin laminate that adopts the idea of making the color of the surface different from the color of the surface layer. In this synthetic resin laminate, the surface layer is made opaque in order to prevent the color of the identification layer from being projected onto the plate surface through the surface layer. In addition, the above publication discloses that the discriminating layer is white if the surface layer is gray, the discriminating layer is green if the surface layer is red, the discriminating layer is yellow if the surface layer is blue, and the discriminating layer is pale red if the surface layer is red. It describes an example of a combination of colors, and describes that the thickness of a surface layer is 1 mm or more.

As described at the beginning, it is generally practiced to increase the amount of titanium mixed in order to obtain a chromatic, opaque, thin synthetic resin plate. Also in the described synthetic resin laminate,
The opaque chromatic surface layer is assumed to be a synthetic resin layer containing a large amount of titanium. Further, that the opaque chromatic surface layer is a synthetic resin layer having a large amount of titanium mixed therein, in the above-described example of the combination of colors 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 that 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 more the amount of titanium mixed in, the more difficult it becomes to impart a light chromatic color such as light red, light blue, or light yellow to the synthetic resin plate.

Accordingly, the surface layer is made chromatic and opaque by increasing the amount of titanium mixed in the surface layer and making the surface layer darker, and the discriminating layer is covered with such a surface layer, and the color of the discriminating layer is applied to the plate surface through the surface layer. As long as adopting the idea proposed in the above publication, such as preventing projection, the physical properties of the entire synthetic resin laminate cannot be avoided due to the physical properties of the surface layer with a large amount of titanium mixed in, Further, a synthetic resin laminate having a light surface color cannot be provided.

On the other hand, in a synthetic resin laminate, it is useful to make the core layer on which the surface layer is laminated black. For example, in the case of manufacturing a synthetic resin plate made of recycled plastic waste material, carbon is mixed into the waste material to blacken it in order to unify the colors of the waste materials of various colors, and such a black synthetic resin layer is formed. If a light gray or chromatic surface layer is laminated thereon as the core layer, various colored synthetic resin plates can be obtained while reusing waste materials.

However, when the core layer is black, regardless of whether the surface layer is chromatic or achromatic, the black of the core layer is projected onto the plate surface of the surface layer depending on the thickness and light transmittance. As a result, the brightness of the plate surface is reduced, and it is difficult to obtain a bright surface color or a pale surface color. Therefore, it is conceivable to mix a large amount of titanium in the surface layer to make the surface layer opaque, but this is not preferable because the physical properties of the laminate are reduced.
It is not preferable in lightening the surface layer to give a pale color.

The present invention has been made under the above circumstances, and in a synthetic resin laminate having a surface layer laminated on a core layer of black or a low-lightness achromatic color having a lightness close to black, mixing of titanium in the surface layer It is an object of the present invention to provide an overall opaque synthetic resin laminate in which a light surface color can be imparted by minimizing the amount, and the surface color is hardly influenced by the color of the core material layer. Aim.

[0010]

According to a first aspect of the present invention, there is provided a synthetic resin laminate according to the first aspect of the present invention, wherein a core material layer made of a low-brightness achromatic opaque vinyl chloride resin contains 3 to 10 parts of titanium oxide in a chromatic color. The surface layer made of vinyl chloride resin is laminated and integrated, and the surface layer has a thickness of 0.3 to 0.7 mm and a total light transmittance of 2 to 10%. Here, the low brightness achromatic color is a basic color name of JIS Z8102,
It refers to black or dark gray with lightness corresponding to the color names represented by “black”, “dark gray”, and “gray”.

[0011]

[0012]

According to a second aspect of the present invention, there is provided the synthetic resin laminate according to the first aspect, wherein the core material layer is sandwiched between the surface layers on both sides thereof.

[0014]

[0015]

The synthetic resin laminate according to the first aspect of the present invention
Since the core material layer is achromatic and opaque with low brightness, the opacity of the laminate is maintained by this 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 is a low-lightness achromatic color, that is, black or blackish gray, the surface of the laminated plate, that is, the surface of the surface layer, The effect of the color of the core material layer hardly appears. Therefore,
Even if only a light color is given to the surface layer, the phenomenon that the lightness of the light color of the surface layer is reduced by the influence of the color of the core material layer hardly occurs.

Further, since the thickness of the surface layer is set to a small value of 0.3 to 0.7 mm, the thickness of the surface layer is thin, and a light chromatic color is obtained by mixing a pigment into the vinyl chloride resin of the surface layer. Easy to put out. In addition, since the physical properties of the synthetic resin laminate mainly depend on the physical properties of the core material layer, even if the surface layer has a small thickness of 0.3 to 0.7 mm, the mechanical properties of the synthetic resin laminate can be reduced. The physical properties are not impaired.

Further, since the surface layer is a vinyl chloride resin layer containing 3 to 10 parts of titanium, the influence of the color of the core material layer on the surface of the laminated board is not easily caused by the light concealing property of titanium. Improvement in lightness can be expected by pure white. Furthermore, the impact resistance and the like of the surface layer are not remarkably reduced only by mixing titanium to this extent. Further, since the core material layer and the surface layer are the same vinyl chloride resin layer, both are firmly integrated, and there is no possibility that the core material layer will be peeled off from the surface layer even when engraving or cutting.

The synthetic resin laminate according to the second aspect of the invention can be used on both sides.

[0019]

1 is an explanatory view showing a cross section of a synthetic resin laminate A according to an embodiment of the present invention, wherein 1 is a core material layer, and 2 and 2 are surface layers provided on both sides of the core material layer 1. FIG. The core layer 1 and the surface layers 2 and 2 are laminated and integrated by hot pressing.

The core layer 1 is made of a low-brightness achromatic opaque synthetic resin. The specific color of the core layer 1 is JIS.
Z8102 is a black color of lightness corresponding to the color name represented by "black" in the basic color name of Z8102. Further, a specific synthetic resin forming the core material layer 1 is a vinyl chloride resin. That is, the core layer 1 is composed of 2.5 parts of a tin-based stabilizer, 0.7 parts of a lubricant, 3.0 parts of a plasticizer, and 100 parts of a vinyl chloride resin having an average molecular weight of 600 to 1500. The carbon powder is mixed in such an amount that the opacity of the carbon powder can be maintained.

The surface layer 2 is formed of a chromatic synthetic resin such as blue, red and yellow. A specific synthetic resin is a vinyl chloride resin. That is, the surface layer 2 has an average molecular weight of 60
2.5 parts of a tin-based stabilizer, 0.7 parts of a lubricant, 3.0 parts of a plasticizer, titanium for adjusting transparency, and the amount required for coloring based on 100 parts of a vinyl chloride resin of 0 to 1500. Pigment or dye is mixed. The amount of titanium
The amount is such that 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. If the surface of the surface layer 2 is embossed, the light diffuses well on the surface, and the diffusion causes a decrease in the total light transmittance of about 1%. Preferably, the surface is embossed.

The synthetic resin laminate A shown in FIG. 1 is roll-kneaded at 160 ° C. for 5 minutes with a synthetic resin having the above-described formula to form a thin unit sheet, and a required number of such unit sheets are stacked and hot-pressed. Thus, the core material layer 1 and the surface layers 2 and 2 are formed to a predetermined thickness. Specific core material layer 1
Has a thickness of 1 to 10 mm and a surface layer of 0.3 to 0.7 m
m.

The synthetic resin laminate A of this embodiment was opaque, and the hues of the chromatic surface layer were hardly blackish due to 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 colors, but if different colors are used, one synthetic resin laminate is used as a two-color plate. Since it can be used, it can be used properly according to the purpose of use and preference. For example, when a box is manufactured using a synthetic resin laminate A having different color surface layers 2 and 2, the outer surface and the inner surface of the box can have different colors.

In the synthetic resin laminate A of this embodiment,
Although the color of the core material layer 1 is black with 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 color may be dark 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.

Incidentally, the transparency of the synthetic resin plate can be represented by the value of the total light transmittance, and the effect of the color of the core layer on the surface of the surface layer depends on whether the core layer is provided or not. It can be seen from the color difference of the surface of the surface layer. Therefore, FIG.
Using a vinyl chloride resin plate (sample of the surface layer) manufactured through the same process as the surface layer 2 of the synthetic resin laminate A described in the above section, 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 was also investigated for a laminate in which the same surface layer sample was laminated and integrated on a black core layer.

Table 1 shows the synthetic resin laminate of FIG. 1 obtained by laminating and integrating each surface layer having a thickness of 0.5 mm with varied amounts of titanium and a core material layer of 3 mm opaque by mixing carbon. (Vinyl chloride resin laminate) The measured values of the brightness and the hue difference of the sample A were shown. Note that a vinyl chloride resin plate containing 4 parts of titanium was used as a standard product, and a Σ-90 model manufactured by Nippon Denshoku Industries Co., Ltd. was used as a measuring device.

[0027]

[Table 1]

For the samples used for the measurements in Table 1,
A large number of persons were asked to determine whether or not the black color of the core layer 1 had an effect. The comprehensive evaluation of the results showed that if the amount of titanium mixed was 3 parts or more, the black color of the core layer 1 was It was found that there was not much influence and the surface color equivalent to the surface color of the standard product could be obtained. Looking at this by actual measurement values in Table 1, the surface color of the sample is about 2 lower in lightness and about 3 in hue difference compared to the standard product. It turns out that this is an acceptable difference. And according to the measured values,
As the amount of titanium mixed in increases, the brightness becomes higher than that of the standard product. This is presumed to be the result of the fact that the white color due to titanium exceeds the effect of the blackness of the core material layer 1.

FIG. 2 shows that the thickness is 0.3 mm and 0.5 mm.
For the sample of the surface layer 2, the measured values of the amount of titanium mixed and the total light transmittance are shown in a graph. In addition, Σ-90 type manufactured by Nippon Denshoku Industries Co., Ltd. was used as a measuring instrument.

From FIG. 2, it can be seen from FIG. 2 that if the thickness of the sample is the same, in the range where the amount of titanium contamination is small, even if the amount of titanium contamination increases even slightly, the total light transmittance is extremely lowered.
It can be seen that if the amount of titanium mixed is the same, the total light transmittance is small although the thickness is large. Then, as described above, the amount of titanium mixed in the surface layer where the black color of the core material layer 1 hardly appears on the plate surface is 3 parts or more as described above, so that the total light transmittance is about 12%. Therefore 1
If it is 0% or less, even if it has translucency, it is understood that it is not affected by the black color of the core material layer 1. In this regard, in the past,
If the surface layer was not made opaque, it would be mixed with black due to the influence of the core material layer 1 to give a cloudy hue. Therefore, the thickness was made 1 to 2 mm to make the surface opaque. It can be seen that there is no problem in actual use even with a thin surface layer of 0.5 mm. Also, it can be seen that even if the thickness of the sample is 0.3 mm, the amount of titanium to be mixed should be 5 parts.

On the other hand, if the amount of titanium is increased, the lightness is increased and the total light transmittance is reduced. However, if the amount of titanium is too large, the mechanical strength of the sheet is reduced. The mechanical strength is reduced, but if the amount is more than 10 parts, the mechanical strength is remarkably deteriorated. The total light transmittance at this time is about 3% for a thickness of 0.5 mm and about 6% for a thickness of 0.3 mm from FIG. If the amount of titanium is more than 10 parts, it is difficult to obtain a light color. Therefore, the amount of titanium should be kept to 10 parts or less. Further, when the thickness of the surface layer is smaller than 0.3, in order to prevent the influence of the black of the core layer on the surface color, it is necessary to increase the amount of titanium mixed in more than 10 parts.
It becomes difficult to produce a pale color, and the physical properties are significantly reduced. On the other hand, it is preferable that the thickness of the surface layer be 0.7 mm or less, because the physical properties of the entire synthetic resin laminate are given to the core material layer and the influence of the surface layer is eliminated as much as possible. This is because if the thickness of the surface layer is too large, it is difficult to produce a pale color on the surface. 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 described 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. FIG. 3 is a state in which the edge of the synthetic resin laminate A described in FIG. FIG. When the surface layer 2 is removed as shown in FIG.
The black color of the core material layer 1 is exposed in the cutout portion 21 of the surface layer 2. When the edge is cut obliquely as shown in FIG. 3, the cut surface 11 of the core material layer 1 is exposed to the front. For example, by cutting the entire periphery of the laminate A, The board surface is bordered by black lines, and characters and designs engraved or cut and pasted in the area surrounded by the border come to stand out. The synthetic resin laminate A can be preferably used as a base material for a signboard by employing the processing method as described above.

[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 reduced to 1 mm or less, which is thinner than the conventional one, and the amount of titanium mixed in the surface layer is reduced. Thus, it is possible to suppress the deterioration of the physical properties and to obtain a light surface color. Moreover, despite the fact that the core layer is an achromatic color with low brightness such as black or blackish gray, it is unlikely that the brightness of the surface color will be reduced by the effect of the color of the core layer, so it is opaque. It is possible to provide a synthetic resin laminate having a surface color of a light color while having a small amount of titanium and excellent in various physical properties such as impact resistance.

[Brief description of the 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 where a part of a surface layer of a synthetic resin laminate is removed.

FIG. 3 is an explanatory view showing a state where an edge portion of the synthetic resin laminate is cut obliquely.

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

[Explanation of symbols]

 A synthetic resin laminate 1 core material layer 2 surface layer

────────────────────────────────────────────────── ─── Continuation of the front page Examiner Hiroaki Hirai (56) References JP-A-4-80032 (JP, A) JP-A-5-16313 (JP, A) JP-A-63-220421 (JP, A) Kaihei 6-297631 (JP, A) Japanese Utility Model Showa 58-45041 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B32B 1/00-35/00

Claims (2)

(57) [Claims] 1. A surface layer made of a chromatic vinyl chloride resin containing 3 to 10 parts of titanium oxide is laminated and integrated on a core material layer made of a low-brightness achromatic opaque vinyl chloride resin. An opaque synthetic resin laminate having a thickness of 0.3 to 0.7 mm and a total light transmittance of 2 to 10%. 2. The synthetic resin laminate according to claim 1, wherein the core material layer is sandwiched between surface layers on both sides thereof.