WO2004000521A1

WO2004000521A1 - Process for producing artificial marble having both granular pattern and stripe pattern

Info

Publication number: WO2004000521A1
Application number: PCT/JP2003/007595
Authority: WO
Inventors: Masaaki Shibazaki; Kaori Fujita
Original assignee: Du Pont-Mrc Co., Ltd.
Priority date: 2002-06-24
Filing date: 2003-06-16
Publication date: 2003-12-31
Also published as: JP2004025538A

Abstract

A process for producing an artificial marble having both granular pattern and stripe pattern, comprising the steps of casting a hardenable composition (A) containing 0.5 to 30 wt.% of resin particles of 0.1 to 5.0 mm diameter (2) into a molding cell; superimposing in layered form at least one layer of a hardenable composition (B) of different color (3) on the cast hardenable composition (A) (2); moving a pectinate member (1) in the laminated hardenable composition (A) (2) and hardenable composition (B) (3) while keeping contact of the teeth of the pectinate member (1) with the bottom surface of the molding cell; and hardening the compositions.

Description

Specification

Method for producing artificial marble having both grain pattern and stripe pattern

Technical field

The present invention relates to a method for producing artificial marble having both grain patterns and stripe patterns. Background art

Conventionally, artificial marble has been used as a component of, for example, a counter of a wash basin or a table top. This artificial marble is usually produced by curing a curable composition. As a method of producing artificial marble having a pattern on the surface, a method of mixing a different color synthetic resin material when injecting a liquid resin into a molding cell is disclosed in Japanese Patent Publication No. 59-15668, It is described in, for example, Japanese Unexamined Patent Publication No. 1-3117723. However, these methods have a problem in that the appearance of the pattern is lacking in reproducibility. In addition, artificial marble is often used by cutting the surface, but this cutting may cause the pattern to disappear or change significantly. Furthermore, when a different material is used for the appearance of the pattern, the difference in the curing speed and the difference in the physical properties between the materials is likely to occur. May decrease.

Japanese Patent Application Laid-Open No. H10-1288771 discloses a method of manufacturing artificial marble by laminating two or more layers of liquid resins of different colors, moving a comb-shaped member in a molding cell, and then curing. Is described. According to this method, a stripe pattern having a sharp appearance can be easily formed, and the pattern can be easily controlled. Japanese Patent Application Laid-Open No. H10-3238488 discloses a comb-shaped member in which one or more layers of liquid resin of different colors are laminated on a layer of liquid resin in which a colorant is unevenly dispersed. A method for producing an artificial marble by moving the steel in a molding cell and then hardening is described. According to this method, it is possible to form a striped pattern having the appearance of natural wood or natural marble, which has a subtle hue and is rich in texture and depth, and the pattern can be easily controlled. In addition, these methods Man-made marble is superior in appearance to natural wood-like materials and other natural marbles. Disclosure of the invention

The present invention has been made in order to easily and satisfactorily produce an artificial marble having an appearance that is more excellent than that of the above-mentioned conventional technology, for example, having a more luxurious granite tone.

That is, an object of the present invention is to provide a three-dimensional appearance and texture of natural granite, a deep color pattern, a luxurious feeling, an appearance having a combination of grain pattern and stripe pattern, and these patterns can be formed. It is an object of the present invention to provide a method for producing artificial marble, in which the production of artificial marble is easy.

Another object of the present invention is to provide a method for producing artificial marble that can be formed continuously in the thickness direction and can exhibit a stripe pattern that does not disappear even when the surface is cut.

The present invention relates to a method for injecting a curable composition (A) containing 0.5 to 30% by mass of resin particles having a diameter of 0.1 to 5.0 mm into a molding cell, and injecting the curable composition. The curable composition (A) is obtained by laminating one or more layers of the curable composition (B) of a different color on (A), and laminating a comb-like member while bringing its teeth into contact with the bottom surface of the molding cell. ) And (B) is a method for producing an artificial marble having both a grain pattern and a stripe pattern having a step of hardening after moving through the inside. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic view illustrating an example of a step of moving a comb-shaped member in the present invention. FIG. 2 is a schematic diagram illustrating an example of a comb-shaped member used in the present effort.

FIG. 3 is a perspective view showing the pan-shaped container used in the example of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

In the method of the present invention, a plurality of curable compositions serving as raw materials for artificial marble are used. The curable composition (A), which is injected first and forms the bottom layer, is a significant product base. It has the following color tone. This curable yarn composition (A) contains 0.5 to 30% by mass of resin particles having a diameter of 0.1 to 5.0 mm based on the mass of the curable composition (A).

The composition of the resin particles is not particularly limited, but is preferably substantially the same as the composition of the portion other than the resin particles in the curable composition (A). A typical example is a syrup, which is a mixture of a monomer such as methacrylic acid ester and a polymer thereof, and a filler, a coloring agent, a curing initiator, etc., and the mixture is cured. Can be The amount of the syrup constituting the resin particles is preferably 20 to 60% by mass based on the mass of the resin particles. Further, the amount of the filler constituting the resin particles is preferably 40 to 80% by mass based on the mass of the resin particles.

Examples of the filler include an inorganic filler such as aluminum hydroxide, magnesium hydroxide, and calcium hydroxide, and an organic filler such as wood flour. Further, it is preferable that the particles are colored. Examples of the coloring agent used for this purpose include, for example, inorganic pigments such as titanium oxide, zinc sulfide, barium sulfate, iron oxide, carbon black, red iron, red, cadmium red, cobalt blue, and cobalt purple; and phthalocyanine and azo-based pigments. And triphenyl methane-based, quinoline-based organic pigments. In addition to these, various components conventionally known as additive components of artificial marble, for example, dyes, ultraviolet absorbers, flame retardants, release agents, fluidizers, thickeners, polymerization inhibitors, acids It is also possible to add an inhibitor.

A preferred example of the method for producing the resin particles is a method in which a composition comprising these components is cured and then the hardened material is ground. Examples of the grinding means include a ball mill, a rod mill, a tower-type grinder, a vibration mill, a mouth mill, a brake crusher, a roll crusher, and a hammer mill. These crushing means may be used in combination.

The diameter of the resin particles is in the range of 0.1 to 5.0 mm. If the diameter is set to 0.1 mm or more, satisfactory aesthetic properties can be obtained in artificial marble, which is a polymerized and cured composition. However, when the diameter is larger than 5.0 mm, for example, when resin particles having a diameter of about 5.0 mm to 15.0 mm are present, impact resistance, heat crack resistance, etc. tend to be deteriorated. . The diameter of the resin particles should be in the range of 0.1 to 3.0 mm. Preferably, there is.

In the case where resin particles are produced by pulverizing the cured composition, it is also preferable that the particles are classified after fine powdering, and then divided into fine particles and coarse particles. By blending the particles of each color tone into fine particles and coarse particles, a deeper color tone and appearance can be obtained. Further, by changing the mixing ratio of the two, it becomes easy to adjust the appearance of the artificial marble.

The content of the resin particles in the curable composition (A) is in the range of 0.5 to 30% by mass based on the mass of the curable composition (A). This amount is 0.5 mass. If the ratio is less than / ₀ , the grain pattern is too small, which is not preferable in appearance. Also, when the content exceeds 30% by mass, appearance is not preferable, and characteristics such as impact resistance and heat crack resistance tend to deteriorate. A more preferred content is 3 to 20% by mass.

The composition of the portion other than the resin particles in the curable composition (A) is not particularly limited. A typical example is a syrup, which is a mixture of a monomer such as methacrylic acid ester and its polymer, and a filler, a colorant, a curing initiator, and the like added thereto. The amount of the syrup is preferably 30 to 70% by mass based on the mass of the portion other than the resin particles in the curable composition (A). Further, the amount of the filler is preferably 30 to 70% by mass based on the mass of the portion other than the resin particles in the curable composition (A).

Examples of the filler include inorganic fillers such as hydroxyaluminum, magnesium hydroxide, calcium hydroxide, and organic fillers such as wood flour. Examples of the colorant include white titanium oxide and zinc sulfide, yellow iron oxide yellow, black iron oxide black, red iron oxide red, blue ultramarine blue and phthalocyan blue. Examples of the curing catalyst include tertiary butyl peroxymaleic acid, benzoyl peroxide, tamen hydroperoxide, tertiary butyl phenol dropperoxide, tertiary butyl lauroyl, and azobisisobutyrate. Can be In addition to these, various components conventionally known as additive components of artificial marble, for example, dyes, ultraviolet absorbers, flame retardants, release agents, fluidizing agents, thickeners, polymerization inhibitors, acids An anti-diding agent and the like can also be added.

A preferred example of the curable composition (A) is a hardening composition in which a colorant is dispersed non-uniformly. Such heterogeneous dispersion compositions may, for example, be deposited in the composition. It can be produced by adding a coloring agent and stirring insufficiently. The degree of uneven dispersion of the colorant can be changed according to the appearance requirements of each product, but at least the colorant is uniformly dispersed in the curable composition (A) visually. It just needs to be able to recognize that it is not. When such a heterogeneous dispersion composition is used, the quality of the obtained artificial marble is improved, and a more natural appearance can be obtained. The injection of the heterogeneous dispersion composition into the molding cell can be carried out by various methods, but the heterogeneous dispersion composition imparts a unidirectional flow direction to the flow pattern of the composition having the superiority of the product. It is preferable that it is performed in the same manner as described above, and coincides with the direction of movement of the comb-like member described later. As a preferable example of the method for injecting the heterogeneous dispersion composition, a method in which the supply container for the heterogeneous dispersion composition is relatively moved in one direction with respect to the molding cell and injects the same.

The composition of the curable composition (B) used in the present invention is not particularly limited. A typical example is a syrup which is a mixture of a monomer such as methacrylic acid ester and a polymer thereof, and a filler, a colorant, a curing initiator and the like added thereto. The amount of the syrup is preferably from 20 to 60% by mass based on the mass of the curable composition (B). Further, the amount of the filler is preferably 40 to 80% by mass based on the mass of the curable composition (B). As specific examples of the filler, the colorant, the curing catalyst, and other various components, the same as the specific examples described above for the curable composition (A) can be given.

The curable composition (B) may or may not contain resin particles. When resin particles are contained, the diameter of the resin particles is preferably not more than 5.0 mm. If this diameter is greater than 5. O mm, for example 5. Ο πιπ! When resin particles having a diameter of about 15 mm are present, impact resistance, heat crack resistance, and the like tend to deteriorate.

When the curable composition (B) contains resin particles, the content is preferably 30% by mass or less based on the mass of the curable composition (B). If this amount exceeds 30% by mass, the properties such as impact resistance and heat crack resistance tend to deteriorate. A more preferable content is 20% by mass or less.

In the present invention, for example, first, a curable composition (A) containing resin particles is injected into a molding cell to form a lowermost layer. Then, the injected curable composition On top of (A), a curable composition (B) of a different color is layered. In this lamination, it is preferable to inject the upper layer curable composition (B) so that the interface with the lower layer curable composition (A) is not so disturbed. The curable composition having a different color referred to in the present invention refers to a curable composition having a different color tone, that is, a curable composition having at least one of different coloring concentrations and hues. In the method of the present invention, at least two types of curable compositions having different colors are used. That is, three or more different-color curable compositions (A) and (B) may be laminated in three or more layers.

It is preferable that the curable compositions (A) and (B) are laminated with a uniform thickness over the entire surface in the cell in order to control the appearance of a power pattern. However, even if the layer thickness is partially uneven, this does not directly affect the appearance of stripe patterns and grain patterns. The lamination thickness of the curable compositions (A) and (B) is not particularly limited, but the thickness of each layer is preferably about 2 to 20 mm. In particular, if the thickness of the lower layer of the curable composition (A) is appropriately reduced, when the teeth of the comb-shaped member are moved while being in contact with the bottom surface of the molding cell, the upper layer of the curable composition ( B) is preferred because it is easier to reach the bottom of the cell. Also, it is preferable to appropriately increase the thickness of the lower layer of the curable composition (A) because the pattern is less likely to be disturbed and the control is easy, and the limitation on the thickness of the artificial marble is eased.

With regard to the curable compositions (A) and (B), it is the viscosity of the curable composition that has a particularly great influence on the method of the present invention. One preferable example of the viscosity is a value in the range of 0.3 to 5.0 Pa · s. By setting the viscosity at an appropriate value, it becomes easy to control the uniform dispersion of the resin particles and the appearance of the stripe pattern, and it is also possible to prevent sedimentation of additives such as resin particles, fillers, and coloring agents. .

In the present invention, after the curable composition (B) is layered on the curable composition (A) in one or more layers, the comb-like member is cured while the teeth thereof are brought into contact with the bottom surface of the molding cell. The compositions (A) and (B) are moved in a carded fashion. When the comb-like member is moved in the curable compositions (A) and (B) in this manner, the exaggerated expression indicates that the curable composition (A) is present at the mark where the teeth of the comb-like member have passed. Displaced depressions are formed, into which the different-color curable composition (B) of the upper layer flows. This allows the comb The upper layer of the curable composition (B) of a different color penetrates the traces of the teeth of the comb-shaped member up to the bottom of the cell. Will be formed.

FIG. 1 is a schematic diagram showing an example of the step of moving the comb-like member in the curable composition as described above. In the example shown in FIG. 1, a curable composition (A) 2 containing resin particles is formed as a lower layer, and a curable composition (B) 3 of a different color is formed on the lower layer to form a laminate. The teeth of the comb-shaped member 1 are immersed in both layers to the bottom surface of the lower layer, and the curable composition (B) 3 of the upper layer having a different color flows into the traces of the teeth so as to flow to the bottom surface. Is moving.

In the method of the present invention, it is necessary that the curable composition (B) of a different color in the upper layer flows into the trace of passage of the teeth of the comb-like member, and only the curable composition (A) in the lower layer flows there. The stripe pattern is not formed if it is inserted. Therefore, it is necessary that a depression can be formed in the trace of the passage of the tooth. Various factors such as the viscosity of the curable compositions (A) and (B), the moving speed of the comb-like member, the shape of the comb-like member, and the like are interrelated to the occurrence of the depression. Therefore, the conditions for successfully generating the depression are not determined uniformly, but may be determined as appropriate according to various conditions.

The moving speed of the teeth of the comb member is important in relation to the viscosity of the curable compositions (A) and (B). If the moving speed of the teeth is too slow, no depression can be formed in the trace of the passage of the teeth, so that the upper layer of the different-color curable yarn (B) cannot reach the bottom of the cell, and a stripe pattern cannot be formed. Generally, the moving speed of the comb-like member is preferably about 1 to 10 cmZ seconds. In general, a comb-shaped member is moved linearly to form a linear stripe pattern, but this can be meandered and moved to form a meandering stripe pattern. The comb member can also be moved multiple times. This is a preferred embodiment of the method of the present invention, because the stripe pattern fluctuates and changes in spacing when moved a plurality of times, and an artificial marble with a natural taste is obtained.

As the comb-shaped member used in the present invention, a member made of a material that is inert to the curable composition and does not exhibit adhesiveness is suitable. Specific examples of such a material include a metal such as aluminum, an organic material coated with polytetrafluoroethylene, and the like. '· FIG. 2 is a schematic diagram illustrating an example of a comb-shaped member used in the present invention. The comb-shaped member 4 shown in FIG. 2 includes a plurality of strip-shaped teeth 4 arranged in a line in parallel at desired intervals, and a portion connecting one end of the plurality of teeth 4.

The length of the teeth of the comb-like member is sufficiently longer than the total number of layers of the entire curable composition so as not to cause unnecessary disturbance of the upper curable composition (B). Is appropriate. The width of the teeth (the length perpendicular to the direction of movement of the teeth) is preferably l to 20 mm. The width of the teeth does not correspond to the width of the stripe to be formed, but does affect it. The thickness of the teeth (the length in the direction of movement of the teeth) may be any thickness that maintains the mechanical strength of the teeth, and does not significantly affect the formation of the stripe pattern. The cross-sectional shape of the tooth is not very streamlined, and a square shape that generates turbulence in the curable composition in the trace of the passage of the tooth is appropriate. Further, the shape of the tip of the tooth preferably has a flat surface so as to be able to adhere to the bottom surface of the molding cell. If there is no need to move many times, the number of teeth may be one, and an appropriate number of teeth may be selected according to a desired stripe pattern.

In the present invention, the curable compositions (A) and (B) are cured after the comb-shaped member is moved to form a stripe pattern on the bottom surface of the layer of the curable composition (A). Then, the hard marriage product is taken out of the molding cell to obtain an artificial marble. The artificial marble has a stripe pattern on the surface in contact with the cell bottom. Since this stripe pattern is formed based on fluid mixing of curable compositions of different colors, it is a stripe pattern of a line having a natural fluctuation different from that drawn by a rule. Furthermore, according to the present invention, due to the combination of the color and pattern of the stripe and the color and size of the resin particles contained in the curable composition (A), An entirely new look can be provided.

In the above description, the embodiment based on the batch-type casting method has been mainly described, but the method based on the continuous-type cast molding method is also possible. In the continuous cast molding method, for example, a stainless steel belt moving as a cell and a frame for damping a curable composition made of rubber, resin or the like provided on both sides thereof are used. That is, in the present invention, the comb-shaped member is stationary and fixed, and the comb-shaped member is moved in the curable composition by moving the stainless steel belt side (molding cell side). You may make it move oppositely.

By grinding the surface of the artificial marble thus obtained, it is possible to obtain a granite-like appearance that is more taller and of higher commercial value. Although the depth of the surface grinding varies depending on the size of the resin particles added, it is preferable to perform the grinding at a depth equal to or larger than the radius of the largest particle.

The artificial marble obtained according to the present invention can be used for various purposes, such as kitchen tops, washstands, passtabs, tables, wall materials, furniture, and interior accessories in houses.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited thereto. In the following examples, 80% by mass of methyl methacrylate and 20% by mass of methyl methacrylate polymer were contained in the syrup. A mixture of / ₀ was used.

[Production Example 1: Production of white 1 resin particles (Pl, P2)]

The components of Formulation 1 shown in Table 1 were mixed and vacuum degassed while stirring. This vacuum degassed mixture was poured into a mold (heated to 28 ° C) covered with a PVA (polyvinyl alcohol) film, and a PVA film was adhered thereon. Further, a urethane mat was placed thereon, kept warm, and left for a while to obtain a sheet-like cured product. The cured product is cut into small pieces with a cutting machine, ground with a hammer mill, and separated by a sieve to obtain white 1-grease particles (P 1) having a diameter of more than 0.5 mm and not more than 1.7 mm, One white resin particle (P2) having a diameter of 1 mm or more and 0.5 mm or less was obtained.

[Production Example 2: Production of white 2 resin particles (P3, P4)]

White resin particles (P 3) having a diameter of 1.7 mm or more and 3.0 mm or less, and a diameter of 0.1 mm or more and 0.5 mm or less in the same manner as in Production Example 1 except for using each component of Formulation 2 shown in Table 1. Thus, white 2 resin particles (P4) having a size of not more than mm were obtained.

[Production Example 3: Production of black resin particles (P 5)]

Black resin particles (P5) having a diameter of 0.1 mm or more and 0.5 mm or less were obtained in the same manner as in Production Example 1 except that each component of Formulation 3 shown in Table 1 was used.

[Production Example 4: Production of brown resin particles (P 6)]

Except that each component of Formulation 4 shown in Table 1 was used, the diameter was the same as in Production Example 1. Brown resin particles (P 6) having a size of 0.111! 1111 or more and 0.5 mm or less were obtained. Table 1 (resin particles)

The respective components of Formulation 5 shown in Table 2 were mixed and vacuum degassed while stirring to obtain a thin black curable composition (A1) containing white 1 resin particles (P 2) and black resin particles (P 5). It was prepared. In addition, each component of Formulation 7 shown in Table 2 was mixed and deaerated under vacuum while stirring to prepare a white curable composition (B1). The viscosity of each of the two curable compositions was 1.0 Pa · s.

The curable composition (A1) prepared as described above was injected into a 30 cm square tray-shaped molding cell in a layered manner so as to have a thickness of 7 mm. On the other hand, the curable composition (B1) was first transferred to one pan-shaped container shown in FIG. Then, the curable composition (B1) in this container was injected onto the previously injected curable composition (A1) without breaking the interface, and an upper layer having an injection thickness of 7 mm was laminated and formed. .

Next, the comb-shaped member 1 having the shape shown in FIG. 2 was immersed in one end of the molding cell, and the teeth were moved at a distance of 50 mm / cm2 toward the other end while contacting the bottom surface of the molding cell. This comb-shaped member 1 was made of a polytetrafluoroethylene plate having a thickness of 3 mm. The tooth width is 5mm and the tooth spacing is 25mm. After the movement of the comb-like member, the molding cell was covered, and left for 30 minutes while keeping the temperature, thereby obtaining a sheet-like cured product.

The surface of this cured product was cut to a depth of 0.3 mm with a woodworking planer and polished with a # 120, # 400, and # 600 sandpaper in order, and had both grain and stripe patterns. First, granite-like artificial marble with high commercial value was obtained.

Mix each component of Formulation 6 shown in Table 2 and deaerate while stirring, vacuum 1 resin particles (Pl, P 2), white 2 resin particles (P 3, P 4), black resin particles (P 5) A thin black dangling composition (A2) containing brown resin particles (P 6) was prepared. In addition, each component of Formulation 7 shown in Table 2 was mixed, and the mixture was vacuum-degassed with stirring to prepare a white curable composition (B1). The viscosities of these two curable yarns were both l.OPa · s.

The stiffening composition (A 2) prepared as described above was injected into a 30 cm square tray-shaped molding cell in the same manner as in Example 1. On the other hand, the curable composition (B1) was also laminated on the curable composition (A2) in the same manner as in Example 1, and the comb-like member was moved and cured in the same manner as described above, and was polished with a planar paper. After polishing, artificial marble with both subtle hue, depth, and texture was obtained.

First, in the same manner as in Example 2, a thin film containing white 1 resin particles (Pl, P2), white 2 resin particles (P3, P4), black resin particles (P5), and brown resin particles (P6) A black curable composition (A2) was prepared, and a half of the curable composition (A2) was separated and placed in a 30 cm square tray-shaped mold so as to have a thickness of 7 mm. It was poured in layers.

— On the other hand, 4.5 g of white pigment (manufactured by Encolor, trade name: 11W1180) and 10.5 g of syrup were mixed well with the remaining half of the curable composition (A2). ), And mix uniformly, white 1 resin particles (Pl, P 2), white 2 resin particles (P 3, P4), black resin particles (P 5), brown resin particles (P 6) Thus, a gray curable composition (B2) containing was obtained. This curable composition (B2) is used as a curable composition. (A2) was laminated in the same manner as in Example 1, and the comb-like member was moved and cured in the same manner as described in Example 1, and was polished with a sandpaper and polished with sandpaper to have both a grain pattern and a stripe pattern. An artificial marble with subtle shades, depth and texture was obtained.

First, in the same manner as in Example 2, white 1 resin particles (P1, P2), white 2 resin particles (P3, P4), black resin particles (P5), and brown resin particles (P6) are included. A curable composition (A2) was prepared. A half of this curable composition (A2) is taken, and 0.03 g of a colorant composition [black pigment (manufactured by Pencolor, trade name 11B1513) and 9.97 g of syrup are mixed well. While stirring the mixture for 10 seconds with a stirring bar so as not to mix completely, to prepare a curable composition (A3) with incomplete mixing. The appearance of this curable composition (A3) had spots of light black and dark black. The curable composition (A3) was injected into a 30 cm square tray-like mold so as to have a thickness of 7 mm and while being moved in one direction in a layered manner with respect to the molding cell.

On the other hand, a gray curable composition (B2) was obtained in the same manner as in Example 3 using the remaining one-half curable composition (A2). This curable composition (B 2) was laminated on the curable composition (A 3) in the same manner as in Example 1, and a comb-like member was similarly formed on the curable composition.

It was moved in the same direction as the direction of the flow pattern in (A3). When this was cured, it was ground with a plane and polished with sandpaper. As a result, artificial marble with both subtle colors, depth and texture was obtained, having both grain and stripe patterns.

Table 2 (Curable composition)

As described above, according to the present invention, the combination of the grain size and color and the stripe pattern color pattern has, for example, a three-dimensional effect and texture of natural granite, a deep color pattern, It is possible to easily and satisfactorily produce artificial marble having an excellent appearance such as a granite-like appearance.

Furthermore, since the stripe pattern is formed continuously also in the thickness direction of the artificial marble, the pattern does not disappear even if the surface of the artificial marble is cut. Further, by controlling the shape of the teeth of the comb-shaped member and the moving direction of the teeth, the width of the stripe pattern and the running direction can be adjusted. Furthermore, if the components of the base portion and the stripe handle portion of the artificial marble are almost the same, there is no reduction in the mechanical properties of the artificial marble due to the provision of the handle.

Claims

The scope of the claims

1. Inject a curable composition (A) containing 0.5 to 30% by mass of resin particles having a diameter of 0.1 to 5.0 mm into a molding cell, and place the curable composition (A) on the injected curable composition (A). The curable compositions (A) and (A) are laminated in such a manner that the curable composition (B) of a different color is laminated in one or more layers, and the comb-shaped member is laminated while its teeth are in contact with the bottom surface of the molded cell. B) A method for producing an artificial marble having both a grain pattern and a stripe pattern, having a step of hardening after moving inside.

2. The method for producing artificial marble according to claim 1, further comprising a step of grinding the surface after the curing step.

3. The method for producing artificial marble according to claim 1, wherein the viscosity of the curable compositions (A) and (B) is in the range of 0.3 to 5. OPa · s.

4. The method for producing artificial marble according to claim 1, wherein the resin particles are obtained by curing and then pulverizing the resin composition.