JP2000239466A - Woodgrain pattern-forming thermoplastic resin composition and woodgrain patterned molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a woodgrain pattern-forming thermoplastic resin composition which stably yields desirable woodgrain patterns and provides a woodgrain patterned molded product having a high impact resistance and a woodgrain patterned molded product having a high weather resistance. SOLUTION: A woodgrain pattern-forming thermoplastic resin composition is prepared by mixing a base material which comprises a styrene resin added with wood meals and has an elastic modulus at 150 deg.C of within the range of from 1×107 to 1×108 dyn/cm2, and a color material in a pellet form which comprises a colorant-containing thermoplastic resin and has an elastic modulus at 150 deg.C of within the range of from 2×108 to 5×1010 dyn/cm2. Further, a woodgrain patterned molded product is prepared by coating the surface of this composition with a transparent weather-resistant resin when molding this composition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood grain pattern forming thermoplastic resin composition and a wood grain pattern molded product.
The present invention relates to a wood grain pattern forming thermoplastic resin composition having a wood grain pattern having an arbitrary wood grain pattern such as a board grain pattern or a straight grain pattern, and having excellent impact resistance, and a wood grain pattern forming thermoplastic resin composition. The present invention relates to a wood-grain pattern molded article having excellent weather resistance obtained by coating a transparent weather-resistant resin at the time of molding.

[0002]

2. Description of the Related Art
As a method of giving a wood grain pattern to a molded article, a method of mixing a base material and a coloring material having greatly different melt viscosities and extruding the mixture is used. The molded product obtained by such a method can be given a wood grain pattern by a flow pattern of a coloring material.

However, in the prior art, the melt viscosity of the base material and the coloring material is greatly different, so that the flow of the resin in a molding machine such as an extruder becomes unstable, and it is difficult to obtain a stable grain pattern. Was. Further, there is a problem that the reproducibility is poor and the grain pattern cannot be arbitrarily adjusted.

Therefore, the present invention provides a wood grain pattern forming thermoplastic resin composition which can obtain a wood grain pattern stably and at the same time, can obtain an arbitrary wood grain pattern and can obtain a wood grain pattern molded article having excellent impact resistance. It is an object of the present invention to provide an article and a molded article having a wood grain pattern excellent in weather resistance.

[0005]

Means for Solving the Problems To achieve the above object,
The thermoplastic resin composition of the present invention having a wood grain pattern is
0 to 10 parts by weight of wood flour based on 100 parts by weight of lene resin
0 parts by weight or less, elastic modulus at 150 ° C
Is 1 × 10⁷~ 1 × 10⁸dyn / cm²Is in the range
Contains pellet or powder base material and colorant
Elastic modulus at a temperature of 150 ° C.
Is 2 × 10⁸~ 5 × 10¹⁰dyn / cm ²In the range
And pelletized coloring materials.
are doing. As a result, the surface of the molded product is
Wood pattern can be provided.

Further, the melt viscosity of the base material is 2 at a temperature of 180 ° C. and a shear rate of 1 × 10 ² sec ⁻¹ .
It is in the range of × 10 ^{4 to} 7 × 10 ⁴ poise, and the coloring material has a temperature of 180 ° C. and a shear rate of 1 × 10 ² sec.
The melt viscosity at ^-1 is 2 × 10 ^{4 to} 7 × 10 ⁴ poise and 8 × 10 ^{4 to} 3 × 10 ⁵ poise. A pattern can be formed. The impact resistance can be improved by containing the rubber component in the styrene resin in an amount of 5% by weight or more and 40% by weight or less.

The wood grain pattern molded article of the present invention is characterized by extruding the above-mentioned wood grain pattern forming thermoplastic resin composition into a predetermined shape,
By providing a coating layer of 20 μm or more and 300 μm or less made of a transparent weather resistant resin on the surface, the weather resistance can be significantly improved.

The styrenic resin used as the base material of the base material of the present invention is not particularly limited in its kind, and can be selected according to the performance such as heat resistance. Specifically, ABS (acrylonitrile-butadiene rubber-styrene copolymer) resin, AES (acrylonitrile-ethylene propylene rubber-styrene copolymer) resin, AAS
(Acrylonitrile-acrylic rubber-styrene copolymer) resin and the like, and a mixture thereof can be used. Further, a mixture of a styrene-based resin with a PVC resin, a PC (polycarbonate) resin, a polyester resin, a polyamide resin, a PPE (polyphenylene ether) resin (including a styrene-modified PPE resin), or the like can also be used.

The above-mentioned styrenic resin is generally sufficient, but preferably contains a rubber component in a range of 5% by weight to 40% by weight, and more preferably 10% by weight to 3% by weight.
Those containing in an amount of 0% by weight or less are preferable. By including the rubber component in such a range, the surface appearance, impact resistance, and heat resistance can be improved. Also,
When a styrene resin modified with α-methylstyrene, phenylmaleimide, or the like is used, heat resistance can be improved.

The wood powder to be filled in the styrene resin is not particularly limited, and wood powder such as pine, toga, cherry, cedar, cypress, beech, lauan, and fir can be used. As the shape of the wood flour, a pulverized product is preferable, and a powder having a size of 100 mesh or less is preferable in terms of fineness of the woody texture.

The filling amount of the wood powder into the styrene resin is as follows:
0 to 1 part by weight based on 100 parts by weight of styrene resin
The amount is suitably not more than 00 parts by weight, and preferably not less than 10 parts by weight and not more than 50 parts by weight in consideration of a feeling of woodiness and moldability. If the filling amount of the wood powder exceeds 100 parts by weight, molding becomes difficult and the impact resistance of the molded product decreases. In addition, when the filling amount is 0 parts by weight, the woody feeling is impaired, but the wood grain pattern can give the wood atmosphere.

Further, an additive such as a lubricant may be added to improve the moldability of the base material. In this case, however, styrene must be used in order not to lower the heat-sealing strength with the transparent weatherable resin described later. A styrene-modified polyethylene wax that is compatible with the base resin and has a molecular weight of 1,000 to 500.
It is preferable to use one having 0.

The addition amount of the styrene-modified polyethylene wax is preferably 0.1 to 30 parts by weight based on 100 parts by weight of the styrene resin. The range of not less than 10 parts by weight and not more than 10 parts by weight is suitable. If the amount is less than 0.1 part by weight, the smoothness of the appearance may be impaired. If the amount exceeds 30 parts by weight, the styrene-modified polyethylene wax bleeds out, and the heat-sealing molding with the transparent weather-resistant resin becomes impossible. become unable.

In addition to the above, if necessary, fillers such as calcium carbonate, talc, mica and glass beads, coloring agents such as dyes and pigments, weathering agents such as ultraviolet absorbers and light stabilizers, flame retardants, A reinforcing agent such as carbon fiber or glass fiber can be arbitrarily added within a range that does not impair the appearance of the molded product, the moldability, and the physical properties of the molded product.

Although the composition of the thermoplastic resin used for the coloring material is not particularly limited, it is preferable to use any one of a styrene resin, a polycarbonate resin, and an acrylic resin. In addition, each resin can be mixed at an arbitrary ratio, and in addition to the resin, if necessary, a lubricant, a filler, a weathering agent, a flame retardant, a reinforcing agent, and the like may be added to the molded product appearance, molding processability, molded product. It can be added arbitrarily as long as the properties are not impaired.

As the styrene resin used for the coloring material, for example, commercially available resins such as SAN (styrene-acrylonitrile copolymer) resin, ABS resin, AAS resin and AES resin can be used. And a SAN resin modified with phenylmaleimide or the like.

Further, as the polycarbonate resin,
Those using bisphenol A are preferred because of their excellent mechanical properties and transparency, and acrylic resins such as PM
MA (polymethyl methacrylate) resin and the like are preferable in terms of moldability.

The above-mentioned thermoplastic resin has a glass transition temperature (Tg) higher than the glass transition temperature of the styrene resin as a base material by 20 ° C. or more and a temperature of 190 ° C.
The melt viscosity ratio at 1 ° C. and a shear rate of 1 × 10 ² sec ⁻¹ is not less than ５ and not more than 5
It is preferable to use one having 0/1 or less. If the temperature difference of the glass transition temperature is smaller than 20 ° C., the styrenic resin of the base material and the thermoplastic resin of the colored pellets may be mixed to make it impossible to form a pattern. If the melt viscosity ratio is less than 1/2, the colored pellets are uniformly dispersed and no pattern is formed. If the melt viscosity ratio is more than 50/1, the dispersion of the colored pellets is poor and does not clearly appear as a grain pattern. Sometimes.

Further, as the coloring material, a temperature of 180
C., a melt viscosity at a shear rate of 1 × 10 ² sec ⁻¹ and a relatively high melt viscosity are appropriately mixed and used, and by appropriately setting the mixing ratio, various wood grain patterns can be obtained. It can be formed arbitrarily, and a wood pattern with stronger contrast can be obtained.

If the amount of the coloring material is less than 0.5 parts by weight, the coloring material is in a state of being incorporated into the color of the styrene resin as the base material, and the grain pattern is not clear. If the amount exceeds the weight part, the color of the colored pellets may appear too much and the grain pattern may become unclear. In addition, the coloring agent mixed with the coloring pellets is not particularly limited, and various pigments and dyes can be used arbitrarily.

On the other hand, the transparent weather-resistant resin which is the main component of the coating layer may be any resin that can be thermally fused with the styrene resin as the base material. Examples thereof include acrylic resin, ABS resin, and AE resin.
S resin, AAS resin, PVC resin, PC resin, polyester resin, polyamide resin, PPE resin (including styrene-modified PPE resin), and the like, and a mixture of two or more of these can be suitably used.

The thickness of the transparent weather-resistant resin varies depending on the ultraviolet absorbing ability, but is suitably in the range of 20 to 300 microns, particularly 50 to 12 microns.
A range of 0 microns or less is preferred. If the thickness is less than 20 microns, the ultraviolet absorbing ability is insufficient. For example, in a weather resistance test using a sunshine weather meter at a black panel temperature of 63 ° C, discoloration and fading of the base material occur in 500 hours. Conversely, even if the thickness exceeds 300 microns, the effect of improving the weather resistance is hardly observed, and the contrast of the base material is weakened, so that a molded article having a good grain pattern cannot be obtained.

If necessary, an ultraviolet absorber, a matting agent, a lubricant and the like are added to the transparent weatherable resin within a range that does not impair the visibility of the grain pattern, the texture of wood, and the heat-sealing property with the substrate. be able to.

The ultraviolet absorber can be appropriately selected according to the type of the resin as the main component. For example, salicylates, benzophenones, benzotriazoles, cyanoacrylates, nickel chelates and the like can be used, and hindered amines (HALS) can be used in combination. In particular, when the transparent weatherable resin is an acrylic resin filled with a matting agent, it is preferable to use a benzotriazole-based ultraviolet absorber. There is no particular limitation on the filling amount, but in the above-mentioned weather resistance test with a sunshine weather meter, in order to prevent discoloration and fading of the substrate in 500 hours, 0.5% by weight is used.
The above is preferred.

The matting agent is added as needed in order to make the surface gloss appropriate. The type and amount of the matting agent are not particularly limited. However, usually, the matting agent is compatible with the material of the transparent weather-resistant resin. May be determined according to Generally, silica particles having a particle diameter of 0.05 to 5 microns are used, and a coupling treatment can be performed depending on compatibility with the resin.

The method of coating a transparent weather-resistant resin on a wood grain pattern molded product is basically performed by heat fusion. Therefore,
As a coating method, such as co-extrusion molding, a method of simultaneously forming a wood grain pattern molded article and coating of a transparent weatherable resin, or forming a coating layer on the surface of a previously molded wood grain pattern molded article by thermal lamination molding It can be performed by a method or the like. It is possible to obtain sufficient weather resistance by applying the transparent weather-resistant resin to the wood-grain pattern molded product only when exposed to light or rain, but it is appropriately selected depending on the coating method (molding method). There is no problem at all even if the whole surface of the wood grain pattern molded product is covered. Furthermore, at the time of molding by extrusion molding or thermal lamination molding, by transferring the embossed pattern using an embossing roll before cooling with a sizing or cooling roll, etc., to obtain a wood grain pattern molded article having an uneven pattern on the surface. Is also possible.

For example, by molding using a common co-extrusion molding machine 1 as shown in the sectional view of FIG. 1, formation of a grain pattern and coating with a weather-resistant resin can be performed simultaneously. That is, while supplying the wood grain pattern forming thermoplastic resin composition A to the inner supply portion 3 of the die 2 and supplying the transparent weatherable resin B from the outer supply portion 4 and co-extruding the same, the cross section of FIG. As shown in the figure, it is possible to obtain a molded article having a two-layer structure in which a coating layer 6 made of a transparent weather-resistant resin is formed on a surface of a base material 5 made of a thermoplastic resin composition having a wood grain pattern.

The extruded molded product is cooled using a sizing 7 or a cooling roll. Before being cooled by the sizing 7, an embossed pattern is transferred using an embossing roll 8 so that an uneven pattern is formed on the surface. It is also possible to obtain a molded article having the same.

By appropriately setting the properties and mixing ratio of each resin, the properties and blending amounts of the coloring materials, the extrusion speed, and the like, molded articles having various wood grain patterns W as shown in FIGS. P1 to P4 are obtained.

[0030]

EXAMPLES Examples of the present invention will be described below, but the scope of the present invention is not limited by the following examples.

Example 1 ABS resin 100 containing 20% by weight of butadiene rubber
25 parts by weight of wood flour (trade name: Cellulosin # 100), styrene-modified polyethylene wax (trade name: High Wax 116, manufactured by Mitsui Chemicals, Inc.)
0H) The composition containing 10 parts by weight was pelletized with a coaxial twin-screw extruder, and the elastic modulus at a temperature of 150 ° C. was 5 ×.
10 ⁷ dyn / cm ² , temperature 180 ° C, shear rate 1 × 1
A base material having a melt viscosity at 0 ² sec ⁻¹ of 5 × 10 ⁴ poise was obtained.

On the other hand, a composition prepared by blending 50 parts by weight of a coloring pigment with 100 parts by weight of a phenylmaleimide-modified SAN resin was pelletized using a co-axial twin-screw extruder.
A colored material (1) having an elastic modulus at 50 ° C. of 7 × 10 ⁹ dyn / cm ² , a temperature of 180 ° C., and a melt viscosity of 1 × 10 ⁵ poise at a shear rate of 1 × 10 ² sec ⁻¹ was obtained.

A composition obtained by blending 50 parts by weight of a coloring pigment with 100 parts by weight of a PC resin was pelletized by using a biaxial extruder in the same direction.
× 10 ¹⁰ dyn / cm ² , temperature 180 ° C, shear rate 1
A coloring material (2) having a melt viscosity of 5 × 10 ⁴ poise at × 10 ² sec ⁻¹ was obtained.

2 parts by weight of the coloring material (1) and 2 parts by weight of the coloring material (2) are mixed with 100 parts by weight of the base material.
A wood grain pattern forming material was obtained.

This wood grain pattern forming material is formed into a plate shape by a single screw extruder, and at the same time, an acrylic resin coating layer of 100 μm is formed by a co-extruder to obtain a plate-shaped two-layer molded product having a wood grain pattern. . In the acrylic resin coating layer, 2% by weight of 2- (3,5-di-t-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole as an ultraviolet absorber and a matting agent were added to the acrylic resin. A material containing 2.5 parts by weight of silica (based on 100 parts by weight of acrylic resin, the same applies hereinafter) was used.

Example 2 The filling amount of wood powder in the base material was 0 parts by weight, the elastic modulus at a temperature of 150 ° C. was 2 × 10 ⁷ dyn / cm ² ,
A plate-like two-layer molded article was formed in the same manner as in Example 1 except that a base material having a melt viscosity of 2 × 10 ⁴ poise at a temperature of 180 ° C. and a shear rate of 1 × 10 ² sec ⁻¹ was used.

Example 3 The filling amount of wood powder in the base material was 100 parts by weight,
The elastic modulus at a temperature of 150 ° C. is 8 × 10⁷dyn / cm
², Temperature 180 ° C, shear rate 1 × 10²sec ^-1In
Melt viscosity 7 × 10⁴Use base material that is poise
A plate-like two-layer molded product was formed in the same manner as in Example 1 except that
Shaped.

Example 4 The content of butadiene rubber in the base material was 5% by weight.
And the elastic modulus at a temperature of 150 ° C. is 3 × 10 ⁷ dyn
/ Cm ² , temperature 180 ° C, shear rate 1 × 10 ² sec
Except for using a base material having a melt viscosity of 7 × 10 ⁴ poise at ^−1, a plate-shaped two-layer molded product was formed in the same manner as in Example 1.

Example 5 The content of butadiene rubber in the base material was 40% by weight.
% And the elastic modulus at a temperature of 150 ° C. is 6 × 10⁷dy
n / cm², Temperature 180 ° C, shear rate 1 × 10 ²sec
^-17 × 10⁴Poise is a base
Except that the material was used, a two-layer plate was formed in the same manner as in Example 1.
Shaped articles were molded.

Example 6 The coloring material (1) was mixed with 50 parts by weight of a coloring pigment based on 75 parts by weight of a phenylmaleimide-modified SAN resin and 25 parts by weight of a PC resin, and had an elastic modulus of 4 × at a temperature of 150 ° C.
10 ⁸ dyn / cm ² , temperature 180 ° C, shear rate 1 × 1
A plate-like two-layer molded article was formed in the same manner as in Example 1, except that the melt viscosity at 0 ² sec ^-1 was 8 × 10 ⁴ poise.

[0041] EXAMPLE 7 coloring material (2), PC resin 75 colored pigment were blended 50 parts by weight with respect to the parts by weight polyarylate resin 25 parts by weight, ¹ elastic modulus 3 × ¹⁰ at a temperature 0.99 ° C. ⁰ dyn
/ Cm ² , temperature 180 ° C, shear rate 1 × 10 ² sec
Except that the melt viscosity at ^-1 was 7 × 10 ⁴ poise, a plate-shaped two-layer molded product was formed in the same manner as in Example 1.

Example 8 A plate-like two-layer molded article was formed in the same manner as in Example 1 except that the thickness of the acrylic resin coating layer on the surface was changed to 20 μm.

Example 9 A plate-like two-layer molded product was formed in the same manner as in Example 1 except that the thickness of the acrylic resin coating layer on the surface was changed to 300 μm.

Comparative Example 1 The filling amount of wood powder in the base material was 125 parts by weight.
The elastic modulus at a temperature of 150 ° C. is 1 × 10⁸dyn / cm
², Temperature 180 ° C, shear rate 1 × 10²sec ^-1In
Melt viscosity of 8 × 10⁴Except that it was poise
In the same manner as in Example 1, a plate-like two-layer molded product was formed.

Comparative Example 2 The content of butadiene rubber in the base material was 0% by weight.
And the elastic modulus at a temperature of 150 ° C. is 2 × 10 ⁷ dyn
/ Cm ² , temperature 180 ° C, shear rate 1 × 10 ² sec
Except that the melt viscosity at ^-1 was 2 × 10 ⁴ poise, a plate-shaped two-layer molded article was formed in the same manner as in Example 1.

Comparative Example 3 The content of butadiene rubber in the base material was changed to 50% by weight.
% And the elastic modulus at a temperature of 150 ° C. is 6 × 10⁷dy
n / cm², Temperature 180 ° C, shear rate 1 × 10 ²sec
^-1Melt viscosity at 8 × 10⁴What is poise
A plate-like two-layer molded product was formed in the same manner as in Example 1 except that
Shaped.

Comparative Example 4 A coloring material (1) was mixed with 50 parts by weight of a phenylmaleimide-modified SAN resin and 50 parts by weight of a SAN resin, and 50 parts by weight of a coloring pigment.
× 10 ⁷ dyn / cm ² , temperature 180 ° C, shear rate 1 ×
10 ² sec ^- except that the melt viscosity of ¹ was assumed to be 7 × 10 ⁴ poise, in the same manner as in Example 1 the plate 2
A layer molded article was formed.

[0048] Comparative Example 5 coloring material (2), PC resin 25 parts by weight of colored pigment relative to the polyarylate resin 75 parts by weight were blended 50 parts by weight, ¹ elastic modulus 7 × ¹⁰ at a temperature 0.99 ° C. ⁰ dyn
/ Cm ² , temperature 180 ° C, shear rate 1 × 10 ² sec
Except that the melt viscosity at ^-1 was 7 × 10 ⁴ poise, a plate-shaped two-layer molded product was formed in the same manner as in Example 1.

Comparative Example 6 A plate-like two-layer molded article was formed in the same manner as in Example 1 except that the thickness of the acrylic resin coating layer on the surface was changed to 10 μm.

Comparative Example 7 A plate-like two-layer molded product was formed in the same manner as in Example 1 except that the thickness of the acrylic resin coating layer on the surface was changed to 400 μm.

Comparative Example 8 A plate 2 was prepared in the same manner as in Example 1 except that 4 parts by weight of only the coloring material (1) was mixed with 100 parts by weight of the base material.
A layer molded article was formed.

Comparative Example 9 A plate 2 was prepared in the same manner as in Example 1 except that 4 parts by weight of the coloring material (2) alone was mixed with 100 parts by weight of the base material.
A layer molded article was formed.

The plate-like two-layer molded products formed in each of the examples and comparative examples were subjected to a state of appearance (grain pattern) immediately after production and a weather resistance test using a sunshine weather meter at a black panel temperature of 63 ° C. for 500 hours. The appearance (weather resistance discoloration) after the test was visually determined. In addition, according to JIS K 7111, 23 ° C
The Charpy impact value (kg · cm / cm ² ) at the time of was measured to evaluate the impact resistance. Table 1 and Table 2 show the evaluation results.
Shown in

The evaluation criteria in the table are as follows.

Wood grain pattern ：: Good wood grain contrast Δ: Wood grain contrast is observed X: Hardly any wood grain contrast is observed Weathering resistant discoloration ○: No discoloration and discoloration With fading Impact resistance (Charpy impact value: kg · cm / cm ² ) ○: 10 or more △: 3 to 9 ×: 2 or less

[0056]

[Table 1]

[0057]

[Table 2]

[0058]

As described above, according to the present invention,
It is excellent in wood grain pattern and its stability and reproducibility, and can freely form any wood grain pattern. Moreover, it is excellent in impact resistance, and by coating with a transparent weather resistant resin, it is possible to obtain a molded article excellent in weather resistance while maintaining a wood grain pattern.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a state in which a wood grain pattern molded product of the present invention is molded using a co-extrusion molding machine.

FIG. 2 is a cross-sectional view of a wood grain pattern molded product.

FIG. 3 is a front view showing an example of a grain pattern of a molded grain pattern product.

FIG. 4 is a front view showing an example of a wood grain pattern of a wood grain molded article.

FIG. 5 is a front view showing an example of a wood grain pattern of a wood grain molded article.

FIG. 6 is a front view showing an example of a grain pattern of a grain-shaped molded product.

[Description of Signs] 1 ... Co-extrusion molding machine, 2 ... Dies, 3 ... Inner supply unit, 4 ...
Outside supply part, 5: substrate composed of a wood-grain pattern-forming thermoplastic resin composition, 6: coating layer made of a transparent weather-resistant resin, 7: sizing, 8: embossing roll, A: wood-grain pattern-forming thermoplastic resin composition, B: transparent weather resistant resin, P1 to P4: molded product, W: wood grain pattern

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI theme coat ゛ (Reference) B29K 511: 14 F term (Reference) 4F207 AA01 AA13 AA45 AA49 AB12 AB14 AC01 AC04 AF08 AG03 KA01 KA17 KB22 KF01 KL65 4J002 AH00Y BC03W BC03Z BC04W BC04Z BC06Z BD03X BG00Z BG06Z BN06X BN06Z BN12X BN12Z BN15X BN15Z CF00X CG00X CG00Z CH07X CL00X FD096 GF00

Claims (5)

[Claims] 1. A mixture of 0 to 100 parts by weight of wood flour with respect to 100 parts by weight of a styrene resin.
The elastic modulus at 0 ° C. is 1 × 10 ⁷ to 1 × 10 ⁸ dyn /
It is composed of a pellet-shaped or powder-shaped base material having a size in the range of cm ² and a thermoplastic resin containing a colorant, and has a temperature of 15 cm ^2.
The elastic modulus at 0 ° C. is 2 × 10 ^{8 to} 5 × 10 ¹⁰ dyn
A wood grain-forming thermoplastic resin composition, characterized by being mixed with a pellet-shaped coloring material in the range of / cm ² . 2. The method according to claim 1, wherein said base material has a melt viscosity of 18 ° C.
0 ° C, shear rate 1 × 10 ²sec^-1At 2 × 10
⁴~ 7 × 10⁴In the range of poise, and the coloring material
The temperature was 180 ° C and the shear rate was 1 × 10²sec^-1To
Melt viscosity is 2 × 10⁴~ 7 × 10⁴Poise Wear
Color material and 8 × 10⁴~ 3 × 10⁵With poise coloring material
Must be a mixture of at least one of each
The grain-pattern-forming thermoplastic resin according to claim 1,
Composition. 3. The thermoplastic resin composition according to claim 1, wherein the styrene resin contains a rubber component in an amount of 5% by weight or more and 40% by weight or less. 4. A wood grain pattern molded article obtained by extruding the wood grain pattern forming thermoplastic resin composition according to claim 1, 2 or 3. 5. The thermoplastic resin composition according to claim 1, 2 or 3, wherein a coating layer of 20 μm to 300 μm made of a transparent weatherable resin is provided on the surface thereof. A wood-grain pattern molded product characterized by that: