JP2000109589A - Woodgrain resin molding product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a woodgrain resin molding product having excellent woody feeling, simple in color control in a woody ABS-based resin molding product and stable in physical properties especially while suppressing reduction in impact strength and change in hue. SOLUTION: This woodgrain resin molding product having 0.5-1.0 specific gravity is obtained by mixing 100 pts.wt. of a resin composition comprising 1-60 wt.% of cellulose powder having >=80% whiteness and 40-99 wt.% of an acrylonitrile-butadiene-styrene copolymer resin (ABS resin) with 0.1-10 pts.wt. of a resin composition comprising 3-20 wt.% of a colorant and 80-97 wt.% of a resin not completely compatible with the ABS resin and 0.01-1 pt.wt. of a blowing agent and molding the mixture.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood-grained resin molded product, and more particularly to a wood-grained resin molded product having a stable hue and excellent woody appearance.

[0002]

2. Description of the Related Art Conventionally, acrylonitrile-butadiene-styrene copolymer resin (hereinafter referred to as ABS resin).
Is known as a resin having excellent physical properties and is used as a molding material. For example, it is used for automobile parts, household electric parts, office equipment parts, mechanical parts, and the like. On the other hand, recently, as the interior materials for automobiles and the interior of houses, for example, woodgrain-like materials having a texture close to that of natural wood have been used for window frames, door frames, floors, ceilings, stair railings, and the like. I have. In the field of building materials, there is an increasing demand for exterior materials for houses and the like using warm wood-like products made of the same wood-grained material as natural wood with high quality.

[0003] Conventionally, in order to meet this demand, since a feeling of wood cannot be obtained with the ABS resin itself, studies using a composition to which a cellulosic additive such as wood flour or paper is added have been conducted. For example, in order to obtain a woody feeling using an ABS resin, a hard resin composition containing wood powder and foamed has been manufactured. However, when general wood flour is added to the ABS resin, the acid is generated from the wood flour due to the acid generated from the wood flour.
There is a problem that the deterioration of the resin progresses, and not only the impact strength is lowered but also the color tone is significantly reduced, and
The BS resin composition tends to turn brown, and the color of wood powder of natural products may not be constant, and there is a problem that color management of the product is difficult. In addition, since impurities such as lignin contained in wood flour have a yellow tint, a large amount of a coloring agent required for coloring is required, and when performing foam molding, this lignin inhibits foaming. There was a tendency. As means for solving these problems, Japanese Patent Publication No. Hei.
A method of suppressing the release of wood acid by a method in which a white inorganic pigment is supported on the surface of woody powder using a ball mill is disclosed. However, in this method, the white pigment must be supported on wood powder, the number of steps is increased, the processing efficiency is low, and it is economically unsuitable, so that wood acid cannot be essentially suppressed.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems in the conventional method, simplifies color management, reduces the change in hue and stability of physical properties, and provides a wood grain with an excellent wood texture. It is an object of the present invention to provide a conditioned resin molded product.

[0005]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve such a problem, and as a result, have reached the present invention. That is, the present invention provides (1) 1 to 60% by weight of a cellulose powder having a whiteness of 80% or more and an acrylonitrile-butadiene-styrene copolymer resin (hereinafter referred to as ABS resin) 40
(2) 3 to 20% by weight of a colorant and 80 to 97% by weight of a resin that is not completely compatible with the ABS resin, based on 100 parts by weight of the resin composition of 0 to 99% by weight. It is a woodgrain-like resin molded product having a specific gravity of 0.5 to 1.0 obtained by mixing and molding 0.1 to 10 parts by weight of (1) and 0.01 to 1 part by weight of a foaming agent (3).

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The cellulose powder having a whiteness of 80% or more in the present invention refers to a whiteness of 80% by removing impurities such as wood acid and lignin by treating wood, pulp and paper with an acid and an alkali. % Or more of cellulose powder,
The acid or alkali treatment here involves, for example, crushing and sorting wood, pulp and paper into chips of a suitable size, acid-hydrolyzing the chips with hydrochloric acid or sulfuric acid, filtering, washing with water,
A method of removing impurities such as wood acid and lignin by dehydration and drying, and further pulverization and screening, or 100 to 1 with a mixed solution of sulfurous acid and calcium bisulfite prepared from limestone and sulfur.
A series of purification bleaching, such as heat cooking at 15 ° C., washing with water, defibration, screening, chlorine-alkali-chlorine-alkali-hypochlorite bleach-sulfuric acid or chloric acid treatment, dehydration
An acid calcium bisulfite method obtained by drying and sorting. In addition, heat digestion with sodium sulfate and sodium sulfate as main components, washing, screening, carbon dioxide bleaching, hypochlorous acid bleaching, screening, dust reduction process, sulfurous acid aqueous solution treatment, then dehydration / drying / A sulfate method obtained by sorting, a nitric acid method comprising nitric acid and alkali treatment, and a hydrotropy method using a hydrotrope salt solution are exemplified.

[0007] Cellulose powder from which impurities such as wood acid and lignin have been removed is readily available on the market. For example, KC Floc W100 (manufactured by Nippon Paper Industries Co., Ltd., having a particle size of 100 mesh pass) can be used. 10C hydrochloric acid treatment) or KC Floc W200 (10N sulfuric acid treatment) having a particle size of 200 mesh pass.
In particular, since the cellulose powder is a white fine powder, the color can be freely adjusted with a pigment or the like.

The ratio of the amount of the cellulose powder of the present invention added to the ABS is 1 to 60% by weight of the cellulose powder to the weight of the ABS.
Resin is 40 to 99% by weight. If the amount of the cellulose powder is less than 1% by weight, a woody texture of the molded product cannot be obtained,
If the content is more than 60% by weight, the processability of the resin composition decreases, and molding becomes difficult.

The ABS resin referred to in the present invention is a resin composed of a copolymer of a rubbery polymer, a styrene monomer, an unsaturated nitrile monomer and, if necessary, another monomer.
Here, as the styrene monomer, styrene, α-alkylmonovinylidene aromatic monomer (for example, α-methylstyrene; α-ethylenestyrene; α-methylvinyltoluene; α-methyldialkylstyrene; etc.), ring Substituted alkylstyrenes (e.g., om- and p-vinyltoluene; o-ethylstyrene; p-ethylstyrene; 2,
4-dimer styrene; p-tertiary butyl styrene;
Etc.), ring-substituted halostyrenes (eg, o-chlorostyrene; p-chlorostyrene; o-bromostyrene; 2,4
-Dichlorostyrene; etc.) ring-alkyl, ring halo-substituted styrenes (eg, 2-chloro-4-methylstyrene;
2,6-dichlorostyrene; etc.) One or a mixture of vinyl naphthalene and vinyl anthracene is used. The above substituted alkyl groups have from 1 to 4 carbon atoms and include isopropyl and isobutyl groups. Among them, one or a mixture of monovinylidene aromatic monomers is preferably used.

The unsaturated nitrile monomers include:
Examples include acrylonitrile, methacrylonitrile, ethacrylonitrile, fumaronitrile, and mixtures thereof. The rubbery polymer may be a polybutadiene such as a conjugated 1,3-diene (eg, butadiene; isoprene; etc.), a styrene-butadiene copolymer, an EPDM (ethylene-propylene-diene methylene linkage), or a mixture thereof. No.

The other monomers referred to in the present invention include styrene,
The monomer is not particularly limited as long as it is a monomer copolymerizable with acrylonitrile, and examples thereof include acrylates such as methyl methacrylate and maleimides such as N-phenylmaleimide and cyclohexylmaleimide.

The acrylonitrile component in the polymer component (A) obtained by removing the components insoluble in the mixture of methyl ethyl ketone and methanol 7: 3 from the ABS resin of the present invention is 10-3.
0% by weight and the reduced viscosity (η) of the polymer component (A).
sp / c) is 0.40 to 0.90 dl / g, preferably 0.40 to 0.80 dl / g, and more preferably 0.45 to 0.75 dl / g. The reduced viscosity is 0.
If it is less than 40 dl / g, the impact strength is remarkably reduced, so that it is not preferable. If it exceeds 0.90 dl / g, the fluidity is reduced, the molding temperature is increased, and the hue is deteriorated. Here, the reduced viscosity refers to a solution obtained by precisely weighing 0.25 g of the sea-phase component (S) and dissolving it in 50 ml of dimethylformamide for 2 hours using an Ubbelohde viscometer with a solvent flowing time of 20 to 100 seconds. The reduced viscosity is a value obtained by measuring in an environment of 30 ° C., and the reduced viscosity is determined from the number of seconds flowing down of the solvent (t ₀ ) and the number of seconds flowing down of the solution (t) by the following formula (Formula 1).

[0013]

Embedded image Reduced viscosity (ηsp / c) = ｛(t / t ₀ ) −
1｝ /0.5

The average particle size of the rubber particles comprising the rubbery polymer component in the ABS resin of the present invention is 0.4 to 4 μm, and 50% or more of the rubber particles having a particle size of 0.4 μm or more account for 0.1 μm.
m is a salami-like structure having a cell diameter of not less than m, and the cell phase area is formed as particles occupying 50% or more of the total area of the rubber particles, and the dispersed phase is formed at a ratio of 10 to 35% by weight. Is the feature. It is not preferable that the size of the rubber particles composed of the rubber-like polymer component is larger or smaller than this range because the impact strength of the molded product is reduced. That is, if the particle size of the rubber particles composed of the rubber-like polymer component is smaller than 0.4 μm, the improvement of the impact strength is small, and if it is larger than 4 μm, not only the impact strength is reduced, but also the surface of the molded product becomes rough. It is not preferable.

The present invention also includes the mixing of other ABS-based polymers or other polymers, additives, and the like, if necessary. For example, as other polymers, styrene-acrylonitrile resin, butadiene rubber, SB
R, ethylene-propylene rubber, acrylate-
Acrylic elastomers such as butadiene copolymers are preferred.

The method for producing the ABS resin in the present invention is preferably a solution polymerization method or a bulk polymerization method, which may be a known method. For example, a monomer and a monomer which can be copolymerized with the monomer if necessary. Dissolve the rubbery polymer synthesized by solution polymerization in a solvent such as monomer and ethylbenzene, toluene, methyl ethyl ketone as needed, and add or do not add a molecular weight regulator, a polymerization initiator, etc. The monomer solution of the rubber-like polymer is continuously supplied to a stirring reactor, and a part or all of the monomer is copolymerized to form particles of a rubber-like polymer component. The obtained polymer mixture is introduced into a devolatilization tank, and the solvent is separated from the polymer component when the solvent contains an unreacted monomer and a solvent. Thereafter, the pelletized ABS resin is obtained through a granulation step.

The method for obtaining the resin molded product of the present invention includes:
The above-mentioned ABS resin is added with a cellulose powder and, if necessary, a coloring agent and other additives. For example, a blended powder obtained by stirring and mixing with a Henschel mixer, a Banbury mixer, a ribbon blender, etc. In accordance with, for example, a conical twin-screw extruder, a parallel twin-screw extruder, a single-screw extruder, a kneader-type extruder, after the pelletized by a kneader such as a roll kneader,
It can be obtained as a molded product by the following various molding methods.

That is, using the blended powder or pellets obtained above, extrusion molding, profile extrusion molding, injection molding, calender molding, vacuum molding, blow molding, foam molding are performed under the condition that the cylinder temperature and the die temperature are both 200 ° C. or less. By performing melt molding such as injection press, gas assist molding, press molding, etc., it is possible to easily obtain a woodgrain-like resin molded product having an excellent woody feel. What is important here is that when the temperature of the cylinder and the die exceeds 200 ° C., the cellulose powder is burned.
It is preferable to set the following.

Another characteristic of the molded article of the present invention is that, in the case of conventional wood powder or a mixture of cellulose and ABS resin, a dust-like substance adheres to a die or a mold during extrusion or molding. However, when the molded article of the present invention is formed, the tan-like adhered substance is greatly reduced, which is also a great effect of the present invention.
Although the principle of this effect is not clear, A
It is estimated that the specific distribution of the unsaturated nitrile component contained in the sea phase component (S) of the BS-based polymer and the use of the specific rubber-like polymer will lead to a reduction in the amount of such slime-like substances. Is done.

The coloring agent in the present invention is a coloring agent for plastics, and any known coloring agent may be used.
Dyes and pigments are included, and specifically, dry color containing additives; dye / pigment + dispersant (metal soap, wax), paste color; dye / pigment + liquid dispersant (plasticizer, polyester, polyol) , Liquid color;
It is a dye / pigment + high-boiling liquid dispersant (nonionic surfactant). Specific examples of inorganic pigments as these pigments include clay, mica, loess, titanium white, zinc white, red iron oxide, chromium oxide, iron black, alumina white, yellow iron oxide, cadmium yellow, cadmium red, zinc sulfide, and antimony white. , Silver vermilion, calcium carbonate, magnesium carbonate, calcium silicate, ultramarine, talc, graphite, zinc yellow, barium yellow,
Molybdenum red, barium sulfate, lead sulfate, strontium sulfate, navy blue, aluminum hydroxide, carbon black,
Pine smoke, graphite, aluminum powder, bronze powder, etc. Specific examples of the organic pigment include madder lake, rockwood lake, cochineal lake, and cumin6.
B, red 2B, lake red C, disazo yellow, hansa yellow, naphthol red, polyazo yellow, polyazo red, phthalocyanine pigment, anthraquinone pigment, quinacridone pigment, dioxazine violet, perylene red, quinaphthalone yellow, etc. Other examples include basic dyes, acid dyes, vat dyes and mordant dyes.

These coloring agents may have a whiteness of 80 if necessary.
% Or more of the cellulose powder and the ABS resin in advance and melt-kneaded and pelletized by an extruder. Also, the same colorant or another type of colorant,
3-20 for resin not completely compatible with ABS resin
It is preferred that the weight% is similarly melt-kneaded and pelletized by an extruder.

In the present invention, in order for the molded article to have a woodgrain, the difference in compatibility between the resin containing a large amount of a colorant and the resin containing a large amount of cellulose affects the resin, so that it is not completely compatible with the ABS resin. By using a resin, a wood-grained molded product having a woody feeling can be obtained. Here, as the resin which is not completely compatible with the ABS resin, polyethylene, polypropylene,
Polyvinyl chloride, polycarbonate, polymethyl methacrylate, polyvinyl alcohol, polyethylene terephthalate, polybutylene terephthalate, polyamide,
Examples thereof include polyimides, and among them, aromatic polycarbonates are particularly preferable.

What is important in the present invention is that 1 to 60% by weight of the above-mentioned cellulose powder having a whiteness of 80% or more and 40 to 50% of the ABS resin.
The colorant 3 to 2 is used with respect to 100 parts by weight of the resin composition (1) comprising 99% by weight and a colorant added as needed.
0% by weight and resin not completely compatible with ABS resin 80 ~
0.1 to 10 parts by weight of the resin composition (2) consisting of 97% by weight. In this mixing, if the amount of the resin composition (2) is less than 0.1 part by weight, wood grain cannot be confirmed. If the amount is more than 10 parts by weight, the color becomes too dark, and the wood-grained wood texture is not obtained.

The foaming agent used in the present invention may be any of known ones. For example, gases such as air, water, nitrogen, carbon dioxide, butane gas, pentane and chlorofluorocarbon, and inorganic substances such as carbonate and bicarbonate can be used. Blowing agents and organic blowing agents such as isocyanates, azo compounds, hydrazine derivatives, semicarbazide compounds, azide compounds, nitroso compounds, and triazole compounds, for example, p, p'-oxy-bis (benzenesulfonylhydrazide), azodicarbonamide, hydrogen carbonate Sodium and the like. The amount of the foaming agent used varies depending on the molded product, but is used in an amount of 0.01 to 1.0 part by weight.

In the above-mentioned resin composition used in the present invention, generally used fillers, antioxidants, ultraviolet absorbers, nucleating agents, impact modifiers, processing aids, elastomers and the like may be used as required. Can be. The processing aid mentioned here may be any of known ones, for example, polymethyl methacrylate.

The antioxidant may be any of known ones, for example, alkylphenol type, alkylene bisphenol type, alkylphenol thioether type, β, β′-thiopropionate type, organic phosphite type, Aromatic amine type, phenol / nickel complex and the like can be mentioned. The ultraviolet absorber may be any of known ones, and examples thereof include salicylic acid esters, benzotriazoles, and hydroxybenzophenones.

The resin molded product of the present invention may further use commonly used inorganic fillers, for example, calcium carbonate, clay, hydrous silicic acid, anhydrous silicic acid, calcium silicate, aluminum silicate asbestos powder, antimony oxide. ,
Examples thereof include talc, aluminum trihydrate, hydrated zinc borate, magnesia, sodium bicarbonate, potassium nitrate, calcium hydroxide, mica, and synthetic fluorine mica. These commonly used additives are readily available on the market and can be used as needed.

[0028]

The present invention will be more specifically described below with reference to examples. This embodiment is merely an example, and the present invention is not limited to these embodiments. In this embodiment, cellulose powder and AB
The resin composition (1) comprising the S resin and a coloring agent to be added as required was pelletized using a co-kneader type extruder with the cylinder temperature and the die temperature set at 190 ° C. Further, in the production of the resin composition (2) comprising a resin and a colorant which are not completely compatible with the ABS resin, the resin was pelletized under an ordinary extrusion condition of an extruder.

The molding was performed using a Labo Plastomill-Conical twin screw extruder 2D-20C manufactured by Toyo Seiki Seisaku-Sho, Ltd., and a slit die (W = 40 mm, H = 1 m) was used as a die.
m, L = 60 mm), the cylinder temperature and the die temperature are set to an arbitrary temperature with each resin not exceeding 200 ° C., and a flat plate having a width of 40 mm and a thickness of 1 mm is formed. The wood texture was evaluated as follows.

Regarding the feeling of wood, the gloss of the molded product was measured and evaluated. The measurement was performed using a handy gloss meter gloss checker IG-320 manufactured by Horiba, Ltd. Here, it was determined that there was a woody feeling when the gloss value was 15 or less. In addition, a study was conducted in which 10 researchers other than the present researcher visually and palpated the molded article and the natural cedar board, and judged that the molded article had a woody feel close to that of the natural cedar board. The number of participants is also shown in the results.

The molecular weight of the resin is represented by a melt flow index (expressed by the weight of the resin extruded at a specific temperature under a constant load for 10 minutes; hereinafter, referred to as MI), and is measured by JIS (JIS-JIS). K7210, test temperature 20
0 ° C., weight 5.00 kgf). The specific gravity of the molded product was measured by a buoyancy method by cutting out a part of the molded product.

Example 1 Using a butadiene rubber produced by a solution polymerization method as an ABS resin, the MI produced by a continuous bulk polymerization method was 0.70.
g / 10 minutes of an ABS resin (25% by weight of an acrylonitrile component in the polymer component (A) excluding a component insoluble in a mixture of methyl ethyl ketone and methanol 7: 3;
And the reduced viscosity (ηsp / c) of the polymer component (A) is 0.1.
A salami-like structure in which the average particle diameter of rubber particles composed of a rubber-like polymer component is 2.5 μm, and 50% or more of the rubber particles having a diameter of 0.4 μm or more include a cell diameter of 0.1 μm or more. And the particles having an area of the cell diameter occupying 70% of the area of the whole rubber particles and containing the dispersed phase at a ratio of 25% by weight. ) 100 parts by weight of cellulose powder having a whiteness of 80% or more (KC Floc W10 manufactured by Nippon Paper Industries Co., Ltd.)
0) 30 parts by weight were mixed with a Henschel mixer manufactured by Mitsui Miike Co., Ltd., and the obtained composition was granulated at 190 ° C. with a buscon kneader extruder manufactured by Buss Co., to obtain pellets (1). . In addition, commercially available polycarbonate (MI: 280 ° C,
2. A value at 1.6 kg: 2.6 g / 10 min, Vicat softening point: 151 ° C.) 100 parts by weight of an anthraquinone-based orange pigment as a colorant was mixed with 5 parts by weight, and then 260 ° C. using a twin screw extruder. To obtain a pellet (2).

1 part by weight of the pellet (2) per 100 parts by weight of the pellet (1) and 0.2 parts of p, p'-oxy-bis (benzenesulfonylhydrazide) as a foaming agent.
Add the parts by weight and use a Labo Plastomill conical twin screw extruder 2D-20C manufactured by Toyo Seiki Seisaku-sho, Ltd.
The die is a slit die (W = 40mm, H = 1mm,
L = 60 mm) and the cylinder temperature was 190
℃, die temperature set to 190 ℃, width 40mm, thickness 1
mm was obtained. This flat molded product was evaluated for a feeling of wood as described above. Table 1 shows the results. Also, the adhered substance of the mold was observed, and it was determined that there was no adhered substance on the die after molding, and that there was an adhered substance.

Example 2 A butadiene rubber produced by a solution polymerization method was used as an ABS resin, and a MI produced by a continuous bulk polymerization method was 1.2.
0 g / 10 min acrylonitrile-butadiene-styrene copolymer (24% by weight of acrylonitrile component in polymer component (A) excluding components insoluble in a mixture of methyl ethyl ketone and methanol 7: 3) The reduced viscosity (ηsp / c) of the united component (A) is 0.62 dl / g.
The average particle diameter of the rubber particles composed of the rubber-like polymer component is 0.85 μm, and 50% of the rubber particles having a particle diameter of 0.4 μm or more.
The above is the salami-like structure having a cell diameter of 0.1 μm or more, and contains 30% by weight of the dispersed phase as particles whose cell diameter occupies 70% of the total area of the rubber particles. ) 100 parts by weight of 20 parts by weight of cellulose powder having a whiteness of 80% or more and 0.1 part by weight of a phosphorus-based processing stabilizer (IRGAFOS-168, manufactured by Ciba-Geigy Japan KK)
A flat molded product was obtained and evaluated in the same manner as in Example 1 except that 0.1 part by weight of a hindered phenolic antioxidant (Irganox 1010, manufactured by Nippon Ciba Geigy Co., Ltd.) was used. Table 1 shows the results.

Example 3 Pellets were obtained in the same manner as in Example 2 except that the amount of cellulose powder having a whiteness of 80% or more was changed to 80 parts by weight. Table 1 shows the results.

Example 4 A butadiene rubber produced by a solution polymerization method was used as an ABS resin, and MI produced by a continuous bulk polymerization method was 5.1.
Acrylonitrile-butadiene-styrene copolymer of 0 g / 10 min (the acrylonitrile component in the polymer component (A) excluding components insoluble in a mixture of methyl ethyl ketone and methanol 7: 3 is 15% by weight and The reduced viscosity (ηsp / c) of the united component (A) is 0.44 dl / g
The average particle diameter of the rubber particles composed of the rubber-like polymer component is 0.85 μm, and 50% of the rubber particles having a particle diameter of 0.4 μm or more.
The above is the salami-like structure including the cell diameter of 0.1 μm or more, and the dispersed phase is contained at a ratio of 33% by weight as the particle having the cell diameter occupying 80% of the entire area of the rubber particle. ) 100 parts by weight, 50 parts by weight of cellulose powder having a whiteness of 80% or more and 0.1 part by weight of a phosphorus-based processing stabilizer (IRGAFOS-168, manufactured by Ciba-Geigy Corporation)
A flat molded product was obtained and evaluated in the same manner as in Example 1, except that 0.1 part by weight of a hindered phenolic antioxidant (Irganox 1010, manufactured by Nippon Ciba Geigy Co., Ltd.) was used. Table 1 shows the results.

Example 5 A flat molded product was obtained and evaluated in the same manner as in Example 1 except that polyvinyl chloride was used instead of polycarbonate. Table 1 shows the results.

Example 6 A flat molded product was obtained and evaluated in the same manner as in Example 1 except that polyethylene terephthalate was used instead of polycarbonate. Table 1 shows the results.

Example 7 A flat molded product was obtained and evaluated in the same manner as in Example 1 except that a polyamide resin was used instead of polycarbonate. Table 1 shows the results.

[0040]

[Table 1]

Comparative Example 1 Pellets were obtained in the same manner as in Example 1 except that the cellulose powder having a whiteness of 80% or more was replaced with 0.5 part by weight. Table 2 shows the results.

Comparative Example 2 The procedure of Example 2 was repeated except that the amount of cellulose powder having a whiteness of 80% or more was changed to 160 parts by weight. As a result, pellets could not be obtained and a flat plate could not be formed. Table 2 shows the results
Shown in

Comparative Example 3 As an ABS resin, MI produced by an emulsion polymerization method was 2.5
Acrylonitrile-butadiene-styrene copolymer of 0 g / 10 min (25% by weight of acrylonitrile component in polymer component (A) excluding components insoluble in a mixture of methyl ethyl ketone and methanol 7: 3) The reduced viscosity (ηsp / c) of the united component (A) is 0.62 dl / g.
And the average particle size of the rubbery polymer component is 0.25 μm
And does not contain rubber particles having a salami-like structure. ), Pellets were obtained in the same manner as in Example 1, and the flat molded product was evaluated. Table 2 shows the results.

Comparative Example 4 Pellets were obtained in the same manner as in Example 1 except that commercially available wood flour having a whiteness of 80% or less was used. Table 2 shows the results
Shown in

[0045]

[Table 2]

[0046]

By implementing the present invention, it is possible to provide a woodgrain-like resin molded product having an excellent woody feel, which is extremely valuable from an industrial and global environmental point of view.

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[Procedure amendment]

[Submission date] October 23, 1998 (1998.10.
23)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

The acrylonitrile component in the polymer component (A) obtained by removing the components insoluble in the mixture of methyl ethyl ketone and methanol 7: 3 from the ABS resin of the present invention is 10-3.
0% by weight and the reduced viscosity (η) of the polymer component (A).
sp / c) is 0.40 to 0.90 dl / g, preferably 0.40 to 0.80 dl / g, and more preferably 0.45 to 0.75 dl / g. The reduced viscosity is 0.
If it is less than 40 dl / g, the impact strength is remarkably reduced, so that it is not preferable. If it exceeds 0.90 dl / g, the fluidity is reduced, the molding temperature is increased, and the hue is deteriorated. Here, the reduced viscosity refers to a solution obtained by precisely weighing 0.25 g of the sea-phase component (S) and dissolving it in 50 ml of dimethylformamide for 2 hours using an Ubbelohde viscometer with a solvent flowing time of 20 to 100 seconds. Te a value obtained by measuring at 30 ° C. environment, reduced viscosity determined by falling seconds of the solvent (t ₀₎ by the following equation from falling seconds of the solution (t) (equation 1).

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

[0013]

## EQU1 ## Reduced viscosity (ηsp / c) = ｛(t / t ₀ ) −
1｝ /0.5

Continued on the front page F-term (reference) 4F074 AA03 AA12D AA13D AA32D AA35 AA49D AA66 AA70 AA71 AB04 AB05 AD12 AE01 AG06 BA18 BC01 CA22 CC22X CC32X DA02 DA23 DA24 4J002 AB01X BB033 BB123 BD04 CF03 DA023 003 DE027 DE096 DE106 DE116 DE136 DE146 DE236 DG026 DG046 DJ006 DJ036 DJ046 DJ056 EA017 EB067 EQ017 EV267 FD096 FD327

Claims (3)

[Claims] (1) Cellulose powder 1 having whiteness of 80% or more
To 60% by weight and 40 to 99% by weight of an acrylonitrile-butadiene-styrene copolymer resin (hereinafter referred to as ABS resin)
(2) 3 to 100 parts by weight of the resin composition comprising
Resin composition 0.1-1 comprising 20% by weight of a coloring agent and 80-97% by weight of a resin which is not completely compatible with the ABS resin
A woodgrain-like resin molded product having a specific gravity of 0.5 to 1.0 obtained by mixing and molding 0 parts by weight and (3) 0.01 to 1 part by weight of a foaming agent. 2. The ABS resin according to claim 1, which dissolves a rubber-like polymer synthesized by solution polymerization, and comprises at least a styrene monomer and an acrylonitrile monomer, and if necessary, said monomer. A solution comprising another copolymerizable monomer is prepared by bulk polymerization and / or solution polymerization.
The acrylonitrile component in the polymer component (A), which is a BS resin, excluding components insoluble in a mixture of methyl ethyl ketone and methanol 7: 3, is 10 to 30% by weight, and the polymer component (A) Reduced viscosity (ηsp / c)
Is 0.4 to 0.9 dl / g, and the average particle diameter of the rubber particles composed of the rubbery polymer component is 0.4 to 4 μm, and 50% or more of the rubber particles having a diameter of 0.4 μm or more is 0.1 μm. 1 μm
A woodgrain-like structure having a salami-like structure containing the above-described cell diameters and having a cell diameter area occupying 50% or more of the total area of the rubber particles and forming a dispersed phase in a ratio of 10 to 35% by weight. Resin molding. 3. A woodgrain-like resin molded product wherein the resin which is not completely compatible with the ABS resin according to claim 1 is an aromatic polycarbonate.