JPH06145466A - Resin composition having high luster - Google Patents

Abstract

PURPOSE:To obtain the subject composition suitable as molding material, etc., having specified physical properties, excellent moldability, impact resistance and clarity, comprising a specific graft copolymer, a specific copolymer, a higher-fatty acid amide, etc., in a specified ratio. CONSTITUTION:The objective composition comprises (A) 10-95 pts.wt. graft copolymer obtained by polymerizing 40-90 pts.wt. mixture composed of 10-90wt.% aromatic vinyl-based monomer, 1-50wt.% vinyl cyanide-based monomer, etc., in the presence of 10-60 pts.wt. diene-based rubbery polymer having 0.15-0.25mum average particle diameter of rubber-like polymer particles and a particle diameter distribution wherein >=80wt.% rubbery polymer particles satisfy formula I [M is average particle diameter (mum) of rubber particles; X is individual rubber particle diameter (mum)], (B) 5-90 pts.wt. copolymer obtained by polymerizing a mixture composed of 80-40wt.% aromatic vinyl-based monomer, etc., and (C) 0.005-8 pts.wt. higher-fatty acid amide, etc., and difference between intrinsic viscosity [etaA] of the component A and intrinsic viscosity [etaB] of the composition B satisfies formula II.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention has extremely excellent gloss and sharpness, and has a good balance of moldability and impact resistance, and has a gate mark, a flow mark,
The present invention relates to a high-gloss resin composition having a good appearance in which no clouding phenomenon occurs.

[0002]

2. Description of the Related Art A rubber-reinforced styrene resin represented by ABS resin has excellent impact resistance, mechanical properties, molding processability and luster, and is a quasi-engineering plastic having properties intermediate between general-purpose resins and engineering resins. Widely used for automobiles and home appliances.

[0003] On the other hand, in this home electric appliance application, there is an increasing demand for a material having a gloss higher than that of a conventional product, which is not affected by the structure of a molding die and has an excellent appearance of a molded product for the purpose of further increasing the commercial value. There is.

Generally, a method of lowering the concentration of the rubber-like polymer in the resin composition or a method of reducing the particle size of the rubber-like polymer is used for improving the surface gloss. However, this leads to a problem of reduced impact resistance.

Therefore, in order to improve these drawbacks,
Method for defining rubber particle size distribution (Japanese Patent Laid-Open No. 62-17171)
4) and a method of defining the composition of the matrix resin (JP-A-60-11514).

Also, a method of adding polysiloxane to a resin composition using a medium particle diameter rubber or a resin composition combining a small to medium particle diameter rubber and a large particle diameter rubber (JP-A-58-58).
17144, JP 3-124756, JP 3-221550, and JP 3-258851.
Issue) is also proposed.

However, the above-mentioned JP-A-62-1171
According to the methods described in JP-A No. 4 and JP-A No. 60-11514, a resin composition satisfying both surface gloss and impact resistance cannot be obtained.

Further, in the method described in JP-A-58-17144, the average particle size is 0.4 μm by emulsion polymerization.
Since the rubber enlarging step for producing the above-mentioned large particle diameter rubber is required, there are drawbacks that the operation is complicated and the cost is high.

Further, the method of adding polysiloxane described in Japanese Patent Application Laid-Open No. 3-124756 gives a mold having a special gate structure, although a product satisfying both surface gloss and impact resistance can be obtained. It is difficult to sufficiently suppress the gate mark, flow mark, fog phenomenon, etc. that often occur when molding is performed by using or with a complicated shape.

[0010]

The object of the present invention is to solve the above-mentioned drawbacks of the prior art, to have excellent gloss, image clarity and color development, and to have good moldability and impact resistance.
It is an object of the present invention to provide a high-gloss resin composition having a good appearance in which a gate mark, a flow mark and a clouding phenomenon do not occur on the surface of a molded product.

[0011]

The object of the present invention described above is such that the rubbery polymer particles have an average particle size of 0.15 to 0.2.
Aromatic vinyl monomer in the presence of 10 to 60 parts by weight (in terms of solid content) of a rubber polymer latex having a diene diameter of 5 μm, 80% by weight or more of which has a particle size distribution satisfying the following formula (I). Graft copolymer obtained by polymerizing 40 to 90 parts by weight of a monomer mixture comprising 10 to 90% by weight, vinyl cyanide monomer 1 to 50% by weight and unsaturated carboxylic acid alkyl ester 0 to 80% by weight. (A), a copolymer (B) obtained by polymerizing a monomer mixture comprising 80 to 40% by weight of an aromatic vinyl monomer and 20 to 60% by weight of a vinyl cyanide monomer, and a higher fatty acid amide A metal salt compound of a higher aliphatic monocarboxylic acid, a polyhydric alcohol ester of a higher fatty acid or an oxyfatty acid (C), and (A) component 1
0 to 95 parts by weight, (B) component 5 to 90 parts by weight in total 10
A composition comprising 0.005 to 8 parts by weight of the component (C) with respect to 0 part by weight, wherein the intrinsic viscosity [η _A ] of the resin portion in the component (A) and (B) The difference in the intrinsic viscosity [η _B ] of the components is achieved by a high gloss resin composition characterized by satisfying the following formula (II).

0.7 × M ≦ X ≦ 1.3 × M (I) (where, M is the average particle diameter (μm) of the rubber particles, X
Indicates the individual rubber particle diameter (μm). ) 0.02 ≦ [η _B ] − [η _A ] ≦ 0.30 (II)

The diene rubbery polymer which is a constituent of the graft copolymer (A) used in the present invention is preferably a polymer or copolymer containing a conjugated diene as a main component. Of these, the content of conjugated diene is 75% by weight.
Above all, particularly preferably 85% by weight or more. Specifically, polybutadiene, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer, butyl acrylate-
Butadiene copolymer or isoprene rubber can be used.

The average particle size of these diene rubbery polymer latexes needs to be in the range of 0.15 to 0.25 μm, and preferably in the range of 0.17 to 0.22 μm.

Here, when the average particle size of the diene rubbery polymer latex is less than 0.15 μm, the impact resistance of the resin composition is poor, and conversely, when it exceeds 0.25 μm, the surface gloss decreases. Therefore, a satisfactory resin composition cannot be obtained.

The diene rubbery polymer latex used here must have a particle size distribution in which 80% by weight or more of the polymer particles are in a range satisfying the following formula (I). 0.7 × M ≦ X ≦ 1.3 × M (I) (where, M is the average particle diameter (μm) of rubber particles, X
Indicates the individual rubber particle diameter (μm). ) A resin composition having excellent impact resistance and high surface gloss can be obtained only when a rubber latex having a narrow particle size distribution satisfying the above formula (I) is used, and the object of the present invention can be achieved. it can.

The gel content of the diene rubbery polymer latex is preferably 60% by weight or more in consideration of the surface gloss and impact resistance of the resulting composition. Here, the gel content refers to the weight fraction of the toluene insoluble content after coagulating and drying the rubber latex.

As a method for producing these diene rubbery polymer latexes, an ordinary emulsion polymerization method can be adopted. The average particle diameter, the particle diameter distribution and the gel content are set to desired ranges by the amount of water for polymerization, the amount of emulsifier,
This can be achieved by carefully controlling the amount of chain transfer agent, the polymerization temperature, the stirring speed, the polymerization time, and the like.

In the present invention, the monomers which are graft-polymerized in the presence of the diene rubbery polymer latex are aromatic vinyl monomers and vinyl cyanide monomers and, if necessary, unsaturated carboxylic monomers. It is a monomer mixture consisting of an acid alkyl ester.

Aromatic vinyl monomers include styrene, α-methylstyrene, p-methylstyrene, vinyltoluene, t-butylstyrene, o-ethylstyrene,
Examples thereof include o-chlorostyrene and o, p-dichlorostyrene, but styrene is particularly preferable. These can use 1 type (s) or 2 or more types.

Examples of the vinyl cyanide-based monomer include acrylonitrile, methacrylonitrile and ethacrylonitrile, with acrylonitrile being particularly preferred.

As the unsaturated carboxylic acid alkyl ester, an acrylic acid ester and / or a methacrylic acid ester having an alkyl or substituted alkyl group having 1 to 6 carbon atoms is preferable, and one kind or two or more kinds can be used. . Specifically, methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, n-butyl (meth) acrylate, t-butyl (meth) acrylate, (meth) acrylic Examples thereof include acid n-hexyl, cyclohexyl (meth) acrylate, chloromethyl (meth) acrylate, and 2-chloroethyl (meth) acrylate. Among them, methyl (meth) acrylate can be preferably used.

Here, the proportion of the aromatic vinyl monomer is 10 to 90% by weight, preferably 15 to 85, based on all the monomers.
% By weight, more preferably 20 to 82% by weight, and 10
When the amount is out of the range of 90% by weight, the impact resistance of the resin composition becomes poor.

The proportion of vinyl cyanide-based monomer is from 1 to 50% by weight, preferably from 2 to 30% by weight, more preferably from 4 to 25% by weight, based on the total amount of monomers, and less than 1% by weight. Impact resistance of the resin composition deteriorates, and when it exceeds 50% by weight, the surface gloss of the resin composition deteriorates.

If the unsaturated carboxylic acid alkyl ester is used in an amount of 80% by weight or less based on all the monomers, the object of the present invention can be achieved.

The graft copolymer (A) is used in an amount of 10 to 60 parts by weight (in terms of solid content) of the above-mentioned diene rubbery polymer latex, preferably 25 to 55 parts by weight, more preferably 30 to 50 parts by weight. , The monomer mixture 90-40
It can be obtained by emulsion graft polymerization using parts by weight, preferably 75 to 45 parts by weight, more preferably 70 to 50 parts by weight.

When the amount of the diene rubbery polymer latex is less than 10 parts by weight (solid content), the impact resistance of the resin composition is poor, and when it exceeds 60 parts by weight (solid content), the diene rubber is used. Due to poor dispersion of the quality polymer, the surface gloss of the resin composition is significantly reduced.

Various methods can be adopted as the method of adding the components such as the monomer mixture, the emulsifier, the polymerization initiator and the chain transfer agent in the graft polymerization. That is, (1) a method in which the entire amount is added in the initial stage of polymerization, (2) a method in which a part is added in the initial stage and the rest is continuously added at a constant rate,
And (3) a method of adding in two or more times.

There are no particular restrictions on the type of emulsifier, polymerization initiator and chain transfer agent used, and reagents used in ordinary emulsion polymerization can be used. Typical emulsifiers include potassium rosinate, potassium stearate, potassium oleate, and the like, and polymerization initiators include a combination system of organic hydroperoxide and sugar-containing pyrophosphate-ferrous sulfate and persulfate, and the like. Examples of the chain transfer agent include alkyl thiol compounds.

The graft ratio of the graft copolymer (A) thus obtained is preferably 20 to 80% in order to obtain a high-gloss resin composition having excellent impact resistance, and preferably 25 to 50%.
% Is more preferable. The graft ratio can be controlled by adjusting the ratio of the rubbery polymer and the monomer mixture, the type and amount of the polymerization initiator, and the chain transfer agent and amount.

The intrinsic viscosity [η] (measured at 30 ° C.) of the methyl ethyl ketone soluble component of the graft copolymer (A) is preferably 0.25 to 0.58 dl / g, and 0.3 to 0.
53 dl / g is more preferable.

The aromatic vinyl-based monomer which is a constituent of the copolymer (B) used in the present invention is styrene,
α-methylstyrene, p-methylstyrene, t-butylstyrene, vinyltoluene, o-ethylstyrene, o-
Examples include chlorostyrene and o, p-dichlorostyrene, with styrene being particularly preferred. These can use 1 type (s) or 2 or more types.

Examples of vinyl cyanide-based monomers include acrylonitrile, methacrylonitrile and ethacrylonitrile, with acrylonitrile being particularly preferred.

If necessary, a part of the aromatic vinyl monomer may be an unsaturated carboxylic acid alkyl ester such as methyl (meth) acrylate or ethyl (meth) acrylate, N
-Methylmaleimide, N-cyclohexylmaleimide,
It can be substituted with a maleimide-based monomer such as N-phenylmaleimide.

The ratio of each component in the monomer mixture is 80 to 40% by weight of the aromatic vinyl monomer, preferably 7%.
5 to 60% by weight, more preferably 75 to 65% by weight, and a range in which the vinyl cyanide monomer is 20 to 60% by weight, preferably 25 to 40% by weight, more preferably 25 to 35% by weight. Is.

When the amount of the vinyl cyanide-based monomer is less than 20% by weight, the impact resistance of the resin composition is poor, and when it exceeds 60% by weight, the surface gloss and color tone of the resin composition are poor. The intrinsic viscosity [η] of the copolymer (B) (methyl ethyl ketone solvent, measured at 30 ° C) is 0.35 to 0.6 dl.
/ G is preferable, and 0.4 to 0.55 dl / g is more preferable.

The polymerization method of the copolymer (B) is not particularly limited, and known methods such as bulk polymerization method, solution polymerization method, suspension polymerization method and emulsion polymerization method can be used.

In the present invention, the difference between the intrinsic viscosity [η _B ] of the component (B) and the intrinsic viscosity [η _A ] of the resin portion in the component (A) of the graft copolymer ([η _B ]- [Η _A ])
Is 0.02 dl / g or more and 0.30 dl / g or less, preferably 0.05 dl / g or more and 0.
25 dl / g or less, more preferably 0.12 dl / g
It is 0.21 dl / g or less. The difference in intrinsic viscosity is 0.
If it is less than 02 dl / g, the gate mark on the surface of the molded product,
The effect of preventing the generation of flow marks and clouding is not sufficient, and if it exceeds 0.30 dl / g, the impact resistance deteriorates. The intrinsic viscosity of each component or resin portion can be measured under the same conditions (methyl ethyl ketone solvent, 30 ° C.) as in the previous period.

In the emulsion polymerization method, since it is generally known that the graft chain and the non-graft chain have approximately the same chain length, the resin portion in the graft copolymer (A) component is The intrinsic viscosity can be determined for both grafted chains and non-grafted chains.

For the method of separating the graft chain from the trunk polymer in order to obtain the intrinsic viscosity, the conventionally known ozonolysis method and the like (Polymer Papers, vol. 32, No. 7, 1)
975 etc.).

In the present invention, each of the above-obtained polymers is graft copolymer (A) in an amount of 10 to 95 parts by weight, preferably 15 to 95 parts by weight, more preferably 20.
To 95 parts by weight, copolymer (B) 5 to 90 parts by weight, preferably 5 to 85 parts by weight, more preferably 5 to 80 parts by weight, and the total amount of (A) and (B) is 100 parts by weight. It is necessary to mix them so as to become parts. When the content of the graft copolymer (A) is less than 10 parts by weight, the impact resistance of the resin composition becomes poor, and when it exceeds 95 parts by weight,
The effect of preventing the occurrence of gate marks, flow marks, and fog on the surface of the molded product becomes insufficient.

The proportion of the diene rubber polymer in the resin composition is 5 to 30% by weight or less, preferably 10%.
If it is less than 5% by weight, the impact resistance of the resin composition will be poor, and if it exceeds 30% by weight, the rigidity and surface gloss of the resin composition will be poor.

The present invention further relates to the graft copolymer (A)
And 100 parts by weight of the total amount of the copolymer (B), a higher fatty acid amide, a metal salt compound of a higher aliphatic monocarboxylic acid,
0.005 to 8 parts by weight, preferably 0.1 to 7 parts by weight, of the total amount of one or more selected from the group consisting of polyhydric alcohol esters of higher fatty acids or oxyfatty acids,
More preferably, the addition of 0.5 to 5 parts by weight improves the balance of surface gloss, impact resistance and moldability. If the total amount of these is less than 0.005 parts by weight, the effect of improving the balance of surface gloss, impact resistance and moldability is not observed, while if it exceeds 8 parts by weight, the rigidity and heat resistance of the molded product deteriorate. To do.

The higher fatty acid amide used in the present invention has the general formula R ₁ CONHR 'or R ₂ CONHR ".
NHCOR ₃ (however, R ₁ , R ₂ and R ₃ have 8 to 1 carbon atoms)
An alkyl group of 8, R'is hydrogen or an oxymethyl group,
R ″ is represented by — (CH ₂ ) _—n , n = 1 to 2), and examples thereof include stearic acid amide, oleic acid amide, linoleic acid amide, palmitic acid amide, lauric acid amide, methylol amide, methylenebisstearyl amide, , Ethylene bis stearyl amide, etc., but not limited to these, among which stearic acid amide, methylene bis stearyl amide, and eletin bis stearyl amide are preferably used.

As the metal salt compound of a higher aliphatic monocarboxylic acid used in the present invention, an alkali and / or alkaline earth metal salt compound of a higher aliphatic monocarboxylic acid having 18 to 33 carbon atoms is used as a main component. , For example, stearic acid, nonadecanoic acid, lauric acid, carnaube acid, lignoceric acid, cerotic acid, monitor acid, petroselinic acid, oleic acid, erucic acid, linoleic acid and lithium salts, sodium salts and potassium salts of acid mixtures containing these. , Barium salt, magnesium salt, calcium salt,
Examples of the strontium salt compound include magnesium stearate, calcium stearate, barium stearate, sodium montanate, calcium montanate, and sodium erucate. The higher fatty acid or oxyfatty acid polyhydric alcohol ester used in the present invention has 11 to 2 carbon atoms.
6 include, for example, polyglycol esters such as undecanoic acid, lauric acid, tridecanoic acid, myristic acid, palmitic acid, stearic acid, oleic acid, whale oil acid, linoleic acid, linolenic acid and ricinoleic acid, monoglycerides, diglycerides, triglycerides. , Monopentaerythritol ester, dipentaerythritol ester, tripentaerythritol ester, tetrapentaerythritol ester or hydrogenated or semi-cured products of these, and the main component as a mixture of glycerides of these fatty acids. Eggplant natural oils and fats, such as linseed oil, tide oil, corn oil, rapeseed oil, castor oil, safflower oil, cottonseed oil, beef tallow, horse fat, pork fat, sheep fat, sardine oil, various whale oils, hydrogenated oils such as herring oil Or hydrogenated semi-hardened oil.

The method for producing the resin composition of the present invention is not particularly limited, and for example, the graft copolymer (A) and the copolymer (B) are uniformly mixed using a high-temperature stirrer and then sufficiently mixed. Various methods such as a method of melt-kneading with a single-screw or multi-screw extruder having kneading ability can be adopted. Further, pigments and dyes, heat stabilizers, antioxidants, ultraviolet absorbers, light stabilizers, other lubricants or plasticizers, antistatic agents and the like can be added depending on the purpose.

[0047]

EXAMPLES In order to describe the present invention more specifically, examples and comparative examples will be described below, but these examples do not limit the present invention. Unless otherwise specified, "part" means part by weight and "%" means% by weight.

The method for analyzing the polymer properties of the present invention is shown below. Particle size distribution of rubber latex: Measured by sodium alginate method. Graft ratio: Acetone was added to a predetermined amount (m) of the graft copolymer, and the mixture was refluxed for 4 hours. This solution is 8,800ppm
(10,000 G) After centrifugation for 30 minutes, the insoluble matter was filtered. The insoluble matter was dried under reduced pressure at 60 ° C. for 5 hours, and the weight (n) was measured.

The graft ratio was calculated by the following formula. Graft ratio (%) = {[(n)-(m) × L] / [(m) × L]} × 100 where L: rubber content of graft polymer Intrinsic viscosity [η] is methyl ethyl ketone solvent Used, 30
It was measured at ° C.

The resin composition finally obtained was molded by an injection molding method, and then the physical properties were measured by the following test methods. Izod impact strength: 23 ° C according to ASTM D-256
Was measured (with a 1/2 inch notch). Melt viscosity: according to ASTM D-1238, 220 ° C, 1
It was measured under the condition of 0 kg load. Flexural modulus: measured at 23 ° C. according to ASTM D-790. Deflection Temperature Under Load: Measured according to ASTM D-648 (1/4 inch).

Surface gloss: injection molding was performed under the conditions of a cylinder temperature of 230 ° C. and a mold temperature of 30 ° C., and a length of 120 mm × width of 8
A test piece of 0 mm × thickness 3 mm was obtained. Then, the surface reflection light of the molded product was measured at an incident angle of 60 degrees using a digital variable angle gloss meter UGV-5D manufactured by Suga Test Instruments Co., Ltd.

Gate mark: A gate mark generated on the surface of a molded product obtained by injection molding under the conditions of a cylinder temperature of 220 ° C. and a mold temperature of 30 ° C. using a flow mark mold having the shape shown in FIG. The length was determined according to the following criteria from the length (side A) and the degree of conspicuousness (side B). A: The gate mark length is less than 10 mm and is inconspicuous. ◯: Gate mark with a length of 10 mm or more, or a little conspicuous. B: The length of the gate mark is 10 mm or more and it is easily noticeable.

Image clarity: The sharpness of an image when a fluorescent lamp was projected on the surface of a molded article obtained in the same manner as that used for measuring the surface gloss was visually observed and judged according to the following criteria. ◎… The image is clear. ○: The image appears slightly blurry. △: The image appears blurry.

Reference Example 1 "Production of Graft Copolymer A" Glucose prepared by charging a glass reactor with a diene rubbery polymer latex showing the rubber properties shown in Table 1 and further dissolving it in ion-exchanged water while stirring. , Sodium pyrophosphate, ferrous sulfate were charged, and after replacing the inside of the container with nitrogen,
The temperature in the reactor was raised to 65 ° C.

To this mixed solution, a predetermined amount of the monomer and normal octyl mercaptan mixture shown in Table 1 and a potassium olefinate aqueous solution of cumene hydroperoxide were separately added dropwise continuously for 3.5 hours and 5 hours, respectively. After the internal temperature was raised to 75 ° C. and stirring was continued for 1 hour to complete the reaction, 2,6-di-tert-butylparacresol was added as an antioxidant. The polymerization rate was 96.4%. The resulting graft copolymer latex is coagulated with sulfuric acid, neutralized with NaOH, washed with water, dehydrated,
It was dried to obtain a graft copolymer (A-1). The graft ratio of this graft copolymer was 41%, and the intrinsic viscosity of the methyl ethyl ketone soluble component was 0.33 dl / g. With the same formulation, the graft copolymers (A-2) to (A-11)
Got Table 1 shows the graft ratio and the intrinsic viscosity of the methyl ethyl ketone-soluble component.

Reference Example 2 "Production of Copolymer B" B-1: A monomer mixture comprising 72% styrene and 28% acrylonitrile was bulk polymerized to produce a copolymer B-1. The intrinsic viscosity of the methyl ethyl ketone soluble component is 0.
It was 52 dl / g. B-2: Copolymer B-2 was produced by suspension-polymerizing a monomer mixture consisting of 76% styrene and 24% acrylonitrile. Methyl ethyl ketone soluble component has an intrinsic viscosity of 0.42
It was dl / g.

Example 1 The graft copolymer (A), the copolymer (B) and the ethylenebisstearylamide (C-
1) was blended at the blending ratios shown in Table 2, and 0.1 part of tris (mono, dinonylphenyl) phosphite was further added and mixed by a Henschel mixer.
Next, after extruding with a 40 mmφ extruder at a kneading temperature of 220 ° C. and pelletizing, a molding temperature of 230 ° C. and a mold temperature of 60 ° C.
The sample was subjected to injection molding under the conditions described above, and each test piece was prepared to evaluate the physical properties. Further, according to the above-mentioned method, the surface gloss, gate mark and image clarity were evaluated. The results are shown in Table 3. As is clear from these results, it is found that the gloss and the surface appearance are excellent, and the balance between impact resistance and fluidity (moldability) is good. Also, the bending elastic modulus is 27,000 kg /
cm ² and deflection temperature under load of 90 ° C. were excellent.

Examples 2 to 6 The same as Example 1 except that the kind or amount of the component (C) selected from the graft copolymer (A), the copolymer (B) and the higher fatty acid amide was changed. To produce a resin composition, and each test piece was obtained. The formulations and evaluation results of these resin compositions are shown in Tables 2 and 3. As is clear from these results, all of them were excellent in gloss and surface appearance, and had a good balance between impact resistance and fluidity.

[0059]

[Table 1]

[Table 2]

[Table 3] The following is clear from the examples and comparative examples.

That is, the resin composition of the present invention (Example 1)
~ 8) has high gloss on the surface of the molded product,
Since the image clarity is excellent and the gate mark is unlikely to occur, it is possible to obtain an excellent surface appearance even when a mold having a special gate structure is used. It also has an excellent balance of impact resistance and moldability.

On the other hand, those in which the average particle diameter of the rubbery polymer in the graft copolymer (A) deviates from the specified values (Comparative Examples 2 and 3), the surface gloss and surface appearance are deteriorated, or Impact resistance decreases. Further, in the case where the rubber particle diameter distribution of the rubber-like polymer in the graft copolymer (A) does not satisfy the specified formula (Comparative Example 4), the surface gloss and the surface appearance are deteriorated. In the case where the difference in intrinsic viscosity between the graft copolymer (A) component and the copolymer (B) component does not satisfy the specified formula (Comparative Example 5), gate marks are generated, the surface appearance is poor, and the fluidity is also poor. Inferior

(C) selected from higher fatty acid amides
If the compounding amount of the components is less than the specified value (Comparative Example 6),
The surface gloss and surface appearance were inferior. On the other hand, (C)
In the case where the compounding amounts of the components exceeded the specified values (Comparative Example 7), the surface gloss and impact resistance were excellent, but the flexural modulus was 23,000 kg / cm ² , and the deflection temperature under load was 80 ° C., which was poor. In the case where the blending ratio of the graft copolymer (A) was less than 10 parts by weight (Comparative Example 1), the impact resistance was significantly lowered.

[0063]

EFFECT OF THE INVENTION The resin composition of the present invention provides excellent surface gloss without impairing the balance between moldability and impact resistance, and is excellent in sharpness and appearance near the gate.
It is preferably used as a molding material for exterior parts of household electric appliances.

[Brief description of drawings]

FIG. 1 is a schematic view showing a molded product used for evaluation of a gate mark.

[Explanation of symbols]

 Side A: Length of gate mark Side B: Ease of notice of gate mark

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location C08L 51/04 LLB 7142-4J

Claims (1)

[Claims] 1. The average particle size of the rubber-like polymer particles is 0.1.
Aromatic vinyl in the presence of 10 to 60 parts by weight (in terms of solid content) of a rubber polymer latex having a diene diameter of 5 to 0.25 μm, 80% by weight or more of which has a particle size distribution satisfying the following formula (I). 40 to 90 parts by weight of a monomer mixture consisting of 10 to 90% by weight of a system monomer, 1 to 50% by weight of a vinyl cyanide monomer, and 0 to 80% by weight of an unsaturated carboxylic acid alkyl ester. Copolymer (B) obtained by polymerizing a graft copolymer (A), a monomer mixture consisting of 80 to 40% by weight of an aromatic vinyl monomer and 20 to 60% by weight of a vinyl cyanide monomer. And higher fatty acid amides, metal salt compounds of higher aliphatic monocarboxylic acids,
Consists of at least one (C) selected from the group consisting of polyhydric alcohol esters of higher fatty acids or oxyfatty acids, 10 to 95 parts by weight of (A) component, 5 to 90 (B) component.
A composition comprising 0.005 to 8 parts by weight of the component (C) with respect to 100 parts by weight in total,
A high-gloss resin composition, wherein the difference between the intrinsic viscosity [η _A ] of the resin portion in the component (A) and the intrinsic viscosity [η _B ] of the component (B) satisfies the following formula (II). 0.7 × M ≦ X ≦ 1.3 × M (I) (where, M is the average particle diameter (μm) of rubber particles, X
Indicates the individual rubber particle diameter (μm). ) 0.02 ≦ [η _B ] − [η _A ] ≦ 0.30 (II)