JP2001146543A - Thermoplastic resin composition having excellent processibility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problems concerning the drawdown at blow molding, gum at extrusion molding and expansion failure at extrusion expansion molding of ABS resins. SOLUTION: A methacrylate two-step polymer having a specific composition and a specific molecular weight, i.e., a specific relative viscosity, is mixed with an ABS resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an ABS resin composition having excellent moldability.

[0002]

2. Description of the Related Art ABS resin is widely used as a molding material having excellent mechanical properties and a balance of properties such as heat resistance and solvent resistance. Conventionally, injection molding has been mainly used as a processing method of an ABS resin, but blow molding for obtaining a hollow molded body, and extrusion molding for obtaining a deformed molded article or a foam molded article have also been widely used as a processing method. I have. Conventionally, in order to improve the flowability and the like in injection molding as the processability of an ABS resin, it has been practiced to lower the molecular weight of the ABS resin or to lower the melt viscosity by adding a lubricant.

[0003]

However, it is not always necessary to lower the melt viscosity as described above in order to improve foaming defects during foam molding, such as drawdown which becomes a problem in blow molding and eyes which become a problem in extrusion molding. It was not the preferred method. An object of the present invention is to provide an ABS resin composition in which the drawdown in the blow molding of the ABS resin and the foaming defect in the foam molding are improved.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above-mentioned object, and as a result, a methacrylate resin polymer having a specific composition and a specific molecular weight, that is, a specific specific viscosity, has been added to an ABS resin. The present inventors have found that by mixing, it is possible to improve drawdown in blow molding and to improve poor foaming in extrusion foaming, and the present invention.

That is, the present invention relates to (A) ABS resin 1
00 parts by weight, (B) 50 to 80% by weight of methyl methacrylate, 50 to 20% by weight of an alkyl methacrylate having an alkyl group having 2 to 8 carbon atoms, and a vinyl monomer 0 to 10 copolymerizable therewith. 60 to 95 parts by weight of a monomer mixture (b-1) consisting of 20% by weight is polymerized, and at least one selected from alkyl methacrylate and alkyl acrylate excluding methyl methacrylate in the presence of the polymer latex. A monomer mixture comprising 20 to 80% by weight of a monomer, 80 to 20% by weight of methyl methacrylate, and 0 to 20% by weight of a vinyl monomer copolymerizable therewith (b-
2) A methacrylate polymer obtained by polymerizing 40 to 5 parts by weight of a methacrylate polymer having a specific viscosity of 2 to 5 at 30 ° C. obtained by dissolving 0.4 g of the polymer in 100 ml of toluene. The thermoplastic resin composition according to claim 1, wherein the thermoplastic resin composition comprises 1 to 20 parts by weight (claim 1), and the latex of the methacrylate polymer has a particle size of 1000 ° or less. Body mixture (b-
The alkyl methacrylate having an alkyl group having 2 to 8 carbon atoms in 1) is butyl methacrylate.
The present invention relates to the thermoplastic resin composition described in claim 3.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The ABS resin (A) used in the present invention is selected from a vinyl cyanide compound, an aromatic vinyl compound and an alkyl (meth) acrylate in the presence of a conjugated diene rubber. It is a graft copolymer (a-1) obtained by polymerizing two or more monomers. Further, if necessary, a copolymer (a-2) obtained by polymerizing two or more monomers selected from a vinyl cyanide compound, an aromatic vinyl compound and a (meth) acrylate ester is contained. be able to.

The composition ratio of the conjugated diene rubber and the monomer in the graft copolymer (a-1) is not particularly limited, but is 5 to 85 parts by weight of the conjugated diene rubber and 95 to 25 parts by weight of the monomer. Is preferred. The composition ratio of the monomer is from 0 to 40 parts by weight of the vinyl cyanide compound, and from 30 to 8 parts of the aromatic vinyl compound.
It is preferably 0 parts by weight, and 0 to 70 parts by weight of alkyl methacrylate or alkyl acrylate. The average particle size of the conjugated diene rubber is not particularly limited, but is 0.05 to 1.
5 μm is preferred.

The composition ratio of the monomer of the copolymer (a-2) is 0 to 35 parts by weight of a vinyl cyanide compound, 50 to 90 parts by weight of an aromatic vinyl compound, 0 to 40 parts by weight of alkyl methacrylate and alkyl acrylate. Part.

The inherent viscosity of the ABS resin (A) (30 ° C.,
N, N dimethylformamide solution) is preferably 0.25 to 2.0 with respect to methyl ethyl ketone soluble matter.

Examples of the conjugated diene rubber include polybutadiene, butadiene-styrene copolymer, butadiene-acrylonitrile copolymer, butadiene-butyl acrylate copolymer and the like.

The vinyl cyanide compound is a compound having one vinylic double bond and one or more cyano groups in the same molecule, and specifically includes acrylonitrile, methacrylonitrile, vinylidene cyanate, 1,2-dicyanoethylene. And the like.

The aromatic vinyl monomer is a compound having one vinylic double bond and one or more benzene nuclei in the same molecule, and specifically, styrene, 4-methoxystyrene, 4-ethoxystyrene, 4-propoxystyrene,
4-butoxystyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 4-ethylstyrene, 2,5-dimethylstyrene, 2-chlorostyrene,
Examples thereof include 3-chlorostyrene, 4-chlorostyrene, 2,4-dichlorostyrene, 4-bromostyrene, 2,5-dichlorostyrene, and α-methylstyrene.

[0013] Alkyl (meth) acrylate is an ester compound of acrylic acid or methacrylic acid, specifically, a carbon such as methyl methacrylate, ethyl methacrylate, butyl methacrylate, methyl acrylate, ethyl acrylate, butyl acrylate, etc. (Meth) acrylic acid esters of alcohols of formulas 1 to 8 and the like can be mentioned.

The polymerization method of the graft copolymer (a-1) and the copolymer (a-2) includes emulsion polymerization, suspension polymerization, solution polymerization, bulk polymerization, emulsion-suspension polymerization, The bulk-suspension polymerization method and the like can be mentioned.

The methacrylate-based polymer (B) which can be blended with the above-mentioned ABS-based resin to remarkably improve its processability is as follows.

It comprises 50 to 80% by weight of methyl methacrylate, 50 to 20% by weight of an alkyl methacrylate having an alkyl group having 2 to 8 carbon atoms, and 0 to 20% by weight of a vinyl monomer copolymerizable therewith. Monomer mixture (b-1)
60 to 95 parts by weight are polymerized, and in the presence of the polymer latex, 20 to 80% by weight of at least one monomer selected from alkyl methacrylate and alkyl acrylate excluding methyl methacrylate, and methyl methacrylate 80 ~
It is a methacrylate-based polymer obtained by polymerizing 20 to 40 parts by weight of a monomer mixture (b-2) composed of 20% by weight and a vinyl-based monomer copolymerizable therewith. As a method for polymerizing the polymer, it is convenient to first carry out emulsion polymerization of the mixture (b-1) and then polymerize the mixture (b-2) with the polymer latex system.

In the mixture (b-1), the carbon number of the acrylic group of the alkyl methacrylate is from 2 to 8 from the viewpoint of processability.
Are preferred, and specific examples thereof include ethyl methacrylate, butyl methacrylate, and 2-ethylhexyl methacrylate. One or more of these alkyl methacrylates can be used. The proportion of the alkyl methacrylate in the mixture (b-1) is 5 to 50% by weight, preferably 1 to 50% by weight.
The content is preferably 5 to 50% by weight, more preferably 20 to 40% by weight, from the viewpoint of the uniformity of the obtained resin composition.

The copolymerizable monomers include aromatic vinyl compounds, unsaturated nitriles, alkyl acrylates,
Examples thereof include alkyl methacrylate having an alkyl group having 9 or more carbon atoms. They can be used alone or in combination of two or more. If the amount used exceeds 20% by weight, the dispersibility of the methacrylate-based polymer obtained is poor, which is not preferred.

If the specific viscosity at 30 ° C. of a solution obtained by dissolving 0.4 g of the polymer in 100 ml of toluene is less than 2, no sufficient effect of improving processability is obtained, and if it exceeds 5, a resin composition obtained is obtained. The product is not uniform and is not preferred.

The particle size of the emulsion polymerization latex of the methacrylate polymer (B) is not particularly limited, but is preferably 1,000 ° or less, 500 ° or more, more preferably 80 ° or more.
0 ° or less and 550 ° or more. If the particle diameter exceeds 1000 °, it is difficult to obtain a sufficient dispersion, and irregularities are observed in the molded product, which is not preferable.

The methacrylate polymer (B) can be produced, for example, by the following method. First, the monomer mixture (b
The polymer corresponding to -1) is polymerized by a method such as emulsification, suspension, or bulking to form a latex, and then the monomer corresponding to the monomer mixture (b-2) is subjected to an emulsion polymerization method. And polymerized by Emulsion polymerization is carried out using the monomer mixture (b-1) in the presence of a suitable medium, an emulsifier and a polymerization initiator, and the monomer mixture (b-
The polymer latex of 1) is obtained. Then, polymerization can be carried out by adding the monomer mixture (b-2).

As the medium used in the emulsion polymerization, water is usually used, as the emulsifier, a known anionic surfactant or nonionic surfactant is used, and as the polymerization initiator, an ordinary water-soluble or water-soluble surfactant is used. An oil-soluble single type or redox type is used.

The polymerization conditions such as polymerization temperature and time are not particularly limited, but may be suitably adjusted so that the specific viscosity at 30 ° C. of a solution obtained by dissolving 0.4 g of the polymer in 100 ml of toluene is 2 to 5. For example, after adding sodium dioctyl sulfosuccinate as a surfactant and about 0.02 part by weight of potassium persulfate as an initiator to 200 parts by weight of water, the temperature is maintained at about 65 ° C., and about 100 parts by weight of a monomer is added. A general condition is a condition of continuously adding over 5 hours.

The amount of the emulsifier and the method of addition may be appropriately adjusted so that the final particle size of the latex is preferably 1000 ° or less, more preferably 800 ° or less. Usually, the initial amount of dioctyl sodium succinate is reduced. Conditions may be employed in which the amount of addition is about 0.5 part or more, and about 0.5 part is further added at the time when the monomer is additionally polymerized by a half amount. This methacrylate-based polymer has a polymer layer of the monomer mixture (b-2) formed so as to cover the surface of the polymer of the monomer mixture (b-1).

The mixing ratio of the ABS resin (A) and the methacrylate polymer (B) is 0.1 to 20 parts by weight, preferably 0.3 to 10 parts by weight, for (B) per 100 parts by weight of (A).
Parts by weight. If the added amount of (B) is less than 0.1 part by weight, no sufficient effect of improving the processability can be obtained, and if it exceeds 20 parts by weight, the viscosity of the resin at the time of processing becomes high and processing becomes difficult.

As a method for mixing the resin composition of the present invention, the components (A) and (B) are each separately produced in advance, and then a conventional blending method such as Henschel mixer,
After mixing using a tumbler etc., a single screw extruder,
A method of shaping with a device used for normal shaping such as a twin screw extruder Banbury mixer to form a resin composition can be adopted. Further, the resin composition of the present invention, a foaming agent used as a normal additive, an antioxidant, a heat stabilizer,
Lightfastness improvers, ultraviolet absorbers, lubricants, plasticizers, release agents,
An antistatic agent, a slidability improving agent, a coloring agent, and the like may be added.

[0027]

The present invention will be described in detail with reference to the following examples.

(Example 1) Pure water 20 was added to a reactor equipped with a stirrer.
0 parts by weight, 1 part by weight of sodium dioctylsulfosuccinate and 0.03 parts by weight of potassium persulfate were charged, oxygen in the space and water was removed by flowing nitrogen, and then the content was heated to 65 ° C. while stirring. did. A monomer mixture (mixture (b-1)) composed of 52 parts by weight of methyl methacrylate and 28 parts by weight of butyl methacrylate was added thereto over 4 hours, and the mixture was heated and stirred for 1 hour to substantially complete the polymerization. Was. Thereafter, a monomer mixture (mixture (b-2)) consisting of 11 parts by weight of butyl acrylate and 9 parts by weight of methyl methacrylate was added over 1 hour, and the contents were kept at 65 ° C. for 1 hour and 30 minutes. After cooling, a methacrylate polymer latex was obtained. An aqueous calcium chloride solution is added to this latex to cause salting out and coagulation, followed by filtration, washing with water, and drying to give a powdery methacrylate polymer (B).
I got The polymerization conversion was 98%. Table 1 shows the particle diameter and specific viscosity η _sp (0.4 g / 100 ml toluene, 30 ° C.) in the latex of the obtained methacrylate polymer obtained by the turbidity method.

As an ABS resin (A), Japan A & L
The ABS resin 100 was used by using a CLASTIC SRE (copolymer of styrene, acrylonitrile and polybutadiene, methyl ethyl ketone-soluble component at 30 ° C., N, N dimethylformamide solution of 0.8) manufactured by Co., Ltd.
Parts by weight and 3 parts by weight of the methacrylate polymer (B) were blended and extruded into pellets to obtain pellets. Using the obtained pellet, die swell,
The drawdown property and the foaming property were evaluated. Table 1 shows the results.
Shown in

[0030] Using a pellet obtained by mixing an ABS resin (A) and a methacrylate copolymer (B) with a small single-screw extruder attached to Labo Plastomill manufactured by Toyo Seiki Co., Ltd. Was extruded for 30 minutes, and the spots on the die were observed. The evaluation of the eyes was determined as follows according to the amount of the precipitate. A: Almost no precipitation. ：: slightly precipitated. Δ: Precipitated. ×: Many precipitates. Extruder specifications Screw: L / D = 20, compression ratio = 2.7, rotation speed: 30 rpm Die: diameter = 5 mm, land = 20 mm Molding temperature: C1 = 210 ° C., C2 = 215 ° C., C3 = 2
20 ° C., dice = 225 ° C. Die swell: Die swell was calculated from the diameter of the above-mentioned extruded product and the die diameter. Foamability: 100 parts by weight of a pellet obtained by mixing the ABS resin (A) and the methacrylate-based copolymer (B) are sprinkled with 0.5 parts by weight of azodicarbonamide manufactured by Eiwa Chemical Co., Ltd. as a foaming agent. Under the same conditions, an extruded round rod-shaped foam molded article was obtained. The expansion ratio was calculated from the following equation. Expansion ratio = (specific gravity of pellet) / (specific gravity of foam molded product) Drawdown property: The pellets of the obtained ABS resin composition are blow-molded with a DA-50 blow molding machine manufactured by Placo Co., Ltd. Was left after injecting a length of about 500 mm (weight of parison: 500 g), and the time required for the parison to separate from the die and drop was measured. ：: The time required for the parison to fall exceeds 60 seconds. Δ: Time required for the parison to fall was 20 to 60 seconds. X: The time until the parison falls is less than 20 seconds. The molding conditions are a parison temperature of 225 ° C., an injection speed (index) of 150, and a screw rotation speed of 60 rpm.

In the composition column in the table, MMA is methyl methacrylate, BMA is butyl methacrylate, EMA is ethyl methacrylate, dodecyl MA is dodecyl methacrylate, B is
A is butyl acrylate, EA is ethyl acrylate, AN
Represents acrylonitrile.

Example 2 A methacrylate polymer was obtained in the same manner as in Example 1 except that 0.01 part by weight of potassium persulfate was used. Particle size in latex and η _sp (0.4
g / 100 ml toluene, 30 ° C.) are shown in Table 1.
Table 1 shows the results of evaluation of die swell, drawdown properties, and foaming properties in the same manner as in Example 1.

Example 3 A methacrylate polymer was obtained in the same manner as in Example 1 except that ethyl methacrylate was used instead of butyl methacrylate. Particle size in latex and η _sp (0.4 g / 100 ml toluene, 30
C) are shown in Table 1. Table 1 shows the results of evaluation of die swell, drawdown properties, and foaming properties in the same manner as in Example 1.

Example 4 A methacrylate polymer was obtained in the same manner as in Example 1 except that 60 parts by weight of methyl methacrylate and 20 parts by weight of butyl methacrylate were used in the mixture (b-1). Particle size and η in latex
Table 1 shows the values of _sp (0.4 g / 100 ml toluene, 30 ° C.). Table 1 shows the results of evaluation of die swell, drawdown properties, and foaming properties in the same manner as in Example 1.

Example 5 A methacrylate polymer was obtained in the same manner as in Example 1 except that the mixture (b-1) used 45 parts by weight of methyl methacrylate and 35 parts by weight of butyl methacrylate. Particle size and η in latex
Table 1 shows the values of _sp (0.4 g / 100 ml toluene, 30 ° C.). Table 1 shows the results of evaluation of die swell, drawdown properties, and foaming properties in the same manner as in Example 1.

Example 6 Example 1 except that the mixture (b-1) was 50 parts by weight of methyl methacrylate, 28 parts by weight of butyl methacrylate, and 2 parts by weight of acrylonitrile.
A methacrylate polymer was obtained in the same manner as described above. Table 1 shows the particle diameter and the value of η _sp (0.4 g / 100 ml toluene, 30 ° C.) in the latex. Table 1 shows the results of evaluation of die swell, drawdown properties, and foaming properties in the same manner as in Example 1.

Example 7 A methacrylate polymer was obtained in the same manner as in Example 1 except that the mixture (b-2) was 5 parts by weight of methyl methacrylate and 15 parts by weight of ethyl acrylate. Particle size in latex and η _sp (0.4 g /
Table 1 shows the value of 100 ml of toluene at 30 ° C.). Table 1 shows the results of evaluation of die swell, drawdown properties, and foaming properties in the same manner as in Example 1.

Example 8 A methacrylate polymer was prepared in the same manner as in Example 1 except that the mixture (b-2) was 9 parts by weight of methyl methacrylate, 9 parts by weight of butyl acrylate, and 2 parts by weight of acrylonitrile. Obtained. Particle size in latex and η _sp (0.4 g / 100 ml toluene, 30
C) are shown in Table 1. Table 1 shows the results of evaluation of die swell, drawdown properties, and foaming properties in the same manner as in Example 1.

Example 9 The mixture (b-1) was composed of 45 parts by weight of methyl methacrylate, 20 parts by weight of butyl methacrylate, and the mixture (b-2) was composed of 15 parts by weight of methyl methacrylate.
A methacrylate polymer was obtained in the same manner as in Example 1 except that the parts by weight and butyl acrylate were 20 parts by weight. Table 1 shows the particle diameter and the value of η _sp (0.4 g / 100 ml toluene, 30 ° C.) in the latex. Table 1 shows the results of evaluation of die swell, drawdown properties, and foaming properties in the same manner as in Example 1.

Example 10 The mixture (b-1) was composed of 58 parts by weight of methyl methacrylate and 32 parts by weight of butyl methacrylate.
In parts by weight, the mixture (b-2) contains 4 parts of methyl methacrylate.
A methacrylate polymer was obtained in the same manner as in Example 1 except that the parts by weight and butyl acrylate were 6 parts by weight. Table 1 shows the particle diameter and the value of η _sp (0.4 g / 100 ml toluene, 30 ° C.) in the latex. Table 1 shows the results of evaluation of die swell, drawdown properties, and foaming properties in the same manner as in Example 1.

Example 11 A methacrylate polymer was obtained in the same manner as in Example 1 except that sodium dioctylsulfosuccinate was 0.3 parts by weight. Particle size in latex and η _sp (0.4 g / 100 ml toluene, 30 ° C.)
Are shown in Table 1. Table 1 shows the results of evaluation of die swell, drawdown properties, and foaming properties in the same manner as in Example 1.
Shown in

Comparative Example 1 A methacrylate polymer was obtained in the same manner as in Example 1 except that the amount of potassium persulfate was 0.1 part by weight. Particle diameter in latex and ηsp (0.4 g /
Table 2 shows the values of 100 ml of toluene at 30 ° C.). Table 2 shows the results of evaluation of die swell, drawdown properties and foaming properties in the same manner as in Example 1.

Comparative Example 2 A methacrylate polymer was obtained in the same manner as in Example 1 except that the amount of potassium persulfate was 0.008 parts by weight. Particle size in latex and η _sp (0.4 g
/ 100 ml toluene, 30 ° C.) are shown in Table 2. Table 2 shows the results of evaluation of die swell, drawdown properties and foaming properties in the same manner as in Example 1.

Comparative Example 3 A methacrylate polymer was obtained in the same manner as in Example 1 except that only 80 parts by weight of methyl methacrylate was used as the mixture (b-1). Table 2 shows the particle diameter and the value of η _sp (0.4 g / 100 ml toluene, 30 ° C.) in the latex. Table 2 shows the results of evaluation of die swell, drawdown properties and foaming properties in the same manner as in Example 1.

Comparative Example 4 A methacrylate polymer was obtained in the same manner as in Comparative Example 3 except that 0.01 part of potassium persulfate was used. Particle size in latex and η _sp (0.4 g /
Table 2 shows the values of 100 ml of toluene at 30 ° C.). Table 2 shows the results of evaluation of die swell, drawdown properties and foaming properties in the same manner as in Example 1.

(Comparative Example 5) In the mixture (b-1), 52 parts by weight of methyl methacrylate and 28 parts by weight of dodecyl methacrylate were used.
A methacrylate polymer was obtained in the same manner as in Example 1 except that parts by weight were used. Particle size and η in latex
Table 2 shows the values of _sp (0.4 g / 100 ml toluene, 30 ° C.). Table 2 shows the results of evaluation of die swell, drawdown properties and foaming properties in the same manner as in Example 1.

Comparative Example 6 A methacrylate polymer was obtained in the same manner as in Example 1 except that the mixture (b-1) used 52 parts by weight of methyl methacrylate and 28 parts by weight of butyl acrylate. Particle size in latex and η _sp (0.
4 g / 100 ml toluene, 30 ° C.) are shown in Table 2. Table 2 shows the results of evaluation of die swell, drawdown properties and foaming properties in the same manner as in Example 1.

(Comparative Example 7) A methacrylate polymer was obtained in the same manner as in Example 1 except that 68 parts by weight of methyl methacrylate and 12 parts by weight of butyl methacrylate of the mixture (b-1) were used. Particle size and η in latex
Table 2 shows the values of _sp (0.4 g / 100 ml toluene, 30 ° C.). Table 2 shows the results of evaluation of die swell, drawdown properties and foaming properties in the same manner as in Example 1.

Comparative Example 8 A methacrylate polymer was obtained in the same manner as in Example 1 except that 35 parts by weight of methyl methacrylate and 45 parts by weight of butyl methacrylate of the mixture (b-1) were used. Particle size and η in latex
Table 2 shows the values of _sp (0.4 g / 100 ml toluene, 30 ° C.). Table 2 shows the results of evaluation of die swell, drawdown properties and foaming properties in the same manner as in Example 1.

Comparative Example 9 Mixture (b-1) was 63 parts by weight of methyl methacrylate, 34 parts by weight of butyl methacrylate, and mixture (b-2) was 1 part by weight of methyl methacrylate, butyl acrylate Example 1 except for 2 parts by weight
A methacrylate polymer was obtained in the same manner as described above. Table 2 shows the particle diameter and the value of η _sp (0.4 g / 100 ml toluene, 30 ° C.) in the latex. Table 2 shows the results of evaluation of die swell, drawdown properties and foaming properties in the same manner as in Example 1.

(Comparative Example 10) The mixture (b-1) was composed of 32 parts by weight of methyl methacrylate and 18 parts by weight of butyl methacrylate.
In parts by weight, the mixture (b-2) contains 2 parts of methyl methacrylate.
A methacrylate-based polymer was obtained in the same manner as in Example 1 except that 5 parts by weight and 25 parts by weight of butyl acrylate were used. Table 2 shows the particle diameter and the value of η _sp (0.4 g / 100 ml toluene, 30 ° C.) in the latex. Table 2 shows the results of evaluation of die swell, drawdown properties and foaming properties in the same manner as in Example 1.

Comparative Example 11 Evaluation was made in the same manner as described above using only an ABS resin without using a methacrylate polymer.
Table 2 shows the results.

[0053]

[Table 1]

[0054]

[Table 2]

[0055]

The resin composition comprising the ABS resin (A) and the specific methacrylate polymer (B) can significantly improve the processability during extrusion molding and blow molding, and is industrially useful.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4J002 BG052 BG062 BN151 4J011 AA08 AC03 BA08 BB07 KA01 KB08 KB19 PA69 PC02 PC06 PC09

Claims (3)

[Claims] (A) 100 parts by weight of an ABS resin,
(B) 50-80% by weight of methyl methacrylate, 2 carbon atoms
Alkyl methacrylate 50 having ~ 8 alkyl groups
Monomer mixture (b-1) 60 to 20% by weight and 0 to 20% by weight of a vinyl monomer copolymerizable therewith.
95 parts by weight are polymerized, and in the presence of the polymer latex, 20 to 80% by weight of at least one monomer selected from alkyl methacrylate and alkyl acrylate excluding methyl methacrylate, 80 to 20% by weight of methyl methacrylate
% By weight and 0 to 2 of a vinyl monomer copolymerizable therewith.
A polymer obtained by polymerizing 40 to 5 parts by weight of a monomer mixture (b-2) consisting of 0% by weight;
methacrylate-based polymer having a specific viscosity of 2 to 5 at 30 ° C. in a solution prepared by dissolving g in 100 ml of toluene.
A thermoplastic resin composition comprising 1 to 20 parts by weight. 2. The thermoplastic resin composition according to claim 1, wherein the latex of the methacrylate polymer has a particle size of 1,000 ° or less. 3. The thermoplastic resin composition according to claim 1, wherein the alkyl methacrylate having an alkyl group having 2 to 8 carbon atoms in the monomer mixture (b-1) is butyl methacrylate.