JP2000290461A - Methyl methacrylate resin composition - Google Patents

Abstract

(57) [Problem] To provide a methyl methacrylate resin composition having excellent surface properties of a molded article and improved workability. SOLUTION: Methyl methacrylate resin (A) 10
The polytetrafluoroethylene-containing mixed powder (B) composed of polytetrafluoroethylene particles having a particle diameter of 10 μm or less and an organic polymer is contained in an amount of 0.0001 to 20 parts by weight based on 0 part by weight. A methyl methacrylate-based resin composition blended to be a part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a methyl methacrylate resin composition having improved processability.

[0002]

2. Description of the Related Art Methyl methacrylate resin has high rigidity, excellent transparency, and excellent weather resistance. Therefore, it is molded by injection molding such as a lamp cover, a meter cover, an eyeglass lens, and a light guide. In addition, it is widely used as an extruded plate such as a signboard or a nameplate by extrusion molding.
In order to make the methyl methacrylate-based resin into more various molded articles, molding by blow molding, irregular (co) extrusion molding, foam molding, or the like is desired. However, the methyl methacrylate resin generally has the most important property in applying these processing methods, that is, low melt tension. Therefore, the drawdown is severe during blow molding or irregular (co) extrusion molding, and foam molding is performed. It is extremely difficult to obtain a molded article of a desired shape by these molding methods, for example, sometimes a uniform cell cannot be obtained. As this improvement method, a method using a high polymerization degree methyl methacrylate resin having a high intrinsic viscosity, a method using a branched methyl methacrylate resin, a method of blending another thermoplastic resin, a method of further adding a filler, and the like However, all of them have little improvement effect and are insufficient as materials for these processing methods.

JP-A-3-183524 discloses an attempt to improve processability by blending polytetrafluoroethylene with a thermoplastic resin such as a methyl methacrylate resin. However, polytetrafluoroethylene has poor dispersibility with respect to a general thermoplastic resin containing no halogen atom, and this method requires a large amount of polytetrafluoroethylene to improve processability, There is a disadvantage that the surface properties of the molded article are impaired.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a methyl methacrylate-based resin composition having excellent surface properties of a molded article and improved workability.

[0005]

Means for Solving the Problems In order to solve the above problems, as a result of intensive studies, it has been found that a polytetrafluoroethylene-containing mixed powder comprising polytetrafluoroethylene particles having a particle diameter of 10 μm or less and an organic polymer is used. By adding to the methyl acid-based resin, the melt tension is remarkably improved, and it is possible to obtain a molded product having good workability in blow molding, irregular (co) extrusion molding, foam molding, etc., and excellent surface properties. Heading reached the present invention.

The gist of the present invention is to provide a polytetrafluoroethylene-containing mixed powder comprising an organic polymer and polytetrafluoroethylene particles having a particle diameter of 10 μm or less with respect to 100 parts by weight of a methyl methacrylate resin (A). (B)
However, the polytetrafluoroethylene component is 0.0001 to
It is in a methyl methacrylate resin composition blended to be 20 parts by weight.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The methyl methacrylate resin (A) used in the present invention contains methyl methacrylate as a constituent unit in an amount of 50% by weight or more, preferably 70% by weight or more. 50% by weight
As long as it is contained as described above, a part thereof may be replaced with a monofunctional unsaturated monomer copolymerizable with methyl methacrylate. When the content of methyl methacrylate is less than 50% by weight, transparency and mechanical strength, which are characteristics of so-called polymethyl methacrylate, are hardly exhibited.

Examples of the copolymerizable monofunctional unsaturated monomer include methacrylates such as ethyl methacrylate, propyl methacrylate, butyl methacrylate, and benzyl methacrylate: methyl acrylate, ethyl acrylate, acrylic Acrylic esters such as propyl acrylate, butyl acrylate and 2-ethylhexyl acrylate:
Unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid and itaconic acid, and acid anhydrides such as maleic anhydride and itaconic anhydride: 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, monoglycerol acrylate, Esters having a hydroxyl group such as 2-hydroxyethyl methacrylate, hydroxypropyl methacrylate, and monoglycerol methacrylate: acrylamide, methacrylamide, and diacetone acrylamide. Further, nitriles such as acrylonitrile and methacrylonitrile; nitrogen-containing monomers such as dimethylaminoethyl methacrylate; epoxy-containing monomers such as allyl glycidyl ether, glycidyl acrylate, and glycidyl methacrylate: styrene and α-methylstyrene And the like.

The polytetrafluoroethylene-containing mixed powder (B) used in the present invention is composed of polytetrafluoroethylene particles having a particle diameter of 10 μm or less and an organic polymer. It is necessary that these do not form aggregates. As such a polytetrafluoroethylene-containing mixed powder, an aqueous dispersion of polytetrafluoroethylene particles having a particle diameter of 0.05 to 1.0 μm and an aqueous dispersion of organic polymer particles are mixed and coagulated or spray-dried. After polymerization of the monomers constituting the organic polymer in the presence of an aqueous dispersion of polytetrafluoroethylene particles having a particle diameter of 0.05 to 1.0 μm, or solidification or spray drying In a dispersion obtained by mixing an aqueous dispersion of polytetrafluoroethylene particles and an aqueous dispersion of organic polymer particles having a particle diameter of 0.05 to 1.0 μm, What is obtained by carrying out emulsion polymerization of the monomer which has a bond, and pulverizing by coagulation or spray drying is preferable. The aqueous dispersion of polytetrafluoroethylene particles having a particle size of 0.05 to 1.0 μm used for obtaining the polytetrafluoroethylene-containing mixed powder (B) used in the present invention is obtained by emulsion polymerization using a fluorinated surfactant. Obtained by polymerizing a tetrafluoroethylene monomer.

[0010] In the emulsion polymerization of polytetrafluoroethylene particles, copolymer components such as hexafluoropropylene, chlorotrifluoroethylene, fluoroalkylethylene, and perfluoroalkylvinyl ether are contained as long as the properties of polytetrafluoroethylene are not impaired. Fluorinated olefins and fluorinated alkyl (meth) acrylates such as perfluoroalkyl (meth) acrylate can be used. The content of the copolymer component is preferably 10% by weight or less based on tetrafluoroethylene.

Commercially available raw materials for the polytetrafluoroethylene particle dispersion include Fluon AD-1 and AD-936 manufactured by Asahi Glass Fluoropolymer Co., Ltd., and Polyflon D-1 and D-2 manufactured by Daikin Industries, and Mitsui DuPont Fluorochemical Co., Ltd. Teflon 30J manufactured by the company can be cited as a representative example.

The organic polymer constituting the polytetrafluoroethylene-containing mixed powder used in the present invention is not particularly limited, but methacrylic acid is preferred from the viewpoint of dispersibility when blended with a methyl methacrylate resin. It is preferable that the resin has a high affinity with the methyl resin.

Specific examples of the monomer for forming the organic polymer include styrene, α-methylstyrene, p-methylstyrene, o-methylstyrene, t-butylstyrene, o-ethylstyrene and p-methylstyrene. Aromatic vinyl monomers such as chlorostyrene, o-chlorostyrene, 2,4-dichlorostyrene, p-methoxystyrene, o-methoxystyrene, 2,4-dimethylstyrene; methyl acrylate, methyl methacrylate, acrylic Ethyl acrylate, ethyl methacrylate, butyl acrylate, butyl methacrylate,
2-ethylhexyl acrylate, methacrylic acid-2-
(Meth) acrylic ester monomers such as ethylhexyl, dodecyl acrylate, dodecyl methacrylate, tridecyl acrylate, tridecyl methacrylate, octadecyl acrylate, octadecyl methacrylate, cyclohexyl acrylate, and cyclohexyl methacrylate; acrylonitrile, methacrylonitrile Vinyl cyanide monomers such as maleic anhydride; α, β-unsaturated carboxylic acids such as maleic anhydride; maleimide monomers such as N-phenylmaleimide, N-methylmaleimide, N-cyclohexylmaleimide; glycidyl methacrylate Epoxy group-containing monomers such as vinyl methyl ether and vinyl ethyl ether; vinyl ether monomers such as vinyl acetate and vinyl butyrate; ethylene and propylene;
Olefin monomers such as isobutylene; diene monomers such as butadiene, isoprene, and dimethylbutadiene; These monomers can be used alone or in combination of two or more.

Among these monomers, preferred are aromatic vinyl monomers, (meth) acrylate monomers, and vinyl cyanide monomers from the viewpoint of affinity with methyl methacrylate resin. 1 selected from the group consisting of monomers
Monomers containing at least 30% by weight of at least one kind of monomer can be mentioned. Particularly preferred are monomers containing at least 30% by weight of one or more monomers selected from the group consisting of styrene, methyl methacrylate, and n-butyl acrylate.

The content of polytetrafluoroethylene in the polytetrafluoroethylene-containing mixed powder used in the present invention is preferably 0.1% by weight to 90% by weight. If it is less than 0.1% by weight, the effect of improving the moldability becomes insufficient, and if it exceeds 90% by weight, the surface appearance may be adversely affected.

The polytetrafluoroethylene-containing mixed powder used in the present invention is poured into hot water in which a metal salt such as calcium chloride or magnesium sulfate is dissolved, salted out, solidified, and dried. Or powdered by spray drying.

The ordinary polytetrafluoroethylene fine powder becomes an aggregate of 100 μm or more in the step of recovering the powder from the state of the particle dispersion, so that it is difficult to uniformly disperse it in the thermoplastic resin. On the other hand, the polytetrafluoroethylene-containing mixed powder used in the present invention has extremely excellent dispersibility in a methyl methacrylate-based resin because polytetrafluoroethylene alone does not form a domain having a particle diameter of more than 10 μm. ing. As a result, the methyl methacrylate-based resin composition of the present invention is such that polytetrafluoroethylene is efficiently made into fine fibers in the methyl methacrylate-based resin, and various moldability is excellent, as well as excellent surface properties. Becomes

In the resin composition of the present invention, the polytetrafluoroethylene-containing mixed powder (B) has a polytetrafluoroethylene component in an amount of 0.0001 to 20 per 100 parts by weight of the methyl methacrylate resin (A). It is blended so as to be parts by weight. If it is less than 0.0001 part, the effect of improving workability is poor, and if it exceeds 20 parts by weight, the fluidity at the time of melting may be too low.

The methyl methacrylate resin composition of the present invention may contain, if necessary, a releasing agent, an ultraviolet absorber, a coloring agent, an antioxidant, a heat stabilizer, a plasticizer, a filler, a dye, a pigment, and a light diffusion. There is no problem even if various additives that can be added to a general acrylic resin such as a material are mixed, and they can be added at the time of kneading or during the polymerization of each polymer.

Further, the methyl methacrylate resin composition of the present invention may further comprise a polyphenylene ether resin, an aromatic polyester resin, a polyamide resin, a polycarbonate resin, an ABS resin, if necessary, in addition to the above-mentioned methyl methacrylate resin (A). , Styrene resin, vinyl chloride resin,
Polyolefin resins such as polyethylene and polypropylene, and ethylene / propylene copolymers, ethylene /
Butene-1 copolymer, ethylene / propylene / dicyclopentadiene copolymer, ethylene / propylene / 5-ethylidene-2-rubbornene copolymer, ethylene / propylene / 1,4-hexadiene copolymer, ethylene / vinyl acetate By appropriately blending an olefin-based rubber such as a copolymer or an ethylene / butyl acrylate copolymer, more desirable physical properties and characteristics can be adjusted.

A predetermined amount of each of the above-mentioned essential components and, if desired, optional components is blended and kneaded with a usual kneader such as a roll, a Banbury mixer, a single-screw extruder or a twin-screw extruder to prepare a composition. However, usually, it is preferable to form a pellet. Alternatively, the composition of the present invention may be prepared by diluting a masterbatch containing the polytetrafluoroethylene-containing mixed powder (B) at a high concentration with a methyl methacrylate resin (A).

The thus obtained methyl methacrylate-based resin composition of the present invention has high melt elasticity.
Blow molding, profile (co) extrusion molding, drawdown resistance in thermoforming, uniformity of cells during foam molding, calender moldability, etc. are improved and the molding processability is excellent. In addition, there is no macro-aggregate of polytetrafluoroethylene, and the molded product has excellent surface properties.

The method for processing the methyl methacrylate resin composition of the present invention is not particularly limited, and examples thereof include blow molding, irregular (co) extrusion molding, thermoforming, foam molding, calender molding, injection molding, and melt spinning. Can be mentioned.

Useful molded articles obtained by using the methyl methacrylate resin composition of the present invention are not particularly limited, but hollow molded articles, sheets, thermoformed articles, pipes, square bars, irregularly shaped articles, foams , A film, an injection molded product, a fiber, and the like.

Hereinafter, the present invention will be described with reference to Examples.
The present invention is not limited to these.

[0026]

EXAMPLES In each description, "parts" indicate parts by weight, and "%" indicates% by weight.
And physical properties are measured by the following methods.

(1) Solid content concentration: 170 ° C. of the particle dispersion
And dried for 30 minutes.

(2) Particle size distribution, weight average particle size: A solution obtained by diluting a particle dispersion with water was used as a sample solution, and a dynamic light scattering method (ELS800, manufactured by Otsuka Electronics Co., Ltd., temperature: 25 ° C., scattering angle: 90) Degree).

(3) Zeta potential: 0.01 for particle dispersion
A sample diluted with a mol / l NaCl aqueous solution was used as a sample solution and measured by electrophoresis (ELS800 manufactured by Otsuka Electronics Co., Ltd., temperature 25 ° C., scattering angle 10 °).

(4) Melt tension: Using a capillary rheometer (Toyo Seiki Capillograph), resin temperature 2
Methyl methacrylate-based resin was discharged at 30 ° C., orifice L / D = 10 mm / 1 mm, piston descending speed 10 mm / min, and the load at the time of drawing at a drawing speed of 4 m / min was measured with a load cell.

(5) Thermoformability: The pellets obtained in each of Examples and Comparative Examples were melt-kneaded at a resin temperature of 265 ° C. by an extruder (single screw, screw diameter 40 mm, manufactured by Tanabe Plastic Co., Ltd.), and then T-die 3mm through 3 polishing rolls
A sheet having a thickness of 20 cm was obtained. 30c of the obtained sheet
m × 20 cm, heated to 150 ° C. in an oven, and pushed up using a push-up molding machine (Model TF-300, Osaka Sheet Machine Works, push-up area 10c)
m × 5 cm, thrust height 10 cm) to obtain a molded product.

Sheet thickness measurement: The thickness of the sheet at the point A 4.5 cm below the center of the long side at the top of the molded article and at the point B 4.5 cm below the center of the short side is measured using an ultrasonic thickness gauge ( PANAMETRICS ULTRASONIC GAGE MODEL5
222).

Surface appearance: The surface appearance of the molded article was visually observed and judged according to the following criteria.

：: No lumps on the surface ×: No lumps on the surface Reference Example 1 <Polytetrafluoroethylene-containing powder (B-
Production of 1)> In a separable flask equipped with a stirring blade, a condenser, a thermocouple and a nitrogen inlet, 190 parts of distilled water, 1.5 parts of sodium dodecylbenzenesulfonate, 100 parts of methyl methacrylate, 0.5 part of t-butyl peroxide 0.5 Charge the department,
The temperature was raised to 50 ° C. under a nitrogen stream. Then, ferrous sulfate (II)
0.001 part, disodium ethylenediaminetetraacetate 0.003 part, Rongalite salt 0.24 part, distilled water 10
Of the mixture was added to initiate radical polymerization. After the end of the heat generation, the temperature in the system was maintained at 50 ° C. for 1 hour to complete the polymerization to obtain a methyl methacrylate polymer particle dispersion (hereinafter referred to as P-1).

The solid content concentration of P-1 was 33.3%, the particle size distribution showed a single peak, and the weight average particle size was 91 n.
m, and the surface potential was -32 mV.

On the other hand, as a polytetrafluoroethylene-based particle dispersion, Fluon AD manufactured by Asahi Glass Fluoropolymers Co., Ltd.
936 was used. AD936 has a solid content of 63.0%
And containing 5 parts of polyoxyethylene alkylphenyl ether per 100 parts of polytetrafluoroethylene. The particle size distribution of AD936 shows a single peak, the weight average particle size is 290 nm, and the surface potential is −
20 mV.

To 833 parts of AD936, 1167 parts of distilled water was added to obtain a polytetrafluoroethylene particle dispersion F-1 having a solid concentration of 26.2%. F-1 contains 25% of polytetrafluoroethylene particles and 1.2% of polyoxyethylene nonylphenyl ether.

160 parts of F-1 (40 parts of polytetrafluoroethylene) and 181.8 parts of P-1 (60 parts of polymethyl methacrylate) were separated by a separator equipped with a stirring blade, a condenser, a thermocouple, and a nitrogen inlet. Bull flask,
The mixture was stirred at room temperature for 1 hour under a nitrogen stream. After that, 80
C. and kept for 1 hour. No solid matter was separated through a series of operations, and a uniform particle dispersion was obtained. The solid content concentration of the particle dispersion was 29.2%, the particle size distribution was relatively broad, and the weight average particle size was 165 nm.

341.8 parts of this particle dispersion was poured into 700 parts of 85 ° C. hot water containing 5 parts of calcium chloride to separate a solid, filtered and dried to obtain a mixed powder containing polytetrafluoroethylene (B -1) 98 parts were obtained.

After B-1 was shaped into a strip shape at 250 ° C. by a press molding machine, ultrathin sections were observed with a microtome without staining, and observed with a transmission electron microscope. Although polytetrafluoroethylene is observed as a dark area, 10 μm
No aggregates larger than m were observed.

Reference Example 2 <Production of mixed powder containing polytetrafluoroethylene (B-2)> A separable flask equipped with a stirring blade, a condenser, a thermocouple, a nitrogen inlet, and a dropping funnel was used in Reference Example 1. F
-1 to 160 parts (polytetrafluoroethylene 40
Parts), 1.0 part of dodecylbenzenesulfonic acid, 7 parts of distilled water
0 parts were charged, and the temperature was raised to 80 ° C. under a nitrogen stream. Next, 0.001 part of iron (II) sulfate, 0.003 part of disodium ethylenediaminetetraacetate, 0.24 of Rongalit salt
, A mixture of 48 parts of n-butyl acrylate, 12 parts of styrene, and 0.3 part of tertiary butyl peroxide was added dropwise from a dropping funnel over 90 minutes to allow radical polymerization to proceed. After completion of the dropwise addition, the internal temperature was maintained at 80 ° C. for 1 hour. No solid matter was separated through a series of operations, and a uniform particle dispersion was obtained. The solid content concentration of the particle dispersion was 33.2%, the particle size distribution was relatively broad, and the weight average particle size was 250 nm.

301.5 parts of this particle dispersion is poured into 700 parts by weight of hot water at 85 ° C. containing 5 parts of calcium chloride, the solid is separated, filtered and dried to obtain a mixed powder containing polytetrafluoroethylene ( B-2) 97 parts were obtained.

After B-2 was shaped into a strip at 250 ° C. by a press molding machine, ultrathin sections were observed with a microtome without staining using a transmission electron microscope. Although polytetrafluoroethylene is observed as a dark area, 10 μm
No aggregates larger than m were observed.

Reference Example 3 <Production of polytetrafluoroethylene-containing mixed powder (B-3)> A mixture of 70 parts of dodecyl methacrylate and 30 parts of methyl methacrylate was added to 2,2'-azobis (2,4-dimethylvaleronitrile). ) 0.1 parts were dissolved. 2.0 parts of sodium dodecylbenzenesulfonate and 3 parts of distilled water
Add 00 parts of the mixed solution, and mix
After stirring for 4 minutes at rpm, 30MP was added to the homogenizer.
2 times at the pressure of a, stable dodecyl methacrylate /
A methyl methacrylate preliminary dispersion was obtained. This was charged into a separable flask equipped with a stirring blade, a condenser, a thermocouple, and a nitrogen inlet, the internal temperature was raised to 80 ° C. under a nitrogen stream, and the mixture was stirred for 3 hours to undergo radical polymerization, and dodecyl methacrylate / methyl A methacrylate copolymer particle dispersion (hereinafter referred to as P-2) was obtained.

The solid concentration of P-2 was 25.1%, the particle size distribution showed a single peak, and the weight average particle size was 190.
nm, and the surface potential was -39 mV.

80 parts (20 parts of polytetrafluoroethylene) of F-1 used in Reference Example 1 and 239.0 parts of P-2
(60 parts of dodecyl methacrylate / methyl methacrylate copolymer) was charged into a separable flask equipped with a stirring blade, a condenser, a thermocouple, a nitrogen inlet, and a dropping funnel, and stirred at room temperature for 1 hour under a nitrogen stream. Then 8 in the system
The temperature was raised to 0 ° C., and a mixed solution of 0.001 part of iron (II) sulfate, 0.003 part of disodium ethylenediaminetetraacetate, 0.24 part of Rongalite salt and 10 parts of distilled water was added, and 20 parts of methyl methacrylate was added. Then, a mixture of 0.1 part of tertiary butyl peroxide was added dropwise over 30 minutes, and after completion of the addition, the internal temperature was maintained at 80 ° C. for 1 hour to complete the radical polymerization. No solid matter was separated through a series of operations, and a uniform particle dispersion was obtained. The solids concentration of the particle dispersion is 2
At 8.6%, the particle size distribution was relatively broad and the weight average particle size was 220 nm.

349.7 parts of this particle dispersion was poured into 600 parts of 75 ° C. hot water containing 5 parts of calcium chloride, and the solid was separated, filtered and dried to obtain a polytetrafluoroethylene-containing mixed powder (B -3) 98 parts were obtained.

After the dried B-3 was shaped into a strip shape at 220 ° C. by a press molding machine, the ultrathin section was cut with a microtome and observed with a transmission electron microscope without staining.
Polytetrafluoroethylene was observed as a dark part, but no aggregate larger than 10 μm was observed.

Reference Example 4 <Production of master pellet (M-1) of mixed powder containing polytetrafluoroethylene> Methyl methacrylate resin [Acrypet VH manufactured by Mitsubishi Rayon Co., Ltd., weight average molecular weight 105,000] 60 After mixing 40 parts of the tetrafluoroethylene-containing mixed powder B-3 obtained in Reference Example 3 with respect to parts and hand blending, a twin-screw extruder (ZSK manufactured by WERNER & PFLEIDERER) was used.
30), melt-kneading at a barrel temperature of 240 ° C. and a screw rotation speed of 200 rpm to form a pellet,
A master pellet (hereinafter referred to as M-1) of a polytetrafluoroethylene-containing mixed powder was obtained.

Examples 1-6, Comparative Examples 1-3 Methyl methacrylate resin (A-1, Mitsubishi Rayon Co., Ltd.)
Acrypet VH, weight average molecular weight 105,000) and the tetrafluoroethylene-containing mixed powder (B-1 to 3) or master pellet (M-1) obtained in each Reference Example in the ratio shown in Table 1. And twin screw extruder (WERNER & P
The pellets were extruded with a barrel temperature of 240 ° C. and a screw rotation speed of 200 rpm using a FSKLEDERER ZSK30). The melt tension and thermoformability were evaluated using the pellets. Table 1 shows the results.

For comparison, one extruded without adding a polytetrafluoroethylene-containing mixed powder (Comparative Example 1) and one extruded with polytetrafluoroethylene fine powder (CD123 manufactured by Asahi ICI) (Comparative Example 2) , 3) were similarly evaluated. Table 1 shows the results.

[0052]

[Table 1]

[0053]

EFFECT OF THE INVENTION The methyl methacrylate resin composition of the present invention is excellent in workability in thermoforming and the like because of its high surface tension and high melt tension in the molded article. That is, when this resin composition is injection-molded, the moldability of a large-sized molded product or a molded product having a large thickness at the end is excellent, and the meltdown during sheeting with an extruder is reduced, and the extrusion process is performed. Good characteristics. When the formed sheet or the like is thermoformed, a good product with less uneven thickness can be obtained. Further, the range of molding conditions for injection blow molding and direct blow molding is widened, and uneven wall thickness of the formed molded product is reduced. Furthermore, while satisfactory foams cannot be obtained with conventional methacrylic resins, foams having a high expansion ratio with little outgassing during foam molding can be obtained.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4J002 AC023 BB023 BB113 BB183 BC023 BC083 BC093 BC113 BC123 BD152 BE043 BF013 BF023 BG043 BG053 BG061 BG093 BG103 BH023 CD193 FB262 FD202 GK01

Claims (1)

[Claims] 1. A methyl methacrylate resin (A) 100
The polytetrafluoroethylene-containing mixed powder (B) composed of polytetrafluoroethylene particles having a particle diameter of 10 μm or less and an organic polymer is contained in an amount of 0.0001 to 20 parts by weight based on the weight of the mixed powder. A methyl methacrylate-based resin composition blended to be: