KR0166982B1 - Polyolefin resin composition - Google Patents

Abstract

The present invention relates to a thermoplastic resin composition, wherein the ethylene structural unit (80-98 mol%), the acrylate structural unit (1-15 mol%) and the acrylamide structural unit (2-20 mol%) are arranged in a linear shape It is obtained by blending a cationic copolymer having a weight average molecular weight of 1,000 to 50,000 to polyolefin resin, and is suitable for a molded article having a three-dimensional three-dimensional structure such as a material such as home appliance parts, in particular a casing or a container. It is used and characterized by excellent antistatic resistance, friction resistance, water resistance, transparency and impact strength.

Description

Thermoplastic Composition

The present invention is suitably used for molded materials having three-dimensional three-dimensional structure, such as materials, such as home appliance parts, casing, container, etc., and relates to a thermoplastic resin composition having excellent properties such as permanent antistatic property, water resistance, and friction resistance. will be.

Thermoplastic resins, for example, have been widely used in materials such as packaging materials, lighting equipment, home appliance parts, and instrument covers. However, molded articles made of thermoplastic resins, such as (meth) acrylic resins, generally have a large drawback in that they have a large electrical resistance, are easily charged by friction, and attract dust and the like.

In recent years, the following method has been proposed as a method of imparting antistatic ability to the thermoplastic resin. In other words,

① Drying after applying antistatic agent to resin surface

② How to put internally added antistatic agent in resin

③ How to apply silicone compound on the resin surface

④ How to reform the resin itself

And the like have been proposed.

In the method (1), a surfactant solution is used as an antistatic agent. However, such an antistatic agent is easily removed from the resin surface by washing and friction, and thus, it is not possible to impart a permanent antistatic ability.

In the method of (2) above, as an internal additive antistatic agent, for example, glycerin fatty acid ester, sorbitan fatty acid ester, alkyl diethanolamide, alkyl benzene sulfonate, quaternary salt of alkylimidazole, etc. are used. Even if the inhibitor is removed from the resin surface by washing, the antistatic ability lasts for a relatively long time because it newly bleeds on the resin surface in order.

However, if the antistatic ability is required for a long time to recover, and if the antistatic agent is excessively bleeded, the resin surface may become tacky and easily adhere to dust or the like. This caused a problem of deterioration of printing characteristics and appearance of the resin surface.

Moreover, since these antistatic agents have a small molecular weight, they are volatilized by the heat at the time of shaping | molding at high temperature. As a result, there have been problems such as economic disadvantages in which an antistatic agent must be added more than necessary and difficulty in adjusting an effective amount of the antistatic agent.

Polymethyl methacrylate (Japanese Patent Publication No. 89-170603) and alkoxypolyethylene glycol methacrylate in which 20 to 80 mol% of the latest methoxy group is diethanolamine-modified as a solution to the drawbacks of the above-described internal addition antistatic agent Graft copolymers (Japanese Patent Publication No. 83-39860), quaternized polymers after imide-modification of styrene maleic anhydride copolymer (Japanese Patent Publication No. 89-29820), polymethylmethacryl A comb copolymer of a high molecular weight monomer obtained by converting a terminal carboxyl group of a rate into a glycidyl methacrylate to a metalcryloyl group and an aminoalkyl acrylate ester or acrylamide and its quaternized cationic modified product (Japanese Patent Publication No. 87- A high molecular compound having an antistatic functional group such as No. 121717 has been proposed as an internal additive antistatic agent.

Similarly, ethylene-acryloylaminoalkyltrialkylammonium salt copolymer (molar ratio 65-99 / 1-35) or ethyleneacryloylaminoalkyltrialkylammonium salt-acrylic acid ester copolymer (molar ratio 65-99 / 1-35 / 0) 15) is disclosed in thermoplastic resins such as polyethylene, polypropylene, polyester and polyamide to obtain an antistatic film (Japanese Patent Laid-Open No. 93-5066).

However, there is no particular problem when the film having the composition described above is formed on a film or a sheet, but it has a three-dimensional three-dimensional structure such as a storage case. When applied to a molded article, it has a mechanical property such as water resistance, friction resistance, and impact strength. There was a problem in practical use. Moreover, there also existed a problem in which transparency of the said molded object falls.

In addition, Japanese Patent Application Laid-Open No. 93-78543 discloses a method for obtaining a permanent antistatic composition having transparency, and a method of adding an electrolyte to a polyethylene glycol derivative having a specific composition, but the durability and heat resistance of the resin composition obtained therefrom are shown. Not satisfactory and not practical.

Although the resin composition in which the antistatic ability lasts semipermanently can not be obtained by the method of the above ③, it is very disadvantageous in terms of price because the silicon compound used is expensive and the working efficiency is poor.

In addition, although the method of (4) is a method of introducing a hydrophilic group into the resin, it is necessary to introduce a considerable amount of hydrophilic group in order to give sufficient antistatic ability. However, when a large amount of hydrophilic groups were introduced into the resin, the resin itself lowered the hygroscopicity and the mechanical properties.

As mentioned above, the conventional thermoplastic resin composition which is said to have antistatic property is still inadequate antistatic capability, its durability, water resistance, mechanical property, etc., Especially in the conventional (meth) acrylic-type resin composition Besides the physical properties, there was a problem that the weather resistance and thermal stability is lacking.

The present invention has been carried out in view of the above-mentioned drawbacks of the prior art, and its object is to provide a molded article having a three-dimensional solid structure which has excellent permanent antistatic performance and excellent physical properties such as water resistance and mechanical properties. It is providing an acrylic resin composition and providing the composition which can obtain the molded object which has the outstanding weather resistance and thermal stability besides the said physical property.

The (meth) acrylic resin composition of the present invention,

(A) (meth) acrylic resin,

(B) Cationicity of the weight average molecular weight 1,000-50,000 which 80-98 mol% of ethylene structural units represented by Formula (I) and 2-20 mol% of acrylamide structural units represented by Formula (III) are arranged in linear form. Copolymer and

(C) consists of heat stabilizers and / or weathering agents.

(Wherein R ² is an ethylene group or a propylene group, R ³ and R ⁴ are methyl groups, R ⁵ is a linear alkyl group or an arylalkyl group having 1 to 8 carbon atoms, X ^- is a halide ion, CH ₃ OSO ₃ ^- or CH ₃ CH ₂ OSO ₃ ⁻ , and R ² may be the same or different for each structural unit.)

In addition, the (meth) acrylic resin composition of the present invention

(A) (meth) acrylic resin,

(B) 80-98 mol% of ethylene structural units represented by Formula (I), 15 mol% or less (0 mol% is not included) represented by Formula (II), and represented by Formula (III) A cationic copolymer having a weight average molecular weight of 1,000 to 50,000, wherein 2 to 20 mol% of acrylamide structural units are arranged in a linear phase;

(C) consists of heat stabilizers and / or weathering agents.

(Wherein^OneIs a methyl group or an ethyl group, R²Is an ethylene or propylene group, R³And R⁴Is methyl, R⁵Is a linear alkyl group or arylalkyl group having 1 to 8 carbon atoms, X^-Is a halide ion, CH₃OSO₃ ^-Or CH₃CH₂OSO₃ ^-And R^One, R²May be the same or different for each structural unit.)

Moreover, each structural unit (I)-(III) may be arrange | positioned regularly, and may be arranged irregularly.

[Metrics resin (A)]

Although the (meth) acrylic-type resin is used as the matrix resin (A) in the resin composition of this invention, the kind of each resin is not specifically limited.

As a specific example of (meth) acrylic-type resin, polymethyl methacrylate, ethyl polymethacrylate, propyl polymethacrylate, butyl polymethacrylate, methyl polyacrylate, ethyl polyacrylate, methyl methacrylate-methyl acrylate copolymer, Alkyl, such as methyl, ethyl, propyl, and butyl of (meth) acrylic acid, such as methyl methacrylate-ethyl methacrylate copolymer, methyl methacrylate-butyl methacrylate copolymer, and methyl methacrylate-ethyl acrylate copolymer Homopolymers or copolymers of ester compounds; and the like. These acrylic resins may be used alone or in combination of two.

Moreover, it does not specifically limit to the manufacturing method, A well-known suspension polymerization method, an emulsion polymerization method, a bulk polymerization method, etc. can be used.

Although it does not specifically limit as a weight average molecular weight of the said (meth) acrylic-type resin, 10,000-500,000 are preferable and 20,000-300,000 are more preferable.

Cationic Copolymer (B)

The structure of the cationic copolymer (B) used in the resin composition of this invention is demonstrated in detail below.

In the cationic copolymer (B) used in the present invention, the ethylene structural unit represented by the general formula (I) contains 80 to 98 mol% in the molecule. If the content ratio of the ethylene structural unit (I) is less than 80 mol%, the compatibility with the matrix resin (A) is deteriorated, and the water resistance and mechanical properties of the molded body are significantly reduced. In addition, when the content ratio exceeds 98 mol%, sufficient antistatic ability cannot be obtained. From the viewpoint of compatibility and antistatic ability, the preferable content range of the ethylene structural unit (I) is 85 to 97.5 mol%.

In addition, the acrylate structural unit represented by General formula (II) contains 0-15 mol% in a molecule | numerator. By containing this acrylate structural unit (II), the compatibility of a matrix resin (A) and a cationic copolymer (B) improves.

When the content rate of the acrylate structural unit (II) exceeds 15 mol%, mechanical properties deteriorate. From the viewpoint of compatibility, the preferable range of the content ratio of the acrylate structural unit (II) is 0.0001 to 13 mol%, more preferably 1 to 13 mol%, and still more preferably about 3 to 13 mol%.

In general formula (II), R <^1> may represent a methyl group or an ethyl group, and R <^1> may be same or different for every structural unit (that is, a methyl group and an ethyl group may be mixed in 1 molecule).

In addition, the acrylamide structural unit represented by general formula (III) is a cationic structural unit in the form of quaternary ammonium salt, and is contained 2-20 mol% in a molecule | numerator.

If the content ratio is less than 2 mol%, the antistatic ability of the resin composition is poor, and if the content ratio is more than 20 mol%, the cationic copolymer (B) is compatible with the matrix resin (A). This worsens. From the viewpoint of antistatic ability and compatibility, the preferable range of the content ratio of acrylamide structural unit (III) is 2.5 to 15 mol%.

In General Formula (III), R ² represents an ethylene group or a propylene group, these may be mixed in one molecule, R ³ and R ⁴ represent a methyl group, and R ⁵ may provide ease of manufacture and good antistatic ability. methyl group at that point of view, represents an arylalkyl group, such as payment alkyl group of straight-chain (carbon number 1-8) or benzyl group in the group and the like, X ^- is Cl ^-, Br ^-, I ^- a halide ion such as, CH ₃ OSO ₃ ^- indicates ^- or CH ₃ CH ₂ OSO _3.

The weight average molecular weight of the cationic copolymer (B) is the weight average molecular weight of polystyrene in terms of gel permeation chromatography, and the measurement is carried out by ultra-high temperature GPC method (Cheoncheon), `` Polymer Papers Vol. 139, pp. 139-141, 1987). The range of the weight average molecular weight of a cationic copolymer (B) is 1,000-50,000. If the weight average molecular weight is less than 1,000, the cationic copolymer (B) becomes waxy, the handling property is deteriorated, and the tackiness of the resin surface is increased by bleeding out, and the weight average molecular weight is 50,000. If it exceeds the problem occurs that the compatibility with respect to the matrix resin (A) is deteriorated. The preferable range of the weight average molecular weight of the said copolymer (B) is 3,000-30,000.

As a manufacturing method of the cationic copolymer (B) used in the resin composition of this invention, the ethylene-acrylic acid ester copolymer obtained by copolymerizing ethylene and an acrylate ester by a high pressure polymerization method, for example is Unexamined-Japanese-Patent No. 85 By hydrolysis at the same time as the method described in -79008, to a desired molecular weight, and further obtained by amidating the obtained ethylene-acrylic acid ester-acrylic acid copolymer with N, N-dialkylaminoalkylamine Although the method of obtaining the said cationic copolymer (B) by modifying and separating a cation with a quaternization agent is mentioned, it is not limited to this.

Although the amount of the cationic copolymer (B) added to the matrix resin (A) in the resin composition of the present invention is practically 3 to 30% by weight, when the amount is less than 3% by weight, the required antistatic properties are required. In contrast, when the addition amount exceeds 30% by weight, the mechanical properties of the resin, in particular, the impact strength are lowered.

The amount of the cationic copolymer (B) added to the matrix resin (A) is preferably 5 to 30% by weight, based on the balance between the antistatic properties and the mechanical properties in the resin composition.

As a method for producing the resin composition of the present invention, the cationic copolymer (B) may be added to the matrix resin (A) by a known method such as a twin screw extruder.

[Heat Stabilizer, Weathering Agent (C)]

Examples of thermal stabilizers include tetrax (2,4-di-t-butylphenyl) 4,4'-biphenylenediphosphonate, distearylpentaerythritol diphosphite, and tris (2,4-di-t-butylphenyl ) Phosphite, phosphorus stabilizer such as 3,4,5,6-dibenzo-1,2-oxaphosphane-2-oxide, tetrakis [methylene-3 (3,5di-t-butyl-4- Phenolic stabilizers such as hydroxyphenyl) propionate] methane, 2,6-di-t-butyl-4-methyl-phenol, 2-t-butyl-4-methoxyphenol, sulfur such as mercaptopropionic acid ester Although containing stabilizers can be used, phosphorus containing stabilizers are preferable.

As weathering agents such as ultraviolet absorbers and light stabilizers, for example, 2- (2'-hydroxy-3 ', 5'-di-t-butylphenyl) -5-chlorobenzotriazole, 2- (2'-hydrate Roxy-3 ', 5'-di-t-amylphenyl) -5-benzotriazole, 2,2'-methylenebis [4- (1,1,3,3-tetramethylbutyl) -6- (2 -N-benzotriazol-2-yl) phenol], 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-3 ', 5'-dicumylphenyl Triazole-based ultraviolet absorbers and bis (2,2,6,6-tetramethyl-4-piperadi) such as phenylbenzotriazole and 2- (2'-hydroxy-5'-t-octylphenyl) benzotriazole Nil) sebacate, poly [[6- (1,1,3,3-tetramethylbutylimino) -1,3,5-triazine-2,4-diyl]-[4- (2,2, Hindered amine light stabilizers such as 6,6-tetramethylpiperidinyl) -imino]-[4- (2,2,6,6-tetramethylpiperidyl) imino]]. Among them, triazole-based ones are effective, and among them, particularly excellent weatherability and transparency are given by 2,2'-methylenebis [4- (1,1,3,3-tetramethylbutyl) -6- (2N-benzotriazole -2-yl) phenol].

The heat stabilizer and the weathering agent are preferably added in an amount of 0.01 to 2.0 parts by weight based on 100 parts by weight of the matrix resin (A).

Other nonionic or cationic surfactants and polymers having polyoxyethylene chains, for example, high molecular weight or urethane bonds and epoxy esters obtained by polycondensation of polyoxyethylene and polyethylene glycol with ester bonds, amide bonds and imide bonds. The antistatic agent of the high molecular weight added by the bond and the epoxy ether bond may be added simultaneously within the range not exceeding the addition amount of the cationic copolymer (B) of the present invention.

Furthermore, bromine-containing flame retardants and phosphorus compound-containing flame retardants such as inorganic fillers such as calcium carbonate, talc, glass fibers, hexabromocyclododecane, tetrabromobisphenol (A) and derivatives thereof, and bromide of diphenyl ether And flame retardant aids such as Sb ₂ O ₃ may be added at the same time.

The cationic copolymer (B) added in the resin composition of the present invention forms a continuous layer in the matrix resin (A) and is transferred by charge transfer accompanying the movement of ions to the cation group in the copolymer (B) molecule. Static leakage occurs. As a result, the cationic copolymer (B) has a higher rate of static electricity leakage than the conventional internally-added antistatic agent that leaks the generated static electricity by a moisture absorbing layer formed by bleeding out of the resin surface. .

Further, in the resin composition of the present invention, since the cationic copolymer (B) does not exist at a high concentration near the surface of the resin which is easily influenced by the external agent, it achieves a number of significant effects as described below.

(1) The resin composition of the present invention is a resin composition having excellent permanent antistatic property without causing loss of antistatic effect due to friction, washing with water or the like on the surface. In addition, in the case of using an ordinary antistatic agent, the resin composition of the present invention maintains an antistatic ability at a high level even under severe conditions (such as molding processing at high temperature) where the effect is lost.

(2) In the resin composition of the present invention, there is no problem that adhesiveness occurs on the surface of the resin due to excessive bleed-out as in the case of using a conventional internal additive antistatic agent, and consequently, dust or the like becomes easily attached.

(3) By blending the heat stabilizer and the weathering agent, a resin composition capable of obtaining a molded article having excellent heat stability and weather resistance in addition to excellent antistatic properties can be obtained.

(4) The cationic copolymer (B) is blended and molded into the matrix resin (A) made of (meth) acrylic resin to impart permanent antistatic property to the (meth) acrylic resin molded body and at the same time, the molded body. Can improve the friction resistance. That is, the cationic copolymer (B) acts as a friction resistance improver having antistatic property imparting ability to the matrix resin (A). This action is remarkable when the blending ratio of the cationic copolymer to the matrix resin is 3 to 30% by weight.

(5) Furthermore, by blending and molding the cationic copolymer (B) with the matrix resin (A), it is possible to impart permanent antistatic properties to the (meth) acrylic resin molded body and to improve the impact strength of the molded body. Can be. That is, the cationic copolymer (B) acts as an impact strength enhancer having antistatic property imparting ability to the matrix resin (A). This action is remarkable when the blending ratio of the cationic copolymer to the matrix resin is 3 to 30% by weight.

(6) Furthermore, by blending and molding the cationic copolymer (B) in the matrix resin (A), it is possible to impart permanent antistatic properties to the (meth) acrylic resin molded body and to improve the water resistance of the molded body. have. That is, the cationic copolymer (B) acts as a water resistance improver having antistatic property imparting ability to the matrix resin (A). This action is remarkable when the blending ratio of the cationic copolymer to the matrix resin is 3 to 30% by weight.

(7) Even when the resin composition of the present invention is molded into a molded article having a three-dimensional three-dimensional structure such as an article storage case or a container, the molded article has excellent impact resistance, friction resistance, elongation, water resistance, and the like.

(8) Moreover, in the molded object which consists of resin compositions, transparency of the used matrix resin itself can also be fully maintained. In other words, the molded article having the permanent antistatic property and excellent transparency can be obtained by the resin composition of the present invention.

About the said transparency, since the refractive index of a cationic copolymer (B) shows about 1.47-1.52, and is very close to that of (meth) acrylate type resin, the molded object which consists of obtained resin composition is equipped with the outstanding transparency. For reference, the refractive indices of methyl methacrylate, ethyl methacrylate, i-propyl methacrylate and tert-butyl methacrylate are 1.489, 1.485, 1.4728 and 1.4638, respectively.

EXAMPLE

First, the specific synthesis example of the cationic copolymer (B) used in this invention is demonstrated.

[Synthesis example (B-1) of a cationic copolymer (B)]

400 ml of xylene, 150 g of ethylene-ethyl acrylate-acrylic acid copolymer (ethylene / ethyl acrylate / acrylic acid = 93/3/4) and paratoluene in a four-liter flask equipped with thermometer, stirrer, dropping lot and Dean-Stark fountain 1.0 g of sulfonic acid was added.

Next, 21.1 g of N, N-dimethylaminopropylamine was added thereto, heated at 140 ⁰ C using an oil bath, and the reaction was continued for 17 hours while continuously removing the produced water by azeotroping with xylene. The amidation reaction was continued until the azeotrope of the said water was not confirmed.

458 g of the reaction product thus obtained was cooled to 80 ⁰ C, and 31.1 g of diethyl sulfate was slowly added dropwise thereto over 1 hour. The exotherm was confirmed during this time, but as it cooled, the reaction temperature was maintained at 90 ⁰ C, and after completion of the dropwise addition, heat aging was performed at 100 ⁰ C for 4 hours.

The reaction product obtained here was thrown into a large amount of methanol, the produced | generated deposit was collect | recovered and dried, and the cationic copolymer (B-1) was obtained. The weight average molecular weight of the copolymer (B-1) was measured and found to be 5,300.

[Synthesis example of cationic copolymer (B) (B-2)]

In a four-liter flask equipped with a thermometer, a stirrer, a dropping lot, and a Dean-Stark fountain, 400 ml of xylene, 150 g of ethylene-acrylic acid copolymer (ethylene / acrylic acid = 91/9) and 1.0 g of paratoluene sulfonic acid were added.

Next, 38.5 g of N, N-dimethylaminopropylamine was added thereto, heated at 140 ⁰ C using an oil bath, and the reaction was continued for 17 hours while continuously removing the produced water by azeotroping with xylene. The amidation reaction was continued until the azeotrope of the said water was not confirmed.

The obtained reaction was cooled to 80 ⁰ C, and 72.0 g of methyl iodide was added dropwise thereto over 1 hour. The exotherm was confirmed during this time, but as it cooled, the reaction temperature was maintained at 90 ⁰ C, and after completion of the dropwise addition, the aging reaction was performed at 100 ⁰ C for 4 hours.

The reaction product obtained here was thrown into a large amount of n-hexane, and the produced | generated deposit was collect | recovered and dried, and the cationic copolymer (B-2) was obtained. It was 22,000 when the weight average molecular weight of the said copolymer (B-2) was measured.

[Synthesis example (B-3) of a cationic copolymer (B)]

400 ml of xylene, 150 g of ethylene-acylanethyl-acrylic acid copolymer (ethylene / ethyl acrylate / acrylic acid = 93/3/4) in a four-liter flask equipped with a thermometer, agitator, dropping lot and Dean-Stark fountain 1.0 g of paratoluenesulfonic acid was added thereto.

Next, 21.1 g of N, N-dimethylaminopropylamine was added and heated at 140 ° C. using an oil bath. The reaction was continued for 17 hours while continuously removing the produced water by azeotroping with xylene. The amidation reaction was continued until it was not confirmed.

458 g of the obtained reaction product was cooled to 80 ° C, and 25.5 g of benzyl chloride was slowly added dropwise thereto over 1 hour in a dropping lot. Although exotherm was confirmed during this time, the reaction temperature was maintained at 90 ° C. as it cooled, and the aging reaction was carried out at 100 ° C. for 4 hours after the end of dropping.

The reactant obtained here was thrown into a large amount of methanol, the produced precipitate was collected and dried to obtain a cationic copolymer (B-3). It was 5,500 when the weight average molecular weight of this copolymer (B-3) was measured.

Comparative Example (B-4)

150 g of xylene, ethylene-ethyl acrylate-acrylic acid copolymer (ethylene / ethyl acrylate / acrylic acid = 65/5/30) in a four-liter flask equipped with a thermometer, agitator, dropping lot and Dean-Stark fountain And 1.0 g of paratoluene sulfonic acid was added thereto.

Next, 105.6 g of N, N-dimethylaminoethylamine was added thereto, heated at 140 ° C. using an oil bath, the reaction was continued for 17 hours while the resulting water was continuously removed by azeotroping with xylene, and azeotropy of the resulting water was achieved. The amidation reaction was continued until it was not confirmed.

The obtained reaction product was cooled to 80 degreeC, and 170.4 g of methyl iodide was dripped there over 1 hour. Although exotherm was confirmed during this time, the reaction temperature was maintained at 90 ° C. as it cooled, and the aging reaction was carried out at 100 ° C. for 4 hours after the end of dropping.

The reaction product obtained here was thrown into a large amount of n-hexane, and the produced | generated deposit was collect | recovered and dried, and the cationic copolymer (B-4) was obtained. It was 8,600 when the weight average molecular weight of this copolymer (B-4) was measured.

[Examples 1-6 and Comparative Example 1]

Polymethyl methacrylate (weight average molecular weight 150,000) used as the matrix resin (A), the cationic copolymers (B-1) to (B-3) obtained in the above synthesis example, and the heat stabilizer shown in Table 1 below. The latter was kneaded and kneaded in a compounding ratio shown in Table 1 by a twin-screw extruder (former Kurimoto Co., Ltd., KRC Kneader-S-II) equipped with a fixed-quantity feeding device, and then cold-cut to prepare a composition pellet. It was molded and used as the test body.

The molded article (test body) was subjected to (1) antistatic performance test and (2) weather resistance test, and the results are shown in Table 2. In addition, the same test was done also about the molded object (corresponding to Comparative Example 1) which did not mix | blend a heat stabilizer and a weatherproofing agent, and the result was put together in Table 2 for comparison.

① Antistatic

Antistatic property was evaluated by surface specific resistance value.

The surface intrinsic resistance value measured the resistance value when the voltage of 500V was applied to the said molded object (test body, 60X60X3mm) with the megaohmmeter (made by Doa Denpasar).

② Weatherability

A 2 mm-thick flat plate obtained by injection molding was subjected to a 500-hour accelerated exposure test using a Weserometer (manufactured by Sugashi-Kinki Co., Ltd.). Measured before and after the test. Moreover, the total light transmittance (%) before and after a test was measured by JIS-K7105.

The heat stabilizer and the weathering agent used here are shown below.

[Heat stabilizer]

Sandstab P-EPQ (Sandoz): Tetrakis (2,4-di-t-butylphenyl) -4,4'-biphenylenediphosphonite

Adecastub PEP-8 (Asahi Denka Co., Ltd.): distearyl-pentaerythritol diphosphite

Adecastab 2112 (Asahi Denka Co.): Tris- (2,4-di-t-butylphenyl) phosphite

[Weather resistant]

Adecastub LA-31 (Asahi Denka Co., Ltd.): 2,2'-methylenebis [4 '-(1, 1, 3, 3-tetramethylbutyl) -6- (2-N-benzotriazole-2- Phenol)

Tinuvin 327 (Shiba-Geigi Co., Ltd.): 2- (2'-hydroxy-3 ', 5'-di-t-butylphenyl) -5-chlorobenzotriazole

Tinuvin 328 (Shiba-Geigi Co., Ltd.): 2- (2'-hydroxy-3 ', 5'-di-t-amylphenyl) benzotriazole

Tinuvin P (Shiba-Geigi Co., Ltd.): 2- (2'-hydroxy-3 ', 5'-methylphenyl) benzotriazole

Tinuvin 234 (Shiba-Geigi Corp.): 2- (2'-hydroxy-3 ', 5'-bis ( , -Dimethylbenzyl) phenylbenzotriazole

From Table 2, it can be seen that when the heat stabilizer and the weathering agent are used in combination with the cationic copolymer, not only the antistatic property but also excellent heat stability and weather resistance are obtained.

Claims (4)

(A) (meth) acrylic resin, (B) 80-98 mol% of ethylene structural units represented by following formula (I), and 2-20 mol% of acrylamide structural units represented by following formula (III) are arranged in linear form. A (meth) acrylic resin composition comprising a cationic copolymer having a weight average molecular weight of 1,000 to 50,000, and (C) a heat stabilizer and / or a weathering agent. (Wherein, R ² is an ethylene group or a propylene group, R ³ and R ⁴ is a methyl group, R ⁵ is an alkyl group or an aryl group of a straight-chain shape with a carbon number of 1 ~ 8, X ^- is a halide ion, CH ₃ OSO ₃ ^- Or CH ₃ CH ₂ OSO ₃ ⁻ , and R ² may be the same or different for each structural unit.) (A) 80-98 mol% of (meth) acrylic-type resin and (B) ethylene structural unit represented by following formula (I), 15 mol% or less of acrylate structural unit represented by following formula (II), and following formula (III) (Meth) acrylic resins, characterized in that the cationic copolymer having a weight average molecular weight of 1,000 to 50,000 consisting of 2 to 20 mol% of acrylamide structural units represented by Composition. (Wherein R ¹ is a methyl group or an ethyl group, R ² is an ethylene group or a propylene group, R ³ and R ⁴ are a methyl group, R ⁵ is a linear alkyl group or an arylalkyl group having 1 to 8 carbon atoms, and X ⁻ is a halide ion , CH ₃ OSO ₃ ^- or CH ₃ CH ₂ OSO ₃ ^- represents a, R ^1, R ² may be the same or different, each structural unit). The (meth) acrylic resin molding according to claim 1, wherein the (meth) acrylic resin molding is molded into a molded body having a three-dimensional three-dimensional structure. The (meth) acrylic resin molding according to claim 2, wherein the (meth) acrylic resin composition is molded into a molded body having a three-dimensional three-dimensional structure.