KR20160035579A - Transparent thermoplastic resin composition and molded article using the same - Google Patents

Abstract

The present invention relates to a transparent thermoplastic resin composition having excellent coloring properties, weather resistance, and scratch resistance, and a molded product using the same. The transparent thermoplastic resin composition comprises: (A) 5 to 40 wt% of an impact reinforcing material having a core-shell structure which forms a shell by making an acrylic compound grafted in a rubber core in which an acrylic monomer and a diene-based monomer are copolymerized; and (B) 60 to 95 wt% of an acrylic resin having a refractive index of 1.480 to 1.495. Refractive index difference of (A) the impact reinforcing material and (B) the acrylic resin is 0.001 to 0.2.

Description

TECHNICAL FIELD [0001] The present invention relates to a transparent thermoplastic resin composition and a molded article using the transparent thermoplastic resin composition.

To a transparent thermoplastic resin composition and a molded article using the transparent thermoplastic resin composition.

The thermoplastic resin has a lower specific gravity than glass or metal, and has excellent physical properties such as excellent moldability and impact resistance. In recent years, plastic products using thermoplastic resins have been rapidly replacing existing glass and metal parts in accordance with the trend of low cost, large size, and light weight of electric and electronic products, thereby widening the use range from electric / electronic products to automobile parts.

In the case of automobile materials, the demand for unpainted materials is increasing due to the recent weight reduction for energy saving and the increase of environment-friendly concept. When applying non-painted materials as automobile exterior materials, it has advantages of eco-friendly process and cost reduction by eliminating existing painting process, but it is necessary to manifest high coloring property of material itself. In addition to this, it is required to be resistant to external temperature and moisture, Scratch resistance is required.

ASA (acrylate-styrene-acrylonitrile copolymer) resin which improves the weatherability which is a disadvantage of existing ABS (acrylonitrile-butadiene-styrene copolymer) resin is mainly used as an exterior material of automobile. The ASA resin has the advantage of excellent weather resistance using an acrylic impact modifier (g-ASA) having no double bond, which is excellent in the properties of ABS while maintaining excellent physical properties of ABS. However, it has poor colorability due to low refractive index acrylic impact modifier, It is difficult to apply it as a high-gloss unpainted material.

The acrylic resin typified by PMMA (polymethylmethacrylate) resin is excellent in transparency and weatherability, and has excellent mechanical strength, surface gloss and adhesive force. Especially, scratch resistance is excellent, but impact resistance is very weak. There are many restrictions to apply.

As a method for enhancing the impact resistance of an acrylic resin excellent in coloring property, weather resistance and scratch resistance, a method of applying a transparent acrylic impact modifier having a similar refractive index is generally used. (Korean Patent Application No. 1999-7011551, No. 2003-0053711). However, when the impact resistance is increased through such transparent acrylic impact modifier, impact resistance improvement effect is lowered by the impact resistance of acrylic impact modifier than that of butadiene impact modifier In order to match the refractive index with the acrylic resin, acrylic monomer and styrene monomer are applied to the core, and in the case of the transparent acrylic impact modifier, acrylic monomer is applied to the shell, the acrylic impact modifier for the similar ASA resin (g-ASA) The effect is relatively low. Also, when the content is increased, the heat resistance, mechanical properties, and scratch resistance are deteriorated, which leads to limitations in improving the impact strength. Alternatively, a small amount of a butadiene impact modifier may be applied together with the impact modifier to compensate for the decrease in the impact strength, but in this case, there is a problem that the weather resistance is lowered.

A transparent thermoplastic resin composition excellent in coloring property, scratch resistance and weather resistance, and high in impact strength, and a molded article using the transparent thermoplastic resin composition.

(A) 5 to 40% by weight of an impact modifier having a core-shell structure in which an acryl compound is grafted on a rubber core copolymerized with an acrylic monomer and a diene monomer, and (B) a refractive index And a refractive index difference between the impact modifier (A) and the acrylic resin (B) is 0.001 to 0.2. The transparent thermoplastic resin composition according to claim 1,

In the rubber core of the impact modifier (A), the content ratio of the acrylic monomer and the diene monomer may be 99: 1 to 50:50 by weight.

The content of the rubber core may be 30 wt% to 80 wt% with respect to 100 wt% of the impact modifier (A), and the content of the shell may be 20 wt% to 70 wt%.

The particle size of the impact modifier (A) may be 50 nm to 500 nm.

The glass transition temperature of the impact modifier (A) may be from -70 ° C to -55 ° C.

The average refractive index of the impact modifier (A) may be 1.474 to 1.496.

The weight average molecular weight of the acrylic resin (B) may be 50,000 g / mol to 200,000 g / mol.

The transparent thermoplastic resin composition may further comprise (C) an impact modifier having a core-shell structure in which a shell is formed by grafting an acrylic compound onto a rubber core copolymerized with a C4 to C30 acrylic monomer and an aromatic vinyl monomer.

Another embodiment of the present invention provides a molded article using the transparent thermoplastic resin composition.

The value measured on the basis of the thickness of 1.5 mm to 2.5 mm, and the haze of the molded article may be 0.5% to 10% and the transmittance may be 85% to 95%.

The molded article may include a black colorant, wherein the L value of the CIE color indicator of the molded article may be less than 28 based on black.

The pencil hardness (JIS K 5401) of the molded article may be at least HB.

The value of? E measured after 3,000 hours in the SAE J 1960 condition of the molded article may be 3 or less.

The 1/8 "Izod impact strength (ASTM D256) of the molded article may be 3 kgf · cm / cm to 12 kgf · cm / cm.

The transparent thermoplastic resin composition and the molded article using the transparent thermoplastic resin composition according to one embodiment of the present invention are excellent in coloring property, scratch resistance, weather resistance, and impact strength.

Hereinafter, embodiments of the present invention will be described in detail. However, it should be understood that the present invention is not limited thereto, and the present invention is only defined by the appended claims.

As used herein, unless otherwise defined, at least one hydrogen in the compound is a C1 to C30 alkyl group; C1 to C10 alkylsilyl groups; A C3 to C30 cycloalkyl group; A C6 to C30 aryl group; A C2 to C30 heteroaryl group; A C1 to C10 alkoxy group; A C1 to C10 trifluoroalkyl group such as a fluoro group and a trifluoromethyl group; Or cyano group.

As used herein, unless otherwise defined, it is meant that one compound or substituent contains 1 to 3 heteroatoms selected from the group consisting of N, O, S, and P, with the remainder being carbon do.

As used herein, unless otherwise defined, the term " alkyl group "means a" saturated alkyl group "which does not include any alkenes or alkynes; Or "unsaturated alkyl group" comprising at least one alkenyl group or alkynyl group. Means a substituent wherein at least two carbon atoms constitute at least one carbon-carbon double bond, and "alkynyl group" means a substituent wherein at least two carbon atoms constitute at least one carbon-carbon triple bond it means. The alkyl group may be branched, straight-chain or cyclic.

The alkyl group may be a C1 to C20 alkyl group, and specifically may be a C1 to C6 lower alkyl group, a C7 to C10 intermediate alkyl group, or a C11 to C20 higher alkyl group.

"Aromatic" means a compound in which all elements of the cyclic substituent have p-orbital, and these p-orbital forms a conjugation. Specific examples thereof include an aryl group and a heteroaryl group.

An "aryl group" includes a single ring or a fused ring (i.e., a plurality of rings that divide adjacent pairs of carbon atoms) substituents.

"Heteroaryl group" means that the aryl group contains 1 to 3 heteroatoms selected from the group consisting of N, O, S and P, and the remainder is carbon. When the heteroaryl group is a fused ring, it may contain 1 to 3 heteroatoms in each ring.

Unless otherwise specified herein, (meth) acrylate means acrylate or methacrylate. The (meth) acrylic acid alkyl ester means an acrylic acid alkyl ester or a methacrylic acid alkyl ester, and the (meth) acrylic acid ester means an acrylic acid ester or a methacrylic acid ester.

Unless otherwise defined herein, "copolymerization" may mean block copolymerization, random copolymerization, graft copolymerization or alternating copolymerization, and the term "copolymer" means a block copolymer, random copolymer, graft copolymer or alternating copolymer It can mean merging.

(A) 5 to 40% by weight of an impact modifier having a core-shell structure in which an acryl compound is grafted on a rubber core copolymerized with an acrylic monomer and a diene monomer, and (B) a refractive index And 60 to 95% by weight of an acrylic resin having a refractive index of 1.480 to 1.495.

Hereinafter, each component contained in the thermoplastic resin composition will be described in detail.

(A) Shock Reinforcing agent

The impact modifier is a core-shell structure compound in which an acrylic compound is grafted on a rubber core in which an acrylic monomer and a diene monomer are copolymerized to form a shell. The shell may be a single layer or may be a multilayer of two or more layers.

The transparent thermoplastic resin composition containing the impact modifier may exhibit excellent coloring property, weather resistance, scratch resistance, and high impact strength.

In the rubber core, the acrylic monomer may be a C4 to C30 acrylic monomer. Specifically, the acrylic monomer is at least one selected from the group consisting of methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, n-butyl (meth) acrylate, (Meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, or combinations thereof.

As the curing agent, at least one of ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, 1,3-butylene glycol di (meth) acrylate, 1,4- (Meth) acrylate, triallyl cyanurate and the like can be further used.

In the rubber core, the diene-based monomer may be a C4 to C6 diene such as butadiene, isoprene, or a combination thereof, and specifically may be butadiene.

In the shell, the acrylic compound may be (meth) acrylate, alkyl (meth) acrylate, or a combination thereof. Specifically, the acrylic compound may be at least one selected from the group consisting of methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, n-butyl (meth) acrylate, (Meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, or a combination thereof.

In the impact modifier, the content of the rubber core may be 30% by weight to 80% by weight, for example, 50% by weight to 75% by weight. In the impact modifier, the content of the shell may be 20 wt% to 70 wt%, for example, 25 wt% to 50 wt%. When the above range is satisfied, the transparent thermoplastic resin composition containing the impact modifier exhibits excellent coloring property, weather resistance, scratch resistance, and high impact strength.

The average particle diameter of the impact modifier may be 50 nm to 500 nm, for example, 100 nm to 300 nm. When the above range is satisfied, the transparent thermoplastic resin composition containing the impact modifier exhibits excellent coloring property, weather resistance, scratch resistance, and high impact strength.

The glass transition temperature (Tg) of the impact modifier may be from -70 캜 to -55 캜, for example, from -70 캜 to -60 캜. When the above range is satisfied, the transparent thermoplastic resin composition containing the impact modifier exhibits excellent coloring property, weather resistance, scratch resistance, and high impact strength.

The refractive index of the impact modifier may be 1.474 to 1.496. The refractive index was measured using spectroscopic ellipsometers, a refractive index meter of J. A. Woollam. The impact modifier may include 5 wt% to 40 wt%, for example, 15 wt% to 30 wt%, based on 100 wt% of the transparent thermoplastic resin composition. When the above range is satisfied, the transparent thermoplastic resin composition exhibits excellent coloring property, weather resistance, scratch resistance, and high impact strength.

(B) Acrylic resin

The transparent thermoplastic resin composition includes an acrylic resin. The acrylic resin may be any acrylic resin generally used in the technical field of the present invention.

The acrylic resin may specifically be (meth) acrylate, alkyl (meth) acrylate, or a combination thereof. The (meth) acrylate is methacrylate or acrylate, and the alkyl (meth) acrylate is alkyl methacrylate or alkyl acrylate. The alkyl may be C1 to C10 alkyl.

Specific examples of the alkyl (meth) acrylate include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, glycidyl (meth) Ethyl (meth) acrylate, and the like.

The acrylic resin may be obtained by polymerizing a starting monomer containing (meth) acrylate and / or alkyl (meth) acrylate by a known polymerization method such as suspension polymerization, bulk polymerization or emulsion polymerization.

The acrylic resin may be, for example, a copolymer of alkyl methacrylate and alkyl acrylate. In this case, the acrylic resin may include 80 to 99% by weight of the alkyl methacrylate and 1 to 20% by weight of the alkyl acrylate.

The refractive index of the acrylic resin may be 1.480 to 1.495, for example, 1.485 to 1.490. The difference in refractive index between the acrylic resin and the impact modifier (A) may be 0.001 to 0.2, such as 0.006 to 0.01. When the above range is satisfied, the transparency thermoplastic resin composition has high transparency and thus is excellent in coloring property. On the other hand, the refractive index is a value measured by spectroscopic ellipsometers, which is a refractive index measuring instrument of J. A. Woollam.

The weight average molecular weight of the acrylic resin may be 50,000 g / mol to 200,000 g / mol, for example, 70,000 g / mol to 150,000 g / mol. The weight average molecular weight is a polystyrene reduced molecular weight measured by gel permeation chromatography. When the above range is satisfied, the transparent thermoplastic resin composition can exhibit excellent coloring property, scratch resistance and weather resistance.

(C) Other impact reinforcement additives

The transparent thermoplastic resin composition may further include other impact reinforcing additives other than the impact modifier described above.

The other impact reinforcing additive may have a structure in which an unsaturated compound is grafted on a rubber core to form a shell.

Wherein the rubber core comprises a rubbery polymer obtained by polymerizing a diene monomer; Or a rubber polymer obtained by polymerizing a diene monomer and a monomer selected from the group consisting of an acrylic monomer, a silicone monomer, an aromatic vinyl monomer, and a combination thereof, and the content of the rubber core is not more than 20% to 80% by weight.

The unsaturated compound grafted onto the core of the rubber may be selected from the group consisting of an acrylic monomer, an aromatic vinyl monomer, an unsaturated nitrile monomer, a reactive monomer, a polymer formed from at least one of these monomers, and a combination thereof.

In one embodiment, the transparent thermoplastic resin composition may further include an impact modifier having a core-shell structure in which a shell is formed by grafting an acrylic compound onto a rubber core in which C4 to C30 acrylic monomers and aromatic vinyl monomers are copolymerized.

In the rubber core, the C4 to C30 acrylic monomer may specifically be n-butyl (meth) acrylate, hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate or a combination thereof.

In the rubber core, the aromatic vinyl monomer may be styrene, C1 to C10 alkyl substituted styrene, halogen substituted styrene or a combination thereof. Specific examples of the alkyl-substituted styrene include o-ethylstyrene, m-ethylstyrene, p-ethylstyrene, and -methylstyrene.

In the shell, the acrylic compound may be (meth) acrylate, alkyl (meth) acrylate, or a combination thereof. Specifically, the acrylic compound may be at least one selected from the group consisting of methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, n-butyl (meth) acrylate, (Meth) acrylate, or a combination thereof.

When the transparent thermoplastic resin composition further comprises other impact reinforcing additive, the transparent thermoplastic resin composition contains 2.5 to 35% by weight of the impact modifier (A), 60 to 95% by weight of the acrylic resin (B) , And 2.5 to 35% by weight of the other impact reinforcing additive (C). In this case, the transparent thermoplastic resin composition exhibits excellent coloring property, scratch resistance and weather resistance, and can secure excellent impact resistance.

(D) Other additives

The transparent thermoplastic resin composition may further comprise one or more other additives in order to balance physical properties or according to the needs of the end use. Specific examples of the additives include flame retardants, surfactants, nucleating agents, coupling agents, fillers, plasticizers, impact modifiers, lubricants, antibacterial agents, mold release agents, antioxidants, inorganic additives, colorants, lubricants, antistatic agents, pigments, Heat stabilizers, ultraviolet absorbers, ultraviolet screening agents, nucleating agents, adhesives, etc. may be used alone or in combination of two or more.

In particular, the transparent thermoplastic resin composition may further contain a coloring agent depending on the purpose and purpose.

The other additives may be appropriately contained within a range that does not impair the physical properties of the transparent thermoplastic resin composition and specifically may be included in an amount of 40 parts by weight or less based on 100 parts by weight of the transparent thermoplastic resin composition, By weight to 30 parts by weight.

The above-mentioned transparent thermoplastic resin composition can be produced by a known production method. For example, the components and other additives according to one embodiment may be simultaneously mixed and then melt-extruded in an extruder and produced in the form of pellets.

Another embodiment of the present invention provides a molded article using the transparent thermoplastic resin composition.

The molded article can be produced by various processes such as injection molding, blow molding, extrusion molding, and thermoforming using a thermoplastic resin composition.

The molded article is excellent in mechanical properties such as impact resistance and heat resistance, and can secure improved weathering resistance, and can be advantageously used for various electric and electronic parts, building materials, sporting goods, and automobile parts used outdoors.

The molded article has excellent transparency. The transparency of the molded article can be evaluated by haze and transmittance (TT). The lower the haze and the higher the transmittance, the better the transparency.

The haze means turbidity or cloudiness, which can be calculated by the following equation (1).

[Equation 1]

Haze (%) = diffused light / (diffuse transmitted light + parallel transmitted light)} X 100

The transmittance means the degree of transmission of light through a molded product, and can be calculated through the following equation (2).

[Equation 2]

Transmittance (%) = (Transmission energy / Projection energy) X 100

The molded article may have a haze value of 0.5% to 10%, for example, 1% to 5%, measured on the basis of a thickness of 1.5 mm to 2.5 mm. Also, the transmittance of the molded article may be 85% to 95%, for example 87% to 93%. This means that the molded article has high transparency.

The haze and the transmittance were values measured by the evaluation method defined in ASTM D1003 using Hazemeter NDH 2000 equipment of Nippon Denshoku Co.,

The molded article is also excellent in coloring property. The molded article may include a black colorant, wherein the L value of the CIE Lab color indicator of the molded article may be less than 28, specifically less than 26, based on black.

The L value indicates the brightness in the CIE color indicator. The higher the L value, the higher the brightness and the brighter the color feel, which means that the colorability is low. When the L value of the black molded article is less than 28, it means that the molded article has high colorability.

The L value is a value obtained by measuring L value based on SCI (Specular Component Included) using a CCM (Computer Color Matching) measuring instrument.

The molded article is excellent in scratch resistance. Specifically, the pencil hardness (JIS K 5401) of the molded article may be HB or higher, specifically, F or higher.

The molded article is excellent in weather resistance. In the present invention, L, a, b and ΔE values used in the International CIE Lab color display system are used as an index showing the weather resistance of the molded article. In the CIE Lab colorimetric system, the lightness is represented by L, and the chromaticity representing the color and saturation is indicated by a and b. The larger the value of a, the closer to red, and the smaller the value of a, the closer to green. The larger the b value, the closer to yellow, and the smaller the b value, the closer to blue.

In the CIE Lab colorimetric system, the color difference is represented by delta E (ΔE). The equation for calculating DELTA E is shown in the following equation 3.

[Equation 3]

The? E value of the molded article is measured after 3000 hours have elapsed under the SAE J 1960 condition, and may be 3 or less. This means that the molded article can have a low range of DELTA E value without color discoloration even after a long period of time. This also means that the molded article realizes excellent weather resistance.

The molded article is excellent in impact strength. Specifically, the 1/8 "Izod impact strength (ASTM D256) of the molded article may be from 3 to 12 kgf · cm / cm, such as from 5 kgf · cm / cm to 12 kgf · cm / cm, . ≪ / RTI >

Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples. However, the following examples and comparative examples are for illustrative purposes only and are not intended to limit the present invention.

Example  1 to 5 and Comparative Example  1 to 7

Each of the components shown in Table 1 below was mixed in the amounts shown in Table 1 below and extruded and processed to prepare a resin in the form of pellets. A twin-screw extruder having an L / D of 29 and a diameter of 45 mm was used for the extrusion, and the barrel temperature was set at 220 占 폚.

(Unit: wt%) Example Comparative Example One 2 3 4 5 One 2 3 4 5 6 7 (A) Impact modifier (A-1) 17 20 10 23 - - - - - - - - (A-2) - - - - 20 - - - - - - - (B) Acrylic resin 83 80 80 77 80 83 80 77 80 80 80 80 (C) Other impact reinforcement additives (C-1) - - 10 - - 17 20 23 15 - - - (C-2) - - - - - - - - - 20 15 15 (C-3) - - - - - - - - 5 - 5 - (C-4) - - - - - - - - - - - 5

The configurations shown in Table 1 are as follows.

(A) Shock Reinforcing agent

(A-1) 70 parts by weight of a rubber core having a refractive index of 1.49 copolymerized with butyl acrylate and butadiene in a weight ratio of 65:35, 30 parts by weight of methyl methacrylate was graft copolymerized to form a shell, An impact modifier (M-270, Kanaka) was used.

(A-2) 70 parts by weight of a rubber core having a refractive index of 1.49 copolymerized with butyl acrylate and butadiene in a weight ratio of 65:35, 30 parts by weight of methyl methacrylate was graft copolymerized to form a shell, An impact modifier having an in-core-shell structure was used.

(B) Acrylic resin

An acrylic resin (Cheil Industries, Inc.) having a refractive index of 1.49 and a weight average molecular weight of 100,000 g / mol obtained by polymerizing 2.5 parts by weight of methyl acrylate by a conventional suspension polymerization method was used in 97.5 parts by weight of methyl methacrylate.

(C) Other impact reinforcement additives

(C-1) A core-shell type transparent acrylic impact modifier having a rubber particle size of about 180 nm prepared by graft-copolymerizing 30 parts by weight of methyl methacrylate on 70 parts by weight of a rubber core having a refractive index of 1.49 copolymerized with butyl acrylate and styrene M-210 from Kaneka Co.) was used.

50 parts by weight of (C-2) butyl acrylate rubber was mixed with 50 parts by weight of a monomer mixture composed of 25% by weight of acrylonitrile and 75% by weight of styrene to obtain a core-shell acrylic impact- Reinforcing agent was prepared and used.

(C-3) To 55 parts by weight of butadiene rubber, 45 parts by weight of a monomer mixture composed of 75% by weight of methyl methacrylate, 5% by weight of acrylonitrile and 20% by weight of styrene was graft- - Shell type butadiene impact modifier was prepared and used.

(C-4) A core-shell type butadiene impact modifier having a rubber particle size of about 250 nm prepared by graft-copolymerizing 45 parts by weight of a monomer mixture composed of 25% by weight of acrylonitrile and 75% by weight of styrene, Were prepared and used.

Evaluation example  1: Transparency ( Hayes  And transmittance) measurement

Each of the components shown in Table 1 was mixed in respective amounts to prepare a resin composition, which was then extruded and processed to produce a resin in the form of a pellet. Extrusion was carried out using a biaxial extruder with L / D = 29 and a diameter of 45 mm, and the barrel temperature was set at 220 캜.

The pellets were dried at 80 ° C. for 2 hours, and then a cylinder temperature of 230 ° C. and a mold temperature of 60 ° C. were set using a 6-oz injection molding machine to prepare specimens having a size of 9 cm × 5 cm × 0.2 cm. The prepared specimens were measured for haze and transmittance, and the results are shown in Table 2 below.

The transparency of the specimen can be evaluated by the haze and the transmittance (TT) of the specimen. For 2.0 mm thick specimens, a hazemeter NDH 2000 instrument of Nippon Denshoku Co., Ltd. was used to evaluate the transparency of the specimen by the evaluation method specified in ASTM D1003 Respectively.

The lower the haze and the higher the transmittance, the better the transparency.

Example Comparative Example One 2 3 4 5 One 2 3 4 5 6 7 Haze (%) 2.5 2.7 2.2 3.1 2.5 2.1 2.4 2.5 11.8 61.3 60.9 72.1 Transmittance (%) 91.5 91.2 91.6 90.9 91.4 91.7 91.5 91.1 73.0 45.1 47.3 41.9

Referring to Table 2, in Examples 1 to 5, all of haze and transparency showing transparency were similar to those of Comparative Examples 1 to 3 in which only an acrylic impact modifier was applied, and the acryl impact modifier had a butadiene impact Which is superior to Comparative Examples 4 to 7 in which a reinforcing agent is applied together.

Evaluation example  2 to Evaluation example  6

Each of the components shown in Table 1 was mixed in the respective amounts to prepare a resin composition. Then, 0.3 part by weight of a coloring agent HIBLACK 50 L was added to 100 parts by weight of the resin composition, and extruded and processed to prepare a resin in the form of pellets. A twin-screw extruder having an L / D of 29 and a diameter of 45 mm was used for the extrusion, and the barrel temperature was set at 220 占 폚.

The pellets were dried at 80 ° C. for 2 hours, and then a cylinder temperature of 230 ° C. and a mold temperature of 60 ° C. were set using a 6-oz injection molding machine to prepare specimens having a size of 9 cm × 5 cm × 0.2 cm. The properties of the prepared specimens were measured by the following method. The results are shown in Table 3 below.

Evaluation example  2: Colorability  evaluation

The L value was measured based on SCI using CCM measuring equipment.

Evaluation example  3: Color  evaluation

The black color feeling as seen by the naked eye was evaluated based on the following criteria.

?: Very excellent,?: Excellent,?: Fair, X: poor, XX: very poor

Evaluation example  4: Scratch resistance  evaluation

The pencil hardness was measured by the evaluation method prescribed in JIS K 5401.

Evaluation example  5: Evaluation of weatherability

The color change (ΔE) was measured by the evaluation method defined in SAE J 1960.

Evaluation example  6: Impact strength evaluation

A notch was made in a 1/8 "Izod (IZOD) specimen by the evaluation method specified in ASTM D256.

Example Comparative Example One 2 3 4 5 One 2 3 4 5 6 7 Colorability (L value) 24.3 24.5 24.7 24.6 24.4 25 25.2 25.3 25.9 26.5 26.4 27.1 Color ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ △ X X XX Scratch resistance (pencil hardness) H H H F H H H F F F F HB Weatherability
(dE, 3000 hours) 2.3 2.5 2.4 2.7 2.4 2.2 2.4 2.5 2.8 2.7 2.9 3.8 Izod impact strength (kgf · cm / cm) 5.6 7.5 5.5 8.9 6 3.1 4.5 5 6 7.1 8.2 9

Referring to Table 3, it can be seen that Examples 1 to 5 have excellent coloring properties, color feeling, scratch resistance and weather resistance, and high Izod impact strength.

In Examples 1 to 5, the L value of the CIE color indicator was 24.3 to 24.7, which was lower than that of Comparative Examples 1 to 7. This means that the coloring property of black is excellent. Also, in Examples 1 to 5, the color feeling was evaluated as being 'excellent'. The pencil hardness was also evaluated as F or H in Examples 1 to 5, indicating that scratch resistance is also excellent. The dE values of Examples 1 to 5 were 2.3 to 2.7, and in particular, they were superior to those of Comparative Examples 4 to 7 in weather resistance. The Izod impact strength was 5.5 to 8.9 kgf · cm / cm, and the Examples 1 to 5 were also excellent in impact strength.

On the other hand, Comparative Examples 1 to 3 to which the transparent acrylic impact modifier (C-1) was applied exhibited excellent coloring property, but the Izod impact strength was not good. In the case of Comparative Example 4 in which the transparent acrylic impact modifier (C-1) and the butadiene impact modifier (C-3) were mixed, the impact strength was good, but the coloring property and color feeling were lower than those in Examples, The weatherability tends to decrease. In Comparative Example 6 and Comparative Example 7 in which Comparative Example 5 in which the acrylic impact modifier (C-2) was applied and the butadiene impact modifier in the (C-2) acrylic impact modifier and (C-4) The strength is excellent, but the coloring property and the color feeling are remarkably inferior to those of the examples, and the scratch resistance and weather resistance tend to be significantly lower than those of the examples.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims. As will be understood by those skilled in the art. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

Claims (14)

(A) 5 to 40% by weight of an impact modifier having a core-shell structure in which an acrylic compound is grafted on a rubber core copolymerized with an acrylic monomer and a diene monomer, and
(B) 60 to 95% by weight of an acrylic resin having a refractive index of 1.480 to 1.495,
The refractive index difference between the impact modifier (A) and the acrylic resin (B) is 0.001 to 0.2
Transparent thermoplastic resin composition.
The method of claim 1,
In the rubber core of the impact modifier (A)
Wherein the content ratio of the acrylic monomer to the diene monomer is 99: 1 to 50:50 by weight.
The method of claim 1,
With respect to 100 wt% of the impact modifier (A)
The content of the rubber core is 30 wt% to 80 wt%
Wherein the content of the shell is 20 wt% to 70 wt%.
The method of claim 1,
Wherein the impact modifier (A) has a particle diameter of 50 nm to 500 nm.
The method of claim 1,
Wherein the impact modifier (A) has a glass transition temperature of -70 캜 to -55 캜.
The method of claim 1,
Wherein the refractive index of the impact modifier (A) is 1.474 to 1.496.
The method of claim 1,
The acrylic thermoplastic resin (B) has a weight average molecular weight of 50,000 g / mol to 200,000 g / mol.
The method of claim 1,
The transparent thermoplastic resin composition
(C) a transparent thermoplastic resin composition having a core-shell structure in which a shell is formed by grafting an acrylic compound onto a rubber core copolymerized with an acrylic monomer of C4 to C30 and an aromatic vinyl monomer.
A molded article using the transparent thermoplastic resin composition according to any one of claims 1 to 8.
The method of claim 9,
As a value measured based on the thickness of 1.5 mm to 2.5 mm
The haze of the molded article is 0.5% to 10%
Wherein the molded article has a transmittance of 85% to 95%.
The method of claim 9,
Wherein the molded article comprises a black colorant,
Wherein the L value of the International CIE color indicator of the molded article is less than 28. < RTI ID = 0.0 > 18. < / RTI >
The method of claim 9,
The molded article has a pencil hardness (JIS K 5401) of at least HB.
The method of claim 9,
The molded article has a ΔE value measured after 3000 hours passed under SAE J 1960 conditions of 3 or less.
The method of claim 9,
The 1/8 "Izod impact strength (ASTM D256) of the molded article is 3 to 12 kgf · cm / cm.