KR101620667B1 - Thermoplastic resin composition and article comprising the same - Google Patents

Abstract

The thermoplastic resin composition of the present invention comprises (A) 10 to 90% by weight of a polycarbonate resin; And (B) 10 to 90% by weight of a (meth) acryl-based copolymer having a weight average molecular weight of 3,000 to 15,000 g / mol and containing a (meth) acrylic acid ester having an alkyl group having 10 to 20 carbon atoms as a monomer, And a control unit. The thermoplastic resin composition is excellent in transparency, fluidity, scratch resistance and compatibility.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoplastic resin composition,

The present invention relates to a thermoplastic resin composition and a molded article comprising the same. More specifically, the present invention relates to a thermoplastic resin composition excellent in transparency, fluidity, scratch resistance and compatibility, including a polycarbonate resin and an ultra-low molecular weight (meth) acrylic copolymer including a flexible structure, and a molded article comprising the thermoplastic resin composition .

BACKGROUND ART [0002] In recent years, there has been a demand for high performance and versatility for thermoplastic resins used as materials for external use or automobiles of electrical and electronic products. Particularly, there is an increasing demand for flame retardancy which ensures stability against fire with high texture and scratch resistance.

An acrylic resin capable of exhibiting scratch resistance, particularly a polymethyl methacrylate (PMMA) resin, which is a commonly used resin, is excellent in transparency and weatherability, and is excellent in mechanical strength, surface gloss and adhesive force. However, it is disadvantageous in that the impact resistance and the flame retardancy are very low.

In order to achieve both scratch resistance and flame retardancy, a method of adding a flame retardant capable of exhibiting flame retardancy during polymethyl methacrylate (PMMA) resin processing with excellent scratch resistance of pencil hardness 3H to 4H has been attempted. However, in order to exhibit flame retardancy, a high content of a flame retardant should be added. Therefore, this method suffers from the environmental limitation that the flame retardant monomer can be extracted from the resin to the outside, and the mechanical property of the resin is lowered.

In addition, for scratch resistance and flame retardance, acrylic resins, especially polymethyl methacrylate resins, can be mixed with polycarbonate resins and the like that have excellent mechanical strength such as impact resistance and flame retardancy. Related prior arts are disclosed in Japanese Patent Laid-Open No. 1993-140435. The patent discloses a polycarbonate resin composition comprising 70 to 99% by weight of a polycarbonate resin and 1 to 30% by weight of a low molecular weight acrylic copolymer and having improved flowability.

However, when acrylic resin is mixed with polycarbonate resin or the like which is a high refractive index resin, transparency and deterioration of coloring property may be caused due to difference in refractive index.

Accordingly, a thermoplastic resin composition having both transparency, fluidity, scratch resistance, and compatibility is required even when a polycarbonate resin and an acrylic resin are used in combination.

An object of the present invention is to provide a thermoplastic resin composition excellent in flowability, scratch resistance, transparency and compatibility.

Another object of the present invention is to provide a thermoplastic resin composition excellent in coloring property.

Another object of the present invention is to provide a thermoplastic resin composition having excellent transparency, scratch resistance and flowability without any other compatibilizer.

It is still another object of the present invention to provide a molded article formed from the thermoplastic resin composition.

The above and other objects of the present invention can be achieved by the present invention described below.

One aspect of the present invention relates to a thermoplastic resin composition. Wherein the thermoplastic resin composition comprises (A) 10 to 90% by weight of a polycarbonate resin; And (B) 10 to 90% by weight of a (meth) acryl-based copolymer having a weight average molecular weight of 3,000 to 15,000 g / mol and containing a (meth) acrylic acid ester having an alkyl group having 10 to 20 carbon atoms as a monomer, And a control unit.

In an embodiment, the (meth) acrylic copolymer may have a refractive index of 1.495 to 1.590.

(B1) 1 to 30% by weight of a (meth) acrylic acid ester monomer having an alkyl group having 10 to 20 carbon atoms, (b2) an aromatic or alicyclic (meth) acrylate monomer represented by the following general formula ) Acrylate monomers, and (b3) 9 to 90% by weight of a reactive unsaturated monomer.

[Chemical Formula 1]

Wherein R ₁ is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, X is a substituted or unsubstituted cycloalkyl group having 5 to 20 carbon atoms or a substituted or unsubstituted aryl group having 6 to 20 carbon atoms, m Is an integer from 0 to 10;

(2)

In the formula (2), R ₂ is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, Y is an oxygen atom (O) or a sulfur atom (S), Ar is a substituted or unsubstituted cycloalkyl group having 5 to 20 carbon atoms, A substituted or unsubstituted aryl group having 6 to 20 carbon atoms, and n is an integer of 0 to 10.

Preferably, the reactive unsaturated monomer may include at least one of a (meth) acrylic acid ester having an alkyl group having 1 to 9 carbon atoms, an unsaturated carboxylic acid, an unsaturated carboxylic acid anhydride, an unsaturated carboxylic acid ester having a hydroxyl group, and an unsaturated carboxylic acid amide.

In an embodiment, the thermoplastic resin composition is a flame retardant, a surfactant, a nucleating agent, a coupling agent. And may further include at least one of a filler, a plasticizer, an impact modifier, a lubricant, an antibacterial agent, a releasing agent, a heat stabilizer, an antioxidant, a light stabilizer, a compatibilizer, an inorganic additive, a lubricant, an antistatic agent, a pigment, a dye and a flame retardant.

In an embodiment, the thermoplastic resin composition may have a total transmittance of 80% or more measured by a haze meter based on a specimen of 2.5 mm in thickness.

In an embodiment, the thermoplastic resin composition may have a flow length of 15 to 25 inches measured at 250 DEG C by a spiral flow test method based on EMMI 1-66.

In an embodiment, the thermoplastic resin composition may have a scratch width of 310 to 280 탆 by a Ball-type Scratch Profile Test.

Another aspect of the present invention relates to a molded article. The molded article is formed from the thermoplastic resin composition.

Disclosed is a thermoplastic resin composition which is excellent in flowability, scratch resistance, transparency, compatibility, colorability and the like, and which has excellent transparency, scratch resistance and flowability without any other compatibilizer, and the effect of the present invention which provides a molded article formed therefrom I have.

Hereinafter, the present invention will be described in detail.

The thermoplastic resin composition according to the present invention comprises (A) 10 to 90% by weight of a polycarbonate resin; And (B) 10 to 90% by weight of a (meth) acryl-based copolymer having a weight average molecular weight of 3,000 to 15,000 g / mol and containing a (meth) acrylic acid ester having an alkyl group having 10 to 20 carbon atoms as a monomer, And a control unit.

In this specification, "(meth) acrylic" means that both "acrylic" and "methacrylic" are possible unless otherwise stated. For example, "(meth) acrylate" means that both "acrylate" and "methacrylate" are possible.

(A) Polycarbonate resin

The polycarbonate resin used in the present invention may be a linear polycarbonate resin, a branched polycarbonate resin, a polyester carbonate copolymer resin, a mixture thereof, or the like.

The linear polycarbonate resin may include a resin prepared using a conventional production method of a phenolic compound, for example, a dihydric phenolic compound and phosgene, in the presence of a molecular weight modifier and a catalyst. In addition, the linear polycarbonate resin may include a resin prepared by ester interchange reaction of a phenolic compound, for example, a dihydroxy phenolic compound and a carbonate precursor, such as diphenyl carbonate.

The branched polycarbonate resin may include, for example, those prepared by reacting a polyfunctional aromatic compound such as trimellitic anhydride or trimellitic acid with a dihydric phenolic compound and a carbonate precursor, no.

The polyester carbonate copolymer resin may include, but is not limited to, for example, those prepared by reacting a bifunctional carboxylic acid with a dihydric phenolic compound and a carbonate precursor.

The dihydroxy phenolic compound may include a bisphenol compound, for example, 2,2-bis (4-hydroxyphenyl) propane ("bisphenol A") and the like. At this time, the bisphenol A may be partially or wholly replaced by other dihydric phenol compounds.

Other dihydroxy phenolic compounds that can be used include hydroquinone, 4,4'-dihydroxydiphenyl, bis (4-hydroxyphenyl) methane, 1,1- bis (4- hydroxyphenyl) cyclohexane, Bis (4-hydroxyphenyl) sulfone, bis (4-hydroxyphenyl) sulfoxide, bis , Bis (4-hydroxyphenyl) ketone or bis (4-hydroxyphenyl) ether or halogenated bisphenol such as 2,2-bis (3,5-dibromo-4-hydroxyphenyl) But is not limited thereto.

The polycarbonate resin may be a homopolymer containing one dihydric phenolic compound, a copolymer containing two or more dihydric phenolic compounds, or a mixture thereof.

The polycarbonate resin may have a weight average molecular weight measured by GPC of 10,000 to 50,000 g / mol, but is not limited thereto. And preferably from 15,000 to 35,000 g / mol.

In the present invention, the polycarbonate resin may be contained in an amount of 10 to 90% by weight of the total thermoplastic resin composition. Within this range, the compatibility of the two kinds of resins during blending is not reduced, transparency and impact resistance are not lowered, and scratch resistance can be improved. Preferably 60 to 90% by weight, and more preferably 70 to 80% by weight.

(B) a (meth) acrylic copolymer

The (meth) acrylic copolymer used in the present invention has a weight average molecular weight as measured by GPC of 3,000 to 15,000 g / mol. When the weight average molecular weight of the (meth) acrylic copolymer is less than 3,000 g / mol, the thermoplastic resin composition may be decomposed during the production or processing of the thermoplastic resin composition. If the weight average molecular weight exceeds 15,000 g / mol, the transparency and fluidity of the thermoplastic resin composition may be deteriorated. Preferably from 3,000 to 12,000 g / mol, more preferably from 10,000 to 15,000 g / mol, and most preferably from 11,000 to 13,000 g / mol.

The (meth) acrylic copolymer may have a refractive index of 1.495 to 1.590. Within this range, compatibility with polycarbonate resin having a high refractive index can be excellent. Preferably, the refractive index may be 1.500 to 1.540.

The (meth) acrylic copolymer is (b1) a copolymer of a monomer mixture containing a (meth) acrylic acid ester having an alkyl group having 10 to 20 carbon atoms. The (meth) acrylic copolymer has a flexible structure by including a (meth) acrylic acid ester having an alkyl group having 10 to 20 carbon atoms, preferably 11 to 20, and more preferably 12 to 20 carbon atoms as a monomer, The fluidity of the composition can be increased, and at the same time the scratch resistance and transparency can be improved.

In the (meth) acrylic acid ester having an alkyl group having 10 to 20 carbon atoms, the alkyl group having 10 to 20 carbon atoms may be, for example, a straight chain alkyl group having 10 to 20 carbon atoms. In this case, more excellent fluidity can be obtained.

Specific examples of the (meth) acrylic acid ester having an alkyl group having 10 to 20 carbon atoms include, but are not limited to, lauryl (meth) acrylate, stearyl (meth) acrylate, and mixtures thereof.

The (meth) acrylic acid ester monomer having an alkyl group having 10 to 20 carbon atoms may be contained in an amount of 1 to 30% by weight of the (meth) acrylic copolymer (entire monomer mixture). Within the above range, transparency, fluidity and scratch resistance of the thermoplastic resin composition can be improved. Preferably 5 to 15% by weight.

(B2) an aromatic or alicyclic (meth) acrylate monomer represented by the following general formula (1) or (2): (meth) acrylate monomer having an alkyl group of 10 to 20 carbon atoms, b3) a reactive unsaturated monomer.

[Chemical Formula 1]

Wherein R ₁ is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, X is a substituted or unsubstituted cycloalkyl group having 5 to 20 carbon atoms or a substituted or unsubstituted aryl group having 6 to 20 carbon atoms, m Is an integer of 0 to 10.

Preferably, X may be a cyclohexyl group, a phenyl group, a methylphenyl group, a methylethylphenyl group, a methoxyphenyl group, a propylphenyl group, a cyclohexylphenyl group, a chlorophenyl group, a bromophenyl group, a phenylphenyl group or a benzylphenyl group.

(2)

In the formula (2), R ₂ is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, Y is an oxygen atom (O) or a sulfur atom (S), Ar is a substituted or unsubstituted cycloalkyl group having 5 to 20 carbon atoms, A substituted or unsubstituted aryl group having 6 to 20 carbon atoms, and n is an integer of 0 to 10.

Preferably, Ar may be a cyclohexyl group, a phenyl group, a methylphenyl group, a methylethylphenyl group, a methoxyphenyl group, a cyclohexylphenyl group, a chlorophenyl group, a bromophenyl group, a phenylphenyl group or a benzylphenyl group.

The substituent for the "substitution" is an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, a cycloalkyl group having 5 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms, an aralkyl group having 7 to 12 carbon atoms, .

Specific examples of the aromatic or alicyclic (meth) acrylate monomers include benzyl (meth) acrylate, cyclohexyl (meth) acrylate, phenoxy (meth) acrylate, 2-ethylphenoxy (Meth) acrylate, 2-ethylthiophenyl (meth) acrylate, 2-phenylethyl (meth) acrylate, 2- Methylphenyl (meth) acrylate, 2- (4-propylphenyl) ethyl (meth) acrylate, 2- (Meth) acrylate, 2 (4-methoxyphenyl) ethyl (meth) acrylate, 2- 2- (3-chlorophenyl) ethyl (meth) acrylate, 2- (4-chlorophenyl) (Meth) acrylate, 2- (4-bromophenyl) ethyl (meth) acrylate, 2- Acrylate, mixtures thereof, and the like, but are not limited thereto.

The refractive index of the aromatic or alicyclic (meth) acrylate monomer may be 1.500 to 1.590.

The aromatic or alicyclic (meth) acrylate monomer may be contained in an amount of 9 to 90% by weight of the (meth) acrylic copolymer. Within the above range, compatibility, transparency, fluidity and scratch resistance of the thermoplastic resin composition can be enhanced. Preferably 30 to 50% by weight.

The reactive unsaturated monomer is not particularly limited, but a monofunctional unsaturated monomer may be used. For example, the monofunctionally unsaturated monomer may include (meth) acrylic acid esters, unsaturated carboxylic acids, unsaturated carboxylic acid anhydrides, unsaturated carboxylic acid esters including hydroxy groups, unsaturated carboxylic acid amides, mixtures thereof and the like, no.

Specific examples of the reactive unsaturated monomer include (meth) acrylic acid esters having an alkyl group having 1 to 9 carbon atoms including methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, 2-ethylhexyl acrylate and the like; Unsaturated carboxylic acids including acrylic acid, methacrylic acid and the like; Unsaturated carboxylic acid anhydrides including maleic anhydride and the like; An unsaturated carboxylic acid ester including a hydroxy group including 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, monoglycerol acrylate and the like; Unsaturated carboxylic acid amides including acrylamide or methacrylamide; And mixtures thereof, but are not limited thereto.

The reactive unsaturated monomer may be contained in an amount of 9 to 90% by weight of the (meth) acrylic copolymer. Within the above range, transparency, fluidity and scratch resistance of the thermoplastic resin composition can be improved. Preferably 40 to 60% by weight.

The (meth) acrylic copolymer can be produced by a usual polymerization method. For example, the monomer mixture comprising the (meth) acrylic acid ester monomer having an alkyl group of 10 to 20 carbon atoms and, if necessary, the aromatic or alicyclic (meth) acrylate monomer, the reactive unsaturated monomer, Or suspension polymerization, but are not limited thereto.

The thermoplastic resin composition according to the present invention can be suitably used as a flame retardant agent, a surfactant, a nucleating agent, a coupling agent, a filler, a plasticizer, an impact modifier, a lubricant, an antibacterial agent, a release agent, a heat stabilizer, an antioxidant, a light stabilizer, a compatibilizer, , Coloring agents such as pigments and dyes, flame retardants, mixtures thereof, and the like, but are not limited thereto.

The thermoplastic resin composition of the present invention may have a flow length of 15 to 25 inches, preferably 16 to 22 inches, measured at 250 DEG C by a spiral flow test method based on EMMI 1-66.

The thermoplastic resin composition may have a total transmittance of 80% or more, preferably 85% or more, more preferably 85 to 95%, measured by a haze meter on a specimen of 2.5 mm in thickness.

The thermoplastic resin composition may have a scratch resistance of 310 to 280 탆, preferably 300 to 280 탆, by a ball-type scratch profile test.

The thermoplastic resin composition of the present invention can have excellent transparency, scratch resistance and fluidity without any other compatibilizer.

The molded article according to the present invention can be formed from the thermoplastic resin composition.

The thermoplastic resin composition may be melt-extruded in an extruder after the components and other additives are mixed at the same time, and may be produced in the form of pellets. The produced pellets can be manufactured into various molded articles through various molding methods such as injection molding, extrusion molding, vacuum molding, and casting molding. The molding method is well known to those of ordinary skill in the art to which the present invention pertains.

The molded article can include various plastic molded articles and the like and can be widely applied to optical products, parts of electric and electronic products, exterior materials, automobile parts, sundry goods, structural materials and the like because of its excellent transparency, fluidity, scratch resistance and compatibility .

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.

The contents not described here are sufficiently technically inferior to those skilled in the art, and a description thereof will be omitted.

Example

Manufacturing example  One: ( Meta ) Acrylic copolymer 1

A flexible structure having a refractive index of 1.520 and a weight average molecular weight of 12,000 g / mol was prepared by the ordinary suspension polymerization method using 40% by weight of benzyl methacrylate, 50% by weight of methyl methacrylate and 10% by weight of stearyl methacrylate (Meth) acrylic copolymer was prepared.

Manufacturing example  2: ( Meta ) Acrylic copolymer 2

A flexible structure having a refractive index of 1.520 and a weight average molecular weight of 12,000 g / mol was prepared by ordinary suspension polymerization method using 40% by weight of benzyl methacrylate, 50% by weight of methyl methacrylate and 10% by weight of lauryl methacrylate (Meth) acrylic copolymer was prepared.

Manufacturing example  3: ( Meta ) Acrylic copolymer 3

A flexible structure having a refractive index of 1.520 and a weight average molecular weight of 20,000 g / mol was prepared by a conventional suspension polymerization method using 40% by weight of benzyl methacrylate, 50% by weight of methyl methacrylate and 10% by weight of stearyl methacrylate (Meth) acrylic copolymer was prepared.

Manufacturing example  4: ( Meta ) Acrylic copolymer 4

A flexible structure having a refractive index of 1.520 and a weight average molecular weight of 130,000 g / mol was prepared by the ordinary suspension polymerization method using 40% by weight of benzyl methacrylate, 50% by weight of methyl methacrylate and 10% by weight of stearyl methacrylate (Meth) acrylic copolymer was prepared.

Manufacturing example  5: ( Meta ) Acrylic copolymer 5

A flexible structure having a refractive index of 1.520 and a weight average molecular weight of 130,000 g / mol was prepared by a conventional suspension polymerization method using 40% by weight of benzyl methacrylate, 50% by weight of methyl methacrylate and 10% by weight of lauryl methacrylate (Meth) acrylic copolymer was prepared.

Manufacturing example  6: ( Meta ) Acrylic copolymer 6

A (meth) acrylic copolymer having a refractive index of 1.490 and a weight average molecular weight of 12,000 g / mol was prepared by a conventional suspension polymerization method using 100% by weight of methyl methacrylate.

Manufacturing example  7: ( Meta ) Acrylic copolymer 7

A (meth) acrylic copolymer having a refractive index of 1.520 and a weight average molecular weight of 12,000 g / mol was prepared by a conventional suspension polymerization method using 40% by weight of benzyl methacrylate and 60% by weight of methyl methacrylate.

Specific specifications of the components used in the following examples and comparative examples are as follows.

(A) Polycarbonate resin

Bisphenol-A type linear polycarbonate resin (weight average molecular weight: 25,000 g / mol, PANLITE-1250WP, manufactured by TEIJIN Japan) was used.

(B) a (meth) acrylic copolymer

(B1) The (meth) acrylic copolymer prepared in Production Example 1 was used.

(B2) The (meth) acrylic copolymer prepared in Production Example 2 was used.

(B3) The (meth) acrylic copolymer prepared in Production Example 3 was used.

(B4) The (meth) acrylic copolymer prepared in Production Example 4 was used.

(B5) The (meth) acrylic copolymer prepared in Production Example 5 was used.

(B6) The (meth) acrylic copolymer prepared in Production Example 6 was used.

(B7) The (meth) acrylic copolymer prepared in Preparation Example 7 was used.

(C) Stearyl acetate was used as the lubricant.

Example  One

80 parts by weight of a polycarbonate resin and 20 parts by weight of a (meth) acrylic copolymer resin were melted and extruded using a twin-screw extruder having L / D = 36 and 45 mm in diameter to prepare pellets. The prepared pellets were dried at 80 ° C for 6 hours and then injected in a 6 Oz injector to prepare specimens of L 90 mm x W 50 mm xt 2.5 mm.

Example  2 to 4

A specimen having L 90 mm x W 50 mm xt 2.5 mm was prepared in the same manner as in Example 1, except that the type and content of the (meth) acrylic copolymer were changed as shown in Table 1 below.

Comparative Example  1 to 6

Except that the type and content of the (meth) acrylic copolymer were changed as shown in Table 1, or stearyl acetate was further added as the lubricant, L 90 mm x W 50 mm xt 2.5 mm .

Example Comparative Example One 2 3 4 One 2 3 4 5 6 (A) 70 80 70 80 70 70 70 70 70 70 (B) (B1) 30 20 - - - - - - - - (B2) - - 30 20 - - - - - - (B3) - - - - 30 - - - - - (B4) - - - - - 30 - - - - (B5) - - - - - - 30 - - - (B6) - - - - - - - 30 - - (B7) - - - - - - - - 30 30 (C) - - - - - - - - - 30 (K) of the weight average molecular weight (B) 12K 12K 12K 12K 20K 130K 130K 12K 12K 12K (B) is included in the flexible structure include include include include include include include Without Without Without

Experimental Example

The properties of the prepared specimens were measured and evaluated according to the following physical property evaluation methods, and the results are shown in Table 2 below.

Property evaluation method

(1) Flow mark: The flow mark of the outer surface of the resin surface was visually observed and evaluated as the presence or absence of a flow mark.

(2) Transparency: The appearance of the resin surface was visually observed and evaluated as transparent / translucent.

(3) Total transmittance (unit:%): Haze meter Total light transmittance was measured using an NDH 2000 instrument (Nippon Denshoku). The total transmitted light is calculated as the sum of the diffused transmitted light (DF) and the parallel transmitted light (PT). The higher the total transmitted light, the better the transparency.

(4) Spiral flow (unit: inch): The flow length was measured using a transfer molding press at 250 占 폚 according to EMMI 1-66.

(5) Scratch resistance (unit: 占 퐉): Scratch resistance was evaluated by BSP (Ball-type Scratch Profile) test. A scratch of 10 to 20 mm in length was applied to the resin surface using a metal tip of 0.7 mm in diameter with a load of 1,000 g and an internal scratch rate of 75 mm / min. The profile of the applied scratch was measured through a surface scan using a tip of a metal stylus having a diameter of 2 탆 through a contact type surface profile analyzer (XP-1, Ambio), and the scale of scratch resistance from the measured scratch profile ([Mu] m) was determined. The scratch resistance increases as the measured scratch width decreases.

Example Comparative Example One 2 3 4 One 2 3 4 5 6 Flow mark none none none none none none none none none has exist transparency Transparency Transparency Transparency Transparency Translucent Translucent Translucent Translucent Transparency Translucent Transmitted light (%) 88.86 87.24 88.68 87.05 40.02 37.18 38.61 68.9 87.62 35.15 Spiral flow
(inch) 18 20 16 18 12 11 11 12 13 15 BSP
(탆) 293.8 284.2 294.7 285.5 285.7 289.6 293.7 284.6 283.4 300.2

From the results shown in Table 2, it can be seen that the test piece made of the thermoplastic resin composition of the present invention is remarkably excellent in compatibility, transparency, fluidity, and scratch resistance.

On the other hand, it can be seen that the thermoplastic resin compositions (Comparative Examples 1 to 3) containing a (meth) acrylic copolymer containing a flexible structure but having a weight average molecular weight outside the scope of the present invention have poor transparency and fluidity .

It is also seen that the thermoplastic resin compositions (Comparative Examples 4 and 5) containing a (meth) acrylic copolymer not containing a flexible structure (Comparative Examples 4 and 5) have low fluidity even when the weight average molecular weight is in the range of 3,000 to 15,000 g / , And in Comparative Example 4 in which the aromatic (meth) acrylate monomer is not contained, the transparency is also lowered.

In addition, in the case of the thermoplastic resin composition (Comparative Example 6) further comprising stearyl acetate used as a lubricant in Comparative Example 5, the fluidity was improved as compared with Comparative Example 5, but the transparency and the transparency of the thermoplastic resin composition The scratch resistance is degraded.

For reference, a thermoplastic resin composition containing a (meth) acrylic copolymer having a weight average molecular weight of less than 3,000 g / mol is difficult to produce the copolymer itself and specimens, and the mechanical properties such as impact strength, etc., .

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 invention as defined by the appended claims.

Claims (9)

(A) 10 to 90% by weight of a polycarbonate resin; And
(B) 10 to 90% by weight of a (meth) acrylic copolymer having a weight average molecular weight of 3,000 to 15,000 g / mol and containing a (meth) acrylic acid ester having an alkyl group having 10 to 20 carbon atoms as a monomer And a thermoplastic resin composition.
The thermoplastic resin composition according to claim 1, wherein the (meth) acrylic copolymer has a refractive index of 1.495 to 1.590.
The composition according to claim 1, wherein the (meth) acrylic copolymer is a copolymer of (b1) 1 to 30% by weight of a (meth) acrylic acid ester monomer having an alkyl group of 10 to 20 carbon atoms, (b2) an aromatic or alicyclic (Meth) acrylate monomer, and (b3) 9 to 90% by weight of a reactive unsaturated monomer. The thermoplastic resin composition according to claim 1,
[Chemical Formula 1]

Wherein R ₁ is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, X is a substituted or unsubstituted cycloalkyl group having 5 to 20 carbon atoms or a substituted or unsubstituted aryl group having 6 to 20 carbon atoms, m Is an integer from 0 to 10;
(2)

In the formula (2), R ₂ is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, Y is an oxygen atom (O) or a sulfur atom (S), Ar is a substituted or unsubstituted cycloalkyl group having 5 to 20 carbon atoms, A substituted or unsubstituted aryl group having 6 to 20 carbon atoms, and n is an integer of 0 to 10.
4. The thermosetting resin composition according to claim 3, wherein the reactive unsaturated monomer comprises at least one of a (meth) acrylic acid ester having an alkyl group having 1 to 9 carbon atoms, an unsaturated carboxylic acid, an unsaturated carboxylic acid anhydride, an unsaturated carboxylic acid ester having a hydroxyl group, and an unsaturated carboxylic acid amide Wherein the thermoplastic resin composition is a thermoplastic resin composition.
The thermoplastic resin composition according to claim 1, wherein the thermoplastic resin composition is a flame retardant, a surfactant, a nucleating agent, or a coupling agent. And at least one of a filler, a plasticizer, an impact modifier, a lubricant, an antibacterial agent, a releasing agent, a heat stabilizer, an antioxidant, a light stabilizer, a compatibilizer, an inorganic additive, a lubricant, an antistatic agent, a pigment, And a thermoplastic resin composition.
The thermoplastic resin composition according to claim 1, wherein the thermoplastic resin composition has a thickness of 2.5 mm and a total transmittance of 80% or more as measured with a haze meter based on a specimen.
The thermoplastic resin composition according to claim 1, wherein the thermoplastic resin composition has a flow length of 15 to 25 inches measured at 250 DEG C by a spiral flow test method based on EMMI 1-66.
The thermoplastic resin composition according to claim 1, wherein the thermoplastic resin composition has a scratch width of 310 to 280 탆 by a Ball-type Scratch Profile Test.
A molded article formed from the thermoplastic resin composition according to any one of claims 1 to 8.