KR20150121392A - Silane based compound, method for preparing the same and polycarbonate resin composition comprising the same - Google Patents

Abstract

A silane-based compound of the present invention is represented by following chemical formula 1. When applying the silane-based compound, a polycarbonate resin composition having excellent rigidity and external appearance characteristics can be obtained without a decrease in fluidity. In the chemical formula 1, R_1 is a hydrogen atom or a substituted or unsubstituted hydrocarbon group having 1 to 5 carbon atoms; R_2 is a substituted or unsubstituted alkylene group having 2 to 10 carbon atoms; R_3 is a hydrogen atom, a substituted or unsubstituted hydrocarbon group having 1 to 20 carbon atoms, or a substituted or unsubstituted acyl group having 2 to 20 carbon atoms; Ar is a substituted or unsubstituted arylene group having 5 to 12 carbon atoms; a and b are each independently an integer of 1 to 3; a+b equals 4; m is an integer of 0 to 5; and the average value of n is 5 to 50.

Description

Technical Field [0001] The present invention relates to a silane-based compound, a method for producing the same, and a polycarbonate resin composition containing the same. BACKGROUND ART [0002]

The present invention relates to a silane-based compound, a process for producing the same, and a polycarbonate resin composition containing the same. More particularly, the present invention relates to a novel polycarbonate resin composition having a novel structure, a method for producing the same, and a method for producing the same, which can prevent or reduce decrease in molecular weight of a resin due to inorganic fillers and additives, will be.

When the inorganic filler such as glass fiber, silica, or talc is blended into the thermoplastic resin and / or the thermosetting resin, the tear strength, tensile strength, flexural strength, flexural modulus, etc. of the resin can be improved due to inherent characteristics of the inorganic filler. A blend of a thermoplastic resin such as polycarbonate and an inorganic filler is usually used in a molded article requiring high rigidity, and in particular, it is widely used as an interior / exterior material for automobiles, electric and electronic products.

However, when an inorganic filler such as glass fiber is blended in the resin, the moldability is lowered, and injection problems may occur. Particularly, deterioration of external appearance, in which an inorganic filler protrudes on the surface of a molded article at the time of injection, may occur. Further, when the inorganic filler can not sufficiently bond with the resin, the rigidity may be lowered.

There is an attempt to improve the compatibility of the inorganic filler and the resin by increasing the fluidity as a method for improving the mechanical properties and the thermal characteristics of the conventional methods.

The patent document 10-2012-0075813 discloses a glass fiber reinforced polycarbonate resin composition having excellent flame retardancy, which comprises a mixture of a metal salt flame retardant, a fluorinated polyolefin resin, and a siloxane-based compound and a silicone resin composition in a glass fiber reinforced polycarbonate resin . In addition, Patent Document 10-2012-0057276 discloses a glass fiber-reinforced polycarbonate resin composition having improved color stability at a high temperature. The above-mentioned patents and the like can improve the high rigidity and flame retardancy of the resin composition due to the glass fiber reinforcement, but it is impossible to know the improvement due to the bonding between the resin and the inorganic filler, and the appearance characteristics are deteriorated, have.

JP-A 2003-395421, JP 2003-384757, JP 2004-029008 and the like refer to a flame retardant aromatic polycarbonate resin composition, and in particular, an aromatic additive containing an alkali metal, an alkaline earth metal salt, But the improvement of the impact resistance of the resin composition due to the interface bonding between the resin and the inorganic filler can not be known.

An object of the present invention is to provide a novel silane-based compound and a process for producing the same.

Another object of the present invention is to provide a polycarbonate resin composition which is capable of preventing or reducing a decrease in the molecular weight of a resin due to inorganic fillers, additives, and the like, and which is excellent in impact resistance, by applying the silane compound.

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 silane-based compounds. The silane-based compound is represented by the following formula (1)

[Chemical Formula 1]

Wherein R ₁ is a hydrogen atom or a substituted or unsubstituted hydrocarbon group having 1 to 5 carbon atoms, R ₂ is a substituted or unsubstituted alkylene group having 2 to 10 carbon atoms, R ₃ is a hydrogen atom, A substituted or unsubstituted arylene group having 2 to 20 carbon atoms, Ar is a substituted or unsubstituted arylene group having 6 to 12 carbon atoms, a and b each independently represent a substituted or unsubstituted C1 to C20 alkyl group, A + b is 4, m is an integer of 0 to 5, and the average value of n is 5 to 50. [

In an embodiment, the silane-based compound may have a weight average molecular weight of 1,000 to 17,000 g / mol.

Another aspect of the present invention relates to a method for producing the silane-based compound. The process comprises reacting a silane compound represented by the following formula (2) and a polyester compound represented by the following formula (3)

(2)

(3)

Wherein R ₁ , R ₂ , R ₃ , Ar, a, b, m and n are as defined in Formula 1 and X is a halogen atom, a hydroxyl group, a substituted or unsubstituted C1- Or a substituted or unsubstituted aryloxy group having 6 to 20 carbon atoms.

In an embodiment, the reaction can be carried out in an organic solvent at from 30 to 110 < 0 > C.

Another aspect of the present invention relates to a polycarbonate resin composition. Wherein the polycarbonate resin composition comprises a polycarbonate resin; A silane-based compound represented by Formula 1; And an inorganic filler.

In an embodiment, the content of the silane compound may be 0.5 to 20 parts by weight based on 100 parts by weight of the polycarbonate resin, and the content of the inorganic filler may be 5 to 50 parts by weight.

In an embodiment, the weight ratio of the silane compound and the inorganic filler may be 1: 2 to 30.

In an embodiment, the inorganic filler may comprise at least one of silica, talc, glass fiber, mica, wollastonite, basalt fiber and whisker.

In an embodiment, the silane-based compound may be present in a state where a part or all of the silane-based compound is chemically bonded to the inorganic filler.

In the specific examples, the polycarbonate resin composition has a tensile strength of 600 to 1,500 kgf / cm ^{2 as} measured according to ASTM D638, a flexural strength of 900 to 2,000 kgf / cm ^{2 as} measured according to ASTM D790, a flexural modulus Cm ³ / cm ² and the Izod impact strength of the 1/8 "thick specimen measured in accordance with ASTM D256 is in the range of 3 to 15 kgf · cm / cm 2, and the 1 mm thick specimen (FDI) impact strength of 5 to 40 J and a flow index (MI) of 10 to 80 g / 10 min as measured according to ASTM D1238.

The present invention relates to a novel silane-based compound, a method for producing the same, and a method for producing the polycarbonate resin composition, which can prevent or reduce decrease in the molecular weight of the resin due to inorganic fillers and additives by applying the silane- Effect.

1 is a ¹ H-NMR spectrum of a silane compound prepared according to Production Example 1 of the present invention.

Hereinafter, the present invention will be described in detail.

The silane compound according to the present invention is represented by the following formula (1).

[Chemical Formula 1]

R ₁ may be a hydrogen atom or a substituted or unsubstituted hydrocarbon group having 1 to 5 carbon atoms, for example, a methyl group, an ethyl group, a propyl group, a butyl group, and the like. R ₂ is a substituted or unsubstituted A propylene group, a butylene group, a pentylene group, a hexamethylene group, and the like, and R ₃ represents a hydrogen atom, a substituted or unsubstituted hydrocarbon group having 1 to 20 carbon atoms or a substituted or unsubstituted alkylene group having 1 to 20 carbon atoms, A substituted or unsubstituted C1 to C15 alkyl group or a substituted or unsubstituted C6 to C15 aryl group, a substituted or unsubstituted C7 to C20 aryl group, 16 < / RTI > acyl group, and the like. A and b are each independently an integer of 1 to 3, and a + b is 4, for example, a is 3, b is 1, and Ar is a substituted or unsubstituted arylene group having 6 to 12 carbon atoms. M is an integer of 0 to 5, and the average value of n may be 5 to 50, for example, 7 to 30, specifically 8 to 25.

In the specification of the present invention, the term "substituted" means that the hydrogen atom is replaced by a halogen group, an alkyl group having 1 to 30 carbon atoms, a haloalkyl group having 1 to 30 carbon atoms, an aryl group having 6 to 30 carbon atoms, a heteroaryl group having 2 to 30 carbon atoms, Substituted with a substituent such as an alkoxy group having 1 to 20 carbon atoms.

In an embodiment, the silane compound may have a weight average molecular weight (Mw) of 1,000 to 17,000 g / mol as measured by gel permeation chromatography (GPC), but is not limited thereto.

The method for preparing a silane compound according to the present invention comprises reacting a silane compound represented by the following formula (2) and a polyester compound represented by the following formula (3).

(2)

(3)

In Formula 2 and 3, R _1, R _2, R _3, Ar, a, b, m and n are as defined in Formula 1, X is a halogen atom, a chlorine atom (Cl), bromine (Br) , A substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, or a substituted or unsubstituted aryloxy group having 6 to 20 carbon atoms.

In an embodiment, the reaction can be carried out by stirring the reaction product in an organic solvent at a temperature of 30 to 110 DEG C, for example 60 to 100 DEG C, for example for 1 to 48 hours.

Examples of the organic solvent include toluene, dichloroethane (DCE), tetrahydrofuran (THF), and tetrachloroethane (TCE). The amount of the organic solvent to be used may be 200 to 1,000 parts by weight based on 100 parts by weight of the silane compound represented by the following formula (2) and the polyester compound represented by the following formula (3), but is not limited thereto.

Further, the above reaction can be carried out, if necessary, in the presence of a catalyst. Examples of the catalyst include, but are not limited to, pyridine, triethyleneamine (TEA), and the like. The catalyst may be used in an amount of 1 to 30 parts by weight based on 100 parts by weight of the silane compound represented by the formula (2) and the polyester compound represented by the following formula (3), but is not limited thereto.

In a specific example, the molar ratio of the silane compound represented by the formula (2) and the polyester compound represented by the following formula (3) to be added to the above production method may vary depending on b of the silane compound, To 1:10.

The polycarbonate resin composition according to the present invention is characterized by containing (A) a polycarbonate resin, (B) the silane compound represented by the formula (1), and (C) an inorganic filler.

(A) Polycarbonate resin

The polycarbonate resin used in the present invention may be a conventional polycarbonate resin. For example, an aromatic polycarbonate resin prepared by reacting a diphenol (diol compound) with phosgene, halogen formate or carbonic acid diester can be used.

Specific examples of the diphenols include 4,4'-biphenol, 2,2-bis (4-hydroxyphenyl) propane, 2,4-bis (4-hydroxyphenyl) (3-chloro-4-hydroxyphenyl) propane, 2,2-bis (3,5-dichloro-4-hydroxyphenyl) Propane, and the like, but the present invention is not limited thereto.

The polycarbonate resin may be used in the form of a branched chain. For example, the polycarbonate resin may contain 0.05 to 2 mol% of a trifunctional or more polyfunctional compound, for example, trivalent or trivalent, Or a compound having a phenol group as described above.

The polycarbonate resin may be used in the form of a homopolycarbonate resin, a copolycarbonate resin or a blend thereof.

The polycarbonate resin may be partially or wholly substituted with an aromatic polyester-carbonate resin obtained by polymerization reaction in the presence of an ester precursor such as a bifunctional carboxylic acid.

The polycarbonate resin may have a weight average molecular weight (Mw) measured by gel permeation chromatography (GPC) of 10,000 to 200,000 g / mol, for example, 15,000 to 80,000 g / mol, but is not limited thereto.

(B) a silane-based compound

The silane compound represented by the formula (1) used in the present invention serves as a compatibilizing agent or a coupling agent in the polycarbonate resin composition, thereby enhancing the interfacial adhesion between the polycarbonate and the inorganic filler and improving the adhesion between the inorganic filler and the additive The impact resistance can be improved without decomposition of the resin (decrease in molecular weight). Furthermore, since the silane-based compound has an appropriate affinity with the polycarbonate resin, the silane-based compound tends to move toward the inorganic filler rather than being distributed independently to the polycarbonate matrix as compared with the silane-based compound containing the polycarbonate unit. May be more effective in improving the bonding strength between the resin and the inorganic filler.

In an embodiment, the content of the silane compound may be 0.5 to 20 parts by weight, for example, 2 to 10 parts by weight, based on 100 parts by weight of the polycarbonate resin. The polycarbonate resin composition can be prevented or reduced from decomposition of the polycarbonate resin by the inorganic filler, additives and the like within the above range, and a polycarbonate resin composition excellent in impact resistance can be obtained.

(C) Inorganic filler

Examples of the inorganic filler used in the present invention include, but are not limited to, silica, talc, glass fiber, mica, wollastonite, basalt fiber, whisker, and mixtures thereof. For example, talc, wollastonite, a mixture of glass fibers and the like can be used. The inorganic filler may partially or wholly condense with the silane compound to form a chemical bond.

In an embodiment, the average particle size of the inorganic filler may be, for example, 50 nm to 100 m, but is not limited thereto.

In an embodiment, the glass fiber may be a glass fiber reinforcing material in which a glass filament coated with a sizing agent such as epoxy, urethane, or silane is collected to form a fiber. The average particle size of the glass filaments may be from 5 to 20 占 퐉, and the glass fiber reinforcing agent formed therefrom may have an average particle size of 10 to 13 占 퐉, but is not limited thereto. The amount of the sizing agent may be 0.05 to 0.1 parts by weight based on 100 parts by weight of the glass filament, but is not limited thereto.

In an embodiment, the content of the inorganic filler may be 5 to 50 parts by weight, for example, 10 to 30 parts by weight, based on 100 parts by weight of the polycarbonate resin. Within the above range, a polycarbonate resin composition having excellent rigidity can be obtained without decreasing the molecular weight of the resin.

The weight ratio of the silane compound and the inorganic filler (silane compound: inorganic filler) may be 1: 2 to 30, for example, 1: 2 to 20. The impact resistance of the polycarbonate resin composition can be further improved in the above range.

The flame-retardant thermoplastic resin composition according to the present invention may further contain additives such as a flame retardant aid, a lubricant, a plasticizer, a heat stabilizer, an anti-drop agent, an antioxidant, a compatibilizer, a light stabilizer, a pigment and a dye. These may be used alone or in combination of two or more. For example, the additive may be included in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the base resin, but is not limited thereto.

In the polycarbonate resin composition of the present invention, the silane compound may be partially or wholly chemically bonded to the inorganic filler. For example, the polycarbonate resin composition may be in the form of a pellet obtained by melt-extruding at 200 to 280 DEG C, preferably 250 to 260 DEG C using a conventional twin-screw extruder by mixing the above components, , The silane group of the silane compound and the hydroxyl group of the inorganic filler may be formed on the surface of the inorganic filler by a covalent bond by condensation and subjected to a dehydration condensation reaction in the extrusion drying process to form a chemical bond.

The pellets can be made into various molded articles through various molding methods such as injection molding, extrusion molding, vacuum molding, casting molding and the like. Such molding methods are well known to those of ordinary skill in the art to which the present invention pertains.

In a specific example, the polycarbonate resin composition of the present invention may have a tensile strength, measured according to ASTM D638, of 600 to 1,500 kgf / cm ² , such as 640 to 1,000 kgf / cm ² , measured according to ASTM D790 A flexural strength may be 900 to 2,000 kgf / cm ² , for example 990 to 1,500 kgf / cm ² , and a flexural modulus may be 30,000 to 110,000 kgf / cm ² , for example 45,000 to 75,000 kgf / cm ² .

Further, the polycarbonate resin composition may have an Izod impact strength of 3 to 15 kgf · cm / cm, for example, 3.5 to 10 kgf · cm / cm 2 for a 1/8 "thick specimen measured according to ASTM D256 .

The polycarbonate resin composition is a method of adjusting the height of a weight having a predetermined weight and dropping it on a 1 mm thick specimen to visually confirm whether or not a specimen crack has occurred. By adjusting the height of the weight, (10 cm × 10 cm × 1 mm) FDI (falling darts) measured using a 2 kg weight dart according to the Dupont drop measurement method, impact) The impact strength (cracking energy value) may be 5 to 40 J, for example 5 to 20 J.

The polycarbonate resin composition may have a flow index (MI) measured according to ASTM D1238 of 10 to 80 g / 10 min, for example, 20 to 50 g / 10 min.

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. However, the following examples are provided to aid understanding of the present invention, and the scope of the present invention is not limited to the following examples. The contents not described here are sufficiently technically inferior to those skilled in the art, and a description thereof will be omitted.

Example

Production Example 1: Preparation of silane-based compound

5.0 g (0.002 mol) of a silane compound represented by the following formula (2a) (0.0045 mol) and a polyester compound (average value of n: about 10) represented by the following formula (3a) were dissolved in a tetrachloroethane (TCE) (Yield: 95%, weight average molecular weight (GPC measurement): 2,200 g / mol) was prepared by stirring the mixture at 80 DEG C for 5 hours to obtain a silane compound represented by the following formula (1a) (average value of n: about 10). The ¹ H-NMR spectrum of the silane-based compound represented by the formula (Ia) is shown in FIG.

[Formula 1a]

(2a)

[Chemical Formula 3]

In the above formulas (1a) and (3a), R ₃ is a benzoyl group (C ₆ H ₅ CO-).

Hereinafter, specifications of each component used in Examples and Comparative Examples are as follows.

(A) Polycarbonate resin

A flow index (measured at 300 캜 under the condition of 1.2 kg of MI, ISO 1133: 20 g / 10 min) was used as the bisphenol-A polycarbonate (manufactured by Cheil Industries,

(B) a silane-based compound

The silane compound of Preparation Example 1 was used.

(C) Inorganic filler

(C1) KC-3000 manufactured by KOCH Corporation was used as a talc filler.

(C2) NYGLOS 4W manufactured by NYCO Co., Ltd. was used as the wollastonite filler.

(D) Polybutadiene terephthalate (PBT) oligomer

The polyester compound represented by the above formula (3a) (average value of n: about 10) was used.

Examples 1 to 4 and Comparative Examples 1 to 3

The above components were added in the amounts shown in Tables 1 and 2, and then melted, kneaded and extruded at 200 to 280 ° C to prepare pellets. The pellets were dried at 80 DEG C for 12 hours and then passed through a 6 oz. Extruder (molding temperature: 290 DEG C, mold temperature: 60 DEG C). The extruder was extruded using a twin screw extruder having an L / D of 36 and a diameter of 45 mm. ) To prepare specimens. The properties of the prepared specimens were evaluated by the following methods, and the results are shown in Tables 1 and 2 below.

How to measure property

(1) Izod Impact Strength (Unit: kgf · cm / cm): An Izod specimen having a thickness of 1/8 "according to ASTM D256 was evaluated by making a notch.

(2) FDI (Falling Dart Impact) Impact Strength (Surface Impact Strength, Crack Initiation Energy, Unit: J): Based on the Dupont drop measurement, a 0.5 to 2 kg dart (10 cm × 10 cm × 1 mm) was measured and converted into an energy value.

(3) Tensile strength (unit: kgf / cm ² ): Measured under the condition of 5 mm / min according to ASTM D638.

(4) Flexural Modulus and Flexural Strength (Unit: kgf / cm ² ): Flexural modulus and flexural strength were measured according to ASTM D790 at a rate of 2.8 mm / min.

(5) Melt flow index (MI, unit: g / 10 min): Measured under the conditions of 300 ° C and 5 kg according to the evaluation method specified in ASTM D1238.

(6) Polycarbonate of extruded pellets Weight average molecular weight (unit: g / mol): 0.01 to 0.015 g of extruded pellets were dissolved in 2 mL of methylenechloride, diluted in 10 mL of tetrahydrofuran (THF) The mixture was filtered using a syringe filter and then measured using a Waters GPC system (515 HPLC pump, 2414 RI detector). Shodex LF-804 was used as a column, and Shodex polystyrene (PS: 8 kinds of weight average molecular weight (Mw) 1,000-2,000,000) was used as a standard.

Example One 2 3 4 (A) Polycarbonate 100 100 100 100 (B) a silane-based compound One 2 4 3 (C) Inorganic filler (C1) 25 25 25 14 (C2) - - - 28 Izod impact strength 4.0 4.5 4.6 5.0 FDI impact strength 12 13 13 5 The tensile strength 730 730 735 640 Flexural strength 1170 1190 1170 990 Flexural modulus 47600 48700 49400 57300 Flow index 42 32 30 44 Compressed Pellet Molecular Weight (Mw) 24K 24K 23K 23K

Content Unit: parts by weight

Comparative Example One 2 3 (A) Polycarbonate 100 100 100 (D) PBT oligomer - 2 - (C) Inorganic filler (C1) 25 25 14 (C2) - - 28 Izod impact strength 3.0 3.2 2.3 FDI impact strength Less than 1 4 Less than 1 The tensile strength 730 720 570 Flexural strength 1160 1150 890 Flexural modulus 48700 47900 58800 Flow index 80 64 113 Compressed Pellet Molecular Weight (Mw) 21K 21K 18K

Content Unit: parts by weight

From the above results, it can be seen that the polycarbonate resin composition to which the silane-based compound of the present invention is applied has little weight-average molecular weight reduction of the polycarbonate and excellent impact resistance.

On the other hand, in the case of the comparative example using the PBT oligomer instead of the silane compound, it is found that there is a limit to the improvement of the stiffness and the impact resistance by the inorganic filler.

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 (10)

A silane-based compound represented by the following formula (1)
[Chemical Formula 1]

Wherein R ₁ is a hydrogen atom or a substituted or unsubstituted hydrocarbon group having 1 to 5 carbon atoms, R ₂ is a substituted or unsubstituted alkylene group having 2 to 10 carbon atoms, R ₃ is a hydrogen atom, A substituted or unsubstituted arylene group having 2 to 20 carbon atoms, Ar is a substituted or unsubstituted arylene group having 6 to 12 carbon atoms, a and b each independently represent a substituted or unsubstituted C1 to C20 alkyl group, A + b is 4, m is an integer of 0 to 5, and the average value of n is 5 to 50. [
The silane-based compound according to claim 1, wherein the silane-based compound has a weight average molecular weight of 1,000 to 17,000 g / mol.
Reacting a silane compound represented by the following formula (2) and a polyester compound represented by the following formula (3): < EMI ID =
[Chemical Formula 1]

Wherein R ₁ is a hydrogen atom or a substituted or unsubstituted hydrocarbon group having 1 to 5 carbon atoms, R ₂ is a substituted or unsubstituted alkylene group having 2 to 10 carbon atoms, R ₃ is a hydrogen atom, A substituted or unsubstituted arylene group having 2 to 20 carbon atoms, Ar is a substituted or unsubstituted arylene group having 6 to 12 carbon atoms, a and b each independently represent a substituted or unsubstituted C1 to C20 alkyl group, A + b is 4, m is an integer of 0 to 5, and the average value of n is 5 to 50;
(2)

(3)

Wherein R ₁ , R ₂ , R ₃ , Ar, a, b, m and n are as defined in Formula 1 and X is a halogen atom, a hydroxyl group, a substituted or unsubstituted C1- Or a substituted or unsubstituted aryloxy group having 6 to 20 carbon atoms.
4. The method of claim 3, wherein the reaction is carried out in an organic solvent at 30 to 110 < 0 > C.
Polycarbonate resin;
A silane-based compound represented by the following formula (1); And
A polycarbonate resin composition comprising an inorganic filler:
[Chemical Formula 1]

Wherein R ₁ is a hydrogen atom or a substituted or unsubstituted hydrocarbon group having 1 to 5 carbon atoms, R ₂ is a substituted or unsubstituted alkylene group having 2 to 10 carbon atoms, R ₃ is a hydrogen atom, A substituted or unsubstituted arylene group having 2 to 20 carbon atoms, Ar is a substituted or unsubstituted arylene group having 6 to 12 carbon atoms, a and b each independently represent a substituted or unsubstituted C1 to C20 alkyl group, A + b is 4, m is an integer of 0 to 5, and the average value of n is 5 to 50. [
6. The polycarbonate resin composition according to claim 5, wherein the content of the silane compound is 0.5 to 20 parts by weight based on 100 parts by weight of the polycarbonate resin, and the content of the inorganic filler is 5 to 50 parts by weight.
The polycarbonate resin composition according to claim 5, wherein the weight ratio of the silane compound to the inorganic filler is 1: 2 to 30.
The polycarbonate resin composition according to claim 5, wherein the inorganic filler comprises at least one of silica, talc, glass fiber, mica, wollastonite, basalt fiber and whisker.
The polycarbonate resin composition according to claim 5, wherein the silane-based compound is partially or wholly present in a state of being chemically bonded to the inorganic filler.
The polycarbonate resin composition according to claim 5, wherein the polycarbonate resin composition has a tensile strength of 600 to 1,500 kgf / cm ^{2 as} measured according to ASTM D638, a flexural strength of 900 to 2,000 kgf / cm ^{2 as} measured according to ASTM D790, A flexural modulus of 30,000 to 110,000 kgf / cm ² , an Izod impact strength of 3 to 15 kgf · cm / cm ² in a 1/8 "thick specimen measured according to ASTM D256, and a 1 mm A falling dart impact (FDI) impact strength of the thickness specimen is 5 to 40 J, and a flow index (MI) measured according to ASTM D1238 is 10 to 80 g / 10 min.

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