KR20190078826A - Polycarbonate resin composition, method for preparing the resin composition and molded article comprising the same - Google Patents

Abstract

The present invention relates to a polycarbonate resin composition, a producing method thereof, and a molded product including the same and, more specifically, to a polycarbonate resin composition which includes (A) 40 to 85 wt% of a polycarbonate resin, (B) 1 to 10 wt% of styrenic copolymer, (C) 10 to 40 wt% of an inorganic filler including a plate-shaped inorganic filler and a needle-shaped inorganic filler coated with a polyolefin resin on the surface, and (D) 0.1 to 20 wt% of phosphorus flame retardant, wherein tensile elongation measured by an ASTM D638 method is 10% or more. The polycarbonate resin composition provided by the present invention has excellent mechanical properties such as tensile elongation and impact strength and has excellent appearance by having high compatibility and inorganic fillers.

Description

TECHNICAL FIELD [0001] The present invention relates to a polycarbonate resin composition, a method for producing the same, and a molded article comprising the same. [0002]

The present invention relates to a polycarbonate resin composition, a process for producing the polycarbonate resin composition, and a molded article including the polycarbonate resin composition. More particularly, the present invention relates to a polycarbonate resin composition having excellent compatibility with a polycarbonate resin and an inorganic filler and having excellent mechanical properties such as tensile elongation and impact strength, To a process for producing the polycarbonate resin composition, and to a molded article comprising the polycarbonate resin composition.

BACKGROUND ART Polycarbonate resins are well known as amorphous thermoplastic resins having high impact resistance at room temperature, excellent mechanical properties such as impact strength, excellent thermal properties such as flame retardance and heat resistance, and high dimensional stability. It is widely used for various application fields such as housing material of electric and electronic products such as office automation equipment and IT equipment.

Further, studies have been made to improve the physical properties of the polycarbonate resin by reinforcing with various fillers such as an inorganic filler, carbon fiber, and glass fiber. In addition to polycarbonate resin alone, acrylonitrile-butadiene- To improve the processability and moldability of the resin composition.

However, when the inorganic filler is blended in the polycarbonate resin, it is difficult to increase the compatibility between the polycarbonate resin and the inorganic filler, so that the strength of the polycarbonate resin is lowered, and the appearance property such as the inorganic filler protrudes on the surface of the molded article may occur. There is a problem that the mechanical properties such as impact resistance of the composition may be deteriorated.

Therefore, there is a need to develop a polycarbonate resin composition having excellent appearance characteristics, mechanical properties, and thermal stability.

Korean Patent No. 10-0890335

In order to solve the problems of the prior art as described above, it is an object of the present invention to provide a polycarbonate resin composition which is excellent in mechanical properties such as tensile elongation and impact strength by increasing compatibility between a polycarbonate resin and an inorganic filler, .

It is another object of the present invention to provide a method for producing the polycarbonate resin composition and a molded article containing the same.

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

In order to achieve the above object, the present invention provides a thermoplastic resin composition comprising (A) 40 to 85% by weight of a polycarbonate resin; (B) 1 to 10% by weight of a styrenic copolymer; (C) 10 to 40% by weight of an inorganic filler comprising an acicular-type inorganic filler surface-coated with a polyolefin-based resin and a plate-like inorganic filler; And (D) 0.1 to 20% by weight of a phosphorus flame retardant, wherein a tensile elongation as measured according to the ASTM D638 method is 10% or more, and a molded article comprising the polycarbonate resin composition.

The present invention also provides a method for producing a polycarbonate resin composition, comprising: (A) 40 to 85% by weight of a polycarbonate resin; (B) 1 to 10% by weight of a styrenic copolymer; (C) 10 to 40% by weight of an inorganic filler comprising an acicular-type inorganic filler surface-coated with a polyolefin-based resin and a plate-like inorganic filler; And (D) 0.1 to 20% by weight of a phosphorus-based flame retardant by melt-kneading with a twin-screw extruder and extruding the polycarbonate resin composition, wherein the polycarbonate resin composition has a tensile elongation as measured according to the ASTM D638 method of 10% A method for producing a carbonate resin composition is provided.

According to the present invention, it is possible to provide a polycarbonate resin composition having high compatibility with an inorganic filler and excellent mechanical properties such as tensile elongation and impact strength, and particularly excellent in appearance, a method for producing the same, and a molded article comprising the same.

Fig. 1 is a photograph of the appearance of the article produced in Comparative Example 5. Fig.
Fig. 2 is a photograph of the appearance of the article produced in Example 3. Fig.
3 is a view showing a structure of an extruder according to an embodiment.

Hereinafter, the polycarbonate resin composition of the present invention, a method for producing the same, and a molded article comprising the polycarbonate resin composition will be described in detail.

As a result of efforts to develop a polycarbonate material having excellent mechanical properties and excellent appearance properties, the present inventors have found that when the mixing ratio of the needle-shaped inorganic filler and the plate-shaped inorganic filler is controlled within a specific range, the physical properties of the polycarbonate resin are improved, It was confirmed that when the coated needle-shaped inorganic filler is used, compatibility with the polycarbonate resin can be enhanced and the strength is improved. In addition, it was confirmed that when the inorganic filler is put into a specific position at the time of extrusion, the appearance of the inorganic filler does not protrude to the surface of the article, thereby providing a beautiful appearance. Based on these results, the present inventors have been intensively studied to complete the present invention.

The polycarbonate resin composition of the present invention comprises (A) 40 to 85% by weight of a polycarbonate resin; (B) 1 to 10% by weight of a styrenic copolymer; (C) 10 to 40% by weight of an inorganic filler comprising an acicular-type inorganic filler surface-coated with a polyolefin-based resin and a plate-like inorganic filler; And (D) 0.1 to 20% by weight of a phosphorus-based flame retardant. In this case, mechanical properties such as impact resistance, flexural elasticity and tensile elongation are excellent, and particularly excellent appearance characteristics are provided.

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

(A) Polycarbonate resin

The polycarbonate resin (A) may be contained in an amount of 40 to 70% by weight or 45 to 65% by weight, preferably 50 to 60% by weight, based on the polycarbonate resin composition. Within this range, And an excellent balance of physical properties.

The kind of the (A) polycarbonate resin is not particularly limited, but may be, for example, a resin polymerized including a bisphenol-based monomer and a carbonate precursor.

Examples of the non-sprinol-based monomer include bis (4-hydroxyphenyl) methane, bis (4-hydroxyphenyl) ether, bis (4-hydroxyphenyl) sulfone, bis (4-hydroxyphenyl) sulfone, bis (4-hydroxyphenyl) ketone, 1,1-bis (4-hydroxyphenyl) ethane, 2,2-bis (4-hydroxyphenyl) propane (bisphenol A; BPA), 2,2-bis (4-hydroxyphenyl) butane, 1,1-bis (4-hydroxyphenyl) cyclohexane (bisphenol Z; BPZ) Propane, 2,2-bis (4-hydroxy-3-bromophenyl) propane, 2 (4-hydroxy-3-methylphenyl) propane, 2,2-bis (4-hydroxy-3-chlorophenyl) ) Propane, 1,1-bis (4-hydroxyphenyl) -1-phenylethane, bis (4-hydroxyphenyl) diphenylmethane and?,? Polydimethylsiloxane And an acid.

The carbonate precursor may be at least one selected from the group consisting of dimethyl carbonate, diethyl carbonate, dibutyl carbonate, dicyclohexyl carbonate, diphenyl carbonate, ditolyl carbonate, bis (chlorophenyl) carbonate, m-cresyl carbonate, dinaphthyl carbonate, bis Diphenyl carbonate), carbonyl chloride (phosgene), triphosgene, diphosgene, carbonyl bromide, and bishaloformate.

The polycarbonate resin (A) is, for example, a linear polycarbonate resin, and in this case, the flowability is improved and the appearance characteristics are excellent.

A specific example of the linear polycarbonate resin may be a bisphenol-A polycarbonate resin, but is not limited thereto.

The polycarbonate resin (A) may, for example, have a weight average molecular weight of 10,000 to 60,000 g / mol or 15,000 to 40,000 g / mol, preferably 20,000 to 35,000 g / mol, It is possible to obtain an excellent appearance with excellent physical properties.

In the present description, the weight average molecular weight can be measured relative to a standard polystyrene sample through gel chromatography (GPC).

The polycarbonate resin (A) has a melt index (300 ° C, 1.2 kg) measured according to ASTM D1238 of 5 to 50 g / 10 min, or 5 to 40 g / 10 min, preferably 10 to 25 g / Within this range, excellent mechanical properties such as impact strength and excellent appearance characteristics are obtained.

The method for producing the polycarbonate resin (A) is not particularly limited as long as it is a production method conventionally applied in this technical field, and commercially available products are also available.

(B) a styrenic copolymer

The styrene-based copolymer (B) may be contained in an amount of 1 to 10% by weight, or 1 to 7% by weight, and preferably 1 to 5% by weight, based on the polycarbonate resin composition. The balance between physical properties and physical properties is excellent.

The styrenic copolymer (B) may be, for example, a vinyl cyan compound-conjugated diene compound-aromatic vinyl compound copolymer, a methacrylate compound-conjugated diene compound-aromatic vinyl compound copolymer, or a mixture thereof It has an effect of providing particularly excellent appearance characteristics with excellent mechanical properties such as impact resistance, flexural modulus and tensile elongation.

The vinyl cyan compound-conjugated diene compound-aromatic vinyl compound copolymer may be, for example, a graft copolymer in which an aromatic vinyl compound and a vinyl cyan compound are graft-polymerized on a rubbery polymer polymerized including a conjugated diene compound.

The vinyl cyan compound-conjugated diene compound-aromatic vinyl compound copolymer includes, for example, 5 to 60% by weight of a conjugated diene rubber polymer, 30 to 90% by weight of an aromatic vinyl compound, and 1 to 100% by weight of a vinyl cyan compound To 30% by weight of a conjugated diene rubber polymer, 5 to 50% by weight of a conjugated diene rubber polymer, 35 to 85% by weight of an aromatic vinyl compound and 5 to 27% by weight of a vinyl cyan compound. Within this range, impact strength, Mechanical strength and balance of physical properties are excellent.

The graft polymerization may be carried out by emulsion polymerization or suspension, and preferably by emulsion polymerization. In this case, there is an effect of excellent impact strength and physical property balance.

Examples of the conjugated diene compound include compounds derived from the group consisting of 1,3-butadiene, 2,3-dimethyl-1,3-butadiene, 2-ethyl-1,3-butadiene, 1,3-pentadiene, isoprene and chloroprene And may be at least one selected from the group consisting of 1,3-butadiene and 1,3-butadiene. In this case, the balance between mechanical properties and physical properties is excellent.

The aromatic vinyl compound of the present invention may be at least one selected from the group consisting of styrene,? -Methylstyrene, p-methylstyrene, o-ethylstyrene, p-ethylstyrene and vinyltoluene, May be at least one selected from the group consisting of acrylonitrile, methacrylonitrile, and ethacrylonitrile.

The vinyl cyan compound-conjugated diene compound-aromatic vinyl compound copolymer may have a weight average molecular weight of 100,000 to 200,000 g / mol, or 110,000 to 185,000 g / mol, and preferably 110,000 to 180,000 g / mol, There is an effect of excellent balance of mechanical properties and physical properties such as tensile elongation within the range.

The vinyl cyan compound-conjugated diene compound-aromatic vinyl compound copolymer can be alloyed with the polycarbonate resin, for example, and in this case, it has an excellent balance of mechanical properties and physical properties.

The methacrylate compound-conjugated diene compound-aromatic vinyl compound copolymer may be, for example, a copolymer of a core-shell structure in which a methacrylate compound is graft copolymerized with a conjugated diene rubber, And an excellent balance of physical properties.

The conjugated diene rubber may be, for example, butadiene rubber or styrene-butadiene rubber. Examples of the methacrylate-based compound include alkyl methacrylates in which the alkyl group has 1 to 10 carbon atoms or aryl groups having 6 to 10 carbon atoms in the aryl group Methacrylate, and specific examples thereof include at least one selected from the group consisting of methyl methacrylate, butyl methacrylate, benzyl methacrylate, and the like.

The methacrylate compound-conjugated diene compound-aromatic vinyl compound copolymer is, for example, 20 to 80 parts by weight or 30 to 70 parts by weight, preferably 30 to 70 parts by weight, based on 100 parts by weight of the conjugated diene rubber 30 to 60 parts by weight, and the impact resistance is excellent within this range.

Examples of the methacrylate compound-conjugated diene compound-aromatic vinyl compound copolymer include 1 to 40 parts by weight, 20 to 40 parts by weight, and preferably 10 to 30 parts by weight of an aromatic vinyl compound per 100 parts by weight of the conjugated diene rubber In this case, there is an effect of excellent balance of physical properties and excellent impact resistance.

The method for producing the methacrylate compound-conjugated diene compound-aromatic vinyl compound copolymer is not particularly limited as long as it is a commercially available method in the art, and commercially available products may be used.

(C) Weapons Filler

The inorganic filler (C) may be contained in an amount of 10 to 40% by weight, or 15 to 35% by weight, and preferably 20 to 30% by weight based on the polycarbonate resin composition. Within this range, An excellent balance of physical properties is obtained.

The inorganic filler (C) of the present invention may be prepared by mixing two or more kinds of inorganic fillers having different shapes to improve physical properties and coating the surface of one or more kinds of inorganic fillers to improve compatibility with the polycarbonate resin, And a weld line and a whiteness phenomenon, which are caused by protruding an inorganic filler on the surface during injection, are markedly reduced, thereby significantly improving appearance characteristics.

The inorganic filler (C) may include, for example, an acicular-type inorganic filler surface-coated with a polyolefin-based resin and a plate-like inorganic filler.

For example, the needle-shaped inorganic filler may be used in an amount of 0.1 to 5 parts by weight, or 0.1 to 3 parts by weight, preferably 0.5 to 2 parts by weight, based on 100 parts by weight of the needle-shaped inorganic filler excluding the surface-coated polyolefin resin, And the compatibility with the polycarbonate resin is increased within this range, so that the mechanical properties such as impact strength, flexural elasticity and tensile elongation are excellent, and particularly excellent appearance characteristics are obtained.

Examples of the polyolefin resin include polyolefin rubber, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), high density polyethylene (HDPE), ethylene vinyl acetate (EVA), polypropylene (PP), and butadiene rubber (BR) , And considering the compatibility with the polycarbonate resin, the use of butadiene rubber is preferable because it can obtain an excellent effect of mechanical properties such as impact strength and appearance characteristics.

The acicular-type inorganic filler may have an aspect ratio of 8 or more, or 8 to 15, and preferably 8 to 12, for example, and has an excellent appearance property within this range.

In the present invention, the aspect ratio can be calculated from the following expression.

* Aspect ratio = (average) length (long diameter) / (average) diameter

The needle-like inorganic filler may have a length of 15 to 300 mu m or 20 to 250 mu m, preferably 30 to 200 mu m, and may have a diameter of 1 to 50 mu m or 1 to 40 mu m, preferably 1 to 30 mu m, Mu m, and it has an excellent appearance property within this range. The length of the acicular inorganic filler may be an average length of the acicular inorganic filler contained in the polycarbonate resin composition, and the diameter of the acicular inorganic filler may be an average length of the acicular inorganic filler contained in the polycarbonate resin composition Diameter.

The acicular-type inorganic filler can be, for example, a pH of 9 to 10, or 9.2 to 10, preferably 9.7 to 10, and has an excellent appearance property within this range.

The pH can be measured with a pH meter with stirring after 10 wt% slurry (20 ± 1 g of inorganic filler + 18 ± 2 ml of deionized water) is completely dissolved.

The acicular-type inorganic filler may be, for example, a calcium silicate-based acicular filler. In this case, the acicular-type inorganic filler has excellent mechanical properties and appearance characteristics.

The average length and average diameter of the acicular-type inorganic filler can be measured by SEM (scanning electron microscope) or TEM (transmission electron microscope).

The plate-like inorganic filler has an average thickness of 30 to 700 nm, or 100 to 600 nm, preferably 200 to 500 nm, and an average length of 0.1 to 10 탆, or 1 to 8 탆, 7 mu m. Within this range, there is an effect of excellent mechanical properties and appearance characteristics.

The plate-like inorganic filler may be, for example, a magnesium silicate-based plate-like filler, Phyllosilicates, or a mixture thereof. In this case, mechanical strength and appearance characteristics can be improved at the same time.

The average thickness and average length of the sheet-like inorganic filler can be measured by SEM (scanning electron microscope) or TEM (transmission electron microscope).

In the present invention, the needle-like and plate-like shapes of the inorganic filler are not particularly limited when they are needle-shaped or sheet-like, which are generally accepted in the technical field of the present invention, and their distinction is obvious to those skilled in the art.

The inorganic filler (C) has a weight ratio of the needle-like inorganic filler to the plate-like inorganic filler in the range of 9: 1 to 1: 1, or 6: 1 to 1: 1, preferably 4: 1 to 2: Within this range, there is an effect that the mechanical properties such as tensile elongation, flexural elasticity, impact strength and the like are excellent and appearance characteristics are remarkably improved.

(D) Take over Flame retardant

The phosphorus flame retardant (D) means a conventional flame retardant containing phosphorus (P), and is not particularly limited as long as it can be used in a polycarbonate resin composition. However, it may be an organic phosphate-based flame retardant, have.

The organic phosphate-based flame retardant is, for example, selected from among triphenylphosphate, tricresyl phosphate, triaisyl phosphate, cresyldiphenyl phosphate, octyldiphenyl phosphate, bisphenol a diphosphate and aromatic diphosphate having the structure It may be more than one kind.

[Chemical Formula 1]

In the formula 1, for example, Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ may be the same or different and are independently selected from a phenyl group or an aryl group having 1 to 3 substituted alkyl groups having 1 to 4 carbon atoms And R may be phenyl or bisphenol-A, and n is an integer from 1 to 5.

As a specific example, Bisphenol A bis (diphenylphosphate) can be used as the phosphorus flame retardant (D). In this case, the flame retardancy is excellent, and mechanical properties and appearance characteristics are improved.

The phosphorus flame retardant (D) may be contained in an amount of 0.1 to 20% by weight, 5 to 20% by weight, or 5 to 15% by weight based on the polycarbonate resin composition. In this range, Has an excellent effect.

(E) Other additives

The polycarbonate resin composition may contain, for example, a heat stabilizer, a UV stabilizer, a releasing agent, a lubricant, a dispersant, an antioxidant, an antistatic agent, an antistatic agent, a colorant, a plasticizer, a pigment and a dye And at least one additive selected from the group consisting of

The additive may be, for example, 0.1 to 10% by weight, 0.1 to 5% by weight, or 1 to 5% by weight based on 100% by weight of the polycarbonate resin composition. Within this range, It has an effect of expressing the desired physical properties.

For example, the polycarbonate resin composition may have a flexural modulus of 52,000 to 60,000 kg / cm ² , 55,000 to 59,000 kg / cm ² , or 57,000 to 59,000 kg / cm ^{2 as} measured according to the ASTM D790 method, The balance of physical properties is excellent.

The polycarbonate resin composition may have an impact strength of 4 to 9 kgf · cm / cm, 5 to 8 kgf · cm / cm, or 5 to 7 kgf · cm / cm measured according to the ASTM D256 method, Within this range, excellent mechanical properties such as impact strength and excellent balance of physical properties are obtained.

For example, the polycarbonate resin composition may have a tensile elongation of 10% or more, 10% to 13%, or 11% to 13% as measured according to the ASTM D638 method, and has an excellent balance of physical properties within this range.

The production method of the polycarbonate resin composition of the present invention is, for example, (A) 40 to 85% by weight of a polycarbonate resin; (B) 1 to 10% by weight of a styrenic copolymer; (C) 10 to 40% by weight of an inorganic filler comprising an acicular-type inorganic filler surface-coated with a polyolefin-based resin and a plate-like inorganic filler; And (D) 0.1 to 20% by weight of a phosphorus-based flame retardant by melt-kneading with a twin-screw extruder and extruding the extruded polycarbonate resin composition, wherein the extruded polycarbonate resin composition has a tensile elongation of 10% or more as measured according to ASTM D638 .

For example, the biaxial extruder may have a main hopper of 0 to 10% from the upper end (0%) of the extruder, a first side feeder of more than 10% 50% or less, and optionally the second side feeder may be located from greater than 50% to 100%.

For example, the melt-kneading can be melt-extruded in a twin-screw extruder at 200 to 300 ° C, or 210 to 295 ° C, preferably 220 to 290 ° C. Within this range, the physical and chemical affinity between constituents is high, The balance has an excellent effect.

For example, in the main hopper of the twin-screw extruder, all of the polycarbonate resin, the styrenic copolymer, the phosphorus flame retardant and the plate-like inorganic filler, or all of the polycarbonate resin, styrenic copolymer, phosphorus flame retardant and plate- And the remaining needle-like inorganic filler can be introduced into the first side feeder. In this case, the amount of each inorganic filler can be controlled to be constant, and the inorganic filler is pulverized by the force received in the extruder .

As a specific example, the acicular-type inorganic filler is added to the main hopper in an amount of 0 to 50% by weight, or 30 to 50% by weight of the acicular inorganic filler, and the remaining 50 to 100% by weight or 50 to 70% Side feeder. In this case, the weld line and the Baek-Myeong phase, which are caused by the protrusion of the inorganic filler on the surface when the product is injected, are remarkably reduced to obtain excellent appearance characteristics.

Specifically, 0 to 15% by weight, or 7 to 13% by weight, based on 100% by weight of the polycarbonate resin composition, of all of the plate-shaped inorganic fillers or all of the plate-shaped inorganic fillers and the needle-shaped inorganic fillers are added to the main hopper of the twin- , And 1 to 20% by weight or 7 to 13% by weight of an acicular-type inorganic filler may be added to the first side feeder of the twin-screw extruder. In this case, the weld line and the whiteness phase are remarkably reduced to obtain excellent appearance characteristics There is an effect.

The molded article according to the present invention is characterized by including the polycarbonate resin composition.

The molded article may be, for example, an injection molded article, and may be a housing such as a notebook computer, a TV, a computer, a monitor, a copier, a scanner, or a telephone.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention. Such variations and modifications are intended to be within the scope of the appended claims.

[Example]

Example  1 to 3 and Comparative Example  1 to 6

(A), polycarbonate resin (B), styrenic copolymer (D) and phosphorus flame retardant were mixed in the contents (% by weight) shown in the following Table 1 using a super mixer, (C) the inorganic filler is introduced into the main hopper of a twin-screw extruder provided with a first side feeder 2 and a second side feeder 3, A hopper, a first side feeder and / or a second side feeder, melt-kneaded and extruded at a temperature of 220 to 290 ° C to prepare a resin composition in the form of a pellet.

The prepared pelletized resin composition was dried at 80 DEG C for 4 hours or more and injection molded to prepare a specimen. The specimen was left at room temperature (20 to 26 DEG C) for 48 hours or more, and the physical properties thereof were measured.

The respective components in Table 1 are as follows.

(A) Polycarbonate resin (PC): A linear polycarbonate resin having a melt index of 10 to 25 g / 10 min (300 DEG C, 1.2 kg)

* (B) Styrenic copolymer (ABS): aromatic vinyl compound-conjugated diene compound-vinyl cyan compound copolymer

* (C) Inorganic filler:

- (MF 1): Calcium silicate-based needle-shaped filler coated with an olefin-based material

- (MF 2): Magnesium silicate based plate type filler

(D) Phosphorous flame retardant: bisphenol A bis (diphenylphosphate)

* (E) MBS rubber: methyl methacrylate-butadiene-styrene resin

* (F) Other additives: Heat stabilizer lubricants and pigments, etc.

[Test Example]

The physical properties of the polycarbonate resin composition specimens obtained in Examples 1 to 3 and Comparative Examples 1 to 6 were measured by the following methods, and the results are shown in Table 1 below.

How to measure

* Impact strength (Notched Izod, kgf cm m / cm): Measured according to standard measurement ASTM D256 using 1/8 "specimen.

Flexural modulus (kgf / cm ² ): Measured according to standard measurement ASTM D790 at a rate of 1.3 mm / min using a 1/8 "specimen.

Tensile elongation (%): Measured according to standard measurement ASTM D638 using 1/8 "specimen.

* Appearance evaluation: Check the visualization of the flow mark (gate mark) and the degree of white smoke through injection on the product injection mold. If the appearance is good, "⊙", if the appearance is good, "O" X ".

division Example Comparative Example One 2 3 One 2 3 4 5 6 PC 58.3 58.3 58.3 58.3 58.3 58.3 58.3 58.3 50.1 ABS 3.5 3.5 - 3.5 3.5 3.5 3.5 3.5 11.7 BDP 11.7 11.7 11.7 11.7 11.7 11.7 11.7 11.7 11.7 MBS - - 3.5 - - - - - - 1 ¹⁾ MF 1) - 10 10 - - - - - 10 MF 2) 7 5 5 - - - 20 5 5 2 ²⁾ MF 1) 18 10 10 25 - - 5 20 10 MF 2) - - - - - - - - - 3 ³⁾ MF 1) - - - - 25 25 - - - MF 2) - - - - - - - - - additive 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 * Properties Tensile elongation
(%) 10.0 12.0 11.0 5.0 11.0 6.0 8.0 9.5 12.0 Flexural modulus
(kgf / cm ² ) 56000 58000 54000 47000 57000 46000 43000 55000 53000 Impact strength
(kgf · cm / cm) 4.5 5.5 4.5 4.0 5.0 5.0 4.5 6.0 5.5 Appearance evaluation O ⊙ O X X X X X X

1): feed into main hopper of twin-screw extruder

2): feed into 1st side feeder of twin-screw extruder

3): feed into 2nd side feeder of twin-screw extruder

As shown in Table 1, Examples 1 to 3 prepared according to the present invention had excellent tensile elongation, flexural modulus and impact strength, and excellent appearance.

Particularly, in Example 3 in which a part of the needle-shaped inorganic filler was introduced into the side feeder, it was confirmed that the mechanical properties such as tensile elongation and flexural modulus were excellent and the appearance characteristics were remarkably improved.

In addition, in Comparative Examples 1 to 3 using an acicular-type inorganic filler or a plate-like inorganic filler alone, it was confirmed that the external appearance properties were remarkably deteriorated as compared with the examples.

In addition, in Comparative Example 6 in which the styrene type resin was used in an amount exceeding 10% by weight, it was confirmed that the flexural modulus and appearance characteristics were inferior to those in Examples.

Claims (17)

(A) 40 to 85% by weight of a polycarbonate resin; (B) 1 to 10% by weight of a styrenic copolymer; (C) 10 to 40% by weight of an inorganic filler comprising an acicular-type inorganic filler surface-coated with a polyolefin-based resin and a plate-like inorganic filler; And (D) 0.1 to 20% by weight of a phosphorus flame retardant,
A polycarbonate resin composition characterized by having a tensile elongation of 10% or more as measured according to the ASTM D638 method.
The method according to claim 1,
Wherein the polycarbonate resin (A) is a linear polycarbonate resin.
The method according to claim 1,
Wherein the polycarbonate resin (A) has a melt index (300 DEG C, 1.2 kg) of 5 to 50 g / 10 min.
The method according to claim 1,
Wherein the styrene-based copolymer (B) is at least one selected from the group consisting of a vinyl cyan compound-conjugated diene compound-aromatic vinyl compound copolymer, a methacrylate compound-conjugated diene compound-aromatic vinyl compound copolymer, Composition.
5. The method of claim 4,
Wherein the vinyl cyan compound-conjugated diene compound-aromatic vinyl compound copolymer has a weight average molecular weight of 100,000 to 200,000 g / mol.
The method according to claim 1,
Wherein the weight ratio of the acicular-type inorganic filler to the sheet-like inorganic filler is from 9: 1 to 1: 1. The polycarbonate resin composition of (C)
The method according to claim 1,
Wherein the needle-shaped inorganic filler is surface-coated with 0.1 to 5 parts by weight of the polyolefin-based resin based on 100 parts by weight of the needle-shaped inorganic filler excluding the weight of the surface-coated polyolefin resin.
The method according to claim 1,
Wherein the acicular-type inorganic filler is a calcium silicate-based acicular filler.
The method according to claim 1,
Wherein the plate-like inorganic filler is a magnesium silicate-based plate-like filler.
The method according to claim 1,
Wherein the phosphorus flame retardant (D) is an organic phosphate-based flame retardant.
The method according to claim 1,
Wherein the polycarbonate resin composition comprises at least one additive selected from the group consisting of a heat stabilizer, a UV stabilizer, a releasing agent, a lubricant, a dispersant, an antioxidant, an antistatic agent, an antistatic agent, a colorant, a plasticizer, Polycarbonate resin composition.
The method according to claim 1,
Wherein the polycarbonate resin composition has an impact strength measured according to ASTM D256 of 4.5 kgf · cm / cm or more.
In the method for producing a polycarbonate resin composition,
(A) 40 to 85% by weight of a polycarbonate resin; (B) 1 to 10% by weight of a styrenic copolymer; (C) 10 to 40% by weight of an inorganic filler comprising an acicular-type inorganic filler surface-coated with a polyolefin-based resin and a plate-like inorganic filler; And (D) 0.1 to 20% by weight of a phosphorus-based flame retardant is melt-kneaded by a twin-screw extruder and then extruded,
Wherein the polycarbonate resin composition has a tensile elongation of 10% or more as measured according to the ASTM D638 method.
14. The method of claim 13,
Wherein all of the sheet-like inorganic fillers or part of the sheet-like inorganic fillers and part of the needle-shaped inorganic fillers are fed into the main hopper of the twin-screw extruder, and the needle-shaped inorganic fillers are fed into the side feeders.
14. The method of claim 13,
Wherein 50 to 100% by weight of the acicular-type inorganic filler is fed into the first side feeder.
14. The method of claim 13,
Wherein the melt-kneading is performed at 220 to 290 占 폚 with a twin-screw extruder.
A molded article comprising the polycarbonate resin composition according to any one of claims 1 to 12.

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