KR19990038454A - Polycarbonate resin composition - Google Patents

Abstract

The present invention relates to a polycarbonate resin composition excellent in chemical resistance and fluidity, low in thickness dependence of impact strength, and in which stiffness and impact strength are harmonized.

In the polycarbonate resin composition according to the present invention, in order to improve fluidity and chemical resistance and lower the thickness dependency of impact strength, (B) polyolefin resin is blended with (A) polycarbonate resin, and compatibility therebetween. In order to increase the (C) the reactive group is grafted modified polyolefin resin grafted, to increase the rigidity and heat resistance of the composition in order to prevent a decrease in impact strength due to the mixing of the inorganic filler and the polyolefin resin. It is characterized by mix | blending rubber components, such as a thermoplastic elastomer.

Description

Polycarbonate resin composition

The present invention relates to a polycarbonate resin composition, and more particularly, to a polycarbonate resin composition having excellent chemical resistance and fluidity, low dependency on impact strength, and a combination of stiffness and impact strength.

Polycarbonate is known as an excellent engineering plastic because of its excellent mechanical strength such as impact strength and tensile strength, as well as transparency and heat resistance, and low molding shrinkage. It is widely used in various fields. However, the existing polycarbonate resins are easily decomposed upon contact with strong acids and strong alkalis, and thus have weak chemical resistance, low fluidity, and large thickness dependence of impact strength.

In order to make up for the disadvantages of such polycarbonates, rubber-based resins such as acrylic rubbers may be blended with polycarbonate resins (for example, Korean Patent Publication Nos. 91-7597 and 94-14646), or poly Alloys of carbonate resins with acrylonitrile-butadiene-styrene graft copolymers (U.S. Pat. 4,564,654, 4,603,169, etc., or an alloy of polycarbonate and nylon resin (Japanese Patent Laid-Open No. 59-68368) and the like have been proposed. However, the physical properties of these alloys do not deviate from the mixing laws of the constituent resins, and they have disadvantages such as acrylonitrile-butadiene-styrene resins and weak chemical resistance of nylon resins. , Physical properties such as thickness dependence and stiffness of impact strength are not harmonized.

Therefore, the present inventors solve the above problems in the conventional polycarbonate resin and polycarbonate alloy, improve the chemical resistance and fluidity of the polycarbonate resin, reduce the thickness dependency of the impact strength, the stiffness and impact strength As a result of intensive studies to provide a harmonious polycarbonate resin composition, (B) a polycarbonate resin is blended with (B) a polyolefin-based resin, and in order to increase the compatibility therebetween, a modified (C) reactive group is introduced. By blending the polyolefin resin, it was possible to improve the chemical resistance of the resin composition, the thickness dependence of the fluidity and the impact strength, and by adding (D) an inorganic filler therein, it was possible to increase the rigidity and the heat resistance of the resin composition. (E) heat to prevent a decrease in impact strength due to the combination of The present invention has been completed by discovering that the above object can be achieved by blending rubber components such as a plastic elastomer.

Accordingly, an object of the present invention is to provide a polycarbonate resin composition which is excellent in chemical resistance and fluidity, has a low thickness dependency of impact strength, and balances stiffness and impact strength.

In order to achieve the above object, the polycarbonate resin composition according to the present invention is based on the above findings, and in order to improve the thickness dependency of chemical resistance and impact strength of the polycarbonate resin, polypropylene and polyethylene are appropriately mixed. It is characteristic to mix | blend the made-up polyolefin resin, and is characterized by mix | blending the modified polyolefin resin in which the reactive group was introduce | transduced in order to increase the compatibility between them. In addition, the polycarbonate resin composition according to the present invention is characterized in that the addition amount of the inorganic filler and the rubber component is adjusted to an appropriate range in order to achieve an appropriate balance of stiffness and impact strength.

That is, the polycarbonate resin composition according to the present invention, the following components:

(A) 20 to 70 parts by weight of a polycarbonate resin having a mass average molecular weight in the range of 10,000 to 100,000 and a melt index of 2 to 25 g / 10 minutes (300 ° C., 1.2 kgf);

(B) a mixture of a polypropylene resin having a melt index of 0.5 to 60 g / 10 minutes (230 ° C., 2.16 kg f) and a polyethylene resin having a melt index of 0.01 to 20 g / 10 minutes (190 ° C., 2.16 kg f). 20 to 70 parts by weight of a polyolefin resin having a weight ratio of polypropylene to polyethylene in the range of 2 to 10;

(C) 1 to 10 parts by weight of a modified polyolefin resin obtained by grafting a monomer containing a polar group or a reactive group to the polyolefin resin;

(D) 1 to 25 parts by weight of the inorganic filler; And

(E) It is characterized by containing 1-25 weight part of thermoplastic elastomers.

Hereinafter, each component which comprises the polycarbonate resin composition of this invention is demonstrated more concretely.

The polycarbonate resin as the component (A) constituting the polycarbonate resin composition of the present invention has a mass average molecular weight in the range of 10,000 to 100,000, preferably 15,000 to 35,000, and a melt index of 2 to 25 g / 10 minutes (300 ° C). , 1.2 kgf), preferably those in the range of 4 to 16 g / 10 min (300 ° C, 1.2 kgf) are used. As the content of polycarbonate resin in the overall resin composition increases, the mechanical properties such as stiffness and impact strength and heat resistance are excellent, and the molding shrinkage rate is low, while the thickness dependency of impact strength is increased, fluidity is decreased, and chemical resistance is decreased. Tends to be. For this reason, polycarbonate resin is mix | blended in the content of 20-70 weight part, Preferably it is 35-65 weight part.

In addition, the polyolefin resin as component (B) added in order to improve the thickness dependence of impact strength and the fluidity and chemical resistance with increasing polycarbonate resin content is a mixture of polypropylene resin and polyethylene resin, and polycarbonate and polyolefin In order to reduce the morphological change of the final blend due to the difference in fluidity in the extruder during the preparation of the blends, the melt index of the polyolefin resin is determined by the melt index of the polycarbonate of component (A). Polypropylene resin having an index of 0.5 to 60 g / 10 min (230 ° C., 2.16 kg f), preferably 1.5 to 25 g / 10 min (230 ° C., 2.16 kg f), and a melt index of 0.01 to 20 g / 10 min ( 190 ° C, 2.16 kgf), preferably a polyethylene resin of 0.1 to 10 g / 10 minutes (190 ° C, 2.16 kgf), the weight ratio of polypropylene to polyethylene is 2 to 10, preferably 3 to 9 That The dragon. The polyolefin resin thus constructed is blended in an amount of 20 to 70 parts by weight, preferably 35 to 65 parts by weight.

The polypropylene resin uses a propylene homopolymer or a copolymer with ethylene of 1 to 20 mol%, preferably 6 to 18 mol%, and has a high impact strength of the copolymer itself, and a polyethylene resin mixed with (E In consideration of high compatibility with the thermoplastic elastomer added as the component), it is preferable to use an ethylene-propylene copolymer. The polyethylene resin is an ethylene homopolymer or a copolymer of an alpha olefin having 3 to 10 carbon atoms, particularly preferably propylene, 1-butene, 4-methyl-1-pentene or 1-hexene.

Moreover, in the polycarbonate resin composition of this invention, the modified polyolefin resin which introduce | transduced the polar group or reactive group as (C) component added in order to improve the compatibility between (A) component and (B) component is polyethylene or a polypropylene resin. For example, monomers such as maleic anhydride, glycidyl methacrylate, acrylic acid, methacrylic acid, oxazoline, styrene, and glycidyl methacrylate are preferably 0.1 to 7% by mass, preferably Use the one grafted at a graft rate of 1 to 6%. The compatibilization effect of (C) component is interpreted by the chemical reaction or physical affinity to the (A) polycarbonate resin by a reactive group, and the physical affinity of the polyolefin chain to which the reactive group is grafted, and (B) polyolefin resin. .

The modified polyolefin resin may be prepared by a conventional graft method, that is, after blending 0.05 to 1.0 parts by weight of the graft reaction initiator and 0.1 to 3.0 parts by weight of the monomer having a reactive group with 100 parts by weight of the polyolefin resin, a biaxial extruder is used. It can be easily manufactured by training extrusion. Examples of the graft reaction initiators are organic peroxides such as benzoyl peroxide, lauryl peroxide, dicumyl peroxide, bis (t-butylperoxyisopropyl) benzene, 2,5-dimethyl-2,5-di (t-butylper Oxy) hexane, 2,5-dimethyl-2,5-di (t-butylperoxy) -3-hexene and the like may be used, preferably 2,5-dimethyl-2,5-di (t-butyl) Peroxy) hexane is preferred. Component (C) thus prepared is blended in an amount of 1 to 10 parts by weight, preferably 3 to 7 parts by weight.

In the polycarbonate resin composition according to the present invention, an inorganic filler is added as the component (D) in order to increase the rigidity and heat resistance of the finished resin composition. As the inorganic filler, talc, silica, glass fiber, glass flakes, carbon black, potassium sulfate, calcium carbonate, calcium silicate, titanium oxide, alumina, asbestos, talc, clay, mica, quartz powder, etc. can be used. It is preferable to use talc and glass fibers in which the stiffness of the resin composition is increased with increasing content. This tendency has a significant increase in glass fiber compared to talc, but has the disadvantage of lowering the impact strength. Therefore, it is important to adjust the addition amount of talc or glass fiber to an appropriate range for proper matching between stiffness and impact strength. In the present invention (D) as an ingredient, inorganic fillers such as talc and glass fibers are blended in an amount of 1 to 25 parts by weight, preferably 5 to 20 parts by weight. The talc used in the present invention has an average particle size of 1 to 30 µm, preferably 5 to 10 µm, and glass fibers have a diameter of 10 to 30 µm, a length of 3 to 10 mm, and preferably 5 to 7 mm. It is

In addition, the polycarbonate resin composition according to the present invention, in order to prevent a decrease in the impact strength due to the combination of the (B) polyolefin resin and (D) inorganic filler, that is, to achieve a suitable balance between the stiffness and the impact strength , (E) A thermoplastic elastomer is added as a component. As the thermoplastic elastomer, ethylene-propylene rubber (EPR), ethylene-propylene-diene rubber (EPDM), ethylene-octene copolymer, styrene-butadiene rubber (SBR) and the like can be used. It is preferable to use an ethylene-octene copolymer that can significantly reduce the stiffness of the impact which is remarkably reduced and relatively low in impact strength. The ethylene-octene copolymer has an octene content of 10 to 30%, preferably 23 to 25%, a melt index of 0.5 to 8 g / 10 minutes (190 ° C, 2.16 kgf), and a density of 0.868 to 0.885 g / cc. We use thing (ENGENG series of DuPont Dow Elastomer). As described above, in order to achieve an appropriate balance of stiffness and impact strength, it is important to adjust the addition amount of the inorganic filler and the rubber component in an appropriate range. In the present invention, the thermoplastic elastomer as the component (E) is 1 to 25 parts by weight, Preferably it is mix | blended in the content of 5-20 weight part.

EMBODIMENT OF THE INVENTION Hereinafter, the structure and effect | action of the resin composition of this invention are given more concretely, for an Example and a comparative example. However, the present invention is not limited to these examples.

In the following Examples and Comparative Examples, the physical properties of the composition were evaluated by the following test method.

(1) Melt Index:

It was measured according to the standard of ASTM D-1238. The polycarbonate resin was measured at 300 ° C. and 1.2 kgf, the polyethylene resin at 190 ° C. and 2.16 kgf, the polypropylene resin at 230 ° C. and 2.16 kgf, and the polycarbonate resin composition of the present invention was 250 ° C. and 10 kg. Measured at f.

(2) Flexural modulus and flexural strength

Measurement was made according to the standards of ASTM D-790. Specimen size was 12.7 x 127 x 6.4 mm, and the speed of the crosshead under test conditions was 28 mm / min.

(3) Izod impact strength:

Measurement was made according to the standards of ASTM D-256. In order to measure the thickness dependence of impact strength, two specimen types (63.5 × 12.7 × 3mm and 63.5 × 12.7 × 6mm) were used.

(4) Chemical resistance:

Chemical resistance was measured by immersing a 50 × 10 × 1 mm specimen in sulfuric acid and 100 cc of 30% ammonium hydroxide solution at 20 ° C. for 7 days, and then observing the appearance and the weight change. The weight change is divided into 0 ~ 1.5%, 1.5 ~ 5%, 5 ~ 10%, and 10 ~ 50%, and marked as ◎, ○, △, ×, respectively. When colored with, it is represented by Ic, and when colored strongly, it is represented by fc.

<Examples 1-5>

As the component (A), 45 parts by weight of a polycarbonate resin having a mass average molecular weight of 23,000 and a melt index of 10 g / 10 minutes (300 DEG C, 1.2 kgf), the melt index of 0.5, 1.5, 4, 8, 25 g / 10 min (230 ° C., 2.16 kg f), 25 parts by weight of propylene-ethylene copolymer resin having an ethylene content of 6.2 to 6.9 mol%, and a melt index of 0.35 g / 10 min (190 ° C., 2.16 kg) 5 parts by weight of polyethylene resin (f), 5 parts by weight of polypropylene resin grafted with glycidyl methacrylate as component (C), 10 parts by weight of talc having an average diameter of 7 μm as component (D), and (E 10 parts by weight of an ethylene-octene copolymer having an octene content of 25% and a melt index of 0.5 g / 10 min (190 ° C., 2.16 kgf), followed by mixing in a Henschel mixer for 3 minutes, and then Extrusion, cooling, and solidification at 260 ° C gave a pellet-like composition. The physical properties of the obtained composition were measured according to the test method described above, and the results are shown in Table 1.

<Examples 6-9>

As the component (A), 25, 35, 50, and 55 parts by weight of a polycarbonate resin having a mass average molecular weight of 23,000 and a melt index of 10 g / 10 minutes (300 DEG C, 1.2 kgf), respectively, is a melt index as the component (B). Propylene-ethylene copolymer resin having 1.5 g / 10 min (230 ° C., 2.16 kgf) and ethylene content of 6.8%, respectively, 45, 35, 20, 15 parts by weight, and melt index of 0.35 g / 10 min (190). 5 parts by weight of polyethylene resin having a temperature of 2.16 kgf), 5 parts by weight of polypropylene resin grafted with glycidyl methacrylate as component (C), and 10 parts by weight of talc having an average diameter of 7 μm as component (D). And 10 parts by weight of an ethylene-octene copolymer having an octene content of 25% and a melt index of 0.5 g / 10 min (190 ° C., 2.16 kgf) as a component (E), followed by mixing for 3 minutes using a Henschel mixer. It extruded, cooled, and solidified at 230-260 degreeC with the extruder, and obtained the composition of the pellet form. The physical properties of the obtained composition were measured according to the test method described above, and the results are shown in Table 1.

<Examples 10-12>

(A) As a component, 45 mass parts of polycarbonate resin whose mass mean molecular weight is 23,000 and melt index is 10g / 10min (300 degreeC, 1.2kgf), and melt index is 1.5g / 10min (B) component ( 230 ° C., 2.16 kgf), 20, 23, 27 parts by weight of propylene-ethylene copolymer resin having an ethylene content of 6.7%, and a polyethylene resin having a melt index of 0.35 g / 10 minutes (190 ° C., 2.16 kgf), respectively. 10, 7, 3 parts by weight of each, (C) 5 parts by weight of a polypropylene resin grafted glycidyl methacrylate as a component, (D) 10 parts by weight of talc having an average diameter of 7 μm as a component, and (E 10 parts by weight of an ethylene-octene copolymer having an octene content of 25% and a melt index of 0.5 g / 10 minutes (190 DEG C, 2.16 kgf), followed by mixing for 3 minutes with a Henschel mixer, followed by mixing with an extruder. Extrusion, cooling, and solidification at 260 ° C gave a pellet-like composition. The physical properties of the obtained composition were measured according to the test method described above, and the results are shown in Table 1.

<Examples 13-17>

(A) As a component, 45 mass parts of polycarbonate resin whose mass mean molecular weight is 23,000 and melt index is 10g / 10min (300 degreeC, 1.2kgf), and melt index is 1.5g / 10min (B) component ( Propylene-ethylene copolymer resin of 230 ° C. and 2.16 kgf) and ethylene content of 6.8%, respectively, 29, 27, 23, 21, 20 parts by weight, and a melt index of 0.35 g / 10 minutes (190 ° C., 2.16 kgf). 5 parts by weight of polyethylene resin), 1, 3, 7, 9, 10 parts by weight of polypropylene resin grafted with glycidyl methacrylate as (C) component, and an average diameter of 7 µm as (D) component. 10 parts by weight of talc, and 10 parts by weight of an ethylene-octene copolymer having an octene content of 25% as the component (E) and a melt index of 0.5 g / 10 min (190 DEG C, 2.16 kgf), followed by a Henschel mixer. The mixture was mixed for 3 minutes, extruded, cooled, and solidified at 230 to 260 캜 with an extruder to obtain a pellet-like composition. The physical properties of the obtained composition were measured according to the test method described above, and the results are shown in Table 1.

<Examples 18-22>

(A) As a component, 45 mass parts of polycarbonate resin whose mass mean molecular weight is 23,000 and melt index is 10g / 10min (300 degreeC, 1.2kgf), and melt index is 1.5g / 10min (B) component ( 230 ° C., 2.16 kgf) and 34, 30, 22, 20, 15 parts by weight of propylene-ethylene copolymer resin having an ethylene content of 6.8%, respectively, and a melt index of 0.35 g / 10 min (190 ° C., 2.16 kgf). 5 parts by weight of polyethylene resin), 5 parts by weight of polypropylene resin grafted with glycidyl methacrylate as (C) component, and talc each having an average diameter of 7 μm as (D) component 1, 5, 13 and 15 , 20 parts by weight, and 10 parts by weight of an ethylene-octene copolymer having an octene content of 25% and a melt index of 0.5 g / 10 min (190 ° C., 2.16 kgf) as a component (E), followed by Henschel mixer. The mixture was mixed for 3 minutes, extruded, cooled, and solidified at 230 to 260 캜 with an extruder to obtain a pellet-like composition. The physical properties of the obtained composition were measured according to the test method described above, and the results are shown in Table 1.

<Examples 23-27>

(A) As a component, 45 mass parts of polycarbonate resin whose mass mean molecular weight is 23,000 and melt index is 10g / 10min (300 degreeC, 1.2kgf), and melt index is 1.5g / 10min (B) component ( 230 ° C., 2.16 kgf) and 34, 30, 25, 20, 15 parts by weight of propylene-ethylene copolymer resin having an ethylene content of 6.8%, respectively, and a melt index of 0.35 g / 10 min (190 ° C., 2.16 kgf). 5 parts by weight of polyethylene resin), 5 parts by weight of polypropylene resin grafted with glycidyl methacrylate as component (C), and glass fibers having an average diameter of 25 µm and a length of 7 mm as component (D). 1, 5, 10, 15, 20 parts by weight, and (E) 10 parts by weight of an ethylene-octene copolymer having an octene content of 25% and a melt index of 0.5 g / 10 minutes (190 ° C, 2.16 kgf) After mixing, the mixture was mixed with a Henschel mixer for 3 minutes, extruded, cooled, and solidified at 230 to 260 ° C with an extruder to obtain a pellet-like composition. The physical properties of the obtained composition were measured according to the test method described above, and the results are shown in Table 1.

<Examples 28-32>

(A) As a component, 45 mass parts of polycarbonate resin whose mass mean molecular weight is 23,000 and melt index is 10g / 10min (300 degreeC, 1.2kgf), and melt index is 1.5g / 10min (B) component ( 230 ° C., 2.16 kgf) and 34, 30, 22, 20, 15 parts by weight of propylene-ethylene copolymer resin having an ethylene content of 6.8%, respectively, and a melt index of 0.35 g / 10 min (190 ° C., 2.16 kgf). 5 parts by weight of a polyethylene resin of 5), 5 parts by weight of a polypropylene resin grafted with glycidyl methacrylate as the component (C), 10 parts by weight of talc having an average diameter of 7 µm as the component (D), and (E) As an ingredient, 1, 5, 13, 15, and 20 parts by weight of an ethylene-octene copolymer having an octene content of 25% and a melt index of 0.5 g / 10 min (190 ° C and 2.16 kgf) were respectively mixed, followed by Henschel mixer. The mixture was mixed for 3 minutes, extruded, cooled, and solidified at 230 to 260 캜 with an extruder to obtain a pellet-like composition. The physical properties of the obtained composition were measured according to the test method described above, and the results are shown in Table 1.

Comparative Example 1

(B), (C), (D), and (E) to 100 parts by weight of a polycarbonate resin having a mass average molecular weight of 23,000 as the component (A) and a melt index of 10 g / 10 minutes (300 占 폚, 1.2 kgf). ) Except not blended, the components were carried out in the same manner as in Example 1 to obtain a resin composition. The physical properties of the composition were measured according to the test method described above, and the results are shown in Table 1.

Comparative Example 2

(A) As a component, 45 mass parts of polycarbonate resin whose mass mean molecular weight is 23,000 and melt index is 10g / 10min (300 degreeC, 1.2kgf), and melt index is 1.5g / 10min (B) component ( Example 2, except that 55 parts by weight of propylene-ethylene copolymer resin having a temperature of 230 ° C., 2.16 kgf) and an ethylene content of 6.8%, and the components (C), (D) and (E) were not blended. It carried out by the same method as 1, and obtained the resin composition. The physical properties of the composition were measured according to the test method described above, and the results are shown in Table 1.

Comparative Example 3

(A) As a component, 45 mass parts of polycarbonate resin whose mass mean molecular weight is 23,000 and melt index is 10g / 10min (300 degreeC, 1.2kgf), and melt index is 1.5g / 10min (B) component ( 230 ° C., 2.16 kgf), 35 parts by weight of propylene-ethylene copolymer resin having an ethylene content of 6.8%, and 5 parts by weight of polyethylene resin having a melt index of 0.35 g / 10 minutes (190 ° C., 2.16 kgf), ( C) 5 parts by weight of polypropylene resin grafted with glycidyl methacrylate as a component, and 10 parts by weight of talc having an average diameter of 7 μm as a component (D), except that (E) was not added. Then, it carried out by the same method as Example 1 and obtained the resin composition. The physical properties of the composition were measured according to the test method described above, and the results are shown in Table 1.

<Comparative Example 4>

(A) As a component, 45 mass parts of polycarbonate resin whose mass mean molecular weight is 23,000 and melt index is 10g / 10min (300 degreeC, 1.2kgf), and melt index is 1.5g / 10min (B) component ( 230 ° C., 2.16 kgf), 35 parts by weight of propylene-ethylene copolymer resin having an ethylene content of 6.8%, and 5 parts by weight of polyethylene resin having a melt index of 0.35 g / 10 minutes (190 ° C., 2.16 kgf), ( C) 5 parts by weight of a polypropylene resin grafted with glycidyl methacrylate as a component, and an octene content of 25% as a component (E), and a melt index of 0.5 g / 10 min (190 DEG C, 2.16 kgf) 10 weight part of phosphorus ethylene-octene copolymers were mix | blended, and it carried out by the method similar to Example 1 except not having mix | blended (D) component, and obtained the resin composition. The physical properties of the composition were measured according to the test method described above, and the results are shown in Table 1.

Parts by weight Melt Index (g / 10min) Izod impact strength (kgcm / cm) Flexural Strength (㎏ / ㎠) Flexural modulus (㎏ / ㎠) Chemical resistance A B ^* C D E 3 mm 6 mm acid Basic Example One 45 25/5 5 10 10 43 47 45 568 19,800 n ◎ n ◎ 2 45 25/5 5 10 10 55 58 58 576 20,600 n ◎ n ◎ 3 45 25/5 5 10 10 78 50 50 571 20,500 n ◎ n ◎ 4 45 25/5 5 10 10 108 39 36 574 20,300 n ◎ n ◎ 5 45 25/5 5 10 10 230 28 25 575 21,000 n ◎ n ◎ 6 25 45/5 5 10 10 57 43 40 534 19,100 n ◎ n ◎ 7 35 35/5 5 10 10 55 51 47 561 20,100 n ◎ n ◎ 8 50 20/5 5 10 10 56 65 60 632 21,500 n ◎ n ◎ 9 55 15/5 5 10 10 54 72 69 670 22,100 Ic ○ Ic ○ 10 45 20/10 5 10 10 53 65 64 564 20,100 n ◎ n ◎ 11 45 23/7 5 10 10 54 62 60 570 20,300 n ◎ n ◎ 12 45 27/3 5 10 10 57 55 55 580 20,900 n ◎ n ◎ 13 45 29/5 One 10 10 49 50 48 574 20,200 n ◎ n ◎ 14 45 27/5 3 10 10 52 56 53 575 20,300 n ◎ n ◎ 15 45 23/5 7 10 10 65 58 57 575 20,500 n ◎ n ◎ 16 45 21/5 9 10 10 70 57 54 570 20,400 n ◎ n ◎ 17 45 20/5 10 10 10 81 55 52 565 20,000 n ◎ n ◎ 18 45 34/5 5 One 10 55 75 70 530 18,400 n ◎ n ◎ 19 45 30/5 5 5 10 56 64 62 551 19,200 n ◎ n ◎ 20 45 22/5 5 13 10 59 53 51 588 21,000 n ◎ n ◎ 21 45 20/5 5 15 10 62 45 40 601 24,400 n ◎ n ◎ 22 45 15/5 5 20 10 65 40 35 665 27,700 n ◎ n ◎ 23 45 34/5 5 One 10 58 63 59 583 19,200 n ◎ n ◎ 24 45 30/5 5 5 10 57 42 37 625 25,700 n ◎ n ◎ 25 45 25/5 5 10 10 55 36 36 835 35,000 n ◎ n ◎ 26 45 20/5 5 15 10 52 24 23 920 49,000 n ◎ n ◎ 27 45 15/5 5 20 10 58 20 18 1100 62,000 n ◎ n ◎ 28 45 34/5 5 10 One 61 32 32 635 23,700 n ◎ n ◎ 29 45 30/5 5 10 5 59 44 40 604 21,500 n ◎ n ◎ 30 45 22/5 5 10 13 56 63 57 557 20,000 n ◎ n ◎ 31 45 20/5 5 10 15 53 72 71 537 18,600 n ◎ n ◎ 32 45 15/5 5 10 20 51 80 74 495 17,900 n ◎ n ◎ Comparative example One 100 0 0 0 0 10 ^** 78 47 796 20,100 fc × fc × 2 45 55/0 0 0 0 64 39 34 504 17,200 n ◎ n ◎ 3 45 35/5 5 10 0 67 15 10 642 24,500 n ◎ n ◎ 4 45 35/5 5 0 10 68 80 75 504 15,100 n ◎ n ◎ (Note) * The polyolefin resin of (B) component was shown by the weight part of polypropylene / polyethylene resin. ** The measurement conditions of melt index were 300 degreeC and 1.2 kgf.

As described above, according to the present invention, it is possible to obtain a polycarbonate resin composition which is excellent in fluidity and chemical resistance, not only has improved thickness dependency of impact strength, but also has a good balance between stiffness and impact strength.

Claims (6)

In the polycarbonate resin composition, the following components: (A) 20 to 70 parts by weight of a polycarbonate resin having a mass average molecular weight in the range of 10,000 to 100,000 and a melt index of 2 to 25 g / 10 minutes (300 ° C., 1.2 kgf); (B) a mixture of a polypropylene resin having a melt index of 0.5 to 60 g / 10 minutes (230 ° C., 2.16 kg f) and a polyethylene resin having a melt index of 0.01 to 20 g / 10 minutes (190 ° C., 2.16 kg f). 20 to 70 parts by weight of a polyolefin resin having a weight ratio of polypropylene to polyethylene in the range of 2 to 10; (C) 1 to 10 parts by weight of a modified polyolefin resin obtained by grafting a monomer containing a polar group or a reactive group to the polyolefin resin; (D) 1 to 25 parts by weight of the inorganic filler; And (E) 1-25 weight part of thermoplastic elastomers, The polycarbonate resin composition characterized by the above-mentioned. The polycarbonate resin composition according to claim 1, wherein the polypropylene resin in the component (B) is a propylene-ethylene copolymer resin having an ethylene content of 1 to 20 mol%. The modified polyolefin resin according to claim 1, wherein the modified polyolefin resin into which the polar group or the reactive group as the component (C) is introduced is a polyethylene or polypropylene resin. oxazoline) and styrene is a polycarbonate resin composition characterized in that the monomer selected from the group consisting of grafted at a graft rate of 0.1 to 7% by mass. The polycarbonate resin composition according to claim 1, wherein the inorganic filler as the component (D) is talc having an average particle size of 1 to 30 µm. The polycarbonate resin composition according to claim 1, wherein the inorganic filler as the component (D) is a glass fiber having a diameter of 10 to 30 µm and a length of 3 to 10 mm. The thermoplastic elastomer as a component (E) according to claim 1, wherein the thermoplastic elastomer as the component (E) has an octene content of 10 to 30%, a melt index of 0.5 to 8 g / 10 minutes (190 ° C, 2.16 kgf), and a density of 0.868 to 0.885. Polycarbonate resin composition characterized in that the ethylene-octene copolymer is g / cc.