Polycarbonate resin composition and article produced therefrom

Abstract

A polycarbonate resin composition of the present invention comprises: about 100 parts by weight of a base resin comprising about 10-90 wt% of a polycarbonate resin and about 10-90 wt% of a polysiloxane-polycarbonate copolymer resin; about 1-10 parts by weight of a diphenylamine-based compound; and about 0.1-2 parts by weight of a polydimethylsiloxane having a terminal reactive group and having a kinematic viscosity, measured at 40 °C according to ASTM D445, of about 5-200 cSt. The polycarbonate resin composition has excellent transparency, chemical resistance, fluidity, thermal stability, balance of these physical properties, and the like.

Description

Polycarbonate resin composition and molded article formed therefrom

[0001] The present invention relates to a polycarbonate resin composition and a molded article formed therefrom. More specifically, the present invention relates to a polycarbonate resin composition having excellent transparency, chemical resistance, fluidity, thermal stability, and a balance of physical properties thereof, and a molded article formed therefrom.

[0002]

[0003] Polycarbonate resin is used in various fields, such as office automation equipment, electrical and electronic products, and construction materials, due to its excellent mechanical strength, heat resistance, and transparency. In the electrical and electronic product sector, there is a continuous trend toward slimmer and thinner products, and the demand for translucent or transparent materials is increasing to enhance design freedom. Furthermore, for home appliances, chemical resistance against substances such as dish soaps and rust inhibitors is required in addition to the mechanical properties necessary for housing materials.

[0004] Impact modifiers can be applied to improve the chemical resistance and mechanical properties of polycarbonate resins, but this may lead to a decrease in transparency. Additionally, if phosphorus-based compounds are used as plasticizers to ensure thin-film injection moldability, there is a risk that chemical resistance and mechanical properties may rapidly deteriorate.

[0005] Therefore, there is a need to develop polycarbonate resin compositions with excellent transparency, chemical resistance, fluidity, thermal stability, and a balance of these physical properties.

[0006] The background technology of the present invention is disclosed in Korean Published Patent No. 10-2022-0056273, etc.

[0007]

[0008] The objective of the present invention is to provide a polycarbonate resin composition having excellent transparency, chemical resistance, fluidity, thermal stability, and a balance of these physical properties.

[0009] Another objective of the present invention is to provide a molded article formed from the polycarbonate resin composition.

[0010] The above and other objectives of the present invention can all be achieved by the present invention described below.

[0011]

[0012] 1. One aspect of the present invention relates to a thermoplastic resin composition. The polycarbonate resin composition comprises about 100 parts by weight of a base resin comprising about 10 to about 90 parts by weight of a polycarbonate resin and about 10 to about 90 parts by weight of a polysiloxane-polycarbonate copolymer resin; about 1 to about 10 parts by weight of a diphenylamine-based compound; and about 0.1 to about 2 parts by weight of a polydimethylsiloxane having terminal reactive groups having a kinematic viscosity of about 5 to about 200 cSt measured at 40°C according to ASTM D445.

[0013] 2. In the above 1 embodiment, the polycarbonate resin may have a weight-average molecular weight of about 10,000 to about 200,000 g / mol as measured by GPC (gel permeation chromatography).

[0014] 3. In the above 1 or 2 embodiments, the polycarbonate-polysiloxane copolymer resin may comprise about 70 to about 99 weight% of a polycarbonate block and about 1 to about 30 weight% of a polysiloxane block.

[0015] 4. In the above 1 to 3 embodiments, the polycarbonate-polysiloxane copolymer resin may have a weight-average molecular weight of about 10,000 to about 50,000 g / mol as measured by gel permeation chromatography (GPC).

[0016] 5. In the above 1 to 4 embodiments, the diphenylamine-based compound may include one or more of 4,4'-bis(α,α-dimethylbenzyl)diphenylamine, phenylnaphthylamine, 4,4'-dimethoxydiphenylamine, and 4-isopropoxydiphenylamine.

[0017] 6. In the above 1 to 5 embodiments, the terminal reactive group of the polydimethylsiloxane having the terminal reactive group may include one or more of a hydroxyl group, an epoxy group, and a maleic anhydride group.

[0018] 7. In the above 1 to 6 embodiments, the weight ratio of the polysiloxane-polycarbonate copolymer resin and the diphenylamine-based compound may be about 1:0.02 to about 1:0.4.

[0019] 8. In the above 1 to 7 embodiments, the weight ratio of the polysiloxane-polycarbonate copolymer resin and the polydimethylsiloxane having terminal reactive groups may be about 1:0.005 to about 1:0.1.

[0020] 9. In the above 1 to 8 embodiments, the weight ratio of the diphenylamine-based compound and the polydimethylsiloxane having terminal reactive groups may be about 1:0.05 to about 1:1.

[0021] 10. In the above 1 to 9 embodiments, the polycarbonate resin composition may have a haze of about 3% or less of a 1 mm thick specimen measured according to ASTM D1003, and a light transmittance of about 86% or more.

[0022] 11. In the above 1 to 10 embodiments, the polycarbonate resin composition may have a fracture height of approximately 55 cm or more when a specimen with a thickness of 2 mm is immersed in a thinner solution for 2 minutes and 30 seconds, dried at 80°C for 20 minutes, left at room temperature for 24 hours, and then impacted by a drop weight evaluation device using a Dupont drop test method with a weight of 2 kg.

[0023] 12. In the above 1 to 11 embodiments, the spiral flow length of the specimen measured after injection molding in a spiral-shaped mold with a width of 10 mm and a thickness of 1 mm under conditions of a molding temperature of 320°C, a mold temperature of 60°C, an injection pressure of 100 MPa, and an injection speed of 100 mm / s may be about 130 to about 200 mm.

[0024] 13. In the above 1 to 11 embodiments, the polycarbonate resin composition may have a Vicat softening temperature (VST) of about 110 to about 135°C measured under a 5 kg load and a 50°C / hr heating condition in accordance with ISO 306.

[0025] 14. Another aspect of the present invention relates to a molded article. The molded article is characterized by being formed from a polycarbonate resin composition according to any one of 1 to 13.

[0026]

[0027] The present invention has the effect of providing a polycarbonate resin composition having excellent transparency, chemical resistance, fluidity, thermal stability, and a balance of physical properties thereof, and a molded article formed therefrom.

[0028]

[0029] The present invention will be described in detail below.

[0030] The polycarbonate resin composition according to the present invention is characterized by comprising (A) a polycarbonate resin; (B) a polysiloxane-polycarbonate copolymer resin; (C) a diphenylamine-based compound; and (D) a polydimethylsiloxane having terminal reactive groups.

[0031] In this specification, "a to b" indicating a numerical range is defined as "≥a and ≤b".

[0032]

[0033] (A) Polycarbonate resin

[0034] As the polycarbonate resin according to one embodiment of the present invention, a polycarbonate resin used in conventional thermoplastic resin compositions may be used. For example, an aromatic polycarbonate resin prepared by reacting diphenols (aromatic diol compounds) with a carbonate precursor such as phosgene, halogen formate, or carbonate diester may be used.

[0035] In a specific example, the above diphenols may be exemplified as 4,4'-biphenol, 2,2-bis(4-hydroxyphenyl)propane, 2,4-bis(4-hydroxyphenyl)-2-methylbutane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 2,2-bis(3-chloro-4-hydroxyphenyl)propane, 2,2-bis(3,5-dichloro-4-hydroxyphenyl)propane, 2,2-bis(3-methyl-4-hydroxyphenyl)propane, 2,2-bis(3,5-dimethyl-4-hydroxyphenyl)propane, etc., but are not limited thereto. For example, 2,2-bis(4-hydroxyphenyl)propane, 2,2-bis(3,5-dichloro-4-hydroxyphenyl)propane, 2,2-bis(3-methyl-4-hydroxyphenyl)propane, 2,2-bis(3,5-dimethyl-4-hydroxyphenyl)propane, or 1,1-bis(4-hydroxyphenyl)cyclohexane may be used, and specifically, 2,2-bis(4-hydroxyphenyl)propane called bisphenol-A may be used.

[0036] In a specific example, examples of the carbonate precursors include dimethyl carbonate, diethyl carbonate, dibutyl carbonate, dicyclohexyl carbonate, diphenyl carbonate, ditoryl carbonate, bis(chlorophenyl)carbonate, m-cresyl carbonate, dinaphthyl carbonate, carbonyl chloride (phosgene), diphosgene, triphosgene, carbonyl bromide, bishaloformate, etc. These may be used individually or in a mixture of two or more.

[0037] The above polycarbonate resin may be used having branched chains, and may be prepared, for example, by adding about 0.05 to about 2 mol% of a trivalent or higher polyfunctional compound, specifically a compound having a trivalent or higher phenolic group, to the total amount of diphenols used in the polymerization.

[0038] The above polycarbonate resin can be used in the form of a homopolycarbonate resin, a copolycarbonate resin, or a blend thereof. In addition, the above polycarbonate resin may be partially or entirely replaced with an aromatic polyester-carbonate resin obtained by polymerizing in the presence of an ester precursor, for example, a difunctional carboxylic acid.

[0039] In a specific example, the polycarbonate resin may have a weight-average molecular weight (Mw) measured by gel permeation chromatography (GPC) of about 10,000 to about 200,000 g / mol, for example, about 15,000 to about 100,000 g / mol. Within this range, the mechanical properties, heat resistance, etc. of the thermoplastic resin composition may be excellent.

[0040] In a specific example, the polycarbonate resin may be included in an amount of about 10 to about 90 weight%, for example, about 20 to about 80 weight%, of a base resin (A+B) comprising a polycarbonate resin and a polysiloxane-polycarbonate copolymer resin, in 100 weight% of the base resin. If the content of the polycarbonate resin is less than about 10 weight% of the 100 weight% of the base resin, there is a risk that the transparency of the polycarbonate resin composition, etc., may be reduced, and if it exceeds about 90 weight%, there is a risk that the transparency, chemical resistance, etc., of the polycarbonate resin composition may be reduced.

[0041]

[0042] (B) Polysiloxane-polycarbonate copolymer resin

[0043] A polysiloxane-polycarbonate copolymer resin according to one embodiment of the present invention is applied together with a polycarbonate resin, a diphenylamine-based compound, and a polydimethylsiloxane having terminal reactive groups, and can improve the transparency, chemical resistance, fluidity, thermal stability, and balance of physical properties of a polycarbonate resin composition, and comprises a polycarbonate block and a polysiloxane block. For example, it may be a triblock copolymer of a polycarbonate block / polysiloxane block / polycarbonate block, but is not limited thereto.

[0044] In a specific example, the polysiloxane-polycarbonate copolymer resin may be a polysiloxane-polycarbonate copolymer resin prepared by reacting a siloxane compound represented by the following chemical formula 1, an aromatic dihydroxy compound, and a carbonate precursor.

[0045] [Chemical Formula 1]

[0046]

[0047] In the above formula 1, R1 and R2 are each independently a C1-C10 alkyl group, a C6-C18 aryl group, or a C1-C10 alkyl group or a C6-C18 aryl group having a halogen atom or an alkoxy group; A is each independently a substituted or unsubstituted C2-C20 hydrocarbon group, or a substituted or unsubstituted C2-C20 hydrocarbon group having -O- or -S-; Y is each independently a hydrogen atom, a halogen atom, a C1-C18 alkyl halide group, a cyano group (-CN), or an ester group; and m can be 2 to 1,000, for example 4 to 120, specifically 10 to 100.

[0048] In a specific example, the aromatic dihydroxy compound (diphenol) may be an aromatic dihydroxy compound used in the manufacture of conventional polycarbonate resins, such as 4,4'-biphenol, 2,2-bis(4-hydroxyphenyl)propane, 2,4-bis(4-hydroxyphenyl)-2-methylbutane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 2,2-bis(3-chloro-4-hydroxyphenyl)propane, 2,2-bis(3,5-dichloro-4-hydroxyphenyl)propane, etc., but is not limited thereto. Specifically, 2,2-bis(4-hydroxyphenyl)propane, 2,2-bis(3,5-dichloro-4-hydroxyphenyl)propane, 1,1-bis(4-hydroxyphenyl)cyclohexane, etc. can be used, and preferably, 2,2-bis(4-hydroxyphenyl)propane, also known as bisphenol A, can be used.

[0049] In a specific example, the carbonate precursor may be exemplified as phosgene, triphosgene, diaryl carbonate, mixtures thereof, etc. Additionally, the diaryl carbonate may be exemplified as diphenyl carbonate, ditoryl carbonate, bis(chlorophenyl) carbonate, m-cresyl carbonate, dinaphthyl carbonate, bis(diphenyl) carbonate, diethyl carbonate, dimethyl carbonate, dibutyl carbonate, dicyclohexyl carbonate, etc., but is not limited thereto. These may be used alone or in combination of two or more, and for example, diphenyl carbonate, etc. may be used.

[0050] In a specific example, the polycarbonate-polysiloxane copolymer may comprise about 70 to about 99 weight%, for example, about 80 to about 97 weight% of a polycarbonate block derived from the aromatic dihydroxy compound, and about 1 to about 30 weight%, for example, about 3 to about 25 weight% of a polysiloxane block derived from the siloxane compound. Within this range, the impact resistance, chemical resistance, flame retardancy, etc. of the polycarbonate resin composition may be excellent.

[0051] In a specific example, the polycarbonate-polysiloxane copolymer may have a weight-average molecular weight (Mw) measured by gel permeation chromatography (GPC) of about 10,000 to about 50,000 g / mol, for example, about 15,000 to about 40,000 g / mol. Within this range, the impact resistance, chemical resistance, flame retardancy, moldability, etc. of the polycarbonate resin composition may be excellent.

[0052] In a specific example, the polycarbonate-polysiloxane copolymer can be prepared by conventional methods. For example, the aromatic dihydroxy compound, carbonate precursor, and siloxane compound can be copolymerized using interfacial condensation polymerization, emulsion polymerization, etc. Additionally, a commercially available product may be used as the polycarbonate-polysiloxane copolymer.

[0053] In a specific example, the polysiloxane-polycarbonate copolymer resin may be included in an amount of about 10 to about 90 weight%, specifically about 20 to about 80 weight%, of a base resin (A+B) comprising a polycarbonate resin and a polysiloxane-polycarbonate copolymer resin, in 100 weight% of the base resin. If the content of the polysiloxane-polycarbonate copolymer resin is less than about 10 weight% of the base resin, there is a risk that the transparency, chemical resistance, etc. of the polycarbonate resin composition will be reduced, and if it exceeds about 90 weight%, there is a risk that the transparency, etc. of the polycarbonate resin composition will be reduced.

[0054]

[0055] (C) Diphenylamine compounds

[0056] A diphenylamine-based compound according to one embodiment of the present invention can be applied together with a polycarbonate resin, a polysiloxane-polycarbonate copolymer resin, and a polydimethylsiloxane having terminal reactive groups, and can improve the transparency, chemical resistance, fluidity, thermal stability, and balance of physical properties of a polycarbonate resin composition, and a diphenylamine-based compound used in a conventional thermoplastic resin composition can be used.

[0057] In a specific example, the diphenylamine-based compound may include 4,4'-bis(α,α-dimethylbenzyl)diphenylamine, phenylnaphthylamine, 4,4'-dimethoxydiphenylamine, 4-isopropoxydiphenylamine, combinations thereof, etc.

[0058] In a specific example, the diphenylamine-based compound may be included in an amount of about 1 to about 10 parts by weight, for example, about 1.5 to about 6 parts by weight, per about 100 parts by weight of the base resin. If the content of the diphenylamine-based compound is less than about 1 part by weight per about 100 parts by weight of the base resin, there is a risk that the fluidity of the polycarbonate resin composition will decrease, and if it exceeds about 10 parts by weight, there is a risk that the chemical resistance, thermal stability, injection moldability, etc. of the polycarbonate resin composition will decrease.

[0059] In a specific example, the weight ratio of the polysiloxane-polycarbonate copolymer resin and the diphenylamine-based compound may be about 1:0.02 to about 1:0.4, for example, about 1:0.03 to about 1:0.2. Within this range, the chemical resistance, fluidity, thermal stability, etc. of the polycarbonate resin composition may be superior.

[0060]

[0061] (D) Polydimethylsiloxane having terminal reactive groups

[0062] A polydimethylsiloxane having terminal reactive groups according to one embodiment of the present invention can be applied together with a polycarbonate resin, a polysiloxane-polycarbonate copolymer resin, and a diphenylamine-based compound to improve the transparency, chemical resistance, fluidity, thermal stability, and balance of physical properties of a polycarbonate resin composition. In this case, a polydimethylsiloxane having terminal reactive groups having a kinematic viscosity of about 5 to about 200 cSt measured at 40°C according to ASTM D445 can be used.

[0063] In a specific example, the polydimethylsiloxane having the terminal reactive group may have a kinematic viscosity of about 5 to about 200 cSt, for example, about 10 to about 100 cSt, measured at 40°C according to ASTM D445. If the kinematic viscosity of the polydimethylsiloxane having the terminal reactive group is less than about 5 cSt, there is a risk that the thermal stability, moldability, impact resistance, etc. of the polycarbonate resin composition will be reduced, and if it exceeds about 200 cSt, there is a risk that the transparency, moldability, etc. of the polycarbonate resin composition will be reduced.

[0064] In a specific example, the terminal reactive group of the polydimethylsiloxane having the terminal reactive group may include one or more of a hydroxyl group, an epoxy group, and a maleic anhydride group.

[0065] In a specific example, the polydimethylsiloxane having the terminal reactive group may be included in an amount of about 0.1 to about 2 parts by weight, for example, about 0.5 to about 1.5 parts by weight, per about 100 parts by weight of the base resin. If the content of the polydimethylsiloxane having the terminal reactive group is less than about 0.1 parts by weight per about 100 parts by weight of the base resin, there is a risk that the chemical resistance of the polycarbonate resin composition may be reduced, and if it exceeds about 2 parts by weight, there is a risk that the transparency of the polycarbonate resin composition may be reduced.

[0066] In a specific example, the weight ratio of the polysiloxane-polycarbonate copolymer resin and the polydimethylsiloxane having terminal reactive groups may be about 1:0.005 to about 1:0.1, for example, about 1:0.01 to about 1:0.07. Within this range, the transparency, chemical resistance, etc., of the polycarbonate resin composition may be superior.

[0067] In a specific example, the weight ratio of the diphenylamine-based compound and the polydimethylsiloxane having terminal reactive groups may be about 1:0.05 to about 1:1, for example, about 1:0.1 to about 1:0.8. Within this range, the transparency, chemical resistance, fluidity, etc., of the polycarbonate resin composition may be superior.

[0068]

[0069] A polycarbonate resin composition according to one embodiment of the present invention may further include conventional additives as needed. Examples of such additives include flame retardants, antioxidants, release agents, lubricants, nucleating agents, antistatic agents, stabilizers, pigments, dyes, mixtures thereof, etc. When using such additives, the content may be about 0.001 to about 20 parts by weight per about 100 parts by weight of the base resin, but is not limited thereto.

[0070]

[0071] A polycarbonate resin composition according to one embodiment of the present invention can be manufactured by a known method for manufacturing a polycarbonate resin composition. For example, after mixing the above components and, if necessary, other additives, the composition can be manufactured in the form of pellets by melt-extruding using a conventional twin-screw extruder at about 260 to about 300°C, for example, about 270 to about 290°C.

[0072] In a specific example, the polycarbonate resin composition may have a haze of about 3% or less, for example, about 1 to about 2.9%, of a 1 mm thick specimen measured according to ASTM D1003, and a light transmittance of about 86% or more, for example, about 88 to about 95%.

[0073] In a specific example, the polycarbonate resin composition may have a thickness of 2 mm, which is immersed in a thinner solution for 2 minutes and 30 seconds, dried at 80°C for 20 minutes, left at room temperature for 24 hours, and then impacted by a drop weight evaluation device using a Dupont drop test method with a weight of 2 kg, so that the height at which the specimen breaks is about 55 cm or more, for example, about 58 to about 99 cm.

[0074] In a specific example, the spiral flow length of a specimen measured after injection molding in a spiral-shaped mold with a width of 10 mm and a thickness of 1 mm under conditions of a molding temperature of 320°C, a mold temperature of 60°C, an injection pressure of 100 MPa, and an injection speed of 100 mm / s may be about 130 to about 200 mm, for example, about 135 to about 180 mm.

[0075] In a specific example, the polycarbonate resin composition may have a Vicat softening temperature (VST) of about 110 to about 135°C, for example, about 120 to about 130°C, measured under a 5 kg load and a 50°C / hr heating condition in accordance with ISO 306.

[0076]

[0077] The molded article according to the present invention is formed from the polycarbonate resin composition. For example, the polycarbonate resin composition can be used to manufacture various molded articles (products) through various molding methods such as injection molding, extrusion molding, vacuum molding, and casting molding. Such molding methods are well known to those skilled in the art to which the present invention pertains. Since the molded article exhibits excellent transparency, chemical resistance, fluidity, thermal stability, and a balance of these physical properties, it is particularly useful as an interior or exterior material for electrical / electronic products.

[0078]

[0079] Hereinafter, the structure and operation of the present invention will be explained in more detail through preferred embodiments of the present invention. However, these are presented as preferred examples of the present invention and should not be interpreted in any way as limiting the present invention.

[0080]

[0081] Examples

[0082] The specifications of each component used in the following examples and comparative examples are as follows.

[0083] (A) Polycarbonate resin

[0084] Bisphenol-A-based polycarbonate resin (weight-average molecular weight (Mw): 22,000 g / mol) was used.

[0085] (B) Polysiloxane-polycarbonate copolymer resin

[0086] A polysiloxane-polycarbonate copolymer resin with a polydimethylsiloxane (PDMS) content of 6 wt% and a weight-average molecular weight (Mw) of 22,000 g / mol was used.

[0087] (C) Diphenylamine compounds

[0088] 4,4'-bis(α,α-dimethylbenzyl)diphenylamine (CAS 10081-67-1) was used.

[0089] (D) Polydimethylsiloxane

[0090] (D1) Polydimethylsiloxane (kinematic viscosity: 40 cSt) having terminal reactive groups (hydroxyl groups) was used.

[0091] (D2) Polydimethylsiloxane (Manufacturer: Momentive, Product name: PMX-200, Kinematic viscosity: 40 cSt) was used.

[0092] (E) Phosphorus compounds

[0093] Bisphenol-A diphosphate (BDP, Manufacturer: DAIHACHI, Product Name: DVP506), which is a flame retardant and plasticizer, was used.

[0094]

[0095] Examples 1 to 7 and Comparative Examples 1 to 8

[0096] Each of the above components was added in the amounts listed in Tables 1, 2, and 3 below, and pellets were prepared by extrusion at approximately 280°C. A twin-screw extruder with L / D=36 and a diameter of 45 mm was used for extrusion. The prepared pellets were dried at approximately 80°C for at least 5 hours, and then injection molded in a 6 oz injection molding machine (molding temperature: approximately 310°C) to produce specimens. The physical properties of the prepared specimens were evaluated by the following method, and the results are shown in Tables 1, 2, and 3 below.

[0097]

[0098] Methods for measuring physical properties

[0099] (1) Haze and light transmittance (unit: %): The haze and light transmittance (total light transmittance) of a 1 mm thick specimen were measured using a Nippon Denshoku Haze meter NDH 2000 in accordance with ASTM D1003.

[0100] (2) Evaluation of chemical resistance (impact resistance after coating): A 2 mm thick specimen was immersed in a thinner solution for 2 minutes and 30 seconds, dried at 80°C for 20 minutes, left at room temperature for 24 hours, and then subjected to a drop test using a 2 kg weight, and the height at which the specimen broke (unit: cm) was measured.

[0101] (3) Spiral flow length (unit: mm): Under conditions of molding temperature 320℃, mold temperature 60℃, injection pressure 100 MPa and injection speed 100 mm / s, the spiral flow length of the specimen was measured after injection molding in a spiral-shaped mold with a width of 10 mm and a thickness of 1 mm.

[0102] (4) Vicat softening temperature (unit: ℃): According to ISO 306, the Vicat softening temperature (VST) was measured under conditions of a 5 kg load and a 50℃ / hr heating rate.

[0103]

[0104] Example 1 234567(A) (Weight%) 80502050505050(B) (Weight%) 20508050505050(C) (Parts by weight) 4441.5644(D1) (Parts by weight) 111110.51.5(D2) (Parts by weight)-------(E) (Parts by weight)-------Haze 2.22.22.22.22.22.12.8 Light transmittance 89.389.389.389.489.289.388.9 Specimen fracture height 68716575615976 Spiral flow length 151153155137165152151VST 128127125132120127127

[0105] * Parts by weight: Parts by weight relative to 100 parts by weight of base resin (A+B)

[0106]

[0107] Comparative Example 1234(A) (Weight%) 5955050(B) (Weight%) 9555050(C) (Parts by weight) 440.511(D1) (Parts by weight) 1111(D2) (Parts by weight) ----(E) (Parts by weight) ---- Haze 5.13.6 2.22.2 Light transmittance 81.28 2.98 9.38 9.3 Specimen fracture height 80 32.57 810 Spiral flow length 158 150 125 210 VST 124 129 140 98

[0108] * Parts by weight: Parts by weight relative to 100 parts by weight of base resin (A+B)

[0109]

[0110] Comparative Example 5678(A) (Weight%) 50.50.50.50(B) (Weight%) 50.50.50.50(C) (Parts by weight) -444(D1) (Parts by weight) 10.013-(D2) (Parts by weight) -1(E) (Parts by weight) 4--- Haze 2.32.132.093.5 Light transmittance 89.289.579.255.4 Specimen fracture height 17.522.55565 Spiral flow length 150152150151VST 130127126127

[0111] * Parts by weight: Parts by weight relative to 100 parts by weight of base resin (A+B)

[0112]

[0113] From the above results, it can be seen that the polycarbonate resin composition according to the present invention exhibits excellent transparency (haze, light transmittance), chemical resistance (specimen fracture height), fluidity (spiral flow length), thermal stability (Vicat softening temperature (VST)), and the balance of these physical properties.

[0114] On the other hand, in Comparative Example 1, where the content of polycarbonate resin is less than the range of the present invention and the content of polysiloxane-polycarbonate copolymer resin exceeds the range of the present invention, it can be seen that transparency, etc. is reduced; in Comparative Example 2, where the content of polycarbonate resin exceeds the range of the present invention and the content of polysiloxane-polycarbonate copolymer resin is less than the range of the present invention, it can be seen that transparency, chemical resistance, etc. are reduced. In Comparative Example 3, where the content of diphenylamine-based compound is less than the range of the present invention, it can be seen that fluidity, etc. is reduced; in Comparative Example 4, where the content of diphenylamine-based compound exceeds the range of the present invention, it can be seen that chemical resistance, thermal stability, injection moldability, etc. are reduced; and in Comparative Example 5, where a phosphorus-based compound (E) is applied instead of the diphenylamine-based compound of the present invention, it can be seen that chemical resistance, etc. is reduced. In addition, in Comparative Example 6, the content of polydimethylsiloxane having terminal reactive groups is less than the range of the present invention, it can be seen that chemical resistance, etc. is reduced, and in Comparative Example 7, the content of polydimethylsiloxane having terminal reactive groups exceeds the range of the present invention, it can be seen that transparency, etc. is reduced, and in Comparative Example 8, polydimethylsiloxane (D2) is applied instead of polydimethylsiloxane having terminal reactive groups of the present invention, it can be seen that transparency, etc. is reduced.

[0115]

[0116] The present invention has been described above with reference to embodiments. Those skilled in the art will understand that the present invention may be embodied in modified forms without departing from the essential characteristics of the invention. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the invention is defined by the claims, not by the foregoing description, and all variations within the scope of equivalents should be interpreted as being included in the invention.

Claims

1. About 100 parts by weight of a base resin comprising about 10 to about 90 weight% of a polycarbonate resin and about 10 to about 90 weight% of a polysiloxane-polycarbonate copolymer resin; About 1 to about 10 parts by weight of a diphenylamine-based compound; and A polycarbonate resin composition characterized by comprising about 0.1 to about 2 parts by weight of a polydimethylsiloxane having terminal reactive groups, having a kinematic viscosity of about 5 to about 200 cSt measured at 40°C according to ASTM D445.

2. A polycarbonate resin composition according to claim 1, characterized in that the polycarbonate resin has a weight-average molecular weight of about 10,000 to about 200,000 g / mol as measured by GPC (gel permeation chromatography).

3. A polycarbonate resin composition according to claim 1 or 2, characterized in that the polycarbonate-polysiloxane copolymer resin comprises about 70 to about 99 weight% of a polycarbonate block and about 1 to about 30 weight% of a polysiloxane block.

4. A polycarbonate resin composition according to any one of claims 1 to 3, characterized in that the polycarbonate-polysiloxane copolymer resin has a weight-average molecular weight of about 10,000 to about 50,000 g / mol as measured by gel permeation chromatography (GPC).

5. A polycarbonate resin composition according to any one of claims 1 to 4, wherein the diphenylamine-based compound comprises one or more of 4,4'-bis(α,α-dimethylbenzyl)diphenylamine, phenylnaphthylamine, 4,4'-dimethoxydiphenylamine, and 4-isopropoxydiphenylamine.

6. A polycarbonate resin composition according to any one of claims 1 to 5, characterized in that the terminal reactive group of the polydimethylsiloxane having the terminal reactive group comprises one or more of a hydroxyl group, an epoxy group, and a maleic anhydride group.

7. A polycarbonate resin composition characterized in that, in any one of claims 1 to 6, the weight ratio of the polysiloxane-polycarbonate copolymer resin and the diphenylamine-based compound is about 1:0.02 to about 1:0.

4.

8. A polycarbonate resin composition according to any one of claims 1 to 7, characterized in that the weight ratio of the polysiloxane-polycarbonate copolymer resin and the polydimethylsiloxane having terminal reactive groups is about 1:0.005 to about 1:0.

1.

9. A polycarbonate resin composition characterized in that, in any one of claims 1 to 8, the weight ratio of the diphenylamine-based compound and the polydimethylsiloxane having terminal reactive groups is about 1:0.05 to about 1:

1.

10. A polycarbonate resin composition according to any one of claims 1 to 9, characterized in that the polycarbonate resin composition has a haze of about 3% or less and a light transmittance of about 86% or more of a 1 mm thick specimen measured according to ASTM D1003.

11. A polycarbonate resin composition according to any one of claims 1 to 10, wherein the height at which a specimen is destroyed, measured by impacting a specimen with a thickness of 2 mm with a drop weight evaluation device using a Dupont drop test method with a weight of 2 kg, is about 55 cm or more.

12. A polycarbonate resin composition according to any one of claims 1 to 11, wherein the spiral flow length of a specimen measured after injection molding in a spiral-shaped mold with a width of 10 mm and a thickness of 1 mm is about 130 to about 200 mm under conditions of a molding temperature of 320°C, a mold temperature of 60°C, an injection pressure of 100 MPa, and an injection speed of 100 mm / s.

13. A polycarbonate resin composition according to any one of claims 1 to 12, characterized in that the polycarbonate resin composition has a Vicat softening temperature (VST) of about 110 to about 135°C as measured under a 5 kg load and a 50°C / hr heating condition in accordance with ISO 306.

14. A molded article formed from a polycarbonate resin composition according to any one of claims 1 to 13.

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