Aromatic polycarbonate resin composition and molded article thereof

Abstract

To provide an aromatic polycarbonate resin composition which is excellent in drawdown property and Charpy impact strength, and a molded article of the same.SOLUTION: An aromatic polycarbonate resin composition is obtained by blending 10-90 pts.wt. of a linear aromatic polycarbonate resin (A) having a viscosity average molecular weight of 20,000-40,000, and 90-10 pts.wt. of a branched aromatic polycarbonate resin (B) having a viscosity average molecular weight of 15,000-30,000.SELECTED DRAWING: None

Description

[Technical Field]

[0001] This invention relates to an aromatic polycarbonate resin composition and its molded articles, which exhibit excellent drawdown properties and Charpy impact strength. [Background technology]

[0002] Linear aromatic polycarbonate resins, manufactured from bisphenol A and the like, are excellent in transparency, heat resistance, and mechanical properties, and are used in a wide range of applications. However, when these linear aromatic polycarbonate resins are used in applications such as extrusion molding, blow molding, injection molding, and vacuum molding, the low melt tension can result in uneven thickness or drawdown in the molded product, making it difficult to obtain a satisfactory product. As a solution to this problem, a method has been disclosed in which branched aromatic polycarbonate resins obtained by adding a branching agent having three or more functional groups during polymerization are used (Patent Document 1). However, the branched aromatic polycarbonate resin obtained by this method had the drawback of reduced impact strength. Furthermore, with linear aromatic polycarbonates, there was a problem in that increasing the molecular weight to improve drawdown properties resulted in a decrease in Charpy impact strength. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Patent No. 5740310 [Overview of the project] [Problems that the invention aims to solve]

[0004] The present invention aims to provide an aromatic polycarbonate resin composition and a molded article thereof that exhibits excellent drawdown properties and excellent Charpy impact strength. [Means for solving the problem]

[0005] The inventors conducted diligent research to solve the aforementioned problems and discovered that by blending a linear aromatic polycarbonate resin having a specific molecular weight range with a branched aromatic polycarbonate resin having a specific molecular weight range in a specific ratio, it is possible to improve Charpy impact strength while maintaining low melt viscosity, thus completing the present invention. In other words, the present invention provides the following configurations (1) to (4).

[0006] (Composition 1) An aromatic polycarbonate resin composition obtained by blending 10 to 90 parts by weight of a linear aromatic polycarbonate resin (A) with a viscosity-average molecular weight of 20,000 to 40,000 and 90 to 10 parts by weight of a branched aromatic polycarbonate resin (B) with a viscosity-average molecular weight of 15,000 to 30,000. (Configuration 2) The aromatic polycarbonate resin composition according to configuration 1, wherein the branching agent of the branched aromatic polycarbonate resin (B) is 1,1,1-tris(4-hydroxyphenyl)ethane, and the branching agent content is 0.50 mol% or more and 1.50 mol% or less. (Composition 3) The MVR measured at 300℃ with a load of 1.2kgf (×9.8N) was 2.5cm. 3 An aromatic polycarbonate resin composition according to composition 1 or 2, wherein the duration is 10 min or less. (Composition 4) Charpy impact strength is 67 kJ / m 2 An aromatic polycarbonate resin composition according to any of the above configurations 1 to 3. (Composition 5) A molded article formed from an aromatic polycarbonate resin composition as described in any of the compositions 1 to 4. [Effects of the Invention]

[0007] The aromatic polycarbonate resin composition of the present invention exhibits excellent drawdown properties and Charpy impact strength, allowing it to be molded into products using conventionally known methods such as extrusion molding, blow molding, injection molding, and vacuum molding. It is widely useful in various fields, including housing equipment, building materials, consumer goods, infrastructure equipment, automobiles, office automation / entertainment equipment, and other applications. [Modes for carrying out the invention]

[0008] The present invention will be described in detail below. <Linear aromatic polycarbonate resin (A)> The linear aromatic polycarbonate resin used in this invention is an aromatic polycarbonate resin obtained by reacting a divalent phenol with a carbonate precursor.

[0009] Specific examples of the dihydric phenol used herein include, for example, bis(hydroxyaryl)alkanes such as 2,2-bis(4-hydroxyphenyl)propane (commonly known as bisphenol A), bis(4-hydroxyphenyl)methane, 1,1-bis(4-hydroxyphenyl)ethane, 2,2-bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)octane, 2,2-bis(4-hydroxyphenyl)phenylmethane, 2,2-bis(4-hydroxy-3-methylphenyl)propane, 1,1-bis(4-hydroxy-3-tert-butylphenyl)propane, 2,2-bis(4-hydroxy-3-bromophenyl)propane, 2,2-bis(4-hydroxy-3,5-dibromophenyl)propane, and 2,2-bis(4-hydroxy-3,5-dichlorophenyl)propane; bis(hydroxyphenyl)cycloalkanes such as 1,1-bis(hydroxyphenyl)cyclopentane and 1,1-bis(hydroxyphenyl)cyclohexane; dihydroxyaryl ethers such as 4,4'-dihydroxydiphenyl ether and 4,4'-dihydroxy-3,3'-dimethyldiphenyl ether; dihydroxydiaryl sulfides such as 4,4'-dihydroxydiphenyl sulfide and 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfide; dihydroxydiaryl sulfoxides such as 4,4'-dihydroxydiphenyl sulfoxide and 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfoxide; and dihydroxydiaryl sulfones such as 4,4'-dihydroxydiphenyl sulfone and 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfone.

[0010] These dihydric phenols may be used alone or in combination of two or more thereof. Among the aforementioned dihydric phenols, it is preferable that 2,2-bis(4-hydroxyphenyl)propane (bisphenol A) is the main dihydric phenol component, and it is particularly preferable that bisphenol A accounts for 70 mol% or more, more preferably 80 mol% or more, of the total dihydric phenol components. Most preferable is a linear aromatic polycarbonate resin in which the dihydric phenol component is substantially bisphenol A.

[0011] A brief description is given of the basic means for producing a linear aromatic polycarbonate resin. In the solution method using phosgene as a carbonate precursor, a reaction between a dihydric phenol component and phosgene is generally carried out in the presence of an acid binder and an organic solvent. As the acid binder, for example, an alkali metal hydroxide such as sodium hydroxide or potassium hydroxide, or an amine compound such as pyridine is used. As the organic solvent, for example, a halogenated hydrocarbon such as methylene chloride or chlorobenzene is used. To promote the reaction, a catalyst such as a tertiary amine or a quaternary ammonium salt can be used, and it is preferable to use an end terminator such as phenol or an alkyl-substituted phenol such as p-tert-butylphenol as a molecular weight modifier. The reaction temperature is generally 0 to 40°C, the reaction time is several minutes to 5 hours, and it is preferable to maintain the pH during the reaction at 10 or higher.

[0012] The transesterification method (melting method) using a carbonic acid diester as a carbonate precursor is a method in which a predetermined ratio of a dihydric phenol component and a carbonic acid diester are stirred while heating in the presence of an inert gas, and the produced alcohol or phenols are distilled off. The reaction temperature varies depending on the boiling point of the produced alcohol or phenols and the like, but is generally in the range of 120 to 300°C. The reaction is carried out while reducing the pressure from the initial stage to distill off the produced alcohol or phenols. A common transesterification catalyst can be used to promote the reaction. Examples of the carbonic acid diester used in this transesterification reaction include diphenyl carbonate, dinaphthyl carbonate, dimethyl carbonate, diethyl carbonate, dibutyl carbonate and the like, and diphenyl carbonate is particularly preferable.

[0013] The molecular weight of the linear aromatic polycarbonate resin used in the present invention, expressed as a viscosity-average molecular weight, is 20,000 to 40,000, preferably 23,000 to 39,000, more preferably 25,000 to 38,500, still more preferably 28,000 to 38,000, and particularly preferably 35,000 to 37,500. When the molecular weight is within the above range, an aromatic polycarbonate resin composition obtained by blending the linear aromatic polycarbonate resin with a branched aromatic polycarbonate resin is excellent in drawdown properties and Charpy impact strength.

[0014] The viscosity-average molecular weight of the linear aromatic polycarbonate resin is determined by first obtaining the specific viscosity (η SP ) calculated by the following formula using an Ostwald viscometer from a solution prepared by dissolving 0.7 g of the linear aromatic polycarbonate resin material in 100 mL of methylene chloride at 20°C, specific viscosity (η SP )=(t-t0) / t0 [t0 is the falling time in seconds of methylene chloride, and t is the falling time in seconds of the sample solution] The viscosity-average molecular weight Mv is calculated from the obtained specific viscosity (η SP ) according to the following mathematical formula. η SP / c=[η]+0.45×[η] 2 c (where [η] is the intrinsic viscosity) [η]=1.23×10 -4 Mv 0.83 c=0.7

[0015] <Branched aromatic polycarbonate resin (B)> The branched aromatic polycarbonate resin used in the present invention is an aromatic polycarbonate resin obtained by reacting a dihydric phenol, a branching agent, and a carbonate precursor. Specific examples of the dihydric phenol used herein include the same dihydric phenols as those used in the linear aromatic polycarbonate resin described above. The basic method for producing the branched aromatic polycarbonate resin is the same as the method for producing the linear aromatic polycarbonate resin described above, except that a branching agent is used.

[0016] (Branching agent) The branching agent used in the present invention is preferably 1,1,1-tris(4-hydroxyphenyl)ethane. The branching agent can be used as a solid and / or molten material, or as a solid and / or molten material dissolved in an alkaline aqueous solution or organic solvent.

[0017] (Branching agent content) The branching agent content in the branched aromatic polycarbonate resin is preferably 0.50 mol% to 1.50 mol%, more preferably 0.60 mol% to 1.45 mol%, and even more preferably 0.70 mol% to 1.40 mol%. The branching agent content refers to the number of moles of branching agent relative to the total number of moles of divalent phenolic compounds (expressed as moles of branching agent / total number of moles of divalent phenolic compounds × 100 mol%). A branching agent content within the above range is preferable because it is less likely to cause drawdown, the branched aromatic polycarbonate resin is less likely to crosslink, no gel is generated, satisfactory branching characteristics are obtained, and it also exhibits excellent impact resistance and transparency.

[0018] The molecular weight of the branched aromatic polycarbonate resin used in the present invention is 15,000 to 30,000, expressed as viscosity-average molecular weight, preferably 17,000 to 29,000, more preferably 18,000 to 28,000, even more preferably 19,000 to 27,000, and particularly preferably 20,000 to 26,000. Within this range, the aromatic polycarbonate resin composition blended with the linear aromatic polycarbonate resin exhibits excellent drawdown properties and Charpy impact strength.

[0019] The viscosity-average molecular weight of branched aromatic polycarbonate resin is measured using the same method as described above for measuring the viscosity-average molecular weight of linear aromatic polycarbonate resin.

[0020] <Aromatic polycarbonate resin composition> The aromatic polycarbonate resin composition of the present invention is an aromatic polycarbonate resin composition obtained by blending 10 to 90 parts by weight of the linear aromatic polycarbonate resin (A) and 90 to 10 parts by weight of the branched aromatic polycarbonate resin (B) described above. The parts by weight of the linear aromatic polycarbonate resin (A) and the branched aromatic polycarbonate resin (B) refer to parts by weight relative to 100 parts by weight of the total amount of aromatic polycarbonate resin (A) and branched aromatic polycarbonate resin (B).

[0021] The blend ratio of linear aromatic polycarbonate resin (A) to branched aromatic polycarbonate resin (B) is preferably aromatic polycarbonate resin (A) / branched aromatic polycarbonate resin (B) = 15~85 / 85~15 (parts by weight), more preferably 20~80 / 80~20 (parts by weight), and even more preferably 25~75 / 75~25 (parts by weight). Aromatic polycarbonate resin compositions within the above range exhibit excellent drawdown properties and Charpy impact strength.

[0022] (MVR) The aromatic polycarbonate resin composition of the present invention has an MVR of 2.5 cm² measured at 300°C and a load of 1.2 kgf (×9.8 N). 3 It is preferable that the interval be 10 min or less, and 2.3 cm 3 It is more preferable that the interval be 10 min or less, and 2.1 cm 3 It is even more preferable that the interval be 10 min or less, and 2.0 cm 3 It is particularly preferable that the interval be 10 min or less, and 1.9 cm 3 A minimum of 10 min is most preferable. Within this range, excellent drawdown performance is achieved. If the MVR is too small, moldability is poor, so 0.5 cm is recommended. 3 A duration of 10 minutes or more is preferable.

[0023] (Impact strength) The aromatic polycarbonate resin composition of the present invention has a Charpy impact strength of 67 kJ / m² as measured in accordance with ISO 179. 2 Preferably, it is 70kJ / m³ or more. 2It is more preferable that it be 75 kJ / m³ or higher. 2 It is even more preferable that the value be greater than or equal to 80kJ / m³. 2 It is particularly preferable that the values ​​are above this range. Within the above range, impact resistance is excellent. The Charpy impact strength is 100 kJ / m². 2 It can perform optimally in the following situations.

[0024] (Additives) The aromatic polycarbonate resin composition of the present invention may be further modified and improved by adding antioxidants, mold release agents (such as fatty acid esters), weathering agents (ultraviolet absorbers), nucleating agents, lubricants, plasticizers, antistatic agents, whitening agents, antibacterial agents, colorants (pigments, dyes, etc.), fillers, reinforcing agents, polymers such as other resins and rubbers, flame retardants, etc., as appropriate, within limits that do not impair the properties of the present invention. When used as a building material in the sheet field, it is desirable to incorporate a weathering agent. Furthermore, when used as a foamed sheet, it is desirable to incorporate a nucleating agent. In addition, the aromatic polycarbonate resin composition of the present invention has excellent transparency, impact resistance, and drawdown properties, making it suitable for a variety of applications. Specifically, it is suitable for molding processes such as injection molding, extrusion molding, and blow molding. Examples of such applications include light guide plates, prism sheets, and electrical and electronic components such as lighting equipment.

[0025] (UV absorber) An ultraviolet absorber can be used in the aromatic polycarbonate resin composition of the present invention. Examples of ultraviolet absorbers include benzophenone-based ultraviolet absorbers such as 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone, 2-hydroxy-4-n-dodecyloxybenzophenone, 2-hydroxy-4-bendyloxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-2'-carboxybenzophenone, 2-hydroxy-4-methoxy-5-sulfoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxy-5-sodium sulfoxybenzophenone, and bis(5-benzoyl-4-hydroxy-2-methoxyphenyl)methane.

[0026] Examples of UV absorbers include 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-5'-tert-butylphenyl)benzotriazole, 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di-tert-amylphenyl)benzotriazole, 2-(2'-hydroxy-3'-dodecyl-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-bis(α,α'-dimethylbenzyl)phenylbenzotriazole, 2-[2'-hydroxy-3'- Examples of benzotriazole-based ultraviolet absorbers include (3",4",5",6"-tetraphthalimidomethyl)-5'-methylphenyl]benzotriazole, 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 2,2'methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-(2H-benzotriazole-2-yl)phenol], and methyl-3-[3-tert-butyl-5-(2H-benzotriazole-2-yl)-4-hydroxyphenylpropionate-polyethylene glycol condensates.

[0027] Furthermore, examples of UV absorbers include hydroxyphenyltriazine compounds such as 2-(4,6-diphenyl-1,3,5-triazine-2-yl)-5-hexyloxyphenol and 2-(4,6-bis-(2,4-dimethylphenyl-1,3,5-triazine-2-yl)-5-hexyloxyphenol, as well as malonic acid ester compounds such as 2-(1-arylalkylidene)malonic acid esters, such as Hostavin PR-25 and Hostavin B-CAP manufactured by Clariant Japan.

[0028] The amount of ultraviolet absorber is preferably 0.01 to 5 parts by weight, more preferably 0.02 to 1 part by weight, even more preferably 0.05 to 0.5 parts by weight, and particularly preferably 0.1 to 0.3 parts by weight, per 100 parts by weight of the aromatic polycarbonate resin composition.

[0029] (Heat stabilizer) A heat stabilizer may be used in the aromatic polycarbonate resin composition of the present invention. Phosphorus-based heat stabilizers and hindered phenol-based heat stabilizers can be used as heat stabilizers.

[0030] As a phosphorus-based heat stabilizer, a phosphite ester-based heat stabilizer is preferred. Examples of phosphite ester-based heat stabilizers include tris(nonylphenyl) phosphite, triphenyl phosphite, tris(2,4-di-tert-butylphenyl) phosphite, tetrakis(2,4-di-tert-butylphenyl)-4,4'-biphenylenediphosphonite, bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol-di-phosphite, bis(2,4-di-tert-butylphenyl)pentaerythritol-di-phosphite, and 2,2'-methylenebis(4,6-di-tert-butyl Phenyl)2-ethylhexyl-phosphite, tris(ethylphenyl)phosphite, tris(butylphenyl)phosphite, and tris(hydroxyphenyl)phosphite are preferred, and tris(nonylphenyl)phosphite, tris(2,4-di-tert-butylphenyl)phosphite, 2,2'-methylenebis(4,6-di-tert-butylphenyl)2-ethylhexyl-phosphite, and tetrakis(2,4-di-tert-butylphenyl)-4,4'-biphenylenediphosphonite are particularly preferred.

[0031] The amount of phosphorus-based heat stabilizer added is preferably 0.001 to 0.5 parts by weight, more preferably 0.005 to 0.3 parts by weight, and even more preferably 0.01 to 0.2 parts by weight, per 100 parts by weight of the aromatic polycarbonate resin composition.

[0032] Examples of hindered phenol-based heat stabilizers include pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], thiodiethylene bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, benzenepropanoate 3,5-bis(1,1-dimethylethyl)-4-hydroxyalkyl ester (alkyl has side chains with 7-9 carbon atoms), 2,4-dimethyl-6-(1-methylpentadecyl)phenol, and 3,3',3”,5,5',5”-hexa-tert-butyl-a,a',a”-(mesitylene-2,4,6 Examples include triyl)tri-p-cresol, ethylenebis(oxyethylene)bis[3-(5-tert-butyl-4-hydroxy-m-tolyl)propionate], hexamethylenebis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], and 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione. Among these, pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate are preferred.

[0033] The amount of hindered phenol-based heat stabilizer added is preferably in the range of 0.001 to 0.5 parts by weight, more preferably in the range of 0.005 to 0.3 parts by weight, and even more preferably in the range of 0.01 to 0.2 parts by weight, per 100 parts by weight of the aromatic polycarbonate resin composition.

[0034] The total amount of heat stabilizers blended is preferably in the range of 0.001 to 0.5 parts by weight, more preferably in the range of 0.005 to 0.4 parts by weight, and even more preferably in the range of 0.01 to 0.3 parts by weight, per 100 parts by weight of the aromatic polycarbonate resin composition.

[0035] <Release agent> A mold release agent may be added to the aromatic polycarbonate resin composition of the present invention. As the mold release agent, saturated fatty acid esters are preferred, and examples include monoglycerides such as monoglyceride stearate, lower fatty acid esters such as stearate stearate, higher fatty acid esters such as behenate sebacate, and erythritol esters such as pentaerythritol tetrastearate.

[0036] The amount of release agent added is preferably in the range of 0.05 to 0.5 parts by weight, more preferably in the range of 0.1 to 0.4 parts by weight, and even more preferably in the range of 0.12 to 0.3 parts by weight, per 100 parts by weight of the aromatic polycarbonate resin composition.

[0037] <Bluing agent> The aromatic polycarbonate resin composition of the present invention may contain a bluing agent to counteract the yellowing of lenses based on the aromatic polycarbonate resin and ultraviolet absorbers. Any bluing agent used with aromatic polycarbonate resins can be used without any particular problems. Generally, anthraquinone dyes are readily available and preferred.

[0038] Specific bluing agents include, for example, Solvent Violet 13 (generic name: 60725; trademark name: "Macrolex Violet B" manufactured by Bayer, "Diarezin Blue G" manufactured by Mitsubishi Chemical Corporation, "Sumiplast Violet B" manufactured by Sumitomo Chemical Co., Ltd.), Solvent Violet 31 (generic name: 68210; trademark name: "Diarezin Violet D" manufactured by Mitsubishi Chemical Corporation), Solvent Violet 33 (generic name: 60725; trademark name: "Diarezin Blue J" manufactured by Mitsubishi Chemical Corporation), Solvent Blue 94 (generic name: 61500; trademark name: "Diarezin Blue N" manufactured by Mitsubishi Chemical Corporation), Solvent Violet 36 (generic name: 68210; trademark name: "Macrolex Violet 3R" manufactured by Bayer), and Solvent Blue97 [trademark name: Macrolex Blue RR, manufactured by Bayer AG] and SolventBlue 45 [CA. No. 61110; trademark name: Tetrazole Blue RLS, manufactured by Sandoz] are typical examples. These bluing agents are usually incorporated into aromatic polycarbonate resin compositions at concentrations of 0.3 to 5.0 ppm. If too much bluing agent is incorporated, the absorption of the bluing agent increases, reducing the visible transmittance.

[0039] The amount of bluing agent added is preferably 0.00001 to 0.0001 parts by weight, and more preferably 0.000015 to 0.00005 parts by weight, per 100 parts by weight of the aromatic polycarbonate resin composition. Within this range, it is preferable because it is effective in suppressing yellowing and results in a good appearance of the molded product.

[0040] <Molded products> Any method can be used to produce a molded article formed from the polycarbonate resin composition of the present invention. For example, the polycarbonate resin composition can be kneaded in an extruder, Banbury mixer, or roll, and then molded by conventionally known methods such as extrusion molding, blow molding, injection molding, or vacuum molding to obtain a molded article.

[0041] Specific applications of the molded products include, for example, housing equipment, building materials, consumer goods, infrastructure equipment, automobiles, office automation / enterprise equipment, and a wide range of other fields. They are particularly useful as electrical and electronic components such as light guide plates, prism sheets, and lighting equipment. [Examples]

[0042] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the following examples unless it exceeds the essence of the invention. The raw materials used in the following examples and comparative examples are as follows:

[0043] (Linear aromatic polycarbonate resin (A)) Teijin Limited's Panlite C-1400WP (viscosity-average molecular weight 37,500) Teijin Limited's Panlite K-1300WP (viscosity-average molecular weight 30,000) Teijin Limited's Panlite L-1250WQ (viscosity-average molecular weight 25,100) Teijin Limited's Panlite L-1250WX (viscosity-average molecular weight 19,700) Teijin Limited's Panlite CM-1000 (viscosity-average molecular weight 15,200) (Branched aromatic polycarbonate resin (B)) Teijin Limited's Panlite L-1250WB (viscosity-average molecular weight 25,000; branching agent is 1,1,1-tris(4-hydroxyphenyl)ethane, with a branching agent content of 1.0 mol%). Teijin Limited's Panlite L-1225WB (viscosity-average molecular weight 20,000; branching agent is 1,1,1-tris(4-hydroxyphenyl)ethane, with a branching agent content of 1.0 mol%).

[0044] (1) Charpy impact strength From the obtained pellets, bending test specimens with a width of 10 mm, a length of 80 mm, and a thickness of 4 mm were formed using a J180ADS injection molding machine manufactured by Japan Steel Works Ltd., at a cylinder temperature of 280 to 350°C and a mold temperature of 70 to 90°C, and measured in accordance with ISO 179. A higher Charpy impact strength is preferable.

[0045] (2) The viscosity-average molecular weight (Mv) was measured by the following method. The specific viscosity (η) was determined from a solution prepared by dissolving 0.7 g of the obtained pellet in 100 ml of methylene chloride at 20°C, using an Ostwald viscometer. SP The viscosity-average molecular weight Mv was calculated from the following formula. Specific viscosity (η SP ) = (t-t0) / t0 [t0 is the number of seconds for the methylene chloride to fall, and t is the number of seconds for the sample solution to fall.] η SP / c=[η]+0.45×[η] 2 c (where [η] is the intrinsic viscosity) [η] = 1.23 × 10 -4 Mv 0.83 c = 0.7

[0046] (3) Melt Volume Rate (MVR) The obtained pellets were dried at 120°C for 4 hours in a hot air circulating dryer, and the melt volume flow rate (MVR) was measured in accordance with ISO 1133 using a semi-automatic melt indexer [3A, manufactured by Toyo Seiki Seisakusho Co., Ltd.].

[0047] [Examples 1-18 and Comparative Examples 1-19] After blending the raw material powders in the proportions shown in Tables 1 to 10, the mixture was melt-kneaded at a cylinder temperature of 280 to 320°C using a vented twin-screw extruder TEX30α manufactured by Japan Steel Works Ltd. with a screw diameter of 30 mm, and then pelletized by strand cutting. After drying the pellets at 120°C for 5 hours, evaluation test pieces were formed under the above conditions, and the evaluation was performed as described above. The evaluation results are shown in Tables 1 to 10.

[0048] [Table 1]

[0049] [Table 2]

[0050] [Table 3]

[0051] [Table 4]

[0052] [Table 5]

[0053] [Table 6]

[0054] [Table 7]

[0055] [Table 8]

[0056] [Table 9]

[0057] [Table 10] [Industrial applicability]

[0058] The aromatic polycarbonate resin composition of the present invention exhibits excellent drawdown properties and Charpy impact strength, making it widely useful in various fields such as housing equipment, building materials, consumer goods, infrastructure equipment, automobiles, office automation / entertainment equipment, and other applications.

Claims

1. An aromatic polycarbonate resin composition obtained by blending 10 to 90 parts by weight of a linear aromatic polycarbonate resin (A) obtained by reacting 2,2-bis(4-hydroxyphenyl)propane having a viscosity-average molecular weight of 28,000 to 40,000 with a carbonate precursor, and 90 to 10 parts by weight of a branched aromatic polycarbonate resin (B) having a viscosity-average molecular weight of 15,000 to 30,000 and a branching agent content of 0.50 mol% to 1.50 mol%, obtained by reacting 2,2-bis(4-hydroxyphenyl)propane, 1,1,1-tris(4-hydroxyphenyl)ethane, and a carbonate precursor.

2. The MVR measured at 300°C with a load of 1.2 kgf (×9.8 N) was 2.5 cm. ３ The aromatic polycarbonate resin composition according to claim 1, wherein the length is 10 min or less.

3. Charpy impact strength is 67 kJ / m ２ The aromatic polycarbonate resin composition according to claim 1, as described above.

4. A molded article formed from the aromatic polycarbonate resin composition described in claim 1.

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