JP2005082724A - Polycarbonate resin composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polycarbonate resin composition having metallic appearance and excellent impact strength, heat-resistance and flame-retardance. <P>SOLUTION: The polycarbonate resin composition contains (a) 100 pts. wt. of an aromatic polycarbonate resin, (b) 0.5-40 pts. wt. of a phosphorus-based flame-retardant, (c) 0.01-5 pts. wt. of a polyfluoroethylene resin, (d) 0.5-30 pts. wt. of a multi-layer structure polymer composed of a polymer containing an alkyl (meth)acrylate polymer and (e) 0.05-5 pts. wt. of metal particles wherein the content of thermoplastic resins other than the components (a), (c) and (d) is ≤5 wt.% based on the sum of the thermoplastic resins and the aromatic polycarbonate resin (a). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a polycarbonate resin composition, and more particularly to a polycarbonate resin composition having a metallic appearance and excellent impact resistance, heat resistance, and flame retardancy.

  Polycarbonate resins have excellent mechanical properties, electrical properties, and heat resistance, and are used in a wide range of fields such as automobiles, office automation equipment, electrical / electronic parts, building materials, and household goods. When a polycarbonate resin is used as a metal substitute material, a polycarbonate resin composition having a metallic tone is often used. For example, Patent Document 1 discloses a specific resin for a thermoplastic resin such as a polycarbonate resin. A composition containing a metallic pigment and a colorant is disclosed. However, in the polycarbonate resin shown in Patent Document 1 or a resin composition in which a specific metallic pigment and a colorant are blended with a polycarbonate resin, the molecular weight of the polycarbonate resin is likely to decrease during melting and kneading, and the impact strength is likely to decrease. There is a problem. Moreover, in the case of the resin composition of patent document 1, there is no specific description about a flame retardance, and use in the use for which a flame retardance is requested | required is restrict | limited. In Patent Document 2, a discontinuous elastomer phase is dispersed in a continuous hard thermoplastic resin such as an ABS resin in a polycarbonate resin, and at least a part of the hard thermoplastic phase is chemically grafted to the elastomer phase. A thermoplastic resin composition having a metallic appearance by blending a rubber-modified graft copolymer, a thermoplastic polymer such as an AS resin, a phosphorus-containing flame retardant compound, and metal particles is disclosed. In the case of the thermoplastic resin composition disclosed in Patent Document 2, although the problems of flame retardancy and impact resistance are solved, the heat resistance such as load deflection temperature is reduced by the blending of the ABS resin and the AS resin. A new problem has occurred.

JP 2001-261978 A Japanese translation of PCT publication No. 2002-521547

  An object of the present invention is to provide a polycarbonate resin composition having a metallic appearance and excellent in impact resistance, heat resistance and flame retardancy.

  The present invention has been made in order to solve the above-mentioned problems. The gist of the present invention is (a) 100 parts by weight of an aromatic polycarbonate resin, (b) 0.5 to 40 parts by weight of a phosphorus-based flame retardant, ( c) 0.01 to 5 parts by weight of a polyfluoroethylene resin, (d) 0.5 to 30 parts by weight of a multi-layer structure polymer containing an alkyl (meth) acrylate polymer as a constituent component, and (e) 0. The content of the thermoplastic resin other than the above (a), (c) and (d) is 5% by weight based on the total amount with the weight of the (a) aromatic polycarbonate resin. It exists in the polycarbonate resin composition which is the following.

Hereinafter, the present invention will be described in detail. The (a) aromatic polycarbonate resin used in the present invention is an optionally branched thermoplastic aromatic obtained by reacting an aromatic hydroxy compound or a small amount thereof with a diester of phosgene or carbonic acid. Polycarbonate polymer or copolymer.
As the raw material aromatic dihydroxy compound, 2,2-bis (4-hydroxyphenyl) propane (= bisphenol A), tetramethylbisphenol A, bis (4-hydroxyphenyl) -p-diisopropylbenzene, hydroquinone, resorcinol, 4 , 4-dihydroxydiphenyl and the like, preferably bisphenol A.

  In order to obtain a branched aromatic polycarbonate resin, phloroglucin, 4,6-dimethyl-2,4,6-tris (4-hydroxyphenyl) heptene-2, 4,6-dimethyl-2,4,6-tris ( 4-hydroxyphenyl) heptane, 2,6-dimethyl-2,4,6-tris (4-hydroxyphenylheptene-3,1,3,5-tris (4-hydroxyphenyl) benzene, 1,1,1 A polyhydroxy compound represented by tris (4-hydroxyphenyl) ethane or the like, or 3,3-bis (4-hydroxyaryl) oxindole (= isatin bisphenol), 5-chloruisatin, 5,7-dichloroisatin, 5- Bromoisatin or the like may be used as a part of the aromatic dihydroxy compound, and the amount used is 0.01 to 10 mol. A%, preferably 0.1 to 2 mol%.

To adjust the molecular weight of the polycarbonate resin, monovalent aromatic hydroxy compounds may be used, m- and p-methylphenol, m- and p-propylphenol, p-tert-butylphenol and p-long chain alkyl-substituted phenol. Etc. The aromatic polycarbonate resin used in the present invention is preferably a polycarbonate resin derived from 2,2-bis (4-hydroxyphenyl) propane, or 2,2-bis (4-hydroxyphenyl) propane and others. Polycarbonate copolymers derived from the above aromatic dihydroxy compounds. As the aromatic polycarbonate resin, two or more kinds of resins may be mixed and used.
The molecular weight of the aromatic polycarbonate resin is 16,000 to 30,000, preferably 18,000 to 23, in terms of viscosity average molecular weight converted from the solution viscosity measured at a temperature of 25 ° C. using methylene chloride as a solvent. 000.

  The (b) phosphorus-based flame retardant used in the present invention is a compound known as a flame retardant for a resin having a phosphorus atom in the molecule, and preferably represented by the following general formula (1) or (2). And phosphoric acid ester compounds.

(Wherein R ¹ , R ² and R ³ each represents an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 20 carbon atoms which may be substituted with an alkyl group, h, i and j Each represents 0 or 1).

(Wherein R ⁴ , R ⁵ , R ⁶ and R ⁷ each represents an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 20 carbon atoms which may be substituted with an alkyl group, p, q, r and s are each 0 or 1, m is a number from 1 to 5, and X represents an arylene group).

  Examples of the phosphorus compound represented by the general formula (1) include triphenyl phosphate, tricresyl phosphate, diphenyl 2-ethylcresyl phosphate, tri (isopropylphenyl) phosphate, methylphosphonic acid diphenyl ester, phenylphosphonic acid diethyl ester, and diphenyl phosphate. Examples thereof include zil and tributyl phosphate. The phosphorus compound represented by the general formula (1) can be produced from phosphorus oxychloride or the like by a known method.

  As the phosphorus compound represented by the general formula (2), m is a condensed phosphate ester of 1 to 5, m may be a single condensed phosphate ester, or a mixture of condensed phosphate esters in which m is different. It may be. When it is a mixture, the average value of m of the mixture may be 1 to 5. X represents an arylene group, for example, a group derived from a dihydroxy compound such as resorcinol, hydroquinone, bisphenol A or the like. As the phosphorus compound represented by the general formula (2), for example, when the dihydroxy compound is resorcinol, phenyl resorcin / polyphosphate, cresyl / resorcin / polyphosphate, phenyl / cresyl / resorcin / polyphosphate, xylyl Resorcinol / polyphosphate, phenyl-pt-butylphenyl / resorcin / polyphosphate, phenyl / isopropylphenyl / resorcinol polyphosphate, cresyl / xylyl / resorcin / polyphosphate phenyl / isopropylphenyl / diisopropylphenyl / resorcinol polyphosphate It is done.

  Content of (b) phosphorus flame retardant in this invention composition is 0.5-40 weight part with respect to 100 weight part of (a) aromatic polycarbonate resin. If the content of the phosphorus flame retardant is less than 0.5 parts by weight, the flame retardancy is insufficient, and if it exceeds 40 parts by weight, the mechanical properties are likely to deteriorate. The amount of the phosphorus-based flame retardant is preferably 0.8 to 30 parts by weight, more preferably 1 to 20 parts by weight with respect to 100 parts by weight of the aromatic polycarbonate resin.

  The (c) polyfluoroethylene resin used in the present invention has a function of preventing dripping at the time of combustion, and is preferably polytetrafluoroethylene having a fibril-forming ability, and is easily contained in the polymer. It shows a tendency to disperse and bond polymers together to form a fibrous material. Polytetrafluoroethylene having fibril-forming ability is classified as type 3 according to the ASTM standard. As polytetrafluoroethylene having fibril forming ability, for example, it is commercially available from Mitsui / Dupont Fluorochemical Co., Ltd. as Teflon (R) 6J or Teflon (R) 30J, or from Daikin Chemical Industries, Ltd. as polyflon. . Further, for example, a copolymer or multilayer polymer of polytetrafluoroethylene and a repeating unit derived from a non-fluorinated monoethylenically unsaturated monomer can be used. Suitable non-fluorinated monoethylenically unsaturated monomers include olefin monomers such as ethylene and propylene, and acrylate monomers such as methyl methacrylate and butyl acrylate. An example of such a copolymer is Methbrene A-3800, which is commercially available from Mitsubishi Rayon Co., Ltd.

  Content of (c) polyfluoroethylene resin in this invention composition is 0.01-5 weight part with respect to 100 weight part of (a) aromatic polycarbonate resin. When the amount of the polyfluoroethylene resin is less than 0.01 parts by weight, the flame retardancy is insufficient, and when it exceeds 5 parts by weight, the appearance is liable to deteriorate. The amount of the polyfluoroethylene resin is preferably 0.02 to 4 parts by weight and more preferably 0.03 to 3 parts by weight with respect to 100 parts by weight of the aromatic polycarbonate resin.

  The multilayer structure polymer containing an alkyl (meth) acrylate polymer in the component (d) used in the present invention is, for example, such that the polymer in the previous stage is sequentially coated with the polymer in the subsequent stage. It is a polymer having a core-shell structure produced by continuous multi-stage seed polymerization, and at least a part of the core and the shell is an alkyl (meth) acrylate polymer. The basic polymer structure comprises at least an outermost shell layer made of a polymer compound that improves the adhesion between the inner core layer, which is a crosslinking component having a low glass transition temperature, and the matrix of the composition.

  The multilayer structure polymer containing an alkyl (meth) acrylate polymer is preferably an inner core layer made of a crosslinked rubbery polymer and an outermost shell layer made of a polymer containing an alkyl (meth) acrylate polymer. In addition, for example, the innermost core layer is formed of a polymer made of an aromatic vinyl monomer, and the intermediate layer is formed of a rubbery polymer having a low glass transition temperature. A multilayer structure polymer having an outer shell layer made of an alkyl (meth) acrylate polymer may be mentioned, which brings about an effect of improving appearance defects such as pearly luster. The crosslinked rubbery polymer is a polymer containing a monomer having a glass transition temperature of 0 ° C. or less, specifically, a polymer of butadiene, styrene / butadiene, EPDM, alkyl acrylate or alkyl methacrylate, alone or Two or more types can be copolymerized. Furthermore, what formed the polymer of the state which cannot be isolate | separated by superposing | polymerizing the said monomer in presence of polyalkylsiloxane can also be used conveniently. Moreover, as a monomer that forms the outermost shell layer, alkyl (meth) acrylate monomers, specifically, alkyl methacrylates such as methyl methacrylate, ethyl methacrylate, propyl methacrylate, etc. are preferable, aromatic vinyl compounds such as styrene, Vinyl cyanide compounds such as acrylonitrile and mixtures thereof can also be used.

  The content of the multilayer structure polymer including the (d) alkyl (meth) acrylate polymer in the composition of the present invention is 0.5 to 30 parts by weight with respect to 100 parts by weight of the (a) aromatic polycarbonate resin. . If the content is less than 0.5 parts by weight, the impact strength tends to decrease, and if it exceeds 30 parts by weight, the heat resistance tends to decrease. The amount of the multilayer structure polymer containing the alkyl (meth) acrylate polymer is preferably 1 to 25 parts by weight, more preferably 2 to 20 parts by weight with respect to 100 parts by weight of the aromatic polycarbonate resin.

  The metal particles (e) used in the present invention are not particularly limited as long as they give a metallic appearance to the molded article of the polycarbonate resin composition. Examples of the metal particles include metal powders such as aluminum, iron, gold, silver, zinc, tin, and nickel, and powders such as alloys and compounds such as brass, brass, and stainless steel based on these metals, preferably Aluminum powder. Moreover, the thing which metal-plated to inorganic substances, such as mica, a graphite, and glass flakes, and the thing which coat | covered the metal oxide can be used, and the plating thickness has a preferable thing of 10-1000 nm. Furthermore, a small amount of a processing agent such as a grinding aid or an organic solvent for preventing the explosion of the metal powder may be contained in the metal powder. The shape of the metal powder may be flaky, irregular, spherical, or a mixture thereof. Moreover, the magnitude | size of metal powder is 5-1000 micrometers, Preferably it is 10-500 micrometers, More preferably, it is 20-300 micrometers.

  Content of the (e) metal particle in this invention composition is 0.05-5 weight part with respect to 100 weight part of (a) aromatic polycarbonate resin, Preferably it is 0.1-3 weight part. If the content is less than 0.05 parts by weight, it is difficult to obtain a metallic appearance, and if it exceeds 5 parts by weight, mechanical strength such as impact strength and thermal stability during melting and kneading may be reduced. Therefore, it is not preferable.

  In addition to the components (a) to (e), the polycarbonate resin composition of the present invention includes, as necessary, stabilizers such as ultraviolet absorbers and antioxidants, pigments, dyes, lubricants, other flame retardants, release agents. Additives such as molds, slidability improvers, reinforcing materials such as glass fibers, glass flakes and carbon fibers, whiskers such as potassium titanate and aluminum borate, and resins other than aromatic polycarbonate resins it can.

  Examples of the resin other than the aromatic polycarbonate resin include polyester resins such as polybutylene terephthalate and polyethylene terephthalate, styrenic resins such as polyamide resin, HIPS resin, and ABS resin, and thermoplastic resins such as polyolefin resin. However, when a resin other than the aromatic polycarbonate resin is blended, the blending amount needs to be 5% by weight or less of the total amount of the resin other than the aromatic polycarbonate resin and the aromatic polycarbonate resin. When the addition amount of the resin other than the aromatic polycarbonate resin is 5% by weight or more, the heat resistance of the composition of the present invention is greatly lowered.

  The polycarbonate resin composition of the present invention is preferably free of halogen from the viewpoints of environmental pollution, corrosion problems of molding machines and molds, and the like. Therefore, each of the components (a), (b), (c), (d) and (e) constituting the composition of the present invention does not contain halogen atoms, particularly chlorine and bromine, or can be contained in each component. It is preferred to use as little as possible.

  The method for producing the flame retardant polycarbonate resin composition of the present invention is not particularly limited, and for example, a multilayer structure containing an aromatic polycarbonate resin, a phosphorus flame retardant, a polyfluoroethylene resin, and an alkyl (meth) acrylate polymer. Examples include a method of melt-kneading a polymer and metal powder at once, or a method of previously melting and kneading an aromatic polycarbonate resin and a phosphorus-based flame retardant, a polyfluoroethylene resin and a multilayer structure polymer, and then mixing and kneading the metal powder. It is done.

The polycarbonate resin composition of the present invention is excellent in impact resistance, flame retardancy, heat resistance, and has a metallic appearance, such as various industrial parts, AV products, home appliances, OA equipment, telegraph telephone parts, etc. It is useful for automobile parts such as electrical and electronic parts, door handles, appearance and interior, precision machine parts such as cameras and watches, and leisure goods such as skis and fishing gear.
Example

EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, this invention is not limited to the following examples, unless the summary is exceeded.
In the examples and comparative examples, the following raw materials were used.
(1) Polycarbonate resin: Poly-4,4-isopropylidene diphenyl carbonate, “Iupilon S-3000” manufactured by Mitsubishi Engineering Plastics Co., Ltd., viscosity average molecular weight 21,000 (indicated as “PC”).
(2) Phosphate ester 1: “FP-500” manufactured by Asahi Denka Kogyo Co., Ltd. (in the general formula (2), X is a resorcin residue and R ^{4 to} R ⁷ are phenyl groups) ).
(3) Phosphate ester 2: “FP-700” manufactured by Asahi Denka Kogyo Co., Ltd. (in general formula (2), X is a bisphenol residue, and R ^{4 to} R ⁷ are phenyl groups) ).

(4) PTFE1: Polytetrafluoroethylene, “Polyflon F-201L” manufactured by Daikin Corporation.
(5) PTFE2: Core-shell type polytetrafluoroethylene, “Metabrene A-3800” manufactured by Mitsubishi Rayon Co., Ltd.

(6) Multilayer polymer 1: Polybutadiene core / polymethylmethacrylate shell copolymer, “EXL2603” manufactured by Rohm and Haas Co., Ltd.
(7) Multilayer polymer 2: Polyalkyl acrylate core / polymethyl methacrylate shell copolymer, “EXL-2313” manufactured by Kureha Chemical Co., Ltd.
(8) Multilayer polymer 3: Siloxane-containing polyalkyl acrylate core / polystyrene acrylonitrile shell copolymer, “RK-200” manufactured by Mitsubishi Rayon Co., Ltd.
(9) Multilayer structure polymer 4: Styrenic polymer core / polyalkyl acrylate mid / polystyrene acrylonitrile shell copolymer, “MG-1011” manufactured by Takeda Pharmaceutical Company Limited.

(10) Metal powder: Metax U grade (average particle size 30 μm), manufactured by Toyo Aluminum Co., Ltd.
(11) Blue pigment: Macrolex Blue 3R.
(12) ABS resin: manufactured by Technopolymer Co., Ltd., “DP-615”, butadiene component 40%.
(13) AS resin: “SAN-C” manufactured by Technopolymer Co., Ltd.

The physical properties of the test piece were evaluated as described below.
(14) Flammability: A vertical combustion test was performed using a UL standard test piece having a thickness of 1.6 mm and evaluated.
(15) Impact strength: Charpy impact test pieces were molded in accordance with ISO 179, and then the notch was cut and evaluated.
(16) DTUL: The load deflection temperature at 1.82 MPa was measured according to ISO75.
(17) Appearance (metallic tone): Judgment was made visually and evaluated according to the following criteria.
A: Excellent metallic tone, X: No metallic tone.

  100 parts by weight of aromatic polycarbonate resin and 8 parts by weight of phosphoric acid ester 1, 0.34 parts by weight of PTFE, 5.6 parts by weight of multilayer structure polymer 1, and 1 part by weight of metal powder, 0.05 parts by weight Part of the blue pigment and “Adeka Stub 2112” (Asahi Denka Kogyo Co., Ltd.) as a stabilizer were blended, mixed for 20 minutes with a tumbler, melt-kneaded at a cylinder temperature of 270 ° C. with a 30 mm twin screw extruder, Pelletized. Using the obtained pellets, a combustion test piece having a thickness of 1.6 mm was molded by an injection molding machine, and the flammability was evaluated. Furthermore, at a cylinder temperature of 300 ° C., a Charpy impact test piece, a test piece for DTUL evaluation, and a test piece for appearance (metallic tone) evaluation of 100 × 100 × 2 mm were formed. Thereafter, the Charpy impact test piece was cut with a notching machine and evaluated with a Charpy impact tester. The evaluation results are shown in Table-1.

  In Example 1, pellets were produced in the same manner as in Example 1 except that the amount of phosphate ester 1 was changed to 18.8 parts by weight and the amount of multilayer structure polymer 1 was changed to 6.3 parts by weight. Evaluation was performed. The results are shown in Table-1.

  In Example 1, except that the multilayer structure polymer 1 was changed to the multilayer structure polymer 2, pellets were produced in the same manner as in Example 1 and evaluated in the same manner. The results are shown in Table-1.

  In Example 1, except that the multilayer structure polymer 1 was changed to the multilayer structure polymer 3, pellets were produced in the same manner as in Example 1 and evaluated in the same manner. The results are shown in Table-1.

  In Example 1, except that the multilayer structure polymer 1 was changed to the multilayer structure polymer 4, pellets were produced in the same manner as in Example 1 and evaluated in the same manner. The results are shown in Table-1.

  In Example 1, pellets were produced in the same manner as in Example 1 except that 0.51 part by weight of PTFE2 was used instead of PTFE1, and evaluation was performed in the same manner. The results are shown in Table-1.

In Example 1, blending was carried out by a tumbler with a composition excluding phosphate ester 1, fed from the main feed port of the extruder, phosphate ester 2 was heated to 80 ° C., and the implementation of Table 1 was carried out with a pump from C3 barrel. The supply amount was set so as to obtain the composition of Example 7, and the mixture was melt-kneaded and pelletized. Evaluation was performed in the same manner as in Example 1 using this pellet. The results are shown in Table-1.
[Comparative Example 1]

In Example 1, the same composition as Example 1 was mix | blended except not containing metal powder and a blue pigment, the pellet was manufactured by the same method, and it evaluated similarly. The results are shown in Table-2.
[Comparative Example 2]
In Example 1, pellets were produced in the same manner as in Example 1 except that the multilayer structure polymer 1 was not included, and evaluation was performed in the same manner. The results are shown in Table-2.
[Comparative Example 3]
In Example 1, pellets were produced in the same manner as in Example 1 except that PTFE1 was not included, and evaluation was performed in the same manner. The results are shown in Table-2.

Blue pigment and metal powder were added to the pellets obtained in Comparative Example 1, pelletized by the same method as in Example 1, and evaluated in the same manner. The results are shown in Table-1.
[Comparative Example 4]

  100 parts by weight of aromatic polycarbonate resin and 9.2 parts by weight of ABS resin, 11.8 parts by weight of AS resin, 13.5 parts by weight of phosphate ester 1, 0.34 parts by weight of PTFE, 1 part by weight Multi-layer structure polymer 1, 1 part by weight of metal powder, 0.05 part by weight of blue pigment, and “Adeka Stub 2112” (manufactured by Asahi Denka Kogyo Co., Ltd.) as a stabilizer are blended and mixed for 20 minutes with a tumbler. Then, it pelletized with the cylinder temperature of 250 degreeC with the 30-mm twin-screw extruder. Using this pellet, a combustion test piece having a thickness of 1.6 mm was formed by an injection molding machine, and the flammability was evaluated. Furthermore, at a cylinder temperature of 240 ° C., a Charpy impact test piece, a test piece for DTUL evaluation, and a test piece for appearance (metallic tone) evaluation of 100 × 100 × 2 mm were formed. The evaluation results are shown in Table-2.

As is clear from Table-1 and Table-2, 1 part by weight of metal powder and 0.05 wt.% Of blue pigment were added to the molded article not containing the metal powder and blue pigment of Comparative Example 1 and showing no metallic appearance. Partly added molded article showing the metallic appearance of Example 1 shows a value of 15 or more although a decrease in Charpy impact strength is observed, and this Charpy impact strength is at a level that can be used for housing applications. . Furthermore, in Examples 3, 4 and 5 in which the multi-layered polymer was different, a good appearance was exhibited and good combustibility was obtained.
On the other hand, in Comparative Example 2 in which the multilayer structure polymer is not added, the Charpy impact strength is greatly reduced, which is not preferable. As for PTFE, in Comparative Example 3 in which PTFE was not added, the flammability was V-2, which was insufficient. In Examples using PTFE1 or PTFE2, the flammability was V-0, which was even better. The appearance was good, and the impact and flammability were satisfactory. Further, in Comparative Example 4, when 21 parts by weight of the ABS component and AS component are added as a total amount, 13.5 parts by weight of a flame retardant is further required to ensure the target combustibility, and the heat resistance is 80 in DTUL. It is not preferable because it is lower than that at 110 ° C. in Example 1 and is restricted by the use environment.

Claims (4)

(A) 100 parts by weight of an aromatic polycarbonate resin, (b) 0.5 to 40 parts by weight of a phosphorus-based flame retardant, (c) 0.01 to 5 parts by weight of a polyfluoroethylene resin, and (d) an alkyl ( It contains 0.5 to 30 parts by weight of a multilayer structure polymer containing a (meth) acrylate polymer, and (e) 0.05 to 5 parts by weight of metal particles, and the above (a), (c), (d The polycarbonate resin composition whose content of the thermoplastic resin other than) is 5% by weight or less based on the total amount with the weight of the (a) aromatic polycarbonate resin. The polycarbonate resin composition according to claim 1, wherein the (b) phosphorus-based flame retardant is selected from the phosphoric ester-based flame retardants represented by the following general formula (1) or general formula (2).
(Wherein R ¹ , R ² and R ³ each represents an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 20 carbon atoms which may be substituted with an alkyl group, h, i and j Each represents 0 or 1).
(Wherein R ⁴ , R ⁵ , R ⁶ and R ⁷ each represents an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 20 carbon atoms which may be substituted with an alkyl group, p, q, r and s are each 0 or 1, m is a number from 1 to 5, and X represents an arylene group). (D) A multilayer structure polymer containing an alkyl (meth) acrylate polymer as a constituent component has an inner core layer made of a crosslinked rubbery polymer and an outermost shell layer made of an alkyl (meth) acrylate polymer. The polycarbonate resin composition according to claim 1, wherein the polycarbonate resin composition is a multilayer structure polymer. The polycarbonate resin composition according to any one of claims 1 to 3, wherein the metal particles are aluminum particles.