JP2009120791A - Flame-retardant polycarbonate resin composition excellent in weld part appearance and molded article consisting of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polycarbonate resin composition that has high flowability, improves uneven weld part appearance, and uses a certain silicone compound instead of flame retardants based on halogen such as bromine and chlorine to improve flame retardancy significantly, and to provide a molded article consisting of the composition. <P>SOLUTION: The flame-retardant polycarbonate resin composition includes 100 pts.wt. of a polycarbonate resin (A), 0.01-5 pts.wt. of a metallic pigment (B), 0.3-25 pts.wt. of mica (except for metal-coated mica and pearl mica) (C), 0.01-5 pts.wt. of a certain silicone compound (D), 0.01-0.3 pt.wt. of an organometallic salt compound (E), and 0.05-5 pts.wt. of a fiber-forming fluorine-containing polymer (F), and if desired, a certain flowability improver (G), and is excellent in weld part appearance. The polycarbonate resin composition has high flowability and provides molded articles that maintain performances such as excellent impact strength, heat resistance, and thermal stability which polycarbonate resins originally have, and that are excellent in flame retardancy and provide metallic feeling with little uneven weld part appearance. Therefore, the composition has an extremely high value in industrial utilization. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a polycarbonate resin composition and a molded article having a metallic feeling formed therefrom. More specifically, a polycarbonate resin composition which imparts flame retardancy while maintaining the impact resistance, heat resistance, thermal stability, etc., which are the characteristics of a polycarbonate resin, and has improved weld appearance and fluidity The molded product is provided.

  Polycarbonate resin is a thermoplastic resin excellent in impact resistance, heat resistance, thermal stability, and the like, and is widely used in fields such as electricity, electronics, ITE, machinery, and automobiles. On the other hand, taking advantage of these excellent performances of the resin, in each of the above-mentioned fields, a material having a metallic appearance may be required in terms of design and design.

  As a technique for imparting a metallic appearance to a polycarbonate resin composition, metal fine powder (Patent Document 1), metal-coated glass flakes or mica (Patent Document 2), or aluminum powder and pearl mica are used in combination (Patent Document 3). And have been proposed to be added. However, by using these methods, although a metallic appearance can be obtained, an appearance defect occurs at a portion (weld portion) where two or more flows of the molten material divided in the product mold join at the time of injection molding. There was a problem. Specifically, the metallic appearance unevenness appears remarkably in the weld part, and the value as a product is remarkably lowered. Therefore, the improvement has been strongly desired conventionally.

JP 2000-17169 A Japanese Patent Laid-Open No. 10-158540 Japanese Patent Laid-Open No. 5-93091

  Polycarbonate resin, on the other hand, is a highly flame-retardant plastic material with self-extinguishing properties. However, in order to meet safety requirements in the electric, electronic, and OA fields, it is more difficult to meet the requirements of UL94V-0 and V-1. Flammability is required. In order to improve the flame retardancy, a method of blending a halogen compound or a phosphorus compound as a flame retardant has been conventionally employed. However, it is desired to use a flame retardant that does not contain halogen compounds such as bromine and chlorine in consideration of the environment.

  Furthermore, depending on the use of the product, a polycarbonate resin material having good fluidity has been demanded. Various techniques have been proposed as methods for improving fluidity, but all have advantages and disadvantages, and satisfactory materials are not necessarily proposed. For example, paying attention to the molecular weight of the polycarbonate resin, a method using a high molecular weight and a low molecular weight in combination and using a branched polycarbonate resin (Patent Document 4), blending an ABS resin or MBS resin in the polycarbonate resin (Patent Document 5) or a method of blending an ABS resin or a phosphate ester with a polycarbonate resin (Patent Document 6) has been proposed. Among these techniques, the above-mentioned excellent characteristics of the polycarbonate resin are included. There is a problem that any one or more of them are greatly damaged, and there has been a strong demand for improvement. Moreover, although the method (patent document 7) which improves a fluidity | liquidity by mix | blending a fatty acid with polycarbonate resin is proposed, although fluidity | liquidity improves, decomposition | disassembly of polycarbonate resin by a fatty acid occurs and mechanical strength is improved. There were fundamental problems such as incurring a decrease in

JP 2001-226576 A JP 2000-319497 A JP 2000-103951 A JP 61-162520 A

  The present invention improves the appearance unevenness of the above-mentioned weld part, and remarkably enhances the flame retardancy by using a specific silicone compound instead of a halogen-based flame retardant such as bromine or chlorine, and further increases the fluidity. Another object of the present invention is to provide a polycarbonate resin composition that can also comprise a molded article comprising the polycarbonate resin composition.

  As a result of diligent research in view of such problems, the present inventors have formulated a specific mica different from the metal-coated mica or pearl mica that has been used as a metallic pigment in the polycarbonate resin to which the metallic pigment is added. Surprisingly, the uneven appearance of the weld part is improved, and the desired flame retardancy can be obtained without using halogen compounds such as bromine and chlorine as the flame retardant. The inventors have found that a polycarbonate resin composition having high fluidity can be obtained by additionally blending, and have completed the present invention.

  That is, the first aspect of the present invention is that polycarbonate resin (A) 100 parts by weight, metallic pigment (B) 0.01-5 parts by weight, mica (excluding metal-coated mica and pearl mica) (C) 0.3 .About.25 parts by weight, a silicone compound (D) in which the main chain has a branched structure and the organic functional group contained consists of an aromatic group, or consists of an aromatic group and a hydrocarbon group (excluding an aromatic group). Excellent in the appearance of the weld part comprising 01 to 5 parts by weight, organometallic salt compound (E) 0.01 to 0.3 parts by weight and fiber-forming fluoropolymer (F) 0.05 to 5 parts by weight A flame-retardant polycarbonate resin composition and a molded product comprising the same are provided.

  The second aspect of the present invention is as follows. Polycarbonate resin (A) 100 parts by weight, metallic pigment (B) 0.01-5 parts by weight, mica (excluding metal-coated mica and pearl mica) (C) 0.3 ˜25 parts by weight, a silicone compound (D) in which the main chain has a branched structure and the organic functional group contained is composed of an aromatic group, or is composed of an aromatic group and a hydrocarbon group (excluding an aromatic group). 01 to 5 parts by weight, organometallic salt compound (E) 0.01 to 0.3 parts by weight, fiber-forming fluoropolymer (F) 0.05 to 5 parts by weight and fluidity improver (G) 2 to 2 The resin composition comprising 12 parts by weight, wherein the fluidity improver (G) is a copolymer of an aromatic vinyl monomer and phenyl methacrylate, and has an excellent appearance in the weld part Flame retardant polycarbonate resin composition, And it provides a molded article comprising the same each time.

    The polycarbonate resin composition of the present invention is excellent in flame retardancy while maintaining the excellent impact strength, heat resistance, thermal stability, etc. inherent in the polycarbonate resin, and has a metallic feeling with little appearance unevenness in the weld portion. Since a molded article can be obtained and it can have higher fluidity, its industrial utility value is extremely high.

  The polycarbonate resin (A) used in the present invention is obtained by a phosgene method in which various dihydroxydiaryl compounds and phosgene are reacted, or a transesterification method in which a dihydroxydiaryl compound and a carbonate such as diphenyl carbonate are reacted. A typical example of the polymer is a polycarbonate resin produced from 2,2-bis (4-hydroxyphenyl) propane (commonly referred to as bisphenol A).

  Examples of the dihydroxydiaryl compound include bisphenol 4-, bis (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, 2,2-bis (4-hydroxyphenyl) butane, 2, 2-bis (4-hydroxyphenyl) octane, bis (4-hydroxyphenyl) phenylmethane, 2,2-bis (4-hydroxyphenyl-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, 2,2-bis ( Bis (hydroxyaryl) alkanes such as 4-hydroxy-3,5-dichlorophenyl) propane, 1,1- (4-hydroxyphenyl) cyclopentane, bis (hydroxyaryl) cycloalkanes such as 1,1-bis (4-hydroxyphenyl) cyclohexane, 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxy-3 Dihydroxy diaryl ethers such as 3,3'-dimethyldiphenyl ether, dihydroxy diaryl sulfides such as 4,4'-dihydroxydiphenyl sulfide, 4,4'-dihydroxydiphenyl sulfoxide, 4,4'-dihydroxy-3,3 ' Dihydroxy diaryl sulfoxides such as dimethyldiphenyl sulfoxide, dihydroxy diary such as 4,4'-dihydroxydiphenyl sulfone, 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfone Sulfone, and the like. However, it is preferred from the environmental viewpoint to use a dihydroxydiaryl compound not substituted with halogen.

  These may be used alone or in combination of two or more. In addition to these, piperazine, dipiperidyl hydroquinone, resorcin, 4,4′-dihydroxydiphenyl, and the like may be used in combination.

  Furthermore, the above dihydroxyaryl compound and a trivalent or higher phenol compound as shown below may be used in combination. Trihydric or higher phenols include phloroglucin, 4,6-dimethyl-2,4,6-tri- (4-hydroxyphenyl) -heptene, 2,4,6-dimethyl-2,4,6-tri- (4 -Hydroxyphenyl) -heptane, 1,3,5-tri- (4-hydroxyphenyl) -benzol, 1,1,1-tri- (4-hydroxyphenyl) -ethane and 2,2-bis- [4 4- (4,4'-dihydroxydiphenyl) -cyclohexyl] -propane and the like.

  The viscosity average molecular weight of the polycarbonate resin (A) is not particularly limited, but is usually in the range of 10,000 to 100,000, more preferably 15,000 to 30,000, and even more preferably 17,000 to 26,000 in terms of moldability and strength. Moreover, when manufacturing this polycarbonate resin, a molecular weight modifier, a catalyst, etc. can be used as needed.

  Examples of the metallic pigment (B) used in the present invention include glass flakes provided with a metal film and aluminum fine powder having an average particle size of 100 μm or less.

  The compounding quantity of a metallic pigment (B) is 0.01-5 weight part with respect to 100 weight part of polycarbonate resin (A). If the blending amount is less than 0.01 parts by weight, the metallic appearance is inferior, which is not preferable. On the other hand, when the amount exceeds 5 parts by weight, the thermal stability of the resin composition is lowered, thereby causing a problem that the granulation property is lowered and the appearance of the product after injection molding is deteriorated. Preferably it is 0.05-1 weight part, More preferably, it is the range of 0.05-0.7 weight part.

  Mica (C) used in the present invention is a silicate mineral excluding metal-coated mica and pearl mica, and has a flake shape. Further, those having an average particle diameter of 10 to 70 μm and an average aspect ratio of 70 to 90 can be suitably used. In particular, mica, which is used for the purpose of improving rigidity and preventing warping as a filler for resin, can be suitably used. The mica (C) has an effect of adjusting the orientation of the metallic pigment in the resin, and can obtain a metallic feeling with little appearance unevenness in the weld portion. On the other hand, when metal-coated mica and pearl mica, which have been used conventionally, are used as the mica (C) of the present invention, since these themselves act as metallic pigments, the appearance unevenness of the welded portion becomes even more remarkable, which is not preferable. .

  The compounding quantity of mica (C) is 0.3-25 weight part with respect to 100 weight part of polycarbonate resin (A). If it is less than 0.3 part by weight, the effect of adjusting the orientation of the metallic pigment (B) is not sufficient, and if it exceeds 25 parts by weight, the metallic luster is inferior. More preferably, it is 0.5-20 weight part, More preferably, it is the range of 3.5-10 weight part. In this range, it is possible to obtain a metallic feeling with less uneven appearance of the weld.

The silicone compound (D) used in the present invention consists of a branched structure in the main chain and an organic functional group consisting of an aromatic group, or an aromatic group and a hydrocarbon group (excluding an aromatic group). Is represented by the following general formula (1).
General formula (1)

Here, R1, R2, and R3 represent main chain organic functional groups, and X represents a terminal functional group.
That is, it has a T unit (RSiO _1.5 ) and / or a Q unit (SiO _2.0 ) as a branch unit. These preferably contains more than 20 mol% of the total siloxane units _{(R 3~0 SiO 2~0.5).} (R represents an organic functional group.) The silicone compound (D) preferably contains 20 mol% or more of aromatic groups among the organic functional groups contained.

  The aromatic group contained is phenyl, biphenyl, naphthalene or a derivative thereof, but a phenyl group can be preferably used.

  Of the organic functional groups in the silicone compound (D) attached to the main chain or branched side chain, the organic group other than the aromatic group is preferably a hydrocarbon group having 4 or less carbon atoms, and preferably a methyl group. Can be used. Furthermore, the terminal group is preferably one kind selected from methyl group, phenyl group and hydroxyl group, or a mixture of these two kinds to three kinds.

  The average molecular weight (weight average) of the silicone compound (D) is preferably 3000 to 500000, and more preferably 5000 to 270000.

  The compounding quantity of a silicone compound (D) is 0.01-5 weight part per 100 weight part of polycarbonate resin (A). If the blending amount is out of this range, it is not preferable since a sufficient flame retardant effect cannot be obtained. More preferably, it is 0.03 to 2 parts by weight.

  Examples of the organic metal salt compound (E) used in the present invention include aromatic sulfonic acid metal salts and perfluoroalkanesulfonic acid metal salts. Examples of the metal include alkali metals and alkaline earth metals. Preferably, potassium salt of 4-methyl-N- (4-methylphenyl) sulfonyl-benzenesulfonamide, potassium diphenylsulfone-3-sulfonate, potassium diphenylsulfone-3-3'-disulfonate, paratoluenesulfonic acid Sodium, perfluorobutanesulfonic acid potassium salt and the like can be used.

  The compounding amount of the organometallic salt compound (E) is 0.01 to 0.3 parts by weight with respect to 100 parts by weight of the polycarbonate resin (A). If the blending amount is less than 0.01 parts by weight, the flame retardancy is lowered, which is not preferable. Moreover, when it exceeds 0.3 weight part, since the problem that a flame retardance falls will generate | occur | produce, it is not preferable. Preferably it is 0.02-0.2 weight part, More preferably, it is 0.02-0.1 weight part.

  As the fiber-forming fluorine-containing polymer (F) used in the present invention, those that form a fiber structure (fibril structure) in the polycarbonate resin (A) are preferable. Polytetrafluoroethylene, tetrafluoroethylene Examples thereof include a system copolymer (for example, tetrafluoroethylene / hexafluoropropylene copolymer, etc.), a partially fluorinated polymer as shown in US Pat. No. 4,379,910, a polycarbonate produced from a fluorinated diphenol, and the like. In particular, polytetrafluoroethylene having a molecular weight of 1,000,000 or more and a fibril-forming ability having a secondary particle diameter of 100 μm or more is preferably used.

  The compounding amount of the fiber-forming fluoropolymer (F) is 0.05 to 5 parts by weight with respect to 100 parts by weight of the polycarbonate resin (A). If the blending amount is less than 0.05 parts by weight, the effect of preventing dripping during combustion is inferior, which is not preferable. On the other hand, if the amount exceeds 5 parts by weight, granulation becomes difficult, which hinders stable production. This amount is preferably 0.05 to 1 part by weight, more preferably 0.1 to 0.5 part by weight. In this range, the balance between flame retardancy and moldability is further improved.

  The fluidity improver (G) used in the present invention is a copolymer of an aromatic vinyl monomer and phenyl methacrylate. Examples of aromatic vinyl monomers include styrene, α-methylstyrene, p-tert. Butyl styrene etc. are mentioned, These can be used individually or in mixture of 2 or more types. Preferable fluidity improvers (G) include styrene / phenyl methacrylate copolymers or styrene / α-methyl styrene / phenyl methacrylate copolymers.

  Examples of the polymerization method of the fluidity improver (G) include emulsion polymerization, suspension polymerization, and bulk polymerization, and emulsion polymerization is particularly preferably used.

  The fluidity improver (G) is commercially available, and includes Metablene TP003 manufactured by Mitsubishi Rayon Co., Ltd.

  The compounding quantity of a fluid improvement agent (G) is 2-12 weight part with respect to 100 weight part of polycarbonate resin (A). If the blending amount is less than 2 parts by weight, the effect of improving the fluidity is inferior. More preferably, it is 3-10 weight part, More preferably, it is 4-8 weight part.

  Various blending components (A), (B), (C), (D), (E), (F) of the present invention, and, if desired, the blending method of (G) is not particularly limited, and any mixer For example, these can be mixed with a tumbler, ribbon blender, high-speed mixer, etc., and melt kneaded with a normal single-screw or twin-screw extruder. Moreover, there is no restriction | limiting in particular also about the mixing | blending order of these compounding components, collective mixing, and division | segmentation mixing.

  In addition, other known additives such as mold release agents, ultraviolet absorbers, fillers, antistatic agents, antioxidants, phosphorus-based heat stabilizers, dyes and pigments, and additives (when epoxy is used) may be added at the time of mixing. Bean oil, liquid paraffin, and the like).

  EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. Parts and% are based on weight unless otherwise specified.

The details of the used blending components are as follows.
Polycarbonate resin:
Caliber 200-20 (viscosity average molecular weight: 19000) manufactured by Sumitomo Dow
(Hereafter abbreviated as PC)
Metallic pigment:
Aluminum paste G manufactured by Toyo Aluminum Co., Ltd. (hereinafter abbreviated as M-1)
Metashine MC5090PS manufactured by Nippon Sheet Glass Co., Ltd. (hereinafter abbreviated as M-2)
Mica:
A41 manufactured by Yamaguchi Mica Industry (hereinafter abbreviated as mica)

Silicone compound: (hereinafter abbreviated as “silicone compound”)
The silicone compound was produced according to a general production method. That is, a silicone compound partially condensed by dissolving an appropriate amount of diorganodichlorosilane, monoorganotrichlorosilane and tetrachlorosilane, or a partially hydrolyzed condensate thereof in an organic solvent, adding water and hydrolyzing it. Then, triorganochlorosilane was added and reacted to terminate the polymerization, and then the solvent was separated by distillation or the like. The structural characteristics of the silicone compound synthesized by the above method are as follows:
・ D / T / Q unit ratio of main chain structure: 40/60/0 (molar ratio)
-Ratio of phenyl group in all organic functional groups (*): 60 mol%
-Terminal group: methyl group only-Weight average molecular weight (**): 15000
*: The phenyl group is first contained in the T unit in the silicone containing the T unit, and the remaining D group is contained in the D unit. When the phenyl group is attached to the D unit, the one attached is preferential, and when the phenyl group remains, two are attached. Except for the terminal group, the organic functional group is a methyl group except for the phenyl group.
**: Weight average molecular weight is two significant digits.

Organometallic salt compounds:
Sodium paratoluenesulfonate (hereinafter abbreviated as metal salt)
Fiber-forming fluorine-containing polymer:
NEOFRON FA500 (polytetrafluoroethylene) manufactured by Daikin Industries, Ltd.
(Hereafter abbreviated as PTFE)
Fluidity improver:
Styrene / phenyl methacrylate copolymer TP003 manufactured by Mitsubishi Rayon Co., Ltd. (hereinafter abbreviated as fluidity improver)

(Evaluation of granulation property of resin composition)
The above-mentioned various blending components were collectively put into a tumbler at the blending ratios shown in Tables 2 to 4, and after dry mixing for 10 minutes, using a twin-screw extruder (Kobe Steel Works KTX37), a melting temperature of 280 It knead | mixed at (degreeC) and the pellet of the polycarbonate resin composition was obtained. In that case, the state of the strand discharged | emitted from the said extruder was observed visually, and the granulation property was determined based on the following references | standards. The results are shown in Tables 2-4.
Good granulation: Stable processing is possible without breaking the strands.
Poor granulation: Processing is difficult because the strands are easily cut.

(Appearance evaluation of weld part of molded product)
The pellets of the various resin compositions obtained above were dried at 125 ° C. for 4 hours, respectively, and then set at a set temperature of 280 ° C. and an injection pressure of 1600 kg / cm ² using an injection molding machine (Japan Steel Works J-100SAII). A test piece for external appearance evaluation (150 × 90 × 3.0 mm) was prepared. In addition, the mold for producing the test piece was provided with gates on both sides in the longitudinal direction so that a weld was generated at the center of the test piece. The appearance of the weld portion was visually observed, and the appearance was determined based on the following criteria. The results are shown in Tables 2-4.
Appearance is good: A uniform metallic feeling can be obtained even at the weld.
Appearance failure: Metallic feeling is significantly different from the weld.

(Flame retardance evaluation)
After the pellets of the various resin compositions obtained were dried at 125 ° C. for 4 hours, flame retardancy was performed at a set temperature of 280 ° C. and an injection pressure of 1600 kg / cm ² using an injection molding machine (J-100SAII manufactured by Nippon Steel). An evaluation test piece (125 × 13 × 2.5 mm) was prepared. The obtained specimen is left in a thermostatic chamber at a temperature of 23 ° C. and a humidity of 50% for 72 hours, and is subjected to UL94 test (flammability test of plastic materials for equipment parts) defined by Underwriters Laboratories. Compliant flame retardant evaluation was performed. The results are shown in Tables 2-4.
The flame resistance class of UL94 is as shown in Table 1.

The after flame time is the length of time that the test piece after the ignition source is moved away from the flame, and the ignition of the cotton by the drip is for the sign about 300 mm below the lower end of the test piece. Of cotton is ignited by a drip from the specimen.

(Archimedes spiral flow fluidity)
The pellets of the resin compositions obtained above were each dried at 125 ° C. for 4 hours, and then subjected to conditions of a melting temperature of 280 ° C. and an injection pressure of 1600 kg / cm ² using an injection molding machine (J-100SAII manufactured by Nippon Steel). Below, using an Archimedes spiral flow mold, the flow length at a channel thickness of 1 mm was measured. A flow length of 140 mm or more was regarded as acceptable.

* NR: Abbreviation of No Rating. It does not belong to V-0, V-1, or V-2.

  When the polycarbonate resin composition satisfied the constituent requirements of the present invention (Examples 1 to 8), good results were exhibited over all the evaluation items.

On the other hand, in the case where the polycarbonate resin composition does not satisfy the constituent requirements of the present invention, each case has some drawbacks.
In Comparative Examples 1 and 2, the compounding amount of the metallic pigment was less than the range defined by the present invention, and the appearance of the weld part was inferior.
In Comparative Example 3, the amount of mica was less than the range defined by the present invention, and the appearance of the weld portion was inferior.
The comparative example 4 is a case where the compounding quantity of a metallic pigment is more than the range which this invention defines, and it was inferior to granulation property and a flame retardance because heat stability fell.
In Comparative Example 5, the amount of mica was greater than the range defined by the present invention, and the appearance of the weld portion was inferior.
The comparative example 6 is a case where the compounding quantity of a silicone compound is less than the range which this invention sets, and was inferior to a flame retardance.
In Comparative Example 7, the compounding amount of the silicone compound was larger than the range defined by the present invention, and the flame retardancy was poor.

  In addition to the resin composition having the blending ratio shown in Example 2 in Table 2, a fluidity improver was further blended at the blending ratio shown in Table 4. Except for this, the same operations as in Example 2 were performed, and various performances were evaluated. The results are shown in Table 4.

* NR: Abbreviation of No Rating. It does not belong to V-0, V-1, or V-2.

As shown in Table 4, when the configuration of the present invention was satisfied (Examples 9 and 10), all the evaluation items had sufficient performance.
On the other hand, as shown in Comparative Example 8, when the blending amount of the fluidity improver is larger than the specified amount, the weld part appearance and Archimedes spiral flow fluidity pass, but the flame retardancy and granulation property are inferior. It was.

Claims (6)

  Polycarbonate resin (A) 100 parts by weight, metallic pigment (B) 0.01-5 parts by weight, mica (excluding metal-coated mica and pearl mica) (C) 0.3-25 parts by weight, the main chain has a branched structure And 0.01 to 5 parts by weight of a silicone compound (D) composed of an aromatic group or an aromatic group and a hydrocarbon group (excluding an aromatic group), an organic metal salt compound ( E) A flame retardant polycarbonate resin composition excellent in the appearance of the weld part, comprising 0.01 to 0.3 part by weight and 0.05 to 5 parts by weight of a fiber-forming fluoropolymer (F).   Polycarbonate resin (A) 100 parts by weight, metallic pigment (B) 0.01-5 parts by weight, mica (excluding metal-coated mica and pearl mica) (C) 0.3-25 parts by weight, the main chain has a branched structure And 0.01 to 5 parts by weight of a silicone compound (D) composed of an aromatic group or an aromatic group and a hydrocarbon group (excluding an aromatic group), an organic metal salt compound ( E) A resin composition comprising 0.01 to 0.3 parts by weight, 0.05 to 5 parts by weight of a fiber-forming fluoropolymer (F) and 2 to 12 parts by weight of a fluidity improver (G). A flame retardant polycarbonate resin composition having an excellent weld appearance, wherein the fluidity improver (G) is a copolymer of an aromatic vinyl monomer and phenyl methacrylate.   The flame retardant polycarbonate resin composition having excellent appearance of the weld part according to claim 1 or 2, wherein the metallic pigment (B) is a glass flake provided with an aluminum fine powder or a metal film.   The blended amount of the mica (C) is 3.5 to 10 parts by weight per 100 parts by weight of the polycarbonate resin (A), and the weld part according to claim 1 or 2 is excellent in appearance. Flame retardant polycarbonate resin composition.   The flame retardant polycarbonate resin composition having excellent weld appearance according to claim 2, wherein the fluidity improver (G) is a styrene / phenyl methacrylate copolymer or a styrene / α-methylstyrene / phenyl methacrylate copolymer. .   The molded product formed from the flame-retardant polycarbonate resin composition excellent in the external appearance of the weld part as described in any one of Claims 1-5.