JP2011111590A - Flame-retardant polycarbonate resin composition excellent in light reflectivity, and molded article thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polycarbonate resin composition having a high light-reflectivity and a good flame retardancy; and a light reflecting plate formed by molding this composition. <P>SOLUTION: The flame-retardant polycarbonate resin composition and molded article thereof excellent in the light reflectivity comprise a polycarbonate resin (A), titanium oxide (B), a divalent metal salt of sulfuric acid (C), a silicone compound (D), an organic metal salt (E), a fiber-forming type fluorine-containing polymer (F), and a flow improver (G) of a copolymer comprising an aromatic vinyl-based monomer and a phenyl methacrylate. The flame-retardant polycarbonate resin composition excellent in the light reflectivity, not using the conventional flame retardant containing bromine or chlorine, thus having no anxiety for evolving a gas containing the bromine or chlorine caused from the flame-retardant when burning, and also using no phosphorus-based flame retardant, consequently is excellent in the environmental aspect, moreover having both the excellent fluidity and good impact resistance while keeping the excellent flame retardancy and high light reflectivity, is especially suitable for such use as a large-sized and thin-walled liquid crystal frame or as a light-reflecting plate for use in lamp holders. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a polycarbonate resin composition having high light reflectivity and good flame retardancy, and a light reflecting plate formed from the composition. Since the resin composition according to the present invention is excellent in light reflectivity and flame retardancy, and further excellent in impact resistance and appearance, it can be suitably used particularly for a light reflection plate for a liquid crystal frame or a lamp holder.

Polycarbonate resin is a thermoplastic resin excellent in impact resistance, heat resistance, and the like, and is widely used in fields such as electricity, electronics, machinery, and automobiles. In particular, in applications of light reflectors such as frames and lamp holders for liquid crystal display devices, polycarbonate resin has attracted attention in terms of impact resistance and heat resistance. A method of blending a large amount of titanium oxide has been proposed. Further, it has been attempted to obtain a desired light reflectivity by treating the surface of titanium oxide. (See Patent Documents 1 to 3)
JP 2005-320457 A JP 2005-015655 A JP 2003-183491 A

On the other hand, polycarbonate resins used for liquid crystal frames and lamp holders are required to have high flame retardancy equivalent to UL94V-0 and V-1 in order to satisfy not only light reflectivity but also safety requirements. In making the polycarbonate resin flame retardant for this application, a method of blending a halogen compound or a phosphorus compound as a flame retardant has been conventionally employed (see Patent Document 4). Among these, particularly halogen compounds such as bromine and chlorine are desired to use flame retardants that do not contain them from the viewpoint of the environment, and proposals for flame retardants using silicone flame retardants have been made. (See Patent Document 5)
JP 2000-302959 A JP 2003-155405 A

  For polycarbonate resin used in liquid crystal frames and lamp holders, in addition to the inherently superior impact resistance and heat resistance, not only high flame retardancy but also high light reflectivity was required. . Although flame retardant polycarbonate resin containing a large amount of titanium oxide improves light reflectivity, it also has problems such as poor thermal stability and molding processability during injection molding, and lowering the surface appearance of the molded product. These improvements have been desired.

On the other hand, depending on the application and design of the product, a polycarbonate resin material having good fluidity is required. 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 both a high molecular weight and a low molecular weight and using a polycarbonate resin branched into either one (Patent Document 5), blending ABS resin or MBS resin in the polycarbonate resin (Patent Document 6) or a method of blending an ABS resin or a phosphate ester with a polycarbonate resin (Patent Document 7) has been proposed. Among these excellent features of the polycarbonate resin, these techniques are proposed. However, there is a problem that one or more of them are greatly damaged, and there has been a strong demand for improvement in the past.
Moreover, although the method (patent document 8) which improves fluidity | liquidity by mix | blending a fatty acid with polycarbonate resin is proposed, although fluidity | liquidity improves by this method, decomposition | disassembly of polycarbonate resin by fatty acid occurs and mechanical strength is proposed. 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

  As a result of intensive studies in view of such problems, the present inventors have found that a polycarbonate resin flame-retarded with a specific silicone compound contains titanium oxide, a divalent metal salt of sulfuric acid, an organometallic salt compound, and a fiber-forming type. It has been found that by blending a specific amount of fluoropolymer and a fluidity improver, it exhibits excellent light reflectivity, flame retardancy and fluidity without impairing various excellent properties of polycarbonate resin. The invention has been completed.

  That is, the present invention includes polycarbonate resin (A) 100 parts by weight, titanium oxide (B) 5 to 25 parts by weight, divalent metal sulfate (C) 0.01 to 10 parts by weight, the main chain having a branched structure and containing 0.01 to 3 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 (E) 0 0.01 to 2 parts by weight, 0.01 to 2 parts by weight of a fiber-forming fluoropolymer (F), a fluidity improver (G) 2 comprising a copolymer of an aromatic vinyl monomer and phenyl methacrylate The present invention provides a flame retardant polycarbonate resin composition having excellent light reflectivity and a molded product comprising the same.

  Since the flame retardant polycarbonate resin composition excellent in light reflectivity of the present invention does not use a conventional flame retardant containing bromine or chlorine, generation of a gas containing bromine or chlorine due to the flame retardant during combustion is generated. It is environmentally friendly because there is no concern and no phosphorus flame retardant is used. In addition, while maintaining excellent flame retardancy and high light reflectivity, it combines excellent fluidity and good impact strength, so the light reflector for liquid crystal frames or lamp holders is particularly large and thin. It is suitable for applications such as the above, and its practical 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 (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.

  These are used singly or as a mixture of two or more. However, it is preferable not to be substituted with a halogen from the viewpoint of preventing discharge of a gas containing halogen, which is a concern during combustion, into the environment. In addition to these, piperazine, dipiperidyl hydroquinone, resorcin, 4,4'-dihydroxydiphenyl, and the like may be mixed and used.

  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 usually 10,000 to 100,000, preferably 12,000 to 35,000, and more preferably 15,000 to 28,000. In producing such an aromatic polycarbonate resin, a molecular weight regulator, a catalyst, and the like can be used as necessary. The viscosity average molecular weight is determined by measuring the specific viscosity (ηsp) at a temperature of 20 ° C. using a Cannon-Fenske type viscosity tube using methylene chloride as a solvent and using a Cannon-Fenske type viscosity tube. η] was obtained and calculated from the following SCHNELL equation.
[Η] = 1.23 × 10 ⁻⁴ M ^0.83

  The titanium oxide (B) used in the present invention may be one produced by the chlorine method or the sulfuric acid method, and the crystal form may be either rutile type or anatase type. Further, the particle size of titanium oxide is preferably about 0.1 to 0.5 μm.

  Examples of commercially available titanium oxide include DuPont R902, Resino Color Industries DCF 17007, Kronos 2230, Ishihara Sangyo Typek PF740, and the like.

  The compounding quantity of a titanium oxide (B) is 5-25 weight part per 100 weight part of polycarbonate resin (A). If the blending amount is less than 5 parts by weight, the light reflectivity is inferior, and if it exceeds 25 parts by weight, the appearance and mechanical strength (impact strength) are deteriorated. A more preferable blending amount is in the range of 9 to 20 parts by weight.

  Examples of the divalent metal sulfate (C) used in the present invention include barium sulfate, calcium sulfate, and strontium sulfate. These may be used alone or in combination of two or more. Of these, barium sulfate can be preferably used.

  The compounding quantity of a divalent metal sulfate (C) is 0.01-10 weight part with respect to 100 weight part of polycarbonate resin (A). When the blending amount is less than 0.01 parts by weight, the flame retardancy is inferior, and when the blending amount exceeds 10 parts by weight, the impact strength decreases, which is not preferable. More preferably, it is 0.05-8 weight part, More preferably, it is 0.1-5 weight part.

The silicone compound (C) used in the present invention comprises a branched main chain and an organic functional group comprising 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, R ₁ , R ₂ and R ₃ 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.) Further, the silicone compound (C) 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 (C) 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. Further, 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 (C) is preferably 3,000 to 500,000, and more preferably 5,000 to 270000.

  The compounding quantity of a silicone compound (C) is 0.01-3 weight part per 100 weight part of polycarbonate resin (A). If the blending amount is out of this range, any flame retardant effect cannot be obtained. More preferably, it is in the range of 0.02 to 2 parts by weight.

  Examples of the organic metal salt (E) include a metal salt of an aromatic sulfonic acid and a metal salt of a perfluoroalkanesulfonic acid, preferably 4-methyl-N- (4-methylphenyl) sulfonyl-benzenesulfonamide. , Potassium diphenylsulfone-3-sulfonate, potassium diphenylsulfone-3-3′-disulfonate, sodium paratoluenesulfonate, potassium perfluorobutanesulfonate, and the like.

  The compounding amount of the organic metal salt (E) is 0.01 to 2 parts by weight per 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. On the other hand, when the amount exceeds 2 parts by weight, problems such as failure to obtain mechanical properties and flame retardancy and deterioration of the surface appearance occur. A more preferable blending amount is in the range of 0.2 to 1 part by weight.

  As the fiber-forming fluorine-containing polymer (F) used in the present invention, those that form a fibrillar structure in the polycarbonate resin (A) are preferable. For example, polytetrafluoroethylene, tetrafluoroethylene-based copolymer (For example, tetrafluoroethylene / hexafluoropropylene copolymer, etc.), partially fluorinated polymers as shown in US Pat. No. 4,379,910, polycarbonates produced from fluorinated diphenols, 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 0.01 to 2 parts by weight per 100 parts by weight of the polycarbonate resin. If the blending amount is less than 0.01 parts by weight, the anti-dripping property is inferior, and if it exceeds 2 parts by weight, the surface appearance and mechanical properties (impact strength) deteriorate, which is not preferable. More preferably, it is in the range of 0.2 to 1 part by weight.

  Examples of the aromatic vinyl monomer used in the fluidity improver (G) comprising a copolymer of an aromatic vinyl monomer and phenyl methacrylate 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 a styrene / phenyl methacrylate copolymer or a styrene / α-methylstyrene / phenyl methacrylate copolymer.

  In addition, examples of the polymerization method of the fluidity improver (G) comprising a copolymer of an aromatic vinyl monomer and phenyl methacrylate include emulsion polymerization, suspension polymerization, and bulk polymerization. In particular, emulsion polymerization is preferably used. It is done. In addition, the said fluid improvement agent (G) is commercially available, and includes Metablene TP003 manufactured by Mitsubishi Rayon Co., Ltd.

  The blending amount of the fluidity improver (G) composed of a copolymer of an aromatic vinyl monomer and phenyl methacrylate is 2 to 12 parts by weight with respect to 100 parts by weight of the polycarbonate resin (A). If the blending amount is less than 2 parts by weight, the effect of improving the fluidity is inferior, and if the blending amount exceeds 12 parts by weight, the impact strength decreases, which is not preferable. More preferably, it is 3-10 weight part, More preferably, it is 4-8 weight part.

  The blending method of the various blending components (A), (B), (C), (D), (E), (F), and (G) of the present invention is not particularly limited, and any mixer such as a tumbler, These can be mixed by a ribbon blender, a high-speed mixer or the like, and can be easily melt-kneaded by a normal single-screw or twin-screw extruder. Moreover, there is no restriction | limiting in particular also about these compounding orders.

  Furthermore, various heat stabilizers, antioxidants, fillers, mold release agents, ultraviolet absorbers, antistatic agents, softeners, spreading agents are added to the polycarbonate resin composition of the present invention within a range not impairing the effects of the present invention. Additives (epoxy soybean oil, liquid paraffin, etc.), dyes and pigments, additives such as optical brighteners, and other polymers may be blended.

  Examples of the filler include glass fiber, glass bead, glass flake, carbon fiber, talc powder, clay powder, mica, potassium titanate whisker, wollastonite powder, silica powder, and alumina powder.

  Examples of other polymers include polyesters such as polyethylene terephthalate and polybutylene terephthalate; styrene polymers such as polystyrene, high impact polystyrene, ABS resin, and AES resin; polypropylene, and polymers that are usually used after alloying with polycarbonate. .

  EXAMPLES Hereinafter, although an Example demonstrates this invention, this invention is not limited to these Examples. Unless otherwise specified, “%” and “parts” in the examples are based on weight standards.

The raw materials used are as follows.
Polycarbonate resin:
Polycarbonate resin synthesized from bisphenol A and phosgene (Sumitomo Dow Caliber 200-40, viscosity average molecular weight: 16600
(Hereinafter abbreviated as PC)
Titanium oxide:
2230 made by Kronos
Divalent metal sulfate:
Barium sulfate (B55, Sakai Chemical Industry Co., Ltd., primary particle size 0.66 μm)
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:
Sodium paratoluenesulfonate fiber-forming fluoropolymer:
Daikin polyflon FA500
(Polytetrafluoroethylene, hereinafter abbreviated as PTFE)
Fluidity improver:
Styrene / phenyl methacrylate copolymer TP003 manufactured by Mitsubishi Rayon Co., Ltd. (hereinafter abbreviated as fluidity improver)

A method for measuring various evaluation items in the present invention will be described.
(Preparation of resin composition pellets)
In the blending components shown in Tables 2 to 4 below and blending ratios, various blending components are mixed with a tumbler, and the cylinder temperature is set to 280 degrees using a 37 mm diameter twin screw extruder (KTX37 manufactured by Kobe Steel). And kneaded to obtain various pellets.

(Flame retardance)
The obtained pellets were dried at 125 ° C. for 4 hours, and then tested using an injection molding machine (Japan Steel Works J100C-5) at 240 ° C. under an injection pressure of 1600 kg / cm ² (1. 5 mm). The above-mentioned test piece is left in a constant temperature room at 23 ° C. and 50% humidity for 168 hours, and is flame retardant in accordance with UL94 test (flammability test of plastic materials for equipment parts) established by Underwriters Laboratory. Evaluation was performed. The classes according to UL94 are shown in Table 1. V-0 was determined to be acceptable (◯), and the others were unacceptable (x).

The after-flame time is the time that the test piece after the ignition source is moved away from the flame, and the flame is burnt. The drip cotton ignition means that the marking cotton that is 300 mm below the lower end of the test piece is tested. It is determined by whether it is ignited by a drip from a piece.

(Light reflectivity)
The obtained pellets were dried at 125 ° C. for 4 hours, and then an optical measurement test piece (width: 50 mm, width: 300 ° C., injection pressure: 1600 kg / cm ² ) using an injection molding machine (J100C-5 manufactured by Nippon Steel Works). 40 mm long and 2 mm thick). The aforementioned test piece was left in a thermostatic chamber at 23 ° C. and 50% humidity for 48 hours, and the Y value at a wavelength of 400 to 800 nm was measured with a spectrophotometer (CMS-35SP manufactured by Murakami Color Research Laboratory).
A Y value of 94% or more was judged as acceptable (◯), and a value less than 94% was judged as unacceptable (x).

(Impact resistance)
The obtained pellets were dried at 125 ° C. for 4 hours, and then tested using an injection molding machine (Japan Steel Works J100C-5) under the conditions of 280 ° C. and injection pressure 1600 kg / cm ² (ISO standard 179). -2 test piece, thickness 4 mm) was molded and processed into a notched test piece with a tip angle of 0.25R. The test piece was conditioned for 48 hours in a constant temperature room at 23 ° C. and 50% humidity in accordance with ISO 179-1, and then the impact strength was measured with a Charpy impact tester.
A Charpy impact strength of 10 KJ / m ² or more was accepted (◯), and less than 10 KJ / m ² was rejected (x).

(Liquidity)
The obtained pellets were dried at 125 ° C. for 4 hours, and then using an injection molding machine (Japan Steel Works J100C-5) under the conditions of 280 ° C. and injection pressure 1600 kg / cm ² , Archimedes spiral flow mold (width 10 mm, The flow length was measured using a thickness of 10 mm.
A spiral flow length of 150 mm or more was regarded as acceptable (◯), and less than 150 mm as unacceptable (x).

(Formability)
The obtained pellets were dried at 125 ° C. for 4 hours, and then an optical measurement test piece (width: 50 mm, width: 300 ° C., injection pressure: 1600 kg / cm ² ) using an injection molding machine (J100C-5 manufactured by Nippon Steel Works). 40 mm long and 2 mm thick). The surface peeling of the obtained molded specimen, the occurrence of sink marks and unevenness on the surface were evaluated as follows, and the levels of “◯” and “Δ” were regarded as acceptable.
○: Not generated.
Δ: Occurs in 1 to 2 samples out of 5 samples.
X: Occurs in 3 samples or more out of 5 samples.

(Granulation property)
In the blending components shown in Tables 2 to 4 below and blending ratios, various blending components are mixed with a tumbler, and the cylinder temperature is set to 280 degrees using a 37 mm diameter twin screw extruder (KTX37 manufactured by Kobe Steel). The state when the melt-kneaded resin was extruded into a strand shape and processed into a pellet was visually judged. The levels of ○ and △ were accepted.
○: Pelletization was possible without problems.
Δ: Pelletization is slightly difficult.
X: Cannot be pelletized.

*:５試料の合計燃焼時間（秒）

*: Total burning time of 5 samples (seconds)

*:５試料の合計燃焼時間（秒）
ＮＲ：Ｎｏｔ Ｒａｔｉｎｇの略

*: Total burning time of 5 samples (seconds)
NR: Abbreviation for Not Rating

*:５試料の合計燃焼時間（秒）
ＮＲ：Ｎｏｔ Ｒａｔｉｎｇの略

*: Total burning time of 5 samples (seconds)
NR: Abbreviation for Not Rating

  As shown in Table 2, when the configuration of the present invention was satisfied (Examples 1 to 7), all the evaluation items had sufficient performance.

On the other hand, as shown in Tables 3 and 4, when the configuration of the present invention was not satisfied, each case had some drawbacks.
Comparative Example 1 was inferior in light reflectivity when the blending amount of titanium oxide was less than the specified amount.
Comparative Example 2 was a case where the blending amount of titanium oxide was larger than the specified amount, and was inferior in flame retardancy and impact resistance.
Comparative Example 3 was inferior in light reflectivity when the blending amount of the divalent metal sulfate was less than the specified amount.
In Comparative Example 4, the blending amount of the divalent metal sulfate was larger than the specified amount, and the impact resistance was inferior.
Comparative Example 5 was a case where the compounding amount of the silicone compound was less than the specified amount, and was inferior in flame retardancy.
Comparative Example 6 was a case where the compounding amount of the silicone compound was larger than the specified amount, and was inferior in flame retardancy, moldability and impact resistance.
Comparative Example 7 was a case where the blending amount of the fiber-forming fluoropolymer was less than the specified amount and was inferior in flame retardancy.
Comparative Example 8 was a case where the blending amount of the fiber-forming fluoropolymer was larger than the specified amount, and the moldability was poor.
Comparative Example 9 was inferior in fluidity when the blending amount of the fluidity improver was less than the specified amount.
Comparative Example 10 was a case where the blending amount of the fluidity improver was larger than the specified amount, and the flame retardancy and impact resistance were inferior.

Claims (9)

  100 parts by weight of polycarbonate resin (A), 5 to 25 parts by weight of titanium oxide (B), 0.01 to 10 parts by weight of divalent metal sulfate (C), the main chain has a branched structure and the organic functional group contained is aromatic. 0.01-3 parts by weight of a silicone compound (D) consisting of an aromatic group or an aromatic group and a hydrocarbon group (excluding an aromatic group), 0.01-2 parts by weight of an organometallic salt (E) , A fiber-forming fluorine-containing polymer (F) 0.01 to 2 parts by weight, and a fluidity improver (G) 2 to 12 parts by weight made of a copolymer of an aromatic vinyl monomer and phenyl methacrylate. A flame retardant polycarbonate resin composition excellent in light reflectivity.   The flame retardant polycarbonate resin composition excellent in light reflectivity according to claim 1, wherein the divalent metal sulfate (C) is barium sulfate.   The flame retardant polycarbonate resin composition excellent in light reflectivity according to claim 1, wherein the blending amount of the divalent metal sulfate (C) is 0.1 to 5 parts by weight.   The amount of the 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 the aromatic group) is a polycarbonate resin. (A) It is 0.02-2 weight part per 100 weight part, The flame-retardant polycarbonate resin composition excellent in the light reflectivity of Claim 1 characterized by the above-mentioned.   The flame retardant polycarbonate resin composition having excellent light reflectivity according to claim 1, wherein the organic metal salt (E) is a metal salt of an aromatic sulfonic acid or a metal salt of a perfluoroalkanesulfonic acid. .   The flame-retardant polycarbonate resin composition having excellent light reflectivity according to claim 1, wherein the fiber-forming fluorine-containing polymer (F) is polytetrafluoroethylene.   The flame retardant polycarbonate resin composition excellent in light reflectivity according to claim 1, wherein the fluidity improver (G) is a styrene / phenyl methacrylate copolymer or a styrene / α-methyl styrene / phenyl methacrylate copolymer.   A molded product formed by using the flame-retardant polycarbonate resin composition excellent in light reflectivity according to any one of claims 1 to 6.   A light reflecting plate for a liquid crystal frame or a lamp holder formed by using the flame retardant polycarbonate resin composition having excellent light reflectivity according to any one of claims 1 to 6.