JP2852201B2 - Flame retardant polycarbonate resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polycarbonate resin composition, and more particularly to a polycarbonate resin composition having excellent flame retardancy and excellent color tone stability, steam resistance, heat resistance stability and the like.

[0002]

BACKGROUND OF THE INVENTION Polycarbonate resins are excellent in mechanical strength (particularly, impact resistance), electrical properties, transparency, etc., and are used as glass substitute materials and engineering plastics in OA equipment, electric and electronic equipment fields, automobile fields, It is widely used in various fields such as the construction field. Among these fields of use, there are fields requiring a high degree of flame retardancy, mainly in the fields of OA equipment and electric / electronic equipment. The polycarbonate resin has a high oxygen index among various thermoplastic resins, and generally has self-extinguishing properties.

[0003] However, in order to satisfy safety requirements in the OA equipment, electric / electronic equipment fields, and other various applications, there is a strong demand for a resin composition having further improved flame retardancy. Further, there is a demand for not only increasing the flame retardancy but also further improving the color tone stability, steam resistance, heat resistance stability, and the like of the molded product.

[0004]

2. Description of the Related Art Examples of blending a metal salt-based flame retardant with the aim of improving the flame retardancy of a polycarbonate resin include:
JP-B-47-40445 and JP-B-57-28
No. 425 is known. Tokiko Sho 47-
No. 40445 discloses a method for producing a polycarbonate, which comprises adding a perfluoro-alkali- or -ammonium sulfonate having about 4 to 8 carbon atoms to a polycarbonate as a flame retardant to prepare a flame-retarded polycarbonate resin. What you get.

In the flame-retardant polycarbonate composition described in JP-B-57-28425, substituted and unsubstituted metal salts of aliphatic and olefin sulfonic acids and mixtures thereof are added as metal salt-based flame retardants. ing. The metal salt used here is an alkali metal or alkaline earth metal or a mixture of these metal salts.

[0006]

However, the above-mentioned metal salt-based flame retardants improve the flame retardancy of the polycarbonate resin. However, since they contain a metal (ion), the thermal stability when the molding machine stays is low. Poor, deterioration in color tone of polycarbonate resin such as increase in ΔYI (yellow index) during molding,
There were problems with molded articles such as a decrease in molecular weight. As for the steam resistance, Δhaze (haze value) is large, which causes a problem in the appearance of a molded product.

Accordingly, an object of the present invention is to provide a polycarbonate resin composition which is excellent in flame retardancy and excellent in color tone stability, steam resistance, heat resistance stability and the like of a molded product under the above-mentioned conditions. I do.

[0008]

Means for Solving the Problems In order to achieve the above object, the present inventors have developed a polycarbonate resin composition containing various metal salt (salt) flame retardants and a specific compound in various ratios. Flammability and other physical properties were examined. As a result, they have found that a polycarbonate resin composition having desired properties can be obtained by adding a salt-based flame retardant and a specific compound to a polycarbonate at a specific ratio, and completed the present invention.

That is, the present invention relates to (A) 100 parts by weight of an aromatic polycarbonate (PC), and (B) an amount of the formula (IV) corresponding to a phosphorus content of 2 to 200 ppm.

Embedded image (Wherein, R ¹ and R ² each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an alkyl-substituted cycloalkyl group, an aryl group or an alkyl-substituted aryl group.) A salt-based flame retardant containing a phyll compound and (C) an amount of a salt-based flame retardant corresponding to an alkali metal and / or alkaline earth metal content of 5 to 1000 ppm, and based on the phosphorus content in the pentaerythritol phosphite compound An object of the present invention is to provide a flame-retardant polycarbonate resin composition, wherein the content ratio of alkali metal and / or alkaline earth metal [(C) / (B)] is 30 or less.

Hereinafter, the present invention will be described in detail. First, the components (A) to (C) of the resin composition of the present invention will be described.

(A) Polycarbonate Resin (PC) As the aromatic polycarbonate (PC) which is the component (A) constituting the resin composition of the present invention, various ones can be mentioned, and the following general formula (I) is preferable. Is a polymer having a repeating unit having the structure represented by

[0012]

Embedded image [In the formula, X ¹ and X ² may be the same or different and each is a halogen atom (eg, chlorine, bromine, fluorine, iodine) or a C ₁ -C ₈ alkyl group (eg, a methyl group , Ethyl group, propyl group, n-butyl group,
i-butyl group, amyl group, i-amyl group, hexyl group, etc.). a and b represent the number of substitutions of X ¹ and X ² , respectively, and are each 0 or an integer of 1 to 4. When a and / or b is an integer of 2 to 4, a plurality of X ¹ and / or X ² may be the same or different. Y represents a single bond; C ₁ -C ₈ alkylene group (e.g., methylene group, ethylene group, propylene group, butylene group, Penteriren group, hexylene group, etc.), C ₂ ~
C ₈ alkylidene group (e.g., ethylidene group, i- propylidene group, etc.), C ₅ -C ₁₅ cycloalkylene group (e.g., a cyclopentylene group, a cyclohexylene group, etc.), C
₅ -C ₁₅ cycloalkylidene group (e.g., cyclopentylidene group, cyclohexylidene group, etc.); - S -, - SO
_2- , -O- or -CO- bond; or formula (II-1)

Embedded image Or formula (II-2)

Embedded image The bond represented by is shown. ]

The above polymer is usually represented by the general formula (III)

Embedded image (Wherein X ¹ , X ² , a, b and Y are as defined above), and phosgene;
It can be easily produced by reacting with a carbonate precursor such as a carbonate compound.

That is, for example, by reacting a dihydric phenol with a carbonate precursor such as phosgene in a solvent such as methylene chloride in the presence of a known acid acceptor or molecular weight regulator, or in the presence or absence of a solvent. It can be produced by a transesterification reaction of a dihydric phenol with a carbonate precursor such as a carbonate compound in the presence.

As the dihydric phenol represented by the general formula (III), various ones can be mentioned.
-Bis (4-hydroxyphenyl) propane [bisphenol A] is preferred. Examples of the dihydric phenol other than bisphenol A include bis (4-
(Hydroxyphenyl) alkane, 1,1- (4-hydroxyphenyl) methane, 1,1- (4-hydroxyphenyl) ethane, 4,4′-dihydroxydiphenyl, bis (4-hydroxyphenyl) cycloalkane, bis (4 -Hydroxyphenyl) oxide, bis (4-hydroxyphenyl) sulfide, bis (4-hydroxyphenyl) sulfone, bis (4-hydroxyphenyl) sulfoxide, bis (4-hydroxyphenyl) ether, bis (4-hydroxyphenyl) ketone And halogenated bisphenols such as bis (3,5-dibromo-4-hydroxyphenyl) propane and bis (3,5-dichloro-4-hydroxyphenyl) propane. In addition, examples of the dihydric phenol include hydroquinone. These dihydric phenols are
Each may be used alone, or two or more kinds may be used in combination.

Examples of the carbonate compound include diaryl carbonates such as diphenyl carbonate; and dialkyl carbonates such as dimethyl carbonate and diethyl carbonate.

In the polymerization of the polycarbonate as the component (A) of the present invention, a molecular weight modifier can be used. As the molecular weight regulator, those usually used for polymerization of carbonate may be used, and various types can be used. Specifically, for example, phenol which is a monohydric phenol, p-cresol, p-tert-butylphenol, p-tert-octylphenol, p-
Cumylphenol, bromophenol, tribromophenol, nonylphenol and the like can be mentioned.

The aromatic polycarbonate which is the component (A) of the resin composition of the present invention may be a homopolymer using one of the above-mentioned dihydric phenols or a copolymer using two or more of the above-mentioned dihydric phenols. You may. Further, it may be a thermoplastic random branched polycarbonate resin obtained by using a polyfunctional aromatic compound in combination with the dihydric phenol.

Further, a polycarbonate-polyorganosiloxane copolymer comprising an organosiloxane block having a number average degree of polymerization of 5 or more may be used.

Further, a mixture of two or more of these various polycarbonate resins may be used.

The viscosity-average molecular weight of the polycarbonate resin (A) used in the present invention is 10,000 to 100,0 from the viewpoint of mechanical strength and moldability.
00, especially 15,000 to 40,000.
A value of 0 is preferred.

Commercially available aromatic polycarbonates suitably used as component (A) of the resin composition of the present invention include, for example, Tafflon FN3000A and FN2500.
A, FN2200A, FN1900A, FN1500A
(Trade name, manufactured by Idemitsu Petrochemical Co., Ltd.).

(B) Pentaerythritol phosphite
Compound (PEP) The pentaerythritol phosphite compound (PEP), which is the component (B) added to the composition of the present invention, is a phosphorus-based antioxidant and, at the same time, a salt-based compound of the component (C) described below. It is considered to have a function to include the alkali metal and / or alkaline earth metal contained in the flame retardant to deactivate the catalytic action.

The pentaerythritol phosphite compound (PEP) used in the present invention has the general formula (I)
V)

Embedded image (Wherein, R ¹ and R ² each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an alkyl group-substituted cycloalkyl group, an aryl group or an alkyl group-substituted aryl group). . Specifically, a compound represented by the following structural formula can be exemplified.

[0025]

Embedded image

[0026]

Embedded image

[0027]

Embedded image

[0028]

Embedded image and

[0029]

Embedded image

Of the above compounds, commercially available pentaerythritol phosphite compounds (PEP), ADK STAB PEP-36, PEP-24G and PEP-8
(All manufactured by Asahi Denka Kogyo KK) (Each compound (IV
a), (IVb) and (IVe) are preferred), and ADK STAB PEP-36 is particularly preferred.

The pentaerythritol phosphite compound (PEP) in the present invention may be used alone or in combination of two or more.

(C) Salt-Based Flame Retardant In the present invention, the salt-based flame retardant which is a component (C) for imparting flame retardancy to a polycarbonate resin includes an organic alkali metal salt and / or an organic alkaline earth metal salt. Used. The organic alkali metal salt and the organic alkaline earth metal salt include various ones, and are an alkali metal salt or an alkaline earth metal salt of an organic acid or an organic acid ester having at least one carbon atom.

The salt-based flame retardants in the present invention may be used alone or in combination of two or more.

Here, the organic acid or organic acid ester is an organic sulfonic acid, an organic carboxylic acid, an organic phosphoric acid ester, or the like. That is, in the flame retardant (C), the organic sulfonic acid and the organic carboxylic acid form a metal salt, and the organic phosphoric acid ester forms a metal salt. On the other hand, alkali metals that form metal salts with these organic acids or organic acid esters are sodium, potassium, lithium, cesium and the like, and alkaline earth metals are magnesium, calcium, strontium and barium. In particular, alkali metal salts such as sodium, potassium and cesium are preferably used. Also,
The salt of the organic acid may be replaced by a halogen such as fluorine, chlorine, bromine.

Among the above various organic alkali metal salts and alkaline earth metal salts, for example, in the case of organic sulfonic acid,
General formula (V) (C _k F _{2k + 1} SO ₃ ) _s M (V) (where k represents an integer of 1 to 10, and M represents an alkali metal such as lithium, sodium, potassium, cesium, or magnesium , Calcium, strontium, barium and the like, and s represents the valence of M.) An alkali metal salt or an alkaline earth metal salt of perfluoroalkanesulfonic acid represented by These compounds include, for example, JP-B-47-4
The one described in Japanese Patent No. 0445 corresponds to this.

In the alkali metal salt or alkaline earth metal salt of perfluoroalkanesulfonic acid represented by the above general formula (V), the perfluoroalkanesulfonic acid moiety is, for example, perfluoromethanesulfonic acid or perfluoroethanesulfonic acid. , Perfluoropropanesulfonic acid, perfluorobutanesulfonic acid, perfluoromethylbutanesulfonic acid, perfluorohexanesulfonic acid, perfluoroheptanesulfonic acid, those composed of perfluorooctanesulfonic acid, etc. The potassium salt of the sulfonic acid is preferred.

Other examples include 2,5-dichlorobenzenesulfonic acid, 2,4,5-trichlorobenzenesulfonic acid, diphenylsulfone-3-sulfonic acid, diphenylsulfone-3,3′-disulfonic acid, and naphthalenetrisulfonic acid. Examples thereof include alkali metal salts and alkaline earth metal salts of organic sulfonic acids.

Examples of the alkali metal salt or alkaline earth metal salt of an organic carboxylic acid include perfluoroformic acid, perfluoromethanecarboxylic acid, perfluoroethanecarboxylic acid, perfluoropropanecarboxylic acid, and the like.
Alkali metal salts or alkaline earth metal salts such as perfluorobutanecarboxylic acid, perfluoromethylbutanecarboxylic acid, perfluorohexanecarboxylic acid, perfluoroheptanecarboxylic acid, and perfluorooctanecarboxylic acid are used. The kind of the alkali metal or the alkaline earth metal is the same as described above.

Further, the alkali metal salt or alkaline earth metal salt of an organic phosphate is represented by the general formula (VI):

Embedded image (Wherein, R ³ and R ⁴ each independently represent an alkyl group, a halogen-substituted alkyl group, an aryl group or a halogen-substituted aryl group, and they may be bonded to each other directly or via an alkylene group) May be combined with each other to form one condensed ring.) In which the hydrogen atom in the hydroxyl group of the organic phosphate ester is substituted with an alkali metal or an alkaline earth metal.

Examples of such alkali metal salts or alkaline earth metal salts of organophosphates include (p)
Alkali metal salts or alkaline earth metal salts such as -t-butylphenyl) phosphate, di (p-cumylphenyl) phosphate and di (brominated phenyl) phosphate.

Next, the mixing ratio of each component constituting the resin composition of the present invention will be described. In the polycarbonate resin composition of the present invention, the pentaerythritol phosphite compound (PEP) as the component (B) has a phosphorus content of 2 to 200 ppm, preferably 100 parts by weight, based on 100 parts by weight of the polycarbonate resin as the component (A). 5-10
It is blended in an amount corresponding to 0 ppm. 2p phosphorus content
If it is less than pm, the effect of improving color tone stability and steam resistance cannot be obtained, and if it exceeds 200 ppm, the steam resistance decreases.

The salt-based flame retardant as the component (C) has an alkali metal and / or alkaline earth metal content of 5 to 1000 ppm, preferably 20 to 500 ppm, based on 100 parts by weight of the polycarbonate resin as the component (A).
In an amount corresponding to When the alkali metal and / or alkaline earth metal content is less than 5 ppm,
The required flame retardancy of the obtained resin composition cannot be obtained, and even if it exceeds 1000 ppm, further improvement in flame retardancy cannot be obtained.

The ratio [(C) / (C) / (C) of the alkali metal and / or alkaline earth metal content in the salt-based flame retardant and the phosphorus content in the (B) pentaerythritol phosphite compound (PEP). B)] must be 30 or less, preferably 20 or less. (C) /
If (B) exceeds 30, the alkali metal and / or alkaline earth metal in the salt-based flame retardant increases, and the catalytic action cannot be suppressed, and only the conventional metal salt-based flame retardant is added. Therefore, the problem of the flame retarded polycarbonate resin cannot be solved.

The resin composition of the present invention may optionally contain optional components in addition to the components (A) to (C) for the purpose of improving fluidity, impact resistance, appearance, preventing static charge, improving weather resistance, and improving rigidity. Can be added. As optional components that can be added to the resin composition of the present invention, for example, an external lubricant such as an aliphatic carboxylic acid ester type or paraffin type, a release agent, an antistatic agent,
Examples thereof include a polyamide polyether block copolymer (permanent antistatic property imparting agent), a benzotriazole-based or benzophenone-based ultraviolet absorber, a hindered amine-based light stabilizer, a glass fiber for improving rigidity, a coloring agent, and the like. The amount of the optional component is not particularly limited as long as the properties of the resin composition of the present invention are maintained.

Next, a method for producing the resin composition of the present invention will be described. In the resin composition of the present invention, the above components (A), (B) and (C) are blended in the above proportions, and further, various optional additives used as needed are blended in an appropriate proportion and kneaded. Is obtained by The compounding and kneading at this time are usually used equipment, for example, a ribbon blender, a Henschel mixer, a Banbury mixer,
It can be performed by a method using a drum tumbler, a single screw extruder, a twin screw extruder, a co-kneader, a multi-screw extruder, or the like. The heating temperature at the time of kneading is appropriately selected usually in the range of 240 to 340 ° C.

[0046]

The present invention will be described more specifically with reference to examples and comparative examples. Examples 1 to 6 and Comparative Examples 1 to 5 The components were blended at the ratios shown in Table 1 below and supplied to an extruder (model name: VS40, manufactured by Tanabe Plastic Machinery Co., Ltd.).
The mixture was kneaded at 320 ° C. and pelletized.

After the obtained pellets were dried at 80 ° C. for 12 hours, they were injection-molded at a molding temperature of 320 ° C. using an injection molding machine (model name: IS25EP, manufactured by Toshiba Corporation) to obtain 35 m
An mx 25 mm x 3 mm test piece (used for measuring haze and YI) and a 126 mm x 13 mm x 3 mm test piece (used for limiting oxygen index measurement) were obtained.

The performance of the obtained test pieces was evaluated by various tests, and the results are shown in Table 1. The materials used and the performance evaluation methods are shown after Table 1.

[0049]

[Table 1]

The numerical values in the composition column in the table indicate parts by weight, and the numerical values in parentheses in the component (B) and the component (C) indicate the content of phosphorus and the content of alkali metal and / or alkaline earth metal in ppm, respectively. Indicated by

In Table 1, each symbol indicates the following.

(A) PC: polycarbonate (trade name:
Teflon FN3000A, manufactured by Idemitsu Petrochemical Co., molecular weight 30000)

(B) PEP (pentaerythritol phosphite compound) PEP-36 (trade name, manufactured by Asahi Denka Co., Ltd.), structural formula

Embedded image PEP-8 (trade name, manufactured by Asahi Denka Co., Ltd.), structural formula

Embedded image PEP-24G (trade name, manufactured by Asahi Denka Co., Ltd.), structural formula

Embedded image

(External component of the present invention): Phosphorus antioxidant Irgafos 168 (trade name, manufactured by Ciba Geigy), structural formula

Embedded image Sumilizer-TNP (trade name, manufactured by Sumitomo Chemical Co., Ltd.), structural formula

Embedded image

These non-inventive components do not have a pentaerythritol structure and are, therefore, phosphorus-based antioxidants not contained in the pentaerythritol phosphite (PEP) which is the component (B). )) It was used for comparison with a pentaerythritol phosphite compound as a component.

(C) Salt-based flame retardant potassium perfluorobutanesulfonate (trade name: Megafac F114, manufactured by Dainippon Ink and Chemicals, Inc.), structural formula: C ₄ F ₉ SO ₃ K diphenylsulfone-3-sulfonic acid Potassium (trade name: KSS, manufactured by UCB), structural formula

Embedded image

[Performance Evaluation Method] ΔHaze (Haze Value) : Based on JIS K7105 (using a steam tester, 120 ° C., 24 hours, 3 mm thick test piece), unit:% ΔHaze value is usually the haze value of the resin. It is a value indicating the degree. In this test, the degree of fogging caused by applying steam to the resin (as an accelerated aging test) is used as an indicator of steam resistance performance. The lower the value, the higher the steam resistance. I do. However, Δ haze is a value that should be relatively evaluated in consideration of other performances, and the range of values required according to the application of the product is also different, and it can be said that a specific range of values is generally preferable. Not something.

YI (Yellow Index) : JIS
According to K7105 (YI was measured before and after the sample was kept in a molding machine at 340 ° C. for 20 minutes, and the initial YI value and Y after the stay were measured.
It was shown as an I value. The higher the YI value, the stronger the yellowing of the resin, and the greater the difference between the initial YI and the post-retention YI,
Indicates poor color stability.

Critical oxygen index : Based on JIS K7201 (test conditions: use of a test piece of 126 mm × 13 mm × 3 mm) The critical oxygen index is the minimum oxygen required for the test material to maintain combustion under the above test conditions. It is a value indicating the concentration by volume% in air. The larger the value, the higher the flame retardancy of the material. The flame-retardant performance of a polycarbonate resin is usually 30 to 4 depending on the purpose of use.
It is satisfied at about 0%.

From the results shown in Table 1, it can be seen that the compositions of Examples 1 to 6, which are the resin compositions of the present invention, are excellent not only in flame retardancy but also in steam resistance and color stability. That is, the compositions of Examples 1 to 6 in which the pentaerythritol phosphite compound (PEP) of the component (B) and the salt-based flame retardant of the component (C) were added to the polycarbonate of the component (A) had a limiting oxygen index of 34. ~ 37, high flame retardancy. Further, Δ haze was suppressed low by adding potassium perfluorobutanesulfonate, and when adding a pentaerythritol phosphite compound (PEP) by adding potassium diphenylsulfon-3-sulfonate,
When C / B = 30 or less, there is an effect, and when C / B = 20 or less, there is further effect and steam resistance is excellent. Further, since the initial YI is as small as 3.4 to 4.6 and the ΔYI (that is, the difference between the initial YI and the YI after staying) is small, the color tone and its stability are excellent.

On the other hand, it can be seen that the resin compositions of Comparative Examples 1 to 5 satisfy the flame retardancy, but cannot improve all of the other properties aimed at by the present invention.

That is, the resin composition of Comparative Example 1 did not contain the pentaerythritol phosphite compound (PEP), which is the component (B) of the present invention, and other phosphorus-based antioxidants, and had a Δ haze value of 90, which is inferior in steam resistance. Furthermore, the initial YI is as high as 6.7, and there is a problem with the color tone.

The resin composition of Comparative Example 2 was prepared according to the present invention (B)
It contains a phosphorus-based antioxidant other than the pentaerythritol phosphite compound (PEP) as a component. The haze value is as high as 90, the steam resistance is inferior, and the initial YI value is 5.1, whereas the YI value after stagnation is as large as 11.5, and the color tone increases due to heating during molding. And the color stability is poor.

As in Comparative Example 3 of the resin composition of Comparative Example 3, an antioxidant other than the pentaerythritol phosphite compound (PEP) as the component (B) of the present invention was added. The haze value is as low as 3 and excellent in steam resistance, but the initial YI value is 5.0,
The I value is 15.0, which is three times, and the color tone stability is inferior.

The resin composition of Comparative Example 4 was prepared according to the present invention (B)
The addition amount of the pentaerythritol phosphite compound (PEP) as the component is larger than the compounding range of the present invention (the amount corresponding to the phosphorus content of 2 to 200 ppm based on 100 parts by weight of the polycarbonate as the component (A)). Is what is being done. If the amount of the pentaerythritol phosphite compound (PEP) is too large, the color tone stability is excellent, but the Δ haze value is as large as 90, and the steam resistance is reduced.

In the resin composition of Comparative Example 5, C / B was 30
Due to the excess salt-based flame retardant, haze is large,
The steam resistance decreases, the initial YI and the post-retention YI are large, and the color tone stability is poor.

[0067]

According to the present invention, by blending (A) an aromatic polycarbonate (PC), (B) a pentaerythritol phosphite compound (PEP) and (C) a salt-based flame retardant in a specific ratio, A polycarbonate resin composition having excellent flame retardancy and excellent color tone stability, steam resistance, heat stability and the like has been provided.

Claims (9)

(57) [Claims] (A) Aromatic polycarbonate (PC)
(B) Phosphorus content of 2 to 200 pp with respect to 100 parts by weight
An amount of the formula (IV) corresponding to m (Wherein, R ¹ and R ² each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an alkyl-substituted cycloalkyl group, an aryl group or an alkyl-substituted aryl group.) A salt-based flame retardant containing a phyll compound and (C) an amount of a salt-based flame retardant corresponding to an alkali metal and / or alkaline earth metal content of 5 to 1000 ppm, and based on the phosphorus content in the pentaerythritol phosphite compound A flame-retardant polycarbonate resin composition, wherein the content ratio of alkali metal and / or alkaline earth metal [(C) / (B)] is 30 or less. (B) The pentaerythritol phosphite compound represented by the formula (IV) is represented by the following formula: Embedded image Embedded image Embedded image And The resin composition according to claim 1, which is selected from the group consisting of: 3. The salt-based flame retardant (C) is selected from the group consisting of alkali metal salts and / or alkaline earth metal salts of organic sulfonic acids, organic carboxylic acids and organic phosphoric esters having at least one carbon atom. Claim 1
3. The resin composition according to item 1. 4. The resin composition according to claim 3, wherein (C) the salt-based flame retardant is an alkali metal salt and / or an alkaline earth metal salt of an organic sulfonic acid. (C) a salt-based flame retardant represented by the general formula (V): (C _k F _{2k + 1} SO ₃ ) _s M (V) (where k is an integer of 1 to 10, and M is an alkali) A metal or an alkaline earth metal, and s represents a valence of M.) The perfluoroalkanesulfonic acid is an alkali metal salt and / or an alkaline earth metal salt. 3. The resin composition according to item 1. 6. The salt-based flame retardant (C) is 2,5-dichlorobenzenesulfonic acid, 2,4,5-trichlorobenzenesulfonic acid, diphenylsulfone-3-sulfonic acid,
The resin composition according to claim 4, wherein the resin composition is selected from the group consisting of alkali metal salts and alkaline earth metal salts of diphenylsulfone-3,3'-disulfonic acid and naphthalenetrisulfonic acid. 7. (A) Aromatic polycarbonate (PC)
(B) Phosphorus content of 5 to 100 pp with respect to 100 parts by weight
The resin composition according to claim 1, comprising a pentaerythritol phosphite compound in an amount corresponding to m. 8. (A) Aromatic polycarbonate (PC)
The resin composition according to claim 1, further comprising (C) a salt-based flame retardant in an amount corresponding to an alkali metal and / or alkaline earth metal content of 20 to 500 ppm with respect to 100 parts by weight. 9. The ratio [(C) / (B)] of the alkali metal and / or alkaline earth metal content in the salt-based flame retardant to the phosphorus content in the pentaerythritol phosphite compound is 20 or less. The resin composition according to claim 1, wherein: