JP2001335684A - Flame-retardant resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flame-retardant resin composition not containing an organic compound having halogen, phosphorus or nitrogen atom, capable of exhibiting excellent flame-retardant effect and producible using raw materials of a low cost. SOLUTION: This flame-retardant resin composition comprises (A) 100 pts.wt. of a polycarbonate-based resin, and (B) 0.1 to 50 pts.wt. of a low melting glass having a softening point existing in the range of 450 to 700 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a halogen, phosphorus,
The present invention relates to a highly flame-retardant novel polycarbonate-based resin composition which does not contain an organic compound containing an element such as nitrogen and does not generate toxic gas during combustion.

[0002]

2. Description of the Related Art Polycarbonate resins have mechanical properties,
It has excellent heat resistance and transparency, and is widely used as a material for electric and electronic parts, a material for automobile parts, a material for construction, a sheet material, a food container material and the like.

[0003] When used in the above-mentioned electronic and electric fields, strict flame retardancy standards are set for safety considerations in the event of fire, and they comply with UL-94 V-0 (US Underwriters Laboratory Standard). In many cases, such high flame retardancy is required. In order to satisfy the flame retardancy standards, various flame retardants such as halogen-based and phosphorus-based have been added to polycarbonate-based resins.

However, in recent years, halogen-based flame retardants,
With increasing interest in environmental issues, especially in Europe, related to flame retardants containing chlorine or bromine,
Various developments of non-halogen flame-retardant resin compositions containing no organic compound containing chlorine or bromine have been studied.

Examples of the non-halogen flame-retardant polycarbonate resin include a resin composition containing a phosphoric acid ester, a phosphorus-containing compound such as red phosphorus, and a metal hydroxide such as aluminum hydroxide and magnesium hydroxide. In addition, when a resin composition containing a phosphorus-containing compound is used, there is a problem that heat resistance and strength are reduced, and when a metal hydroxide is used, there is a problem that the resin is decomposed.

On the other hand, as one of the techniques for making a resin flame-retardant, a method of adding a low-melting glass to the resin is known. For example, J. Fire Science, 3, 4
No. 15 (1985), a PVC resin blended with a low-melting glass (this low-melting glass refers to a glass material that melts or softens at a temperature of about 600 ° C. or lower as described in this document). Are disclosed in Japanese Patent Application Laid-Open No. 60-1 / 1985.
3058 and JP-A-60-133059 disclose PP, PES, PE, PPS resins and the like containing low melting point glass. However, these reports all have low flame retardancy, and a large amount of low-melting glass must be added to obtain sufficient flame retardancy. Also, JP-A-11-2365
No. 9 discloses a HIPS / PPE resin blended with a low-melting glass having a specific range of thermophysical properties. In this case, too, a large amount of 20 parts by weight or more can provide only an effect of self-extinguishing. Not been. Therefore, in the prior art, there was no resin composition satisfying the UL-94 standard by blending a substantially small amount of low melting point glass.

[0007]

DISCLOSURE OF THE INVENTION In view of the above situation, the present invention provides a novel polycarbonate resin composition which is highly flame-retarded without containing an organic compound containing elements such as halogen, phosphorus and nitrogen. It is intended to provide.

[0008]

Accordingly, the present inventors have focused on a flame-retardant resin composition containing a low-melting glass, and have studied the hot behavior of the low-melting glass and the flame-retardant properties of a polycarbonate resin. As a result of intensive studies, the present inventors have found that a resin composition containing a polycarbonate resin and a substantially small amount of a low-melting glass having specific hot physical properties exhibits high flame retardancy, and completed the present invention.

That is, the present invention provides a flame-retardant resin composition containing (A) 100 parts by weight of a polycarbonate resin and (B) 0.1 to 50 parts by weight of a low-melting glass having a softening point in the range of 450 to 700 ° C. object.

[0010] In a preferred embodiment, further,
(C) The flame-retardant resin composition according to claim 1, which contains 0.005 to 1 part by weight of a fluororesin.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.

The polycarbonate resin (A) used in the present invention is obtained by reacting a phenol compound having a valency of 2 or more with phosgene or a carbonic acid diester such as diphenyl carbonate.

The dihydric or higher phenol compound is a dihydric phenol, for example, 2,2-bis (4
-Hydroxyphenyl) propane [commonly known as bisphenol A], bis (4-hydroxyphenyl) methane; bis (4-hydroxyphenyl) phenylmethane; bis (4
-Hydroxyphenyl) naphthylmethane; bis (4-hydroxyphenyl)-(4-isopropylphenyl) methane; bis (3,5-dimethyl-4-hydroxyphenyl) methane; 1,1-bis (4-hydroxyphenyl)
Ethane; 1-naphthyl-1,1-bis (4-hydroxyphenyl) ethane; 1-phenyl-1,1-bis (4-
1,2-bis (4-hydroxyphenyl) ethane; 2-methyl-1,1-bis (4-hydroxyphenyl) propane; 2,2-bis (3,5-dimethyl-4-hydroxy) Phenyl) propane; 1-ethyl-1,1-bis (4-hydroxyphenyl) propane; 2,2-bis (3-methyl-4-hydroxyphenyl) propane; 2,2-bis (3-fluoro-4- Hydroxyphenyl) propane; 1,1-bis (4-hydroxyphenyl) butane; 2,2-bis (4
1,4-bis (4-hydroxyphenyl) butane; 2,2-bis (4-hydroxyphenyl) pentane; 4-methyl-2,2-bis (4-hydroxyphenyl) pentane; 2,2-bis (4-hydroxyphenyl) hexane; 4,4-bis (4-hydroxyphenyl) heptane; 2,2-bis (4-hydroxyphenyl) nonane; 1,10-bis (4-hydroxyphenyl) decane ; 1,1-bis (4
-Hydroxyphenyl) -3,3,5-trimethylcyclohexane; 2,2-bis (4-hydroxyphenyl)
Dihydroxydiarylalkanes such as -1,1,1,3,3,3-hexafluoropropane, 1,1-bis (4-hydroxyphenyl) cyclohexane; 1,1-
Dihydroxydiarylcycloalkanes such as bis (4-hydroxyphenyl) cyclodecane; bis (4-hydroxyphenyl) sulfone; dihydroxydiarylsulfones such as bis (3,5-dimethyl-4-hydroxyphenyl) sulfone; Dihydroxydiaryl ethers such as bis (3,5-dimethyl-4-hydroxyphenyl) ether, 4,4′-dihydroxybenzophenone;
Dihydroxydiarylketones such as 3,3 ′, 5,5′-tetramethyl-4,4′-dihydroxybenzophenone, bis (4-hydroxyphenyl) sulfide;
Bis (3-methyl-4-hydroxyphenyl) sulfide; dihydroxydiaryl sulfides such as bis (3,5-dimethyl-4-hydroxyphenyl) sulfide; dihydroxydiaryl sulfoxides such as bis (4-hydroxyphenyl) sulfoxide; , 4 '
Dihydroxydiphenyls such as -dihydroxydiphenyl; and dihydroxyarylfluorenes such as 9,9-bis (4-hydroxyphenyl) fluorene. Further, in addition to the dihydric phenols, dihydroxybenzenes such as hydroquinone, resorcinol, and methylhydroquinone; dihydroxynaphthalenes such as 1,5-dihydroxynaphthalene; and 2,6-dihydroxynaphthalene are also included. Among these,
2,2-bis (4-hydroxydiphenyl) propane,
Bis (4-hydroxyphenyl) methane, bis (4-hydroxyphenyl) phenylmethane, bis (3,5-dimethyl-4-hydroxyphenyl) methane, 1-phenyl-1,1-bis (4-hydroxyphenyl) ethane ,
2,2-bis (3,5-dimethyl-4-hydroxyphenyl) propane, 1,1-bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane, bis (4-hydroxyphenyl) sulfone, 4,4'-Dihydroxybenzophenone is preferred from the viewpoint of the moldability and flame retardancy of the flame-retardant thermoplastic resin composition of the present invention, the mechanical strength of the obtained molded article, and the flame retardancy. These dihydric phenols and the like may be used alone or in combination of two or more.

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

The polycarbonate resin (A) may use a branching agent for generating a branching property, if necessary. Examples of the branching agent include phloroglucin, melitic acid, trimellitic acid, trimellitic acid chloride, trimellitic anhydride, gallic acid, n-propyl gallate, protocatechuic acid, pyromellitic acid, pyromellitic dianhydride, α-resorcinic acid, β-resorcinic acid, resorcinaldehyde, trimethyl chloride, isatin bis (o-cresol), trimethyl trichloride, 4-chloroformylphthalic anhydride, benzophenonetetracarboxylic acid; 2,4,4′-trihydroxybenzophenone; 2,2 ', 4,4'-tetrahydroxybenzophenone;2,4,4'-trihydroxyphenylether;2,2',4,4'-tetrahydroxyphenylether;2,4,4'-trihydroxydiphenyl-2-Propane;2,2'-bis (2,4-dihydroxy Propane; 2,2 ', 4,4'-tetrahydroxydiphenylmethane;2,4,4'-trihydroxydiphenylmethane; 1- [α-methyl-α- (4′-dihydroxyphenyl) ethyl] -3- [α ', Α'-bis (4 "-hydroxyphenyl) ethyl] benzene; 1
-[Α-methyl-α- (4′-dihydroxyphenyl)
Ethyl] -4- [α ′, α′-bis (4 ″ -hydroxyphenyl) ethyl] benzene; α, α ′, α ″ -tris (4-hydroxyphenyl) -1,3,5-triisopropylbenzene; 2,6-bis (2-hydroxy-5 '
-Methylbenzyl) -4-methylphenol; 4,6-
Dimethyl-2,4,6-tris (4'-hydroxyphenyl) -2-heptene; 4,6-dimethyl-2,4,6
-Tris (4'-hydroxyphenyl) -2-heptane; 1,3,5-tris (4'-hydroxyphenyl)
Benzene; 1,1,1-tris (4-hydroxyphenyl) ethane; 2,2-bis [4,4-bis (4′-hydroxyphenyl) cyclohexyl] propane; 2,6-
Bis (2'-hydroxy-5'-isopropylbenzyl) -4-isopropylphenol; bis [2-hydroxy-3- (2'-hydroxy-5'-methylbenzyl) -5-methylphenyl] methane; bis [2 -Hydroxy-3- (2'-hydroxy-5'-isopropylbenzyl) -5-methylphenyl] methane; tetrakis (4-hydroxyphenyl) methane; tris (4-hydroxyphenyl) phenylmethane; 2 ', 4', 7-trihydroxyflavan; 2,4,4-trimethyl-
2 ', 4', 7-trihydroxyflavan; 1,3-bis (2 ', 4'-dihydroxyphenylisopropyl)
Benzene; tris (4'-hydroxyphenyl) -amyl-s-triazine;

In some cases, the polycarbonate resin (A) may be a polycarbonate-polyorganosiloxane copolymer comprising a polycarbonate part and a polyorganosiloxane part. At this time, the degree of polymerization of the polyorganosiloxane portion is preferably 5 or more.

As the terminal terminator at the time of polymerization of the polycarbonate resin (A), various known terminators can be used. Specifically, as a monohydric phenol,
Examples include phenol, p-cresol, pt-butylphenol, pt-octylphenol, p-cumylphenol, bromophenol, tribromophenol, nonylphenol and the like.

Further, in order to enhance flame retardancy, a copolymer with a phosphorus-containing compound or a polycarbonate resin end-blocked with a phosphorus-containing compound can be used. Further, in order to enhance the weather resistance, a copolymer with a dihydric phenol having a benzotriazole group, or a polycarbonate resin end-capped with a monohydric phenol having a benzotriazole group can be used.

As the polycarbonate resin (A),
Preferably 2,2-bis (4-hydroxydiphenyl)
Propane, bis (4-hydroxyphenyl) methane, bis (4-hydroxyphenyl) phenylmethane, bis (3,5-dimethyl-4-hydroxyphenyl) methane, 1-phenyl-1,1-bis (4-hydroxyphenyl) ) Ethane, 2,2-bis (3,5-dimethyl-4-)
Hydroxyphenyl) propane, 1,1-bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane, bis (4-hydroxyphenyl) sulfone,
1 selected from 4,4'-dihydroxybenzophenone
More than one phenolic compound, more preferably 2,2
-Bis (4-hydroxydiphenyl) propane, 1,1
A polycarbonate resin or a polycarbonate-polyorganosiloxane copolymer obtained by reacting one or more phenol compounds selected from -bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane with phosgene or a carbonic acid diester; It is preferably used in view of the moldability of the flame-retardant thermoplastic resin composition of the present invention and the mechanical strength of the obtained molded article.

The viscosity average molecular weight of the polycarbonate resin (A) is preferably 10,000 to 60,000,
More preferably, it is 15,000-45,000, and most preferably, 18,000-35,000. If the viscosity average molecular weight is less than 10,000, the flame retardancy and strength of the obtained resin composition will be insufficient, and if the viscosity average molecular weight exceeds 60,000, there will be a problem in molding fluidity.

The polycarbonate resin (A) is used alone or in combination of two or more. 2
When used in combination of more than one kind, the combination is not limited. For example, those having different monomer units, different copolymerization molar ratios, different molecular weights, and the like can be arbitrarily combined.

The low melting point glass referred to in this specification is 700
C. or lower, preferably 600.degree. C. or lower, more preferably 50.degree.
It refers to glass that softens or melts at 0 ° C. or lower, has a softening point in the range of 450 to 700 ° C., and is not particularly limited in composition as long as it has a softening point in that range. If the softening point is lower than 450 ° C., the flame retardancy may decrease due to dripping of the resin fire during combustion. Also, when the softening point is higher than 700 ° C., the flame retardancy is not sufficient.

The type of the low-melting glass is not particularly limited, but may be lead silicate, borate, phosphate, germanate, thallate, molybdate, tellurate, vanadate, fluoride, Those formed from at least one compound selected from the group consisting of phosphoric acid, chalcogenides and oxychalcogenides are preferred. In consideration of water resistance, stability and availability of raw materials,
More preferably, it comprises at least one compound selected from the group consisting of lead silicate, borate, phosphate, germanate, thallate, molybdate, tellurate and vanadate.

Further, the low melting point glass is SiO ₂ ,
B ₂ O ₃ , Al ₂ O ₃ , PbO, Tl ₂ O, Bi ₂ O
_{3, CdO, ZnO, BaO,} Li 2 O, Na 2 O, K
₂ O, V ₂ O ₅ , TiO ₂ , ZrO ₂ , FeO, and C
Those containing at least one type of metal oxide selected from the group consisting of uO are preferred. Particularly preferably, SiO ₂ , B ₂ O ₃ , Al ₂ O ₃ , PbO, K ₂
At least one selected from the group consisting of O, Na ₂ O and BaO is a constituent element.

The ratio of the above constituent elements is appropriately determined so as to satisfy the condition of the softening point.

The desired object can be achieved by adding 0.1 to 50 parts by weight of the low melting glass of the present invention to 100 parts by weight of the resin. If the amount is less than 0.1 part by weight, the effect of improving the flame retardancy may not be obtained, and if the amount exceeds 50 parts by weight, the surface properties, moldability and the like tend to deteriorate. Preferably it is 0.3 to 30 parts by weight, more preferably 0.5 to 20 parts by weight, particularly preferably 1 to 1 part by weight.
0 parts by weight.

The fluororesin (C) used in the present invention is a resin having a fluorine atom. Specifically, polymonofluoroethylene, polydifluoroethylene, polytrifluoroethylene, polytetrafluoroethylene,
Examples thereof include a fluorinated polyolefin resin such as a tetrafluoroethylene / hexafluoropropylene copolymer and a polyvinylidene fluoride resin. Further, a copolymer obtained by polymerizing a monomer used for producing the fluororesin and a copolymerizable monomer in combination may be used.

The fluorinated resin (C) is preferably a fluorinated polyolefin resin, and more preferably a fluorinated polyolefin resin having an average particle diameter of 700 μm or less. Here, the average particle size refers to an average particle size of secondary particles formed by aggregation of primary particles of a fluorinated polyolefin resin.

Further, the fluorinated polyolefin resin preferably has a ratio of density to bulk density (density / bulk density) of 6.0.
The following fluorinated polyolefin resin: Here, the density and the bulk density are measured by the method described in JIS-K6891.

The fluororesin (C) may be used alone or in combination of two or more. When two or more kinds are used in combination, the combination is not limited. For example, different types are used arbitrarily.

The amount of the fluororesin (C) used is 0.005 per 100 parts by weight of the polycarbonate resin (A).
To 1 part by weight, preferably 0.01 to 0.75 part by weight, more preferably 0.02 to 0.6 part by weight.
If the amount is less than 0.005, the effect of improving the flame retardancy is small, and if it exceeds 1 part by weight, the molding fluidity and the surface appearance of the molded article of the flame retardant resin composition of the present invention tend to decrease. .

The flame-retardant resin composition of the present invention contains a silicone compound within the range not impairing the characteristics (flame-retardant properties, etc.) of the present invention in order to further enhance the molding fluidity and the flame retardancy. Etc. can be added.

The silicone compound refers to a polyorganosiloxane in a broad sense, and specifically includes (poly) diorganosiloxane compounds such as dimethylsiloxane and phenylmethylsiloxane; methylsilsesquioxane, phenylsilsesquioxane (Poly) organosyl sesquioxane compounds such as trimethylsilhemioxane, triphenylsilhemioxane, etc .; (poly) triorganosylhemioxane compounds; copolymers obtained by polymerizing these; polydimethyl Siloxane, polyphenylmethylsiloxane and the like can be mentioned. In the case of a polyorganosiloxane, a modified silicone having a molecular terminal substituted by an epoxy group, a hydroxyl group, a carboxyl group, a mercapto group, an amino group, an ether group or the like is also useful. The shape of the silicone is not particularly limited, and any shape such as an oil, a gum, a varnish, a powder, and a pellet can be used.

The flame-retardant resin composition of the present invention can be further improved in mechanical strength and heat resistance by adding a reinforcing filler within a range not impairing the flame retardancy of the present invention. Specific examples of the reinforcing filler include, for example, glass fibers, carbon fibers, fibrous fillers such as potassium titanate fibers, glass beads, glass flakes, talc, mica, kaolin, wollastonite, smectite, diatomaceous earth, carbonic acid Calcium, calcium sulfate, barium sulfate and the like can be mentioned.

The reinforcing filler is preferably a silicate compound from the viewpoint of flame retardancy.

As the silicate compound, the chemical composition is S
Compounds having a shape such as powder, granules, needles, and plates containing iO ₂ units, for example, magnesium silicate, aluminum silicate, calcium silicate, talc, mica, wollastonite, kaolin, diatomaceous earth, smectite And the like, and may be natural or synthetic. Among them, talc, mica, kaolin and smectite are preferred, and talc and mica are particularly preferred.

Further, the silicate compound may be treated with a surface treating agent such as a silane coupling agent or a titanate coupling agent. Examples of the silane coupling agent include epoxy silane, amino silane, and vinyl silane. Examples of the titanate coupling agent include monoalkoxy type, chelate type, and coordinate type.

The method of treating the silicate compound with the surface treating agent is not particularly limited, and can be carried out by a usual method. For example, the surface treatment agent can be added to the layered silicate and stirred or mixed in a solution or while heating.

Any other thermoplastic or thermosetting resin, such as polyester resin, polyamide resin, polystyrene resin, polyphenylene sulfide resin, as long as the properties of the flame retardant resin composition of the present invention are not impaired. , Polyphenylene ether resin, polyacetal resin, polysulfone resin, polyolefin resin,
A rubber-like elastic body or the like may be added alone or in combination of two or more.

In order to make the flame-retardant resin composition of the present invention higher in performance, an antioxidant such as a phenolic antioxidant and a thioether antioxidant, and a heat stabilizer such as a phosphorus-based stabilizer are used. It is preferable to use agents alone or in combination of two or more. Further, if necessary, usually well-known stabilizers, lubricants, release agents, plasticizers, ultraviolet absorbers, light stabilizers, pigments, dyes, antistatic agents, conductivity-imparting agents, dispersants, compatibilization Additives such as agents and antibacterial agents can be used alone or in combination of two or more.

The method of molding the flame-retardant resin composition produced by the present invention is not particularly limited, and molding methods generally used for thermoplastic resins, such as injection molding, blow molding, extrusion molding, and the like. Vacuum molding, press molding, calendar molding, etc. can be applied.

[0042]

EXAMPLES Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited thereto. In the following, “parts” means parts by weight and “%” means% by weight, unless otherwise specified.

Preparation of Low Melting Glass Inorganic compounds used in Examples and Comparative Examples are Na ₂ O 25-4
5 wt%, BaO 5 to 15 wt%, SiO ₂ 10~3
2 wt%, PbO 50 to 80 wt%, B ₂ O ₃ 7~40
Wt%, Al ₂ O ₃ 2~6 wt%, CuO 10 to 30%
The glass was fired by blending within the range described above, and the properties during heating were controlled. Table 1 shows the composition and softening point of each low-melting glass. The obtained glass composition was pulverized with a ball mill and used as a particle size of 100 mesh or less.

Measurement of Softening Point of Low Melting Point Glass The softening point of low melting point glass is 23.5 cm long glass having a uniform diameter of 0.55 to 0.75 mm according to JIS-R3104 (softening point test method of glass). When the temperature of the fiber was raised at a rate of about 5 ° C. per minute over the upper 10 cm of the fiber, it was determined as the temperature at which the fiber grew at its own weight at a rate of 1 mm for 1 minute.

Preparation of Resin Composition Example 1 100 parts by weight of a bisphenol A type polycarbonate resin (PC-1) having a viscosity average molecular weight of about 22,000, 3 parts by weight of a low melting point glass (G-1) having a softening point of 602 ° C. 0.1 parts by weight of each of ADK STAB HP-10 and AO-60 (both are trade names, manufactured by Asahi Denka) as phosphorus-based and phenol-based stabilizers, and Polyflon FA-500 (trade name, manufactured by Daikin Industries) as tetrafluoroethylene 0.2
Parts by weight in advance, and a vented twin-screw extruder [TEX4
4 (trade name: manufactured by Japan Steel Works, Ltd.) and melt-extruded to obtain a resin composition. After creating the resulting pellets of the test piece was dried for 5 hours at 120 ° C.,
Using a 35t injection molding machine, a 1.6 mm thick bar (width of 12.7 m) at a cylinder temperature of 270 ° C. and a mold temperature of 50 ° C.
m, 127 mm in length) were prepared and evaluated as follows.
Table 1 shows the results. According to the UL-94 flame retardancy evaluation method , the flame retardancy of a 1.6 mm thick bar was evaluated by a V test. Table 1 shows the evaluation results. Examples 2 to 7 and Comparative Examples 1 to 4 As shown in Table 1, low melting glass (G-
1 to G-7), and the resin has a viscosity average molecular weight of about 220.
00 bisphenol A type polycarbonate resin (PC
-1) or a resin composition was obtained in the same manner as in Example 1 using a bisphenol A type polycarbonate resin (PC-2) having a viscosity average molecular weight of about 30,000. Each test piece was prepared from the pellet thus obtained in the same manner as in Example 1, and the above evaluation method was performed. Table 1 shows the evaluation results.

[0046]

[Table 1] As shown in Table 1, in Examples, all the polycarbonate-based resin compositions exhibited very good flame retardancy, and achieved V-0 in the UL-94 standard. On the other hand, Comparative Example 1
No low-melting glass was blended, resulting in inferior flame retardancy. In Comparative Examples 2 and 3, 4 which is out of the range of the present invention
Since a low-melting glass having a softening point of less than 50 ° C. was blended, the resin was dripping during combustion. Further, in Comparative Example 4, low-melting glass having a softening point of 710 ° C., which is out of the range of the present invention, was blended, so that the flame retardancy was reduced.

[0047]

Industrial Applicability The flame-retardant resin composition of the present invention exhibits excellent flame retardancy without using an organic compound containing chlorine, bromine, phosphorus, nitrogen and the like, and is a safe and inexpensive raw material. It can be synthesized relatively easily by using. Such a flame-retardant resin composition is industrially very useful.

Claims (2)

[Claims] 1. A flame-retardant resin composition comprising (A) 100 parts by weight of a polycarbonate resin and (B) 0.1 to 50 parts by weight of a low-melting glass having a softening point in a range of 450 to 700 ° C. Further, (C) 0.005 fluororesin
The flame-retardant resin composition according to claim 1, comprising from 1 to 1 part by weight.