JP6131112B2 - Styrene flame-retardant resin composition and molded body using the same - Google Patents

Description

The present invention relates to a styrene-based flame retardant resin composition having high flame resistance (UL94 5V) and light resistance, and having an excellent balance between strength and heat resistance.

Rubber-modified styrenic resins are excellent in moldability and dimensional stability, and are relatively inexpensive, and are used in a wide range of applications. In particular, flame retardant resins are used in various fields including office automation equipment such as word processors, personal computers, copying machines, printers, and home appliances such as TVs, VTRs, and audios.

An exterior cover used for a copying machine and a printer plays a role as a fireproof enclosure to prevent combustion, scattering of high-temperature substances, blowing of flames, and the like. Small materials can be used as long as they have UL94 V-1 flame retardant materials, but large flame retardants and devices that are used in a fixed manner require high flame resistance (UL94 5V). Is done.

Moreover, since the exterior member is irradiated with direct / indirect sunlight or artificial lighting such as a fluorescent lamp, light resistance is required. In particular, copying machines and printers that are used in a large or fixed manner tend to have a lower update frequency and a longer service life than small machines, and require higher light resistance than small machines.

In a large-sized or fixed device, heat radiation increases as the internal mechanism becomes larger / complex, so that higher heat resistance is required compared to a small machine. Furthermore, in recent years, copying machines and printers are also being made thinner and lighter, and a further balance between strength and heat resistance is required.

Conventionally, various flame retardants have been proposed in order to impart flame retardancy to styrene-based resins. Among them, halogen-containing organic compounds that are inexpensive and excellent in physical property balance are often used as flame retardants. Typical examples include tetrabromobisphenol A, decabromodiphenyl ether, decabromodiphenylethane, brominated triazine, brominated epoxy, brominated phthalimide, or a brominated epoxy resin with the epoxy group blocked with tribromophenol. used.

Conventionally, as a method for obtaining the above-mentioned flame retardant resin, a resin composition using a polyhalogenated diphenylalkane and ethylenebistetrabromophthalimide (Japanese Patent Laid-Open No. 10-204236), and a polyhalogenated diphenylalkane as essential components are used. In addition, resin compositions (JP-A-11-217482, JP-A-08-283525) and the like that use an ether derivative of a halogen-containing aromatic diol and a halogenated bisimide as optional components have been proposed. However, both of them have a flame retardancy level of UL94 V-0, and do not satisfy the flame retardancy (UL94 5V) required for a large-sized or fixedly used copying machine and printer exterior cover.

For these reasons, there is a need for a styrene-based flame retardant resin composition having high flame retardancy (UL94 5V) and light resistance, and having an excellent balance between strength and heat resistance.

JP-A-10-204236 JP-A-11-217482 Japanese Patent Laid-Open No. 08-283525

The present invention relates to a styrene-based flame retardant resin composition having high flame resistance (UL94 5V) and light resistance, and having an excellent balance between strength and heat resistance.

As a result of intensive studies on the above problems, the present inventor has completed the present invention by using a specific flame retardant together to obtain a resin composition containing a flame retardant aid, talc, an ultraviolet absorber, and a stabilizer.
1. (A) 100 parts by mass of the rubber-modified styrene resin, the total amount of (B) brominated phthalimide compound and (C) brominated diphenylalkane compound is 10 to 20 parts by mass, and (B) brominated phthalimide The ratio of the compound to (C) brominated diphenylalkane compound is 30/70 to 90/10, (D) 1 to 10 parts by mass of flame retardant aid, (E) 1 to 10 parts by mass of talc, (F) UV absorption A styrene-based flame retardant resin composition comprising an agent and (G) a light stabilizer.
2. When (A) the rubber-modified styrenic resin is 100 parts by mass, the total amount of (F) UV absorber and (G) light stabilizer is 0.01 to 2 parts by mass, and (F) UV absorber. And (G) the styrene-based flame retardant resin composition as described in 1 above, wherein the ratio of the light stabilizer is 10/90 to 90/10.
3. The styrene flame-retardant resin composition according to any one of 1 and 2 above, wherein the flammability in UL94 is 5V.
4. The molded body according to any one of 1 to 3, which is obtained by molding a styrene-based flame retardant resin composition.

The styrene-based flame retardant resin composition according to the present invention is a styrene-based flame retardant resin composition having high flame resistance (UL94 5V) and light resistance, and having an excellent balance between strength and heat resistance. is there. The characteristics of the styrene-based flame retardant resin composition are particularly suitable for exterior covers used for copying machines and printers that are used in large or fixed sizes, and have an extremely large industrial utility value.

The rubber-modified styrene resin (A) used in the present invention is a product obtained by dissolving a rubber component in a styrene monomer and polymerizing it with stirring using a polymerization initiator such as thermal polymerization or peroxide, The production process may be batch polymerization or continuous polymerization. Examples of the styrenic monomer include o-methyl styrene, m-methyl styrene, p-methyl styrene, 2,4-dimethyl styrene and the like, and styrene is most preferable. These monomers may be used as a homopolymer, or two or more types may be used in combination. Moreover, it is good also as a copolymer using methacrylic acid, methyl methacrylate, etc. which can be copolymerized with these monomers. As the rubber component, homopolymers such as butadiene and isoprene, and copolymers with styrene and methyl methacrylate that can be copolymerized with butadiene are used, and the molecular structure of the copolymer may be a random structure or a block structure. , May have a branched structure. Further, such a rubber-modified styrene resin may be used in combination with polystyrene (GPPS) containing no rubber component for the purpose of adjusting the amount of rubber component, impact strength, and fluidity of the resin composition. The rubbery polymer in the flame retardant resin composition is 3 to 12% by mass, preferably 4 to 11% by mass. When the amount of the rubbery polymer is less than 3% by mass, the strength is lowered, and when it is more than 12% by mass, the flexural modulus is lowered, which is not preferable. The (A) rubber-modified styrenic resin preferably uses a high-cis polybutadiene rubber containing 70% by mass or more of a rubber component in a ratio of cis-1,4 bonds of 90 mol% or more. When a low-cis polybutadiene rubber having a 1,4-cis bond content of 10 to 40 mol% is used, it is not preferable because the releasability is lowered.

The (B) brominated phthalimide compound used in the present invention is a compound represented by the following (Chemical Formula 1).

（ここで、ＲはＣｎＨ２ｎ（ｎは０〜６の整数）の構造のアルキレン基、Ｘ１およびＸ２はそれぞれ独立に整数１〜４の臭素原子でありＸ１＋Ｘ２≧２を表す。）

(Wherein R is an alkylene group having a structure of CnH2n (n is an integer of 0 to 6), X1 and X2 are each independently a bromine atom of an integer of 1 to 4, and X1 + X2 ≧ 2).

(B) As brominated phthalimide compounds, dibromo substitution products such as methylene-bis-phthalimide, ethylene-bis-phthalimide, propylene-bis-phthalimide, butylene-bis-phthalimide, pentylene-bis-phthalimide, hexylene-bis-phthalimide, Examples include tribromo-substituted, tetrabromo-substituted, pentabromo-substituted, hexabromo-substituted, heptabromo-substituted, and octabromo-substituted. Preferred are octabromo-substituted products of ethylene-bis-phthalimide, propylene-bis-phthalimide, butylene-bis-phthalimide, pentylene-bis-phthalimide, and hexylene-bis-phthalimide.

The (C) brominated diphenylalkane compound used in the present invention is a compound represented by the following (Chemical Formula 2).

（ここで、ＲはＣｎＨ２ｎ（ｎは１〜１０の整数）の構造のアルキレン基、Ｘ１およびＸ２はそれぞれ独立に整数１〜５の臭素原子でありＸ１＋Ｘ２≧２を表す。）

Here, R is an alkylene group having a structure of CnH2n (n is an integer of 1 to 10), X1 and X2 are each independently a bromine atom of an integer of 1 to 5, and X1 + X2 ≧ 2.

(C) As brominated diphenylalkane compounds, dibromomethane, 1,2-diphenylethane, 1,3-diphenylpropane, 1,6-diphenylhexane and other dibromo-substituted, tribromo-substituted, tetrabromo-substituted, pentabromo-substituted, Examples include hexabromo-substituted, heptabromo-substituted, octabromo-substituted, nonabromo-substituted, and decabromo-substituted. Preferred are octabromo-substituted, nonabromo-substituted and decabromo-substituted diphenylalkanes, and particularly preferred is decabromodiphenylethane.

It is essential to use (B) brominated phthalimide compound and (C) brominated diphenylalkane compound in a total amount of 10 to 20 parts by mass, preferably 12 to 18 parts by mass. The ratio of (B) brominated phthalimide compound to (C) brominated diphenylalkane compound is in the range of 30/70 to 90/10, preferably 50/50 to 90/10, more preferably 60/40 to 90/10. It is. When the total amount of (B) brominated phthalimide compound and (C) brominated diphenylalkane compound is less than 10 parts by mass, flame retardancy cannot be ensured, and when it exceeds 20 parts by mass, Charpy impact strength decreases. When the ratio of (B) brominated phthalimide compound and (C) brominated diphenylalkane compound is smaller than 30/70, the light resistance is deteriorated, and when it is larger than 90/10, the Charpy strength is decreased.

In the present invention, the flame retardant aid (D) is used together with the brominated flame retardants (B) and (C). The flame retardant aid functions to further enhance the flame retardant effect of the flame retardant, such as antimony trioxide, antimony tetroxide, antimony pentoxide, sodium antimonate, boric acid as a boron compound, etc. Zinc, barium metaborate, anhydrous zinc borate, anhydrous boric acid, etc., tin compounds such as stannic oxide, zinc stannate, zinc hydroxystannate, etc., molybdenum compounds such as molybdenum oxide, ammonium molybdate, zirconium compounds, etc. Zirconium oxide, zirconium hydroxide, etc., and zinc-based compounds include zinc sulfide. Antimony trioxide is preferred.

(D) It is essential to use 1 to 10 parts by mass of the flame retardant aid, and preferably 2 to 8 parts by mass. When the amount of the flame retardant aid is less than 1 part by mass, flame retardancy cannot be ensured, and when it is more than 10 parts by mass, the Charpy impact strength is lowered.

As the inorganic compound, (E) talc is used. (E) The amount of talc added is 1 to 10 parts by mass, preferably 1 to 8 parts by mass. If the talc content is less than 1 part by mass, flame retardancy cannot be ensured, and if the talc content is greater than 10 parts by mass, the Charpy impact strength decreases.

Examples of (F) UV absorbers include benzotriazole UV absorbers, benzophenone UV absorbers, salicylate UV absorbers, cyanoacrylate UV absorbers, and nickel complex UV absorbers. Preferred is a benzotriazole ultraviolet absorber.

A commercially available product can be applied as the benzotriazole ultraviolet absorber. For example, 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2- (3-tert-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole, 2- (2′- Hydroxy-3 ', 5'-di-t-butylphenyl) benzotriazole, 2- (2'-hydroxy-5'-t-octylphenyl) benzotriazole, 2- (2'-hydroxy-3'-t- Butyl-5′-methylphenyl) -5-chlorobenzotriazole, 2- (2′-hydroxy-3 ′, 5′-di-t-butylphenyl) -5-chlorobenzotriazole, 2- (2′-hydroxy) -3 ′, 5′-di-t-aminophenyl) benzotriazole, 2- {2′-hydroxy-3 ′-(3 ″, 4 ″, 5 ″, 6 ″ -tetrahydrophthal Imidomethyl) -5′-methylphenyl} benzotriazole, 2,2′-methylenebis {4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazol-2-yl) phenol}, Examples include 6- (2-benzotriazolyl) -4-t-octyl-6′-t-butyl-4′-methyl-2,2′-methylenebisphenol. These may be used alone or in combination of two or more. 2- (2'-hydroxy-3'-t-butyl-5'-methylphenyl) -5-chlorobenzotriazole is particularly preferable.

(G) A hindered amine light stabilizer is preferable as the light stabilizer, and commercially available ones can be applied. For example, bis (2,2,6,6-tetramethyl-4-pepyridyl) sebacate, bis (1-octyloxy-2,2,6,6-tetramethyl-4-pepyridyl) sebacate, dimethyl succinate and 1- Polycondensate with (2-hydroxyethyl) -4-hydroxy-2,2,6,6-tetramethylpepyridine, poly [{6- (1,1,3,3-tetramethylbutyl) amino-1 , 3,5-triazine-2,4-diyl} {(2,2,6,6-tetramethyl-4-pepyridyl) imino} hexamethylene {(2,2,6,6-tetramethyl-4-pepyridyl) ) Imino}], N, N′-bis (3-aminopropyl) ethylenediamine and 2,4-bis [N-butyl-N- (1,2,2,6,6-pentamethyl-4-pepyridyl) amino] -6-chloro-1,3 Condensate with 5-triazine, 1,2,3,4-tetra (2,2,6,6-tetramethyl-4-pepyridyl) -butanetetracarboxylate, 1,4-bis (2,2,6 , 6-tetramethyl-4-pepyridyl) -2,3-butanedione, tris- (2,2,6,6-tetramethyl-4-pepyridyl) trimellitate, 1,2,2,6,6-pentamethyl-4 -Pepyridyl-n-octoate, 1,2,2,6,6-pentamethyl-4-pepyridyl stearate, 4-hydroxy-1,2,2,6,6-pentamethylpepyridine, bis (1,2 , 2,6,6-pentamethyl-4-pepyridinyl) sebacate, bis (1,2,2,6,6) 2- (3,5-t-butyl-4-hydroxybenzyl) -2-n-butylmalonate -Pentamethyl-4-pe Lysyl), and the like. These may be used alone or in combination of two or more. Bis (2,2,6,6-tetramethyl-4-piperidyl) separate is particularly preferable.

(F) A ultraviolet absorber and (G) light stabilizer are 0.01-2 mass parts as the total amount, Preferably it is 0.1-1.5 mass parts. The ratio of the ultraviolet absorber and the light stabilizer is in the range of 10/90 to 90/10, preferably in the range of 20/80 to 80/20. When the amount of the ultraviolet absorber and the light stabilizer is less than 0.01 parts by mass, the light resistance is deteriorated, and when the amount is more than 2 parts by mass, the heat resistance is decreased.

The styrene-based flame retardant resin composition of the present invention has various additives within a range not exceeding the gist of the present invention, such as dyes and pigments, coloring agents, lubricants, antioxidants, anti-aging agents, antistatic agents, and filling. Known additives such as additives, compatibilizers, anti-dripping agents, colorants such as titanium oxide and carbon black, and modifiers such as elastomer components (SBS and hydrogenated SBS) can be added. These addition methods are not particularly limited, and known methods such as (A) the rubber-modified styrenic resin to be used before the start of polymerization, with respect to the reaction solution in the middle of polymerization, or after the completion of polymerization, and (B When blending a) brominated phthalimide compound, (C) brominated diphenylalkane compound, (D) flame retardant aid, (E) talc, (F) ultraviolet absorber, (G) light stabilizer, It can also be added in an extruder or a molding machine.

The method for obtaining the styrene-based flame retardant resin composition according to the present invention is not particularly limited, and a known mixing technique can be applied. For example, a mixture previously mixed with a mixing apparatus such as a mixer-type mixer, V-type blender, and tumbler-type mixer is used as a Banbury mixer, kneader, roll, single-screw extruder, special single-screw extruder, And melt-kneading with a twin screw extruder or the like. Methods for adding each raw material include (A) rubber-modified styrene resin and (B) brominated phthalimide compound, (C) brominated diphenylalkane compound, (D) flame retardant aid, (E) talc, (F ) Ultraviolet absorber, (G) Light stabilizer, and other additives as required, are directly charged into the kneader as described above, and the additives are added separately from the middle of the melt kneader such as an extruder. It may be added to obtain a resin composition, or within a range not exceeding the gist of the present invention, resin and the like in advance (B) brominated phthalimide compound, (C) brominated diphenylalkane compound, (D) flame retardant aid The master batch which knead | mixed the agent etc. into the pellet form is produced, and the method of throwing this master batch and (A) rubber-modified styrene resin into a kneading machine may be used.

There is no particular limitation on the molding method for obtaining a molded product from the styrene-based flame retardant resin composition of the present invention, but injection molding is preferable, and injection molding is particularly suitable for an outer cover of a copying machine and a printer. .

Hereinafter, details will be described by way of examples, but the present invention is not limited thereto.

(A) Rubber-modified styrene resin: The rubber-modified styrene resin (A) used in Examples and Comparative Examples has the following composition. This is a rubber-modified styrene resin using a high-cis polybutadiene rubber containing cis 1,4 bonds in a ratio of 90 mol% or more in the rubber-like polymer. The composition of this rubber-modified styrene resin has a reduced viscosity of 0.76 dl / g in the matrix portion, a rubber-like polymer content of 9.1% by mass, and a rubber-like polymer gel content of 26%. The volume average particle diameter of the rubber-like polymer is 2.8 μm. The reduced viscosity, the mass% of the rubber-like polymer, the mass% of the gel content of the rubber-like polymer, and the volume average particle diameter of the rubber-like polymer as measured herein were measured by the following methods.

Measurement of reduced viscosity (ηsp / C): 1 g of rubber-modified styrene resin is mixed with 17.5 ml of methyl ethyl ketone and 17.5 ml of acetone, dissolved by shaking at a temperature of 25 ° C. for 2 hours, and then insoluble by centrifugation. The mixture is allowed to settle, the supernatant is removed by decantation, 250 ml of methanol is added to precipitate the resin component, and the insoluble component is filtered and dried. The resin component obtained by the same operation was dissolved in toluene to prepare a sample solution having a polymer concentration of 0.4% (mass / volume). The sample solution and pure toluene were measured at a constant temperature of 30 ° C. using a Ubbelohde viscometer, and the number of seconds during which the solution flowed was measured.
ηsp / C = (t1 / t0-1) / C
t0: Pure toluene flow down seconds
t1: Sample solution flow down seconds
C: Polymer concentration

Measurement of rubbery polymer content: The styrenic flame retardant resin composition was dissolved in chloroform, a certain amount of iodine monochloride / glacial acetic acid solution was added and left in the dark for about 30 minutes, and then 15% by mass of iodine. Potassium iodide solution and 50 ml of pure water were added, and excess iodine monochloride was titrated with 0.1N sodium thiosulfate solution, and calculated from the amount of iodine monochloride added.

Measurement of gel content: rubber-modified styrene resin was added to toluene at a ratio of 3.3% (mass / volume), dissolved by shaking at a temperature of 25 ° C. for 40 minutes, and then centrifuged (revolution speed: 10,000 to 14000 rpm, separation) The insoluble content (gel content) was allowed to settle at 30 minutes, and the supernatant was removed by decantation to obtain a gel. Next, this swollen gel was preliminarily dried at a temperature of 100 ° C. for 2 hours, and then dried by a vacuum dryer at a temperature of 120 ° C. for 1 hour. It cooled to normal temperature with the desiccator, weighed precisely, and computed with the following formula.
Gel fraction (%) = [(m1-m0) / S] × 100
m0: centrifugal sedimentation tube mass
m1: Dry gel + centrifugal sedimentation tube mass
S: Sample resin mass

Measurement of volume average particle diameter of rubber-like polymer: A rubber-modified styrene resin was completely dissolved in dimethylformamide and measured with a laser diffraction particle size distribution apparatus.

(B) Brominated phthalimide compound: Trade name SAYTEX BT-93 (manufactured by Albemarle Japan) was used.

(C) Brominated diphenylalkane compound: Trade name SAYTEX 8010 (manufactured by Albemarle Japan) was used.

As a comparative example of the flame retardant, tribromophenoxytriazine: trade name SR245 (Daiichi Kogyo Seiyaku Co., Ltd.) was used.

(D) Flame retardant aid: Antimony trioxide trade name AT-3CN (manufactured by Suzuhiro Chemical Co., Ltd.) was used.

(E) Talc: The brand name KP talc (manufactured by Fuji Talc) was used.

(F) Ultraviolet absorber: 2- (2'-hydroxy-3'-t-butyl-5'-methylphenyl) -5-chlorobenzotriazole trade name JF-79 (manufactured by Johoku Chemical Co., Ltd.) was used.

(G) Light stabilizer: Bis (2,2,6,6-tetramethyl-4-piperidyl) sepacate product name JF-90 (manufactured by Johoku Chemical Co., Ltd.) was used.

[Preparation of resin composition]

(A) rubber-modified styrenic resin, (B) brominated phthalimide compound, (C) brominated diphenylalkane compound, (D) flame retardant aid, (E) talc ( F) Ultraviolet absorber and (G) light stabilizer were weighed and mixed with a Henschel mixer (Mitsui Miike Chemical Co., Ltd., FM20B), and the resulting mixture was twin screw extruder with a screw feeder (Nippon Steel Works ( The resin composition pellets were kneaded with TEM26SS).

  In addition, calcium stearate, mineral oil, polytetrafluoroethylene, phenolic antioxidant {octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate}, polyethylene wax, styrene during premixing -Butadiene-styrene block copolymer and titanium oxide were also added simultaneously.

Extrusion conditions Cylinder set temperature: 200 ° C. (conveying part) to 240 ° C. (kneading part)
Screw rotation speed: 300rpm
Extrusion speed: 30kg / h

[Molding specimens for measuring mechanical properties]
The obtained pellets were dried by heating at a temperature of 70 ° C. for 3 hours, and then an A-type test piece (dumbbell) described in JIS K 7139 was molded by an injection molding machine (manufactured by Nippon Steel Works, Ltd., J100E-P). did. At this time, the cylinder temperature was 205 ° C. and the mold temperature was 45 ° C.

[Charpy impact strength]
Measurement was performed based on JIS K 7111-1, using a test piece cut out from the center of the dumbbell piece and cut into a notch (type A, r = 0.25 mm). When the strength is less than 8 kJ / m 2, the strength of the molded product is insufficient, and 8 KJ / m 2 or more is regarded as acceptable.

[Light resistance]
The test piece for evaluation of light resistance was formed as an 80 × 50 × 2 mm test piece using an injection molding machine (manufactured by Nippon Steel Works, Ltd., J100E-P). At this time, the cylinder temperature was 190 ° C. and the mold temperature was 30 ° C. Using Atlas Xenon Weather Meter Ci4000, based on ASTM D 4459, the test piece hue difference ΔE * ab after irradiation for 300 hours at an irradiation intensity of 0.3 W / m 2, a black panel temperature of 55 ° C. and a humidity of 50% RH in Japan It was measured with Σ80 manufactured by Denshoku Industries Co., Ltd. and expressed as the difference from the unexposed sample. If ΔE * ab is greater than 3, the hue change during long-term use becomes significant. Therefore, ΔE * ab is 3 or less.

[Combustion quality]
The test piece for evaluation of combustibility was formed as a 127 × 12.7 × 2.0 mm combustion test piece using an injection molding machine (manufactured by Nippon Steel Works, J100E-P). A combustion test was performed based on the vertical combustion test method (UL94) of Subject 94 of US Underwriters Laboratories. The case where it was evaluated as 5V by this test method was accepted, and the case where it was less than 5V was rejected.

(A) rubber-modified styrene resin, (B) brominated phthalimide compound, (C) brominated diphenylalkane compound, (D) flame retardant aid, (E) talc (F) ultraviolet absorber, (G) light The evaluation results are shown in Tables 1 to 4 together with the blending amounts of the stabilizers.

(About each example and comparative example)
Examples 1 to 6 are styrene-based flame retardant resin compositions of the present invention, satisfying UL94 5V by satisfying the composition and specified amount of the present invention, Charpy impact strength, deflection temperature under load, and light resistance It can be seen that has a high balance.

However, it can be seen that the styrene-based flame retardant resin compositions obtained in Comparative Examples 1 to 9 that do not satisfy the provisions of the present invention are excellent in any one, but not all.

For example, if the ratio of (B) brominated phthalimide compound and (C) brominated diphenylalkane compound deviates from the specified amount, as shown in Comparative Example 1, combustibility and light resistance are insufficient. (B) When a flame retardant is added until the brominated phthalimide compound alone satisfies 5 V flammability, the Charpy impact strength is insufficient as shown in Comparative Example 2. (C) When a flame retardant is added until the brominated diphenylalkane compound alone satisfies 5 V flammability, light resistance and Charpy impact strength are insufficient as shown in Comparative Example 10. (C) If another flame retardant compound is used instead of the brominated diphenylalkane compound, the flame retardancy and Charpy impact strength are insufficient as shown in Comparative Example 3. When the amount of (B) brominated phthalimide compound and (C) brominated diphenylalkane compound, (D) flame retardant assistant, or (E) talc is small, the flame retardancy is as shown in Comparative Examples 4, 6, and 8. Is lacking. When the amount of (B) brominated phthalimide compound and (C) brominated diphenylalkane compound is large, the Charpy impact strength is insufficient as shown in Comparative Example 5. If the amount of (D) flame retardant aid or (E) talc is large, the Charpy impact strength is insufficient as shown in Comparative Examples 7 and 9, and the flame retardancy is NG due to the occurrence of glowing.

Claims (4)

  (A) 100 parts by mass of the rubber-modified styrene resin, the total amount of (B) brominated phthalimide compound and (C) brominated diphenylalkane compound is 10 to 20 parts by mass, and (B) brominated phthalimide The ratio of the compound to (C) brominated diphenylalkane compound is 30/70 to 90/10, (D) 1 to 10 parts by mass of flame retardant aid, (E) 1 to 10 parts by mass of talc, (F) UV absorption A styrene-based flame retardant resin composition comprising an agent and (G) a light stabilizer.   When (A) the rubber-modified styrenic resin is 100 parts by mass, the total amount of (F) UV absorber and (G) light stabilizer is 0.01 to 2 parts by mass, and (F) UV absorber. The styrene flame-retardant resin composition according to claim 1, wherein the ratio of (G) and the light stabilizer is 10/90 to 90/10. Flammability in UL94 has 5V, The styrene-type flame retardant resin composition of any one of Claim 1 and 2 characterized by the above-mentioned.   The molded article according to any one of claims 1 to 3, wherein the molded article is obtained by molding a styrene-based flame retardant resin composition.