KR101616468B1 - Flame retardant thermoplastic resin composition having good clarity and surface hardness and molded article prepared therefrom - Google Patents

Abstract

The present invention relates to a flame retardant polycarbonate resin composition excellent in transparency and surface hardness and a molded article produced therefrom, and more particularly, to a flame retardant polycarbonate resin composition which is excellent in transparency and surface hardness, and more particularly, a polycarbonate resin, a methacrylate copolymer, a phosphazene compound and octabromo- , 3,3-trimethyl indane compound, and is excellent in flame retardance, transparency and surface hardness, and a molded article produced from the polycarbonate resin composition.

Description

TECHNICAL FIELD [0001] The present invention relates to a flame retardant thermoplastic resin composition having excellent transparency and surface hardness, and a molded article produced therefrom. [0002] Flame retardant thermoplastic resin composition having good clarity and surface hardness and molded article prepared therefrom,

The present invention relates to a flame retardant polycarbonate resin composition excellent in transparency and surface hardness and a molded article produced therefrom, and more particularly, to a flame retardant polycarbonate resin composition which is excellent in transparency and surface hardness, and more particularly, a polycarbonate resin, a methacrylate copolymer, a phosphazene compound and octabromo- , 3,3-trimethyl indane compound, and is excellent in flame retardance, transparency and surface hardness, and a molded article produced from the polycarbonate resin composition.

Background Art [0002] Polycarbonate resins are widely used as electrical parts, machine parts, and industrial resins because they have excellent heat resistance and strength, particularly impact strength and transparency. Particularly, when a polycarbonate resin is used for a TV housing, a computer monitor housing, a copying machine, a printer, a notebook battery, and a lithium battery, which are highly heat-dissipated in the electric and electronic fields, heat resistance and mechanical properties as well as excellent flame retardancy are required . In addition, excellent appearance characteristics are also indispensably required in accordance with recent design trends of electrical and electronic products.

However, since the surface hardness of the polycarbonate is not good as the pencil hardness is 2B, there is a problem that the injection molded article easily scratches due to the external use environment. Conventionally, the method has been dealt with by coating the surface of a molded product. Recently, it is an important technological trend to eliminate the coating process that generates VOC by production cost reduction and environment friendly policy.

On the other hand, the polymethyl methacrylate resin has a pencil hardness of about 3H and is excellent in scratch resistance, but it is very difficult to impart flame retardancy to existing flame retardants and is poor in mechanical properties such as impact strength, There is a difficult problem. Therefore, there have been many attempts to complement the scratch resistance and flame retardancy by using polycarbonate resin and polymethyl methacrylate resin in combination. However, since polycarbonate and polymethylmethacrylate are low in compatibility, phase separation occurs when they are included in the composition, and the refractive index of each resin is also large, so that it is hard to color in solid color because it exhibits a pearl feeling, It is not suitable for use as a case material for electrical and electronic products.

Korean Patent No. 511423 discloses a transparent resin composition in which metal stearic acid is used to reduce the molecular weight of the polycarbonate during the extrusion process to improve the compatibility with the polymethyl methacrylate resin. However, the resin composition has a remarkable mechanical property And it is difficult to uniformly control the extrusion process.

U.S. Patent No. 5,280,070 discloses a transparent resin composition using polycarbonate and syndiotactic polymethylmethacrylate. However, it is difficult to mass-produce syndiotactic polymethylmethacrylate commercially, and the production cost is very high.

U.S. Patent Publication No. 20080015292 discloses a flame retardant resin composition composed of a homopolymer or a copolymer derived from dimethyl bisphenol cyclohexane (DMBPC). However, the composition has a disadvantage that it is very expensive to manufacture and has a significantly low impact strength, making it difficult to use it as a case material for electrical and electronic products.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a polycarbonate resin composition which is excellent in transparency, color stability, flame retardancy, surface hardness and fluidity and a molded article produced therefrom.

According to an aspect of the present invention,

(1) 100 parts by weight of a base resin component comprising (A) 70 to 95% by weight of an aromatic polycarbonate resin and (B) 5 to 30% by weight of a methacrylate copolymer having a weight average molecular weight of 5,000 to 30,000; (2) 5 to 30 parts by weight of phosphazene; And (3) 1 to 15 parts by weight of octabromo-1-phenyl-1,3,3-trimethylindane,

The methacrylate copolymer (B) is obtained by copolymerizing 5 to 50% by weight of copolymerized units of aromatic methacrylate and 50 to 95% by weight of copolymerized units of alkyl methacrylate with respect to 100% by weight of the copolymer (B) And the phosphazene compound (2) is at least one selected from a linear phosphazene compound represented by the following formula (1) and a cyclic phosphazene compound represented by the following formula (2), wherein the octabromo- , And 3-trimethyl indane (3) are represented by the following formula (3): < EMI ID =

[Chemical Formula 1]

(2)

(3)

Wherein R is the same or different from each other and independently represents an alkyl group, an aryl group, an alkyl-substituted aryl group, an aralkyl group, an alkoxy group, an aryloxy group, an amino group or a hydroxy group, k is an integer of 1 to 15 ; In Formula 3, m and n are positive integers, and m + n = 8.

According to another aspect of the present invention, there is provided a molded article produced from the flame retardant thermoplastic resin composition.

The flame retardant thermoplastic resin composition according to the present invention is excellent in transparency, color stability, flame retardancy, surface hardness and fluidity, and has excellent mechanical strength such as impact resistance, heat resistance and excellent processability (in particular, A molded product manufactured therefrom can be used for various office equipment such as a TV, a computer monitor, a copying machine, a printer, a notebook battery, a lithium battery, etc., and an electric / electronic product housing or a case which require transparency, flame retardancy and surface hardness. .

Hereinafter, the present invention will be described in detail.

(1) Base resin component

(A) 70 to 95% by weight of an aromatic polycarbonate resin and (B) a methacrylate copolymer having a weight average molecular weight of 5,000 to 30,000, based on 100% by weight of the total resin composition, 30% by weight.

(A) an aromatic polycarbonate resin

Among the basic resin components, the aromatic polycarbonate resin (A) can be produced from a thermoplastic resin, a divalent phenol, a carbonate precursor and a molecular weight modifier.

The dihydric phenols may be monomers of the aromatic polycarbonate resin (A), and may have, for example, a structure represented by the following formula (4).

[Chemical Formula 4]

In Formula 4, X is a direct bond or a divalent alkyl group substituted or unsubstituted with an aryl group, a sulfide group (-S-), an ether group (-O-), a sulfoxide group ( -S (= O) -), a sulfonyl group (-S (= O) ₂ -), a ketone group (-C (= O) -) and the like. Preferably, X is a linear, branched or cyclic divalent alkyl group substituted or unsubstituted with an aryl group, and more preferably, X is a linear, branched or cyclic C1-C10 divalent alkyl group substituted or unsubstituted with an aryl group. Wherein the aryl group may be a C6-C10 aryl group substituted or unsubstituted with a C1-C10 alkyl group. R ₁ and R ₂ independently represent hydrogen, a halogen atom, or a straight, branched or cyclic alkyl group (for example, C 1 to C 10 alkyl). On the other hand, n and m are independently an integer of 0 to 4.

Non-limiting examples of such dihydric phenols include bis (4-hydroxyphenyl) methane, bis (4-hydroxyphenyl) phenylmethane, bis (4- hydroxyphenyl) naphthylmethane, bis ) - (4-isobutylphenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, 1- Bis (4-hydroxyphenyl) ethane, 1-naphthyl-1,1-bis (4-hydroxyphenyl) Bis (4-hydroxyphenyl) decane, 2-methyl-1,1-bis (4-hydroxyphenyl) propane, 2,2- Typical of these is bisphenol A.

The carbonate precursor is another monomer of the aromatic polycarbonate resin (A), and non-limiting examples thereof include carbonyl chloride (phosgene), carbonyl bromide, bishaloformate, diphenyl carbonate or dimethyl carbonate, Of these, phosgene is preferred.

The molecular weight regulator may be a mono-functional compound similar to the monomers used in the production of the thermoplastic aromatic polycarbonate resin, and may be appropriately selected from known materials. Non-limiting examples thereof include those based on phenols (for example, para-isopropylphenol, para-tert-butylphenol, para-cumylphenol, para-isooctylphenol, para- Etc.), and other aliphatic alcohols and the like may be used. Of these, para-tert-butylphenol (PTBP) is preferred.

The aromatic polycarbonate resin (A) may be, for example, a linear polycarbonate resin, a branched polycarbonate resin, a copolycarbonate resin (e.g., a copolycarbonate resin copolymerized with a silicone resin), or a polyester carbonate resin . According to one embodiment of the present invention, it is preferable that the aromatic polycarbonate resin (A) comprises a branched polycarbonate resin. The branched polycarbonate resin is advantageous for obtaining better flame retardancy by reducing the tendency of the specimen to drip during the flame retardancy test due to excellent melt strength and shape stability of the resin itself. It is preferable that the branched polycarbonate resin is contained in an amount of 10 to 50% by weight in 100% by weight of the whole aromatic polycarbonate resin. If the content of the branched polycarbonate is less than 10% by weight, the anti-dripping effect may be insufficient in the flame retardancy test. If the content of the branched polycarbonate exceeds 50% by weight, a problem may arise in processing the resin due to an increase in melt viscosity.

In addition, preferably, as measured in methylene chloride solution of an aromatic polycarbonate resin (A) having a viscosity average molecular weight (M _v) it is 17,000 ~ 40,000, more preferably 20,000 ~ 30,000. If the viscosity average molecular weight is less than 17,000, mechanical properties such as impact strength and tensile strength may be deteriorated. If the viscosity average molecular weight is more than 40,000, there may be a problem in resin processing due to an increase in melt viscosity.

The aromatic polycarbonate resin (A) is used in an amount of 70 to 95% by weight based on 100% by weight of the total weight of the base resin. When the content of the aromatic polycarbonate resin (A) in the base resin is less than 70% by weight, flame retardancy and mechanical strength are deteriorated. When the content of the aromatic polycarbonate resin (A) is more than 95% by weight,

(B) a methacrylate copolymer

The methacrylate copolymer (B) contained in the basic resin component has a weight average molecular weight of 5,000 to 30,000, and more preferably 8,000 to 20,000 g / mol. If the weight average molecular weight of the copolymer (B) is less than 5,000, mechanical strength and thermal stability are deteriorated. If the copolymer (B) has a weight average molecular weight exceeding 30,000, transparency decreases and haze value increases.

The methacrylate copolymer (B) contains 5 to 50% by weight of copolymerized units of aromatic methacrylate and 50 to 95% by weight of copolymerized units of alkyl methacrylate with respect to 100% by weight of the copolymer (B).

The alkyl methacrylate is preferably a C1 to C6 alkyl methacrylate such as methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, At least one selected from n-propyl methacrylate, iso-propyl methacrylate, n-butyl methacrylate, iso-butyl methacrylate, Can be used. Among them, methyl methacrylate is preferred because it has good compatibility with aromatic polycarbonate and has a role of improving the surface hardness of a molded article.

The copolymer (B) also includes copolymerized units of aromatic methacrylate, wherein the aromatic methacrylate means methacrylate having an aromatic group in the ester moiety. Such aromatic methacrylates are preferably C6-C10 aryl methacrylates or C6-C10 aryl-C1-C6 alkyl methacrylates such as phenyl methacrylate, naphthyl methacrylate ), Benzyl methacrylate, and the like can be used. Of these, phenyl methacrylate is preferable.

The copolymer (B) is obtained by copolymerizing alkyl methacrylate and aromatic methacrylate as described above in an amount of 50 to 95% by weight and 5 to 50% by weight, more preferably 55 to 95% by weight, 90% by weight and 10% by weight to 45% by weight. When the amount of the alkyl methacrylate used is less than 50 wt% of the monomer weight, it is difficult to improve the surface hardness. When the amount of the alkyl methacrylate is more than 95 wt%, it is difficult to maintain transparency. If the amount of the aromatic methacrylate used is less than 5% by weight of the monomer weight, it is difficult to maintain the transparency, and if it exceeds 50% by weight, it is difficult to improve the surface hardness. As the polymerization method of the methacrylate copolymer (B), emulsion polymerization, suspension polymerization, solution polymerization, bulk polymerization and the like can be used, and bulk polymerization or suspension polymerization is preferred, and suspension polymerization is more preferable.

The methacrylate copolymer (B) may further contain, as copolymerized units, additional monomers in addition to the above-mentioned alkyl methacrylate and aromatic methacrylate. For example, a C1 to C6 alkyl acrylate (e.g., methyl acrylate) can be used as an additional monomer as needed, and the amount of the C1 to C6 alkyl acrylate is appropriately selected within a range satisfying the amounts of alkyl methacrylate and aromatic methacrylate .

The methacrylate copolymer (B) is used in an amount of 5 to 30% by weight based on 100% by weight of the total weight of the base resin. When the content of the methacrylate copolymer (B) in the base resin is less than 5% by weight, it is difficult to expect a sufficient improvement in surface hardness. When the content of the methacrylate copolymer (B) exceeds 30% by weight, mechanical properties and flame retardancy may be drastically reduced.

(2) phosphazene

The phosphazene contained in the composition of the present invention is at least one selected from a linear phosphazene compound represented by the following formula (1) and a cyclic phosphazene compound represented by the following formula (2). When mixed, the mixing ratio of the linear phosphazene to the cyclic phosphazene is preferably 0: 100 to 50: 50 by weight.

[Chemical Formula 1]

(2)

Wherein R is the same or different from each other and independently represents an alkyl group, an aryl group, an alkyl-substituted aryl group, an aralkyl group, an alkoxy group, an aryloxy group, an amino group or a hydroxy group, k is an integer of 1 to 15 ; More preferably, R is a C1 to C10 alkyl group, a C6 to C10 aryl group, a C1 to C10 alkyl-C6 to C10 aryl group, a C6 to C10 aryl-C1 to C10 alkyl group, a C1 to C10 alkoxy group, An amino group or a hydroxy group. Most preferably, R is a phenoxy group and k is an integer of 1 to 3.

Non-limiting examples of phosphazenes that may be used in embodiments of the present invention include phenoxyphosphazen, propoxyphosphazene, methylphenoxyphosphazen, and the like, among which phenoxyphospazene is preferred.

The polyfunctional phosphazene can be obtained by replacing a part of functional groups with a phenoxy group, and subsequently substituting other kinds of functional groups, for example, phenoxypropoxyphosphazene. Phosphazenes are generally synthesized by the substitution reaction of chlorophosphazene with alcohols and phenols. Methods for synthesizing the linear or cyclic phosphazene compounds represented by the above general formulas (1) and (2) are known and can be synthesized according to the method described in H. R. Allcock, "Phosphorus-Nitrogen Compounds", Academic Press, (1972)

According to one embodiment of the present invention, the phosphazene compound content of k = 1 in formula (2) is preferably at least 60 wt%, more preferably at least 80 wt%, even more preferably at least 100 wt% (The total amount of the phosphazene compound having a remaining amount of k = 2 to 15 in the formula (2)) is used in an amount of 90% by weight or more. The higher the content of the phosphazene compound having k = 1, the better the stability of heat retention at high temperature in the molding process, and thus the yellowing of the resin composition during the long-term stay in the injection molding machine can be reduced. The phosphazene preferably has a phosphorus content of 10 to 15% by weight.

The amount of the phosphazene contained in the composition of the present invention is 5 to 30 parts by weight, more preferably 10 to 20 parts by weight, and even more preferably 12 to 15 parts by weight per 100 parts by weight of the base resin component. If the content of the phosphazene compound in the composition of the present invention is less than 5 parts by weight based on 100 parts by weight of the base resin component, sufficient flame retardancy can not be exhibited. If it exceeds 30 parts by weight, mechanical properties and heat resistance of the resin composition are deteriorated.

(3) Octabromo-1-phenyl-1,3,3-trimethylindan

The octabromo-1-phenyl-1,3,3-trimethylindan contained in the composition of the present invention is a compound represented by the following formula (3), which has better compatibility with aromatic polycarbonate than other halogenated compounds and has excellent color stability , It is possible to produce a thermoplastic resin composition having excellent transparency and flame retardancy that meets the object of the present invention.

(3)

In Formula 3, m and n are positive integers, and m + n = 8.

The amount of the octabromo-1-phenyl-1,3,3-trimethylindane contained in the composition of the present invention is 1 to 15 parts by weight, more preferably 5 to 12 parts by weight, per 100 parts by weight of the basic resin component, More preferably 8 to 10 parts by weight. If the content of the compound in the composition of the present invention is less than 1 part by weight per 100 parts by weight of the base resin component, sufficient flame retardancy can not be exhibited. If the amount exceeds 15 parts by weight, the mechanical properties of the resin composition deteriorate.

(4) any other component

To improve the flame retardancy, the resin composition of the present invention may further contain a flame-retardant auxiliary and a flame retardant commonly known in addition to the phosphazene and the octabromo-1-phenyl-1,3,3-trimethylindanone compound. Non-limiting examples of such components include organic phosphoric acid ester compounds, metal salt compounds, halogen containing compounds, and the like. The metal salt compounds are generally known, and all metal salt compounds suitable for a resin composition containing polycarbonate can be used in the resin composition of the present invention, and non-limiting examples thereof include organic and inorganic sulfonates (for example, Salts of sulfonesulfonates (for example, potassium salts of diphenylsulfonesulfonate), salts of perfluorinated alkylsulfonic acids, and sodium aluminum hexafluoride. Non-limiting examples of such halogen-containing compounds include decabromodiphenyl ether, octabromophenyl ether, octabromophenyl ether and tetrabromobisphenol A or nucleobibrominated polyphenylene ether, and other oligomeric Or polymeric bromine compounds. Such additional flame retardant or flame retardant aid may be used in an amount of 1 to 20 parts by weight per 100 parts by weight of the total resin composition.

In addition, the resin composition of the present invention may further contain a metal compound (for example, antimony oxide, etc.) serving as a synergist. The synergist is generally used in combination with a halogen-containing compound, and may be used in an amount of 0.1 to 10 parts by weight per 100 parts by weight of the total resin composition.

The resin composition of the present invention may further contain an inorganic filler such as silica, silicate, alumina, glass fiber, glass bead, glass flake, clay, talc, mica, calcium carbonate or the like in order to increase rigidity, heat resistance and dimensional stability Which may be used in an amount of 1 to 50 parts by weight per 100 parts by weight of the total resin composition.

The resin composition of the present invention may further contain an organic filler such as carbon fiber or carbon black to increase black color development and conductivity and may be used in an amount of 1 to 30 parts by weight per 100 parts by weight of the total resin composition have.

The resin composition of the present invention may further contain, as other processing aid, an antioxidant, a heat stabilizer, a releasing agent, a lubricant, a UV stabilizer, etc., each of which is used in an amount of 0.01 to 0.5 parts by weight per 100 parts by weight of the total resin composition .

There is no particular limitation on the method for producing the resin composition of the present invention, and a usual method for producing the resin composition can be used as it is or modified appropriately. According to one embodiment of the present invention, the resin composition of the present invention is prepared by putting the above respective components into a mixer (for example, Henschel mixer), uniformly mixing and dispersing them, and then extruding the mixture at a temperature of 240 to 270 ° C in a biaxial melt mixing extruder And can be produced in the form of pellets.

The resin composition of the present invention is excellent in transparency, color stability, flame retardancy, surface hardness and fluidity, and is excellent in mechanical strength such as impact resistance, heat resistance and excellent processability (in particular, ), The molded article is suitable for applications requiring both transparency, flame retardance and surface hardness. Therefore, according to another aspect of the present invention, there is provided a molded article produced from the flame retardant thermoplastic resin composition.

The molded article of the present invention is preferably an injection molded article, and may be a variety of office equipment such as a TV, a computer monitor, a copying machine, a printer, a notebook battery, and a lithium battery, and an electrical or electronic product housing or case. There is no particular limitation on the method for producing the molded article of the present invention, and the usual method for producing the molded resin composition can be used as it is or modified appropriately. The injection-molded article, which is one embodiment of the present invention, can be produced, for example, by injection molding the resin composition of the present invention produced in the form of pellets at a temperature of 240 to 270 ° C.

Hereinafter, the present invention will be described more specifically by way of examples and comparative examples, but the scope of the present invention is not limited by these examples.

Example

[Compound used]

(A) Polycarbonate

(A-1) linear polycarbonate derived from bisphenol-A (intrinsic viscosity: 0.50 dl / g; viscosity average molecular weight (Mv) measured in methylene chloride at 25 캜: 22,300)

(A-2) A branched polycarbonate derived from bisphenol-A (intrinsic viscosity: 0.56 dl / g; measured viscosity average molecular weight (Mv) in methylene chloride at 25 占 폚: 25,600)

(B) a methacrylate copolymer

The methacrylate copolymers (B-1 to B-5) used in Examples and Comparative Examples of the present invention were prepared as follows.

100 parts by weight of a monomer mixture containing methyl methacrylate, methyl acrylate and phenyl methacrylate monomers in the contents shown in Table 1 in a reactor equipped with a stirrer and a reflux condenser, And 150 parts by weight of deionized water were mixed. To the mixture were added 0.3 part by weight of 2,2'-azobis isobutyronitrile as an initiator, 0.1 part by weight of n-octyl mercaptan as a chain transfer agent, 2 parts by weight and sodium lactate 0.5 part by weight, and the reaction mixture was stirred for 4 hours at 80 DEG C under a nitrogen atmosphere in a suspension polymerization method. The obtained copolymer was washed with water, dehydrated and dried to obtain a bead-shaped copolymer resin. The weight average molecular weights of the obtained copolymers are shown in Table 1.

[Table 1]

(C) Phosphazene

(C-1) cyclic phosphazene compound of the following formula (R is phenoxy and SPS-100 product of Otsuka Chemical Co., Ltd., in which the content of k = 1 is 65%

(C-2) a cyclic phosphazene compound of the following formula (R is phenoxy and the content of k = 1 is 83%);

(2)

(D) Octabromo-1-phenyl-1,3,3-trimethylindane

Octabromo-1-phenyl-1,3,3-trimethylindan (FR-1808, ICL-IP).

(E) an aromatic phosphate ester compound

Bisphenol A bis (diphenylphosphate) (CR-741 manufactured by Daihachi Chemical, Japan)

(F) Halogen-substituted polycarbonate oligomer

Tetrabromobisphenol-A polycarbonate oligomer (TBBA PC oligomer, Chemtura BC-58).

[Examples 1 to 6 and Comparative Examples 1 to 8]

The prepared compounds were mixed using a Henschel mixer at the compounding ratios shown in the following Table 2 (Examples) and Table 3 (Comparative Example), uniformly dispersed, and then mixed in a biaxial melt mixing extruder having L / D = Extruded at a temperature of 240 to 270 DEG C to prepare a resin composition in the form of pellets.

The prepared composition pellets were dried in a hot-air drier at 80 to 100 ° C for 4 hours or more, and injection-molded at 240 to 270 ° C to prepare specimens. The prepared specimens were allowed to stand at 23 DEG C and 50% RH for 48 hours, and their physical properties were measured by the following methods.

[Measurement of physical properties]

(1) Pencil Hardness

Was measured by a flat plate specimen of 80 mm x 80 mm x 3 mm in width, length and thickness in accordance with JIS K-5401.

(2) Flammability

UL-94 flame retardancy test method of USA. The flame retardancy was evaluated from the burning time and the dripping property after the flame of the burner was stuck to the vertically fixed specimen of a predetermined size for 10 seconds. The burning time was the length of time for the specimen to continue the flame burning after the flame was dropped away, The printing of the cotton by a drip was determined by printing with a drop from a sample cotton pad about 300 mm below the bottom of the specimen and the flame retardancy was rated according to the following criteria.

(3) Fluidity

Measured at 300 캜 and 1.2 kgf according to ASTM D1238.

(4) Total light transmittance and haze

3 mm thick specimens were evaluated according to ASTM D1003.

(5) Color stability

A yellow index (YI, Yellowness Index) was measured by a transmission method according to ASTM D1925. At this time, in order to evaluate the color stability in the basic color and high-temperature processing conditions, the injection molding conditions were set to 270 ° C. and 300 ° C., respectively, and injection molding was performed. The basic color was evaluated by the yellow index of the specimen molded at 270 DEG C and the color stability was evaluated from the change of the yellow index of the specimen molded at 270 DEG C and 300 DEG C (DELTA YI _{300 DEG C - 270 DEG C} ).

[Table 2]

[Table 3]

As can be seen from Tables 2 and 3, Examples 1 to 6 of the present invention were excellent in transparency, coloring stability and flame retardancy, and exhibited high surface hardness and excellent fluidity at the same time.

On the other hand, in Comparative Example 1, the methacrylate copolymer was not used and the surface hardness was low. In Comparative Example 2, the methacrylate copolymer had a poor weight-average molecular weight and poor color stability. Conversely, Comparative Example 3 had a weight- Was too high and the transparency remarkably decreased. In Comparative Example 4, the methacrylate copolymer contained no aromatic methacrylate and thus had low transparency. In Comparative Example 5, the amount of the methacrylate copolymer used was too large and the flame retardancy was poor.

On the other hand, Comparative Example 6 in which TBBA PC oligomer was applied in place of octabromo-1-phenyl-1,3,3-trimethylindane showed poor flame retardance and color stability. Comparative Example 7 using only a phosphazene compound and Comparative Example 8 using a phosphoric acid ester compound also had a low flame retardancy.

Claims (9)

(1) 100 parts by weight of a base resin component comprising (A) 70 to 95% by weight of an aromatic polycarbonate resin and (B) 5 to 30% by weight of a methacrylate copolymer having a weight average molecular weight of 5,000 to 30,000;
(2) 5 to 30 parts by weight of phosphazene; And
(3) 1 to 15 parts by weight of octabromo-1-phenyl-1,3,3-trimethylindane,
From here,
Wherein the methacrylate copolymer (B) comprises 5 to 50% by weight of copolymerized units of aromatic methacrylate and 50 to 95% by weight of copolymerized units of alkyl methacrylate based on 100% by weight of the copolymer (B)
The phosphazene compound (2) is at least one selected from a linear phosphazene compound represented by the following formula (1) and a cyclic phosphazene compound represented by the following formula (2)
The octabromo-1-phenyl-1,3,3-trimethylindan (3)
Flame retardant thermoplastic resin composition:
[Chemical Formula 1]

(2)

(3)

Wherein R is the same or different from each other and independently represents an alkyl group, an aryl group, an alkyl-substituted aryl group, an aralkyl group, an alkoxy group, an aryloxy group, an amino group or a hydroxy group, k is an integer of 1 to 15 ; In Formula 3, m and n are positive integers, and m + n = 8. The flame-retardant thermoplastic resin composition according to claim 1, wherein the aromatic polycarbonate resin (A) comprises 10 to 50% by weight of the branched polycarbonate resin in 100% by weight of the total aromatic polycarbonate resin. The method of claim 1 wherein said alkyl methacrylate is selected from methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, and isobutyl methacrylate Wherein the flame retardant thermoplastic resin composition is at least one flame retardant thermoplastic resin composition. The flame-retardant thermoplastic resin composition according to claim 1, wherein the aromatic methacrylate is at least one selected from phenyl methacrylate, naphthyl methacrylate, and benzyl methacrylate. (1) 100 parts by weight of a base resin component comprising (A) 70 to 95% by weight of an aromatic polycarbonate resin and (B) 5 to 30% by weight of a methacrylate copolymer having a weight average molecular weight of 5,000 to 30,000;
(2) 5 to 30 parts by weight of phosphazene; And
(3) 1 to 15 parts by weight of octabromo-1-phenyl-1,3,3-trimethylindane,
From here,
The methacrylate copolymer (B) is obtained by copolymerizing 5 to 45% by weight of copolymerized units of aromatic methacrylate and 50 to 90% by weight of copolymerized units of alkyl methacrylate with respect to 100% by weight of the copolymer (B) C6 < / RTI > alkyl acrylate,
The phosphazene compound (2) is at least one selected from a linear phosphazene compound represented by the following formula (1) and a cyclic phosphazene compound represented by the following formula (2)
The octabromo-1-phenyl-1,3,3-trimethylindan (3)
Flame retardant thermoplastic resin composition:
[Chemical Formula 1]

(2)

(3)

Wherein R is the same or different from each other and independently represents an alkyl group, an aryl group, an alkyl-substituted aryl group, an aralkyl group, an alkoxy group, an aryloxy group, an amino group or a hydroxy group, k is an integer of 1 to 15 ; In Formula 3, m and n are positive integers, and m + n = 8. The flame-retardant thermoplastic resin composition according to claim 5, wherein the alkyl methacrylate is methyl methacrylate, the C1-C6 alkyl acrylate is methyl acrylate, and the aromatic methacrylate is phenyl methacrylate. The flame-retardant thermoplastic resin composition according to claim 1, wherein the phosphazene compound (2) is a cyclic phosphazene compound represented by the formula (2), wherein R is a phenoxy group. The phosphazene compound (2) according to claim 1, wherein the phosphazene compound (2) is represented by the formula (2), wherein the cyclic phosphazene compound having k = 1 is contained in an amount of 60 wt% Flame retardant thermoplastic resin composition. A molded article produced from the flame retardant thermoplastic resin composition according to any one of claims 1 to 8.