Patent Description:
Conventionally, metallic materials are used as interior and exterior materials for transportation facilities, such as automobiles, railroad vehicles, and the like. In recent years, however, with increasing demand for improvement in fuel efficiency, various studies have been actively made to replace the metallic materials with lightweight plastic materials. For stability of passengers, materials for transportation facilities are strictly required to have low flammability, flame retardancy, low heat-generation characteristics, low smoke toxicity, and the like in order to prevent or reduce generation of smoke upon fire generation.

A polycarbonate resin has good properties in terms of formability, mechanical properties comprising impact resistance and tensile strength, electrical properties, transparency, and the like, and thus is broadly used in automobile and electronic products. Conventionally, a thermoplastic resin composition prepared by blending the polycarbonate resin with an acrylonitrile-butadiene-styrene (ABS) resin, followed by adding a phosphorus-based flame retardant to the mixture is used. Despite good properties in terms of formability, heat resistance, moisture resistance, impact resistance, and flame resistance, such a thermoplastic resin composition is not suitable for transportation facilities due to generation of an excess of smoke upon combustion thereof. For this reason, a polyimide resin or a polyamide resin is generally used in the field of transportation. However, the polyimide resin and the polyamide resin have disadvantages, such as high price, poor formability, and poorer mechanical properties than a polycarbonate resin.

Therefore, there is a need for development of a thermoplastic resin composition that has no smoke toxicity and exhibits good properties in terms of flame retardancy, low heat-generation characteristics, low flammability, and the like while maintaining good properties in terms of impact resistance, heat resistance and formability of a polycarbonate resin.

The background technique of the present invention is disclosed in <CIT> and the like. <CIT> discloses polycarbonate resin compositions having excellent flame retardancy.

It is one object of the present invention to provide a thermoplastic resin composition that has no smoke toxicity and exhibits good properties in terms of flame retardancy, low heat-generation characteristics, low flammability, and the like.

It is another object of the present invention to provide a molded product formed of the thermoplastic resin composition.

The above and other objects of the present invention can be achieved by the present invention described below.

The present invention provides a thermoplastic resin composition that has no smoke toxicity and exhibits good properties in terms of flame retardancy, low heat-generation characteristics, low flammability, and the like, and a molded product produced therefrom.

A thermoplastic resin composition according to the present invention consists essentially of : (A) a polycarbonate resin; (B) a core-shell structured rubber-modified vinyl graft copolymer; (C) zinc borate; (D) bisphenol-A bis(diphenyl phosphate); (E) biphenol bis(diphenyl phosphate); and (F) flake-shaped inorganic fillers.

The polycarbonate resin according to one embodiment of the invention may comprise any polycarbonate resin used in typical thermoplastic resin compositions. For example, the polycarbonate resin may be an aromatic polycarbonate resin prepared by reacting a diphenol (aromatic diol compound) with a carbonate precursor, such as phosgene, halogen formate, and carbonate diester.

In some embodiments, the diphenol may comprise, for example, <NUM>,<NUM>'-biphenol, <NUM>,<NUM>-bis(<NUM>-hydroxyphenyl)propane, <NUM>,<NUM>-bis(<NUM>-hydroxyphenyl)-<NUM>-methylbutane, <NUM>,<NUM>-bis(<NUM>-hydroxyphenyl)cyclohexane, <NUM>,<NUM>-bis(<NUM>-chloro-<NUM>-hydroxyphenyl)propane, <NUM>,<NUM>-bis(<NUM>,<NUM>-dichloro-<NUM>-hydroxyphenyl)propane, <NUM>,<NUM>-bis(<NUM>-methyl-<NUM>-hydroxyphenyl)propane, and <NUM>,<NUM>-bis(<NUM>,<NUM>-dimethyl-<NUM>-hydroxyphenyl)propane, without being limited thereto. For example, the diphenol may be <NUM>,<NUM>-bis(<NUM>-hydroxyphenyl)propane, <NUM>,<NUM>-bis(<NUM>,<NUM>-dichloro-<NUM>-hydroxyphenyl)propane, <NUM>,<NUM>-bis(<NUM>-methyl-<NUM>-hydroxyphenyl)propane, <NUM>,<NUM>-bis(<NUM>,<NUM>-dimethyl-<NUM>-hydroxyphenyl)propane, or <NUM>,<NUM>-bis(<NUM>-hydroxyphenyl)cyclohexane, specifically <NUM>,<NUM>-bis(<NUM>-hydroxyphenyl)propane, which is also referred to as bisphenol-A.

In some embodiments, the carbonate precursor may comprise, for example, dimethyl carbonate, diethyl carbonate, dibutyl carbonate, dicyclohexyl carbonate, diphenyl carbonate, ditolyl carbonate, bis(chlorophenyl) carbonate, m-cresyl carbonate, dinaphthyl carbonate, carbonyl chloride (phosgene), diphosgene, triphosgene, carbonyl bromide, bishaloformate, and the like. These may be used alone or as a mixture thereof.

The polycarbonate resin may be a branched polycarbonate resin. For example, the polycarbonate resin may be prepared by adding a tri- or higher polyfunctional compound, specifically, a tri- or higher valent phenol group-containing compound, in an amount of about <NUM> mol% to about <NUM> mol% based on the total number of moles of the diphenols used in polymerization.

In some embodiments, the polycarbonate resin may be a homopolycarbonate resin, a copolycarbonate resin, or a blend thereof. In addition, the polycarbonate resin may be partly or completely replaced by an aromatic polyester-carbonate resin obtained by polymerization in the presence of an ester precursor, for example, a bifunctional carboxylic acid.

In some embodiments, the polycarbonate resin may have a weight average molecular weight (Mw) of about <NUM>,<NUM>/mol to about <NUM>,<NUM>/mol, for example, about <NUM>,<NUM>/mol to about <NUM>,<NUM>/mol, as measured by gel permeation chromatography (GPC). Within this range, the thermoplastic resin composition can exhibit good properties in terms of impact resistance, rigidity, heat resistance, and the like. The polycarbonate resin may be a mixture of at least two polycarbonate resins having different weight average molecular weights.

The core-shell structured rubber-modified vinyl graft copolymer according to one embodiment serves to improve impact resistance, flame retardancy and the like of the thermoplastic resin composition and may be prepared by graft polymerization of a vinyl monomer (alkyl (meth)acrylate monomer and the like) to a rubber polymer. Here, polymerization may be performed by any polymerization method known in the art, such as emulsion polymerization, suspension polymerization, and the like. The core-shell structured rubber-modified vinyl graft copolymer may have a core (rubber polymer)-shell (polymer of the vinyl monomer) structure.

In some embodiments, the rubber polymer may comprise silicone rubbers (robber polymer), diene rubbers, such as polybutadiene, poly(styrene-butadiene), and poly(acrylonitrile-butadiene), saturated rubbers obtained by adding hydrogen to the diene rubbers, isoprene rubbers, C<NUM> to C<NUM> alkyl (meth)acrylate rubbers, copolymers of C<NUM> to C<NUM> alkyl (meth)acrylate rubbers and styrene, ethylene-propylene-diene terpolymer (EPDM), and the like. These may be used alone or as a mixture thereof.

In some embodiments, the silicone rubber polymer may be prepared through polymerization of a rubber monomer comprising a silicone-based monomer, such as cyclosiloxane and the like. The cyclosiloxane may comprise, for example, hexamethylcyclotri siloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, trimethyltriphenylcyclotrisiloxane, tetramethyltetraphenylcyclotetrasiloxane, octaphenylcyclotetrasiloxane, and the like. Here, trimethoxymethylsilane, triethoxyphenylsilane, tetramethoxysilane, or tetraethoxysilane may be used as a curing agent. The silicone rubber polymer may be a silicone-based acrylate rubber, such as polydimethylsiloxane/butyl acrylate rubber (PDMS/BA) and the like.

In some embodiments, the rubber polymer (rubber particles) may have an average particle diameter (D50) of about <NUM> to about <NUM>, for example, about <NUM> to about <NUM>, specifically about <NUM> to about <NUM>. Within this range, the thermoplastic resin composition can have good impact resistance, appearance characteristics, and the like. Here, the average particle diameter of the rubber polymer may be measured by a dry method using a Mastersizer 2000E series (Malvern Co.

In some embodiments, the vinyl monomer may be selected from among an alkyl (meth)acrylate monomer, an aromatic vinyl monomer, and combinations thereof.

In some embodiments, the alkyl (meth)acrylate monomer may be graft polymerizable with the rubber polymer and may comprise methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, and epoxy group-containing alkyl (meth)acrylate monomers, such as glycidyl (meth)acrylate and the like. These may be used alone or as a mixture thereof.

In some embodiments, the aromatic vinyl monomer may be graft copolymerizable with the rubber polymer and may comprise, for example, styrene, α-methylstyrene, β-methylstyrene, p-methylstyrene, p-t-butylstyrene, ethylstyrene, vinylxylene, monochlorostyrene, dichlorostyrene, dibromostyrene, vinyl naphthalene, and the like. These may be used alone or as a mixture thereof.

In some embodiments, the core-shell structured rubber-modified vinyl graft copolymer may comprise a graft copolymer, g-ABS, and the like, which are obtained through graft polymerization of the alkyl (meth)acrylate monomer to the silicone rubber polymer.

In some embodiments, the rubber polymer may be present in an amount of about <NUM> wt% to about <NUM> wt%, for example, about <NUM> wt% to about <NUM> wt%, and the vinyl monomer may be present in an amount of about <NUM> wt% to about <NUM> wt%, for example, about <NUM> wt% to about <NUM> wt%, based on <NUM> wt% of the core-shell structured rubber-modified vinyl graft copolymer. Within this range, the thermoplastic resin composition can exhibit good impact resistance, flame retardancy, and the like.

The core-shell structured rubber-modified vinyl graft copolymer may be present in an amount of about <NUM> to about <NUM> parts by weight, for example, about <NUM> to about <NUM> parts by weight, relative to about <NUM> parts by weight of the polycarbonate resin. If the content of the core-shell structured rubber-modified vinyl graft copolymer is less than about <NUM> parts by weight relative to about <NUM> parts by weight of the polycarbonate resin, the thermoplastic resin composition can suffer from deterioration in impact resistance, low heat-generation characteristics, low flammability, and the like, and if the content of the core-shell structured rubber-modified vinyl graft copolymer exceeds about <NUM> parts by weight, the thermoplastic resin composition can suffer from deterioration in appearance characteristics, formability, low flammability, and the like.

According to one embodiment, zinc borate serves to improve flame retardancy, low heat-generation characteristics, low flammability, and the like of the thermoplastic resin composition in conjunction with bisphenol-A bis(diphenyl phosphate) and biphenol bis(diphenyl phosphate), and may comprise zinc borate (anhydride), zinc borate hydrate, and combinations thereof.

In some embodiments, the metal zinc borate may have various shapes and sizes. For example, the metal inorganic compound may have an average particle size (D50) of about <NUM> to about <NUM>, for example, about <NUM> to about <NUM>, as measured by a method for laser diffraction measurement of a particle size.

The zinc borate may be present in an amount of about <NUM> to about <NUM> parts by weight, for example, about <NUM> to about <NUM> parts by weight, relative to about <NUM> parts by weight of the polycarbonate resin. If the content of the zinc borate is less than about <NUM> parts by weight relative to about <NUM> parts by weight of the polycarbonate resin, the thermoplastic resin composition can suffer from deterioration in low heat-generation characteristics, low flammability, and the like, and if the content of the zinc borate exceeds about <NUM> parts by weight, the thermoplastic resin composition can suffer from deterioration in impact resistance and the like.

According to one embodiment, bisphenol-A bis(diphenyl phosphate) serves to improve flame retardancy, low heat-generation characteristics, low flammability, and the like of the thermoplastic resin composition in conjunction with zinc borate and biphenol bis(diphenyl phosphate), and may contain about <NUM> wt% to about <NUM> wt%, for example, about <NUM> wt% to about <NUM> wt%, of phosphorus (P), based on <NUM> wt% of the total compound.

The bisphenol-A bis(diphenyl phosphate) may be present in an amount of about <NUM> to about <NUM> parts by weight, for example, about <NUM> to about <NUM> parts by weight, relative to about <NUM> parts by weight of the polycarbonate resin. If the content of the bisphenol-A bis(diphenyl phosphate) is less than about <NUM> parts by weight relative to about <NUM> parts by weight of the polycarbonate resin, the thermoplastic resin composition can suffer from deterioration in low heat-generation characteristics, low flammability, and the like, and if the content of the bisphenol-A bis(diphenyl phosphate) exceeds about <NUM> parts by weight, the thermoplastic resin composition can suffer from deterioration in low flammability, impact resistance, and the like.

According to one embodiment, biphenol bis(diphenyl phosphate) serves to improve flame retardancy, low heat-generation characteristics, low flammability, and the like of the thermoplastic resin composition in conjunction with zinc borate and bisphenol-A bis(diphenyl phosphate), and may contain about <NUM> wt% to about <NUM> wt%, for example, about <NUM> wt% to about <NUM> wt%, of phosphorus (P), based on <NUM> wt% of the total compound.

The biphenol bis(diphenyl phosphate) may be present in an amount of about <NUM> to about <NUM> parts by weight, for example, about <NUM> to about <NUM> parts by weight, relative to about <NUM> parts by weight of the polycarbonate resin. If the content of the biphenol bis(diphenyl phosphate) is less than about <NUM> parts by weight relative to about <NUM> parts by weight of the polycarbonate resin, the thermoplastic resin composition can suffer from deterioration in low heat-generation characteristics, low flammability, and if the content of the biphenol bis(diphenyl phosphate) exceeds about <NUM> parts by weight, the thermoplastic resin composition can suffer from deterioration in low flammability, impact resistance, heat resistance, and the like.

In some embodiments, the weight ratio (C:D+E) of the zinc borate (C) to the sum of the bisphenol-A bis(diphenyl phosphate) (D) and the biphenol bis(diphenyl phosphate) (E) may range from about <NUM>:<NUM> to about <NUM>:<NUM>, for example, from about <NUM>:<NUM> to about <NUM>:<NUM>. Within this range, the thermoplastic resin composition can exhibit good properties in terms of flame retardancy, low heat-generation characteristics, low flammability, and the like.

In some embodiments, the weight ratio (D:E) of the bisphenol-A bis(diphenyl phosphate) (D) to the biphenol bis(diphenyl phosphate) (E) may range from about <NUM>:<NUM> to about <NUM>:<NUM>, for example, about <NUM>:<NUM> to about <NUM>:<NUM>. Within this range, the thermoplastic resin composition can exhibit good properties in terms of flame retardancy, low heat-generation characteristics, low flammability, and the like.

According to one embodiment, the flake-shaped inorganic fillers prevent decomposed flammable materials of a resin from being discharged from the surface of the resin upon combustion of the resin composition to improve flame retardancy, low heat-generation characteristics and low flammability while improving rigidity thereof, and may comprise typical flake-shaped inorganic fillers.

In some embodiments, the flake-shaped inorganic fillers may comprise talc, mica, and combinations thereof. For example, typical flake-shaped talc may be used. The flake-shaped inorganic fillers may have an average particle size of about <NUM> to about <NUM>, for example, about <NUM> to about <NUM>, as measured using a Malvern Mastersizer <NUM>. Within this range, the thermoplastic resin composition can exhibit good properties in terms of flame retardancy, rigidity, fluidity, appearance characteristics, and the like.

The flake-shaped inorganic fillers may be present in an amount of about <NUM> parts by weight to about <NUM> parts by weight, for example, about <NUM> parts by weight to about <NUM> parts by weight, relative to about <NUM> parts by weight of the polycarbonate resin. If the content of the flake-shaped inorganic fillers is less than about <NUM> parts by weight relative to about <NUM> parts by weight of the polycarbonate resin, the thermoplastic resin composition can suffer from deterioration in low heat-generation characteristics, low flammability, and the like, and if the content of the flake-shaped inorganic fillers exceeds about <NUM> parts by weight, the thermoplastic resin composition can suffer from deterioration in appearance characteristics, impact resistance, and the like.

The thermoplastic resin composition according to one embodiment may be prepared by a typical preparation method known in the art. For example, the thermoplastic resin composition may be prepared in pellet form by mixing the aforementioned components and other additives, as needed, followed by melt extrusion at about <NUM> to about <NUM>, for example, about <NUM> to about <NUM>, using a typical twin-screw extruder.

In some embodiments, the thermoplastic resin composition may have a flame retardancy of V0 or higher, as measured on a <NUM> thick specimen by a UL-<NUM> vertical test method.

The thermoplastic resin composition has a maximum average rate of heat emission (MARHE) of about <NUM> kW/m<NUM> to about <NUM> kW/m<NUM>, for example, about <NUM> kW/m<NUM> to about <NUM> kW/m<NUM>, as measured on a specimen having a size of <NUM> x <NUM> x <NUM> to <NUM> at a heat quantity of <NUM> kW/m<NUM> in accordance with ISO <NUM>-<NUM>.

In some embodiments, the thermoplastic resin composition may have a specific optical density at <NUM> (Ds(<NUM>)) of about <NUM> to about <NUM> (a. (arbitrary unit)), for example, about <NUM> to about <NUM>, as measured on a specimen having a size of <NUM> x <NUM> x <NUM> to <NUM> at a heat quantity of <NUM> kW/m<NUM> in accordance with ISO <NUM>-<NUM>.

In some embodiments, the thermoplastic resin composition may have a cumulative value of specific optical densities in the first <NUM> of the test (VOF(<NUM>)) of about <NUM> to about <NUM>, for example, about <NUM> to about <NUM>, as measured on a specimen having a size of <NUM> x <NUM> x <NUM> to <NUM> at a heat quantity of <NUM> kW/m<NUM> in accordance with ISO <NUM>-<NUM>.

In some embodiments, the thermoplastic resin composition may have a smoke toxicity (CIT, conventional index of toxicity) of about <NUM> to about <NUM> (a. (arbitrary unit)), for example, about <NUM> to about <NUM>, as measured on a specimen having a size of <NUM> x <NUM> x <NUM> to <NUM> at a heat quantity of <NUM> kW/m<NUM> in accordance with ISO <NUM>-<NUM>.

In some embodiments, the thermoplastic resin composition may have a notched Izod impact strength of about <NUM> kgf·cm/cm to about <NUM> kgf·cm/cm, for example, about <NUM> kgf·cm/cm to about <NUM> kgf·cm/cm, as measured on a <NUM> thick specimen in accordance with ASTM D256.

A molded product according to the present invention is produced from the thermoplastic resin composition as set forth above. The thermoplastic resin composition may be produced into various products (articles) by various molding methods, such as injection molding, extrusion molding, vacuum molding, and casting. These molding methods are well known to those skilled in the art. The molded product exhibits good properties in terms of flame retardancy, low heat-generation characteristics, low flammability, and the like, has no smoke toxicity, and satisfies EN45545-<NUM> R6HL2 (European railway standard for fire safety). The molded product can be advantageously used as interior or exterior materials for transportation facilities, such as automobile parts and railway vehicle components.

Next, the present invention will be described in more detail with reference to some examples. It should be understood that these examples are provided for illustration only and are not to be construed in any way as limiting the invention.

Details of components used in Examples and Comparative Examples are as follows.

A bisphenol-A polycarbonate resin (weight average molecular weight (Mw): <NUM>,<NUM>/mol) was used.

(B1) A silicone-based core-shell impact modifier (Manufacturer: MRC, Product Name: SX-<NUM>) prepared by graft polymerization of an acrylic monomer to a silicone rubber polymer was used as a core-shell structured rubber-modified vinyl graft copolymer.

(B2) An ethylene/methyl acrylate copolymer (Manufacturer: Dupont, Product Name: Elvaloy AC1330) was used.

(C1) Zinc borate (anhydride) (Manufacturer: Rio Tinto Minerals, Product Name: Firebrake <NUM>) was used.

(C2) Zinc borate hydrate (Manufacturer: Rio Tinto Minerals, Product Name: Firebrake <NUM>) was used.

(C3) Aluminum hydride (Manufacturer: Daemyung Chemical) was used.

Bisphenol-A bis(diphenyl phosphate) (Manufacturer: Daihachi, Product Name: CR-<NUM>) containing <NUM> wt% of phosphorus was used.

Biphenol bis(diphenyl phosphate) (Manufacturer: Adeka, Product Name: FP-<NUM>) containing <NUM> wt% of phosphorus was used.

(F) Resorcinol diphenyl phosphate (Manufacturer: Daihachi, Product Name: CR733) was used.

(G1) Talc (Manufacturer: Imi-Fabi, Product Name: HTP05L) was used as flake-shaped inorganic fillers.

(G2) Whisker (Manufacturer: Otsuka, Product Name: TISMO-D) was used as acicular inorganic fillers.

The above components were prepared in amounts as listed in Tables <NUM>, <NUM>, <NUM> and <NUM>, and mixed with <NUM> part by weight of an anti-dripping agent (PTFE, GCC Korea, AD-<NUM>), <NUM> parts by weight of an antioxidant (Songwon Industry, SONGNOX-<NUM> and Miwon Commercial. ALKANOX <NUM>) and <NUM> parts by weight of a release agent (Hengel, LOXIOL EP-<NUM>) relative to <NUM> parts by weight of a polycarbonate resin, followed by extrusion under conditions of <NUM>, thereby preparing pellets. Extrusion was performed using a twin-screw extruder (L/D=<NUM>, Φ: <NUM>) and the prepared pellets were dried at <NUM> for <NUM> hours or more and injection-molded in a <NUM>-ton injection molding machine (molding temperature: <NUM>, mold temperature: <NUM>), thereby preparing specimens. The prepared specimens were evaluated as to the following properties by the following method, and results are shown in Tables <NUM>, <NUM>, <NUM> and <NUM>.

From the result, it could be seen that the thermoplastic resin compositions according to the present invention exhibited good properties in terms of flame retardancy, low heat-generation characteristics (MARHE), low flammability (DS(<NUM>), VOF(<NUM>)), smoke toxicity (CIT), and the like without deterioration in impact resistance, fluidity, heat resistance, and the like.

Conversely, it could be seen that the thermoplastic resin composition prepared using an insufficient amount of the core-shell structured rubber-modified vinyl graft copolymer (Comparative Example <NUM>) exhibited deterioration in low heat-generation characteristics, low flammability, impact resistance, and the like; the thermoplastic resin composition prepared using an excess of the core-shell structured rubber-modified vinyl graft copolymer (Comparative Example <NUM>) exhibited deterioration in low flammability and the like; and the thermoplastic resin composition prepared using the ethylene/methyl acrylate impact modifier (B2) instead of the core-shell structured rubber-modified vinyl graft copolymer (Comparative Example <NUM>) suffered from deterioration in flame retardancy, low heat-generation characteristics, low flammability, and the like. In addition, it could be seen that the thermoplastic resin composition prepared using an insufficient amount of the zinc borate (Comparative Example <NUM>) suffered from deterioration in low heat-generation characteristics, low flammability, and the like; the thermoplastic resin composition prepared using an excess of the zinc borate (Comparative Example <NUM>) suffered from deterioration in impact resistance, and the like; and the thermoplastic resin composition prepared using aluminum hydride (C3) instead of the zinc borate (Comparative Example <NUM>) suffered from deterioration in low heat-generation characteristics, low flammability, impact resistance, and the like. In addition, it could be seen that the thermoplastic resin composition prepared using an insufficient amount of the bisphenol-A bis(diphenyl phosphate) (Comparative Example <NUM>) suffered from deterioration in low heat-generation characteristics, low flammability, and the like; the thermoplastic resin composition prepared using an excess of the bisphenol-A bis(diphenyl phosphate) (Comparative Example <NUM>) suffered from deterioration in low flammability, impact resistance, and the like; the thermoplastic resin composition prepared using an insufficient amount of the biphenol bis(diphenyl phosphate) (Comparative Example <NUM>) suffered from deterioration in low heat-generation characteristics, low flammability, and the like; the thermoplastic resin composition prepared using an excess of the biphenol bis(diphenyl phosphate) (Comparative Example <NUM>) suffered from deterioration in low flammability, impact resistance, and the like; the thermoplastic resin composition prepared using resorcinol diphenyl phosphate (F) (Comparative Example <NUM>) instead of the bisphenol-A bis(diphenyl phosphate) (D) and the biphenol bis(diphenyl phosphate) (E) suffered from deterioration in low heat-generation characteristics, low flammability, and the like; and the thermoplastic resin composition prepared using the bisphenol-A bis(diphenyl phosphate) (D) alone (Comparative Example <NUM>) suffered from deterioration in low heat-generation characteristics, and the like. Further, it could be seen that the thermoplastic resin composition prepared using an insufficient amount of the flake-shaped inorganic fillers (Comparative Example <NUM>) suffered from deterioration in low heat-generation characteristics, low flammability, and the like; the thermoplastic resin composition prepared using an excess of the flake-shaped inorganic fillers (Comparative Example <NUM>) suffered from deterioration in impact resistance and the like; and the thermoplastic resin composition prepared using whisker (F2) as acicular inorganic fillers (Comparative Example <NUM>) instead of the flake-shaped inorganic fillers suffered from deterioration in low heat-generation characteristics, low flammability, and the like.

Claim 1:
A thermoplastic resin composition consisting essentially of:
<NUM> parts by weight of a polycarbonate resin;
<NUM> parts by weight to <NUM> parts by weight of a core-shell structured rubber-modified vinyl graft copolymer;
<NUM> parts by weight to <NUM> parts by weight of zinc borate;
<NUM> parts by weight to <NUM> parts by weight of bisphenol-A bis(diphenyl phosphate);
<NUM> parts by weight to <NUM> parts by weight of biphenol bis(diphenyl phosphate); and
<NUM> parts by weight to <NUM> parts by weight of flake-shaped inorganic fillers,
wherein the thermoplastic resin composition has a maximum average rate of heat emission (MARHE) of <NUM> kW/m<NUM> to <NUM> kW/m<NUM>, as measured on a specimen having a size of <NUM> x <NUM> x <NUM> to <NUM> at a heat quantity of <NUM> kW/m<NUM> in accordance with ISO <NUM>-<NUM>.