KR20210067097A - Flame retarding polycarbonate alloy resin composition - Google Patents

Abstract

Disclosed is a flame-retardant polycarbonate alloy resin composition which improves heat resistance pointed out as a disadvantage of conventional flame-retardant polycarbonate, and is suitable for application to large-size injection molded products or parts requiring high heat resistance by minimizing the deterioration of physical properties due to addition of flame retardants. The present invention provides the flame-retardant polycarbonate alloy resin composition which comprises 15 to 50 parts by weight of polycarbonate, 12 to 40 parts by weight of a polysiloxane-carbonate copolymer, 5 to 25 parts by weight of polyarylate, and 1 to 15 parts by weight of a solid polymer flame retardant.

Description

Flame retarding polycarbonate alloy resin composition

The present invention relates to a flame-retardant polycarbonate alloy resin composition, and more particularly, to a flame-retardant polycarbonate alloy resin composition having excellent heat resistance.

Polycarbonate is used for various purposes such as housing materials for electrical and electronic products due to its excellent characteristics such as impact resistance and heat resistance. When applied as a housing material for electrical and electronic products, inorganic reinforced polycarbonate is used for reasons of heat resistance, flame retardancy, and dimensional stability. is being applied Such materials include, for example, a housing (TV frame, Casetop) of a large molded product, and parts of a digital camera lens.

In this inorganic reinforced polycarbonate, glass fiber is used in the case of rigidity, and in the case of flame retardancy, it can be improved by mainly using a liquid flame retardant, but due to deterioration of physical properties such as fluidity, heat resistance, impact strength, etc., large-sized injection products Alternatively, there is a problem in that it is not suitable for use in parts requiring high heat resistance.

Korean Patent Application Laid-Open No. 2008-0071970 discloses a resin composition containing a polyarylate resin and a polycarbonate resin, and a resin containing spherical silica, which has heat resistance and high rigidity, but is applied to housings of electrical and electronic products, etc. There is no mention about the flame retardancy required for this.

Korean Patent Application Laid-Open No. 2015-0091282 discloses a resin composition with improved flame retardancy compared to conventional glass fiber reinforced polycarbonate resins by improving rigidity by adding glass fibers to polycarbonate, and using a flame retardant and an inorganic material at the same time. There is a problem in that heat resistance is insufficient to control the heat generated when it is applied as a housing of a product.

Korean Patent Application Laid-Open No. 2015-0081989 discloses a polycarbonate-based resin composition with improved heat resistance and dimensional stability by including inorganic fillers in polycarbonate and polyarylate alloy. They are not aware of the problems of fluidity and flame retardancy due to this.

The present invention improves heat resistance, which is pointed out as a disadvantage of conventional flame-retardant polycarbonate, and minimizes deterioration of physical properties due to the addition of flame retardant to provide a flame-retardant polycarbonate resin composition suitable for application to large-sized injection products or parts requiring high heat resistance. .

In order to solve the above problems, the present invention includes 15 to 50 parts by weight of a polycarbonate, 12 to 40 parts by weight of a polysiloxane-carbonate copolymer, 5 to 25 parts by weight of a polyarylate, and 1 to 15 parts by weight of a solid polymer flame retardant. A flame retardant polycarbonate alloy resin composition is provided.

In addition, the polycarbonate and the polysiloxane-carbonate copolymer provides a flame-retardant polycarbonate alloy resin composition, characterized in that it is included in a weight ratio of 1:1.7 to 3:1.

In addition, the polysiloxane-carbonate copolymer provides a flame-retardant polycarbonate alloy resin composition comprising 1 to 50% by weight of a siloxane repeating unit represented by the following Chemical Formula 1.

[Formula 1]

In Formula 1, R ₁ and R ₂ are each independently hydrogen, a substituted or unsubstituted C 1 to C 20 alkyl group or C 6 to C 20 aryl group, and a is an integer from 2 to 10,000.

In addition, the solid polymer flame retardant provides a flame-retardant polycarbonate alloy resin composition comprising a repeating unit represented by the following formula (2).

[Formula 2]

In Formula 2, X is an alkylene group having 1 to 10 carbon atoms, n is an integer of 6 to 20, and m is an integer of 1 to 20.

In addition, the solid polymer flame retardant has a weight average molecular weight (Mw) of 1,000 to 100,000 g / mol, and a glass transition temperature (Tg) of 80 to 130 ℃ It provides a flame retardant polycarbonate alloy resin composition, characterized in that .

In addition, the resin composition provides a flame-retardant polycarbonate alloy resin composition further comprising 1 to 10% by weight of an impact modifier having a core-shell structure and 5 to 25% by weight of an inorganic filler.

According to the present invention, by adding polysiloxane-carbonate copolymer to polycarbonate, flame retardancy can be maintained even when the flame retardant content is reduced, and heat resistance is improved, and flame retardancy is imparted by excluding the existing liquid flame retardant and adding a solid polymer flame retardant It is possible to provide a flame-retardant polycarbonate resin composition suitable for application to large-size injection molded products or parts requiring high heat resistance by preventing a decrease in fluidity, heat resistance, and impact strength while being used.

Hereinafter, preferred embodiments of the present invention will be described in detail. In describing the present invention, if it is determined that a detailed description of a related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted. Throughout the specification, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated.

The inventors of the present invention face a situation where there is a limit to the application of large-sized injection products or parts requiring high heat resistance due to the decrease in physical properties such as fluidity, heat resistance and impact strength when a flame retardant is added to the conventional polycarbonate to impart flame retardancy and research As a result, when a polysiloxane-carbonate copolymer of a specific composition and a solid polymer flame retardant are added to polycarbonate, it prevents a decrease in fluidity, heat resistance and impact strength while maintaining flame retardancy, so that large-size injection products or high heat resistance are required. It has been found suitable for application to parts and has led to the present invention.

Accordingly, the present invention provides a flame retardant polycarbonate alloy comprising 15 to 50 parts by weight of polycarbonate, 12 to 40 parts by weight of polysiloxane-carbonate copolymer, 5 to 25 parts by weight of polyarylate, and 1 to 15 parts by weight of a solid polymer flame retardant. Disclosed is a resin composition.

Hereinafter, each component of the flame-retardant polycarbonate alloy resin composition according to the present invention will be described in more detail.

(A) polycarbonate

Polycarbonate (PC) used in the present invention has excellent impact resistance, heat resistance, weather resistance, self-extinguishing properties, flexibility, processability and transparency, excellent weather resistance, maintaining high physical properties for a long period of time, excellent heat resistance and cold resistance, severe temperature change still maintain performance.

The polycarbonate is obtained by reacting a bisphenol-based monomer with a carbonate precursor, and examples of the reaction method include an interfacial polymerization method, a melt transesterification method, a solid-phase transesterification method of a carbonate prepolymer, and a ring-opening polymerization method of a cyclic carbonate compound.

The bispinol-based monomer is bis(4-hydroxyphenyl)methane, bis(4-hydroxyphenyl)ether, bis(4-hydroxyphenyl)sulfone, bis(4-hydroxyphenyl)sulfoxide, bis(4 -Hydroxyphenyl)sulfide, bis(4-hydroxyphenyl)ketone, 1,1-bis(4-hydroxyphenyl)ethane, 2,2-bis(4-hydroxyphenyl)propane (bisphenol A; BPA) , 2,2-bis(4-hydroxyphenyl)butane, 1,1-bis(4-hydroxyphenyl)cyclohexane (bisphenol Z; BPZ), 2,2-bis(4-hydroxy-3,5 -dibromophenyl) propane, 2,2-bis (4-hydroxy-3,5-dichlorophenyl) propane, 2,2-bis (4-hydroxy-3-bromophenyl) propane, 2,2 -bis(4-hydroxy-3chlorophenyl)propane, 2,2-bis(4-hydroxy-3-methylphenyl)propane, 2,2-bis(4-hydroxy-3,5-dimethylphenyl)propane , 1,1-bis(4-hydroxyphenyl)-1-phenylethane, bis(4-hydroxyphenyl)diphenylmethane and α,ω-bis[3-(ο-hydroxyphenyl)propyl]polydimethyl It may be at least one selected from the group consisting of siloxane.

In addition, the carbonate precursor is dimethyl carbonate, diethyl carbonate, dibutyl carbonate, dicyclohexyl carbonate, diphenyl carbonate, ditoryl carbonate, bis (chlorophenyl) carbonate, m- cresyl carbonate, dinaphthyl carbonate, bis ( diphenyl) carbonate, carbonyl chloride (phosgene), triphosgene, diphosgene, carbonyl bromide, and bishaloformate may be at least one selected from the group consisting of.

In the present invention, the polycarbonate may have a weight average molecular weight (Mw) of 10,000 to 200,000 g/mol, preferably 15,000 to 50,000 g/mol. In addition, branched chain ones may be used, preferably by adding 0.05 to 2 mol% of a tri- or more polyfunctional compound, for example, a compound having a trivalent or more phenolic group, based on the total amount of diphenol used for polymerization. Manufactured polycarbonate may be used.

In addition, the polycarbonate may have a melt index (300° C., 1.2 kg load) of 10 to 40 g/10min, more preferably 15 to 30 g/10min. In the present invention, the polycarbonate has excellent processability and moldability within the melt index range, and excellent balance of physical properties. When the melt index is less than 10 g/10 min, the fluidity is insufficient and unmolding may occur, and when it exceeds 40 g/10 min, the impact strength may tend to be slightly lowered.

In the present invention, the polycarbonate is included in an amount of 15 to 50 parts by weight, preferably 20 to 45 parts by weight, more preferably in consideration of the specific content of the polysiloxane-carbonate copolymer, polyarylate, and solid polymer flame retardant to be described later. For example, it may be included in an amount of 22 to 43 parts by weight.

(B) polysiloxane-carbonate copolymer

In the present invention, the polysiloxane-carbonate copolymer is added to polycarbonate containing a flame retardant to maintain flame retardancy while enhancing heat resistance. The polysiloxane-carbonate copolymer includes a carbonate block and a siloxane block as a block copolymer.

The carbonate block may be prepared by reacting a diphenol compound with phosgene, a halogen acid ester, a carbonic acid ester, or a combination thereof, and two or more diphenol compounds may be combined to form a repeating unit of the carbonate block.

Specific examples of the diphenol compound include hydroquinone, resorcinol, 4,4'-dihydroxydiphenyl, 2,2-bis(4-hydroxyphenyl)propane (also referred to as 'bisphenol-A'), 2 ,4-bis(4-hydroxyphenyl)-2-methylbutane, bis(4-hydroxyphenyl)methane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 2,2-bis(3- Chloro-4-hydroxyphenyl) propane, 2,2-bis (3,5-dimethyl-4-hydroxyphenyl) propane, 2,2-bis (3,5-dichloro-4-hydroxyphenyl) propane, 2,2-bis(3,5-dibromo-4-hydroxyphenyl)propane, bis(4-hydroxyphenyl)sulfoxide, bis(4-hydroxyphenyl)ketone, bis(4-hydroxyphenyl) ) ether, etc., preferably 2,2-bis(4-hydroxyphenyl)propane, 2,2-bis(3,5-dichloro-4-hydroxyphenyl)propane or 1,1-bis (4-hydroxyphenyl)cyclohexane may be used.

In addition, the siloxane block may include a siloxane repeating unit represented by Formula 1 below.

[Formula 1]

In Formula 1, R ₁ and R ₂ are each independently hydrogen, a substituted or unsubstituted C 1 to C 20 alkyl group or C 6 to C 20 aryl group, and a is an integer from 2 to 10,000.

In the present invention, the composition of the polysiloxane-carbonate copolymer may include 1 to 99% by weight of the carbonate repeating unit and 1 to 99% by weight of the siloxane repeating unit, but preferably 50 to 99% by weight of the carbonate repeating unit 99% by weight and 1 to 50% by weight of the siloxane repeating unit, more preferably 70 to 98% by weight of the carbonate repeating unit and 2 to 30% by weight of the siloxane repeating unit, even more preferably the carbonate The repeating unit may be included in an amount of 75 to 97 wt% and the siloxane repeating unit in an amount of 3 to 25 wt%. The polysiloxane-carbonate copolymer can implement excellent heat resistance of the final resin composition by being composed of the above composition, and the higher the siloxane block content, the greater the effect on the flame retardant synergistic effect. % of the copolymer is preferred.

In the present invention, the content of the polysiloxane-carbonate copolymer is 12 to 40 parts by weight, preferably 15 to 35 parts by weight, more preferably 17 to 33 parts by weight. In the case of the flame-retardant polycarbonate alloy resin composition in which the polysiloxane-carbonate copolymer is contained within the above content range, fluidity, impact resistance and processability are improved along with excellent flame retardancy maintenance and heat resistance improvement. Here, in relation to the polycarbonate content, it is more preferable to include the polycarbonate and the polysiloxane-carbonate copolymer in a weight ratio of 1:1.7 to 3:1.

(C) polyarylate

In the present invention, the polyarylate is an aromatic polyester resin composed of an aromatic dicarboxylic acid residue unit and a bisphenol residue unit.

Preparation of the polyarylate is not particularly limited, and known methods such as interfacial polymerization and melt polymerization may be used.

Precursors for introducing the aromatic dicarboxylic acid residue include, for example, terephthalic acid and isophthalic acid. In the present invention, a polyarylate resin composition obtained by mixing and using both is preferable in terms of melt processability and mechanical properties. The mixing ratio of terephthalic acid and isophthalic acid can be arbitrarily selected, but the mole fraction is preferably in the range of 90:10 to 10:90, and more preferably 70:30 to 30:70. When the mole fraction of terephthalic acid is out of the above range, it may be difficult to obtain a sufficient degree of polymerization during polymerization by the interfacial polymerization method.

The precursor for introducing the bisphenol moiety is, for example, 2,2-bis(4-hydroxyphenyl)propane, 2.2-bis(4-hydroxy-3,5-dimethylphenyl)propane, 2,2-bis(4) -Hydroxy-3,5-dibromophenyl)propane, 2,2-bis(4-hydroxy-3,5-dichlorophenyl)propane, 4,4'-dihydroxydiphenylsulfone, 4,4 '-dihydroxydiphenyl ether, 4,4'-dihydroxydiphenyl sulfide, 4,4'-dihydroxydiphenyl ketone, 4,4'-dihydroxydiphenylmethane, 1,1- Bis(4-hydroxyphenyl)cyclohexane etc. are mentioned, The said compound can be used individually or in mixture of 2 or more types.

In the present invention, the content of the polyarylate may be 5 to 25 parts by weight, preferably 7 to 23 parts by weight, more preferably 8 to 22 parts by weight. When the polyarylate content is less than 5 parts by weight, it is difficult to sufficiently reinforce heat resistance, and when it exceeds 25 parts by weight, fluidity and flame retardancy are deteriorated.

On the other hand, in the present invention, when a low molecular weight type polyarylate is mixed as the polyarylate, it should be added in an amount of at least 50 parts by weight in order to maintain a heat resistance property (HDT) of 125°C, preferably 130°C or higher, which It becomes a factor impairing flame retardancy and fluidity except for heat resistance. Accordingly, the polyarylate may have a weight average molecular weight (Mw) of 27,000 to 36,000 g/mol, preferably 32,000 to 34,000 g/mol.

(D) solid polymer flame retardant

In the present invention, as a flame retardant of a specific composition in polycarbonate, the existing liquid flame retardant is excluded and a solid polymer flame retardant is included to provide flame retardancy while preventing a decrease in heat resistance and impact strength. When a phosphorus-based flame retardant in the existing liquid form is used, most of the physical properties such as heat resistance, impact strength, and mechanical properties are lowered, except for flame retardancy, compared to the case of using a solid polymer flame retardant.

The solid polymer flame retardant is a phosphorus-based flame retardant, and polyphosphonate including a repeating unit represented by Formula 2 may be used.

[Formula 2]

In Formula 2, X is an alkylene group having 1 to 10 carbon atoms, n is an integer of 6 to 20, and m is an integer of 1 to 20.

Specifically, the phosphorus-based flame retardant may have a weight average molecular weight (Mw) of 1,000 to 100,000 g/mol, preferably 10,000 to 50,000 g/mol. When the weight average molecular weight of the phosphorus-based flame retardant is less than 1,000 g/mol, flame retardancy and mechanical properties of the resin composition may be reduced, and if it exceeds 100,000 g/mol, fluidity and processability of the resin composition may be reduced.

In the present invention, the phosphorus-based flame retardant preferably has a glass transition temperature (Tg) of 80 to 130°C, more preferably 90 to 110°C. In the glass transition temperature range of the above range, the resin composition has excellent flame retardancy and transparency, and color (yellowing index) characteristics may be improved.

The content of the solid polymer flame retardant in the present invention is 1 to 15 parts by weight, preferably 2 to 12 parts by weight, more preferably 5 to 12 parts by weight may be included. When the content of the solid polymer flame retardant is less than 1 part by weight, it is difficult to implement sufficient flame retardant performance, and when it exceeds 15 parts by weight, heat resistance and mechanical properties are deteriorated.

In the present invention, in addition to the components (A) to (D), (E) an impact modifier having a core-shell structure and (F) an inorganic filler may be further included.

The (E) core-shell structure impact modifier is intended to improve impact strength and mechanical properties in the case of polycarbonate containing an inorganic filler, and an unsaturated monomer containing an acrylic monomer is grafted onto the core structure of the rubber. By forming a hard shell, it has a core-shell structure.

As the core component, a rubbery polymer polymerized from a diene-based monomer, an acrylic monomer, a silicone-based monomer or a monomer of a combination thereof is used, and as an impact modifier of the core-shell structure, for example, a silicone-acrylic impact modifier, a butadiene-based impact modifier, or An acrylic impact modifier may be used, and a butadiene-based impact modifier may be preferably used from the viewpoint of compensating for dispersibility, surface gas generation, and lowering of impact strength due to the addition of low molecular weight materials compared to conventional impact modifiers.

The content of the impact modifier of the core-shell structure may be 1 to 10 parts by weight, preferably 2 to 8 parts by weight, more preferably 3 to 7 parts by weight. Within the above content range, a sufficient effect of improving impact strength and mechanical properties is exhibited, excellent surface quality is realized, and when the content is excessive, heat resistance, fluidity and flame retardancy may be reduced.

The (F) inorganic filler is a material serving to complement the rigidity of the final polycarbonate resin composition and reduce the shrinkage rate.

The inorganic filler is not particularly limited, but for example, glass fiber, glass sphere, mica, silicate, quartz, talc, titanium dioxide, wollastonite, etc. may be used, and preferably a silane-based compound such as epoxy silane or polyethylene. Those containing commercially available glass fibers surface-modified with an olefinic polymer compound may be used.

There is no particular limitation on the shape of the glass fibers, and all kinds of glass fibers may be used, provided that, in terms of improving the rigidity of the final resin composition, glass fibers having an average length of 2 to 5 mm and an average diameter of 5 to 20 μm It can be used preferably.

In the present invention, the inorganic filler may be included in an amount of 5 to 25 parts by weight, preferably 7 to 23 parts by weight, more preferably 10 to 20 parts by weight. When the content of the inorganic filler is less than 5 parts by weight, the required rigidity does not appear, and when it exceeds 25 parts by weight, the dispersibility of the inorganic filler is lowered and a lot of space is generated, so the surface protrusion of the inorganic filler is rather severe and the desired impact resistance is obtained. It is difficult.

The flame-retardant polycarbonate alloy resin composition according to the present invention may further include a functional additive suitable for the intended use or effect, in addition to the above-mentioned main components. For example, a release agent, an anti-drip agent, an antioxidant, a colorant, etc. may be additionally added in an amount of 0.1 to 2 parts by weight based on 100 parts by weight of the resin composition to be applied for various purposes.

The preparation of the flame-retardant polycarbonate alloy resin composition according to the present invention is not particularly limited, and a method commonly used for preparing a mixed resin composition and the like may be used. For example, the above-mentioned (A) to (D) components, or (A) to (F) components are quantified and mixed and then extruded using an extruder to prepare a polycarbonate and copolyester alloy resin composition. have.

The flame-retardant polycarbonate alloy resin composition according to the present invention is suitable for application to large-sized injection molding products or parts requiring high heat resistance by preventing a decrease in fluidity, heat resistance and impact strength while imparting flame retardancy. Specifically, the flame-retardant polycarbonate alloy resin composition has a melt index (MI) (250° C., 2.16 kg load) of 15 to 50 g/10min, preferably 17 to 30 g/10min, and a heat deflection temperature (HDT) (ASTM D648, 18.5 kg load, 6.4 mm thickness) is 125 ℃ or more, preferably 130 ℃ or more, flame retardancy (UL94V, 1.5 mm thickness basis) is V-0, IZOD impact strength (ASTM D256, 1 /8” thickness) is 6 kgf·cm/cm or more, preferably 7 kgf·cm/cm or more.

Hereinafter, specific examples and comparative examples according to the present invention will be described.

First, the specifications of the components used in Examples and Comparative Examples of the present invention are as follows.

(A) Polycarbonate (PC)

Bisphenol A-type polycarbonate (PC-1220S, Lotte Chemical) having a melt index (300°C, 1.2 kgf) of 20 g/10 min and a weight average molecular weight (measured by gel permeation chromatography (GPC)) of 22,000 to 23,000 g/mol g) was used.

(B) polysiloxane-carbonate copolymer

A polysiloxane-carbonate copolymer (LEXAN EXL-1434T, SABIC) containing 20 to 25 wt% of siloxane repeating units was used.

(C) polyarylate

A high molecular weight type polyarylate (PAR-SK, UNITIKA) having a weight average molecular weight (Mw) of 33,000 g/mol was used.

(D) solid polymer flame retardant

(D-1) Polyphosphonate (HM-1100, FRX) having a weight average molecular weight (measured by gel permeation chromatography (GPC)) of 15,000 g/mol and a glass transition temperature (Tg) of 100°C as a solid polymer type phosphorus flame retardant polymers) and (D-2) bisphenol A diphosphate (CR-741, Daihachi Corporation) having a weight average molecular weight of 5,000 to 7,000 g/mol as a liquid, single-molecular-weight phosphorus-based flame retardant were used.

(E) Impact modifier of core-shell structure

MBS (Methylmethacrylate-butadiene-styrene) impact modifier (EXL-2609, Dow Chemical), which is a butadiene-based impact modifier, was used.

(F) inorganic fillers

Glass fiber (CS-321, KCC) having an average length of 3 mm and an average diameter of 13 μm was used.

(G) other additives

As additives commonly used in flame-retardant polycarbonate resins, release agents (LOXIOL P861, EMERY), phenolic antioxidants (ADK STAB AO-50, ADEKA), phosphorus-based antioxidants (Songnox® 1680, Songwon Industries) and dripping inhibitors (FS -200, Hannano Tech) was used in the same ratio.

Examples and Comparative Examples

The thermoplastic resin composition is chipped using a twin-screw extruder (the temperature of each barrel is heated from 200 ° C to 265 ° C for each section from the hopper to the die, and the temperature of the final die is processed to 270 ° C) with the component composition of Table 1 below. After drying at 80° C. for 4 hours using a hot air dryer, each specimen was injection-molded using a mold for specimen production.

test example

The physical properties of the prepared specimens were measured according to the following method, and the results are shown in Table 1 below.

[How to measure]

(1) Tensile strength

According to ASTM D638 (Type IV standard), it was measured under 50 mm/min condition using a universal testing machine.

(2) Flexural strength and flexural modulus

It was measured under 10 mm/min condition according to ASTM D790.

(3) Impact strength

IZOD impact strength (thickness 1/8”) was measured according to ASTM D256.

(4) Heat Deflection Temperature (HDT)

Measured according to ASTM D648.

(5) melt index

Measurements were made at 250° C. under a load of 2.16 kg according to ASTM D1238.

(6) Measurement of flame retardancy

The flame retardancy was measured at a thickness of 1.5 mm in accordance with UL94V flame retardant regulations.

Referring to Table 1, when the solid polymer flame retardant and the core-shell structure impact modifier are added while alloying the polysiloxane-carbonate copolymer and polyarylate of a specific composition to the polycarbonate according to the present invention (Example 1) to 7) It can be confirmed that heat resistance is generally improved while maintaining excellent flame retardancy, and excellent fluidity, impact strength and mechanical properties are realized. However, when the content of the solid polymer flame retardant is relatively small (Example 5), the flame retardancy is slightly lowered, and when the content is relatively high (Example 6), the impact strength and heat resistance are slightly lowered, and the inorganic filler content is relatively When there are many (Example 7), the impact strength is somewhat lowered, so it is advantageous to apply within the preferred range presented in the present invention in the composition ratio of the components.

On the other hand, when polycarbonate is included in excess and the polysiloxane-carbonate copolymer content does not fall within the range predetermined in the present invention (Comparative Examples 1 and 2), heat resistance is reduced, flame retardancy is insufficient or mechanical properties are reduced, and polysiloxane- When the carbonate copolymer content exceeds the range predetermined in the present invention (Comparative Example 3), it can be seen that fluidity and mechanical properties are reduced.

In addition, when polyarylate is not used (Comparative Example 4), heat resistance is significantly lowered, mechanical properties are lowered, and when polyarylate is used in excess without using polycarbonate (Comparative Examples 5 and 7), flame retardancy, It can be seen that both fluidity and mechanical properties are reduced.

In addition, it can be seen that heat resistance, impact strength, and mechanical properties are all lowered when a liquid form of the phosphorus-based flame retardant is prescribed instead of a solid polymer form (Comparative Example 6).

The preferred embodiment of the present invention has been described in detail above. The description of the present invention is for illustration, and those of ordinary skill in the art to which the present invention pertains will understand that other specific forms can be easily modified without changing the technical spirit or essential features of the present invention.

Therefore, the scope of the present invention is indicated by the claims to be described later rather than the above detailed description, and all changes or modifications derived from the meaning, scope, and equivalent concept of the claims are included in the scope of the present invention. should be interpreted

Claims (6)

A flame retardant polycarbonate alloy resin composition comprising 15 to 50 parts by weight of polycarbonate, 12 to 40 parts by weight of polysiloxane-carbonate copolymer, 5 to 25 parts by weight of polyarylate, and 1 to 15 parts by weight of a solid polymer flame retardant. According to claim 1,
The polycarbonate and the polysiloxane-carbonate copolymer are flame-retardant polycarbonate alloy resin composition, characterized in that included in a weight ratio of 1:1.7 to 3:1. According to claim 1,
The polysiloxane-carbonate copolymer is a flame-retardant polycarbonate alloy resin composition comprising 1 to 50 wt% of a siloxane repeating unit represented by the following formula (1):
[Formula 1]

In Formula 1, R ₁ and R ₂ are each independently hydrogen, a substituted or unsubstituted C 1 to C 20 alkyl group or C 6 to C 20 aryl group, and a is an integer from 2 to 10,000. According to claim 1,
The solid polymer flame retardant flame-retardant polycarbonate alloy resin composition comprising a repeating unit represented by the following formula (2):
[Formula 2]

In Formula 2, X is an alkylene group having 1 to 10 carbon atoms, n is an integer of 6 to 20, and m is an integer of 1 to 20. 5. The method of claim 4,
The solid polymer flame retardant has a weight average molecular weight (Mw) of 1,000 to 100,000 g / mol, and a glass transition temperature (Tg) of 80 to 130 ℃ flame-retardant polycarbonate alloy resin composition, characterized in that. According to claim 1,
The resin composition is a flame-retardant polycarbonate alloy resin composition, characterized in that it further comprises 1 to 10% by weight of an impact modifier having a core-shell structure and 5 to 25% by weight of an inorganic filler.