JPH11241010A - Flame-retardant polycarbonate resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polycarbonate resin composition which retains flame retardancy, has a good fluidity and impact resistance and also is bromine-free. SOLUTION: The tided composition contains (A) from 95 to 70 pts.wt. aromatic polycarbonate (PC), (B) from 5 to 30 pts.wt. high-impact polystyrene resin(HIPS) containing from 2 to 30 wt.% rubbery elastic body, (C) from 2 to 15 pts.wt. halogen-free phosphoric acid ester and (D) from 1 to 5 pts.wt. core-shell type graft rubbery elastic body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polycarbonate resin composition, and more particularly, to a polycarbonate resin composition while maintaining flame retardancy.
The present invention relates to a polycarbonate resin composition having excellent properties such as impact resistance, appearance, and fluidity.

[0002]

2. Description of the Related Art Polycarbonate resins are excellent in mechanical strength (particularly, impact resistance), electrical properties, transparency and the like.
It is widely used in various fields such as electronic devices, automobiles, and construction. Among these fields of use, there are fields requiring a high degree of flame retardancy, mainly in the fields of OA equipment and electric / electronic equipment. The polycarbonate resin has a high oxygen index among various thermoplastic resins, and generally has self-extinguishing properties. However, in order to satisfy safety requirements in the field of OA equipment, electric / electronic equipment, and various other uses, there is a strong demand for a resin composition with further improved flame retardancy. In addition, there is a demand for thinner molded products, and in order to perform molding smoothly, it is necessary not only to increase the flame retardancy but also to make the resin highly fluid.

In addition, recently, a compound containing halogen, such as dioxin, which has a strong carcinogenicity, is discharged from a waste incinerator, which has a problem of adversely affecting the environment and the human body. Therefore, there is a strong demand not only for the flame retardancy of polycarbonate molded articles but also for the use of additives (non-bromo) which do not contain halogen compounds as additives for producing polycarbonate resin compositions.

[0004] There are many known methods for alloying a styrene-containing graft copolymer such as a polycarbonate resin and an acrylonitrile-butadiene-styrene resin (ABS resin) to improve the flowability of the polycarbonate resin and to make it flame-retardant. Among them, a method for further achieving non-bromo by using a halogen-free compound as a flame retardant is described in JP-A-2-32154. The styrene-containing graft copolymer such as an ABS resin used in the method described in this publication contains acrylonitrile as an essential component. Therefore, this publication does not discuss anything about polymers containing no acrylonitrile.

On the other hand, Japanese Patent Application Laid-Open No. Sho 62-4746 discloses a method of achieving non-bromo flame retardation by alloying a polystyrene and a polycarbonate resin containing no butadiene. However, since it does not contain butadiene, the impact strength is low, and there is a practical problem. In this publication, a system containing butadiene (resin composition)
Nothing has been considered.

In addition, polycarbonate (PC) and ABS
The technique of blending talc with a resin composition containing a resin is disclosed in Japanese Patent Publication No. 54-33262 and Japanese Patent Laid-Open No. 4-22765.
No. 0 discloses this. In the methods described in these publications, talc is added for the purpose of improving rigidity and improving the appearance of a matte surface, respectively, and is not intended for flame retardancy. The ABS resin contains acrylonitrile and is not a flame-retardant material.

JP-A-54-54165 discloses that MBS resin, ABS resin, BS
A method is disclosed in which a flame retardant, a flame retardant aid, and an inorganic substance such as talc are added to a resin composition to which a styrene copolymer such as rubber is added to make the composition flame retardant. The amount of butadiene in the styrene copolymer, which is a component of the composition described in this publication, is as large as 50% by weight or more, and therefore, the thermal stability is poor. In the composition described in this publication, a bromine compound such as a brominated polycarbonate oligomer is used as a flame retardant and Sb ₂ O _{3 is} used as a flame retardant auxiliary.
Etc. are used, and this cannot achieve non-bromo.

[0008]

SUMMARY OF THE INVENTION Under the above-mentioned circumstances, the present invention provides a polycarbonate resin composition which is excellent in properties such as impact resistance, appearance, fluidity and the like and which can achieve non-bromo while retaining flame retardancy. The aim is to find things.

[0009]

In order to achieve the object of the present invention, the present inventor has proposed a flame retardancy, impact resistance and other physical properties of a polycarbonate resin composition containing various polymers in various ratios. It was investigated. As a result, they have found that a polycarbonate resin composition having desired properties can be obtained by blending a specific resin with polycarbonate, and have completed the present invention.

That is, the present invention provides (A) 95 to 70 parts by weight of an aromatic polycarbonate (PC) and (B) 5 to 30 parts by weight of a high-impact polystyrene resin (HIPS) containing 2 to 30% by weight of a rubber-like elastic material. (C) 2 to 15 parts by weight of a halogen-free phosphoric acid ester and (D) 1 to 5 parts by weight of a core-shell type graft rubber-like elastic material.

Hereinafter, the present invention will be described in detail. First, the components (A) to (D) of the resin composition of the present invention will be described. (A) Polycarbonate resin (PC) As the aromatic polycarbonate (PC) which is the component (A) constituting the resin composition of the present invention, various ones can be mentioned. Preferably the general formula (I)

Embedded image [In the formula, X ¹ and X ² may be the same or different, and may be a C ₁ -C ₈ alkyl group (eg, methyl group, ethyl group, propyl group, n-butyl group, i-butyl group) Group, amyl group, i-amyl group, hexyl group, etc.). a and b represent the number of substitutions of X ¹ and X ² , respectively, and are each 0 or an integer of 1 to 4. When a and / or b is an integer of 2 to 4, a plurality of X ¹ and / or X ² may be the same or different. Y
Is a single bond; a C ₁ -C ₈ alkylene group (eg, a methylene group, an ethylene group, a propylene group, a butylene group, a pentylene group, a hexylene group, etc.), a C ₂ -C ₈ alkylidene group (eg, an ethylidene group, i -Propylidene group), C
₅ -C ₁₅ cycloalkylene group (e.g., a cyclopentylene group, a cyclohexylene group, etc.), C ₅ -C ₁₅ cycloalkylidene group (e.g., cyclopentylidene group, cyclohexylidene group, etc.); - S -, - SO _2- , -O- or -CO- bond; or formula (II-1)

Embedded image Or formula (II-2)

Embedded image The bond represented by is shown. ] It has a repeating unit of the structure represented by this.

The above polymer is usually represented by the general formula (III)

Embedded image (Wherein X ¹ , X ² , a, b and Y are as defined above), and phosgene;
It can be easily produced by reacting with a carbonate precursor such as a carbonate compound.

That is, for example, by reacting a dihydric phenol with a carbonate precursor such as phosgene in a solvent such as methylene chloride in the presence of a known acid demander or a molecular weight regulator, or by reacting a dihydric phenol with diphenyl It can be produced by a transesterification reaction with a carbonate precursor such as carbonate.

As the dihydric phenol represented by the general formula (III), various ones can be mentioned.
-Bis (4-hydroxyphenyl) propane [bisphenol A] is preferred. Examples of the dihydric phenol other than bisphenol A include bis (4-
1,1- (4-hydroxyphenyl) methane; 1,1- (4-hydroxyphenyl) ethane; 4,4′-dihydroxydiphenyl; bis (4-hydroxyphenyl) cycloalkane; bis (4 Bis (4-hydroxyphenyl) sulfide; bis (4-hydroxyphenyl) sulfone; bis (4-hydroxyphenyl) sulfoxide; bis (4-hydroxyphenyl) ether; bis (4-hydroxyphenyl) ketone And the like. In addition, examples of the dihydric phenol include hydroquinone. These dihydric phenols may be used alone or in combination of two or more.

Examples of the carbonate compound include diaryl carbonates such as diphenyl carbonate; and dialkyl carbonates such as dimethyl carbonate and diethyl carbonate. As the molecular weight regulator, usually,
Any of those used for the polymerization of carbonate may be used. Specifically, for example, phenol which is a monohydric phenol, p-cresol, p-te
Examples thereof include rt-butylphenol, p-tert-octylphenol, p-cumylphenol, and nonylphenol.

The aromatic polycarbonate which is the component (A) of the resin composition of the present invention may be a homopolymer using one of the above-mentioned dihydric phenols, or a copolymer using two or more of the above-mentioned dihydric phenols. It may be. Further, it may be a thermoplastic random branched polycarbonate resin obtained by using a polyfunctional aromatic compound in combination with the above-mentioned phenol. Further, a polycarbonate-polyorganosiloxane copolymer comprising an organosiloxane block having a number average degree of polymerization of 5 or more may be used. Further, a mixture of two or more of these various polycarbonate resins may be used.

The polycarbonate resin of the component (A) used in the present invention has a viscosity average molecular weight of 10,000 to 100,0 from the viewpoint of mechanical strength and moldability.
00, especially 15,000 to 40,000.
A value of 0 is preferred. Commercially available aromatic polycarbonates suitably used as component (A) of the resin composition of the present invention include, for example, Toughlon A2200, A150
0, A3000 and B2500 (trade name, manufactured by Idemitsu Petrochemical Co., Ltd.).

(B) Impact-resistant polystyrene resin (HIP
S) The impact-resistant polystyrene resin (HIPS) as the component (B) constituting the resin composition of the present invention is obtained by dissolving or mixing a rubber-like elastic material with a monovinyl aromatic monomer such as styrene or α-methylstyrene; It is a polymer obtained by polymerization, and needs to contain 2 to 30% by weight of a rubber-like elastic body. If the proportion of the rubber-like elastic body is less than 2% by weight, the impact resistance becomes insufficient, and if it exceeds 30% by weight, the thermal stability decreases, which is inconvenient.

Specific examples of the rubber-like elastic material include a rubber-like elastic material containing polybutadiene, acrylate and / or methacrylate, styrene-butadiene-styrene (SBS) resin, styrene-butadiene rubber (S
BR), butadiene acrylic rubber, isoprene rubber, isoprene styrene rubber, isoprene acrylic rubber, ethylene propylene rubber and the like. Among them, particularly preferred is polybutadiene. The polybutadiene used here is a low cis polybutadiene (for example, one containing 1 to 30 mol% of 1,2-vinyl bond and 30 to 42 mol% of 1,4-cis bond), and a high cis polybutadiene (for example, 1,2-vinyl bond). Those containing not more than 20 mol% of vinyl bonds and not less than 78 mol% of 1,4-cis bonds)
May be used, and a mixture thereof may be used. Commercially available high-impact polystyrene that can be suitably used as the component (B) of the resin composition of the present invention includes, for example, HT50, HT51, HT52, IT40,
IT41, IT42 (trade name, manufactured by Idemitsu Petrochemical Co., Ltd.) and the like.

(C) Non-Halogen-Containing Phosphate Ester The non-halogen-containing phosphate of component (C) constituting the resin composition of the present invention has the general formula (IV)

Embedded image (In the formula, R ₁ , R ₂ , R ₃ and R ⁴ are each independently selected from each other, and may have an optionally substituted aryl group;
X is an aralkyl group, X is an arylene group,
1, M2, M3 and M4 are each independently 0 or 1, N is 0 or an integer of 1 to 5, and when two or more phosphoric acid esters are used as a mixture, N is Is the average value of N for each of the phosphoric acid esters. ) Or a mixture of a plurality of phosphate ester monomers or oligomers.

Here, “halogen-free” of the halogen-free phosphate ester monomer of the component (C) refers to a phosphoric ester monomer even if it is a phosphoric ester monomer in order to achieve the purpose of non-bromo for environmental protection. Those containing a halogen atom are excluded from the component (C) of the resin composition of the present invention.

Specific examples of the halogen-free phosphoric acid ester monomer (C) used in the present invention include trimethyl phosphate, triethyl phosphate, tributyl phosphate, trioctyl phosphate, tributoxyethyl phosphate, triphenyl phosphate, and trichlene phosphate. Examples thereof include zyl phosphate, cresyl diphenyl phosphate, and octyl diphenyl phosphate, and preferred is triphenyl phosphate. Commercially available halogen-free phosphate monomers that can be suitably used as the component (C) of the resin composition of the present invention include TPP, TCT, TOP, PX-130, halogen-free phosphate ester oligomers, CR- 733
S (trade name, manufactured by Daihachi Chemical Co., Ltd.) and the like.

(D) Core-shell type graft rubber-like bullet
Constituting the resin composition of the sex body present invention component (D) a core-shell type graft rubbery elastomer of has a two-layer structure composed of a core (core) shell (shell), the core portion In a soft rubber state, the shell part on the surface is in a hard resin state, and the elastic body itself is in a powder state (particle state).
belongs to. Even after the rubber-like elastic body is melt-blended with a polycarbonate resin, the particle state of the rubber-like elastic body mostly maintains its original form. By keeping most of the compounded rubber-like elastic body in its original form, an effect of preventing surface layer separation can be obtained.

The core-shell type graft rubber-like elastic material which can be used as the component (D) of the present invention includes:
Various things can be mentioned. For example, those obtained by polymerizing one or more vinyl monomers in the presence of a rubbery polymer obtained from a monomer mainly composed of alkyl acrylate, alkyl methacrylate, or dimethyl siloxane can be mentioned. Can be Here, alkyl acrylates and acrylic methacrylates include C ₂ -C
Those having a ₁₀ alkyl group are preferred. In particular,
For example, ethyl acrylate, butyl acrylate, 2-
Examples include ethylhexyl acrylate and n-octyl methacrylate.

The rubber-like polymer obtained from these monomers mainly composed of alkyl acrylates includes 70% by weight or more of alkyl acrylates and another vinyl monomer copolymerizable therewith, for example, Chill methacrylate,
30% by weight of acrylonitrile, vinyl acetate, styrene, etc.
Polymers obtained by reacting the following are mentioned. In this case, a polyfunctional monomer such as divinylbenzene, ethylene dimethacrylate, triallyl cyanurate, triallyl isocyanurate or the like may be appropriately added as a crosslinking agent and reacted.

Examples of the vinyl monomer to be reacted in the presence of the rubbery polymer include aromatic vinyl compounds such as styrene and α-methylstyrene, acrylates such as methyl acrylate and ethyl acrylate, and methacrylic acid. And methacrylates such as methyl acrylate and ethyl methacrylate. These monomers may be used alone or in combination of two or more. Further, other vinyl polymers such as vinyl cyanide compounds such as acrylonitrile and methacrylonitrile, vinyl acetate, and propionic acid It may be copolymerized with a vinyl ester compound such as vinyl. This polymerization reaction can be performed by various methods such as bulk polymerization, suspension polymerization, and emulsion polymerization. Especially,
Emulsion polymerization is preferred.

The core-shell type graft rubber-like elastic material thus obtained preferably contains the rubber-like polymer in an amount of 20% by weight or more. Specific examples of such a core-shell type graft rubber-like elastic material include M-polymers such as a graft copolymer of 60 to 80% by weight of n-butyl acrylate, styrene and methyl methacrylate.
AS resin elastic body is mentioned. Commercially available MAS resin elastic bodies include, for example, Hybrene B621 (trade name, manufactured by Zeon Corporation), KM-330 (trade name, manufactured by Rohm & Haas), Metablen W529, Metablen S2001, Metablen C223, Metablen B621 (trade name) And Mitsubishi Rayon Co., Ltd.). A core-shell type graft rubber-like elastic material is disclosed in JP-A-59-93748, and the acrylate-based core-polymerized acrylate shell polymer disclosed in the same can be suitably used in the present invention.

(E) Polytetrafluoroethylene (PT
FE) Polytetrafluoroethylene (PTFE), which is an optional component constituting the resin composition of the present invention, imparts a dripping prevention effect. The average molecular weight of the polytetrafluoroethylene (PTFE) used in the present invention is preferably 500,000 or more, and particularly preferably 500,000 to 10,000,000. As the polytetrafluoroethylene that can be used in the present invention, all types currently known can be used.

When a polytetrafluoroethylene having a fibril-forming ability is used, higher flame retardancy can be imparted. There is no particular limitation on polytetrafluoroethylene (PTFE) having a fibril-forming ability, and examples thereof include those classified into Type 3 in the ASTM standard. Specific examples thereof include, for example, Teflon 6-J (trade name, manufactured by Du Pont-Mitsui Fluorochemicals), Polyflon D-1 and Polyflon F-103 (trade name, manufactured by Daikin Industries, Ltd.). Other than those classified into the above-mentioned type 3, for example, Algoflon F5 (trade name, manufactured by Montefluos), Polyflon MPA FA-100 and F20
1 (trade name, manufactured by Daikin Industries, Ltd.). These polytetrafluoroethylene (PTFE) may be used alone or in combination of two or more.

Polytetrafluoroethylene (PTFE) having a fibril-forming ability as described above can be obtained, for example, by adding tetrafluoroethylene in an aqueous solvent in the presence of sodium, potassium or ammonium peroxydisulfide under a pressure of 1 to 100 psi. At a temperature of 0 to 200 ° C, preferably 20 to 100 ° C.

Next, the mixing ratio of each component constituting the resin composition of the present invention will be described. Component (A) The resin composition of the present invention needs to contain 95 to 70 parts by weight of the aromatic polycarbonate (PC) as the component (A), and contains 90 to 75 parts by weight. Is preferred.

Component (B) The resin composition of the present invention must contain 5 to 30 parts by weight of the impact polystyrene resin (HIPS) as the component (B), and 10 to 25 parts by weight. It is preferably contained. If the amount is less than 5 parts by weight, the performance such as fluidity is insufficient, and if it exceeds 30 parts by weight, the intended flame retardant performance (1.5 mm V-0 or V-1) cannot be obtained. This is inconvenient because it greatly reduces impact strength and the like.

The rubbery elastic body in the impact-resistant polystyrene resin (HIPS) of the component (B) needs to be contained in an amount of 2 to 30% by weight. The amount of rubber-like elastic material is 2
If the amount is less than 30% by weight, improvement in impact strength cannot be obtained, and if it exceeds 30% by weight, the heat resistance is reduced and the molded article appearance such as surface layer peeling is adversely affected, which is inconvenient.

Component (C) The resin composition of the present invention needs to contain 2 to 15 parts by weight of a halogen-free phosphate ester of the component (C), and 5 to 15 parts by weight. It is preferred that If the amount is less than 2 parts by weight, the desired flame retardancy cannot be obtained, and if it exceeds 15 parts by weight, the heat resistance is greatly reduced and the impact strength is greatly reduced, which is inconvenient.

Component (D) In the resin composition of the present invention, the core-shell type graft rubber-like elastic material of the component (D) is added for further improving impact strength. 5 parts by weight, and particularly preferably 1 to 3 parts by weight. If it exceeds 5 parts by weight, rigidity and heat resistance are reduced, which is inconvenient.

[0036] Component (E) is an optional additional component of the resin composition of the present invention (E) polytetrafluoroethylene (PTFE), in order to obtain the flame retardancy of interest (UL-94, V-0 ) , A total of 1 of the above components (A), (B), (C) and (D)
Up to 2 parts by weight per 00 parts by weight,
It is preferable that 0.1 to 0.5 part by weight is blended.
Even if the amount exceeds 2.0 parts by weight, no further improvement in the effect can be expected, and the impact resistance and the appearance of the molded product are adversely affected, which is disadvantageous.

The resin composition of the present invention is used for improving the appearance, preventing static charge, improving weather resistance, improving rigidity, and the like.
In addition to the component (E), optional components can be appropriately added. Optional components that can be added to the resin composition of the present invention include, for example, an external lubricant such as an aliphatic carboxylic acid ester or paraffin, a release agent (appearance improvement), an antistatic agent, and a polyamide polyether block copolymer (permanent). Antistatic properties), benzotriazole-based and benzophenone-based ultraviolet absorbers, hindered amine-based light stabilizers (weather resistance), glass fibers (rigidity), coloring agents (others), and the like. The amount of the optional component is not particularly limited as long as the properties of the resin composition of the present invention are maintained.

Next, a method for producing the resin composition of the present invention will be described. The resin composition of the present invention is obtained by mixing and kneading the above components (A) to (E) at the above ratio, and various optional additives used as needed at an appropriate ratio. The compounding and kneading at this time
Equipment commonly used, such as ribbon blenders, Henschel mixers, Banbury mixers, drum tumblers, single screw extruders, twin screw extruders,
It can be performed by a method using a coneder, a multi-screw extruder, or the like. The heating temperature during kneading is usually 240 to 3
It is appropriately selected within the range of 00 ° C.

[0039]

The present invention will be described more specifically with reference to examples and comparative examples. Example 1 and Comparative Examples 1 to 3 Each component was blended at a ratio shown in Table 1 below and supplied to an extruder (model name: VS40, manufactured by Tanabe Plastic Machinery Co., Ltd.).
The mixture was kneaded at 260 ° C. and pelletized. In all Examples and Comparative Examples, 0.1 parts by weight of Irganox 1076 (manufactured by Ciba Geigy) and 0.1 parts by weight of ADK STAB C (manufactured by Asahi Denka Co., Ltd.) were mixed as antioxidants. The obtained pellet was dried at 80 ° C. for 12 hours, and then injection molded at a molding temperature of 260 ° C. to obtain a test piece. The performance of the obtained test piece was evaluated by various tests,
The results are shown in Table 1. The materials used and the performance evaluation methods are shown after Table 1.

[0040]

[Table 1]

In Table 1, each symbol indicates the following. (A) PC: aromatic polycarbonate, Toughlon A2
200 (trade name, manufactured by Idemitsu Petrochemical Co., Ltd., using bisphenol A as dihydric phenol, molecular weight 2200)
0) (B) HIPS: Impact-resistant polystyrene resin HIPS-1: HT52 [trade name, manufactured by Idemitsu Petrochemical Co., Ltd.
Rubber-like elastic material (polybutadiene) obtained by graft polymerization of styrene, containing 10% by weight of rubber-like elastic material, molecular weight 1
30000] HIPS-2: IT42 [trade name, manufactured by Idemitsu Petrochemical Co., Ltd.
Rubber-like elastic material (polybutadiene) grafted with styrene, containing 7% by weight of rubber-like elastic material, molecular weight 10
0000]

(C) Phosphoric acid ester: Phosphoric acid ester containing no halogen P-1: TPP (triphenyl phosphate, manufactured by Daihachi Chemical) P-2: PX-130 (trade name, manufactured by Daihachi Chemical) P -3: CR-733S (trade name, manufactured by Daihachi Chemical Co., Ltd.) (D) Rubber-like elastic body: core-shell type graft rubber-like elastic body G-1: Hybrene B621 [trade name, rubber-like elastic body manufactured by Zeon Corporation ( Polybutyl acrylate) content: 5
G-2: Metablen S2001 [trade name, manufactured by Mitsubishi Rayon Co., Ltd., rubber-like elastic body (polydimethylsiloxane) content: 50% by weight or more] (E) PTFE: polytetrafluoroethylene, F20
1L (trade name, manufactured by Daikin Chemical Industry Co., Ltd., molecular weight 4,000,000 to 5,000,000)

[Performance Evaluation Method] (1) IZOD (Izod Impact Strength) : ASTM D
According to 256, 23 ° C (1/8 inch wall thickness), unit: k
g-cm / cm Usually, 15 kg-cm / cm or more is a practically preferable range.

(2) Flexural modulus : according to ASTM D790 (test conditions, etc .: 23 ° C., 4 mm), unit: mpa This value is a measure of the rigidity of the obtained resin composition, and is usually 3000 mpa or more. Is a practically preferable range.

(3) HDT (Heat Deformation Temperature) : ASTM
D648 (load 18.6kg / cm ² , wall thickness 1 /
8 mm), unit: ° C. This value is a measure of heat resistance, and although it depends on the purpose of use of the resin composition, usually 80 ° C. or higher is a practically preferable range.

(4) SFL (spiral flow length) :
Idemitsu method (molding temperature 260 ° C, mold temperature 60 ° C, wall thickness 3m
m, width 10 mm, injection pressure 110 MPa), unit: cm This value is a measure of fluidity and is usually 50 cm.
The above is a practically preferable range.

(5) LOI (Limited Oxygen Index): ASTM
Conforms to D2863 (test conditions: 23 ° C, wall thickness 3m)
m, width 6 mm), unit:% This value is a measure of flame retardancy.

(6) 1/16 inch UL94 : UL9
4 Based on combustion test (1/16 inch) V-0 to V-1 satisfy practical flame retardancy. HB means that it has no practical flame retardancy.

As is evident from the results in Table 1, the resin composition of Example 1 which is the resin composition of the present invention satisfies the properties such as impact strength and fluidity while maintaining flame retardancy. Therefore, the heat resistance as a housing material is also sufficiently satisfied.

On the other hand, it is clear that the resin compositions of Comparative Examples 1 to 3, which are not included in the resin composition of the present invention, do not have the impact strength and other properties aimed at by the present invention.

[0051]

According to the present invention, it is difficult to mix aromatic polycarbonate (PC), high-impact polystyrene (HIPS), a halogen-free phosphoric acid ester, and a core-shell type rubber-like elastic material in a specific ratio. A polycarbonate resin composition having excellent flammability and excellent fluidity, impact resistance, and rigidity has been provided. By blending a specific amount of polytetrafluoroethylene (PTFE) in addition to the above components, more excellent flame retardancy can be achieved. Further, the flame retardant polycarbonate resin composition of the present invention,
It does not contain bromine (halogen), can achieve non-bromo, and can also solve the problem of environmental pollution.

Claims (9)

[Claims] (A) Aromatic polycarbonate (PC)
95 to 70 parts by weight, (B) 2 to 30% by weight of rubbery elastic body
Impact polystyrene resin (HIPS) containing 5 to 3
0 parts by weight, (C) halogen-free phosphate ester 2-1
A polycarbonate resin composition comprising 5 parts by weight and 1 to 5 parts by weight of (D) a core-shell type graft rubber-like elastic material. 2. The composition of claim 1, further comprising (E) 0 to 2 parts by weight of polytetrafluoroethylene (PTFE) based on 100 parts by weight of the total of (A), (B), (C) and (D). The polycarbonate resin composition according to claim 1, wherein 3. The polycarbonate resin composition according to claim 1, wherein the polycarbonate (A) has a viscosity average molecular weight of 10,000 to 100,000. 4. In a total of (A), (B), (C) and (D), (B) high impact polystyrene (HIPS) 1
The polycarbonate resin composition according to claim 1, comprising 0 to 25 parts by weight. 5. The polycarbonate resin composition according to claim 1, wherein (C) 5 to 10 parts by weight of a halogen-free phosphoric acid ester monomer is contained in the total of (A), (B), (C) and (D). Stuff. 6. The polycarbonate resin composition according to claim 1, which comprises (D) 1 to 3 parts by weight of a core-shell type graft rubber-like elastic material in the total of (A), (B), (C) and (D). Stuff. 7. The polycarbonate resin composition according to claim 1, wherein the core-shell type graft rubber-like elastic body (D) contains at least 20% by weight of the rubber-like elastic body. (E) Polytetrafluoroethylene (P)
The polycarbonate resin composition according to claim 2, wherein the average molecular weight of TFE) is 500,000 or more. (E) Polytetrafluoroethylene (P)
The polycarbonate resin composition according to claim 2, wherein TFE) has a fibril-forming ability.