KR102646946B1 - Glass fiber reinforced polycarbonate resin composition having enhanced mechanical strength and chemical resistance - Google Patents

Abstract

A polycarbonate resin composition having excellent chemical resistance and mechanical strength at the same time is disclosed. The present invention relates to 40 to 90% by weight of polycarbonate; 5 to 30% by weight of glass fiber; 0.5 to 10% by weight of a rubber-modified vinyl-based graft copolymer with a core/shell structure; 0.5 to 10% by weight of syndiotactic polystyrene resin; and 0.1 to 10% by weight of polycarbonate and glycidyl methacrylate-acrylonitrile-styrene copolymer. It provides a glass fiber reinforced polycarbonate resin composition comprising.

Description

Glass fiber reinforced polycarbonate resin composition having enhanced mechanical strength and chemical resistance}

The present invention relates to a polycarbonate resin composition, and more specifically, to a glass fiber reinforced polycarbonate resin composition with excellent mechanical strength and chemical resistance.

Polycarbonate is widely used as an engineering plastic because it has excellent flame retardancy, heat resistance, impact resistance, and electrical insulation. However, when used as a replacement for metal materials in machine parts, etc., there are problems such as lower rigidity compared to metal and creep phenomenon.

To solve this problem, a method of reinforcing glass fiber is used, but when glass fiber is mixed into polycarbonate, the impact resistance is significantly reduced and the molded product is easily broken, or the glass fiber protrudes on the surface, causing damage after coating or plating. Another problem arises in the process where the defect rate increases.

There is a method of using a core-shell structured impact modifier to improve the impact strength of glass fiber-reinforced polycarbonate, but the effect is focused only on increasing the impact strength, causing excessive shear during processing. It was difficult to solve the problems of fiber destruction and resin deterioration.

Moreover, recently, the molded parts of small electrical and electronic products have become thinner and more complex, and the painting process has been strengthened for a more beautiful appearance. Accordingly, when applying the glass fiber reinforced polycarbonate resin composition described above, there is a problem in that the mechanical properties of the polycarbonate resin are greatly reduced due to the diluted solvent exposed during the painting process. Due to these problems, the use of polycarbonate resin in applications that undergo processes exposed to chemicals, such as painting processes, is restricted, and research has been continuously conducted to improve this.

Korean Patent No. 1812892 is a glass fiber reinforcement containing polycarbonate and glass fiber, a rubber-modified vinyl graft copolymer with a core/shell structure, polycarbonate, and glycidyl methacrylate-acrylonitrile-styrene copolymer. As a polycarbonate resin composition, it improves impact resistance and the surface quality of injection molded products after molding, but is not aware of the problem of reduced chemical resistance due to the use of impact modifiers in the core/shell structure.

Korean Patent No. 0711945 is a polycarbonate resin composition containing polycarbonate, syndiotactic styrene polymer, core-shell graft copolymer, and phosphoric acid ester compound, and has excellent chemical resistance, fluidity, and good impact resistance. , it is not sufficient in terms of mechanical bending strength.

Korean Patent No. 1511535 is a polycarbonate resin composition containing polycarbonate, silicone polycarbonate, and syndiotactic styrene polymer, and has excellent impact strength, impact resistance, and low-temperature impact resistance, but lacks chemical resistance or mechanical bending strength. There is no mention of improvement.

Korean Patent No. 1311937 is a polycarbonate resin composition containing polycarbonate, a syndiotactic styrene polymer, a core-shell graft copolymer, and an acrylic copolymer, and has excellent fatigue resistance and weld strength, but is also resistant to fatigue resistance. There is no mention of chemical properties or improvements in mechanical flexural strength.

Japanese Patent Publication No. 2000-086844 is a polycarbonate resin composition containing polycarbonate, syndiotactic styrene resin, rubber graft copolymer, and flame retardant, and has excellent impact strength and flame retardancy, but is also poor in chemical resistance or mechanical resistance. There is no mention of improvement in flexural strength.

The present invention seeks to provide a polycarbonate resin composition that has excellent chemical resistance and at the same time excellent mechanical strength.

In order to solve the above problem, the present invention includes 40 to 90% by weight of polycarbonate; 5 to 30% by weight of glass fiber; 0.5 to 10% by weight of a rubber-modified vinyl-based graft copolymer with a core/shell structure; 0.5 to 10% by weight of syndiotactic polystyrene resin; and 0.1 to 10% by weight of polycarbonate and glycidyl methacrylate-acrylonitrile-styrene copolymer. It provides a glass fiber reinforced polycarbonate resin composition comprising.

In addition, the polycarbonate provides a glass fiber reinforced polycarbonate resin composition, characterized in that the weight average molecular weight is 10,000 to 200,000.

In addition, the rubber-modified vinyl graft copolymer of the core/shell structure is a composite rubber containing 5 to 95% by weight of a polyorganosiloxane rubber component and 5 to 95% by weight of a polyalkyl (meth)acrylate rubber component, A glass fiber reinforced polycarbonate resin composition is provided, which is obtained by graft polymerization of single or two or more types of vinyl monomers.

In addition, the composite rubber provides a glass fiber reinforced polycarbonate resin composition, characterized in that it contains 65 to 95% by weight of a polyorganosiloxane rubber component and 5 to 35% by weight of a polyalkyl (meth)acrylate rubber component.

In addition, the syndiotactic polystyrene-based resin provides a glass fiber reinforced polycarbonate resin composition, characterized in that the syndiotactic degree is 97% or more.

In addition, the syndiotactic polystyrene-based resin provides a glass fiber reinforced polycarbonate resin composition, wherein the syndiotactic polystyrene resin is polystyrene.

In addition, the polycarbonate and glycidyl methacrylate-acrylonitrile-styrene copolymer are characterized in that the polycarbonate content is 50 to 70% by weight and the glycidyl methacrylate content is 30 to 50% by weight. A glass fiber reinforced polycarbonate resin composition is provided.

According to the present invention, the glass fiber reinforced polycarbonate includes a core/shell structured rubber-modified vinyl-based graft copolymer; Syndiotactic polystyrene resin; By combining polycarbonate and glycidyl methacrylate-acrylonitrile-styrene copolymer, a glass fiber reinforced polycarbonate resin composition with dramatically improved mechanical strength and chemical resistance can be provided.

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 related known technologies may obscure the gist of the present invention, the detailed description will be omitted. Throughout the specification, when a part is said to “include” a certain element, this means that it may further include other elements rather than excluding other elements, unless specifically stated to the contrary.

The present inventors faced the situation in which conventional modifications of polycarbonate reinforced with glass fiber mainly limited to improving impact resistance and did not suggest an effective method for simultaneously improving mechanical strength and chemical resistance other than impact resistance, and conducted repeated research. As a result, it was found that the mechanical strength and chemical resistance of the glass fiber reinforced polycarbonate resin composition were dramatically improved when syndiotactic polystyrene resin for improving mechanical strength and chemical resistance was combined with a specific impact modifier and compatibilizer in a certain composition. This discovery led to the present invention.

Accordingly, the present invention includes 40 to 90% by weight of polycarbonate; 5 to 30% by weight of glass fiber; 0.5 to 10% by weight of a rubber-modified vinyl-based graft copolymer with a core/shell structure; 0.5 to 10% by weight of syndiotactic polystyrene resin; and 0.1 to 10% by weight of polycarbonate and glycidyl methacrylate-acrylonitrile-styrene copolymer. Disclosed is a glass fiber-reinforced polycarbonate resin composition comprising.

Hereinafter, each component of the polycarbonate resin composition according to an embodiment of the present invention will be described in detail.

(A) Polycarbonate resin

The polycarbonate (PC) resin used in the present invention has excellent impact resistance, heat resistance, weather resistance, self-extinguishing, flexibility, processability, and transparency, and has excellent weather resistance, maintaining high physical properties for a long period of time, and has excellent heat resistance and cold resistance under extreme temperatures. Maintains performance despite changes. In the present invention, in particular, in order to balance the physical properties of the final polycarbonate resin composition, such as impact resistance, mechanical strength, chemical resistance and processability, it is included in an amount of 40 to 90% by weight, preferably 60 to 80% by weight, more preferably 65% by weight. It may be included in an amount of from 75% by weight.

Additionally, the polycarbonate resin according to an embodiment of the present invention may have a weight average molecular weight of 10,000 to 200,000, preferably 15,000 to 80,000. In addition, branched chain ones may be used, and preferably 0.05 to 2 mol% of a tri- or higher polyfunctional compound, for example, a compound having a trivalent or higher phenol group, is added relative to the total amount of diphenol used in polymerization. Polycarbonate resin prepared as follows can be used.

Meanwhile, the production of the polycarbonate resin used in the present invention may follow a commonly used production method, for example, reacting dihydroxy phenol and phosgene in the presence of a molecular weight regulator and a catalyst. It can be manufactured by or using the ester exchange reaction of the precursor obtained by dihydroxy phenol and diphenyl carbonate.

In addition, the polycarbonate resin is a polymer of bisphenol-A and may have a melt index (300°C, 1.2 kgf) of 3 to 28 g/10min, preferably 5 to 15 g/10min. . If the melt index is less than 3 g/10min, the processing temperature may increase and molding may be difficult, and if it exceeds 28 g/10min, the strength may become weak.

(B) Glass fiber

In the present invention, glass fiber is added to supplement the rigidity of the polycarbonate resin composition, and maintains a very strong bond between polymers to improve mechanical properties and wear resistance. The glass fiber may have a diameter of 5 to 20 ㎛ and a length of 2 to 5 mm, and efficient rigidity is developed within the above range.

The glass fiber may be used in an amount of 5 to 30% by weight, preferably 10 to 30% by weight, and more preferably 15 to 25% by weight, based on the total resin composition. If the glass fiber content is less than 5% by weight, the required rigidity may not be achieved, and if it exceeds 30% by weight, the viscosity of the resin increases, making molding difficult.

(C) Rubber-modified vinyl-based graft copolymer with core/shell structure

In the present invention, a rubber-modified vinyl graft copolymer with a core/shell structure is used to improve the chemical resistance as well as the impact strength of polycarbonate filled with glass fiber.

Considering both chemical resistance and impact strength, a copolymer made by graft polymerizing single or two or more vinyl monomers to a composite rubber is used as the rubber-modified vinyl graft copolymer of the core/shell structure, and is preferred. In other words, 5 to 95% by weight of the polyorganosiloxane rubber component and 5 to 95% by weight of the polyalkyl (meth)acrylate rubber component are composed of a composite rubber having an inseparable intertwined structure, singly or two or more types of vinyl-based rubber. Monomers obtained by graft polymerization may be used. More preferably, 65 to 95% by weight of the polyorganosiloxane rubber component and 5 to 35% by weight of the polyalkyl (meth)acrylate rubber component are used alone or in a composite rubber having an inseparable intertwined structure, or two or more types of vinyl. Those obtained by graft polymerization of the monomer may be used, and from the viewpoint of improving the chemical resistance and impact strength of the resin, it is more preferable that the polyorganosiloxane rubber component among the composite rubber components is 65% by weight or more.

The rubber-modified vinyl-based graft copolymer of the core/shell structure can be prepared by free radical polymerization such as emulsion, suspension, solution, or bulk polymerization, and is preferably prepared by emulsion or bulk polymerization. For detailed manufacturing processes, please refer to, for example, Korean Patent No. 1719827 and Korean Patent No. 1500890. That is, the polyorganosiloxane rubber latex is prepared, and then the monomer for synthesis of alkyl (meth)acrylate rubber is impregnated into the rubber particles of the polyorganosiloxane rubber latex, and then the alkyl (meth)acrylate rubber is synthesized. The above composite rubber can be produced by polymerizing the monomer. The main skeleton of the polyorganosiloxane rubber component in the composite rubber includes dimethylsiloxane, diphenylsiloxane, methylphenylsiloxane, hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, and trimethyl. -Polymers having repeating units selected from triphenyl-cyclotrisiloxane, tetramethyl-tetraphenyl-cyclotetrasiloxane, and octaphenylcyclotetrasiloxane by themselves or in combinations of two or more of them can be mentioned. In addition, the main skeleton of the polyalkyl (meth)acrylate rubber component in the composite rubber includes methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, and n-butyl (meth)acrylate. Latex, t-butyl (meth)acrylate, n-hexyl (meth)acrylate, n-octyl (meth)acrylate, n-lauryl (meth)acrylate, 2-ethylhexyl (meth)acrylate, benzyl Polymers having a repeating region selected from (meth)acrylates can be mentioned.

Various vinyl monomers can be graft polymerized to the composite rubber. Various vinyl monomers are added to the latex of the composite rubber, and radical polymerization initiated by free radicals is polymerized through one-stage or multi-stage emulsion polymerization, and then metal salts such as calcium chloride are added to the obtained latex to produce rubber-modified vinyl with a core/shell structure. It is obtained by solidifying the graft copolymer. Examples of the vinyl monomer include aromatic alkenyl compounds such as styrene, α-methylstyrene, p-methylstyrene, and p-chlorostyrene, methyl methacrylate, ethyl methacrylate, 2-ethylhexyl methacrylate, and aryl methacrylate. Acrylic acid esters such as methacrylate, methyl acrylate, ethyl acrylate, n-butyl acrylate, and t-butyl acrylate, vinyl cyanide compounds such as acrylonitrile and methacrylonitrile, maleic anhydride, and N- Derivatives of unsaturated carboxylic acids, such as phenyl-maleimide, can be mentioned, and these can be used alone or in combination of two or more types.

Commercially available products can be used as rubber-modified vinyl-based graft copolymers with this core/shell structure. For example, impact modifiers with a core-shell structure such as Matablen (brand name) sold by Mitsubishi Chemical are easily available. possible.

In the resin composition of the present invention, the rubber-modified vinyl graft copolymer of the core/shell structure is used in an amount of 0.5 to 10% by weight, preferably 1 to 8% by weight, more preferably 1 to 1% by weight, based on the total resin composition. It can be used in an amount of 5% by weight. If the content of the rubber-modified vinyl-based graft copolymer in the core/shell structure is less than 0.5% by weight, the required improvement in chemical resistance and impact resistance may be minimal, and if it exceeds 10% by weight, the mechanical strength characteristics may be reduced.

(D) Syndiotactic polystyrene resin

In the present invention, the rubber-modified vinyl graft copolymer of the core/shell structure is combined with the polycarbonate and glycidyl methacrylate-acrylonitrile-styrene copolymer described later to improve the mechanical strength and chemical resistance of the final resin composition. Syndiotactic polystyrene resin is used as an ingredient to maximize improvement.

Polystyrene is classified into atactic, isotactic, and syndiotactic structures depending on the position of the phenyl group bonded to the side of the main chain. Atactic polystyrene has a structure in which phenyl groups are arranged irregularly in the main chain, while isotactic polystyrene has a structure in which phenyl groups are arranged in only one direction of the main chain. On the other hand, syndiotactic polystyrene has a structure in which phenyl groups are arranged alternately in opposite directions of the main chain. The orientation of this polystyrene structure can be quantified by nuclear magnetic resonance ( ¹³ C-NMR) using carbon isotopes.

In the present invention, syndiotactic polystyrene with high stereoregularity is used, and the syndiotactic degree is preferably 97% or more. If the syndiotactic degree is less than 97%, the chemical resistance of the final resin composition may not be satisfactory. there is.

In the present invention, the type of syndiotactic polystyrene is not particularly limited as long as it has such high stereoregularity, but examples include polystyrene.

In the resin composition of the present invention, the syndiotactic polystyrene-based resin is used in an amount of 0.5 to 10% by weight, preferably 1 to 8% by weight, more preferably 2 to 6% by weight, based on the total resin composition. there is. If the syndiotactic polystyrene resin content is less than 0.5% by weight, the required chemical resistance improvement effect may be minimal, and if it exceeds 10% by weight, mechanical strength characteristics may be reduced.

(E) Polycarbonate and glycidyl methacrylate-acrylonitrile-styrene copolymer

In the present invention, polycarbonate and glycidyl methacrylate-acrylonitrile-styrene copolymer are graft copolymers in which polycarbonate resin is the main chain and acrylonitrile-styrene copolymer modified with glycidyl methacrylate is the side chain. As a composite, it acts as a compatibilizer to improve compatibility between polycarbonate and glass fiber, a rubber-modified vinyl-based graft copolymer with a core/shell structure, and a syndiotactic polystyrene-based resin, and reduces the interfacial tension between materials to improve mechanical strength and Improves chemical resistance.

In the polycarbonate and glycidyl methacrylate-acrylonitrile-styrene copolymer, the content of polycarbonate is 50 to 70% by weight (glycidyl methacrylate-acrylonitrile-) based on 100% by weight of the copolymer. It is preferable that it is 30 to 50% by weight of styrene copolymer. If the content of the polycarbonate is outside the above range, the compatibility between polycarbonate and glass fiber, the rubber-modified vinyl graft copolymer with a core/shell structure, and the syndiotactic polystyrene resin is reduced, thereby reducing the mechanical strength and surface improvement effect. may decrease.

The polycarbonate and glycidyl methacrylate-acrylonitrile-styrene copolymer are used in an amount of 0.1 to 10% by weight, preferably 1 to 8% by weight, more preferably 1 to 5% by weight, based on the total resin composition. It can be used in % content. If the polycarbonate and glycidyl methacrylate-acrylonitrile-styrene copolymer content is less than 0.1% by weight, the effect of improving mechanical strength and chemical resistance may be minimal, and if it exceeds 10% by weight, the mechanical strength properties deteriorate. It can be.

In addition to the above-mentioned main components, the glass fiber reinforced polycarbonate resin composition according to the present invention may further include inorganic fillers and functional additives within the scope of the intended use or effect. For example, carbon fiber, talc, flame retardant, light stabilizer, lubricant, colorant, lubricant, ultraviolet stabilizer, antioxidant, coupling strengthener, heat stabilizer, plasticizer, etc. can be additionally added to apply it for various purposes.

The glass fiber reinforced polycarbonate resin composition according to the present invention can be manufactured by known methods. For example, the components (A) to (E) can be mixed with other additives simultaneously and then melted and extruded in an extruder to form pellets, and the pellets can be used to manufacture various molded products. At this time, the melt extrusion may be performed under extrusion conditions of an extrusion temperature of 250 to 320°C and a screw rotation speed of 50 to 1,000 rpm.

The glass fiber reinforced polycarbonate resin composition according to the present invention has a flexural strength (ASTM D790, 10 mm/min condition) of 1,500 kgf/cm2 or more, preferably 1,600 kgf/cm2 or more, and a flexural modulus (ASTM D790, 10 mm/min). /min condition) is 50,000 kgf/cm2 or more, preferably 52,000 kgf/cm2 or more, and IZOD impact strength (ASTM D256, 23℃, 1/8" specimen notch impact strength) is 15 kgf·cm/cm or more, preferably Typically, it is 17 kgf·cm/cm or more, and the DuPont impact strength measured according to the method below is 30 N or more, preferably 35 or more after immersion in thinner, and the reduction in DuPont impact strength before and after immersion in thinner is 30 N. , preferably 25 or less.

[measurement method]

A circular specimen (100 mm in diameter, 3 mm in thickness) made from the above resin composition was immersed in thinner (mixture of 40% by weight of xylene and 60% by weight of toluene) for 10 seconds, dried at 80°C for 30 minutes, and tested on a DuPont impact tester (load 2). The impact strength was measured before and after thinner immersion according to ASTM D2794 using the weight drop (kg).

Hereinafter, specific embodiments according to the present invention will be described.

First, (A) polycarbonate resin, (B) glass fiber, (C) core/shell structured rubber-modified vinyl graft copolymer, (D) syndiotactic polystyrene used in the examples and comparative examples of the present invention. The specifications of the system resin and (E) polycarbonate and glycidyl methacrylate-acrylonitrile-styrene copolymer are as follows.

(A) Polycarbonate resin

Bisphenol-A type polycarbonate resin (PC-1100S, Lotte Chemical) with a melt index of 10 g/10 min (300°C, 1.2 kg load) was used.

(B) Glass fiber

Glass fiber (CS321, KCC) with a fiber length of 3 mm and a filament diameter of 13 ㎛ was used.

(C) Rubber-modified vinyl-based graft copolymer with core/shell structure

A commercial product, S-2001 from Mitsubishi Chemical, Japan, was used.

(D) Syndiotactic polystyrene resin

130ZC from Idemistu, Japan, with a melting point of 270°C and a glass transition temperature of 93°C, was used.

(E) Polycarbonate and glycidyl methacrylate-acrylonitrile-styrene copolymer

A compatibilizer containing about 60 to 65% by weight of polycarbonate as the main chain and about 35 to 40% by weight of glycidyl methacrylate-acrylonitrile-styrene copolymer as a side chain (MODIPER CL430-G, NOF) ) was used.

Examples and Comparative Examples

Mix each component in the composition shown in Table 1 below, make the thermoplastic resin composition into pellets using a twin-screw extruder heated to 300°C, dry it at 120°C for 4 hours using a hot air dryer, and then use a mold for producing a specimen. The specimen was injection molded.

Test example

For each specimen prepared above, the physical properties were measured and chemical resistance was evaluated according to the method below, and the results are shown in Table 1 below.

(1) Flexural strength and flexural modulus: Measured under 10 mm/min conditions according to ASTM D790.

(2) IZOD impact strength: The notch impact strength of 1/8" specimen was measured at room temperature according to ASTM D256.

(3) DuPont impact strength: The impact strength of circular specimens (diameter 100 mm, thickness 3 mm) was measured according to ASTM D2794.

(4) Chemical resistance evaluation: The circular specimen was immersed in thinner (mixture of 40% by weight of xylene and 60% by weight of toluene) for 10 seconds, dried at 80°C for 30 minutes, and used a DuPont impact tester (2 kg weight dropped). The impact strength was measured before and after thinner immersion according to ASTM D2794.

Referring to Table 1, in the glass fiber reinforced polycarbonate, according to the present invention, a core/shell structured rubber-modified vinyl-based graft copolymer, a syndiotactic polystyrene-based resin, polycarbonate, and glycidyl methacrylate- When acrylonitrile-styrene copolymer is combined within a certain content range (Examples 1 to 8), not only does it exhibit excellent mechanical strength, but the change in DuPont impact strength before and after thinner immersion is less than 25 N, dramatically improving chemical resistance. You can confirm that this is implemented.

On the other hand, glass fiber reinforced polycarbonate (C) rubber-modified vinyl-based graft copolymer with core/shell structure, (D) syndiotactic polystyrene-based resin, and (E) polycarbonate and glycidyl methacrylate-acrylic. When the nitrile-styrene copolymer is not included (Comparative Examples 1 to 3) or two components are not included (Comparative Examples 4 to 6), the flexural properties, impact strength, and chemical resistance required by the present invention are all satisfied. This cannot be done, and even if all of the components (C) to (E) are included, if each component is included in excessive amounts (Comparative Examples 7 to 9), it can be seen that the bending properties, impact strength, and chemical resistance are reduced.

Preferred embodiments of the present invention have been described in detail above. The description of the present invention is for illustrative purposes, and those skilled in the art will understand that the present invention can be easily modified into other specific forms without changing its technical spirit or essential features.

Accordingly, the scope of the present invention is indicated by the claims described later rather than the detailed description above, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention. must be interpreted.

Claims (7)

40 to 90% by weight of polycarbonate;
5 to 30% by weight of glass fiber;
0.5 to 10% by weight of a rubber-modified vinyl-based graft copolymer with a core/shell structure;
0.5 to 10% by weight of syndiotactic polystyrene resin; and
0.1 to 10% by weight of polycarbonate and glycidyl methacrylate-acrylonitrile-styrene copolymer;
The rubber-modified vinyl graft copolymer of the core/shell structure can be used alone or in a composite rubber containing 5 to 95% by weight of a polyorganosiloxane rubber component and 5 to 95% by weight of a polyalkyl (meth)acrylate rubber component. A glass fiber-reinforced polycarbonate resin composition characterized by graft polymerization of two or more types of vinyl monomers. According to paragraph 1,
The polycarbonate is a glass fiber reinforced polycarbonate resin composition, characterized in that the weight average molecular weight is 10,000 to 200,000. delete According to paragraph 1,
The composite rubber is a glass fiber reinforced polycarbonate resin composition, characterized in that it contains 65 to 95% by weight of a polyorganosiloxane rubber component and 5 to 35% by weight of a polyalkyl (meth)acrylate rubber component. According to paragraph 1,
The syndiotactic polystyrene-based resin is a glass fiber reinforced polycarbonate resin composition, characterized in that the syndiotactic degree is 97% or more. According to clause 5,
A glass fiber reinforced polycarbonate resin composition, characterized in that the syndiotactic polystyrene-based resin is polystyrene. According to paragraph 1,
The polycarbonate and glycidyl methacrylate-acrylonitrile-styrene copolymer have a polycarbonate content of 50 to 70% by weight and a glycidyl methacrylate-acrylonitrile-styrene copolymer content of 30 to 50% by weight. A glass fiber reinforced polycarbonate resin composition characterized in that %.