JP7094734B2 - Fiber reinforced polycarbonate resin composition - Google Patents

Description

The present invention is a fiber-reinforced polycarbonate resin composition having excellent mold releasability during injection molding and excellent rigidity of the obtained molded product while maintaining the excellent heat resistance and thermal stability inherent in the polycarbonate resin. The present invention relates to a resin molded product obtained by molding a resin composition.

Polycarbonate resin is a thermoplastic resin having excellent mechanical strength, heat resistance, thermal stability, and the like, and is therefore widely used industrially in the fields of electrical and electronic fields and automobiles. Among them, polycarbonate resin reinforced with glass fiber is used for housings of electric devices and electronic devices, housings of electric tools, etc. because of its excellent strength and rigidity. In recent years, mobile terminals such as smartphones are required to be lighter because they carry their products with them. The chassis of these products and the internal chassis of electrical and electronic parts are injection-molded at high temperatures in order to achieve further thinning. Therefore, there is a demand for a molding material having excellent not only mechanical strength and rigidity but also releasability and thermal stability of a thin-walled portion.

However, the conventional glass fiber reinforced polycarbonate resin composition has not been sufficiently examined for releasability and thermal stability, and when a molded product having a thin-walled portion is remolded, the releasability is difficult or cracked. There was a problem that problems such as the above were likely to occur.

A plurality of methods are known in which an inorganic filler is contained in a polycarbonate resin in order to improve the mechanical strength and rigidity of the glass fiber reinforced polycarbonate resin composition. Patent Document 1 proposes a glass fiber reinforced polycarbonate resin composition having excellent impact resistance, rigidity and dimensional stability, which comprises a polycarbonate resin, glass fiber, trialkyl phosphite and a polyethylene wax. However, the releasability and thermal stability of this resin composition have not been investigated.

Patent Document 2 proposes a glass fiber reinforced polycarbonate composed of 50 to 240 parts by weight of a fibrous filler having an L / D ≧ 3 in a polycarbonate resin having a specific viscosity average molecular weight. Further, Patent Document 3 proposes a low anisotropic high-rigidity glass fiber reinforced resin molded product composed of a polycarbonate resin and glass fibers having a number average aspect ratio of 4 to 10. However, neither releasability nor thermal stability has been investigated in any of Patent Documents 2 and 3.

Japanese Unexamined Patent Publication No. 57-094039 Japanese Unexamined Patent Publication No. 05-287185 Japanese Unexamined Patent Publication No. 04-100830

INDUSTRIAL APPLICABILITY The present invention forms a glass fiber reinforced polycarbonate resin composition having excellent releasability and thermal stability and a resin composition thereof without impairing the excellent mechanical strength and rigidity of the glass fiber reinforced polycarbonate resin composition. It is an object of the present invention to provide a resin molded product made of polycarbonate.

As a result of diligent research to solve the above problems, the present inventor has made a polycarbonate resin contain glass fibers, a phosphite ester compound having a specific structure, a fatty acid ester, and a thermoplastic elastomer. The present invention has been completed by finding that a glass fiber reinforced polycarbonate resin composition having excellent mold releasability and thermal stability can be obtained without impairing the excellent mechanical strength and rigidity of the glass fiber reinforced polycarbonate resin composition. ..

（式中、Ｒ^２、Ｒ^３、Ｒ^５及びＲ^６は、それぞれ独立して、水素原子、炭素数１～８のアルキル基、炭素数５～８のシクロアルキル基、炭素数６～１２のアルキルシクロアルキル基、炭素数７～１２のアラルキル基又はフェニル基を示す。Ｒ^４は、水素原子又は炭素数１～８のアルキル基を示す。Ｘは、単結合、硫黄原子又は式：－ＣＨＲ^７－（ここで、Ｒ^７は、水素原子、炭素数１～８のアルキル基又は炭素数５～８のシクロアルキル基を示す。）で表される基を示す。Ａは、炭素数１～８のアルキレン基又は式：＊－ＣＯＲ８－（ここで、Ｒ^８は、単結合又は炭素数１～８のアルキレン基を示し、＊は、酸素側の結合手であることを示す）で表される基を示す。Ｙ及びＺは、いずれか一方がヒドロキシル基、炭素数１～８のアルコキシ基又は炭素数７～１２のアラルキルオキシ基を示し、もう一方が水素原子又は炭素数１ ～ ８ のアルキル基を示す。）
で表される亜リン酸エステル系化合物（Ｃ）を０．０１～０．２重量部、脂肪酸エステル（Ｄ）を０．１～２重量部、及び、熱可塑性エラストマー（Ｅ）を０．２～１０重量部含有することを特徴とする繊維強化ポリカーボネート樹脂組成物に関する。 That is, in the present invention, the following formula:

(In the formula, R ² , R ³ , R ⁵ and R ⁶ each have a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, and 6 to 12 carbon atoms, respectively. Alkylcycloalkyl group, aralkyl group or phenyl group having 7 to 12 carbon atoms. R ⁴ represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms. X is a single bond, a sulfur atom or a formula: -CHR. ^7- (Here, R ⁷ indicates a hydrogen atom, an alkyl group having 1 to 8 carbon atoms or a cycloalkyl group having 5 to 8 carbon atoms). A indicates a group having 1 to 8 carbon atoms. ⁸ alkylene group or formula: * -COR8- (where R8 indicates a single bond or an alkylene group having 1 to 8 carbon atoms, and * indicates a bond on the oxygen side). Y and Z indicate a hydroxyl group, an alkoxy group having 1 to 8 carbon atoms or an aralkyloxy group having 7 to 12 carbon atoms, and the other has a hydrogen atom or 1 to 8 carbon atoms. Indicates an alkyl group.)
0.01 to 0.2 parts by weight of the phosphite ester compound (C) represented by, 0.1 to 2 parts by weight of the fatty acid ester (D), and 0.2 parts by weight of the thermoplastic elastomer (E). The present invention relates to a fiber-reinforced polycarbonate resin composition containing up to 10 parts by weight.

The viscosity average molecular weight of the polycarbonate resin (A) is preferably 16000 to 30,000.

It is preferable that the glass fiber (B) is treated with an epoxy-based sizing agent or a urethane-based sizing agent, and the average diameter of the fiber cross section is 6 to 20 μm.

It is preferable that the glass fiber (B) has a flat cross section in which the average value of the major axis of the fiber cross section is 10 to 50 μm and the average value of the ratio of the major axis to the minor axis (major axis / minor axis) is 2 to 8.

The fatty acid ester (D) is preferably pentaerythritol tetrastearate.

The thermoplastic elastomer (E) is preferably a hydrogenated styrene-based thermoplastic elastomer or a polyester-based thermoplastic elastomer.

The present invention also relates to a resin molded product obtained by molding the fiber-reinforced polycarbonate resin composition.

The glass fiber reinforced polycarbonate resin composition of the present invention has excellent releasability and thermal stability without impairing the excellent mechanical strength and rigidity of the glass fiber reinforced polycarbonate resin composition, and therefore has an industrial utility value. Is expensive. For example, it can be used as a substitute for a metal product used for a thin-walled housing used for an electric device or an electronic device or an internal chassis, and the weight of the product can be reduced. In addition, when an external force is applied to the molded product obtained from such a resin composition, the molded product may bend and damage the electronic components housed inside the molded product. Can be suppressed.

Hereinafter, the present invention will be described in detail by showing embodiments and examples, but the present invention is not limited to the embodiments and examples shown below, and is not deviating from the gist of the present invention. It can be changed arbitrarily and implemented.

（式中、Ｒ^２、Ｒ^３、Ｒ^５及びＲ^６は、それぞれ独立して、水素原子、炭素数１～８のアルキル基、炭素数５～８のシクロアルキル基、炭素数６～１２のアルキルシクロアルキル基、炭素数７～１２のアラルキル基又はフェニル基を示す。Ｒ^４は、水素原子又は炭素数１～８のアルキル基を示す。Ｘは、単結合、硫黄原子又は式：－ＣＨＲ^７－（ここで、Ｒ^７は、水素原子、炭素数１～８のアルキル基又は炭素数５～８のシクロアルキル基を示す。）で表される基を示す。Ａは、炭素数１～８のアルキレン基又は式：＊－ＣＯＲ８－（ここで、Ｒ^８は、単結合又は炭素数１～８のアルキレン基を示し、＊は、酸素側の結合手であることを示す）で表される基を示す。Ｙ及びＺは、いずれか一方がヒドロキシル基、炭素数１～８のアルコキシ基又は炭素数７～１２のアラルキルオキシ基を示し、もう一方が水素原子又は炭素数１ ～ ８ のアルキル基を示す。）
で表される亜リン酸エステル系化合物（Ｃ）を０．０１～０．２重量部、脂肪酸エステル（Ｄ）を０．１～２重量部、及び、熱可塑性エラストマー（Ｅ）を０．２～１０重量部含有することを特徴とする。 The fiber-reinforced polycarbonate resin composition of the present invention has the following formula with respect to 100 parts by weight of the resin composition composed of 40 to 80% by weight of the polycarbonate resin (A) and 20 to 60% by weight of the glass fiber (B).

(In the formula, R ² , R ³ , R ⁵ and R ⁶ each have a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, and 6 to 12 carbon atoms, respectively. Alkylcycloalkyl group, aralkyl group or phenyl group having 7 to 12 carbon atoms. R ⁴ represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms. X is a single bond, a sulfur atom or a formula: -CHR. ^7- (Here, R ⁷ indicates a hydrogen atom, an alkyl group having 1 to 8 carbon atoms or a cycloalkyl group having 5 to 8 carbon atoms). A indicates a group having 1 to 8 carbon atoms. ⁸ alkylene group or formula: * -COR8- (where R8 indicates a single bond or an alkylene group having 1 to 8 carbon atoms, and * indicates a bond on the oxygen side). Y and Z indicate a hydroxyl group, an alkoxy group having 1 to 8 carbon atoms or an aralkyloxy group having 7 to 12 carbon atoms, and the other has a hydrogen atom or 1 to 8 carbon atoms. Indicates an alkyl group.)
0.01 to 0.2 parts by weight of the phosphite ester compound (C) represented by, 0.1 to 2 parts by weight of the fatty acid ester (D), and 0.2 parts of the thermoplastic elastomer (E). It is characterized by containing up to 10 parts by weight.

The polycarbonate resin (A) used in the present invention is obtained by a phosgen method in which various dihydroxydiaryl compounds are reacted with phosgen, or an ester exchange method in which a dihydroxydiaryl compound is reacted with a carbonic acid ester such as diphenyl carbonate. It is a polymer, and a typical example thereof is a polycarbonate resin produced from 2,2-bis (4-hydroxyphenyl) propane (commonly known as bisphenol A).

Examples of the dihydroxydiaryl compound include bis (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, 2,2-bis (4-hydroxyphenyl) butane, and 2, in addition to bisphenol A. 2-Bis (4-hydroxyphenyl) octane, bis (4-hydroxyphenyl) phenylmethane, 2,2-bis (4-hydroxyphenyl-3-methylphenyl) propane, 1,1-bis (4-hydroxy-3) -Third butylphenyl) propane, 2,2-bis (4-hydroxy-3-bromophenyl) propane, 2,2-bis (4-hydroxy-3,5-dibromophenyl) propane, 2,2-bis ( Bis (hydroxyaryl) alkanes such as 4-hydroxy-3,5-dichlorophenyl) propane, 1,1-bis (4-hydroxyphenyl) cyclopentane, 1,1-bis (4-hydroxyphenyl) cyclohexane. Bis (hydroxyaryl) cycloalkans, dihydroxydiaryl ethers such as 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxy-3,3'-dimethyldiphenyl ether, such as 4,4'-dihydroxydiphenylsulfide. Dihydroxydiarylsulfides, dihydroxydiarylsulfoxides such as 4,4'-dihydroxydiphenylsulfoxide, 4,4'-dihydroxy-3,3'-dimethyldiphenylsulfoxide, 4,4'-dihydroxydiphenylsulfon, 4,4 Examples thereof include dihydroxydiarylsulfones such as ′ -dihydroxy-3,3′-dimethyldiphenylsulfone.

These are used alone or in combination of two or more, but in addition to these, piperazine, dipiperidylhydroquinone, resorcin, 4,4'-dihydroxydiphenyl and the like may be mixed and used.

Further, the above dihydroxyaryl compound and a phenol compound having a valence of 3 or more as shown below may be mixed and used. Examples of phenols having a trivalent or higher value include fluoroglucolcin, 4,6-dimethyl-2,4,6-tri- (4-hydroxyphenyl) -heptene, and 2,4,6-dimethyl-2,4,6-tri- (4). -Hydroxyphenyl) -heptane, 1,3,5-tri- (4-hydroxyphenyl) -benzol, 1,1,1-tri- (4-hydroxyphenyl) -ethane and 2,2-bis- [4, 4- (4,4'-dihydroxydiphenyl) -cyclohexyl] -propane and the like can be mentioned.

The viscosity average molecular weight of the polycarbonate resin (A) is not particularly limited, but is usually 10,000 to 100,000, more preferably 16,000 to 30,000, and further preferably 19000 to 26,000 in terms of moldability and strength. Further, in producing such a polycarbonate resin, a molecular weight adjusting agent, a catalyst and the like can be used as needed.

The blending amount of the polycarbonate resin (A) is 40 to 80% by weight in 100% by weight of the polycarbonate resin (A) and the glass fiber (B). If it exceeds 80% by weight, the rigidity is inferior, and if it is less than 40% by weight, a molded product having inferior thermal stability is generated.

The glass fiber (B) used in the present invention is not particularly limited, and is a circular cross-section glass fiber having an average value of the ratio (major diameter / minor diameter) of the major axis to the minor axis of the fiber section of 1 to 1.5 and having a substantially circular cross section. However, it may be a flat cross-section glass fiber having an average value of the ratio of the major axis to the minor axis (major axis / minor axis) of 2 to 8.

The number average fiber length of the glass fiber (B) is preferably 1 to 8 mm. The glass fiber is manufactured according to any conventionally known method. If the number average fiber length is 1 mm or less, the improvement of mechanical strength is not sufficient, and if the polycarbonate resin is manufactured using glass fibers exceeding 8 mm, the dispersibility of the glass fibers in the polycarbonate resin is inferior. Productivity tends to decrease due to falling off from the resin.

When the glass fiber (B) is a circular cross-section glass fiber having an average value of the ratio (major axis / minor axis) of the major axis to the minor axis of the fiber section of 1 to 1.5 and a substantially circular cross section, the diameter of the glass fiber is 6. It is preferably about 20 μm. If the diameter of the glass fiber is less than 6 μm, the mechanical strength is inferior, and if it exceeds 20 μm, the appearance tends to deteriorate. The diameter of the glass fiber is more preferably 7 to 18 μm, still more preferably 8 to 15 μm.

Commercially available circular cross-section glass fibers having an average value of the ratio (major axis / minor axis) of the major axis to the minor axis of the fiber section of 1 to 1.5 and having an almost circular cross section have a diameter of 10 μm or 13 μm. There are some, and the average length of these numbers is 2 to 6 mm. Examples of the glass fiber available on the market include CS321 and CS311 manufactured by KCC and CS03MAFT737 manufactured by Owens Corning Japan.

When the glass fiber (B) is a flat cross-section glass fiber having an average value of the ratio (major axis / minor axis) of the major axis to the minor axis of the fiber section of 2 to 8, the average value of the major axis is 10 to 50 μm, preferably 15 to. It is 40 μm, more preferably 25 to 30 μm. The average value of the ratio of the major axis to the minor axis (major axis / minor axis) is 2 to 8, preferably 2 to 7, and more preferably 2.5 to 5. These are manufactured according to any conventionally known method.

If the major axis of the flat cross-section glass fiber is less than 10 μm, it is difficult to manufacture, and if it exceeds 50 μm, the surface appearance of the molded product of the polycarbonate resin composition may be impaired. If the ratio of the major axis to the minor axis is less than 2, the dimensional stability may be inferior, and if it exceeds 8, the strength may be inferior.

Examples of commercially available flat cross-section glass fibers having an average value of the ratio of major axis to minor axis (major axis / minor axis) of 2 to 8 include CSG 3PA-820 and CSG 3PA- manufactured by Nitto Boseki Co., Ltd. 830 and the like can be mentioned.

The glass fiber (B) can be surface-treated with a silane coupling agent such as aminosilane or epoxysilane for the purpose of improving the adhesion to the polycarbonate resin. Further, when handling glass fibers, they can be bundled with a bundling material such as urethane or epoxy for the purpose of improving handleability.

The blending amount of the glass fiber (B) is 20 to 60% by weight in 100% by weight of the polycarbonate resin (A) and the glass fiber (B). If it exceeds 60% by weight, a molded product having an inferior appearance may be generated, or stable production may be difficult. Further, if it is less than 20% by weight, the strength and rigidity are inferior. A more preferable blending amount is 30 to 50% by weight, and most preferably 40 to 45% by weight.

（式中、Ｒ^２、Ｒ^３、Ｒ^５及びＲ^６は、それぞれ独立して、水素原子、炭素数１～８のアルキル基、炭素数５～８のシクロアルキル基、炭素数６～１２のアルキルシクロアルキル基、炭素数７～１２のアラルキル基又はフェニル基を示す。Ｒ^４は、水素原子又は炭素数１～８のアルキル基を示す。Ｘは、単結合、硫黄原子又は式：－ＣＨＲ^７－（ここで、Ｒ^７は、水素原子、炭素数１～８のアルキル基又は炭素数５～８のシクロアルキル基を示す。）で表される基を示す。Ａは、炭素数１～８のアルキレン基又は式：＊－ＣＯＲ８－（ここで、Ｒ^８は、単結合又は炭素数１～８のアルキレン基を示し、＊は、酸素側の結合手であることを示す）で表される基を示す。Ｙ及びＺは、いずれか一方がヒドロキシル基、炭素数１～８のアルコキシ基又は炭素数７～１２のアラルキルオキシ基を示し、もう一方が水素原子又は炭素数１ ～ ８ のアルキル基を示す。）
で表される亜リン酸エステル系化合物（Ｃ）が配合されている。該化合物（Ｃ）を配合することにより、ポリカーボネート樹脂（Ａ）が本来有する機械的強度等の特性が損なわれることがなく、熱安定性に優れたガラス繊維強化ポリカーボネート樹脂組成物が得られる。 The glass fiber reinforced polycarbonate resin composition of the present invention has the following formula:

(In the formula, R ² , R ³ , R ⁵ and R ⁶ each have a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, and 6 to 12 carbon atoms, respectively. Alkylcycloalkyl group, aralkyl group or phenyl group having 7 to 12 carbon atoms. R ⁴ represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms. X is a single bond, a sulfur atom or a formula: -CHR. ^7- (Here, R ⁷ indicates a hydrogen atom, an alkyl group having 1 to 8 carbon atoms or a cycloalkyl group having 5 to 8 carbon atoms). A indicates a group having 1 to 8 carbon atoms. ⁸ alkylene group or formula: * -COR8- (where R8 indicates a single bond or an alkylene group having 1 to 8 carbon atoms, and * indicates a bond on the oxygen side). Y and Z indicate a hydroxyl group, an alkoxy group having 1 to 8 carbon atoms or an aralkyloxy group having 7 to 12 carbon atoms, and the other has a hydrogen atom or 1 to 8 carbon atoms. Indicates an alkyl group.)
The phosphite ester compound (C) represented by is blended. By blending the compound (C), a glass fiber reinforced polycarbonate resin composition having excellent thermal stability can be obtained without impairing the mechanical strength and other characteristics inherent in the polycarbonate resin (A).

In the above general formula, R ² , R ³ , R ⁵ and R ⁶ independently have a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, and 6 to 12 carbon atoms, respectively. Alkylcycloalkyl group, aralkyl group or phenyl group having 7 to 12 carbon atoms.

Here, examples of the alkyl group having 1 to 8 carbon atoms include a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a sec-butyl group and a t-butyl group. Examples thereof include a group, a t-pentyl group, an i-octyl group, a t-octyl group, a 2-ethylhexyl group and the like. Examples of the cycloalkyl group having 5 to 8 carbon atoms include a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group and the like. Examples of the alkylcycloalkyl group having 6 to 12 carbon atoms include a 1-methylcyclopentyl group, a 1-methylcyclohexyl group, a 1-methyl-4-i-propylcyclohexyl group and the like. Examples of the aralkyl group having 7 to 12 carbon atoms include a benzyl group, an α-methylbenzyl group, an α, an α-dimethylbenzyl group and the like.

It is preferable that R ² , R ³ and R ⁵ are independently an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms or an alkyl cycloalkyl group having 6 to 12 carbon atoms. .. In particular, it is preferable that R ² and R ⁵ are independently t-alkyl groups such as t-butyl group, t-pentyl group and t-octyl group, cyclohexyl group or 1-methylcyclohexyl group, respectively. In particular, R ³ has a carbon number of methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, sec-butyl group, t-butyl group, t-pentyl group and the like. It is preferably an alkyl group of 1 to 5, more preferably a methyl group, a t-butyl group or a t-pentyl group.

The R6 is preferably a hydrogen atom, an alkyl group having ¹ to 8 carbon atoms or a cycloalkyl group having 5 to 8 carbon atoms, and is preferably a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, or an i-propyl group. , N-Butyl group, i-butyl group, sec-butyl group, t-butyl group, t-pentyl group and the like, more preferably an alkyl group having 1 to 5 carbon atoms.

In the above general formula, R ⁴ represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms. Examples of the alkyl group having 1 to ⁸ carbon atoms include the alkyl groups exemplified in the above ^- mentioned explanations of ^R2 , R3 ^, R5 and R6. In particular, ^R4 is preferably a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and more preferably a hydrogen atom or a methyl group.

In the above general formula, X represents a single bond, a sulfur atom or a group represented by the formula: -CHR ^7- . Here, R ⁷ in the formula: -CHR ^7- represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or a cycloalkyl group having 5 to 8 carbon atoms. Examples of the alkyl group having 1 to 8 carbon atoms and the cycloalkyl group having 5 to 8 carbon atoms include the alkyl group and the cycloalkyl group exemplified in the description of R ² , R ³ , R ⁵ and R ⁶ , respectively. Be done. In particular, X is a single bond, a methylene group, or a methylene group substituted with a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a t-butyl group, or the like. It is preferably present, and more preferably a single bond.

In the above general formula, A represents an alkylene group having 1 to 8 carbon atoms or a group represented by the formula: * -COR ^8- . Examples of the alkylene group having 1 to 8 carbon atoms include a methylene group, an ethylene group, a propylene group, a butylene group, a pentamethylene group, a hexamethylene group, an octamethylene group, a 2,2-dimethyl-1,3-propylene group and the like. , Which is preferably a propylene group. Further, R ⁸ in the formula: * -COR ^8- indicates a single bond or an alkylene group having 1 to 8 carbon atoms. Examples of the alkylene group having 1 to 8 carbon atoms showing R ⁸ include the alkylene group exemplified in the above description of A. ^R8 is preferably a single bond or an ethylene group. Further, * in the formula: * -COR ^8- indicates that the bond is on the oxygen side and the carbonyl group is bonded to the oxygen atom of the phosphite group.

In the above general formula, one of Y and Z represents a hydroxyl group, an alkoxy group having 1 to 8 carbon atoms or an aralkyloxy group having 7 to 12 carbon atoms, and the other has a hydrogen atom or 1 to 8 carbon atoms. Indicates an alkyl group. Examples of the alkoxy group having 1 to 8 carbon atoms include a methoxy group, an ethoxy group, a propoxy group, a t-butoxy group, a pentyloxy group and the like. Examples of the aralkyloxy group having 7 to 12 carbon atoms include a benzyloxy group, an α-methylbenzyloxy group, an α, α-dimethylbenzyloxy group and the like. Examples of the alkyl group having 1 to ⁸ carbon atoms include the alkyl groups exemplified in the above ^- mentioned explanations of ^R2 , R3 ^, R5 and R6.

Examples of the compound represented by the above general formula include 2,4,8,10-tetra-t-butyl-6- [3- (3-methyl-4-hydroxy-5-t-butylphenyl) propoxy]. Dibenzo [d, f] [1,3,2] dioxaphosphepine, 6- [3- (3,5-di-t-butyl-4-hydroxyphenyl) propoxy] -2,4,8,10 -Tetra-t-butyldibenzo [d, f] [1,3,2] dioxaphosphepine, 6- [3- (3,5-di-t-butyl-4-hydroxyphenyl) propoxy] -4 , 8-di-t-butyl-2,10-dimethyl-12H-dibenzo [d, g] [1,3,2] dioxaphosphocin, 6- [3- (3,5-di-t-butyl) -4-Hydroxyphenyl) propionyloxy] -4,8-di-t-butyl-2,10-dimethyl-12H-dibenzo [d, g] [1,3,2] dioxaphosphocin and the like can be mentioned. Among these, when the obtained polycarbonate resin composition is used in a field where optical properties are particularly required, 2,4,8,10-tetra-t-butyl-6- [3- (3-methyl-4) -Hydroxy-5-t-butylphenyl) propoxy] dibenzo [d, f] [1,3,2] dioxaphosphepine is suitable, for example, a simulator manufactured by Sumitomo Chemical Co., Ltd. and represented by the following formula. It is commercially available as GP (“Sumilyzer” is a registered trademark).

（式中、Ｒ^１は、炭素数１～２０のアルキル基を示し、ａは、０～３の整数を示す）
で表される化合物が挙げられる。 The phosphite ester compound may be used in combination with other phosphite ester compounds. The other phosphite ester compound is not particularly limited, but for example, the following general formula:

(In the formula, R ¹ represents an alkyl group having 1 to 20 carbon atoms, and a represents an integer of 0 to 3).
Examples thereof include compounds represented by.

In the above general formula, R ¹ is an alkyl group having 1 to 20 carbon atoms, and more preferably an alkyl group having 1 to 10 carbon atoms.

Examples of the compound represented by the general formula include triphenylphosphine, tricresylphosphine, tris (2,4-di-t-butylphenyl) phosphite, trisnonylphenylphosphite and the like. Among these, Tris (2,4-di-t-butylphenyl) phosphite is particularly suitable, and for example, Sumitomo Chemical Co., Ltd.'s Sumilyzer P-16 and BASF's Irgafos 168 (“Irgafos”). Is commercially available as a registered trademark of BASF Societytas Europe).

The blending amount of the phosphite ester compound (C) is 0.01 to 0.2 parts by weight with respect to 100 parts by weight of the resin composition composed of the polycarbonate resin (A) and the glass fiber (B). If the blending amount exceeds 0.2 parts by weight, the thermal stability is adversely deteriorated. Even if it is less than 0.01 parts by weight, the thermal stability is inferior. It is preferably 0.02 to 0.15 parts by weight, more preferably 0.03 to 0.12 parts by weight. The blending amount of the other phosphite ester compound is preferably 0.02 to 0.15 parts by weight, more preferably 0.02 to 0.15 parts by weight, based on 100 parts by weight of the resin composition composed of the polycarbonate resin (A) and the glass fiber (B). It is 0.03 to 0.12 parts by weight.

The glass fiber reinforced polycarbonate resin composition of the present invention contains a fatty acid ester (D). By blending the fatty acid ester (D), a glass fiber reinforced polycarbonate resin composition having excellent releasability and thermal stability can be obtained without impairing the inherent mechanical strength and other characteristics of the polycarbonate resin (A). can get.

As the fatty acid ester (D) used in the present invention, a condensed compound of an ordinary aliphatic carboxylic acid and an alcohol can be used.

Examples of the aliphatic carboxylic acid include saturated or unsaturated monocarboxylic acids, dicarboxylic acids, tricarboxylic acids and the like. The aliphatic carboxylic acid also includes an alicyclic carboxylic acid. Among these, monocarboxylic acids and dicarboxylic acids having 6 to 36 carbon atoms are preferable, and saturated monocarboxylic acids having 6 to 36 carbon atoms are more preferable.

Specific examples of the aliphatic carboxylic acid include palmitic acid, stearic acid, valeric acid, caproic acid, capric acid, lauric acid, arachidic acid, behenic acid, lignoseric acid, cellotic acid, melic acid, tetratriacontane acid, and the like. Examples thereof include montanic acid, glutaric acid, adipic acid, azelaic acid and the like.

Examples of the alcohol include saturated or unsaturated monohydric alcohols and polyhydric alcohols, and these alcohols may have substituents such as a fluorine atom, a chlorine atom, a bromine atom and an aryl group. Among these, saturated alcohols having 30 or less carbon atoms are preferable, and aliphatic saturated monohydric alcohols and aliphatic saturated polyhydric alcohols having 30 or less carbon atoms are more preferable. The aliphatic alcohol also includes an alicyclic alcohol.

Specific examples of alcohols include, for example, octanol, decanol, dodecanol, tetradecanol, stearyl alcohol, behenyl alcohol, ethylene glycol, diethylene glycol, glycerin, pentaerythritol, 2,2-dihydroxyperfluoropropanol, neopentylene glycol, and ditrimethylolpropane. , Dipentaerythritol and the like.

Specific examples of the fatty acid ester (D) include behenyl behenate, octyldodecylbehenate, stearyl stearate, glycerin monopalmitate, glycerin monostearate, glycerin monooleate, glycerin distearate, and glycerin tristea. Rate, pentaerythritol monopalmitate, pentaerythritol monostearate, pentaerythritol distearate, pentaerythritol tristearate, pentaerythritol tetrastearate, etc., which may be used alone or in combination of two or more. can. Among these, pentaerythritol stearate is preferable, and for example, Roxyol VPG861 manufactured by Cognis is commercially available.

The blending amount of the fatty acid ester (D) is 0.1 to 2 parts by weight with respect to 100 parts by weight of the resin composition composed of the polycarbonate resin (A) and the glass fiber (B). If the blending amount exceeds 2 parts by weight, stable production becomes difficult. If it is less than 0.1 parts by weight, the releasability is inferior. It is more preferably 0.3 to 1.5 parts by weight, still more preferably 0.5 to 1.0 part by weight.

It is preferable to add the thermoplastic elastomer (E) to the glass fiber reinforced polycarbonate resin composition of the present invention. By blending the thermoplastic elastomer (E), the adhesiveness between the polycarbonate resin (A) and the glass fiber (B) is improved, and the inherent mechanical strength and other characteristics of the polycarbonate resin (A) are not impaired. Further, a glass fiber reinforced polycarbonate resin composition having an excellent appearance of the molded product can be obtained.

The thermoplastic elastomer (E) is not particularly limited, and examples thereof include hydrogenated styrene-based thermoplastic elastomers and polyester-based thermoplastic elastomers.

Polystyrene-based thermoplastic elastomers are polystyrene-poly (ethylene / propylene) block copolymer, polystyrene-poly (ethylene / propylene) block-polystyrene copolymer, polystyrene-poly (ethylene / butylene) block-polystyrene co-weight. Combined, polystyrene-poly (ethylene-ethylene / propylene) block-polystyrene copolymer and the like. Further, as these hydrogenated styrene-based thermoplastic elastomers, those modified with maleic anhydride, amine, or the like can also be used. Furthermore, these can be used alone or in combination of two or more. Among these, polystyrene-poly (ethylene / butylene) block-polystyrene copolymers are suitable, and for example, Septon 8004 and 8007 manufactured by Kuraray Co., Ltd., Tough Tech H1062 and H1051 manufactured by Asahi Kasei Co., Ltd. are commercially available.

The hydrogenated styrene-based thermoplastic elastomer preferably has a styrene unit content of 55% by weight or more from the viewpoint of the appearance of the molded product. As the hydrogenated styrene-based thermoplastic elastomer having a styrene unit content of 55% by weight or more, for example, Septon 8104 manufactured by Kuraray Co., Ltd., Tough Tech H1043 manufactured by Asahi Kasei Co., Ltd. and the like are commercially available.

A polyester-based thermoplastic elastomer is a multi-block copolymer composed of a hard segment and a soft segment (one or more selected from the group consisting of an aliphatic polyether, an aliphatic polyester and a polycarbonate in a hard segment consisting of an aromatic polyester). It is a block copolymer to which soft segments are bonded). Aromatic polyester is suitable as the hard segment, and specific examples thereof include polybutylene terephthalate and polybutylene naphthalate. These can be used alone or in combination of two or more.

As the soft segment, aliphatic polyether, aliphatic polyester, polycarbonate and the like are suitable, and specific examples thereof include poly (ε-caprolactone), polytetramethylene glycol, polyalkylene carbonate and the like. These can be used alone or in combination of two or more. Examples of such a block copolymer (copolymer) include one or more copolymers selected from the group consisting of polyester-polyester copolymers, polyester-polyether copolymers, and polyester-polyester copolymers. Is preferable.

Examples of commercially available polyester-based thermoplastic elastomers include Hytrel manufactured by Toray DuPont and Perprene manufactured by Toyobo.

The blending amount of the thermoplastic elastomer (E) used in the present invention is 0.2 to 10 parts by weight with respect to 100 parts by weight of the resin composition composed of the polycarbonate resin (A) and the glass fiber (B). If the blending amount exceeds 10 parts by weight, stable production tends to be difficult. If it is less than 0.2 parts by weight, the adhesiveness between the polycarbonate resin (A) and the glass fiber (B) tends to be inferior. It is more preferably 0.3 to 8 parts by weight, still more preferably 0.4 to 6 parts by weight.

As the thermoplastic elastomer, a hydrogenated styrene-based thermoplastic elastomer and a polyester-based thermoplastic elastomer can also be used in combination. By using both in combination, a glass fiber reinforced polycarbonate resin composition having further improved adhesiveness between the polycarbonate resin (A) and the glass fiber (B) can be obtained.

In the glass fiber reinforced polycarbonate resin composition of the present invention, for example, the polycarbonate resin is supplied into the extruder barrel from the first feeder (raw material supply port), the resin is sufficiently melted, and then the glass fiber is used as the second feeder (filler). After supplying into the extruder barrel from the supply port), a generally available disc (for example, a kneading disc) is applied to the screw used for kneading, and a plurality of this disc is used as a screw configuration by a known method. It is possible by adjusting and kneading by changing the arrangement of the discs as appropriate. A pultrusion method in which a polycarbonate resin is impregnated into the fiber while drawing the glass fiber can also be used.

Further, various resins, antioxidants, fluorescent whitening agents, pigments, dyes, carbon blacks, fillers, mold release agents, and ultraviolet absorbers are added to the polycarbonate resin composition of the present invention as long as the effects of the present invention are not impaired. , Antistatic agent, rubber, softener, spreading agent (liquid paraffin, epoxidized soybean oil, etc.), flame retardant, additive such as organic metal salt, polytetrafluoroethylene resin for dripping prevention, etc. may be blended. ..

Examples of various resins include high-impact polystyrene, ABS, AES, AAS, AS, acrylic resin, polyamide, polyethylene terephthalate, polybutylene terephthalate, polyarylate, polysulfone, polyphenylene sulfide resin, and the like, and these are one or two. It may be used in combination with more than seeds.

Examples of the antioxidant include phosphorus-based antioxidants and phenol-based antioxidants. Among them, semi-hindered phenolic antioxidants and hindered phenolic antioxidants are preferably used. Examples of the semi-hindered phenolic antioxidant include Sumitomo Chemical's Sumilyzer GA-80, and examples of the hindered phenolic antioxidant include BASF's Irganox 1076, which are one or more. May be used together.

Further, the resin molded product of the present invention is characterized by being obtained by molding the fiber-reinforced polycarbonate resin composition. As the molding method of the fiber reinforced resin molded product of the present invention, an extrusion molding method or an injection molding method is used. For extrusion molding, molding such as sheet or shape extrusion using an extruder is used, and for injection molding, a mold capable of molding the molded product and an injection molding machine of 100 to 200 Т class are used. The molding processing temperature is preferably 260 to 360 ° C. Since the molded product has an excellent appearance, it can be preferably applied to a housing such as a camera or a smartphone.

Hereinafter, the present invention will be described in more detail with reference to Examples. However, the present invention is not limited to the following examples, and can be arbitrarily modified or modified as long as the gist of the present invention is not deviated. Unless otherwise specified, "%" and "parts" in the examples indicate "% by weight" and "parts by weight" based on the weight standard, respectively.

The details of the raw materials used are as follows.
1. 1. Polycarbonate resin (A)
1-1. Polycarbonate resin synthesized from bisphenol A and phosgene (manufactured by Sumika Polycarbonate Limited, SD Polyca 200-3, viscosity average molecular weight 28000, hereinafter abbreviated as "PC1")
1-2. Polycarbonate resin synthesized from bisphenol A and phosgene (manufactured by Sumika Polycarbonate Limited, SD Polycarbonate 200-13, viscosity average molecular weight 21000, hereinafter abbreviated as "PC2")
1-3. Polycarbonate resin synthesized from bisphenol A and phosgene (manufactured by Sumika Polycarbonate Limited, SD Polycarbonate 200-20, viscosity average molecular weight 19000, hereinafter abbreviated as "PC3")

2. 2. Glass fiber (B)
2-1. Flat cross-section glass fiber (CSG 3PA-820 manufactured by Nitto Boseki Co., Ltd., major axis 28 μm, minor axis 7 μm, fiber length 3 mm, urethane-based sizing agent, hereinafter abbreviated as “GF1”)
2-2. Circular cross-section glass fiber (CS321 manufactured by KCC, fiber diameter 10 μm, fiber length 3 mm, epoxy-based sizing agent, hereinafter abbreviated as “GF2”)
2-3. Circular cross-section glass fiber (CS311 manufactured by KCC, fiber diameter 10 μm, fiber length 3 mm, urethane-based sizing agent, hereinafter abbreviated as “GF3”)

3. 3. Phosphite ester compound (C)
3-1. 2,4,8,10-tetra-t-butyl-6- [3- (3-methyl-4-hydroxy-5-t-butylphenyl) propoxy] dibenzo [d, f] represented by the following formula ] [1, 3, 2] Dioxaphosfepine (Sumirazer GP manufactured by Sumitomo Chemical Co., Ltd., hereinafter abbreviated as "Compound C1")

3-2. Tris (2,4-di-t-butylphenyl) phosphite represented by the following formula (trade name, Irgafos 168 manufactured by BASF, hereinafter abbreviated as "Compound C2").

4. Fatty acid ester (D)
Pentaerythritol stearate Roxyol VPG861 (trade name, manufactured by Cognis, hereinafter abbreviated as "D1")

5. Thermoplastic elastomer (E):
5-1. Polyester-based thermoplastic elastomer (1) Polyester-polyester copolymer Perprene S-3001 (trade name, manufactured by Toyobo Co., Ltd., abbreviated as "E1")
Hard segment: Polybutylene terephthalate Soft segment: Poly (ε-caprolactone)
(2) Polyester-polyether copolymer Perprene P-150B (trade name, manufactured by Toyobo Co., Ltd., abbreviated as "E2")
Hard segment: Polybutylene terephthalate Soft segment: Polytetramethylene glycol (3) Polyester-polycarbonate copolymer Perprene C-2003 (trade name, manufactured by Toyobo Co., Ltd., abbreviated as "E3")
Hard segment: Polybutylene terephthalate Soft segment: Polyalkylene carbonate (4) Polyester-polyester copolymer Perprene EN-3000 (trade name, manufactured by Toyobo Co., Ltd., abbreviated as "E4")
Hard segment: Polybutylene naphthalate Soft segment: Polytetramethylene glycol 5-2. Hydrogenated styrene-based thermoplastic elastomer Polystyrene-poly (ethylene / butylene) block-polystyrene copolymer Septon 8104 (trade name, manufactured by Kuraray, styrene unit content 60% by weight, abbreviated as "E5")

Examples 1 to 18 and Comparative Examples 1 to 9 (preparation of pellets)
The above-mentioned various compounding components are kneaded at a melting temperature of 300 ° C. using a twin-screw extruder (TEM-37SS manufactured by Toshiba Machine Co., Ltd.) at the compounding ratios shown in Tables 1 and 2, and a glass fiber reinforced polycarbonate resin composition is prepared. Got In the glass fiber reinforced polycarbonate resin, the polycarbonate resin, the phosphite ester compound, the fatty acid ester and the thermoplastic elastomer are supplied from the first feeder (raw material supply port) into the extruder barrel, and the resin composition is sufficiently melted and then glass. The fibers were supplied into the extruder barrel from the second feeder (filler supply port) and then kneaded to obtain glass fiber reinforced polycarbonate resin composition pellets.

<Bending elastic modulus of molded product>
After each of the pellets of the various resin compositions obtained above was dried at 125 ° C. for 4 hours, the ISO test method was performed at a set temperature of 300 ° C. and an injection pressure of 100 MPa using an injection molding machine (ROBOSHOT S2000i100B manufactured by FANUC). A test piece having a thickness of 4 mm was prepared, and the flexural modulus (rigidity) was measured according to ISO 178 using the obtained test piece. Based on the flexural modulus, it was evaluated according to the following criteria.
⊚: 10 GPa or more 〇: 6 GPa or more and less than 10 GPa ×: less than 6 GPa

<Thermal stability>
The pellets of the various resin compositions obtained above and the test piece for which the flexural modulus (rigidity) was measured were dissolved in dichloromethane to obtain NO. 1 Insoluble matter in the solution was filtered using filter paper. The filtrate was dried up and a certain amount (0.25 g) of the obtained polymer was dissolved in 50 ml of dichloromethane. The viscosity of the dilute dichloromethane solution was measured at 23 ° C. using a Canon Fenceke viscometer, and the viscosity average molecular weight of each test piece was determined using Schnell's formula.
(Schnell's formula) [η] = 1.23 × 10 ^-4・ M ^0.83
[Η]: Intrinsic viscosity, M: Viscosity average molecular weight The decrease in molecular weight, which is an index of thermal stability, is based on the value obtained by subtracting the viscosity average molecular weight of the test piece from the viscosity average molecular weight of the pellet (ΔMv). Evaluated according to the criteria of.
◎: Less than 1000 〇: 1000 or more and less than 2000 ×: 2000 or more

<Release resistance>
After each pellet of the various resin compositions obtained above is dried at 125 ° C. for 4 hours, it is cooled at a cylinder set temperature of 300 ° C. and a mold temperature of 50 ° C. using an injection molding machine (ROBOSHOT S2000i100B manufactured by FANUC). The releasability was evaluated under the condition of 20 seconds. For the mold, a cup-type mold release resistance mold (molded product shape: diameter 70 mm, height 20 mm, thickness 4 mm) is used to measure the protrusion load applied to the protrusion pin when molding the cup mold product. Then, the mold release resistance value was obtained. Based on the release resistance value, it was evaluated according to the following criteria.
⊚: less than 400N 〇: 400N or more and less than 800N ×: 800N or more

<Appearance of molded product>
With respect to the test piece for which the flexural modulus (rigidity) was measured, the degree of roughness of the surface of the molded product due to the glass fiber was visually observed. The surface of the molded product made of glass fiber was evaluated as ⊚, the one with rough surface but acceptable was evaluated as ◯, and the one with severe roughness was evaluated as ×.

<Adhesion between polycarbonate resin and glass fiber>
The cross section of the test piece whose flexural modulus (rigidity) was measured was observed at a magnification of 500 using a scanning electron microscope (S-3400N, manufactured by Hitachi, Ltd.). The glass fibers to which the resin was attached were evaluated based on the overall ratio according to the following criteria, and the evaluation results are shown in the table. Before the observation, the cross section of the test piece was vapor-deposited with gold using an ion sputter (E-1010, manufactured by Hitachi, Ltd.).
⊚: Resin adheres to 70% or more of glass fiber ○: Resin adheres to glass fiber of 50% or more and less than 70% ×: Resin adheres to glass fiber of less than 50%

As shown in Examples 1 to 18 shown in Table 1, those satisfying the constituent requirements of the present invention satisfied the required performance.

On the other hand, as shown in Comparative Examples 1 to 9 shown in Table 2, those which do not satisfy the constituent requirements of the present invention each have the following drawbacks. In Comparative Example 1, the bending elastic modulus was inferior when the blending amount of the glass fiber (B) was smaller than the specified amount. In Comparative Example 2, when the blending amount of the glass fiber (B) was larger than the specified amount, it was impossible to prepare pellets. In Comparative Example 3, when the blending amount of the phosphite ester compound (C) was smaller than the specified amount, the thermal stability was inferior. In Comparative Example 4, the amount of the phosphite ester compound (C) was larger than the specified amount, and the thermal stability was inferior. In Comparative Example 5, the amount of the fatty acid ester (D) blended was less than the specified amount, and the releasability was inferior. In Comparative Example 6, when the blending amount of the fatty acid ester (D) was larger than the specified amount, it was impossible to prepare pellets. In Comparative Example 7, the blending amount of the thermoplastic elastomer (E) was smaller than the specified amount, and the adhesiveness was inferior. In Comparative Example 8, the amount of the thermoplastic elastomer (E) blended was larger than the specified amount, and it was impossible to prepare pellets. In Comparative Example 9, when the amount of the thermoplastic elastomer (E) blended was larger than the specified amount and used in combination, the appearance of the molded product was inferior.

The glass fiber reinforced polycarbonate resin composition of the present invention is excellent in releasability and thermal stability without impairing the excellent mechanical strength and rigidity of the glass fiber reinforced polycarbonate resin composition, and therefore has an industrial utility value. Is expensive. For example, it can be used as a substitute for a metal product used for a thin-walled housing used for an electric device or an electronic device or an internal chassis, and the weight of the product can be reduced. In addition, when an external force is applied to the molded product obtained from such a resin composition, the molded product may bend and damage the electronic components housed inside the molded product. Can be suppressed.

Claims (6)

With respect to 100 parts by weight of the resin composition composed of 40 to 80% by weight of the polycarbonate resin (A) and 20 to 60% by weight of the glass fiber (B).
The following formula:

(In the formula, R ² , R ³ , R ⁵ and R ⁶ each have a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, and 6 to 12 carbon atoms, respectively. Alkylcycloalkyl group, aralkyl group or phenyl group having 7 to 12 carbon atoms. R ⁴ represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms. X is a single bond, a sulfur atom or a formula: -CHR. ^7- (Here, R ⁷ indicates a hydrogen atom, an alkyl group having 1 to 8 carbon atoms or a cycloalkyl group having 5 to 8 carbon atoms). A indicates a group having 1 to 8 carbon atoms. 8 alkylene group or formula: * -COR ^8- (where R8 indicates a single bond or an alkylene group having 1 to 8 carbon atoms, and * indicates a bond on the oxygen side). Y and Z indicate a hydroxyl group, an alkoxy group having 1 to 8 carbon atoms or an aralkyloxy group having 7 to 12 carbon atoms, and the other has a hydrogen atom or 1 to 8 carbon atoms. Indicates an alkyl group.)
0.01 to 0.2 parts by weight of the phosphite ester compound (C) represented by, 0.1 to 2 parts by weight of the fatty acid ester (D), and 0.2 parts by weight of the thermoplastic elastomer (E). A fiber-reinforced polycarbonate resin composition for injection molding, which comprises to 10 parts by weight .
The thermoplastic elastomer (E) is a polystyrene-poly (ethylene / propylene) block copolymer, a polystyrene-poly (ethylene / propylene) block-polystyrene copolymer, a polystyrene-poly (ethylene / butylene) block-polystyrene copolymer. , Polystyrene-poly (ethylene-ethylene / propylene) block-polystyrene copolymer, or fiber-reinforced polycarbonate resin composition for injection molding which is a polyester-based thermoplastic elastomer . The fiber-reinforced polycarbonate resin composition for injection molding according to claim 1, wherein the polycarbonate resin (A) has a viscosity average molecular weight of 16,000 to 30,000. The fiber-reinforced polycarbonate resin composition for injection molding according to claim 1 or 2, wherein the glass fiber (B) is treated with an epoxy-based sizing agent or a urethane-based sizing agent, and the average diameter of the fiber cross section is 6 to 20 μm. Claim 1 that the glass fiber (B) has a flat cross section in which the average value of the major axis of the fiber cross section is 10 to 50 μm and the average value of the ratio of major axis to minor axis (major axis / minor axis) is 2 to 8. Alternatively, the fiber-reinforced polycarbonate resin composition for injection molding according to 2. The fiber-reinforced polycarbonate resin composition for injection molding according to any one of claims 1 to 4, wherein the fatty acid ester (D) is pentaerythritol tetrastearate. A resin injection -molded product obtained by injection-molding the fiber-reinforced polycarbonate resin composition for injection molding according to any one of claims 1 to 5 .