KR20100105840A - Mobile terminal part - Google Patents

Abstract

The present invention provides a portable terminal component made of a polybutylene terephthalate resin composition excellent in physical properties such as mechanical strength and impact strength, and excellent in low shrinkage and low warpage deformation. Specifically, the portable terminal component comprising the polybutylene terephthalate resin composition comprising (A) 40 to 140 parts by weight of a glass fiber having a flat cross-sectional shape relative to 100 parts by weight of the modified polybutylene terephthalate resin.

Description

Mobile terminal component {MOBILE TERMINAL PART}

The present invention relates to a portable terminal component molded from a specific polybutylene terephthalate resin composition. More specifically, the present invention relates to a portable terminal component using a polybutylene terephthalate resin composition excellent in physical properties such as mechanical strength, impact strength, and moldability such as low shrinkage and low warpage deformation.

Various electric and electronic devices such as OA devices, home appliances, telephones, and the like have a demand for miniaturization, and in particular, the demand for small and light weights is strong in portable electronic products. Conventionally, materials such as a case (housing) for accommodating electronic devices of various portable terminals, a reinforcing plate (chassis) for maintaining the strength of the product, and the like include metal materials such as aluminum and magnesium from the viewpoint of protecting the electronic devices. Ceramic materials have been used. However, since the specific gravity of these materials is quite large, starting with 2.69 of aluminum, the ratio of the case to the total weight of the electronic device is large, and it is quite heavy. In addition, metal materials have high cost and are difficult to form, and thus have problems in terms of weight, cost, and productivity. In order to solve the above-mentioned problems inherent in metal materials, plastic materials having low specific gravity, low cost, and excellent molding processability have attracted attention as alternative materials.

Since the specific gravity of a general plastic material is 2.0 or less compared with the specific gravity of a metal material, these can be applied to components, and weight reduction of a portable terminal product can be aimed at. In addition, plastic materials are generally molded by compression molding, injection molding, injection-compression molding, pro-molding, etc. Among them, the injection molding method is excellent in mass productivity, and thus can be lowered in price. It is the molding technique most commonly used as the case molding method of. These portable terminals include a blend material of polycarbonate (PC) resin, acrylonitrile-butadiene-styrene copolymer (ABS) resin, ABS resin and polycarbonate resin or polybutylene terephthalate (PBT) resin. The use of plastic materials such as these alone or composite materials filled with reinforcing materials such as carbon fibers and glass fibers has been studied (Japanese Patent Laid-Open No. 7-60777).

However, the use of general plastic materials alone, such as ABS resins, PC resins, ABS / PC resins, ABS / PBT resins, has relatively low mechanical strength and impact properties such as tensile strength and elastic modulus, so that the thickness of the molded article may be increased or metal may be used. Since it is necessary to use the reinforcement plate of the, there was a problem that the number of parts is increased and product design constraint occurs. On the other hand, in order to improve the mechanical strength, rigidity, and impact characteristics, composite materials reinforced with general glass fibers and carbon fibers have also been proposed, but the effect thereof is not sufficient, and in particular, composite materials reinforced with carbon fibers have high rigidity. It was high, but it was not practical because the material price was significantly higher.

Moreover, the reinforcement resin material using the blend material (Unexamined-Japanese-Patent No. 6-240132) of aromatic polyamide resin and modified polyphenylene resin is proposed. However, in these resin materials, excellent strength and rigidity are obtained, but the impact characteristics are insufficient, and because of the large amount of gas generated during molding, the molding mass production is poor, and a burring treatment generated in the molded article is required. There was a problem of getting high.

On the other hand, JP-A-62-268612 discloses a polybutylene terephthalate resin composition having excellent mechanical strength by using a non-circular cross-sectional fiber having a rectangular cross section as glass fiber. However, ordinary polybutylene terephthalate resins have a problem that the shrinkage generated during the solidification process during molding processing such as injection molding is large, the shrinkage of the molded article is large, and the warpage deformation due to shrinkage anisotropy is large. Like portable terminal components, application to molded articles requiring high strength, high rigidity, high impact, shrinkage and warpage deformation of molded articles, etc., has been difficult.

The objective of this invention is providing the portable terminal component which consists of a polybutylene terephthalate resin composition excellent in physical properties, such as mechanical strength and impact strength, and excellent in low shrinkage and low warpage deformation.

MEANS TO SOLVE THE PROBLEM As a result of earnestly examining in order to solve the said subject, the portable terminal component which can achieve the said objective by shape | molding the resin composition which combined the specific modified polybutylene terephthalate resin and the glass fiber which has a flat cross-sectional shape is provided. It discovered what was obtained and came to complete this invention.

That is, the present invention

(A) To 100 parts by weight of modified polybutylene terephthalate resin,

(B) 40 to 140 parts by weight of glass fiber having a flat cross-sectional shape

It is a portable terminal component which consists of a polybutylene terephthalate resin composition which mix | blends.

This invention is the use of the portable terminal component of the said composition.

The portable terminal component which consists of the polybutylene terephthalate resin composition of this invention has the characteristics which are hard to be destroyed because it is high in weight reduction effect, and is strong also in rigidity and impact. In addition, since the moldability is excellent and post-treatment can be simplified, manufacturing cost can be reduced. The present invention is suitable for a case (housing), a reinforcement plate (chassis), a frame, a hinge, or a peripheral related part thereof of a portable terminal component.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the mobile telephone housing molded in the Example, and its evaluation situation.

Hereinafter, the structural component of the resin material of this invention is demonstrated in detail.

(A) modified polybutylene terephthalate resin used for this invention is (1) polybutylene obtained by carrying out polycondensation reaction of (1) terephthalic acid or its ester formation derivative, and 1, 4- butanediol or its ester formation derivative | guide_body. A polybutylene terephthalate resin containing terephthalate as a main component and having 5 to 30 mol% of isophthalic acid introduced therein as a comonomer unit, or the copolymer, and (2) terephthalic acid or ester formation thereof A modified polyethylene terephthalate copolymer having as its main component a polyethylene terephthalate obtained by polycondensation of a derivative with ethylene glycol or its ester-forming derivative as a comonomer unit, 5-30 mole% of isophthalic acid as a comonomer unit It is a polybutylene terephthalate resin to contain, and isopre which combined (1) and (2) Three types of deoxidation-modified polybutylene terephthalate, isophthalic acid-modified polyethylene terephthalate, and polybutylene terephthalate may be combined.

In any of (1) and (2), isophthalic acid can be used for polycondensation in the form of ester-derivable derivatives such as lower alcohol esters such as dimethyl ester and can be introduced as a copolymer component.

Here, the introduction amount of the isophthalic acid comonomer unit is 5 to 30 mol%, preferably 10 to 30 mol%, particularly preferably 10 to 20 mol%. If the amount is less than 5 mol%, the crystallinity is high, so that the anisotropy of the molding shrinkage becomes large, and the warpage deformation increases. In addition, when the amount of introduction exceeds 30 mol%, the decrease in strength and thermal stability, which is the superior point of the original polybutylene terephthalate, is greatly reduced, and the crystallization is remarkably lowered and delayed, thereby causing a decrease in the molding cycle and a releasability. There is a risk of causing problems that cannot be used practically.

In the case of (1), either the isophthalic acid modified copolymer alone or a combination of the polybutylene terephthalate containing no isophthalic acid modified copolymer and the isophthalic acid component can be used. In combination, it is necessary to include 5-30 mol% of isophthalic-acid components with respect to the total dicarboxylic acid component which combined the isophthalic acid modified copolymer and the polybutylene terephthalate which does not contain an isophthalic acid component. For example, in 100 weight% of combined compositions of the polybutylene terephthalate and 10 mol% isophthalic acid modified copolymer which a carboxylic acid component consists only of terephthalic acid, the ratio of polybutylene terephthalate is less than 50 weight%.

In the case of (2), isophthalic acid modified polyethylene terephthalate and polybutylene terephthalate are used in combination. In this case, it is necessary to include 5-30 mol% of isophthalic acid components with respect to all the dicarboxylic acid components in a modified polyethylene terephthalate. The isophthalic acid-modified polyethylene terephthalate is preferably 10 to 60% by weight when the total amount of isophthalic acid-modified polyethylene terephthalate and polybutylene terephthalate is 100% by weight. If it is less than 10 weight%, the curvature distortion suppression effect is inadequate, and when it exceeds 60 weight%, the moldability as polybutylene terephthalate will be impaired and it may not be able to shape | mold at 100 degrees C or less mold temperature.

(A) Modified polybutylene terephthalate resin can be used as a copolymer copolymerized with the copolymerizable monomer (henceforth only a copolymerizable monomer hereafter) in the range which does not impair the effect of this invention. Examples of the copolymerizable monomer include diols other than terephthalic acid and isophthalic acid, diols other than C2-C4 alkylene glycols, oxycarboxylic acid components, lactone components, and the like. A copolymerizable monomer can be used 1 type or in combination of 2 or more types.

Examples of the dicarboxylic acid (or dicarboxylic acid component or dicarboxylic acid) include aliphatic dicarboxylic acids (e.g., succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebaic acid, undecanedicarboxylic acid, and dode). Kane-dicarboxylic acid, hexadecane dicarboxylic acid, dimer acid, and the like of C _{4 ~ 40-dicarboxylic} acid, preferably a C _{4 ~ 14-dicarboxylic} acid), an alicyclic dicarboxylic acid component (e.g., hexahydro phthalic acid, hexahydro isophthalic acid, hexahydro terephthalic acid, such as hydro, high-mix (hymic) acid C _{8 ~ 12-dicarboxylic} acid), terephthalic acid, aromatic dicarboxylic acid component other than the isophthalic acid (e.g., phthalic acid, naphthalene dicarboxylic acid, such as 2,6-naphthalene dicarboxylic acid, 4,4 '-Diphenyldicarboxylic acid, 4,4'-diphenoxyetherdicarboxylic acid, 4,4'-diphenyletherdicarboxylic acid, 4,4'-diphenylmethanedicarboxylic acid, 4,4'-diphenylketone Dicarboxylic acids, such as available in the C _{8 ~ 16-dicarboxylic} acid), or to form esters, such as those of the reactive derivative (e.g., lower alkyl ester (the die of the acid, such as methyl acid C _{1 ~ 4} alkyl esters, etc.), acid chloride, acid anhydride Derivatives). Moreover, if necessary, polyhydric carboxylic acid, such as trimellitic acid and pyromellitic acid, or its ester formation derivative (alcohol ester etc.) etc. can also be used together. When using such a polyfunctional compound together, a branched polybutylene terephthalate resin can also be obtained.

Diols (or diol components or diols) include, for example, aliphatic alkenidaols except for 1,4-butanediol [e.g. alkenidaols (e.g., ethylene glycol, trimethylene glycol, Propylene glycol, neopentyl glycol, hexanediol (1,6-hexanediol, etc.), octanediol (1,3-octanediol, 1,8-octanediol, etc.) ), decane diols such as lower alkane diol, preferably a straight or branched C _{2 ~ 12} alkane diol, more preferably a straight or branched C _{2 ~ 20} alkane diol, etc.); (Poly) oxy alkylene glycol (for example, a plurality of oxy-C _{2 ~ 4} glycol having an alkylene unit, for example, diethylene glycol, dipropylene glycol, dimethyl tetramethylene glycol and tri ethylene posts Lycol, tripropylene glycol, polytetramethylene glycol, etc.), alicyclic diols (e.g., 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol, hydrogenated bisphenol A and the like), aromatic diol [for example, hydroquinone, resorcinol, naphthalene diol, such as dihydroxy C _{6 ~ 14} arene; Biphenols (4,4'-dihydroxybiphenyl and the like); Bisphenols; Xylylene glycol and the like], and reactive derivatives thereof (e.g., ester-forming derivatives such as alkyl, alkoxy or halogen substituents). If necessary, polyols such as glycerin, trimethylolpropane, trimethylolethane, pentaerythritol, or ester-forming derivatives thereof may be used in combination. When using such a polyfunctional compound together, a branched polybutylene terephthalate resin can also be obtained.

On the other hand, in the copolymer, the ratio of the copolymerizable monomer can be selected from the range of, for example, about 0.01 to 30 mol%, usually 1 to 30 mol%, preferably 3 to 25 mol%, more preferably 5 to 20 mole% (eg, 5 to 15 mole%). In addition, when using in combination a homopolyester (polybutylene terephthalate) and a copolymer (copolyester), the ratio of a homopolyester and a copolyester has the ratio of a copolymerizable monomer with respect to all monomers 0.1 thru | or It is the range which becomes about 30 mol% (preferably 1-25 mol%, More preferably, 5-25 mol%), Usually the former / latter = 99/1-1/99 (weight ratio), Preferably it is 95 / 5-5 / 95 (weight ratio), More preferably, it can select from the range of about 90/10-10/90 (weight ratio).

Moreover, also about modified polyethylene terephthalate resin, it can use as a copolymer copolymerized with the copolymerizable monomer other than isophthalic acid in the range which does not impair the effect of this invention.

On the other hand, as for the intrinsic viscosity (IV) of (A) modified polybutylene terephthalate resin, it is preferable that all are 1.2 dL / g or less, More preferably, it is 1.0 dL / g or less. Intrinsic viscosity of 1.OdL / g or less by blending polybutylene terephthalate resin or modified polyester having a different intrinsic viscosity, for example, by blending polybutylene terephthalate resin of 1.2 dL / g and 0.8 dL / g of intrinsic viscosity Viscosity can also be realized. In addition, intrinsic viscosity (IV) can be measured on condition of temperature 35 degreeC in o-chlorophenol, for example. When the polybutylene terephthalate resin having the intrinsic viscosity in this range is used, it is easy to efficiently provide sufficient toughness and reduce the melt viscosity. If the intrinsic viscosity is too large, the melt viscosity at the time of molding becomes high, and there is a possibility of causing a poor flow of resin and a poor filling in the molding die in some cases.

Glass fiber having a flat cross-sectional shape (B) used in the present invention is a ratio of the long diameter (the longest straight distance of the cross section) and the short diameter (the longest straight distance of the long diameter and the perpendicular direction) of the cross section perpendicular to the longitudinal direction 1.3. 10 to 10, preferably 1.5 to 8, particularly preferably 2 to 5 glass fibers. As a specific shape, they are substantially elliptical, substantially oblong, substantially cocoon, and the like.

(B) A glass fiber having a flat cross-sectional shape is excellent in mechanical strength and impact strength, while suppressing warpage deformation and excellent moldability.

Moreover, it is preferable that the glass fiber which has a flat cross-sectional shape has the average cross-sectional area of 100-300 square micrometers. If it is smaller than 100 square micrometers, the mechanical strength and impact strength are not sufficient, and if it exceeds 300 square micrometers, it causes a problem of gate clogging during injection molding and wear of a mold or a molding machine.

The compounding quantity of the glass fiber which has the flat cross-sectional shape (B) used in this invention is 40-140 weight part with respect to 100 weight part of (A) modified polybutylene terephthalate resins, Preferably it is 50-130 weight part to be. If the blending amount is less than 40 parts by weight, the mechanical strength and impact strength are low, and if it exceeds 140 parts by weight, the fluidity is significantly deteriorated.

(B) In use of the glass fiber which has a flat cross-sectional shape, it is preferable to use a convergence agent or a surface treating agent as needed. When this example is shown, any functional compound, such as an epoxy type compound, an acryl type compound, an isocyanate type compound, a silane type compound, and a titanate type compound, is used preferably. Compounds such as these may be used by performing surface treatment or condensation treatment in advance, or may be added at the same time when preparing a material. In addition, the usage-amount of the functional surface treating agent used together is 0-10 weight% with respect to a filler, Preferably it is 0.01-5 weight%.

As such a glass fiber (B), it can be used irrespective of the alkali glass composition containing A glass, E glass, a zirconia component, and the form of the glass fiber at the time of compounding of chopped strand, roving glass, etc.

The glass fiber having a flat cross-sectional shape (B) used in the present invention is prepared by spinning with a nozzle having an appropriate hole shape such as a rectangular, elliptical, rectangular, or slit shape as a bushing for discharging molten glass. do. Moreover, molten glass is discharged | emitted from several adjacently installed nozzles which have various cross-sectional shape (including circular cross section), and it can prepare by bonding the discharged molten glass mutually and making it as a single filament.

As a portable terminal component, a resin material may be colored and used. In this case, it is common to use an inorganic white pigment simultaneously with various colored pigments and dyes. Examples of inorganic white pigments suitable for the resin composition of the present invention include (C) inorganic white pigments having a Mohs hardness of 4.5 or less, such as zinc sulfide, zinc oxide, barium sulfate, lithopone, magnesium carbonate, dolomite, calcium sulfate, barite and calcium carbonate. And so on. In these white pigments, since the glass fiber breaks little, favorable physical properties can be obtained. On the other hand, rutile type titanium oxide, anatase type titanium oxide, burkite type titanium oxide, etc. in which Mohs' hardness exceeds 4.5, most often generate | occur | produce glass fiber break, and are unpreferable. The compounding quantity of an inorganic white pigment is not specifically limited, What is necessary is just a general coloring required amount.

In addition, the resin composition of this invention can also contain other resin as needed in the range which does not impair the effect of this invention. As other resin, polyester resins other than polybutylene terephthalate resin (polyethylene terephthalate, polytrimethylene terephthalate etc.), polyolefin resin, polystyrene resin, polyamide resin, polyacetal, poly arylene oxide, poly Arylene sulfide, a fluororesin, etc. are illustrated. Moreover, copolymers, such as an acrylonitrile- styrene resin, an acrylonitrile- butadiene- styrene resin, ethylene- ethylacrylate resin, are also illustrated. These other resins may be used alone or in combination of two or more thereof.

Moreover, various additives (stabilizer, moldability improving agent, etc.) can also be added to the resin composition of this invention. Examples of the additive include various stabilizers (antioxidants, ultraviolet absorbers, heat stabilizers, etc.), nucleating agents (crystallization nucleating agents), flame retardants, lubricants, mold release agents, antistatic agents, coloring agents such as salts and pigments, and the like.

In particular, when polybutylene terephthalate and polyesters having different alkylene glycol components, including polycarbonate and polyethylene terephthalate, are used in combination, it is preferable to add a phosphorus-based stabilizer for suppressing ester exchange. Examples of the phosphorus stabilizer used are organic phosphite compounds, phosphonite compounds, metal phosphate salts and the like. Specific examples thereof include bis (2,4-di-t-4methylphenyl) pentaerythritol diphosphite, bis (2,4-di-t-butylphenyl) pentaerythritol diphosphite, tetrakis (2, Examples of 4-di-t-butylphenyl) -4,4'-biphenylene phosphonite and a metal phosphate salt include first calcium phosphate and hydrate of first sodium phosphate.

On the other hand, other reinforcing filler can be added to the resin composition of this invention as needed in the range which does not impair the effect of this invention. Other fillers for reinforcement include glass fibers, milled glass fibers, glass beads, glass flakes, silica, alumina fibers, zirconia fibers, potassium titanate fibers, carbon fibers, graphite, calcium silicates, other than those specified in the present invention. Metal oxides such as silicate such as aluminum silicate, kaolin, talc, clay, iron oxides, titanium oxide, zinc oxide, antimony oxide, alumina, carbonates or sulfates of metals such as calcium, magnesium, zinc, silicon carbide, silicon nitride, Boron nitride etc. are illustrated, As an organic filler, aromatic polyester fiber of high melting | fusing point, liquid crystalline polyester fiber, aromatic polyamide fiber, fluororesin fiber, polyimide fiber, etc. are illustrated.

Preparation of the composition of this invention is easily prepared by the facilities and methods generally used as a conventional resin composition preparation method. For example, after mixing each component, mixing and extruding with a single screw or twin screw extruder to prepare pellets, and then molding, pellets having a different composition once, and mixing the pellets in a predetermined amount to provide molding And any method such as a method of obtaining a molded article having a desired composition after molding, a method of directly injecting one or two or more components of each component into the molding machine, and the like. In addition, mixing and adding a part of resin component with components other than as fine powder is a preferable method in carrying out the uniform compounding of these components. As a molding method for filling the resin into a mold, injection molding, extrusion molding, compression molding, pro-molding, vacuum molding, rotational molding, gas injection molding, and the like are applicable, but injection molding is common.

Example

Hereinafter, although an Example demonstrates this invention still in detail, this invention is not limited to these.

Examples 1 to 8, Comparative Examples 1 to 7

Dry blend each resin composition by the mixing ratio shown in Table 1, melt-knead at cylinder preset temperature 250 degreeC using the twin screw extruder (made by Nihon Steel Co., Ltd.) which has a screw of 30 mm, and pelletize it, and test piece Was made and each evaluation was performed. The results are shown in Table 1.

In addition, the detail of the used component and the measuring method of physical property evaluation are as follows.

(1) ingredients used

(A) component

(A-1) isophthalic acid-modified polybutylene terephthalate (high viscosity IV = 0.65 dL / g)

In the reaction of terephthalic acid and 1,4-butanediol, a modified polybutylene terephthalate using 12.5 mol% of dimethylisophthalic acid as a copolymerization component in place of a part (12.5 mol%) of terephthalic acid

(A-2) polybutylene terephthalate (high viscosity IV = 0.69dL / g, manufactured by Wintech Polymer Co., Ltd.)

(A-3) Isophthalic acid modified polyethylene terephthalate (12.0 mol% modification of isophthalic acid, intrinsic viscosity IV = 0.80dL / g, manufactured by Bell Polyester Products Co., Ltd.)

(B) glass fiber

(B-1): glass fiber having a flat cross-sectional shape (long diameter and short diameter ratio: 4, average cross-sectional area of 196 µm ² , manufactured by Nittobo Co., Ltd.)

(B'-1): Glass fiber which has a general circular cross-sectional shape (Long-diameter-short-diameter ratio: 1, average cross-sectional area 133 micrometers ² , the Nippon Electric Glass Co., Ltd. product).

(C) white pigment

(C-1) Zinc sulfide: Mohs hardness 4

(C'-1) rutile titanium oxide: Mohs hardness 7

In addition, about Example 6, 7, 8, and the comparative example 5, 0.15 weight part of 1st calcium phosphates are added to the composition in a table | surface further.

(2) property evaluation

Tensile Strength

After drying the obtained pellet for 3 hours at 140 degreeC, the tensile test piece was produced by injection molding at the molding machine cylinder temperature of 260 degreeC, and the mold temperature of 80 degreeC, and measured according to ISO-527 (test piece thickness 4mm).

<Charpy Impact Strength>

After drying the obtained pellets at 140 degreeC for 3 hours, the Charpy impact test piece was produced by injection molding at the molding machine cylinder temperature of 260 degreeC, and the mold temperature of 80 degreeC, and measured according to ISO-179 (test piece thickness 4mm).

(3) evaluation of bending deformation

The flatness of the flat plate was measured based on the following criteria.

Evaluation molded article: 50 mm x 50 mm x 1 mm thick flat plate

Molding Machine: FANUC ROBOSHOT α-1OOla

Cylinder temperature: 260-260-240-220 ℃

Mold temperature: 80 ℃

Injection pressure: 69MPa

Planar measuring instrument: CNC image measuring instrument Quick Vision QVH404 (manufactured by Mitsutoyo Corporation)

The planar measurement method was measured at 9 points (3 * 3 points of length and width) on a flat plate.

(4) evaluation in mobile phone housing

The mobile phone housing shown in FIG. 1 was molded and (4-1) to (4-3) were evaluated.

Molding Machine: Sumitomo Heavy Industries SE1OOD

Cylinder temperature: 270-270-260-230 ℃

Mold temperature: 100 ℃

(4-1) Bending Strength of Hinge of Mobile Phone Housing

The hinge part of FIG. 1 was pressed and bent, and the breaking strength was measured.

Measuring instrument: Universal testing machine Tensilon UTA50KN (manufactured by Orien Tech Co., Ltd.)

Measuring speed: 1,000mm / min

(4-2) Contraction of Boss Section of Mobile Phone Housing

The shrinkage condition of the surface of the boss | hub part of FIG. 1 was visually observed.

judgment

○… Less shrink

×… High shrinkage

(4-3) Burning of the mobile phone housing (compression heat generated by gas)

The burning situation of the hinge flow end of FIG. 1 was visually observed.

judgment

○… Less burning

×… Much burning

Claims (8)

(A) To 100 parts by weight of the modified polybutylene terephthalate resin,
(B) 40 to 140 parts by weight of glass fiber having a flat cross-sectional shape
The portable terminal component which consists of a polybutylene terephthalate resin composition which mix | blends. The method of claim 1,
(A) The polybutylene terephthalate portable terminal component whose modified polybutylene terephthalate resin is isophthalic acid modified polybutylene terephthalate containing 5-30 mol% of isophthalic acid with respect to all the dicarboxylic acid components. The method of claim 1,
(A) The portable terminal component whose modified polybutylene terephthalate resin is a mixture of a polybutylene terephthalate and an isophthalic acid modified polyethylene terephthalate. The method according to any one of claims 1 to 3,
(B) A glass fiber having a flat cross-sectional shape has a ratio of the long diameter (longest straight line length of the cross section) and the short diameter (the longest straight line length of the cross section perpendicular to the longitudinal direction) in the range of 1.3 to 10. Mobile terminal parts that are. The method according to any one of claims 1 to 4,
(B) The portable terminal component whose glass fiber which has a flat cross-sectional shape is 100-300 square micrometers in average cross-sectional area. 6. The method according to any one of claims 1 to 5,
Furthermore, (C) Mobile terminal component colored using inorganic white pigment of Mohs hardness 4.5 or less. The method according to any one of claims 1 to 6,
A portable terminal component which is a case (housing), a reinforcing plate (chassis), a frame, a hinge, or a peripheral related part of the portable terminal component. The portable terminal component use of the composition of Claim 1.

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