KR20100110794A - Polybutylene terephthalate resin composition and thin molded article - Google Patents

Abstract

The present invention provides a polybutylene terephthalate resin composition having excellent mechanical strength and impact strength, low warpage deformation, and improved flowability (melt flowability). Specifically, (A) 40 to 140 parts by weight of glass fiber having a flat cross-sectional shape, (C) glycerin and / or its dehydrated condensate with respect to 100 parts by weight of polybutylene terephthalate resin, fatty acids having 12 or more carbon atoms 0.05 to 5 parts by weight of glycerin fatty acid ester having a hydroxyl value of 200 or more as measured by the method described in the text.

Description

Polybutylene terephthalate resin composition and thin molded article {POLYBUTYLENE TEREPHTHALATE RESIN COMPOSITION AND THIN MOLDED ARTICLE}

This invention relates to the polybutylene terephthalate resin composition excellent in mechanical strength, impact strength, fluidity | liquidity, and a little deformation | transformation, and a thin molded article. More specifically, the present invention relates to a polybutylene terephthalate resin composition and a thin molded article suitable for molded articles such as electric and electronic components such as switches and capacitors, taking advantage of its excellent features.

Crystalline thermoplastic polyester resins, such as polyalkylene terephthalate resins, have excellent mechanical, electrical, and other physical and chemical properties, and also have good processability. Is being used.

Although these crystalline thermoplastic polyester resins are used alone in various molded articles, various reinforcing agents and additives have been blended for the purpose of improving their properties, particularly mechanical properties, depending on the field of use. And in the field where high mechanical strength and rigidity are calculated | required, it is known to use fibrous reinforcement represented by glass fiber, carbon fiber, etc.

However, although the crystalline thermoplastic polyester resin containing a general fibrous reinforcement agent improves mechanical strength and impact strength, shrinkage anisotropy generated during solidification during molding processing such as injection molding increases, so that warpage deformation of the molded article is increased. There is a problem that it grows significantly. For this reason, polybutylene terephthalate resin containing a general fibrous reinforcing agent was difficult to apply to a thin plate-shaped molded article.

As a method of solving these problems, mix | blending amorphous heteropolymers, such as a polycarbonate (Japanese Unexamined-Japanese-Patent No. 9-291204), with modified polybutylene terephthalate resin is proposed. However, in the method of blending polycarbonate, there is a problem that the fluidity is significantly lowered and the impact strength is lowered, and application to the thin molded article has been difficult.

In addition, although it is proposed to use a glass fiber having a flat cross section as a reinforcing glass fiber (Japanese Patent Laid-Open No. 7-309999, Japanese Patent Laid-Open No. 2004-248487), in order to obtain high mechanical strength and high impact strength, The filling amount of the glass fiber has to be increased, which causes a significant decrease in fluidity, thereby preventing the formation of a thin molded article.

It is also known to add a fluidity improver to polybutylene terephthalate resin in order to improve fluidity. For example, as a fluidity improving agent, the resin composition which mixed the specific aromatic polybasic acid ester is disclosed (Unexamined-Japanese-Patent No. 61-85467). However, in the resin composition described in this document, mechanical strength tends to be lowered as compared with the case where no fluidity improver is added.

As mentioned above, in the well-known polybutylene terephthalate resin composition, the composition which shows little bending deformation, high strength, and high impact lacks fluidity | liquidity, and application to the thin plate-shaped molded article was very difficult.

An object of the present invention is to provide a polybutylene terephthalate resin composition having excellent mechanical strength and impact strength, less warpage deformation, and improved flowability (melt flowability) and a molded article thereof.

MEANS TO SOLVE THE PROBLEM As a result of earnestly examining in order to solve the said subject, as a result, the resin composition which can achieve the said objective is obtained by combining and combining a glass fiber which has a flat cross-sectional shape, and a specific glycerin fatty acid ester with polybutylene terephthalate resin. It has been found that the present invention has been completed.

That is, the present invention

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

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

(C) 0.05 to 5 parts by weight of glycerin fatty acid ester, consisting of glycerin and / or its dehydration condensate and a fatty acid having 12 or more carbon atoms, and having a hydroxyl value of 200 or more, as measured by the method described in the text.

It is a polybutylene terephthalate resin composition which mix | blended and a thin molded article which consists of it.

The polybutylene terephthalate resin composition of the present invention is excellent in mechanical strength and impact strength, has low warpage deformation, and is excellent in fluidity (melt fluidity). The polybutylene terephthalate resin composition of the present invention is applicable to a thin molded article from the characteristics thereof, and is suitable for a case of various electronic devices and the like, in particular a switch, a capacitor, a connector, an integrated circuit (IC), a relay, a resistor, a light emitting diode (LED), coil bobbins, electronic devices, portable terminals, ECUs, various sensors, power modules, gear parts and their peripherals, or molded articles such as housings or chassis.

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

(A) polybutylene terephthalate resin

The polybutylene terephthalate resin is a thermoplastic resin containing at least terephthalic acid (terephthalic acid or its ester-forming derivative) and alkylene glycol (1,4-butanediol or its ester-forming derivative) having 4 carbon atoms as a polymerization component. . (A) Polybutylene terephthalate resin of this invention is not only polybutylene terephthalate homopolymer, but also polybutylene terephthalate containing isophthalic acid modified polybutylene terephthalate and isophthalic acid modified polyester. In the warpage deformation aspect, isophthalic acid-modified polybutylene terephthalate and polybutylene terephthalate containing isophthalic acid-modified polyester can be preferably used.

Isophthalic acid-modified polybutylene terephthalate is an alkylene glycol component having 1,4-butanediol or an ester-forming derivative thereof, and isophthalic acid or an ester-forming derivative thereof (dimethyl ester) such as terephthalic acid or an ester-forming derivative thereof. And lower alcohol esters) as a comonomer unit.

In addition, isophthalic acid-modified polyesters are terephthalic acid or ester-forming derivatives thereof, and alkylene glycols having 2 to 4 carbon atoms, particularly preferably ethylene glycol, trimethylene glycol, 1,4-butanediol or It is a copolymer which has polyester obtained by polycondensation reaction of this ester forming derivative as a main component, and introduce | transduced isophthalic acid or its ester forming derivative (lower alcohol ester like dimethyl ester) as a comonomer unit.

The introduction amount of the isophthalic acid modified polybutylene terephthalate and the isophthalic acid comonomer unit of the isophthalic acid modified polyester is preferably 5 to 30 mol%, more preferably 10 to 30 mol%, particularly preferably 10 to 20 mol %to be. If the amount is less than 5 mol%, the crystallinity is high, so the low warpage effect may be low. 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. On the other hand, when using the mixture of polybutylene terephthalate and isophthalic acid modified polyester as a base resin, it is preferable that the content rate of isophthalic acid with respect to all the dicarboxylic acid components is 5-30 mol%.

Polybutylene terephthalate as a base 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.

As dicarboxylic acid (or a dicarboxylic acid component or dicarboxylic acid), aliphatic dicarboxylic acid (for example, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebaic acid, undecanedicarboxylic acid, 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 hydro terephthalic acid, high-mix (hymic) acid such as the C _{8 ~ 12-dicarboxylic} acid), aromatic dicarboxylic acid component other than terephthalic acid (e.g., phthalic acid, 2,6-naphthalene dicarboxylic acid, such as naphthalene dicarboxylic acid, 4,4'- Phenyldicarboxylic acid, 4,4'-diphenoxyetherdicarboxylic acid, 4,4'-diphenyletherdicarboxylic acid, 4,4'-diphenylmethanedicarboxylic acid, 4,4'-diphenylketonedicarboxylic acid C _{8 ~ 16-dicarboxylic} acid, etc.), or a reactive derivative (e.g., lower alkyl ester (dimethyl the acid such as phthalic acid C _{1 ~ 4} alkyl esters, etc.), an acid chloride, an ester formable derivative such as an acid anhydride) Etc. can be mentioned. 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).

On the other hand, it is preferable that all the intrinsic viscosity (IV) of (A) polybutylene terephthalate resin are 1.0 dL / g or less, More preferably, it is 0.9 dL / g or less. Intrinsic viscosity of 1.OdL / g or less by blending polybutylene terephthalate resins or modified polyesters having different intrinsic viscosities, for example by blending polybutylene terephthalate resins having an intrinsic viscosity of 1.2 dL / g and 0.8 dL / g 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. When smaller than 100 square micrometers, the mechanical strength and impact strength are not sufficient, and when it exceeds 300 square micrometers, gate blockage at the time of injection molding and abrasion of a metal mold | die and a molding machine arise.

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) polybutylene terephthalate resin, Preferably it is 50-120 weight part. . 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.

Next, (C) glycerin fatty acid ester used by this invention consists of glycerin and / or its dehydration condensate, and a C12 or more fatty acid, and is a fatty acid ester whose hydroxyl value measured by the later method is 200 or more. Usually, when a fluidity improver etc. are added to polybutylene terephthalate resin, even if fluidity | liquidity can be improved, the fall of characteristics, such as mechanical strength and toughness which polybutylene terephthalate resin itself has, cannot be avoided. In the present invention, by using a specific glycerin fatty acid ester (C), the fluidity of the polybutylene terephthalate resin composition can be efficiently improved while maintaining the above characteristics at a high level.

(C) Glycerin fatty acid ester can be manufactured by a well-known method by itself, a commercial item can also be used, and esterification was adjusted so that the hydroxyl value measured by the later method may be 200 or more, Preferably Has a hydroxyl group of 250 or more. If the hydroxyl value is less than 200, the effect of improving fluidity is small, which is not preferable.

Examples of the fatty acid having 12 or more carbon atoms constituting the ester of glycerin fatty acid ester include lauric acid, oleic acid, palmitic acid, stearic acid, behenic acid and montanic acid, preferably fatty acids having 12 to 32 carbon atoms, particularly preferred. Preferably fatty acids having 12 to 22 carbon atoms are used, and loric acid, stearic acid or behenic acid are particularly preferred. In the case of carbon number less than 12, heat resistance may fall, and it is unpreferable, and in the case of carbon number exceeding 32, since the effect of improving fluidity is small, it is not preferable.

Examples of preferred glycerin fatty acid esters include glycerin monostearate, glycerin monobehenate, diglycerine monostearate, triglycerine monostearate, tetraglycerine stearic acid ester, and decaglycerol acid partial ester.

The compounding quantity of (C) glycerin fatty acid ester is 0.05-5 weight part with respect to 100 weight part of (A) polybutylene terephthalate resins, Preferably it is 0.5-3 weight part. (C) When the amount of the glycerin fatty acid ester is less than 0.05 part by weight, the effect of improving fluidity may not be sufficiently obtained. When the amount of the glycerin fatty acid ester is more than 5 parts by weight, the amount of gas generated increases depending on the molding. It may cause contamination.

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 using together polybutylene terephthalate and modified polyester in which an alkylene glycol component differs, it is preferable to add a phosphorus stabilizer for ester exchange suppression. 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 is prepared, and the pellets are mixed 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. The fluidity | liquidity of the resin composition of this invention can reflect melt viscosity under conditions under the constant piston flow shear rate as an index | index. For example, the melt viscosity of the resin composition of the present invention is 200 Pa · s or less, preferably 170 Pa · s or less, more preferably 150 Pa · s at a shear rate of 1,000 sec ⁻¹ at a temperature of 260 ° C. in accordance with ISO11443. It can also be set as below (for example, about 50-150 Pa.s). The measurement result is obtained in the unit of Pa · s as described above, but the lower the value is, the better the fluidity at the time of melting and the excellent fluidity at the time of molding.

On the other hand, in general, a melt index measured under conditions of 235 ° C and a load of 2160 g in ASTMD-1238 is used as an index of fluidity, but the melt index is measured under a constant load, and the shear rate of the piston is determined by the resin. Is different. On the other hand, in view of the fact that the melt viscosity measurement index under a constant piston flow is regarded as an index closer to the actual flow characteristics in consideration of the fact that the actual injection molding is performed at a constant piston flow, in the present invention, such a constant shear rate condition The melt viscosity in is taken as an index of fluidity.

Since the resin composition of this invention is excellent in melt flow property as mentioned above, molding processability is favorable and it is useful for manufacturing the molded object or molded article with high mechanical strength and heat resistance.

In particular, it is suitable for manufacturing a molded article in which a thin part exists. For example, molding of an injection molded article having a thickness of 1 mm or less in injection molding at a cylinder temperature of 260 ° C. and a mold temperature of 80 ° C., which are manufacturing conditions for injection molding of ordinary polybutylene terephthalate resin, becomes possible. For example, it is possible to mold at an injection speed of 67 mm / sec with an injection molding machine having a mold clamping force of 100 t and a screw diameter of 30 mm.

It may be calculated | required that the flow length in 1 mm thickness is 120 mm or more, and the flow length of 120 mm or more is also possible as it is the resin composition of this invention.

As a thin molded article having a part having a thickness of 1 mm or less in a part of the molded article, a switch, a capacitor, a connector, an integrated circuit (IC), a relay, a resistor, a light emitting diode (LED), a coil bobbin, an electronic device, a mobile terminal, an ECU, and various sensors , Power modules, gear parts and their peripherals or housings or chassis thereof.

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 7, Comparative Examples 1 to 6

Each resin composition was dry blended at the mixing ratios shown in Tables 1 and 2, and melt kneaded at a cylinder set temperature of 250 ° C. using a twin screw extruder (manufactured by Nihon Steel Co., Ltd.) having a screw of 30 mm, followed by pelletization. The test piece was created and each evaluation was performed. The results are shown in Tables 1 and 2.

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

(A) polyester resin

(A-1) polybutylene terephthalate (high viscosity IV = 0.69dL / g, manufactured by Wintech Polymer Co., Ltd.)

(A-2) Isophthalic acid modified polyethylene terephthalate (12.0 mol% isophthalic acid modification, intrinsic viscosity IV = 0.80dL / g, manufactured by Bell Polyester Products Co., Ltd.)

(A-3) isophthalic acid modified polybutylene terephthalate (high viscosity IV = 0.65dL / g)

In the reaction of terephthalic acid with 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

(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) glycerin fatty acid ester

(C-1) glycerin monostearate (hydroxy group 330, Kao Corporation "electrostripper TS-5")

(C-2) glycerin monobehenate (hydroxyl group 300, "kenikemal B-1OO" made by Rickenvitamin)

(C-3) Triglycerin stearic acid partial ester (hydroxyl group 280, `` Likenmal AF-70 '' made by Rickenvitamin)

(C-4) Decaglycerol acid partial ester (hydroxyl group 600, "kenem L-021" made by Rickenvitamin)

(C'-1) glycerin tristearate (87 hydroxyl group, "kenem S-95" made by Rikenvitamin)

In addition, the hydroxyl value of (C) glycerin fatty acid ester was measured by the Petrochemical Association method 2, 4, 9, 2-71 hydroxyl group (pyridine and anhydrous acetic acid method).

In addition, about Example 7, 0.15 weight part of monobasic calcium phosphates are added to the composition in the table | surface.

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).

<Melt viscosity>

After drying the obtained pellets at 140 degreeC for 3 hours, using capillograph 1B (made by Toyo Seiki Co., Ltd.), according to ISO 11443, shear rate 1, the furnace temperature is 260 degreeC and capillary-phi 1mm * 20mmL. It measured as 00O second ^-1 . The lower the value, the better the fluidity at the time of melting, and the better the fluidity at the time of molding.

<Liquidity>

The flow length of thickness 1mm was measured based on the following reference | standard.

Evaluation molded article: spiral flow of thickness 1mm X width 20mm

Molding machine: FANUC S200Oi-100B (screw diameter φ30mm)

Cylinder temperature: 260-260-260-230 ℃

Mold temperature: 80 ℃

Injection pressure: 98MPa

Injection Speed: 67mm / sec

<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.

Claims (10)

(A) 100 parts by weight of polybutylene terephthalate resin,
(B) 40 to 140 parts by weight of glass fiber having a flat cross-sectional shape,
(C) 0.05 to 5 parts by weight of glycerin fatty acid ester, consisting of glycerin and / or its dehydration condensate and a fatty acid having 12 or more carbon atoms, and having a hydroxyl value of 200 or more, as measured by the method described in the text.
Polybutylene terephthalate resin composition which mix | blends. The method of claim 1,
(A) Polybutylene terephthalate resin is polybutylene terephthalate containing isophthalic acid modified polyester, The polybutylene terephthalate resin composition whose content rate of isophthalic acid with respect to all the dicarboxylic acid components is 5-30 mol%. . The method of claim 1,
(A) Polybutylene terephthalate resin composition whose polybutylene terephthalate resin is 5-30 mol% isophthalic acid modified polybutylene 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. What is polybutylene terephthalate resin composition. The method according to any one of claims 1 to 4,
(B) The polybutylene terephthalate resin composition whose glass fiber which has a flat cross-sectional shape is an average cross-sectional area of 100-300 micrometers. 6. The method according to any one of claims 1 to 5,
(C) The polybutylene terephthalate resin composition whose fatty acid which comprises glycerin fatty acid ester is loric acid, stearic acid, or behenic acid. The method according to any one of claims 1 to 6,
The polybutylene terephthalate resin composition whose measured value of melt viscosity in the shear rate 1000 sec <^-1> in temperature 260 degreeC based on ISO11443 is 200 Pa * s or less. The molded article made of the polybutylene terephthalate resin composition of any one of Claims 1-7 whose flow length in 1 mm thickness is 120 mm or more in injection molding at the cylinder temperature of 260 degreeC, and the die temperature of 80 degreeC. The method of claim 8,
A thin molded article having a part having a thickness of 1 mm or less on a part of the molded article. The method according to claim 8 or 9,
Switches, Capacitors, Connectors, Integrated Circuits (ICs), Relays, Resistors, Light Emitting Diodes (LEDs), Coil Bobbins, Electronics, Portable Terminals, ECUs, Sensors, Power Modules, Gear Components and Their Peripherals or Their Housings or Chassis Thin molded article.