JPH09296096A - Polyethylene terephthalate resin composition - Google Patents

Abstract

(57) [Summary] [Structure] (A) Polyethylene terephthalate resin 100 having at least 80% ethylene terephthalate repeating units polymerized using a germanium catalyst.
0.05 to 30 parts by weight of an epoxy compound (B) having at least two epoxy groups in the molecule and having no ester bond in the molecule, (C) a fibrous reinforcing agent 2 with respect to parts by weight.
To 150 parts by weight, and (D) an inorganic nucleating agent in an amount of 0.01 to 50 parts by weight, a polyethylene terephthalate resin composition. [Effect] It has excellent wet heat resistance, fluidity, mechanical strength, and crystallization rate, and high cycle molding is possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyethylene terephthalate resin composition which is excellent in moist heat resistance, fluidity, mechanical strength, has a high crystallization rate and can be subjected to high cycle molding.

[0002]

2. Description of the Related Art Polyethylene terephthalate resins are
Since it has excellent mechanical properties and chemical properties, it has been widely used as a fiber, a film, a molding material, and the like. As the catalyst used during the polymerization of polyethylene terephthalate resin, antimony compounds are generally used because they are the most industrially advantageous, but other known compounds include germanium compounds, tin compounds and titanium compounds. Has been. In addition, since the polyethylene terephthalate resin has a relatively low crystallization rate, when used for injection molding, it is necessary to keep the mold at a high temperature and to lengthen the cooling time, which causes a problem during molding. Has become. In order to solve this, various crystal nucleating agents for promoting crystallization have been studied for a long time, and for example, organic nucleating agents such as organic carboxylic acid metal salts and inorganic nucleating agents such as talc are often used. There is. On the other hand, since the polyethylene terephthalate resin has an ester bond in the molecule, the ester bond is hydrolyzed when exposed to conditions such as high temperature and high humidity for a long time, so that the mechanical strength is lowered, that is, the wet heat resistance is lowered. There is a problem. Therefore, the application of the polyethylene terephthalate-based resin to applications requiring moisture and heat resistance such as electric rice cooker applications is limited. In order to improve this, for example, JP-A-46-5389 discloses a method in which a compound having a carbodiimide group in the molecule is blended with a polyethylene terephthalate resin to prevent a decrease in strength. Further, Japanese Patent Publication No. 47-13860 shows that the addition of a polyfunctional compound such as an epoxy compound to polyethylene terephthalate can increase the molecular weight and improve the impact strength.

[0003]

However, the compound having a carbodiimide group in the molecule is expensive, and when it is blended with a polyethylene terephthalate resin, it has a drawback that it is easily colored. It is also possible to add a polyfunctional epoxy compound to improve the moist heat resistance to some extent, but this method reduces the fluidity of the obtained resin and is not suitable for applications such as injection molding of thin-walled molded products. . In addition, if a crystal nucleating agent of an organic acid metal salt is added to the resin in order to increase the crystallization rate of the polyethylene terephthalate resin, the wet heat resistance is deteriorated, which is unsuitable for applications requiring wet heat resistance.

[0004]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have found that polyethylene terephthalate resin polymerized using a germanium catalyst has By adding specific amounts of a compound having two or more epoxy groups and not having an ester bond in the molecule, a fibrous reinforcing agent, and an inorganic nucleating agent, excellent wet heat resistance, fluidity, and mechanical properties. It has been found that high cycle molding is possible by exhibiting a high mechanical strength and improving the crystallization rate of a polyethylene terephthalate resin, and has reached the present invention.

That is, according to the present invention, (A) 100 parts by weight of a polyethylene terephthalate resin having at least 80% of ethylene terephthalate repeating units polymerized by using a germanium catalyst, and (B) an epoxy group in the molecule. 0.05 to 30 parts by weight of an epoxy compound having at least two and not having an ester bond in the molecule
The content is a polyethylene terephthalate-based resin composition obtained by blending (C) 2 to 150 parts by weight of a fibrous reinforcing agent and (D) 0.01 to 50 parts by weight of an inorganic nucleating agent.

The (A) polyethylene terephthalate resin used in the present invention is a polymer obtained by using a germanium catalyst as a catalyst during polymerization. The germanium compound used as the polymerization reaction catalyst, germanium oxide such as germanium dioxide, germanium tetraethoxide, germanium alkoxide such as germanium tetraisopropoxide, germanium hydroxide and its alkali metal salts, germanium glycolate, germanium chloride, Examples thereof include germanium acetate, and these may be used alone or in combination of two or more. Among them, germanium dioxide is preferable. The addition amount of the germanium compound is 0.005 with respect to polyethylene terephthalate.
~ 0.1 wt% is preferred, 0.01-0.05 wt%
Is more preferable. If it is less than 0.05% by weight, the polymerization of the (A) polyethylene terephthalate resin is difficult to proceed, and if it exceeds 0.1% by weight, a large amount of germanium catalyst remains in the obtained resin, which is an undesirable side reaction. May occur. The addition may be made at any time before the start of the polymerization reaction.

The polyethylene terephthalate resin used in the present invention contains at least 80%, preferably 85% or more, and more preferably 90% or more ethylene terephthalate repeating units. When the repeating unit of ethylene terephthalate is less than 80%, the excellent physical property balance, which is a characteristic of the polyethylene terephthalate resin, is lost. As the copolymerization component, a known acid component, alcohol and / or phenol component, or ester-forming derivative thereof can be used. As the acid component, a divalent or higher aromatic carboxylic acid having 8 to 22 carbon atoms, or 4 carbon atoms
To a divalent or higher aliphatic carboxylic acid having 12 to 12 carbon atoms, a divalent or higher alicyclic carboxylic acid having 8 to 15 carbon atoms, and an ester-forming derivative thereof. Specifically, in addition to terephthalic acid, for example, isophthalic acid, naphthalenedicarboxylic acid, bis (p-carboxyphenyl) methaneanthracene dicarboxylic acid, 4,4'-diphenyldicarboxylic acid, 1,2-bis (phenoxy) ethane-4. , 4 '
-Dicarboxylic acid, 5-sodium sulfoisophthalic acid,
Adipic acid, sebacic acid, azelaic acid, dodecanedioic acid, maleic acid, trimesic acid, trimellitic acid, pyromellitic acid, 1,3-cyclohexanedicarboxylic acid,
1,4-cyclohexanedicarboxylic acid, and ester-forming derivatives thereof, and the like, which may be used alone or
Used in combination of more than one species.

As the alcohol and / or phenol component, a divalent or more aliphatic alcohol having 3 to 15 carbon atoms,
Examples thereof include divalent or higher-valent alicyclic alcohols having 6 to 20 carbon atoms, divalent or higher-valent aromatic alcohols or phenols having 6 to 40 carbon atoms, and ester-forming derivatives thereof.
Specifically, propanediol, butanediol, hexanediol, decanediol, neopentyl glycol, cyclohexanedimethanol, cyclohexanediol, 2,2'-bis (4-hydroxyphenyl) propane, 2,2'-bis (4 -Hydroxycyclohexyl) propane, hydroquinone, glycerin, pentaerythritol, and ester-forming derivatives thereof. In addition, oxy acids such as p-oxybenzoic acid and p-hydroxyethoxybenzoic acid, their ester-forming derivatives, and cyclic esters such as ε-caprolactone can also be used. Further, it is also possible to use those obtained by partially copolymerizing a polyalkylene glycol unit such as polyethylene glycol, polypropylene glycol or polytetramethylene glycol in the polymer chain.
These may be used alone or in combination of two or more.

The method for producing the above-mentioned polyethylene terephthalate resin is not particularly limited except for the catalyst used, and various known polymerization methods can also be used. For example, first, a method in which terephthalic acid and ethylene glycol are directly esterified in the absence of a catalyst or a catalyst (a tin compound or a titanium compound is used), or dimethyl terephthalate and ethylene glycol are used as a catalyst (magnesium, zinc). , A compound such as cobalt, calcium, manganese is used), a polymer having a low degree of polymerization is synthesized by a method of transesterification in the presence of a compound having a low degree of polymerization, and then the polymer having a low degree of polymerization is heated at high temperature under high vacuum. A method of producing a polyethylene terephthalate resin by adding a polymerization catalyst composed of a germanium compound to carry out condensation polymerization by melt polycondensation or solid phase polycondensation, and performing transesterification and deethylene glycol.
When condensation-polymerizing a polymer having a low degree of polymerization, the use of a polyethylene terephthalate-based resin polymerized with a catalyst other than a germanium compound, for example, an antimony-based catalyst that is commonly used improves the resistance to moist heat. It is not suitable for injection molding of thin-walled molded products because it is inferior in effect and the fluidity is lowered.

When producing a polyethylene terephthalate resin, a phosphoric acid compound such as phosphoric acid, phosphorous acid, hypophosphorous acid, monomethyl phosphate, dimethyl phosphate, phosphorus is used for the purpose of improving color tone. Trimethyl phosphate, methyl diethyl phosphate, triethyl phosphate, triisopropyl phosphate, tributyl phosphate, triphenyl phosphate, tribenzyl phosphate, tricyclohexyl phosphate, trimethyl phosphite, methyl diethyl phosphite, triethyl phosphite Compounds such as triisopropyl phosphite, tributyl phosphite, and triphenyl phosphite may be added alone or in combination of two or more after esterification reaction or transesterification reaction.

Further, for the purpose of enhancing the crystallinity of the obtained polyethylene terephthalate resin, various well-known crystal nucleating agents may be added individually or in combination of two or more at the time of polymerization.

The polyethylene terephthalate resin produced as described above usually has an intrinsic viscosity of 0.35 to 1.20 [phenol / 1,1,2,2-tetrachloroethane = 50/50 (weight ratio), 0.5% (weight ratio, the same applies hereinafter), 25 ° C., and so on], but from the viewpoint of the balance between the crystallization rate and the mechanical strength, an intrinsic viscosity of 0.40 to 0.95. Preferred is 0.50
Further, those of up to 0.90 are more preferable. If it is less than 0.35, the mechanical strength is lowered, and if it exceeds 1.20, the fluidity is lowered.

The epoxy compound (B) used in the present invention having at least two epoxy groups in the molecule and having no ester bond in the molecule is, for example, synthesized by the reaction of bisphenol A with epichlorohydrin or the like. Bisphenol A type epoxy resin, bisphenol F type epoxy resin synthesized by similar reaction, novolak type epoxy resin synthesized by reaction of novolak resin and epichlorohydrin, etc., polyvalent aliphatic, alicyclic, aromatic alcohol A glycidyl ether compound synthesized by the reaction of chlorohydrin with epichlorohydrin, an epoxy compound obtained by epoxidizing an aliphatic or alicyclic compound having a plurality of unsaturated groups with acetic acid and peracetic acid, a polyvalent aliphatic, alicyclic, aromatic Synthesized by Reaction of Group Amine with Epichlorohydrin Triethanolamine compounds, epoxy compounds and the like which are synthesized by the reaction of a compound having a plurality of nitrogen-containing hetero ring and epichlorohydrin.

When the number of epoxy groups contained in the molecule of the epoxy compound is less than 2, the effect of improving the wet heat resistance of the obtained resin is hardly recognized. Further, when the epoxy compound has an ester bond in the molecule, the epoxy compound itself is inferior in moist heat resistance, so that the obtained resin is inferior in moist heat resistance, and a transesterification reaction with a polyethylene terephthalate-based resin during molding is performed. May cause side reactions.

Specific examples of these epoxy compounds include:
Denacol EM-12, an epoxy resin known by trade names such as Epicoat 828, Epicoat 1001, Epicoat 152 (all manufactured by Yuka Shell Epoxy Co., Ltd.).
5, Denacol EX-1101, Denacol EX-11
02, Denacol EX-1103 (both manufactured by Nagase Kasei Co., Ltd.) and other known epoxy emulsions, ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, tetramethylene glycol diglycidyl ether, neopentyl glycol diglycidyl ether. , Alkylene glycol diglycidyl ether such as 1,6-hexanediol diglycidyl ether, polyethylene glycol diglycidyl ether, polybutanediol diglycidyl ether,
Polyalkylene glycol diglycidyl ether such as polypropylene glycol diglycidyl ether, polyneopentyl glycol diglycidyl ether, polytetramethylene glycol diglycidyl ether, resorcin diglycidyl ether, erythritol polyglycidyl ether, trimethylolpropane polyglycidyl ether, pentaerythritol Polyglycidyl ether,
Hydroquinone diglycidyl ether, diglycerol polyglycidyl ether, polyglycerol polyglycidyl ether, sorbitan polyglycidyl ether, sorbitol polyglycidyl ether, bisphenol S diglycidyl ether, diglycidyl aniline, tetraglycidyl 4,4′-diaminodiphenylmethane, triglycidyl tris (2-hydroxyethyl) isocyanurate etc. are mentioned. These may be used alone or in combination of two or more.

(B) The amount of the epoxy compound used is (A)
The amount is 0.05 to 30 parts by weight, preferably 0.1 to 20 parts by weight, and more preferably 0.15 to 10 parts by weight with respect to 100 parts by weight of the polyethylene terephthalate resin.
When the amount of the epoxy compound (B) is less than 0.05 parts by weight, the effect of improving the mechanical strength and the resistance to moist heat of the obtained molded article is small, and when it exceeds 30 parts by weight, the fluidity of the obtained composition is low. Drastically reduced.

The epoxy equivalent of the epoxy compound (B) is
Preferably 700 or less, more preferably 500 or less,
It is particularly preferably 300 or less. Epoxy equivalent is 70
When it exceeds 0, the wet heat resistance is deteriorated, which is not preferable.

The (C) fibrous reinforcing agent used in the present invention is preferably glass fiber, carbon fiber or the like having a diameter of 1 to 20 μm and a length of 0.05 to 50 mm, which may be used alone or in combination of two or more kinds. Used. From the viewpoint of workability, it is preferable to use chopped strand glass fibers treated with a sizing agent. Further, in order to enhance the adhesiveness between the resin and the fibrous reinforcing agent, it is preferable that the surface of the fibrous reinforcing agent is treated with a coupling agent, and a binder may be used.

Examples of the coupling agent include γ-
Alkoxysilane compounds such as aminopropyltriethoxysilane and γ-glycidoxypropyltrimethoxysilane, and as the binder, for example, epoxy resin,
Urethane resins and the like are preferably used, but not limited thereto. These may be used alone or in combination of two or more.

The amount of the fibrous reinforcing agent (C) used is 2-150 parts by weight, preferably 5-135 parts by weight, based on 100 parts by weight of the polyethylene terephthalate resin (A).
More preferably, it is 10 to 120 parts by weight. When the amount of the fibrous reinforcing agent (C) used exceeds 150 parts by weight, the moldability is poor, and the heat and heat generated during the molding process are so intense that decomposition and deterioration of the resin are promoted. The obtained resin has a poor crystallization rate and insufficient mechanical strength.

Examples of the (D) inorganic nucleating agent used in the present invention include talc, mica, wollastonite, clay,
Kaolin, diatomaceous earth, bentonite, montmorillonite,
Inorganic fine powdery reinforcing agents such as hydrotalcite, calcium carbonate, titanium oxide, potassium titanate, asbestos and barium sulfate are preferably used. Among them, a nucleating agent containing silicon dioxide is preferable because it has an excellent effect as a nucleating agent. These inorganic nucleating agents may be used alone or in combination of two or more. In addition, these can be added at any time such as polymerization and melt-kneading. Further, if a commonly used nucleating agent other than inorganic, such as an organic carboxylic acid metal salt, is used, the wet heat resistance and fluidity of the obtained resin are significantly reduced.

The amount of the (D) inorganic nucleating agent used in the present invention is (A) polyethylene terephthalate resin 100.
The amount is 0.01 to 50 parts by weight, preferably 0.1 to 30 parts by weight, and more preferably 0.5 to 25 parts by weight. If the amount of the inorganic nucleating agent (D) added is less than 0.01 part by weight, the effect of improving the crystallization rate is poor, and if it exceeds 50 parts by weight, the mechanical strength and fluidity are reduced and the wet heat resistance is reduced. Sometimes.

In the composition of the present invention, any other thermoplastic or thermosetting resin within the range not impairing the present invention, for example, saturated or unsaturated polyester resin other than polyethylene terephthalate resin, liquid crystal polyester. -Based resin, polyester ester elastomer-based resin, polyester ether elastomer-based resin, polyolefin-based resin, polyamide-based resin, polycarbonate-based resin, rubbery polymer reinforced styrene-based resin, polyphenylene sulfide-based resin, polyphenylene ether-based resin, polyacetal-based resin, You may add polysulfone type resin, polyarylate type resin, etc. individually or in combination of 2 or more types.

In order to improve the performance of the resin composition of the present invention, antioxidants such as phenolic antioxidants and thioether antioxidants, heat stabilizers such as phosphorus stabilizers, etc. are used alone. Alternatively, it is preferable to use two or more kinds in combination. Further, if necessary, a well-known stabilizer, lubricant, mold release agent, plasticizer, flame retardant, flame retardant aid, ultraviolet absorber, light stabilizer, pigment, dye, antistatic agent, conductive agent, etc. Additives, dispersants, compatibilizers, antibacterial agents, additives such as epoxy group reaction catalysts can be used alone or in combination of two or more.

The method for producing the polyethylene terephthalate resin of the present invention is not particularly limited. For example, the components (A) to (D), other additives, resins, etc. are dried and then melt-kneaded in a melt-kneader such as a single-screw or twin-screw extruder. You can

The molding method of the thermoplastic resin composition of the present invention is not particularly limited, and molding methods generally used for thermoplastic resins, that is, injection molding, blow molding, extrusion molding, sheet molding and rolls are used. Molding methods such as molding, press molding, laminated molding, film molding by a melt casting method, and spinning can be applied.

[0027]

EXAMPLES Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited thereto. In the following, "parts" means parts by weight and "%" means% by weight unless otherwise specified.

Example 1 (A1) Polyethylene terephthalate was polymerized. That is, 1.8 times the molar amount of ethylene glycol with respect to dimethyl terephthalate was added and stirred, and then magnesium acetate tetrahydrate 0.06 was added to 100 parts of the polyester produced.
Part and polymerization reaction catalyst germanium dioxide 0.02
Parts were added. After raising the temperature to 250 ° C., transesterification is carried out under normal pressure to obtain a low polymer, which is further added with 0.0 over 1 hour.
A polyethylene terephthalate resin having an intrinsic viscosity of 0.60 was obtained by reducing the pressure to 3 Torr and increasing the temperature to 280 ° C. and polymerizing for 2 hours, and this was used. As the epoxy compound (B1), Epicoat 828 (epoxy equivalent: 185) manufactured by Yuka Shell Epoxy Co., Ltd., which is a bisphenol A type epoxy resin, was used. (D1) As a nucleating agent, talc manufactured by Nippon Talc Co., Ltd., Microace K-1 was used. (A1) 63.0%, (B1) 1.5%, (D1) 5%
Adeka Stab AO-60 manufactured by Asahi Denka Co., Ltd. was further added as a hindered phenol antioxidant.
Asahi Denka Co., Ltd., ADEKA STAB AO-412S 0.2% was added as a thioether stabilizer at 3%, and after stirring with a super mixer, manufactured by Japan Steel Works, Ltd.,
TEX44 Vent twin screw extruder, barrel temperature 26
The temperature was set to 0 ° C, and the mixture was charged from the hopper. Further, from the side feeder of the extruder, as a (C1) fibrous reinforcing agent, T-195H / PS manufactured by Nippon Electric Glass Co., Ltd. was used.
A resin composition was obtained by adding 0.0% and performing melt extrusion.

Examples 2 to 14 (A2) Polyethylene terephthalate was polymerized by the same polymerization method as in (A1) to obtain a polyethylene terephthalate resin having an intrinsic viscosity of 0.75. (B2) Denacol EX-920 (Epoxy equivalent: 18) manufactured by Nagase Kasei Co., Ltd., which is polypropylene glycol diglycidyl ether as an epoxy compound.
0), (B3) as an epoxy compound, Octacresol novolac type epoxy resin, manufactured by Yuka Shell Epoxy Co., Ltd., Epicoat 180S65 (epoxy equivalent: 21)
0), (D2) As a nucleating agent, Talc manufactured by Fuji Talc Co., Ltd., L
MP-100, (D3) nucleating agent, Mica manufactured by Yamaguchi Mica Co., Ltd., A-21S, (D4) nucleating agent, NYCO
Wollastonite manufactured by NYAD325, (D5) as a nucleating agent, kaolin manufactured by Tsuchiya Kaolin Co., Ltd., Satinton N
o. 5 and the like were used, and a resin composition was obtained in the same manner as in Example 1 except that the mixing ratios shown in Table 1 were used.

Comparative Example 1 Polyethylene terephthalate resin was polymerized using antimony trioxide which is an antimony catalyst.
(A'1) Bellpet PBK-2 (intrinsic viscosity: 0.60) manufactured by Kanebo Co., Ltd. and the compounding agent used in Example 1 above were used, and the compounding ratio and compounding method were the same as in Example 1. A resin composition was obtained.

Comparative Examples 2 to 12 (B'1) As an epoxy compound, glycidyl methacrylate (Wako Pure Chemical Industries, Ltd. reagent epoxy equivalent, which is a compound having one epoxy group in the molecule and having an ester bond in the molecule) : 142), (B′2) epoxy compound is terephthalic acid diglycidyl ester,
Nagase Kasei Co., Ltd. Denacol EX-711 (epoxy equivalent: 149), (D'1) pt-butyl-sodium benzoate was used as the organic carboxylic acid metal salt nucleating agent, respectively. (A) (A ') (B) (B') (C)
A resin composition was obtained in the same manner as in Example 1 except that (D) and (D ′) shown in Table 2 were used and mixed in the proportions shown in Table 2.

The obtained resin composition was dried at 140 ° C. for 4 hours using a hot air dryer, and then molded at a cylinder temperature of 270 ° C. and a mold temperature of 120 ° C. using a 50t injection molding machine to give a test piece. It was obtained and subjected to physical property measurement by the following methods. The results are shown in Tables 1 and 2.

Moisture and heat resistance of the test piece was 121 ° C. and 100%.
After processing for 30 hours under the condition of RH, ASTM D-63
The maximum strength of the tensile test according to No. 8 was evaluated, and the retention rate (%) for the same sample before treatment was calculated and obtained.

The fluidity conforms to JIS K-7210,
The B method flow was measured at a preset temperature of 280 ° C. and a preheating time of 10 minutes (10 ⁻² cc / sec).

Regarding the crystallization rate, a sample for measurement was prepared by using about 5 mg of pellets after extrusion, and this was measured with a differential scanning calorimeter DSC-220C manufactured by Seiko Denshi Kogyo Co., Ltd. at a heating rate of 20 ° C./min. Increase the temperature from 23 ℃ to 290 ℃, and
After holding at 90 ° C. for 5 minutes to completely melt, the temperature was lowered from 290 ° C. to 23 ° C. at a temperature lowering rate of 20 ° C./min, and evaluation was performed by using the temperature falling crystallization temperature Tcc (° C.) measured during the temperature lowering. .

[0036]

[Table 1]

[0037]

[Table 2]

From the results of Tables 1 and 2, Comparative Examples 1 to 3
Since a polyethylene terephthalate-based resin polymerized with an antimony-based catalyst is used, the wet heat resistance and fluidity are inferior to those of the corresponding examples. Also, the crystallization rate tends to decrease. In Comparative Example 4, the epoxy compound (B) was not contained, so that the wet heat resistance was inferior. In Comparative Example 5, the (D) inorganic nucleating agent was not contained, so the crystallization rate was inferior. In Comparative Examples 6 and 7, the epoxy compound (B) is different from that of the present invention, so that Comparative Example 6 is inferior in wet heat resistance, and Comparative Example 7 is difficult to mold. Since the amount of the (B) epoxy compound in Comparative Example 8, the amount of the (C) fibrous reinforcing agent in Comparative Example 9, and the (D) inorganic nucleating agent in Comparative Example 10 are outside the scope of the present invention, respectively. In both cases, molding is difficult. Comparative Example 11
However, since (D) a nucleating agent different from that of the present invention is used, the wet heat resistance and fluidity are inferior. In Comparative Example 12, since the (C) fibrous reinforcing agent was not included, the crystallization rate was inferior and the mechanical strength was significantly reduced.

[0039]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, a polyethylene terephthalate resin composition which is excellent in wet heat resistance, fluidity and mechanical strength and has a high crystallization rate and which can be subjected to high cycle molding is provided. The resin composition of the present invention,
Even when it is used as a resin product for a long time under high temperature and high humidity, the mechanical strength is not significantly reduced, and it is industrially very useful.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location C08K 7/02 KKF C08K 7/02 KKF (72) Inventor Kazufumi Hirobe Kita-ku, Osaka City, Osaka Prefecture Honjo Nishi 3-chome 2-25- 307 (72) Inventor Kenji Mogami 5-5-31-102 Torikai Nishi, Settsu City, Osaka Prefecture (72) Inventor Hiroshi Koyama 1 of 9-41 Higashi Sonoda Town, Amagasaki City, Hyogo Prefecture

Claims (2)

[Claims] 1. A polyethylene terephthalate resin 1 having at least 80% of ethylene terephthalate repeating units polymerized using a germanium catalyst (A).
0.0 parts by weight of (B) an epoxy compound having at least two epoxy groups in the molecule and having no ester bond in the molecule 0.0
A polyethylene terephthalate-based resin composition containing 5 to 30 parts by weight, (C) 2 to 150 parts by weight of a fibrous reinforcing agent, and (D) 0.01 to 50 parts by weight of an inorganic nucleating agent. 2. The polyethylene terephthalate resin composition according to claim 1, wherein (B) an epoxy compound having at least two epoxy groups in the molecule and having no ester bond in the molecule has an epoxy equivalent of 700 or less. .