JPH03292348A - Reinforced thermoplastic resin composition - Google Patents

Abstract

PURPOSE:To improve moldability and resistance to impact, heat, and chemicals by compounding a specific graft copolymer compsn. with a polyester, an inorg. filler, and a crystallization accelerator. CONSTITUTION:90-15 pts.wt. monomer mixture comprising 50-90wt.% arom. vinyl, 9-50wt.% vinyl cyanide, and 0.001-15wt.% epoxidized vinyl monomer (e.g. glycidyl acrylate) is graft copolymerized in the presence of 10-85 pts.wt. diene rubber to give a graft copolymer, which is copolymerized with another monomer (e.g. acrylic acid) to give a graft copolymer compsn. 100 pts.wt. compsn. comprising 1-98 pts.wt. said graft copolymer or graft copolymer compsn., 1-98 pts.wt. polyester which has an intrinsic viscosity of 0.35dl/g or higher and in which terephthalic acid accounts for 50mol% or higher of the dicarboxylic acid component and ethylene glycol accounts for 50mol% or higher of the diol component, and 1-70 pts.wt. inorg. filler (e.g. a chopped strand glass fiber) is compounded with 0.01-5 pts.wt. crystallization accelerator (e.g. MgO).

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a reinforced thermoplastic resin composition having excellent impact resistance, heat resistance, moldability and chemical resistance.

<Prior Art> Polyethylene terephthalate (hereinafter abbreviated as PET) has excellent heat resistance, chemical resistance, and bulking properties, and is widely used as a fiber and film material. However, as a molding material, the crystallization rate is slower than that of polybutylene terephthalate resin, which requires high mold temperatures and long injection molding cycles, and the impact resistance of molded products, especially the impact resistance of notched It has the disadvantage of being inferior in quality, which limits its use.

Various attempts have been made to solve these problems. That is, for the purpose of promoting crystallization of PET, a method of adding an alkali metal salt of a higher fatty acid is disclosed in JP-A-56-139550 and JP-A-57-9004.
It has been proposed in Publication No. 0, etc.

Furthermore, as a method for improving the impact resistance of PET, blending it with glass fiber has been proposed in Japanese Patent Publication No. 44-457 and Japanese Patent Application Laid-open No. 46343-1983.

Furthermore, blends of PET, glass fibers and rubbery polymers are disclosed in, for example, JP-A-54-31456 and JP-A-5.
6-88458, JP-A-57-30753, and JP-A-59-138257, etc., there is a method of adding an epoxy compound to a blend of PET, glass fiber, and acrylic rubber polymer. This method has been proposed in Japanese Patent Application Laid-Open No. 57-170952.

<Problems to be Solved by the Invention> However, with the methods described above, it is extremely difficult to obtain a composition that fully satisfies all of moldability, impact resistance, and heat resistance.

For example, when an alkali metal salt of a higher fatty acid is added to PET, crystallization is promoted to some extent, but it is still not at a sufficient level. The impact strength of the molded product obtained is also low.

In the case of a blend of PET and glass fiber, the degree of impact strength improvement and crystallization promotion effect of PET is insufficient, and the molding shrinkage rate is anisotropic due to the orientation of the glass fibers in the molded product. Due to the increased stiffness, a problem arises in that warpage occurs in the molded product.

By blending the polymer into the rubber, the problem of warping can be considerably improved, but the impact strength is not at a fully satisfactory level, and the degree of crystallization of PET is also insufficient, making it difficult to achieve satisfactory heat resistance and chemical resistance. It is difficult to obtain.

When an epoxy compound is added, the epoxy compound is localized and hardened, resulting in essentially poor fluidity.

The object of the present invention is to create a resin composition that promotes crystallization of PET, improves poor moldability and low impact resistance, and has excellent heat resistance, chemical resistance, mechanical properties, and moldability. Our goal is to provide the following.

Means for Solving the Problems〉 That is, the present invention provides (A) (a) diene rubber 10 to
85 parts by weight, (b) (i) 50 to 90% by weight of aromatic vinyl, (b) 9 to 50% by weight of vinyl cyanide, and (
c) Vinyl monomer containing epoxy group 0.001~
A graft copolymer obtained by graft copolymerizing 90 to 15 parts by weight of a monomer mixture containing 15% by weight, or a kraft copolymer obtained by copolymerizing the graft copolymer with the remaining monomer. 1 to 98 parts by weight of a combined composition, (B) 1 to 98 parts by weight of a polyester in which 50 mol% or more of the dicarboxylic acid component is terephthalic acid and 50 mol% or more of the diol component is ethylene glycol, (C) an inorganic filler. For 100 parts by weight of a composition consisting of 1 to 70 parts by weight of
D) A reinforced thermoplastic resin composition containing 0.01 to 5 parts by weight of a crystallization promoter.

The feature of the present invention is that as a graft component of diene rubber,
A graft copolymer (composition) obtained by graft copolymerizing essential components of aromatic vinyl, vinyl cyanide, and a vinyl monomer having an epoxy group, with terephthalic acid as the main acid component, and ethylene glycol as the main glycol component. It is a blend of polyester, inorganic filler, and crystallization accelerator.

By blending a graft copolymer, a resin composition with excellent impact resistance can be obtained, and by blending a permanent filler, it can be used as a reinforcing material, a surface modifier, or to improve electrical, thermal, and other properties. A reforming effect can be obtained. Furthermore, together with the effect of a crystallization accelerator, these promote the crystallization of a polyester containing terephthalic acid as the main acid component and ethylene glycol as the main diol component, thereby imparting excellent heat resistance and chemical resistance.

The present invention will be specifically explained below.

The kraft copolymer or graft copolymer composition (A) used in the present invention consists of 10 to 85 parts by weight of the diene rubber (a) and aromatic vinyl added to the total of (a) and (b) as 100 parts by weight. (b) 50 to 90% by weight, vinyl cyanide (b) 9 to 50% by weight, and a vinyl yarn weighter containing an epoxy group (c) 0°001 to 15% by weight. Monomer mixture (b) A graft copolymer obtained by graft copolymerizing a total amount of 15 to 90 parts by weight, or a graft copolymer obtained by graft copolymerizing a part of the monomer mixture and the remaining monomers. This is a graft copolymer composition with a copolymer obtained by copolymerizing. In this case, it is possible to graft-copolymerize the entire vinyl monomer having an epoxy group, or it can be divided into a graft copolymer and a copolymer obtained by copolymerizing the remaining monomers. Alternatively, the entire amount can be copolymerized to form a copolymer with the remaining monomers.

What is important in the present invention is that in the graft copolymer or graft copolymer composition (A), aromatic vinyl (a),
Using a graft copolymer obtained by graft copolymerizing a monomer mixture (b) that essentially includes vinyl cyanide (b) and a vinyl monomer containing an epoxy group (c) to a diene rubber (a). It is.

Examples of the diene rubber in the present invention include polybutadiene rubber, acrylonitrile-butadiene copolymer rubber, styrene-butadiene copolymer rubber, and polyisoprene rubber, among which polybutadiene rubber, styrene-butadiene copolymer rubber,
Butadiene copolymer rubber and the like are preferred.

Examples of the aromatic vinyl in the monomer mixture (b) in the present invention include styrene, α-methylstyrene, p-methylstyrene, pt-butylstyrene, etc. Among them, styrene, α-methylstyrene, etc. is preferred.

Examples of the vinyl cyanide monomer (b) in the monomer mixture (b) in the present invention include acrylonitrile and methacrylonitrile, with acrylonitrile being preferred.

The vinyl monomer (c) containing an epoxy group is a compound that shares both a radically polymerizable vinyl group and an epoxy group in one molecule, and specific examples include glycidyl acrylate, glycidyl methacrylate, and ethacrylate. Examples include glycidyl esters of unsaturated organic acids such as glycidyl acid and glycidyl itaconate, glycidyl ethers such as allyl glycidyl ether, and the above-mentioned derivatives such as 2-methylglycidyl methacrylate. Among them, glycidyl acrylate and methacrylic acid Glycidyl can be preferably used. Moreover, these can be used alone or in combination of two or more.

It is also possible to graft-copolymerize other copolymerizable monomers in an amount of 70 parts by weight or less with respect to a total of 100 parts by weight of monomers (a), (b), and (c). be.

Other copolymerizable monomers include α,β-unsaturated carboxylic acids such as acrylic acid and methacrylic acid, α, such as methyl methacrylate, ethyl methacrylate, a-t-butyl methacrylate, and cyclohexyl methacrylate. α of β-unsaturated carboxylic acid esters, maleic anhydride, itaconic anhydride, α of β-unsaturated carboxylic acid anhydrides, N-phenylmaleimide, N-methylmaleimide, N-t-butylmaleimide, etc. Examples include imide compounds of β-unsaturated dicarboxylic acids.

Graft copolymer or graft copolymer composition (A)
The composition ratio of diene rubber (a) in (a) and (b) is
It is 10 to 85 parts by weight, preferably 12 to 80 parts by weight, particularly preferably 15 to 70 parts by weight, based on the total of 100 parts by weight.

In addition, the respective composition ratios of aromatic vinyl (a), vinyl cyanide (b), and vinyl monomer containing an epoxy group (c) in the monomer mixture (b) in the present invention are (a) is 50
-90% by weight, preferably 55-85% by weight, particularly preferably 57-82% by weight, 9-50% by weight of (B), preferably 15-45% by weight, particularly preferably 18-43% by weight
Weight%.

(iii) is used in a range of 0.001 to 15% by weight, preferably 0.501 to 12% by weight, particularly preferably 0.1 to 10% by weight.

(a) is 1 part by weight per 100 parts by weight of (a> and (b))
If the amount is less than 0 parts by weight, if (a) exceeds 90% by weight relative to the total of (a), (b), and (c), and if (b) is less than 9% by weight, It is not preferable because the impact resistance of the resulting composition is low, and (a) is not preferable because (a) and (
If it exceeds 85 parts by weight based on the total of 100 parts by weight of b), and the total of (a), (b), and (c) is 100% by weight
When (a) is less than 50% by weight and when (b) is more than 50% by weight, it is not practical because the molding processability of the resulting composition is poor; oo
i wt % ungrooved, the resulting composition has low impact resistance;
If it exceeds 5% by weight, a crosslinking reaction tends to occur during the production of (A), making it difficult to obtain a product of constant quality, which is not practical.

Graft copolymer or graft copolymer composition (A)
There are no particular restrictions on the manufacturing method, and commonly known methods such as bulk polymerization, solution polymerization, bulk suspension polymerization, suspension polymerization, and emulsion polymerization can be used. There are no particular restrictions on the method of charging the monomers; they may be added all at once at the initial stage, or part or all of the monomers may be continuously charged or divided in order to prevent the formation of a compositional distribution of the copolymer. Polymerization may be carried out during the preparation.

It is also possible to obtain the above compositions by blending separately (graft) copolymerized resins.

The polyester (B) used in the present invention contains a dicarboxylic acid component in which 50 mol% or more, preferably 80 mol% or more is terephthalic acid, and a diol component in which 50 mol% or more, preferably 80 mol% or more is ethylene glycol. It is a polymer obtained by polycondensation. Examples of the terephthalic acid component here include terephthalic acid and ester-forming derivatives thereof, and examples of the ethylene glycol component include ethylene glycol and ester-forming derivatives thereof.

Other dicarboxylic acid components used with the terephthalic acid component include isophthalic acid, orthophthalic acid, 2,6-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, bis(p-carboxyphenyl)methaneandhracene carboxylic acid, 4゜4--diphenyldicarboxylic acid,
Aromatic dicarboxylic acids such as 1,2-bis(phenoxy)ethane-4,4-dicarboxylic acid and 5-sodium sulfoisophthalic acid; alicyclic acids such as 1,3-cyclohexanedicarboxylic acid and 1,4-cyclohexanedicarboxylic acid; Formula dicarboxylic acid, adipic acid, sebacic acid, azelaic acid,
Examples include aliphatic dicarboxylic acids such as decanedioic acid, dodecanedioic acid, hexadecanedioic acid, octadodecanedioic acid, and dimer acid, and ester-forming derivatives thereof.

In addition, examples of diol components used together with the ethylene glycol component include aliphatic glycols having 2 to 20 carbon atoms, such as propylene glycol, 1°4-butanediol, neopentyl glycol, 1.5-bentanediol, and 1.6-hexanediol. , decamethylene glycol, cyclohexane diol, cyclohexane diol, etc., or long chain diols with a molecular weight of 400 to 6,000, i.e., polyethylene glycol, poly 1.3
-Propylene glycol, polytetramethylene glycol, etc. and ester-forming derivatives thereof.

Specific examples of these polymers include polyethylene terephthalate, polyethylene terephthalate/isophthalate, polyethylene terephthalate/adipate, polyethylene terephthalate/sebacate, polyethylene terephthalate/decanedicarboxylate, polyethylene/butylene terephthalate, and polyethylene/butylene. Examples include polyethylene terephthalate copolymers such as terephthalate/decanedicarboxylate and polyethylene/polyoxyethylene terephthalate, with polyethylene terephthalate being preferably used.

In addition, these polyesters have an intrinsic viscosity of 0.35 dj/+r or more from the viewpoint of mechanical properties, and 2.
．． Qdj, /g or less is preferable, and in particular, 0.50 to 1.35 dJ/t is preferable.

Furthermore, generally known methods can be employed for producing these polyesters. In other words, in order to achieve the desired degree of polymerization and polymerization rate, a method in which dicarboxylic acid and diol are heated and melt-polymerized in the presence of a transition metal touch is recommended. It is also possible to replace it with a derivative.

Next, as the inorganic filler (C) used in the present invention, fibrous fillers such as glass fibers (including those whose surface is treated with a silane coupling agent), carbon fibers, metal fibers, asbestos, ceramic fibers, and organic fibers are used. Powdered, granular, or plate-like inorganic fillers such as powder, talc, silica, mica, glass peas, crow flakes, clay, alastonite, and calcium carbonate can be mentioned. Among them, chopped strand type glass fiber is most preferably used.

As the crystallization promoter (D) used in the present invention, a wide variety of compounds can be used, including organic acid metal salts commonly used as crystal nucleating agents for polyester.

Specifically, oxides of metals from Group 1 of the Periodic Table of the Elements, such as magnesium oxide, sulfates, such as zinc sulfate, acetates, such as calcium acetate, stearates, such as barium stearate, benzoates, such as Examples include calcium benzoate, oxalates such as calcium oxalate, and tartrates such as magnesium tartrate. In addition, titanium dioxide, sodium benzoate, lithium terephthalate, sodium stearate, sodium acetate,
Potassium benzoate, metal organic sulfonates such as sodium styrene sulfonate, metal or metal glycols of alkaline earth metals, titanium, germanium, antimony, tungsten, mankan, sodium, lithium or barium salts of mono- or polycarboxylic acids, α −
Examples include ionic copolymers consisting of olefins and α,β-unsaturated carboxylates.

In the reinforced thermoplastic resin composition of the present invention, the blending ratio of the graft copolymer or graft copolymer composition (A), polyester<B), and inorganic filler (C) is (A
) is 1 to 98 parts by weight, preferably 2 to 90 parts by weight, particularly preferably 5 to 85 parts by weight - (B) is 1 to 98 parts by weight,
Preferably 2 to 90 parts by weight, particularly preferably 5 to 85 parts by weight, and (C) 1 to 70 parts by weight, preferably 5 to 85 parts by weight.
The proportion is 65 parts by weight, particularly preferably 10 to 60 parts by weight, and the total amount of (A), (B) and (C) is 100 parts by weight. (A) is less than 1 part by weight, (B) is 98
If (C) exceeds 98 parts by weight, and if (C) exceeds 1 part by weight or exceeds 70 parts by weight, the resulting composition will have poor moldability and impact resistance, and if (A) exceeds 98 parts by weight, If (B) is less than 1 part by weight, it is not preferable because the chemical resistance of the composition will be poor, and the amount of crystallization promoter (D) added is 100 parts by weight in total of the above (A) to (C). For 00
It is 1 to 5 parts by weight, preferably 0.1 to 3 parts by weight, particularly preferably 0.1 to 2 parts by weight. If (D) is less than 0.01 parts by weight, the heat resistance of the composition is poor; ) exceeds 5 parts by weight, which is not preferred because the impact resistance of the composition will be poor.

Although there is no particular restriction on the content of the vinyl monomer (iii) residue containing an epoxy group in the reinforced thermoplastic resin composition of the present invention, from the viewpoint of impact resistance and fluidity of the composition, usually,
The copolymerization amount and reinforcement of (c) in the kraft copolymer or graft copolymer composition (A) so that it is in the range of 0.00015 to 11.2% by weight, particularly 0.01 to 5% by weight. It is preferable to adjust the blending amount of (A) in the thermoplastic resin composition.

There are no particular limitations on the method for producing the reinforced thermoplastic resin composition of the present invention, and generally known methods can be employed.

That is, the graft copolymer or graft copolymer composition (A), polyester (B), inorganic filler (C), and crystallization promoter (D) are mixed in the form of pellets, powder, strips, etc. using a high-speed stirrer. A variety of methods are adopted, including a method in which the mixture is homogeneously mixed using a screwdriver, etc., and then melt-kneaded in a single-screw or multi-screw extruder with sufficient kneading capacity, and a method in which it is melt-kneaded using a Banbury mixer or a rubber roll machine. be able to.

The reinforced thermoplastic resin composition of the present invention has the above-mentioned (A), (
In addition to B), (C) and (D), polystyrene (PS) + styrene/acrylonitrile copolymer (SAN), polymethyl methacrylate (PMMA),
Styrene/methyl methacrylate/acrylonitrile copolymer, α-methylstyrene/acrylonitrile copolymer, α-methylstyrene/styrene/acrylonitrile copolymer, α-methylstyrene/methyl methacrylate/acrylonitrile copolymer, p-methyl Vinyl polymers such as styrene/acrylonitrile copolymer, styrene/N-phenylmaleimide copolymer, methyl methacrylate-
Butadiene-styrene terpolymer (MBS>resin, A
ES resin, AASI resin, polycarbonate, polycaproamide (nylon 6), polyhexamethylene adipamide (nylon 66) and other thermoplastic resins may be appropriately mixed, or polyethylene, polypropylene, ethylene/propylene copolymer, ethylene/butene -1 copolymer, ethylene/propylene/dicyclopentadiene copolymer, ethylene/propylene 15-ethylidene 2-norbornene copolymer, ethylene/vinyl acetate copolymer and ethylene/vinyl acetate copolymer.
By appropriately mixing polyolefin rubber such as butyl acrylate copolymer, it is also possible to adjust the physical properties and characteristics to more desirable properties.

Further, depending on the purpose, pigments, dyes, heat stabilizers, antioxidants, ultraviolet absorbers, light stabilizers, lubricants, plasticizers, antistatic agents, flame release agents, and the like can be added.

The essential monomers (a), (b), and (c) in the present invention can be simply blended as a copolymer without graft copolymerization to obtain almost the same effect as the present invention, but graft copolymerization By doing so, it is possible to reduce the copolymerization amount of the vinyl monomer containing an epoxy group, and the moldability can be significantly improved.

<Examples> Hereinafter, the present invention will be explained in more detail with reference to Examples and Comparative Examples.

As an evaluation of moldability, moldability in an 80°C mold was measured.

As an evaluation of impact resistance, 1/2” Izotsu impact strength was A.
Measured according to STM D256-56.

HDT is A as an evaluation of heat distortion temperature, which is a measure of heat resistance.
STM D648-56, VSPT is ASTM
Measured according to D-1525.

Chemical resistance was determined by visually observing the surface of a square plate injection-molded in an 80°C mold by immersing it in methanol and gasoline at 23°C for 124 hours.

Note that the following parts and percentages represent parts by weight and percentages by weight, respectively.

Reference Example 1 Graft copolymers A-1 to A4 were manufactured according to the following formulations.

A-1: Polybutadiene latex (rubber particle size 0.2
5JJ, gel content 80%) 60 parts (in the presence of solid conversion X>, styrene 73.8%, acrylonitrile 26%,
40 parts by weight of a monomer mixture containing 0.2% glycidyl methacrylate was subjected to emulsion polymerization.

The obtained graft copolymer was coagulated with magnesium sulfate, washed, filtered, and dried to prepare a powdery graft copolymer (A-1).

A-2: Polybutadiene latex 4 used in A-1
1 part of methyl methacrylate in the presence of 0 parts (based on solid content)
After emulsion polymerizing 60 parts by weight of a monomer mixture consisting of 3% styrene, 70% styrene, 15% acrylonitrile, and 2% glycidyl acrylate, a powdery graft copolymer (A-2) was prepared in the same manner as A-1. was prepared.

Polybutadiene latex 5 used in A-3 + A-1
After emulsion polymerizing 50 parts by weight of a monomer mixture consisting of 95% styrene and 5% glycidyl methacrylate in the presence of 0 parts (in terms of solid content), a powdery graft copolymer was obtained in the same manner as A-1. (A3) was prepared.

A-4: After emulsion polymerization of 40 parts by weight of a monomer mixture consisting of 75% styrene and 25% acrylonitrile in the presence of 60 parts of polybutadiene latte ylas used in A-1 (solid replacement A powdery graft copolymer (A-4) was prepared in the same manner as A-1.

Reference Example 2 The following two types of polyethylene terephthalate were used as the polyester (B).

B-1: PET-JO25 (Mitsui Bet Resin Co., Ltd.)
B-2: PET-J135 (manufactured by Mitsui Pet Resin Co., Ltd.) Reference Example 3 The following two types were used as the inorganic filler (C).

C-1 = Epoxy-treated 3++n+ chopped strand type glass fiber C-2 = Liumium titanate whisker Reference Example 4 The following two types were used as the crystallization accelerator (D).

D-1 = barium stearate D-2 = sodium acetate Examples 1 to 8 A-1 to A-2 produced in Reference Example 1, PET of Reference Example 2
, the inorganic filler of Reference Example 3, and the crystallization accelerator of Reference Example 4 were mixed in a Henschel mixer in the proportions shown in Table 1, and then extruded using a 40 mmφ extruder at an extrusion temperature of 260°C, and pelletized. , molding temperature 260°C, mold temperature 80°C, molding cycle injection 1 for each pellet.
Each test piece was prepared by injection molding under the conditions of 0 seconds and cooling for 40 seconds, and its physical properties were evaluated. These results are shown in Table-1.

Comparative Examples 1 to 9 A-1 to A-4 manufactured in Reference Example 1, PET of Reference Example 2
, the inorganic filler of Reference Example 3, and the crystallization promoter of Reference Example 4 were prepared in the same manner as in Example 1 using the blending ratios shown in Table 1, and the physical properties thereof were evaluated. These results are also shown in Table-1.

The following is clear from the Examples and Comparative Examples.

That is, all of the products obtained according to the present invention are excellent in moldability, impact resistance, heat resistance, and chemical resistance. On the other hand, if the crystallization accelerator is outside the specified range, the heat resistance or impact resistance will be poor. If the inorganic filler is outside the specified range, moldability will be poor and the resulting composition will also have poor impact resistance and heat resistance. Craft copolymer (A-4) that does not copolymerize vinyl monomers containing epoxy groups
In addition, a kraft copolymer (A3) in which only an aromatic vinyl that does not contain vinyl cyanide and a vinyl photopolymer containing an epoxy group are grafted as graft components has insufficient impact resistance due to insufficient compatibility with PET. is insufficient.

If the kraft copolymer is not contained, molding is impossible, and if the content of the graft copolymer is too large, there are problems such as poor chemical resistance.

<Effects of the Invention> The reinforced thermoplastic resin composition of the present invention is a kraft copolymer or graft copolymer composition <A> polyester (
B), the inorganic filler (C) and the crystallization accelerator (D) are blended in a specific ratio, or the dispersibility of the components (A) to (D) is good, especially due to the presence of epoxy groups. . Furthermore, the poor moldability and low heat resistance caused by the slow crystallization rate of polyester (B) have been improved, and it can be used as a molding material that takes advantage of polyester's heat resistance, chemical resistance, and rigidity. It can be used for various purposes.

Claims (2)

[Claims] (1) (A) (a) 10 to 85 parts by weight of diene rubber,
(b) Consisting of (i) 50 to 90% by weight of aromatic vinyl, (b) 9 to 50% by weight of vinyl cyanide, and (c) 0.001 to 15% by weight of vinyl monomer containing an epoxy group. Graft copolymer compositions 1 to 1 consisting of a graft copolymer obtained by graft copolymerizing 90 to 15 parts by weight of a monomer mixture or a copolymer obtained by copolymerizing the graft copolymer and the remaining monomers. 98 parts by weight, (B) 1 to 98 parts by weight of a polyester in which 50 mol% or more of the dicarboxylic acid component is terephthalic acid and 50 mol% or more of the diol component is ethylene glycol, (C) 1 to 70 parts by weight of an inorganic filler A reinforced thermoplastic resin composition in which 0.01 to 5 parts by weight of a crystallization promoter (D) is added to 100 parts by weight of the composition. (2) The reinforced thermoplastic resin composition according to claim (1), wherein the crystallization promoter (D) is an organic acid metal salt.