JP3332401B2 - Resin composition for blow molding and hollow molded article thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester resin composition suitable for blow molding, and to a hollow molded article formed by a blow molding method using this composition.

[0002]

2. Description of the Related Art Thermoplastic polyester resins and polyamide resins have excellent mechanical strength, heat resistance, chemical resistance, electrical properties, etc. in a well-balanced manner and are widely used as representative engineering plastics. Although they have been used, most of them have been limited to those obtained exclusively by injection molding. However, in recent years, the use of polyester-based resins or polyamide-based resins has also become more sophisticated and specialized, and it has been expected that blow molding can be used to efficiently and economically form hollow molded articles. I have. For example, pipes and tanks in an automobile engine room are used in a high-temperature atmosphere,
In addition, since high mechanical properties are also required, metal fields are conventionally used exclusively.However, in order to reduce weight, prevent rust, reduce processing costs, etc., these are used as described above. It is desired to obtain a thermoplastic resin having excellent properties by blow molding. However, polyester resin or polyamide resin is generally the most important property in applying these processing methods, that is, since the melt tension is low, the drawdown is severe, and a molded article having a desired shape is obtained by a blow molding method. It is difficult. As this improvement method, a method using a high-polymerization degree polyester resin or polyamide resin having a high intrinsic viscosity, a method using a branched polyester or polyamide, a method of further adding a filler, and the like are considered. And are insufficient as materials for these processing methods. For polyester resins, a method has been proposed in which a branching agent such as an isocyanate compound or an epoxy compound is blended with the polyester resin to improve the melt tension and improve the drawdown property, but the effect is sufficient. In addition, the moldability is unstable, and it is difficult to obtain a uniformly good molded product. Also, a method has been proposed in which a copolymer of ethylene and an α, β-unsaturated glycidyl ester is blended with a polyester resin to improve the melt tension and improve the blow moldability. It is known that the combined use of compounds is more effective,
According to the study of the present inventors, it is necessary to blend such an ethylene-based glycidyl group-containing copolymer in a relatively large amount, and it is recognized that the effect of improving the melt tension and drawdown resistance to some extent is recognized, but is still sufficient However, especially when a trivalent phosphorus compound is used, the melt viscosity is significantly increased and the improvement in melt tension is small for the increase in viscosity. Was found to be poor and unstable, and had problems such as local gelation and deterioration of the surface condition of the molded article due to the gel-like material. The present inventors have found that the use of a specific styrenic copolymer in combination is effective as a method of improving the melt tension and drawdown resistance of such a polyester resin,
As proposed in Japanese Patent Application No. Hei 3-275477, such a composition is easily gelled, and if sufficient melt tension is obtained, it tends to gel and it is difficult to obtain stable fluidity. There was still a problem to do.

[0003]

Means for Solving the Problems The present inventors have made further improvements, and in particular, have obtained a melt pressure and drawdown resistance sufficient for blow molding, and a large hollow while maintaining stable fluidity. As a result of investigations to obtain a resin composition for blow molding capable of efficiently molding a molded article, the present invention has been reached. That is, the present invention provides: (A) 1 to 99 parts by weight of a thermoplastic polyester resin mainly comprising an aromatic dicarboxylic acid or an ester-forming derivative thereof and an aliphatic dihydroxy compound having 2 to 8 carbon atoms; (C) 40 to 97% by weight of styrene, 60 to 3% by weight of glycidyl ester of α, β-unsaturated acid, acrylonitrile, vinyl chloride , based on 100 parts by weight of a resin component comprising 99 to 1 part by weight of a polyamide resin.
Cycloalkenyl, alpha-methyl styrene, brominated styrene Ren, phenylene
0.2 to 10 parts by weight of a styrene copolymer comprising 0 to 50% by weight of a vinyl monomer selected from lumaleimide ; and (D) at least one of fibrous, powdery, and granular fillers in an amount of 0 to 100 parts by weight. A resin composition for blow molding obtained by melt-kneading, and a hollow molded article produced by blow molding using the resin composition.

Hereinafter, the components of the composition of the present invention will be described in detail. First, the thermoplastic polyester resin (A) used in the present invention is a polyester obtained mainly by the polycondensation of an aromatic dicarboxylic acid compound and an aliphatic dihydroxy compound having 2 to 8 carbon atoms. Any of them may be used.
Here, examples of the aromatic dicarboxylic acid compound constituting the thermoplastic polyester resin (A) include known aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, and diphenyldicarboxylic acid, and ester forming properties thereof. One or more selected from derivatives are mentioned. Among them, those mainly composed of terephthalic acid or its ester-forming derivative are preferred. Examples of the aliphatic dihydroxy compound having 2 to 8 carbon atoms, which is the other main component constituting the polyester (A) of the present invention, include ethylene glycol, propylene glycol, butanediol, neopentyl glycol, and hexanediol. , Cyclohexanediol, cyclohexanedimethanol,
Examples thereof include aliphatic dihydroxy compounds such as diethylene glycol and triethylene glycol, and substituted products thereof, and one or more of them can be used in combination. Among them, those mainly containing an aliphatic dihydroxy compound having 2 to 4 carbon atoms are preferable. In addition, as comonomer components other than those described above to constitute the copolyester, diphenyl ether dicarboxylic acid, α, β-bis (4-carboxyphenoxy) ethane, adipic acid, sebacic acid, azelaic acid, decanedicarboxylic acid, dodecanedicarboxylic acid,
Cyclohexanedicarboxylic acid, dicarboxylic acids such as dimer acid or ester-forming derivatives thereof, or pentanediol, neopentyl glycol, hexanediol, octanediol, decanediol, cyclohexanedimethanol, hydroquinone, bisphenol A,
Glycols such as 2,2-bis (4'-hydroxyethoxyphenylinyl) propane, xylene glycol, polyethylene glycol, polytetramethylene glycol, and aliphatic polyester oligomers having hydroxyl groups at both ends;
Further, lactone compounds such as glycolic acid, hydroxy acid, hydroxybenzoic acid, hydroxyphenylacetic acid, and hydroxycarboxylic acids such as naphthyl glycolic acid, propiolactone, butyrolactone, caprolactone, parerolactone, and caprolactone can also be used. Polyester having a branched or cross-linked structure using a polyfunctional ester-forming component such as trimethylolpropane, trimethylolethane, pentaerythritol, trimellitic acid, trimesic acid, and pyromellitic acid as long as thermoplasticity can be maintained. It may be. Further, a polyester using an ester-forming component having an ionic group such as sulfoisophthalic acid or sodium parahydroxyethylphenylsulfonate may be used. Also, aromatic nuclei such as dibromoterephthalic acid, tetrabromoterephthalic acid, tetrachloroterephthalic acid, 1,4-dimethyloltetrabromobenzene, tetrabromobisphenol A, and ethylene oxide or propylene oxide adducts of tetrabromobisphenol A Also included are polyester copolymers having halogens using a compound having a halogen compound as a substituent and having an ester-forming group. As particularly preferred polyester resins,
Polybutylene terephthalate and a copolymer containing the same as a main component, particularly preferably as a comonomer component forming the copolymer, isophthalic acid, ethylene glycol, bisphenol A, cyclohexane dimethanol,
Examples thereof include 2,2-bis (β-droxyethoxyphenyl) propane, 2,2-bis (β-hydroxyethoxytetrabromophenyl) propane, and polytetramethylene glycol. Polybutylene terephthalate copolymers having a moderately branched or crosslinked structure obtained by polycondensation using a small amount of the above-mentioned comonomers having three or more esterified functional groups also belong to particularly preferred polyesters. The viscosity of the polyester resin (A) used in the present invention does not need to be particularly limited, and may be any as long as it can be injection-molded. Generally, those having an intrinsic viscosity of 0.6 to 2.0 can be used. It is a feature of the present invention that the blow moldability is remarkably improved by using the following components (B) and (C) in combination even if the viscosity is used. However, a material having too high a viscosity by itself is not preferable because the fluidity deteriorates.

Next, the present invention is characterized in that a thermoplastic polyamide resin (B) is used in combination as a resin component for blow molding. By using such a polyamide resin in combination, high melt tension and drawdown resistance are maintained due to the coexistence effect with the component (C) described below, and the tendency to gel is reduced, and stable fluidity is maintained and large This is effective for efficiently performing blow molding of a hollow molded product in a high cycle, and is economically advantageous. Examples of the polyamide resin which is the component (B) of the present invention include various known polyamide resins. For example, oxalic acid, adipic acid, suberic acid, sebacic acid, terephthalic acid, isophthalic acid, dicarboxylic acids such as 1,4-cyclohexyldicarboxylic acid and ethylenediamine, pentamethylenediamine, hexamethylenediamine, decamethylenediamine, 1,4- Polyamide resin obtained by polycondensation of diamine such as cyclohexyldiamine and m-xylylenediamine; polyamide resin obtained by polymerizing cyclic lactam such as caprolactam and laurin lactam; or cyclic lactam, dicarboxylic acid and diamine And a polyamide resin obtained by copolymerizing a salt thereof. Of these polyamide resins, preferably nylon 6, nylon 66, nylon 6,1
0, nylon 11, nylon 12, and copolymers thereof. Further, a polyamide elastomer resin can also be used as the polyamide resin of the component (B). Polyamide elastomer resin has a bending elastic modulus of 1000, which is a combination of polyamide hard segments and other soft segments.
It is a polyamide-based block copolymer of 0 kgf / cm ² or less. As a soft segment of such an elastomer,
Polyalkylene oxide (alkylene group having 2 to 2 carbon atoms)
6) is a typical example. Although there are many reports on the method of synthesizing such a polyamide elastomer, it is usually performed in two stages, namely, the formation of a nylon oligomer and the increase in molecular weight by esterification. Here, as the polyamide component as the hard segment, nylon 6, nylon 66, nylon 6,10, nylon 11, nylon
Polyamides such as 12 are exemplified. Examples of the polyether component as a soft segment include polyoxyethylene glycol, polyoxypropylene glycol, and polyoxytetramethylene glycol. The type of polyamide resin used is arbitrarily selected depending on the intended use of the molded article, physical properties, etc., but the polyester component (A)
It is not preferable that the melting point is significantly different. Further, the polyamide resin as the component (B) is not limited to one kind, and two or more kinds may be used in combination in order to adjust desired physical properties.

In the present invention, (A) a polyester resin and
(B) The compounding ratio of the polyamide resin is the resin component (A) and
The total amount of (B) is 1 to 99 parts by weight with respect to 100 parts by weight, and any mixing ratio can be set so as to obtain desired physical properties. Is not sufficiently obtained. In general, polyamide resins have a tendency to have a large hygroscopicity. Therefore, considering such physical properties, the mixing ratio of the polyester resin (A) is 50 to 99 parts by weight and the polyamide resin is 50 to 1 parts by weight. Often preferred.

Next, the present invention is to improve blow moldability.
It is characterized by coexisting and melting and kneading a specific styrene copolymer which is a component (C), and a specific amount of the styrene copolymer (C) is defined as a component (A) and a component (B). By compounding and melt-kneading, not only the compatibility of the components (A) and (B) is improved and the two are not only mixed uniformly, but also the most important melt tension and drawdown in blow molding. It is particularly effective for remarkably improving the resistance and facilitating the blow molding of the composition (A) or (B), which has been conventionally impossible. Such a styrenic copolymer
(C) is a copolymer containing styrene and a glycidyl ester of an α, β-unsaturated acid as essential components. In such a copolymer, the styrene unit constituting the copolymer is
It is preferably from 40 to 97% by weight, especially from 50 to 95% by weight. The glycidyl ester of α, β-unsaturated acid, which is another essential component constituting the copolymer of the component (C), is a compound represented by the following general formula (1):

[0008]

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(R is hydrogen or a lower alkyl group) For example, glycidyl acrylate, glycidyl methacrylate, glycidyl ethacrylate,
It is glycidyl itaconate and the like, and glycidyl methacrylate is particularly preferable. The content of the glycidyl ester unit represented by the formula (1) in the styrenic copolymer (C) is preferably 3 to 60% by weight, particularly preferably 5 to 50% by weight. If this content is too high, the composition is liable to gel, causing a problem in blow moldability, and is also not preferable because it deteriorates the surface state of the molded product.
The effect of improving blow moldability such as drawdown property cannot be obtained. Styrene copolymer used in the present invention (C)
Means that, in addition to the above two components, another specific vinyl monomer
A multi-component copolymer copolymerized by using more than one kind may be used, and preferable examples of the third component include acrylonitrile, vinyl chloride, α-methylstyrene, brominated styrene, phenylmaleimide and the like. In particular, acrylonitrile is most suitable as the third component, and a terpolymer in which this is introduced in an amount of 50% by weight or less, preferably 40% by weight or less, has a further excellent effect on improvement of blow moldability. Further, a multi-component copolymer in which a small amount of another vinyl-based monomer is introduced as an auxiliary component other than these may be used, but the inclusion of an olefin-based monomer such as ethylene, propylene, or butene-1 is rather effective. It is not preferable because it reduces the viscosity. Particularly, those containing 40% by weight or more of an olefin such as ethylene significantly deteriorate the melt tension, the blow moldability such as drawdown property, and the surface condition of the molded product. Excluded from The styrenic copolymer as the component (C) of the present invention can be easily prepared from the above-mentioned monomers by a usual radical polymerization method using a radical polymerization catalyst. In addition, the copolymer which is the component (C) of the present invention may be a graft copolymer in which a small amount of a vinyl polymer is chemically bonded in a branched or cross-linked manner to the styrene linear copolymer. Examples of the vinyl monomer constituting such a branched or crosslinked segment include acrylic acid, alkyl acrylate, methacrylic acid, alkyl methacrylate, styrene and acrylonitrile. Such a copolymer having a branched or crosslinked structure is obtained by copolymerizing at least one vinyl monomer and a radical polymerizable organic peroxide in the presence of the styrene-based linear copolymer, for example. A graft copolymer can be obtained by forming a polymer and kneading the mixture by heating. However, the component (C) used in the present invention itself needs to be a fluid substance at the melt-kneading temperature, and if the grafting is too high, the fluidity deteriorates and the dispersibility deteriorates. The effect of improving the blow molding is reduced, and the surface condition of the molded product is also deteriorated. The amount of the styrene copolymer of the component (C) is from 0.2 to 100 parts by weight of the total of the components (A) and (B).
It is 10 parts by weight, particularly preferably 0.5 to 8 parts by weight. If the amount is too small, the effect of improving the blow moldability, which is the object of the present invention, cannot be obtained. If the amount is too large, the entire system tends to be gelled, which is not preferable.

The resin composition used in the blow molding of the present invention may further contain a fibrous, powdery or plate-like filler as the component (D) according to the purpose. Such a filler is effective for imparting mechanical properties, particularly strength and rigidity, to the molded article. Examples of the fibrous filler include glass fiber, asbestos fiber, carbon fiber, silica fiber, silica / alumina fiber, zirconia fiber, boron nitride fiber, silicon nitride fiber, boron fiber, potassium titanate fiber, and stainless steel.
Inorganic fibrous materials such as fibrous materials of metals such as aluminum, titanium, copper, and brass can be used. Particularly typical fibrous fillers are glass fibers. On the other hand, the powdery fillers include carbon black, silica, quartz powder, glass beads, glass powder, calcium silicate, aluminum silicate,
Silicates such as kaolin, talc, clay, diatomaceous earth, wollastonite, oxides of metals such as iron oxide, titanium oxide, zinc oxide, alumina, carbonates of metals such as calcium carbonate and magnesium carbonate, calcium sulfate , Sulfates of metals such as barium sulfate, other silicon carbide, silicon nitride,
Examples include boron nitride and various metal powders. Examples of the plate-like filler include mica, glass flake, various metal foils, and the like. These inorganic fillers can be used alone or in combination of two or more. The combined use of fibrous fillers, especially glass fibers and powdery or plate-like fillers, is a preferred combination in terms of having both mechanical strength, dimensional accuracy, electrical properties, etc. of the molded product, and particularly improving blow moldability. It is also effective.
In using these fillers, it is desirable to use a sizing agent or a surface treatment agent. This example is a functional compound such as an epoxy compound, an isocyanate compound, a titanate compound, and a silane compound. In the present invention, the compounding amount of the filler as the component (D) is a resin component.
100 parts by weight or less for the total of 100 parts by weight of (A) and (B),
Preferably it is 70 parts by weight or less. If the amount is too small, the rigidity and strength tend to be low, and if it exceeds 100 parts by weight, molding will be hindered, which is not preferable.

Further, in addition to the above, other small amounts of other thermoplastic resins can be used together with the resin composition of the present invention. The other thermoplastic resin used here may be any thermoplastic resin that is stable at high temperatures. For example, styrene-based (co) polymers other than the above, polycarbonate, polyphenylene oxide,
Examples thereof include polyalkyl acrylate, polyacetal, polysulfone, polyethersulfone, polyetherimide, polyetherketone, and fluororesin. These thermoplastic resins can be used as a mixture of two or more kinds. Furthermore, the resin composition of the present invention includes known substances generally added to synthetic resins, that is, stabilizers such as antioxidants and ultraviolet absorbers, antistatic agents, flame retardants,
Colorants such as dyes and pigments, lubricants, release agents, crystallization accelerators, crystal nucleating agents, and the like can be appropriately added according to required performance.

In the blow molding method of the present invention, the mixture of the polyester resin (A) and the polyamide resin (B) is mixed with the styrene-based copolymer (C) and melt-kneaded. The desired components are also blended and melt-kneaded, and then subjected to blow molding.The melt-kneading of each of these components may be pelletized once using a single-screw or twin-screw extruder and then subjected to blow molding, Immediately after the melt-kneading, a parison for blow molding can be used for molding. The blow molding of the present invention may be performed by a usual method using a blow molding machine generally used for blow molding of a thermoplastic resin. That is, the above resin composition is plasticized by an extruder or the like, and is extruded or injected by an annular die to form an annular molten or softened intermediate parison. It is blown, inflated, cooled and solidified, and formed as a hollow body. The molding conditions for the resin composition of the present invention include cylinder and die temperatures of 200 to
It is preferably carried out at 290 ° C., and when polybutylene terephthalate is used as the component (A), it is particularly preferably 230 to
260 ° C. The mold temperature is preferably from 40 to 130 ° C, particularly preferably from 80 to 100 ° C. The gas blown into the inside may be air, nitrogen or any other gas, but air is usually used in consideration of economy, and the blowing pressure is 3 to 10 kg /.
cm ² is preferred. Furthermore, it can be molded by a special blow molding machine such as a three-dimensional blow molding machine. Further, the composition of the present invention may be composed of one or more layers, and may be combined with a layer of another material to form a multilayer blow molded article.

[0013]

The resin composition of the present invention has improved melt tension compared to conventional polyester resins or polyamide resins and their compositions, has no parison drawdown during blow molding, and has significantly improved blow moldability. It has no tendency to gel even at high viscosity, maintains stable fluidity, can efficiently obtain a relatively large hollow molded product having a uniform thickness and a good appearance, Excellent in physical properties, heat resistance, etc., intake and exhaust parts around the engine such as the intake manifold of automobiles, containers for high-temperature liquids, chemicals, solvents, containers such as pipes and floats, tubular objects (including irregular shapes), etc. It is possible to provide a hollow molded product that can be used even under severe conditions.

[0014]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

Examples 1-5, Comparative Examples 1-7 As shown in Table 1, 100 parts by weight of a mixture of polybutylene terephthalate (PBT) having an intrinsic viscosity of 1.0 and a polyamide resin (nylon 6 having a relative viscosity of 3.5) were mixed with styrene. -A glycidyl methacrylate copolymer (S / G copolymer) was blended and melt-kneaded with a twin-screw extruder to prepare pellets of the resin composition. Next, using the pellets, a blow molding machine (S-45ND manufactured by Placo Co., Ltd.) was used to die (die diameter 50m).
m, die spacing 3 mm) A temperature of 250 ° C., a mold temperature of 80 ° C., a blowing pressure of 5 kg / cm ² , and a cylindrical hollow container having an average thickness of 2.5 mm and a capacity of 500 cc were formed. At this time, the moldability (drawdown, tearing at the time of blowing, uniformity of the thickness of the molded product, and appearance (roughness of the surface, unevenness of the surface)) were evaluated. For comparison, the same test was performed for the case where the requirements of the present invention were not satisfied.
Table 1 shows the results.

The measuring method used for evaluating the characteristic values is as follows. 1) Melt tension 1 mm in diameter at 255 ° C using a capillary rheometer.
Was measured with a load cell when the resin flowing out of the orifice was pulled down and pulled at a ratio of 10. 2) Melt viscosity 1m in diameter at 255 ° C using a capillary rheometer
Using an orifice having a length of 10 mm and a length of 10 mm, the value at a shear rate of 100 sec ^-1 was measured. 3) Blow moldability • Drawdown The value of the ratio of the time required for the length of the parison extruded from the blow molding machine to reach 120 mm to the time required to reach 600 mm was evaluated as a drawdown index. The drawdown index is 5 for a resin without any drawdown, and 1 for a resin that draws down instantaneously.・ Tear at the time of blowing It was judged whether or not the material was broken at the time of blow molding.・ Thickness uniformity of the molded product Cut the molded product, measure the thickness of three places at the top, center, and bottom of the cylinder with a micrometer, and change the thickness (the highest value and the lowest value with respect to the average thickness). % Of the difference).・ Appearance Surface smoothness (irregularity) was visually observed and ranked as excellent, good, or poor.

Examples 6 to 9 and Comparative Examples 8 to 9 Similar evaluations were made in the same manner as in Example 3 except that the type of the polyamide resin (B) and the type of the component (C) were changed. Table 2 shows the results. Examples 10 to 13 In the same manner as in Examples 3 and 8, the same evaluation was performed by changing the amount of the component (C) used. Table 3 shows the results. Examples 14 to 16 and Comparative Examples 10 to 12 Glass fibers were used as fillers, and similar compositions were evaluated for those having the compositions shown in Table 4. Table 4 shows the results.
Details of the components (A) to (D) used in the above Examples and Comparative Examples
Details are as follows. (A) Component dimethyl terephthalate (TPA) 1938.1 g, 1,4-butane
1348.8 g of tandiol (BD) was used as a transesterification catalyst.
With 1.7 g of tetrabutyl titanate
After charging the reactor and thoroughly replacing it with nitrogen,
The temperature was raised to 0 ° C. and stirring was started. Temperature gradually
And methanol produced as a by-product was distilled off. 250 temperature
℃, the pressure in the reactor was gradually reduced to 0.1 torr.
Stirring is continued for 3 hours at a pressure of
An terephthalate (PBT) was prepared. (B) Component nylon 6; Nylon MC120 nylon 66 manufactured by Kanebo Co., Ltd . ; Nylon nylon 12 manufactured by Ube Industries, Ltd . ; Nylon (C) manufactured by Daicel Co., Ltd. Component S / G (styrene / glycidyl methacrylate copolymer)
(80/20); S / G20 S / AN / G (Styrene / Acrylonitrile / Glizzidi, manufactured by NOF Corporation)
Methacrylate copolymer) (56/24/20); NOF
G50A (D) component glass fiber manufactured by Asahi Fiber Glass

[0018]

[Table 1]

[0019]

[Table 2]

[0020]

[Table 3]

[0021]

[Table 4]

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI C08L 25:08) B29K 25:00 B29K 25:00 67:00 67:00 77:00 77:00 105: 06 105: 06 B29L 22:00 B29L 22:00 C08L 67:02 C08L 67:02 Joint Panel Referee Yoshio Kakizaki Referee Judge Sano Norihiro Referee Yoshihiko Funaoka (56) References JP-A-3-137157 (JP, A) JP-A-2 −53851 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) C08L 67/02 B29C 49/04

Claims (4)

(57) [Claims] (A) a thermoplastic polyester resin consisting mainly of an aromatic dicarboxylic acid or an ester-forming derivative thereof and an aliphatic dihydroxy compound having 2 to 8 carbon atoms, and (B) a thermoplastic polyester resin. (C) Styrene 40 to 97% by weight, glycidyl ester of α, β-unsaturated acid 60 to 3% by weight, acrylonitrile, vinyl chloride
Cycloalkenyl, alpha-methyl styrene, brominated styrene Ren, phenylene
0.2 to 10 parts by weight of a styrene copolymer comprising 0 to 50% by weight of a vinyl monomer selected from lumaleimide ; and (D) at least one of fibrous, powdery, and granular fillers in an amount of 0 to 100 parts by weight. A resin composition for blow molding obtained by melt-kneading. 2. The method according to claim 1, wherein the thermoplastic polyester resin (A) is
Polymers containing terephthalate as the main repeating unit or
The resin composition for blow molding according to claim 1, wherein is a copolymer . 3. The thermoplastic polyester resin (A) is 50 to 99 weights.
Parts by weight, from 50 to 1 part by weight of thermoplastic polyamide resin (B)
The resin composition for blow molding according to claim 1 or 2, comprising: 4. The resin composition according to claim 1,
A hollow molded product manufactured by blow molding using a product.