JPH07118315A - Production of thermoplastic resin composition, and thermoplastic resin composition - Google Patents

Abstract

PURPOSE:To provide the method for improving the compatibility of a polyester resin with a propylene polymer and for producing a high-impact resin compsn. which has both the excellent mechanical strengths inherent in the polyester resin and the low density and low water absorption properties inherent in the propylene polymer by a simple and easy process. CONSTITUTION:A thermoplastic resin compsn. is obtd. by mixing a vinyl monomer and a free-radical initiator into a molten resin mixture comprising a propylene polymer and an arom, polyester resin, and polymerizing the monomer in the resin mixture.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for producing a simple thermoplastic resin composition comprising an aromatic polyester resin and a propylene-based polymer, which is excellent in impact resistance and rigidity and has a low specific gravity, and a method for producing the same. To the thermoplastic resin composition.

[0002]

2. Description of the Related Art Thermoplastic aromatic polyester resins represented by polybutylene terephthalate and polyethylene terephthalate have excellent heat resistance and chemical resistance by themselves, and are reinforced materials such as non-reinforced resin and glass fiber. Molding materials reinforced by are used in various fields such as automobile parts and electronics related parts.
Demand is growing significantly.

However, the polyester resin has low impact resistance, and in particular polybutylene terephthalate resin (hereinafter,
PBT) has a high notch sensitivity, and therefore has a drawback that the Izod impact value with a notch is particularly low. Therefore, when molding the PBT resin, the roots of the bosses and ribs must always have R or taper. Further, the PBT resin is inferior in hydrolysis resistance and practically cannot be used for a long time in hot water of 60 ° C. or higher or in a high temperature and high humidity atmosphere.

On the other hand, among the polyolefins, the propylene-based polymer is a resin that is low in cost, low in specific gravity, excellent in hydrolysis resistance, chemical resistance and mechanical strength, and its use range is extremely wide. It has low heat resistance and rigidity, which has been a problem in expanding applications.

As a method for solving the problems faced by both the aromatic polyester resin and the propylene-based polymer at once, alloying of both has been studied (JP-A-49-120949, etc.).

However, although the impact resistance is slightly improved by these methods, it is at an insufficient level to greatly expand the uses of the aromatic polyester resin. Further, since the affinity between the aromatic polyester resin and the propylene-based polymer is insufficient, there are various problems such as a large decrease in mechanical properties, and further, delamination occurs in the molded product, which is a serious problem in practical use. . Therefore, in addition to a resin composition composed of an aromatic polyester resin and a propylene-based polymer, an epoxy group-containing copolymer composed of an unsaturated epoxy compound and an ethylenically unsaturated compound such as ethylene is used in combination (JP-A-61).
-60744), a resin composition comprising an aromatic polyester resin and a maleic anhydride-modified polypropylene, and an epoxy group-containing copolymer as described above are used in combination (JP-A-61-60746). ing.
Further, a method in which an epoxy group-containing ethylene-based copolymer is used in combination with a resin composition comprising a modified polypropylene obtained by grafting an aromatic polyester resin and an unsaturated epoxy compound onto polypropylene (JP-A-1-213352).
Is also known.

Further, according to the above-mentioned method, it is necessary to prepare a modified propylene polymer once and then melt-knead it with an aromatic polyester, or it is necessary to further add a specific compound. A method of obtaining the resin composition by a manufacturing process has been desired. That is, it would be extremely effective if the resin composition having the excellent physical properties of both resins is obtained by eliminating the above-mentioned complicated steps.

[0008]

Therefore, the present invention solves these conventional problems and further improves the compatibility between the aromatic polyester resin and the propylene-based polymer, and provides an excellent aromatic polyester resin. A resin composition that has mechanical strength such as rigidity, heat resistance, chemical resistance, and has the characteristics of low specific gravity and low water absorption of a propylene-based polymer, and further has excellent impact resistance, An object is to provide a method for producing a thermoplastic resin composition obtained by a simpler method.

[0009]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies to solve the above-mentioned drawbacks of the conventional method, and as a result, in the presence of a resin composition comprising a propylene polymer and an aromatic polyester resin. The inventors have found that the above objects can be achieved by subjecting a vinyl monomer to a melt-kneading polymerization reaction with a radical initiator, and have completed the present invention. The vinyl monomer mentioned here is preferably a monomer mixture obtained by combining an aromatic vinyl monomer and a polar functional group-containing vinyl monomer. Preferably the aromatic vinyl monomer is styrene and preferably the aromatic polyester resin is a polybutylene terephthalate resin.

The present invention will be described in detail below.

(Structure) The aromatic polyester resin used in the present invention is a polyester resin having an aromatic ring as a chain unit and containing an aromatic dicarboxylic acid or its ester derivative and diol or its ester derivative as main components. It is a polymer or copolymer obtained by a condensation reaction.

Examples of the aromatic dicarboxylic acid used herein include terephthalic acid, isophthalic acid, phthalic acid, 2,6-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid,
Bis (P-carboxyphenyl) methane, anthracene dicarboxylic acid, 4,4′-diphenyl dicarboxylic acid,
4,4'-diphenyl ether dicarboxylic acid, 1,2 bis (P-carboxyphenoxy) ethane, ester derivatives thereof and the like can be mentioned. 3 as the acid component
If it is 0 mol% or less, aliphatic dicarboxylic acids such as adipic acid, sebacic acid, azelaic acid and dodecanedioic acid,
It may be substituted with a dicarboxylic acid other than an aromatic dicarboxylic acid such as an alicyclic dicarboxylic acid such as 1,3-cyclohexanedicarboxylic acid or 1,4-cyclohexanedicarboxylic acid or an ester derivative thereof.

The diol component has 2 to 2 carbon atoms.
10 aliphatic diols, namely ethylene glycol, propylene glycol, 1,4-butanediol, 3-methyl-1,3-propanediol, neopentyl glycol, 1,5-pentanedio -, 1,6-hexanediol, decamethylene glycol, cyclohexanediol, cyclohexanedimethanol and the like, and a small amount of long-chain glycol having a molecular weight of 400 to 6000, that is, Polyethylene glycol, poly-1,3-propylene glycol, polytetramethylene glycol and the like may be copolymerized.

Examples of preferred aromatic polyesters used in the present invention include polyethylene terephthalate, polybutylene terephthalate, polyhexamethylene terephthalate, polycyclohexyne dimethylene terephthalate,
Examples thereof include polyethylene-2,6-naphthalate and polybutylene-2,6-naphthalate. Among them, polybutylene terephthalate is preferable.

The aromatic polyester used in the present invention is phenol / tetrachloroethane = 6 at 30 ° C.
The intrinsic viscosity measured in a mixed solvent of 0% by weight / 40% by weight is 0.5 to 1.5 dl / g, preferably 0.6 to 1.3.
It is preferably dl / g. If the intrinsic viscosity of the aromatic polyester is too low, the mechanical properties tend to deteriorate, while if it is too high, the moldability deteriorates, which is not preferable.

The propylene-based polymer of the present invention is a propylene homopolymer or a copolymer of propylene as a main component with other olefins or ethylenic vinyl monomers (each of which is a copolymer containing propylene at 75% by weight or more). ), And specific examples thereof include isotactic polypropylene, propylene-ethylene copolymer, propylene-butene copolymer and the like. These propylene-based polymers can be used alone or in combination. Further, other polymers can be used as long as the properties of the propylene polymer are not impaired.

The blending ratio of the propylene-based polymer and the polyester resin in the present invention may be any blending ratio depending on the intended use and is not particularly limited.

One or more other thermoplastic resins may be added to the composition of the present invention. Other thermoplastic resins include polyethylene, polypropylene, polystyrene, imide-modified polystyrene, polyphenylene sulfide, polyamide, polycarbonate, polyarylate,
ABS resin, imide-modified ABS resin, AES resin, polysulfone, polyphenylene ether, copolymer and / or mixture of polyphenylene ether and polystyrene, polyethersulfone, polyetheretherketone, polyarylsulfone, polyamideimide Examples thereof include thermoplastic resins such as polyester-based, polyamide-based, urethane-based, olefin-based, and styrene-based thermoplastic elastomers.

Preferably, polypropylene, polycarbonate, polyphenylene sulfide, polyamide, polyphenylene ether, copolymer and / or mixture of polyphenylene ether and polystyrene, olefinic elastomer, styrene elastomer, etc. There is. In particular, polypropylene; ethylene-propylene copolymers, ethylene-propylene-diene copolymers, olefinic elastomers such as polybutadiene, polyisoprene, butyl rubber, etc .; styrene-butadiene block copolymers, styrene-isoprene copolymers and these When a styrene elastomer such as a hydrogenated substance and / or an unsaturated group-containing acid anhydride-containing substance is used, the modified propylene polymer of the present invention acts as a suitable compatibilizing agent, so that it can be used as an aromatic polyester. It is easy to obtain a suitable alloy of

The vinyl monomer of the present invention is not particularly limited as long as it is a compound having radical polymerization reactivity, but it is preferably an aromatic vinyl monomer and a polar functional group-containing vinyl monomer. It is a combination mixture of bodies. Specific examples of the aromatic vinyl monomer here include, for example, styrene, methylstyrene, vinyltoluene, vinylxylene, ethylvinylbenzene, isopropylstyrene,
Chlorostyrene, dichlorostyrene, bromostyrene, etc. are mentioned, and these are used individually or in mixture.

As the polar functional group-containing vinyl monomer, epoxy group-containing vinyl monomer, carboxylic acid group-containing vinyl monomer, hydroxyl group-containing vinyl monomer, oxazoline group-containing vinyl monomer, amino group. Examples thereof include a vinyl monomer and the like, and it is sufficient that the compound structure has a polar functional group. Preferably, it is an epoxy group-containing vinyl monomer or a carboxyl group-containing vinyl monomer.

More specifically, examples of the epoxy group-containing vinyl monomer include glycidyl methacrylate,
Glycidyl acrylate, allyl glycidyl ether,
Methacrylglycidyl ether and the like can be mentioned, and these can be used alone or in combination. Glycidyl methacrylate is particularly preferable. The carboxylic acid group-containing vinyl monomer includes, for example, acrylic acid, methacrylic acid, maleic anhydride, maleic acid and the like, and these are used alone or as a mixture thereof.

As the hydroxyl group-containing vinyl monomer, for example, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2
-Hydroxybutyl methacrylate and the like can be used, and these can be used alone or in combination.

As the oxazoline group-containing vinyl monomer, 2-vinyl-2-oxazoline, 2-vinyl-4-methyl-2-oxazoline, 2-isopropenyl-2-oxazoline, 2-isopropenyl-4-oxazoline, etc. There is.

The amount of the aromatic vinyl monomer added is 50% by weight or less, preferably 1 to 35% by weight, more preferably 5 to 35% by weight, based on the propylene polymer to be blended. The aromatic vinyl monomer may be added in order to prevent the propylene polymer from having a low molecular weight, improve the compatibility with the aromatic polyester resin, and improve the reaction rate of the polar functional group-containing vinyl monomer. preferable. That is, since the propylene-based polymer itself is a radical-disintegrating polymer,
In order to react the polar functional group-containing vinyl monomer,
If a radical initiator is simply used, the decomposition reaction of the polymer main chain may occur at the same time, and the high mechanical properties originally possessed by the propylene polymer may not be obtained. Further, if the addition amount of the radical initiator is reduced in order to suppress the decomposition, not only the reaction rate of the polar functional group-containing vinyl monomer is decreased and the unreacted monomer amount is increased, but also the introduction amount of the functional group can be an upper limit. There are cases.

The addition amount of the polar functional group-containing vinyl monomer is 10% by weight or less, preferably 0.1 to 5% by weight, based on the propylene polymer to be blended. If it exceeds 10% by weight, the unreacted monomer increases, which may adversely affect the adhesiveness and mechanical properties of the composition, which is not preferable. If it is less than 0.1% by weight, the compatibility effect is lowered, which is not preferable.

In the present invention, a compound that accelerates the reaction between the functional group of the polar functional group-containing vinyl monomer and the terminal functional group of the aromatic polyester may be further added. These compounds include triphenylamine, 2,4,6-
Tertiary amines such as tris (dimethylaminomethyl) phenol, phosphites such as triphenylphosphite and triisodecylphosphite, phosphonium compounds such as triphenylallylphosphonium bromide, and tertiary phosphines such as triphenylphosphine. , Carboxylic acid metal salts such as lithium stearate, sulfonic acid metal salts such as sodium 3,5-dicarbomethoxybenzenesulfonate, sulfuric acid esters such as sodium lauryl sulfate, etc., and 0.001 to 5 per resin composition. It is preferably added by weight%.

The radical initiator preferably has a decomposition temperature of 130 to 260 ° C. for obtaining a half-life of 1 minute in order to carry out the polymerization at the melt-kneading temperature necessary for carrying out this reaction. Specific examples include t-butyl peroctate, bis (t-butyl peroxy) trimethylcyclohexane, cyclohexanone peroxide, benzoyl peroxide, dicumyl peroxide, t-butyl perbenzoate, dimethyl di (t-butyl peroxide). Oxy) hexane, dimethyldi (t-butylperoxy) hexyne, etc. may be mentioned. The radical initiator is usually 0.1 per 100 parts by weight of the total vinyl monomer added.
It is good to add in a ratio of 10 to 10 parts by weight, preferably 1 to 5 parts by weight. It is also possible to add a powdered propylene polymer impregnated with a radical initiator in advance as a masterbatch. The addition amount of the radical initiator has a great influence on the reactivity of the vinyl monomer and the decomposability of the propylene-based polymer, so that it is necessary to select an appropriate addition amount.

Further, as described above, the propylene-based polymer is a radical-disintegrating polymer unlike other polyolefins such as polyethylene. Therefore, it is preferable to add a stabilizer as another additive. However, it is necessary to consider the type and addition amount so as not to interfere with the polymerization of the vinyl monomer. For example, pentaerythrityl-tetrakis ((di-t-butyl-hydroxyphenyl) propionate), ocdecyl (di-t-butyl-hydroxyphenyl) propionate, thiobis (methyl t-butylphenol), trimethyl-tris (di-t-butyl). Hydroxybenzyl) benzene and other hindered phenol stabilizers, tetrakis (di-t-butylphenyl) biphenylene phosphite, tris (di-t-butylphenyl) phosphite and other phosphorus stabilizers, zinc stearate, calcium stearate, etc. There are antacid adsorbents such as metal soaps, magnesium oxide, and hydrotalcite. The amount of the stabilizer used is usually 0.01 to 1 part by weight, preferably 0.05 to 0.5 part by weight, based on 100 parts by weight of the propylene polymer.

The reaction according to the present invention can be carried out using a closed container such as a Banbury mixer or a continuous kneader such as an extruder. Of these, the extruder is preferable when considering industrial production such as granulation. Further, a twin-screw extruder is more preferable in terms of supply of reactants, high resin kneading property, control of polymerization time, and the like.

As an actual method for producing a thermoplastic resin composition, a resin mixture of a propylene polymer and an aromatic polyester resin in powder or pellet form is impregnated with a vinyl monomer and a radical initiator, and then extruded. It is melt-kneaded at 150 to 280 ° C. while being supplied to a machine and pressurized, and after vinyl monomer is melt-kneaded and polymerized in a kneading device such as an extruder,
The strands discharged from the die are cooled and pelletized using a pelletizer.

The vinyl monomer may be mixed with the resin mixture in advance and then supplied to the extruder, or may be supplied to the molten resin mixture using a liquid feeder.

The same applies to the radical initiator, which may be added by dissolving it in a vinyl monomer in advance, or by adding it using a liquid feeder, or by adding it to a powder such as a propylene polymer in advance. The impregnated mixture may be used as a masterbatch. The stabilizer is preferably mixed in advance with the propylene polymer by using a Henschel mixer or the like.

In addition to these essential components, additional components can be added to the composition of the present invention within a range that does not impair the effects of the invention. Examples of the additional component include other thermoplastic resins, rubbers, inorganic fillers, pigments, various stabilizers (antioxidants, light stabilizers, antistatic agents, antiblocking agents, lubricants) and the like.

In the present invention, inorganic flame retardants such as magnesium hydroxide, aluminum hydroxide and antimony trioxide, halogen-based and phosphorus-based organic flame retardants, and antioxidants are used within the scope of the present invention. Additives such as a UV inhibitor, a lubricant, a dispersant, a coupling agent, a foaming agent, a cross-linking agent, and a coloring agent can be added.

If desired, the composition of the present invention may contain the following reinforcing materials and / or fillers. As these reinforcing materials and / or fillers,
Examples thereof include powdery grains, flat plates, scales, needles, spheres or hollows, and fibers. Specifically, calcium sulfate, calcium silicate, clay, talc, alumina, silica sand, glass powder, metal powder, graphite, silicon carbide, silicon nitride,
Powder / granular filler such as silica, boron nitride, aluminum nitride, carbon black, mica, glass plate, metal foil such as sericite, aluminum flake, flat plate-like or scale-like filler such as graphite, shirasu balloon, metal balloon Hollow fillers such as glass balloons, glass fibers,
Carbon fiber, graphite fiber, whiskers, metal fiber,
Organic fibrous fillers such as asbestos, wosnite, fibrous fillers and aromatic polyamide fibers can be mentioned.

In the present invention, the propylene polymer, the aromatic polyester resin, the vinyl monomer, and the radical initiator are dry-blended with a Henschel mixer, a V blender, a ribbon blender, a tumbler blender, etc. as described above, and then melted. A kneading polymerization reaction may be carried out, or the above vinyl monomer and radical initiator may be reacted with a molten mixture of a propylene-based polymer and an aromatic polyester resin.

That is, the present invention also includes a method of recycling a resin waste material represented by a resin mixture produced from a laminated sheet, a laminated bottle and the like of a propylene polymer and an aromatic polyester resin as a recycled resin.

Thus, the production method of the present invention can provide a thermoplastic resin composition which has a low specific gravity and is well-balanced in impact resistance, heat resistance, rigidity and the like by a simpler method. can do.

[0040]

EXAMPLES Next, the present invention will be described in detail with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples. In the following, all parts and% are based on weight unless otherwise specified.

The methods for testing and evaluating the physical properties of the composition are as follows. Evaluation of delamination : The molding surface was wiped with toluene and the presence or absence of delamination was visually judged. Further, the fracture surface was subjected to etching treatment with hot xylene to elute the polypropylene portion, and the dispersion state was observed with a scanning electron microscope (MSM-9, manufactured by Hitachi Ltd.).

Specific gravity : Specific gravity meter (MIRAGE TRADI
NG Co. , Ltd. EW-120SG)
It was measured.

Flexural modulus (kg / cm ² ): ASTM
It measured according to D790.

Impact strength : According to ASTM D256, Izod impact test, with cutting notch (kgcm / c
m) and no notch (kgcm / cm ² ) were measured using a universal impact tester (universal type, manufactured by Toyo Seiki, hammer load, 30 kg-cm).

Tensile test : Tensile strength (kg / cm ² )
ASTM D638, Tensile Elongation (%) ASTM D3
Dumbbells for tensile test (ASTM IV
No. dumbbell 1.6 mm thick under the following conditions (measuring machine:
Shimadzu Autograph, IS-2000, pulling speed: 1
0 mm / min, distance between marked lines: 25 mm, distance between grips: 50 mm) A tensile test was performed to measure the tensile strength at yield and the tensile elongation at break.

Heat distortion temperature : Measurement The measurement was carried out in accordance with JIS K7207 (load 4.6 Kgf / cm ² ).

Example 1 A 30 mm twin-screw extruder manufactured by Brabender (Germany) was set to have a barrel temperature of 240 ° C. (however, a feeder section of 180 ° C.) and a die temperature of 240 ° C. Irganox 1010 on 100 parts of powdered homopolypropylene (Hipol B200P, manufactured by Mitsui Petrochemical Co., Ltd.)
(Stabilizer manufactured by Ciba-Gaiki) 0.05 parts, phosphite 168 (stabilized by Ciba-Gaiki) 0.05 parts, and calcium stearate (stabilizer) 0.1 parts in advance, and the stabilizer is mixed. It was a thing. The stabilizer-containing powdered homopolypropylene (HIPOL B200P, manufactured by Mitsui Petrochemical Co., Ltd.) (300 parts) was further mixed with 700 parts of PBT resin (Planac 120, manufactured by Dainippon Ink and Chemicals, Inc.), and 15 parts of styrene was added. Glycidyl methacrylate 9
0.7 parts of Perhexin 25B [dimethyldi (t-butylperoxy) hexin NOF CORPORATION] was mixed with
A dry blend was prepared. The obtained dry blend was supplied to an extruder and melt-kneaded at 20 rpm to perform a melt-kneading reaction to obtain product pellets. The obtained pellets were heated to a resin temperature of 25 using an IS50AM injection molding machine manufactured by Toshiba.
Injection test pieces were prepared under conditions of 0 ° C. and mold temperature of 60 ° C., and various physical properties were evaluated. The results are shown in Table 1. Further, when the dispersibility was evaluated by the SEM observation described above, it was found that the polypropylene had a mean particle size diameter of about 1 μm and was dispersed, and the dispersibility was good.

Example 2 A thermoplastic resin composition was produced by using the same amount of methacrylic acid instead of using 9 parts of glycidyl methacrylate in the production of Example 1, and various physical properties were obtained in the same manner as in Example 1. Was evaluated. The results are shown in Table 1.

(Example 3) In the production of Example 1, 500 parts of homopolypropylene (Hipol B200P, manufactured by Mitsui Petrochemical Co., Ltd.) and 500 parts of PBT resin (Planac 120, manufactured by Dainippon Ink and Chemicals, Inc.) were used. Example 1 except that 25 parts of styrene and 15 parts of glycidyl methacrylate were replaced with 1.2 parts of Perhexin 25B [dimethyldi (t-butylperoxy) hexin manufactured by NOF CORPORATION].
A thermoplastic resin composition was produced under the same conditions as above, and various physical properties were evaluated in the same manner as in Example 1. The results are shown in Table 1.
Shown in.

Example 4 Instead of using 300 parts of homopolypropylene (Hipol B200P, manufactured by Mitsui Petrochemical Co., Ltd.) in the production of Example 1, the same amount of block polypropylene (Highpol J340P, manufactured by Mitsui Petrochemical Co., Ltd.) was used. Example 1 to produce a thermoplastic resin composition.
Various physical properties were evaluated in the same manner as. The results are shown in Table 1. Unit in table: parts by weight

[0051]

[Table 1]

Comparative Example 1 In the production of Example 1, only 300 parts of homopolypropylene (Hypol B200P, manufactured by Mitsui Petrochemical Co., Ltd.) and 700 parts of PBT resin (Planac 120, manufactured by Dainippon Ink and Chemicals, Inc.) Example 1 was mixed and melt-kneaded to produce a thermoplastic resin composition.
Various physical properties were evaluated in the same manner as. The results are shown in Table 2. The obtained molded product was delaminated and a uniform molded product could not be obtained. In addition, as in Example 1, SEM
When the dispersibility was evaluated by observation, it was found that the polypropylene had an average particle diameter of about 10 μm and was dispersed, and the dispersibility was poor. Further, in the tensile test, there was no elongation and the sample immediately broke.

Comparative Example 2 Instead of using homopolypropylene (Hypol B200P, manufactured by Mitsui Petrochemical Co., Ltd.) in Comparative Example 1, the same amount of block polypropylene (Hypol J340, manufactured by Mitsui Petrochemical Co., Ltd.) was used. Except for this, in the same manner as in Example 1, melt kneading was performed to produce a thermoplastic resin composition, and various physical properties were evaluated in the same manner as in Example 1. The results are shown in Table 2. The molded product obtained in the same manner as in Comparative Example 1 was delaminated, and a uniform molded product could not be obtained. Further, in the tensile test, there was no elongation and the sample immediately broke.

Comparative Examples 3 and 4 Polypropylene resin (Hipol B200, manufactured by Mitsui Petrochemical Co., Ltd.) for comparison of physical properties.
And PBT resin (Planac 120, manufactured by Dainippon Ink and Chemicals, Inc.) were used alone to produce molded products, and various physical properties were evaluated in the same manner as in Example 1.

[0055]

[Table 2]

[0056]

INDUSTRIAL APPLICABILITY In the present invention, a vinyl monomer and a radical initiator are subjected to a melt-kneading polymerization reaction in the presence of a resin composition comprising a propylene polymer and a polyester resin, thereby producing a polyester resin and a propylene-based polymer. By improving the compatibility with the polymer, the excellent mechanical strength of the polyester resin, and the low specific gravity and low water absorption characteristics of the propylene-based polymer are combined to achieve high impact resistance, heat resistance, rigidity, etc. It is possible to provide a well-balanced and excellent resin composition by a simpler method.

Furthermore, the present invention is very effective as a method for recycling a resin waste material such as a resin mixture containing propylene polymer and polyester resin as main components.

Claims (6)

[Claims] 1. A thermoplastic resin composition characterized in that a vinyl monomer undergoes a melt-kneading polymerization reaction with a radical initiator in the presence of a resin composition comprising a propylene-based polymer and an aromatic polyester resin. Production method. 2. The thermoplastic resin composition according to claim 1, wherein the vinyl monomer is a monomer mixture formed by combining an aromatic vinyl monomer and a polar functional group-containing vinyl monomer. Method of manufacturing things. 3. The method for producing a thermoplastic resin composition according to claim 2, wherein the polar functional group-containing vinyl monomer is an epoxy group-containing vinyl monomer or a carboxyl group-containing vinyl monomer. . 4. The method for producing a thermoplastic resin composition according to claim 2, wherein the aromatic vinyl monomer is styrene. 5. The method for producing a thermoplastic resin composition according to claim 1, wherein the aromatic polyester resin is a polybutylene terephthalate resin. 6. A thermoplastic resin composition obtained by the method for producing a thermoplastic resin composition according to claim 1.