JPH0987454A - Thermoplastic resin composition, molding material using the same and molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition capable of providing a thermoplastic molding material excellent in water non-absorbability, heat resistance and flexural elastic modulus such as rigidity and giving an excellent molded product appearance, when injection-molded at a high temperature by simultaneously using an organic tin stabilizer, when the components are compounded. SOLUTION: A resin composition in an amount of 100 pts.wt. comprising (A) 5-95wt.% of a modified propylene polymer and (B) 95-5wt.% of a polyamide resin is compounded with (C) 0.01-5 pts.wt. of an organic tin stabilizer [preferably an acid ester tin stabilizer, e.g. dioctyl tin bis(maleic acid monostearyl ester)] to provide the thermoplastic resin composition. A modified propylene polymer produced by melt-kneading and polymerizing a polypropylene polymer with an aromatic monomer and a polar functional group-containing vinylic monomer is preferably used as the component A.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a thermoplastic resin containing a modified propylene polymer (A), a polyamide resin (B) and an organotin stabilizer (C), which gives a molded article excellent in heat resistance and appearance. The present invention relates to a composition, a molding material, and a molded article using the same.

[0002]

2. Description of the Related Art Polyamide resins are widely used as engineering resins in various mechanical parts materials because of their excellent wear resistance, electrical characteristics, mechanical strength, heat resistance, etc. Is not sufficient, and there are drawbacks such as high water absorption. In particular, the water absorption is a problem, and the water-absorbed polyamide resin is not preferable because bubbles tend to be introduced and whiten when the molding process is performed, and not only the mechanical strength is significantly lowered by water absorption, but also the dimensional change and Problems such as deformation also occur. Since the polyamide resin has such drawbacks, its application as an engineering resin is limited, and it is often impossible to make use of the excellent characteristics inherent to the polyamide resin.

On the other hand, polypropylene has a low specific gravity and shows almost no water absorption, but its mechanical strength,
There is a drawback that heat resistance, especially physical properties at high temperature, is insufficient.

Therefore, attempts have been made to use polyamide resins and polypropylene in combination in order to improve the drawbacks of these resins. However, even if the polyamide resin and the polypropylene are simply blended by melt-kneading or the like, the compatibility between the two is poor, so that layer peeling occurs and only a product having poor surface gloss and mechanical strength can be obtained. To improve this compatibility, for example, a composition using polypropylene obtained by modifying a part or all of polypropylene with carboxylic acid or its anhydride (Japanese Patent Publication No. 45-
30943, JP-A-60-118735), and a composition using polypropylene obtained by further modifying the acid-modified polypropylene with a silane compound (Japanese Patent Publication No.
No. 74698) has been proposed.

However, although these conventional compositions are improved in compatibility by the inclusion of modified polypropylene, the effect of improving mechanical properties such as strength is not always sufficient.

We have previously solved the problems of these conventional compositions and obtained a resin composition having the excellent heat resistance and mechanical strength of a polyamide resin and the low water absorption properties of polypropylene. As the blending of a modified propylene polymer obtained by melt-kneading polymerization of an aromatic vinyl monomer and a polar functional group-containing vinyl monomer in the presence of a propylene polymer in a molten state, and a polyamide resin. Therefore, it has been proposed that the above object can be achieved (Japanese Patent Laid-Open No. 5-287163). Also, JP-A-6
A similar composition is proposed in Japanese Patent No. 16899.

However, although the above-mentioned proposals have the effect of improving mechanical properties such as water absorption or bending strength,
When alloying a high melting point polyamide resin such as 6-nylon or aromatic nylon with a modified propylene-based polymer, the modified propylene-based polymer does not have sufficient heat resistance, which causes a problem such as a sink mark in the molded product. Also, in the case of an alloy of polyamide resin such as 6 nylon or 66 nylon and a modified propylene-based polymer, if the molding temperature is increased in order to perform the molding in a short time, the heat resistance of the modified propylene-based polymer may cause an injury. It turns out that there are problems such as the occurrence.

[0008]

DISCLOSURE OF THE INVENTION The present invention provides a thermoplastic resin composition, a molding material and a molding which are excellent in heat resistance, appearance of molded articles, low water absorption and flexural modulus, which are problems of conventional compositions. The purpose is to obtain goods.

[0009]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned drawbacks, the present inventors have found that an organotin stabilizer is used in combination with a modified propylene polymer and a polyamide resin. By doing so, they have found that the above object can be achieved, and completed the present invention.

That is, the present invention is a thermoplastic resin composition comprising a modified propylene polymer (A), a polyamide resin (B), and an organotin stabilizer (C),
Preferably, 100 parts by weight of a resin composition consisting of 5 to 95% by weight of the modified propylene polymer (A) and 95 to 5% by weight of the polyamide resin (B) and 0.0% of the organotin stabilizer (C).
1 to 5 parts by weight, preferably the modified propylene polymer (A) is a polar functional group-containing vinyl monomer modified propylene polymer (a), preferably the modified propylene polymer (A). , Propylene-based polymer aromatic vinyl monomer (a-1) and polar functional group-containing vinyl monomer (a-2)
The present invention provides a thermoplastic resin composition, a molding material, and a molded article using the same, which are obtained by performing a melt-kneading polymerization reaction.

The present invention will be described in more detail.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

(Structure) The modified propylene polymer (A) of the present invention is modified with a polar functional group-containing vinyl monomer, and may be any propylene polymer having a polar functional group. It is preferably obtained by polymerizing a propylene-based polymer with both an aromatic vinyl monomer and a polar functional group-containing vinyl monomer. The aromatic vinyl monomer and the polar functional group-containing vinyl monomer Is a graft-polymerized propylene-based polymer. Modified propylene polymer (A)
The aromatic vinyl monomer-derived component therein is preferably 50% by weight or less, more preferably 1 to 35% by weight, and the polar functional group-containing vinyl monomer-derived component is preferably 10% by weight.
Below, it is more preferably 0.1 to 5% by weight.

The modified propylene-based polymer (A) can be produced by using a granular, powdery, flake-shaped, granular or porous propylene-based polymer and an aromatic vinyl monomer and a polar functional group-containing vinyl. A monomer is impregnated with a radical polymerization initiator, a polymerization reaction method of irradiating high-energy ionizing radiation under an inert gas, or any other method, but preferably a propylene-based polymer in a powder or pellet form. While supplying to the extruder and pressurizing, preferably 130
To 250 ° C. to melt the crystalline propylene-based polymer and melt-knead polymerization reaction of the aromatic vinyl monomer and the polar functional group-containing vinyl monomer, preferably in the presence of a radical initiator. In this method, the strand discharged from the die is cooled and pelletized by using a pelletizer.

The propylene-based polymer which is the raw material of the modified propylene-based polymer (A) is a propylene homopolymer and a copolymer of propylene and other olefins or ethylenic vinyl monomers (preferably any one). Is a copolymer of propylene of 75% by weight or more), and specific examples thereof include isotactic polypropylene, propylene-ethylene copolymer, propylene-butene copolymer and the like. Two or more kinds of these propylene-based polymers may be mixed and used. Further, other polymers can be used as long as the properties of the propylene polymer are not impaired.

The polar functional group-containing vinyl monomer used for modification is a copolymerizable epoxy group-containing vinyl monomer,
Examples thereof include a hydroxyl group-containing vinyl monomer, a carboxyl group-containing vinyl monomer, and an oxazoline group-containing vinyl monomer. Preferred are carboxyl group-containing vinyl monomers and epoxy group-containing vinyl monomers.

The carboxyl group-containing vinyl monomer includes, for example, acrylic acid, methacrylic acid, maleic anhydride, maleic acid and the like and alkyl esters thereof.
These may be used alone or as a mixture. Among them, maleic anhydride is preferred.

Examples of the hydroxyl group-containing vinyl monomer include 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate and 2
-Hydroxybutyl methacrylate and the like can be used alone or as a mixture.

As the epoxy group-containing vinyl monomer, for example, glycidyl methacrylate, glycidyl acrylate, allyl glycidyl ether, methacryl glycidyl ether and the like can be used alone or in combination. Among them, glycidyl methacrylate is preferred.

The vinyl monomer containing an oxazoline group includes 2-vinyl-2-oxazoline, 2-vinyl-4-methyl-2-oxazoline, 2-isopropenyl-2-oxazoline, 2-isopropenyl-4-oxazoline and the like. Can be mentioned.

As the aromatic vinyl monomer used in combination with the polar functional group-containing vinyl monomer, for example, styrene, methylstyrene, vinyltoluene, vinylxylene, ethylvinylbenzene, isopropylstyrene, chlorostyrene, dichlorostyrene, Bromostyrene and the like,
Used alone or as a mixture. Among them, styrene is preferred.

The amount of the aromatic vinyl monomer added is preferably 50% by weight or less, more preferably 1 to 35% by weight, based on the propylene polymer. If it exceeds 50% by weight, the performance of polypropylene is impaired, which is not preferable. Further, the aromatic vinyl monomer is for improving the compatibility with the polyamide resin by preventing the modified propylene-based polymer from having a low molecular weight, so that at least the same amount or more of the polar functional group-containing vinyl monomer is added, preferably It is preferable to add 1 to 5 times the amount.

The amount of the polar functional group-containing vinyl monomer added is
The propylene polymer content is preferably 10% by weight or less, more preferably 0.1 to 5% by weight. If it exceeds 10% by weight, not only the modified propylene polymer may have a low molecular weight but also the adhesiveness, water absorption and mechanical properties of the composition may be adversely affected, which is not preferable.

The radical initiator used in the production of the modified propylene-based polymer (A) is easily dissolved in an aromatic vinyl monomer, and this reaction causes polymerization when the melt-kneading temperature of the propylene-based polymer is abnormal. Moreover, it is desirable that the decomposition temperature for obtaining a half-life of 1 minute is 130 to 250 ° C. Specific examples thereof include alkyl peresters such as tertiary butyl peroxy-2-ethylhexanoate and tertiary butyl peroxybenzoate, 1,
Peroxyketals such as 1-ditertiary butylperoxy-3,3,5-trimethylcyclohexane and 2,2-bis (4,4-ditertiarybutylperoxycyclohexyl) propane, and ketone peroxides such as cyclohexanone peroxide , Benzoyl peroxide, diacyl peroxides such as 2,4-dichlorobenzoyl peroxide, tertiary butyl peroxyisopropyl carbonate, percarbonates such as diethylene glycol-bis (tertiary butyl peroxy carbonate) 2,4,4 Hydroperoxides such as 4-trimethylperoxy-2-hydroperoxide, dicumyl peroxide, 2,5-
Dimethyl-2,5-di- (tert-butylperoxy) hexane, 2,5-Dimethyl-2,5-di- (tert-butylperoxy) hexyne-3, α, α'-
Bis- (tert-butyl peroxyisopropyl)
Examples thereof include dialkyl peroxides such as benzene. These may be used alone or in combination of two or more.

The amount of the radical initiator used is preferably 0.1 to 10 relative to 100 parts by weight of all vinyl monomers.
It is good to set it as 1 part by weight, more preferably 1 to 5 parts by weight.

As the other additives, it is preferable to add a stabilizer because polypropylene is a radical-disintegrating polymer unlike polyethylene. However, it is necessary to consider the type and the amount of addition so as not to hinder the polymerization of the aromatic 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- Butylhydroxybenzyl) 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 There are metal soaps such as, and antacid adsorbents such as magnesium oxide and hydrotalcite. The amount of the stabilizer used is preferably 0.01 to 1 part by weight, and more preferably 0.05 to 0.5 part by weight, based on 100 parts by weight of the propylene polymer.

To carry out the melt-kneading polymerization reaction of the propylene-based polymer with the aromatic vinyl monomer and the polar functional group-containing vinyl monomer, it is preferable to continuously knead them in a closed container such as a Banbury mixer or an extruder. Machine can be used.
The extruder is more preferable than the industrial production such as granulation. Furthermore, the twin-screw extruder is easier to control the supply of reactants, kneading, polymerization time and the like.

The vinyl monomer may be mixed with the propylene-based polymer in advance and then fed to the extruder,
It may be supplied to the molten propylene-based polymer using a liquid feeder, but it is more preferable to mix and impregnate the propylene-based polymer in advance.

The above-mentioned radical initiator may be dissolved in a vinyl monomer in advance and added, or may be added to a mixture of a propylene polymer and a vinyl monomer using a liquid feeder. The stabilizer is preferably mixed in advance with the propylene polymer by using a Henschel mixer or the like.

Since the propylene-based polymer is a radical-disintegrating polymer, unlike the ethylene-based polymer, if the polymer is simply melt-heated, the main chain is apt to be broken, so that the molecular weight is apt to decrease.
Therefore, a modified propylene polymer having a low molecular weight can be obtained by melt-kneading a polar functional group-containing vinyl monomer in the presence of an organic peroxide. However, a modified propylene-based polymer (A) which is preferably melt-kneaded with an aromatic vinyl monomer and a polar functional group-containing vinyl monomer without causing a decrease in molecular weight and has improved compatibility with a polyamide resin
It can be.

The polyamide resin (B) of the present invention is a polymer compound having acid amide (-CONH-) as a repeating unit, which is obtained by ring-opening polymerization of lactam depending on the polymerization mode.
Examples thereof include those obtained by polycondensation of diamine and dibasic acid and those obtained by polycondensation of aminocarboxylic acid. They are,
It has a common name of nylon, such as nylon 6, nylon 12, nylon 46, nylon 11, nylon 6
6, nylon 610, nylon 612, aromatic nylon and the like can be exemplified.

The organotin stabilizer (C) of the present invention is not particularly limited as long as it is an organic compound containing tin in the molecular structural formula, but is preferably an acid ester tin stabilizer.
For example, an alkyl tin thiocarboxylic acid ester stabilizer and an alkyl tin carboxylic acid ester stabilizer are preferable.

Examples of the alkyltin thiocarboxylic acid ester stabilizers include dimethyltin thiodiglycolic acid octyl ester, dibutyltin thiodipropionic acid octyl ester, dilauryltin dithiodipropionic acid ester, dioctyltin dithioglycolic acid ester, dibutyltin dithiol ester. Examples thereof include dipropionate, dimethyltin thiodiglycolate, dioctyltin dithiopropionate and dibutyltin thiodipropionate. Examples of the alkyl tin carboxylic acid ester-based stabilizer include dibutyl tin maleic acid butyl ester, dimethyl tin maleic acid octyl ester, dioctyl tin bis (maleic acid monostearyl ester), dibutyl tin bis (maleic acid monolauryl ester), and dimethyl tin bis. (Maleic acid monostearyl ester), dibutyltin maleate, dibutyltin laurate, dioctyltin laurate butyl ester, dibutyltin dipropionate octyl ester and the like can be exemplified.

In the composition of the present invention, the modified propylene polymer (A) is preferably 5 to 95% by weight, more preferably 20 to 85% by weight, and the polyamide resin (B) is preferably 95 to 5% by weight, More preferably 80 to 15% by weight, and preferably 0.01 to 5 parts by weight, more preferably 0.03 to 10 parts by weight of the organotin stabilizer (C) based on 100 parts by weight of the total of (A) and (B). It contains 1 part by weight. In the composition, when the modified propylene-based polymer (A) is less than 5% by weight, the modified propylene-based polymer (A) has low water absorption,
No improvement effect in molding processability etc. can be obtained. On the other hand, if the polyamide resin (B) is less than 5% by weight, the effect of improving the wear resistance, mechanical properties, heat distortion resistance and the like of the polyamide resin cannot be obtained. On the other hand, if the amount of the organotin stabilizer (C) is less than 0.01 part by weight, the heat resistance improving effect cannot be obtained, and if it is more than 5 parts by weight, the mechanical properties are adversely affected and it is uneconomical.

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, light stabilizers, antistatic agents, antiblocking agents and lubricants. In that case, the timing of addition may be either first mixing with the modified propylene polymer (A) or after mixing with the polyamide resin (B).

The composition of the present invention is produced by dry blending these components with a Henschel mixer, a V blender, a ribbon blender, a tumbler blender, etc.
This mixture is melt-mixed with a kneading machine such as a single-screw or twin-screw extruder, a roll, a Banbury mixer, pelletized or crushed, and then subjected to molding. As the molding method, any method such as injection molding, blow molding, extrusion molding and the like can be adopted.

By doing so, the composition of the present invention is
Since it is possible to obtain thermoplastic resin compositions, molding materials and molded products that are excellent in heat resistance, appearance of molded products, low water absorption, flexural modulus, various industrial materials for injection molding, electronic parts, automobile parts It can be used for machine parts, wire coatings, etc.

[0037]

EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples. However, the following examples and comparative examples do not limit the present invention in any way. In the following, all "parts" and "%" are based on weight unless otherwise specified.

The test methods for the physical properties of the composition and the target physical properties are as follows. Heat resistance: Thermogravimetric analysis (TG-DTA) Decomposition start temperature target of 420 ° C or higher at a temperature rising rate of 10 ° C / min. Appearance of molded product: Injection molding test piece was visually inspected for sink marks, and sink marks were found. Was rated as bad and good without sink marks.

Flexural Modulus: Measurement ASTM D790 Target 20000 kg /
cm ² or more Water absorption rate: 23 using injection molding test pieces (104 mm × 50 mm × 2 mm)
Calculated by the following formula after immersion for 120 hours at ℃

[0040]

<Production of Modified Propylene Polymer> (Reference Example 1) A 30 mm twin-screw extruder manufactured by Brabender (Germany) was used at a barrel temperature of 210 ° C. (however, feeder section 180).
C.) and the die temperature was set to 220.degree. Powdered polypropylene (Hipol B200P, manufactured by Mitsui Petrochemical Co., Ltd.)
To 1000 parts, 0.5 part of Irganox 1010 (stabilizer manufactured by Ciba-Gaiki), 0.5 part of phosphite 168 (stabilizer manufactured by Ciba-Gaiki), and 1 part of calcium stearate (stabilizer) were mixed. This compound is designated as "PP compound 1".
Called. Styrene 50 parts, maleic anhydride 10 parts, Perhexin 25B (NOF Corporation organic peroxide) 1.8
The mixed parts were dry blended with 940 parts of the above-mentioned "PP formulation 1". The dry blend thus obtained was fed to an extruder, melt-kneaded at 15 rpm to carry out a graft reaction, and the strand was cut with a pelletizer to obtain 95
0 parts of product pellet was obtained. The obtained pellet is called "modified PP1".

The styrene content of "modified PP1" is the product
700cm using infrared spectroscopic analysis ^-1(Return to styrene
Genus) and 1380 cm^-1Ratio with (attributable to polypropylene)
From the calibration curve used, the styrene content was 4.8%. Sa
In addition, to determine the presence or absence of styrene component grafting
In addition, polypropylene does not dissolve, but polystyrene does not.
Put the pellets in tetrahydrofuran as the solvent to be dissolved.
Soxhlet extraction under reflux and sterilization in pellets
The graft ratio was also measured from the residual ratio of the
7%.

Reference Example 2 A 30 mm twin-screw extruder manufactured by Brabender (Germany) was set to a barrel temperature of 210 ° C. (however, a feeder section of 180 ° C.) and a die temperature of 220 ° C. 1000 parts of powdered polypropylene (Hipol J400P, manufactured by Mitsui Petrochemical Co., Ltd.), 0.5 parts of Irganox 1010 (stabilizer manufactured by Ciba-Gaiki), phosphite 168
0.5 part (stabilizer manufactured by Ciba-Gaiki) and 1 part calcium stearate (stabilizer) were mixed. This compound is called "P
P formulation 2 ". A mixture of 50 parts of styrene, 15 parts of maleic anhydride, and 1.95 parts of Perhexin 25B (organic peroxide manufactured by NOF CORPORATION) was used as the "PP compound 2".
Dry blended to 935 parts. The obtained dry blend was supplied to an extruder, melt-kneaded at 15 rpm to carry out a graft reaction, and the strand was cut with a pelletizer to obtain 955 parts of product pellets. The obtained pellet is called "modified PP2".

Example 1 A 30 mm twin-screw extruder manufactured by Brabender (Germany) was set to a barrel temperature of 290 ° C. (however, a feeder section was 200 ° C.) and a die temperature of 300 ° C. 30 parts of "modified PP2" and nylon 46 obtained in Reference Example 1
(Unitika 46 nylon F5000) 70 parts and dioctyltin bis (maleic acid monostearyl ester) 0.4 parts (referred to as "stabilizer 1") were mixed and kneaded with the above twin screw extruder. And pelletized.
Using the IS50AM injection molding machine manufactured by Toshiba, test pieces were prepared from the obtained pellets at a resin temperature of 300 ° C., and various physical properties were evaluated. The results are shown in Table 1.

Example 2 Instead of using 30 parts of "modified PP2" and 70 parts of nylon 46 in the preparation of the composition of Example 1, 40 parts of "modified PP1" obtained in Reference Example 1 and nylon 46 (Unitika) Manufactured 46 nylon F50
00) and 0.5 part of dibutyltin maleic acid butyl ester (referred to as "stabilizer 2") were used to prepare a composition, and various physical properties were evaluated in the same manner as in Example 1. The results are shown in Table 1.

Example 3 Instead of using 30 parts of "modified PP2" and 70 parts of nylon 4 in the preparation of the composition of Example 1, 30 parts of "modified PP2" and aromatic nylon (Aren AE200 manufactured by Mitsui Petrochemical Co., Ltd.) were used. ) 70 parts and 0.4 parts of dimethyltin thiodiglycolic acid octyl ester (referred to as "stabilizer 3") were used to prepare a composition, and various physical properties were evaluated in the same manner as in Example 1. The results are shown in Table 1.

(Example 4) A 30 mm twin-screw extruder manufactured by Brabender (Germany) was set to a barrel temperature of 260 ° C (however, a feeder section of 180 ° C) and a die temperature of 280 ° C. 40 parts of "modified PP1" obtained in Reference Example 1 and nylon 66
60 parts (ULTRAMID112 manufactured by BASF) and 0.5 part octyl dibutyltin thiodipropionate (referred to as "stabilizer 4") were blended, and kneaded into pellets by using the above twin-screw extruder. did. The obtained pellets were heated at a resin temperature of 3 using a Toshiba IS50AM injection molding machine.
Specimens were prepared under the condition of 00 ° C and various physical properties were evaluated.
The results are shown in Table 1.

Comparative Example 1 A composition was prepared without using 0.4 part of "Stabilizer 1" in the preparation of the composition of Example 1, and various physical properties were evaluated in the same manner as in Example 1. The results are shown in Table 2.

Comparative Example 2 Instead of using 0.5 part of "Stabilizer 2" in the preparation of the composition of Example 2, a hindered phenolic stabilizer (Sumitizer Chemical's Sumilizer GA) was used.
A composition was prepared by using 0.5 part of -80 "stabilizer 5"), and various physical properties were evaluated in the same manner as in Example 1. The results are shown in Table 2.

COMPARATIVE EXAMPLE 3 Instead of using 0.4 part of "Stabilizer 3" in the preparation of the composition of Example 3, metal soap stabilizer barium stearate (referred to as "Stabilizer 6").
A composition was prepared using 0.6 part and 0.4 part of zinc stearate (referred to as "stabilizer 7"), and various physical properties were evaluated in the same manner as in Example 1. The results are shown in Table 2.

Comparative Example 4 A composition was prepared without using 0.5 part of "Stabilizer 4" in the preparation of the composition of Example 4, and various physical properties were evaluated in the same manner as in Example 1. The results are shown in Table 2.

[0052]

[Table 1]

[0053]

[Table 2]

[0054]

The present invention is a composition comprising a modified propylene-based polymer, a polyamide resin and an organotin-based stabilizer, and in particular, the organotin-based stabilizer allows non-water-absorption and flexural modulus such as rigidity and heat resistance. It is possible to provide a thermoplastic molding material having excellent properties and having an appearance of a molded product which is excellent in injection molding at high temperature.

Claims (7)

[Claims] 1. A thermoplastic resin composition comprising a modified propylene polymer (A), a polyamide resin (B), and an organotin stabilizer (C). 2. A modified propylene-based polymer (A) 5 to 95.
The organic tin-based stabilizer (C) is used in an amount of 0.01 to 5 parts by weight based on 100 parts by weight of a resin composition composed of 100% by weight and a polyamide resin (B) in an amount of 95 to 5% by weight.
The thermoplastic resin composition described. 3. The thermoplastic resin composition according to claim 1, wherein the organotin stabilizer (C) is an acid ester tin stabilizer. 4. The modified propylene-based polymer (A) is an aromatic monomer and a polar functional group-containing vinyl monomer-modified propylene-based polymer (a), according to claim 1. Thermoplastic resin composition. 5. The modified propylene-based polymer (A) is obtained by melt-kneading the propylene-based polymer with an aromatic vinyl monomer (a-1) and a polar functional group-containing vinyl monomer (a-2). The thermoplastic resin composition according to claim 1, which has been reacted. 6. A molding material comprising the thermoplastic resin composition according to any one of claims 1 to 5. 7. A molded product obtained by using the molding material according to claim 6.