JPH0859951A - Thermoplastic resin composition, its production and molding material therefrom - Google Patents

Abstract

PURPOSE: To obtain the subject composition useful for precision injection molding of connector, having excellent heat distortion properties, weld strength, impact resistance, rigidity, water non-absorbing properties, moldability and processability, comprising a modified propylene-based polymer, a polyamide resin and an organic peroxide. CONSTITUTION: This resin composition is obtained by using 100 pts.wt. of a resin composition composed of (A) preferably 5-95wt.% of a propylene-based polymer modified with a polar functional group-containing vinyl monomer and (B) preferably 95-5wt.% of a polyamide resin and (C) preferably 0.01-1 pt.wt. of an organic peroxide. The component A is preferably obtained by subjecting the propylene-based polymer, an aromatic vinyl monomer and a polar functional group-containing vinyl monomer (e.g. epoxy-containing vinyl monomer) to polymerization reaction. The component C has preferably 130-250 deg.C decomposition temperature to obtain one minute half-life period.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a modified propylene polymer (A), a polyamide resin (B) and an organic peroxide (C), which are excellent in heat deformability, weld strength, impact resistance, rigidity and strength. The present invention relates to a thermoplastic resin composition having non-water absorbency and excellent in moldability, a method for producing the same, and a molding material.

[0002]

2. Description of the Related Art Polyamide resins are excellent in wear resistance, electrical characteristics, heat distortion resistance and mechanical strength.
It is widely used as an engineering resin in various mechanical parts materials, but has drawbacks such as insufficient impact resistance and flexibility, and high water absorption. In particular, water absorption is a problem, and the water-absorbed polyamide resin is not preferable because bubbles tend to be whitened when molding 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 take advantage 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,
In particular, there is a drawback that the physical properties at high temperature are 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.

[0006] We previously solved the problems of these conventional compositions and obtained a resin composition having excellent heat distortion resistance and mechanical strength of polyamide resin and low water absorption property of polypropylene. As a product, in the presence of a propylene polymer in a molten state, a modified propylene polymer resin and a polyamide resin obtained by melt-kneading polymerization of an aromatic vinyl monomer and a polar functional group-containing vinyl monomer, It has been proposed that the above objects can be achieved by blending (Japanese Patent Laid-Open No. 5-287163). or,
A similar composition is also proposed in JP-A-6-16899.

[0007] However, although the above proposal shows an effect of improving mechanical properties such as water absorbency or bending strength, it is said to be a drawback of the mold dispersion due to the thickening of the composition and the disadvantage of the microdispersion type alloy depending on the use. The low weld strength was not always sufficient.

[0008]

DISCLOSURE OF THE INVENTION The present invention solves the problems associated with conventional compositions, such as poor moldability and weld strength, and further improves the compatibility between polyamide resin and polypropylene. An object of the present invention is to obtain a resin composition having excellent abrasion resistance, electrical characteristics, heat distortion resistance and mechanical strength of a polyamide resin, and low water absorption characteristics of polypropylene.

[0009]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned drawbacks of the conventional method, the present inventors have found that a vinyl monomer-modified propylene polymer resin (A) containing a polar functional group is used. It was found that the above object can be achieved by using the organic peroxide (C) together when the polyamide resin (B) is blended, and the present invention has been completed.

That is, the present invention is characterized by comprising a polar functional group-containing vinyl monomer-modified propylene polymer (A), a polyamide resin (B), and an organic peroxide (C). Resin composition, modified propylene polymer (A) 5 to 95% by weight, polyamide resin (B) 95 to 5
0.01 to 1 part by weight of the organic peroxide (C) is used in 100 parts by weight of the resin composition consisting of 1% by weight, and the polar functional group-containing vinyl monomer is an epoxy group-containing vinyl monomer or a carboxyl group. Thermoplastic, characterized in that it is a group-containing vinyl monomer, and that the organic peroxide (C) has an decomposition temperature of 130 to 250 ° C. for obtaining a half-life of 1 minute. When the resin composition and the polar functional group-containing vinyl monomer-modified propylene polymer (A) and the polyamide resin (B) are kneaded, it is carried out in the presence of the organic peroxide (C). The present invention provides a method for producing a thermoplastic resin composition and a molding material. The present invention will be described in detail.

(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. Preferably, the propylene-based polymer is obtained by polymerizing both an aromatic vinyl monomer and a polar functional group-containing vinyl monomer, wherein the aromatic vinyl monomer and the polar functional group-containing vinyl monomer are It is a graft-polymerized propylene-based polymer. The aromatic vinyl monomer-derived component in the modified propylene polymer (A) is preferably 50% by weight or less, more preferably 1 to 35% by weight.
The content of the polar functional group-containing vinyl monomer-derived component is preferably 10% by weight or less, more preferably 0.1 to 5% by weight.

As the method for producing (A), an aromatic vinyl monomer and a polar functional group-containing vinyl monomer are added to a granular, powdery, flake, granulate, or porous propylene polymer. Any other method such as a polymerization reaction method of impregnating with a radical polymerization initiator and irradiating high-energy ionizing radiation under an inert gas may be used, but preferably a powder or pellet-shaped propylene-based polymer is supplied to the extruder. While applying pressure, preferably 130 to 250
The crystalline propylene-based polymer is melted by heating at 0 ° C., and the aromatic vinyl monomer and the polar functional group-containing vinyl monomer are melt-kneaded and polymerized preferably in the presence of a radical initiator. This is a method in which the strands discharged from the are cooled and pelletized using a pelletizer.

The propylene-based polymer as the raw material of (A) is a propylene homopolymer and a copolymer of propylene as a main component with other olefins or ethylenic vinyl monomers (preferably 75% by weight or more of all propylene). And is specifically a isotactic polypropylene, a propylene-ethylene copolymer, a propylene-butene copolymer, or the like. 2 of these propylene-based polymers
A mixture of more than one species can be 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 carboxylic acid group-containing vinyl monomer, and an oxazoline group-containing vinyl monomer.
Preferably, it is an epoxy group-containing vinyl monomer or a carboxyl group-containing vinyl monomer.

Examples of the epoxy group-containing vinyl monomer include glycidyl methacrylate, glycidyl acrylate, allyl glycidyl ether, and methacryl glycidyl ether, which may be used alone or in combination. Glycidyl methacrylate is particularly preferable.

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 in combination.

The carboxylic acid group-containing vinyl monomer includes, for example, acrylic acid, methacrylic acid, maleic anhydride, maleic acid and the like and alkyl esters thereof, and these are used alone or as a mixture thereof.

Examples of vinyl monomers containing an oxazoline group include 2-vinyl-2-oxazoline, 2-vinyl-4-methyl-2-oxazoline, 2-isopropenyl-2-oxazoline, 2-isopropenyl-4-oxazoline.

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. Preferred is styrene.

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 to prevent the lowering of the molecular weight of the modified propylene-based polymer and to improve the compatibility with the polyamide resin, at least the same amount or more as the addition amount of the polar functional group-containing vinyl monomer,
It is preferable to add 1 to 5 times the amount.

The addition amount of the polar functional group-containing vinyl monomer 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 is easily dissolved in the aromatic vinyl monomer due to the characteristics of the present invention, and the reaction is carried out at the melt-kneading temperature of the propylene-based polymer.
The decomposition temperature is preferably 130 to obtain a half-life of minutes.
It is desirable that the temperature is 250 ° C. To give a specific example,
t-butyl peroctate, bis (t-butyl peroxy) trimethylcyclohexane, cyclohexanone peroxide, benzoyl peroxide, dicumyl peroxide, t-butyl perbenzoate, dimethyl
Examples include di (t-butylperoxy) hexane and dimethyldi (t-butylperoxy) hexyne.

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 other additives, a polypropylene polymer is a radical-disintegrating polymer unlike polyethylene, so that it is preferable to add a stabilizer. However, it is necessary to consider the kind and addition amount 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), hindered phenolic stabilizers such as trimethyl-tris (di-t-butylhydroxybenzyl) benzene, tetrakis (di-t-butylphenyl)
There are phosphorus-based stabilizers such as biphenylene phosphite and tris (di-t-butylphenyl) phosphite, metal soaps such as zinc stearate and calcium stearate, and antacid adsorbents such as magnesium oxide and hydrotalcite.
The amount of the stabilizer used is preferably 0.01 to 1 part by weight, 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. You can do it with a machine. The extruder is more preferable than the industrial production such as granulation. Further, in the twin-screw extruder, it is easier to control supply of reactants, kneading, polymerization time and the like.

The vinyl monomer may be mixed with the propylene polymer in advance and then fed to the extruder,
Although it may be supplied to the propylene-based polymer in a molten state using a liquid feeder, it is preferable that the propylene-based polymer is mixed and impregnated in advance.

The radical initiator may be dissolved in the vinyl monomer in advance and then added, or may be added to the mixture of the propylene polymer and the vinyl monomer using a liquid feeder. The stabilizer is preferably mixed in advance with the propylene-based 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 molecular weight is apt to decrease due to the breaking of the main chain.
Therefore, a modified propylene-based polymer having a low molecular weight can be obtained even if a polar functional group-containing vinyl monomer is melt-kneaded in the presence of an organic peroxide. However, according to the melt-kneading reaction method, the aromatic vinyl monomer and the polar functional group-containing vinyl monomer are efficiently graft-reacted by reacting in the presence of a stabilizer, and there is no decrease in molecular weight, and the polyamide The modified propylene polymer (A) having improved compatibility with the resin can be used.

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, semi-aromatic Nylon, etc. were mentioned, but among these, Nylon 6, Nylon 66 are preferable. The molecular weight of the polyamide resin is not particularly limited, but usually the relative viscosity (η _rel ) is preferably 0.5 or more,
More preferably, those corresponding to 2.0 or more are used.

The organic peroxide (C) has a decomposition temperature of 13 for obtaining a half-life of 1 minute because the melt-kneading reaction is carried out at the melting temperature of the modified propylene polymer and the polyamide resin.
It is preferably 0 to 250 ° C. Specific examples include t-butylperoctate, bis (t-butylperoxy) trimethylcyclohexane, cyclohexanone peroxide, benzoyl peroxide, dicumyl peroxide, bis (t-butylperoxycarbonyloxy) hexane, Organic peroxides such as t-butylperbenzoate, dimethyldi (t-butylperoxy) hexane, dimethyldi (t-butylperoxy) hexine and the like can be mentioned.

Since the organic peroxide (C) is effective even if added in a small amount, it is preferable to use a masterbatch so that an accurate amount can be added. A product obtained by dispersing 10% by weight of organic peroxide in polypropylene resin is commercially available, and it is convenient to use this. The amount of the peroxide used is preferably 0.01 to 5 parts by weight (masterbatch 0.1 to 5 parts by weight) with respect to 100 parts by weight of the resin composition.
0), more preferably 0.03 to 1 part by weight (masterbatch 0.3 to 10).

The composition of the present invention comprises the modified propylene polymer (A) described above, preferably 5 to 95% by weight, more preferably 20 to 85% by weight, the polyamide resin (B) preferably 95 to 5% by weight, More preferably 80 to 15% by weight,
And organic peroxide (C) preferably 0.01 to 5 parts by weight (masterbatch 0.1 to 50), more preferably 0.0.
3 to 1 part by weight (masterbatch 0.3 to 10).
In the composition, if the modified propylene polymer (A) is less than 5% by weight, the modified propylene polymer (A) cannot obtain the effect of improving the low water absorption and the molding processability. On the other hand, if the polyamide resin (B) is less than 5% by weight, the effect of improving the abrasion resistance, mechanical properties, heat distortion resistance, etc. by the polyamide resin cannot be obtained. On the other hand, if the amount of the organic peroxide (C) is less than 0.01 parts by weight, the effect of improving moldability and weld strength cannot be obtained, and if it is more than 5 parts by weight, mechanical properties such as impact resistance and heat deformability are adversely affected. There is.

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. Unmodified polypropylene may be added as an additional component. In that case, unmodified polypropylene may be added after first mixing with the modified propylene-based polymer (A) or with the polyamide resin (B). It is preferable to add 900 parts by weight or less to 100 parts by weight of the modified propylene polymer (A).

Further, as other additional components, for example, other thermoplastic resins, rubbers, inorganic fillers, pigments, various stabilizers (antioxidants, light stabilizers, antistatic agents, antiblocking agents, lubricants), etc. is there.

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
It is possible to obtain a thermoplastic resin composition which is excellent in non-water absorbency, heat resistance, rigidity, moisture resistance, paintability, surface property, etc. in a well-balanced manner and also has excellent weld strength and molding processability.

[0037]

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 test methods for the physical properties of the composition and the target physical properties are as follows. Melt index: JIS K7210 (2.16 kg, 230 ° C) Moldability target 1-25 Layered peeling: The molded product was immersed in toluene to visually judge the presence or absence of layered peeling Thermal deformation: Measurement JIS K7202 (Vicat temperature Load 5kg) Target 130 ℃ or more Bending strength: Measurement ASTM D790 Target 1.5 * 10 ⁴ kg /
cm ² or more weld strength: measured ASTM D256 Izod impact value (23 ℃)
Target 6 or above Impact strength: Measured ASTM D256 Izod impact value (23 ° C, with notch) Target 6 or above Water absorption rate: 120 at 23 ° C using injection specimen (104 * 50 * 2mm)
Calculated by the following formula after immersion in time

[0039]

Reference Example 1 <Production of Modified Propylene Polymer> A 30 mm twin-screw extruder manufactured by Brabender (Germany) was set to a barrel temperature of 200 ° C. (however, a feeder section 180 ° C.) and a die temperature of 210 ° C. Powdered polypropylene (Hipol B200
P, manufactured by Mitsui Petrochemical Co., Ltd.) Irganox 10 in 930 parts
10 parts (stabilizer manufactured by Ciba-Gaiki) 0.5 parts, phosphite 168 (stabilizer manufactured by Ciba-Gaiki) 0.5 parts, and calcium stearate (stabilizer) 1 part were mixed. A mixture of 50 parts of styrene and 20 parts of glycidyl methacrylate and 2.1 parts of Perhexin 25B (manufactured by NOF CORPORATION) was dry-blended to the above powder polypropylene composition. The obtained dry blend was supplied to an extruder, melt-kneaded at 15 rpm to carry out a graft reaction, and 960 parts of product pellets were obtained through a pelletizer. The obtained pellet is referred to as "modified polypropylene 1".

The styrene content from the calibration curve using the ratio of the styrene content is between 700 cm ^-1 using infrared spectroscopy analysis of the product (attributable to styrene) and 1380 cm ^-1 (assigned to polypropylene) of the modified polypropylene 1] It was 4.8%. Furthermore, in order to determine the presence or absence of grafting of the styrene component, polypropylene is not dissolved, but polystyrene is put into tetrahydrofuran as a solvent that dissolves, and soxhlet extracted under reflux,
When the graft ratio was also measured from the residual ratio of the styrene portion in the pellet, it was 58%.

Reference Example 2 In the production of the modified propylene-based polymer of Reference Example 1, the amount of styrene was increased to 70 parts, and along with that, powdery polypropylene (Hypol B200).
P, manufactured by Mitsui Petrochemical Co., Ltd.) to 900 parts, and Perhexin 2
"Modified polypropylene 2" was produced in the same manner as in Reference Example 1 except that 2.7 parts of 5B (manufactured by NOF CORPORATION) was used.

Reference Example 3 In the production of the modified propylene polymer of Example 1, 40 parts of methacrylic acid and 50 parts of styrene were used in place of 20 parts of glycidyl methacrylate.
To 900 parts of powdered polypropylene (HIPOL B200P, manufactured by Mitsui Petrochemical Co., Ltd.)
"Modified polypropylene 3" was produced in the same manner as in Reference Example 1 except that Perhexin 25B (Nippon Oil & Fats Co., Ltd.) 2.7 parts was used.

Reference Example 4 20 parts of glycidyl methacrylate and polypropylene in powder form (Hipol B200P, manufactured by Mitsui Petrochemical Co., Ltd.) 93 were used except that 50 parts of styrene was not added in the production of the modified propylene polymer of Reference Example 1.
"Modified polypropylene 4" was produced in the same manner as in Reference Example 1 except that 0 part was left as it was and 0.6 part of Perhexin 25B (manufactured by NOF Corporation) was used.

Example 1 A 30 mm twin-screw extruder manufactured by Brabender (Germany) was set to a barrel temperature of 240 ° C. (however, a feeder section 180 ° C.) and a die temperature of 240 ° C. 400 parts of "modified polypropylene 1" obtained in Reference Example 1 and nylon-6 (Kanebo Nylon MC112) 600
And 3 parts of an organic peroxide (Kakuyaku Akzo product, referred to as Visbreak P, PO) were mixed and kneaded into pellets by using the above twin-screw extruder. The obtained pellets were heated to a resin temperature of 270 using a Toshiba IS50AM injection molding machine.
Specimens were prepared under the condition of ° C and various physical properties were evaluated. The results are shown in Table 1.

(Example 2) In the production of the composition of Example 1, 400 parts of "modified polypropylene 1" and nylon-6
Instead of using 600 parts (MC112 manufactured by Kanebo Co., Ltd.), 700 parts of the modified propylene polymer, 300 parts of nylon-6 (MC112 manufactured by Kanebo Co., Ltd.) and an organic peroxide (Kayaku Akzo product, Visbreak P, PO) are used. 5 parts was 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 A modified polypropylene and a modified polypropylene were prepared in the same manner as in Example 1 except that the same amount of "modified polypropylene 2" was used instead of 400 parts of "modified polypropylene 1" in the preparation of the composition of Example 1. The composition was manufactured and various physical properties were evaluated. The results are shown in Table 1.

Example 4 Nylon-6 was prepared by using 300 parts of "modified polypropylene 3" in place of 400 parts of "modified polypropylene 1" in the preparation of the composition of Example 1.
Nylon-66 (manufactured by BASF ULTRAMID11) instead of using 600 parts (MC112 manufactured by Kanebo Co., Ltd.)
2) 700 parts, and further 5 parts of organic peroxide (Kakuyaku Akzo product, referred to as Visbreak P, PO) were mixed, and this was kneaded and pelletized by using a twin-screw extruder at 280 ° C. . Using the IS50AM injection molding machine manufactured by Toshiba, test pieces were prepared from the obtained pellets at a resin temperature of 290 ° C., and various physical properties were evaluated. The results are shown in Table 1.

Comparative Example 1 Instead of using 400 parts of the modified propylene polymer in the preparation of the composition of Example 1, the same amount of polypropylene (Hypol B200, manufactured by Mitsui Petrochemical Co., Ltd.) was used to prepare the composition. Various physical properties were evaluated in the same manner as in Example 1. The results are shown in Table 2.

(Comparative Example 2) A modified polypropylene and a modified polypropylene were prepared in the same manner as in Example 1 except that the same amount of "modified polypropylene 4" was used instead of 400 parts of "modified polypropylene 1" in the preparation of the composition of Example 1. The composition was manufactured and various physical properties were evaluated. The results are shown in Table 2.

Comparative Example 3 A composition was prepared in the same manner as in Example 1 except that the organic peroxide was removed from the composition of Example 1, and various physical properties were evaluated. The results are shown in Table 2.

Comparative Examples 4 and 5 Instead of using the modified propylene polymer and the polyamide resin in the preparation of the composition of Example 1, a polyamide resin (Nylon MC112 manufactured by Kanebo Co., Ltd.) and a polypropylene resin (Hipol B200) were used for the purpose of physical properties. , Manufactured by Mitsui Petrochemical Co., Ltd.) were individually used to produce various compositions, and various physical properties were evaluated in the same manner as in Example 1. The results are shown in Table 2.

[0053]

[Table 1]

[0054]

[Table 2]

[0055]

INDUSTRIAL APPLICABILITY The present invention relates to a polar functional group-containing vinyl monomer (preferably an aromatic vinyl monomer and particularly an epoxy group-containing vinyl monomer or a carboxyl group-containing vinyl monomer in a molten propylene polymer). Modified polypropylene-based polymer (A), a polyamide resin (B) and an organic peroxide (C), which are obtained by melt-kneading polymerization reaction in which
The composition (1) and (2) has excellent mechanical properties such as non-water absorbency and impact strength, and thermal deformability, and is particularly useful for precision injection molding of connectors and the like due to the component (C). It is possible to provide a thermoplastic molding material having a good balance of physical properties such as excellent weld strength.

Claims (7)

[Claims] 1. A thermoplastic resin composition comprising a polar functional group-containing vinyl monomer-modified propylene polymer (A), a polyamide resin (B), and an organic peroxide (C). 2. A modified propylene-based polymer (A) 5 to 95.
100 parts by weight of a resin composition consisting of 95% by weight of the polyamide resin (B) and 95% by weight of the polyamide resin (B), and an organic peroxide (C) of 0.
The thermoplastic resin composition according to claim 1, which is used in an amount of 01 to 1 part by weight. 3. The thermoplastic resin composition according to claim 1, wherein the polar functional group-containing vinyl monomer is an epoxy group-containing vinyl monomer or a carboxyl group-containing vinyl monomer. 4. The modified propylene polymer (A) is obtained by polymerizing a propylene polymer with an aromatic vinyl monomer and a polar functional group-containing vinyl monomer. The thermoplastic resin composition described. 5. The thermoplastic resin according to claim 1, wherein the organic peroxide (C) is an organic peroxide having a decomposition temperature of 130 to 250 ° C. for obtaining a half-life of 1 minute. Resin composition. 6. The melt-kneading of the polar functional group-containing vinyl monomer-modified propylene polymer (A) and the polyamide resin (B) is performed in the presence of an organic peroxide (C). A method for producing a thermoplastic resin composition. 7. A molding material comprising the thermoplastic resin composition according to claim 1.