JPH03296563A - Thermoplastic resin composition - Google Patents

Abstract

PURPOSE:To obtain the title composition which is excellent in impact resistance and water resistance and has heat resistance, mechanical properties and oil resistance inherent in polyamide resin by mixing a polyamide resin with a specified multiphase structure thermoplastic resin. CONSTITUTION:A thermoplastic resin composition is obtained by mixing a polyamide resin with a multiphase structure thermoplastic resin which is a grafted precursor comprising a propylene polymer (A) and a vinyl copolymer (B) obtained from a vinyl monomer having an epoxy group and/or an acid group and another vinyl monomer and prepared by copolymerizing said vinyl monomer with at least one radical-polymerizable organic peroxide of formula I or II or a multiphase structure prepared by melt-kneading this precursor and in which either A or B forms a dispersed phase of a particle diameter of 0.001-10mu. In formulas I and II, R1 is H or 1-2C alkyl; R2 and R7 are each H or CH3; R6 is H or 1-4C alkyl; R3, R4, R8 and R9 are each 1-4C alkyl, R5 and R10 are each 1-12C alkyl, phenyl, alkyl-substituted phenyl or 3-12C cycloalkyl; m is 1 or 2; and n is 0, 1 or 2.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a thermoplastic material with excellent heat resistance, impact resistance, oil resistance, and water resistance that can be used in a wide range of fields such as electrical/electronic mechanical parts and automobile parts. This invention relates to a resin composition.

[Conventional technology]

In general, polyamide resins have excellent heat resistance, mechanical properties, oil resistance, etc., and are widely used in various molded products, but improvements in impact resistance and water resistance have been desired.

Therefore, attempts have been made to blend modified propylene polymers with polyamide resins in order to improve these properties. For example, JP-A-60-170665 and JP-A-60-177,073 disclose that a propylene polymer grafted with an unsaturated carboxylic acid or anhydride monomer is blended with a polyamide resin. A method is disclosed.

[Problem to be solved by the invention]

However, because the above-mentioned conventional polyamide resin and propylene polymer generally have poor compatibility, propylene polymer can only be blended in small amounts with polyamide resin, and molded products of this blend have poor heat resistance. There was a problem that the strength and impact resistance tended to decrease. Furthermore, since the acid-modified propylene polymer also has a low grafting rate with the acid group-containing vinyl polymer, there is a problem in that the compatibility is still insufficient when blended with the polyamide resin.

An object of the present invention is to provide a thermoplastic resin composition that has excellent impact resistance and water resistance while retaining the heat resistance, mechanical properties, and oil resistance of polyamide resins.

[Means to solve the problem]

In order to solve the above problems, the present invention employs a method of comprising a polyamide resin and a thermoplastic resin with a multiphase structure as shown below.

Multiphase structure thermoplastic resin: Vinyl copolymer obtained from 5 to 95% by weight of a propylene polymer, an epoxy group-containing vinyl monomer and/or an acid group-containing vinyl monomer, and other vinyl monomers. A thermoplastic resin with a multiphase structure consisting of 95 to 5% by weight of the vinyl monomer and at least one radically polymerizable organic peroxide represented by the following general formula (a) or (b). A grafted precursor obtained by copolymerization in propylene polymer particles or a multiphase structure obtained by melt-kneading this grafted precursor, in which either the propylene polymer or the vinyl copolymer has a particle size of 0. A thermoplastic resin with a multiphase structure that forms a dispersed phase of .001-10 μm.

CHz = CR+ COO(CHI CHRI
0)-COOOCRs R4Rs”・
” ・ ・(a) CH2=CR5CHI O(C
HI CHI7 0)--C000CR Hatake Rg
Rlo ・ ・ ・ ・ ・(b) Above formula (a), (b
), R1 is a hydrogen atom or an alkyl group having 1 to 2 carbon atoms, R1 and R7 are a hydrogen atom or a methyl group, R6 is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, R1, R4 and R
m and Re are each an alkyl group having 1 to 4 carbon atoms, RI%
R10 represents an alkyl group having 1 to 12 carbon atoms, a phenyl group, or an alkyl group; R5 and R10 represent a cycloalkyl group having 3 to 12 carbon atoms; m is 1 or 2; and n is 0.1 or 2.

Next, each component of the present invention will be sequentially explained.

Examples of the polyamide resin include nylon 6, nylon 6.6, nylon 6.10. Aliphatic polyamide resins such as nylon 6/12, nylon 11, nylon 12, nylon 4/6, etc., aromatic polyamide resins such as hexamethylene diamine terephthalamide, hexamethylene diamine isophthalamide, xylene group-containing polyamide, and their modified products. Or a mixture thereof is used. Among these, nylon 6 and nylon 6.6 are particularly preferred.

The propylene polymer in the multiphase thermoplastic resin used in the present invention is crystalline polypropylene, which includes propylene homopolymer and other α-olefins mainly composed of propylene or polar ethylenically unsaturated monomers. It refers to copolymers with propylene containing 75% by weight or more of propylene, or mixtures thereof. Further, other polymers may be mixed as long as the properties of the propylene polymer are not impaired.

Specifically, for example, isotactic polypropylene,
Typical examples include crystalline propylene-ethylene random copolymer, crystalline propylene-ethylene block copolymer, crystalline propylene-butene-1 random copolymer, maleic anhydride-modified polypropylene, etc., and these may be used alone or in mixtures. is used.

Next, the vinyl copolymer in the multiphase thermoplastic resin used in the present invention refers to one or more monomers of epoxy group-containing vinyl monomers or acid group-containing vinyl monomers. and at least one other vinyl monomer, wherein the epoxy group-containing vinyl monomer or the acid group-containing vinyl monomer contains 100% of the other vinyl monomer.
It is desirable to use 0.1 to 100 parts by weight. Outside this range, the compatibility of the multiphase thermoplastic resin with the polyamide resin decreases, making it difficult to improve impact resistance and water resistance.

The epoxy group-containing vinyl monomers include glycidyl acrylate, glycidyl methacrylate, monoglycidyl itaconate, monoglycidyl butenetricarboxylate, diglycidyl butenetricarboxylate, triglycidyl butenetricarboxylate,
and glycidyl esters such as α-chloroallyl, maleic acid, crotonic acid, fumaric acid, glycidyl ethers such as vinyl glycidyl ether, allyl glycidyl ether, glycidyloxyethyl vinyl ether, styrene-p-glycidyl ether, p-glycidyl styrene, etc. Among these, particularly preferred are glycidyl methacrylate, acrylic glycidyl ether, and the like.

In addition, examples of acid group-containing vinyl monomers include acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, crotonic acid, maleic acid monoester, fumaric acid monoester, and metal salts thereof, maleic anhydride, Examples include itaconic anhydride.

Other vinyl monomers include vinyl aromatic monomers such as styrene, nuclear substituted styrenes such as methylstyrene,
Dimethylstyrene, ethylstyrene, isopropylstyrene, chlorstyrene, α-substituted styrene, such as α-methylstyrene, α-ethylstyrene, (meth)acrylic acid monomer, (meth)acrylic acid ester monomer, such as (
Methyl acrylate, ethyl (meth)acrylate,
Examples include alkyl esters having 1 to 7 carbon atoms such as glycidyl (meth)acrylate, (meth)acrylonitrile, and vinyl ester monomers such as vinyl acetate and vinyl propionate.

Furthermore, vinyl halides or vinylidene (especially vinyl chloride, vinylidene chloride), vinylnaphthalene, vinylcarbazole, acrylamide, methacrylamide, maleic anhydride, maleimides such as phenyl or cyclohexyl, and other vinyl type monomers may also be used. Can be done.

A thermoplastic resin with a multiphase structure as used in the present invention is a resin in which a vinyl copolymer or propylene polymer, which is a different component, is uniformly dispersed in a spherical shape in a propylene polymer or vinyl copolymer matrix. refers to what is being held.

The particle size of the dispersed polymer is 0.001 to 10 μm,
Preferably it is 0.01 to 5 μm. If the dispersed resin particle size is less than 0.001 μm or more than 10 μm, the dispersibility when blended into a polyamide polymer will be poor, for example, the appearance will deteriorate, the heat resistance will decrease, and the improvement effects such as impact resistance will be insufficient. do.

The number average degree of polymerization of the vinyl copolymer in the multiphase structured thermoplastic resin of the present invention is 5 to 10,000, preferably 10 to 5.
．． The range is 000.

If the number average degree of polymerization is less than 5, the paintability of the thermoplastic resin composition of the present invention will not improve, which is not preferable.

Furthermore, if the number average degree of polymerization exceeds 10,000, the melt viscosity will be high, resulting in decreased moldability and surface gloss, which is not preferred.

The multiphase thermoplastic resin of the present invention contains 5 to 95% by weight, preferably 20 to 90% by weight of a propylene polymer. Therefore, the vinyl copolymer content is 95 to 5% by weight, preferably 80 to IO% by weight.

If the propylene polymer content is less than 5% by weight, impact resistance and water resistance will be insufficiently improved, and if the propylene polymer content exceeds 95% by weight, the compatibility with the polyamide resin will be insufficient, resulting in insufficient heat resistance. Sexuality decreases.

The grafting method for producing the multiphase thermoplastic resin of the present invention may be any of the generally well-known methods such as chain transfer method and ionizing radiation irradiation method, but the most preferred method is the following method. This is based on the method shown. The reason for this is that the grafting efficiency is high, secondary aggregation due to heat does not occur, so the performance is more effective, and the manufacturing method is simple.

Hereinafter, the method for producing the thermoplastic resin composition of the present invention will be described in detail.

That is, 100 parts by weight of a propylene polymer is suspended in water, and 5 to 400 parts by weight of at least one vinyl monomer is suspended in water.
0.1 to 100 parts by weight of one or more mixtures of epoxy group-containing vinyl monomers or acid group-containing vinyl monomers per 100 parts by weight of the above vinyl monomer;
One type or a mixture of two or more types of radically polymerizable organic peroxides represented by the following general formula (a) or (b) is added in an amount of 0.1 to 10 parts by weight per 100 parts by weight of the vinyl monomer in total. parts and the decomposition temperature to obtain a half-life of 10 hours is 40
Add a solution of 0.01 to 5 parts by weight of a radical polymerization initiator at ~90°C to a total of 100 parts by weight of vinyl monomer and radically polymerizable organic peroxide to initiate radical polymerization. The propylene polymer is impregnated with a vinyl monomer, a radically polymerizable organic peroxide, and a radical polymerization initiator by heating under conditions that substantially do not cause decomposition of the agent, and the impregnation rate is 50% by weight or more of the initial amount. When the temperature of the aqueous suspension is reached, the temperature of the aqueous suspension is raised, and the vinyl monomer and the radically polymerizable organic peroxide are copolymerized in the propylene polymer to obtain the grafted precursor (A). .

This grafted precursor is also a multiphase thermoplastic.

Therefore, this grafting precursor (A) may be directly melt-mixed with the polyamide resin.

Moreover, the multiphase structure thermoplastic resin of the present invention can also be obtained by kneading the grafted precursor (A) while melting at 100 to 300°C. At this time, a propylene polymer (B) or a vinyl copolymer (C
) can also be mixed and kneaded while melting to obtain a multiphase thermoplastic resin. Most preferred is a thermoplastic resin with a multiphase structure obtained by kneading a grafted precursor.

The radically polymerizable organic peroxide has the above-mentioned general formula (a
) or the compound represented by the above-mentioned general formula (b).

Examples of the radically polymerizable organic peroxide represented by the general formula (a) include t-butylperoxyacryloyloxyethyl carbonate, t-amylperoxyacryloyloxyethyl carbonate, and t-hexylperoxyacryloyloxyethyl carbonate. , 1, 1, 3.3-
Tetramethylbutylperoxyacryloyloxyethyl carbonate, cumylperoxyacryloyloxyethyl carbonate, p-isopropylcumylperoxyacryloyloxyethyl carbonate, t-butylperoxyacryloyloxyethyl carbonate, t-amylperoxyacryloyloxyethyl carbonate , t-
Hexylperoxymethacryloyloxyethyl carbonate, 1.3.3-Tetramethylbutylperoxyacryloyloxyethyl carbonate, cumylperoxyacryloyloxyethyl carbonate, p-isopropylcumylperoxyacryloyloxyethyl carbonate, t- Butylperoxymethacryloyloxyethyl carbonate, t-amylperoxyacryloyloxyethoxyethyl carbonate, t-hexylperoxyacryloyloxyethoxyethyl carbonate, 1.1
, 3.3-Tetramethylbutylperoxyacryloyloxyethoxyethyl carbonate, cumylperoxyacryloyloxyethoxyethyl carbonate, p-isopropylcumylperoxyacryloyloxyethoxyethyl carbonate, t-butylperoxymethacryloyloxyethoxyethyl carbonate , t-amylperoxyacryloyloxyethoxyethyl carbonate, t
-Hexylperoxymethacryloyloxyethoxyethoxyethyl carbonate, 1.3.3-Tetramethylbutylperoxymethacryloyloxyethoxyethyl carbonate, cumylperoxymethacryloyloxyethoxyethoxyethyl carbonate, p-isoprobylcumylperoxymethacryloyloxyethoxyethyl carbonate, t-
Butylperoxyacryloyloxyisopropyl carbonate, t-amylperoxyacryloyloxyisopropyl carbonate, t-hexylperoxyacryloyloxyisopropyl carbonate, l, 1.3.3-
Tetramethy, rubylperoxyacryloyloxyisopropyl carbonate, cumylperoxyacryloyloxyisopropyl carbonate, p-isopropylcumylperoxyacryloyloxyisopropyl carbonate, t-butylperoxymethacryloyloxyisopropyl carbonate, t-amylperoxyacryloyloxyisopropyl carbonate, t-hexylperoxyacryloyloxyisopropyl carbonate, 1, ■
, 3.3-tetramethylbutylperoxymethacryloyloxyisopropyl carbonate, cumylperoxyacryloyloxyisopropyl carbonate, p-isopropylcumylperoxyacryloyloxyisopropyl carbonate, and the like.

Furthermore, as the radically polymerizable organic peroxide represented by the general formula Cb), t-butylperoxyallyl carbonate, t-amylperoxyallyl carbonate, t-
Hexylperoxyallyl carbonate, 1,1,3.
3-tetramethylbutylperoxyallyl carbonate, p-menthane peroxyallyl carbonate, cumyl peroxyallyl carbonate, t-butylperoxymethallyl carbonate, t-amylperoxymethallyl carbonate, t-hexylperoxymethallyl carbonate, 1.1 .3.3-Tetramethylbutylperoxymethallyl carbonate, p-menthane peroxymethallyl carbonate, cumylperoxymethallyl carbonate, t-butylperoxyallyloxyethyl carbonate, t-amylperoxyallyloxyethyl carbonate, t-hexyl Peroxyallyloxyethyl carbonate, t-butylperoxymethallyloxyethyl carbonate, t-amylperoxymethallyloxyethyl carbonate, E-hexylperoxyallyloxyethyl carbonate, t-butylperoxyallyloxyisopropyl carbonate, t-amylperoxyallyloxy Isopropyl carbonate, t-hexylperoxyallyloxyisopropyl carbonate, t-butylperoxymethallyloxyisopropyl carbonate, t-amylperoxyallyloxyisopropyl carbonate, t-
Examples include hexylperoxymetallyloxyisopropyl carbonate.

Among these, t-butylperoxyacryloyloxyethyl carbonate, t-butylperoxymethacryloyloxyethyl carbonate, -butylperoxyallyl carbonate, and t-butylperoxymethallyl carbonate are preferred.

In the present invention, 0-1 parts by weight of the resin component containing the propylene polymer and the multiphase thermoplastic resin
Up to 50 parts by weight of inorganic fillers can be incorporated.

If the amount of filler added exceeds 150 parts by weight, the impact strength of the molded article will decrease, which is not preferable.

Examples of the above-mentioned inorganic fillers include those having shapes such as powder, plate, scale, needle, spherical, hollow, and fibrous, and specific examples include calcium sulfate, calcium silicate, clay, diatomaceous earth, Powder-like fillers such as talc, alumina, silica sand, glass powder, iron oxide, metal powder, graphite, silicon carbide, silicon nitride, silica, boron nitride, aluminum nitride, carbon black; mica, glass plate, sericite, pyrophyll Flat or scaly fillers such as lights, metal foils such as aluminum flakes, and graphite; Hollow fillers such as shirasu balloons, metal balloons, glass balloons, and pumice; glass fibers, carbon fibers, graphite fibers, whiskers, and metals fiber, silicone carbide fiber,
Examples include mineral fibers such as asvert and wostonite.

The surface of the inorganic filler is treated with stearic acid, oleic acid, palmitic acid or their metal salts, paraffin wax, polyethylene wax or modified products thereof, organic silane, organic borane, organic titanate, etc. It is preferable to keep it.

The thermoplastic resin composition of the present invention has a temperature of 150 to 350°C.
It is preferably produced by melting and mixing at 180 to 330°C. If the above temperature is less than 150℃,
This is not preferable because the melting may be incomplete or the melt viscosity may be high, resulting in insufficient mixing and the appearance of phase separation or delamination in the molded product.

Moreover, if the temperature exceeds 350°C, the resins to be mixed may decompose or gel, which is not preferable.

The melting and mixing can be carried out using a commonly used mixer such as a Banbury mixer, a pressure kneader, a kneading extruder, a twin screw extruder, or a roll.

The present invention further includes inorganic flame retardants such as magnesium hydroxide and aluminum hydroxide, organic flame retardants such as halogen-based and phosphorus-based flame retardants, metal powder, talc, glass fiber, carbon fiber, wood, etc., without departing from the gist of the invention. Organic or inorganic fillers such as powders, antioxidants, UV inhibitors, lubricants, dispersants, coupling agents, foaming agents, crosslinking agents, additives such as colorants, other polyolefin resins, SBS, 5EBS
Elastomers such as; engineering plastics such as aromatic polyester, polyphenylene ether, polycarbonate, polyoxymethylene, polyphenylene sulfide; and vinyl resins such as polystyrene, ABS, MBS, and polyvinyl chloride may be added.

[Effect]

By employing the above means, a specific radically polymerizable organic peroxide, an epoxy group-containing vinyl monomer and/or an acid group-containing vinyl monomer, and other vinyl monomers are contained in the propylene polymer particles. A grafted precursor is formed by graft polymerization, or a grafted polymer is obtained by melt-kneading this grafted precursor, and the propylene polymer or vinyl copolymer has a fine particle size. A thermoplastic resin with a multiphase structure is obtained by forming a spherical dispersed phase having contains a grafting precursor or a graft polymer, and the dispersed phase exists uniformly and stably, so the compatibility with the polyamide resin is improved, and as a result, the impact resistance of the thermoplastic resin composition is improved. It is thought that excellent performance such as water resistance will be exhibited.

〔Example〕

The present invention will be specifically explained below with reference to Reference Examples, Examples, and Comparative Examples.

Reference Example 1 (Production of Multiphase Structure Thermoplastic Resin A) 2,500 g of pure water was placed in a stainless steel autoclave with a capacity of 51, and 2.5 g of polyvinyl alcohol was further dissolved therein as a suspending agent. Among these is a propylene-based polymer “Nisseki Polypro J724NJ (trade name, manufactured by Nippon Petrochemical Co., Ltd.)”.
700 g was added and stirred and dispersed. Separately, benzoyl peroxide as a radical polymerization initiator “Niper BJ
(Product name, manufactured by NOF Corporation) 1.5 g, 6 g of t-butylperoxymethacryloyloxyethyl carbonate as a radically polymerizable organic peroxide, 30 g of maleic anhydride as an acid group-containing vinyl monomer, and 30 g of maleic anhydride as a vinyl monomer. The solution was dissolved in 270 g of styrene as a body, and this solution was poured into the autoclave and stirred. Next, the autoclave was heated to 60 to 65° C. and stirred for 2 hours to impregnate the vinyl monomer containing the radical polymerization initiator and the radically polymerizable organic peroxide into the propylene polymer. Next, after confirming that the total amount of the impregnated vinyl monomer, radically polymerizable organic peroxide, and radical polymerization initiator is at least 50% by weight, the temperature is lowered to 80~80%.
The temperature was raised to 85° C. and maintained at that temperature for 7 hours to complete polymerization, followed by washing with water and drying to obtain a grafted precursor. The styrene polymer in this grafted precursor was extracted with ethyl acetate, and the number average degree of polymerization was measured by GPC.
It was 0.

Next, this grafted precursor was extruded at 200° C. using a Laboplast Mill-screw extruder (manufactured by Toyo Seiki Co., Ltd.) to cause a grafting reaction, thereby obtaining a multiphase thermoplastic resin A.

This multiphase thermoplastic resin A was examined using a scanning electron microscope rJE.
When observed using OL JSM T300J (manufactured by JEOL Ltd.), it was found to be a multiphase thermoplastic resin in which perfectly spherical resin particles with a particle diameter of 0.3 to 0.5 μm were uniformly dispersed.

At this time, the grafting efficiency of the styrene polymer was 58% by weight.

Reference Example 2 (Production of Multiphase Structure Thermoplastic Resin B) 30 g of maleic anhydride from Reference Example 1 was mixed with 30 g of glycidyl methacrylate.
A multiphase structure thermoplastic resin B was obtained by repeating the operation of Reference Example 1 except that the following was changed.

Reference Example 3 (Production of multiphase structure thermoplastic resin C) 270 g of styrene monomer as the vinyl monomer of Reference Example 1 was mixed with 189 g of styrene monomer and 81 g of acrylonitrile monomer, and 1.5 g benzoyl peroxide
Di-3,5.5-trimethylhexanoyl peroxide [Perloyl 355J (trade name, manufactured by NOF Corporation)
3g, and added α-methylstyrene dimer “Nofmar MSDJ (trade name, Nippon Oil & Fats Co., Ltd.) as a molecular weight regulator.
A multiphase thermoplastic resin C was obtained by repeating Reference Example 1, except that 0.3 g of the resin (manufactured by Co., Ltd.) was used.

At this time, the number average degree of polymerization of the styrene-acrylonitrile polymer was 1200, and the average particle size of the resin dispersed in this resin composition was 0.3 to 0.5 μm.

Examples 1 to 7 Nylon 6.6 "Amilan CM 3001-NJ (trade name, manufactured by Toshiku Co., Ltd.)" and the multiphase thermoplastic resin obtained in Reference Example were melt-mixed in the proportions shown in Table 1.

The melt-mixing method involved tri-blending pellets of each resin, then supplying the pellets to a coaxial twin-screw extruder with a screw diameter of 30 mm set at a cylinder temperature of 280'C, and granulating after extrusion. The granulated resin is heated to 3.
Dry for an hour. Next, a test piece was prepared using an injection molding machine set at a cylinder temperature of 320°C and a mold temperature of 90°C. The size of the test piece is as follows.

Izotsu impact test piece 13mm x 65+nm x
6 holes (with notch) Load deflection temperature test piece 13mm x 130mm
X 6 mm The test method is as follows.

(1) Izot impact value (with notch): JIS K
7110 (2) Weighted deflection temperature: JIS K7207 (3
) Water absorption rate: A test piece was immersed in water at 23°C for 25 days, left at 23°C and 65% relative temperature for 1 day, and determined from the weight change.

(4) Layer peeling condition The double layer peeling condition was determined by visually observing the condition after performing a peel test by attaching an adhesive tape to the fractured surface of the molded product and removing it later, and ranking it as follows.

◎: No peeling at all ○: Slight peeling of solder ×: Peeling Table 2 Examples 8 to 12 The multiphase structure thermoplastic resins of Examples 1 to 7 were added to the grafted precursor obtained in the reference example. Alternative example and average fiber length 5.0m
Table 4 shows an example in which glass fibers with a diameter of 10 μm were blended. Note that the ratio of glass fiber is based on 100 parts by weight of the resin content.

Comparative Examples 1 to 5 Table 3 shows examples in which the propylene polymer used in Reference Example 1 modified with maleic anhydride was used instead of the multiphase thermoplastic resin of the above Examples.

From the above results, the thermoplastic resin composition of the present invention, which is a blend of polyamide resin and specific multiphase thermoplastic resin, has excellent impact resistance, heat resistance, and water resistance as shown in each example. It is an excellent composition. On the other hand, polyamide resin alone (Comparative Example 1) had poor impact resistance and water resistance, maleic anhydride-modified PP alone (Comparative Example 2) had a low deflection temperature under load, and a mixture of polyamide resin and maleic anhydride-modified PP It can be seen that in Comparative Examples 3 to 5, the impact resistance and water resistance were poor, and delamination occurred, resulting in insufficient compatibility between the two.

〔Effect of the invention〕

The thermoplastic resin composition of the present invention has the excellent effect of improving physical properties such as impact resistance and water resistance while maintaining the excellent mechanical properties and heat resistance that are the advantages of polyamide resins. Therefore, it is very useful as automobile parts, electrical/electronic parts, industrial parts, etc.

Claims (1)

[Claims] 1. A thermoplastic resin composition comprising a polyamide resin and a thermoplastic resin with a multiphase structure shown below. Multiphase structure thermoplastic resin: Vinyl copolymer obtained from 5 to 95% by weight of a propylene polymer, an epoxy group-containing vinyl monomer and/or an acid group-containing vinyl monomer, and other vinyl monomers. A thermoplastic resin with a multiphase structure consisting of 95 to 5% by weight of the vinyl monomer and at least one radically polymerizable organic peroxide represented by the following general formula (a) or (b). A grafted precursor obtained by copolymerization in propylene polymer particles or a multiphase structure obtained by melt-kneading this grafted precursor, in which either the propylene polymer or the vinyl copolymer has a particle size of 0. A thermoplastic resin with a multiphase structure forming a dispersed phase of .001 to 10 μm. CH_2=CR_1COO-(CH_2-CHR_2O
)_m--COOOCR_3R_4R_5...(
a) CH_2=CR_6CH_2O-(CH_2-CH
R_7O)_n--COOOCR_8R_9R_1_0
...(b) In the above formulas (a) and (b), R_1
is a hydrogen atom or an alkyl group having 1 to 2 carbon atoms, R_2, R
_7 is a hydrogen atom or a methyl group, R_6 is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, R_3, R_4 and R_8,
R_9 is an alkyl group having 1 to 4 carbon atoms, R_5,
R_1_0 represents an alkyl group having 1 to 12 carbon atoms, a phenyl group, an alkyl-substituted phenyl group, or a cycloalkyl group having 3 to 12 carbon atoms, m is 1 or 2, and n is 0, 1 or 2.