JPH06240096A - Thermoplastic resin composition - Google Patents

Abstract

PURPOSE:To obtain a thermoplastic molding material excellent in mechanical strengths and moldability as compared with a conventional known resin composition comprising a propylene polymer and a thermoplastic polyurethane resin, more excellent in especially non-water-absorptivity and heat deformation resistance than a thermoplastic polyurethane resin and more excellent in coatability and flexibility than polypropylene. CONSTITUTION:This resin composition comprises a modified polypropylene prepared by subjecting a molten propylene polymer and an aromatic vinyl monomer, desirably together with a vinyl monomer having a polar functional group (particularly epoxy vinyl monomer or carboxylic vinyl monomer) to a polymerization reaction under melt kneading and a thermoplastic polyurethane resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a modified propylene polymer resin and a thermoplastic polyurethane resin, and has excellent heat distortion resistance, rigidity and moldability, and is also excellent in non-water absorption. It relates to a plastic resin composition.

[0002]

2. Description of the Related Art A thermoplastic polyurethane resin is widely used as a thermoplastic elastomer for various machine parts materials because it has high elasticity, flexibility, wear resistance, cold resistance and strength.

However, thermoplastic polyurethane resins have drawbacks such as insufficient heat resistance and moldability and high water absorption. In particular, the water absorption is a problem, and the water-absorbed thermoplastic polyurethane resin is not preferable because it tends to cause whitening due to the inclusion of bubbles when the molding process is performed. Also, hydrolysis occurs due to water absorption and the mechanical strength is not only extremely lowered. In addition, problems such as dimensional change and deformation also occur.

Since the thermoplastic polyurethane resin has such drawbacks, its application as a thermoplastic elastomer is limited, and it is often impossible to take advantage of the excellent characteristics inherent in the thermoplastic polyurethane resin.

On the other hand, polypropylene has many excellent points such as excellent heat resistance, moldability, hydrolysis resistance, solvent resistance and economical efficiency, and almost no water absorption. However, paintability,
It has the drawback of insufficient flexibility and low temperature impact resistance.

Accordingly, attempts have been made to combine the use of thermoplastic polyurethane resins and polypropylene in order to ameliorate their respective drawbacks. However, even if a thermoplastic polyurethane resin having a high polarity and a polypropylene having a low polarity are simply blended by melt kneading or the like, the compatibility between the two is poor, so that layer delamination occurs and only a product having poor surface gloss and mechanical strength can be obtained. Can not.

Therefore, in order to improve the compatibility with the thermoplastic polyurethane resin, a propylene-based polymer is added to maleic acid, maleic anhydride, in the presence of a radical initiator.
Compositions using a propylene-based polymer modified by melt-kneading polymerization with acrylic acid (Japanese Patent Laid-Open Nos. 2-36248 and 2-120358, etc.) have been proposed.

[0008]

However, since the propylene-based copolymer itself is a radical-disintegrating polymer, when the melt-kneading polymerization with the unsaturated carboxylic acid is carried out in the presence of the radical initiator, the propylene-based copolymer is obtained. There is a problem that the decomposition reaction of coalescence occurs and the original physical properties are degraded. In other words, when trying to increase the unsaturated carboxylic acid addition amount in order to improve the compatibility with the thermoplastic polyurethane resin, it is necessary to increase the amount of the radical initiator, and the accompanying decomposition of the propylene-based polymer causes the heat distortion resistance and the molecular weight to be increased. The decrease in mechanical strength is a problem. vice versa,
If the addition amount of the radical initiator is reduced to suppress the decomposition of the propylene-based polymer, the addition amount of the unsaturated carboxylic acid will decrease, resulting in insufficient compatibility with the thermoplastic polyurethane resin. There is. Therefore, even if the compatibility is improved due to the presence of the modified polypropylene, the effect of improving mechanical properties such as strength is not always sufficient.

The present invention solves the problems of the conventional compositions, further improves the compatibility between the thermoplastic polyurethane resin and polypropylene, and has the excellent high elasticity and abrasion resistance of the thermoplastic polyurethane resin, An object of the present invention is to obtain a resin composition having both the mechanical strength and low water absorption properties of polypropylene.

[0010]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned drawbacks of the conventional method, the present inventors melted a propylene-based polymer and an aromatic vinyl-based monomer in a molten state. It has been found that the above object can be achieved by blending the modified propylene-based polymer resin obtained by kneading and polymerization, and the present invention has been completed.

That is, according to the present invention, a propylene polymer in a molten state and an aromatic vinyl monomer, preferably an aromatic vinyl monomer and a polar functional group-containing vinyl monomer are melt-kneaded and polymerized. A thermoplastic resin composition comprising the resulting modified propylene polymer resin (A) preferably 5 to 95% by weight and the thermoplastic polyurethane resin (B) preferably 95 to 5% by weight. It is provided.

The present invention will be described in detail.

(Constitution) The propylene-based polymer of the present invention is
A propylene homopolymer and a copolymer containing propylene as a main component and another olefin or an ethylenic vinyl monomer (each of which is a copolymer containing propylene at 75% by weight or more), and specifically, isotactic polypropylene, Examples include propylene-ethylene copolymer and propylene-butene copolymer. These propylene-based polymers can also be mixed and used. Further, other polymers can be used as long as the properties of the propylene polymer are not impaired.

As the aromatic vinyl monomer, for example, styrene, methylstyrene, vinyltoluene, vinylxylene, ethylvinylbenzene, isopropylstyrene,
Chlorostyrene, dichlorostyrene, bromostyrene and the like can be mentioned, and they can be used alone or in combination.

Further, it becomes possible to copolymerize with an aromatic vinyl,
Small amounts of other monomers, for example various vinyl cyanides such as acrylonitrile; various vinyl esters such as vinyl acetate; acrylic acid or methacrylic acid or their alkyl or glycidyl esters, and May be used in combination with maleic acid and its esters.

Particularly, the polarity of the graft polymer is increased and the terminal functional group of the thermoplastic polyurethane resin, --N.
It is preferable to use a vinyl monomer having a functional group capable of reacting with a CO group or —OH group together with an aromatic vinyl monomer. The polar functional group-containing vinyl monomer used in combination, copolymerizable epoxy group-containing vinyl monomer, hydroxyl group-containing vinyl monomer, carboxyl group-containing vinyl monomer, oxazoline group-containing vinyl monomer, silyl Examples include group-containing vinyl monomers. Preferably, it is an epoxy group-containing vinyl monomer or a carboxyl group-containing vinyl monomer.

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 and 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 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.

Examples of the silyl group-containing vinyl monomer include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltributoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, vinyltris ( 2-methoxyethoxy) silane and the like can be used alone or in combination.

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.

The amount of the aromatic vinyl monomer added is 50% by weight or less, 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, in order to prevent the modified propylene-based polymer from having a low molecular weight, the aromatic vinyl monomer may be added in an amount at least equal to or more than the addition amount of the polar functional group-containing vinyl monomer, preferably 1 to 5 times. preferable.

The amount of the polar functional group-containing vinyl monomer added is 10% by weight or less, preferably 0.1 to 5% by weight, based on the propylene polymer. If it exceeds 10% by weight, not only the product may have a low molecular weight but also the composition may have adverse effects such as tackiness, water absorption and mechanical properties.

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.
Decomposition temperature to obtain half-life of minutes 130-250 ℃
Is desirable. Specific examples include t-butyl peroctate, bis (t-butyl peroxy) trimethylcyclohexane, cyclohexanone peroxide, benzoyl peroxide, dicumyl peroxide, t-butyl perbenzoate, dimethyl di (t-
Butylperoxy) hexane, dimethyldi (t-butylperoxy) hexyne and the like can be mentioned. The amount of the organic peroxide used is usually 0.1 to 10 parts by weight, preferably 1 to 5 parts by weight, based on 100 parts by weight of the vinyl monomer.

As other additives, polypropylene 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), 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 melt-kneading polymerization reaction of the propylene-based polymer with the aromatic vinyl monomer and the polar functional group-containing vinyl monomer is carried out using a closed container such as a Banbury mixer or a continuous kneader such as an extruder. it can. The extruder is preferable when considering industrial production such as granulation. Further, the twin-screw extruder is easier to control the supply of reactants, kneading, polymerization time and the like.

As a manufacturing method, a powder or pellet-shaped propylene-based polymer is supplied to an extruder and pressurized 1
The crystalline propylene-based polymer is melted by heating at 30 to 250 ° C., the aromatic vinyl monomer and the polar functional group-containing vinyl monomer are melt-kneaded and polymerized, and the strand discharged from the die is cooled, Pellet using a pelletizer.

The aromatic vinyl-based monomer may be mixed with the propylene-based polymer in advance and then supplied to the extruder, or may be supplied to the molten propylene-based polymer using a feeder for liquid. It is good, but it is preferable that the propylene-based polymer is mixed and sufficiently impregnated in advance.

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

As the thermoplastic polyurethane resin in the present invention, a polyurethane resin obtained by reacting a polyisocyanate compound (isocyanate component) and a polyhydroxyl compound (polyol component) can be used. As the polyisocyanate used for producing such a polyurethane resin, those conventionally used for producing polyurethane can be used.

As such polyisocyanate,
Aromatic diisocyanates, aliphatic diisocyanates, alicyclic diisocyanates and modified products of these diisocyanates are included. As specific examples of such a diisocyanate, those described in JP-A-53-42234 can be used. For example, hexamethylene diisocyanate, lysine diisocyanate, isophorone diisocyanate,
Xylene diisocyanate, cyclohexane diisocyanate, toluidine diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, p
-Phenylene diisocyanate, m-phenylene diisocyanate, 1,5-naphthylene diisocyanate and mixtures thereof. Of these, 4,
4'-Diphenylmethane diisocyanate, hexamethylene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate and mixtures thereof are preferred.

Polyhydroxyl compounds used in the production of polyurethanes include polyester polyols, polyether polyols, polybutadiene diols and mixtures thereof.

The polyester polyol referred to here is
Examples thereof include a condensate of polyvalent alcohol and polybasic carboxylic acid, a condensate of hydroxycarboxylic acid and polyvalent alcohol, and the like. Examples of the polyvalent alcohol include ethylene glycol and 1,2-propylene. Glycol, 1,3-propylene glycol, 2,3-butylene glycol, 1,4
-Butylene glycol, 2,2'-dimethyl 1,3-propanediol, diethylene glycol, 1,5-pentamethylene glycol, 1,6-hexamethylene glycol, cyclohexane 1,4-diol, cyclohexane-1,4-dimethanol And the like, or a mixture thereof. Examples of polycarboxylic acids include succinic acid, maleic acid, adipic acid, glutanoic acid, pimelic acid, speric acid, azelaic acid, sebacic acid, phthalic acid, isophthalic acid, terephthalic acid, hexahydroterephthalic acid, and hexahydroisophthalic acid. Examples include dibasic acids. As the condensate of hydroxycarboxylic acid and polyhydric alcohol, castor oil, and reaction products of castor oil and ethylene glycol, propylene glycol and the like are also useful. Further, as the polyester polyol, polycaprolactone diols obtained by ring-opening addition polymerization of a lactone such as ε-caprolactone in the presence of glycol or the like can also be used.

The polyether polyol is a product obtained by addition-polymerizing one or more alkylene oxides such as ethylene oxide, propylene oxide, butylene oxide, and tetrahydrofuran with a compound having two or more active hydrogens. For example, polyethylene glycol, polypropylene glycol, polytetramethylene glycol, etc. can be mentioned. Examples of the compound having two or more active hydrogens include, for example, the above-mentioned polyvalent alcohols and polybasic carboxylic acids, amines such as ethylenediamine and hexamethylenediamine,
Examples thereof include alkanolamines such as ethanolamine and propanolamine, polyhydric phenols such as resorcinol and bisphenol, and castor oil.

The polyhydroxyl compound is one or two of polyester polyol and polyether polyol.
It is also possible to use two or more species, and further use a low molecular weight polyhydroxyl compound such as the above-mentioned polyhydric alcohol as a chain extender.

The composition of the present invention contains the modified propylene polymer (A) in an amount of 5 to 95% by weight, preferably 20 to 85% by weight, and the thermoplastic polyurethane resin (B) in an amount of 95 to 5% by weight, preferably 80 to It is 15% by weight. If the amount of the modified propylene polymer in the composition is less than 5% by weight, the modified propylene polymer cannot provide the effect of improving the low water absorption and the molding processability. On the other hand, when the content of the thermoplastic polyurethane resin is less than 5% by weight, the effect of improving the abrasion resistance, mechanical properties, heat distortion resistance and the like due to the thermoplastic polyurethane resin cannot be obtained.

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, the addition may be carried out after first mixing with the modified propylene-based polymer or during mixing with the thermoplastic polyurethane resin, but the amount of unmodified polypropylene added is 900 parts or less based on 100 parts of the modified propylene-based polymer. Should. Other additional components are, for example, other thermoplastic resins, rubber, inorganic fillers, pigments, various stabilizers (antioxidants, light stabilizers, antistatic agents, antiblocking agents, lubricants) and the like.

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 by a kneading machine such as a single-screw or twin-screw extruder, a roll, a Banbury mixer, pelletized or pulverized, and then subjected to molding. Molding is injection molding, hollow molding,
Any method such as extrusion molding can be adopted.

By doing so, the composition of the present invention is
It is possible to obtain a thermoplastic resin composition having a good balance of non-water absorption, heat resistance, rigidity, moisture resistance, paintability and surface property.

[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.

Reference Example 1 Production of Modified Polypropylene 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. Hipol B200P (powdered polypropylene, manufactured by Mitsui Petrochemical Co., Ltd.) and 930 parts of Irganox 1010 (stabilizer manufactured by Ciba-Gaiki)
0.5 part, phosphite 168 (stabilizer manufactured by Ciba-Gaiki) 0.5 part, and calcium stearate (stabilizer) 1 part were mixed. Perhexin 25B (manufactured by NOF CORPORATION) 2.1 in 50 parts of styrene and 20 parts of glycidyl methacrylate 2.1
The mixed parts were added to the powdered polypropylene formulation above and mixed and impregnated in a Henschel mixer. The obtained impregnated blend was supplied to an extruder, melt-kneaded at 15 rpm to perform a graft reaction, and 960 parts of product pellets were obtained through a pelletizer. Hereinafter, this is referred to as modified PP-1.

Reference Example 2 Production of Modified Polypropylene 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. Hipol B200P (powdered polypropylene, manufactured by Mitsui Petrochemical Co., Ltd.) and 930 parts of Irganox 1010 (stabilizer manufactured by Ciba-Gaiki)
0.5 part, phosphite 168 (stabilizer manufactured by Ciba-Gaiki) 0.5 part, and calcium stearate (stabilizer) 1 part were mixed. A mixture of 55 parts of styrene and 25 parts of methacrylic acid with 2.1 parts of Perhexin 25B (manufactured by NOF CORPORATION) was added to the above powdered polypropylene compound and mixed and impregnated with a Henschel mixer. The obtained impregnated blend was supplied to an extruder, melt-kneaded at 15 rpm to perform a graft reaction, and 960 parts of product pellets were obtained through a pelletizer. Hereinafter, this is referred to as modified PP-2.

Reference Example 3 Production of Modified Polypropylene 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. Hipol B200P (powdered polypropylene, manufactured by Mitsui Petrochemical Co., Ltd.) and 930 parts of Irganox 1010 (stabilizer manufactured by Ciba-Gaiki)
0.5 part, phosphite 168 (stabilizer manufactured by Ciba-Gaiki) 0.5 part, and calcium stearate (stabilizer) 1 part were mixed. A mixture of 20 parts of glycidyl methacrylate and 0.6 parts of Perhexin 25B (manufactured by NOF CORPORATION) was added to the above powdered polypropylene compound and mixed and impregnated with a Henschel mixer. The obtained impregnated blend was supplied to an extruder, melt-kneaded at 15 rpm to carry out a graft reaction, and 910 parts of product pellets were obtained through a pelletizer. Hereinafter, this is referred to as modified PP-3.

(Example 1) Brabender (Germany)
A Brabender Plastograph roller mixer manufactured by Kuraray Co., Ltd. was set so that the temperature of the mixer section was 200 ° C. 16 parts by weight of (modified PP-1) obtained in Reference Example 1 and Pandex T-1190 (adipate thermoplastic urethane TPU-1 manufactured by Dainippon Ink and Chemicals, Inc.) 24
5 parts by weight is supplied to the mixer at a rotation speed of 40 rpm.
Kneading was performed for a minute. The melt-kneaded product thus obtained was molded using a hydraulic press at 190 ° C. under the conditions of 150 kg / cm ² to obtain a test piece having a thickness of 1 mm. The viscoelasticity of the test piece was measured using "Rheometrics RSA11" (manufactured by Rheometrics) under the condition of 6.28 rad / sec from room temperature to 200 ° C, and the dynamic modulus of elasticity at 30 ° C was calculated as the rigidity. At the same time, the temperature at which the dynamic elastic modulus becomes 3.0 × 10 ⁹ dyne / cm ² or less was obtained as the heat deformability. As a physical property target, the rigidity is 4.0 × 10 ⁹ dyne /
cm ² or more, and the heat distortion temperature was 140 ° C. or more. Further, the test piece was cut into a strip having a width of 25 mm and subjected to a 180-degree bending test, and the flexibility and the presence or absence of delamination were visually judged. Next, in order to evaluate the water absorption, the pressed test piece (20 × 5
(0 × 1 mm) was immersed at 70 ° C. for 1 hour, and the water absorption was calculated by the following formula. The target of water absorption depends on the usage ratio of thermoplastic urethane, but was set to 0.6% or less. The results of physical property measurements are shown in Table 1.

[0045] Comparative Example 1 The same operation as in Example 1 was performed except that 24 parts by weight of Hypol B200 (polypropylene, manufactured by Mitsui Petrochemical Co., Ltd.) was used instead of 16 parts by weight of (modified PP-1) in Example 1. A test piece was obtained. Thereafter, the physical properties were evaluated in the same manner as in Example 1. The results of physical property measurements are shown in Table 1.

(Comparative Example 2) In Example 1, (modified PP
-1) The same operation as in Example 1 was carried out except that 16 parts by weight of (modified PP-3) obtained in Reference Example 3 was used instead of 16 parts by weight to obtain a test piece. Thereafter, the physical properties were evaluated in the same manner as in Example 1. The results of physical property measurements are shown in Table 1.

(Comparative Example 3) In Example 1, (modified PP
-1) Instead of using 16 parts by weight, Admer QF54
A sample was obtained in the same manner as in Example 1 except that 16 parts by weight of 0 (commercially available carboxylic acid-modified polypropylene; manufactured by Mitsui Petrochemical Industry Co., Ltd.) was used. Thereafter, the physical properties were evaluated in the same manner as in Example 1. The results of physical property measurements are shown in Table 1.

[0048]

[Table 1]

(Example 2) In Example 1, (modified PP
-1) Instead of using 16 parts by weight, 24 parts by weight were used, and instead of using 24 parts by weight of Pandex T-1190 (adipate thermoplastic urethane TPU-1 manufactured by Dainippon Ink and Chemicals, Inc.) 16 parts by weight A sample was obtained in the same manner as in Example 1 except that parts by weight were used. Thereafter, the physical properties were evaluated in the same manner as in Example 1. The results of physical property measurements are shown in Table 2.

(Example 3) In Example 1, (modified PP
-1) A test piece was obtained in the same manner as in Example 1 except that 16 parts by weight of (modified PP-2) obtained in Reference Example 2 was used instead of 16 parts by weight. Thereafter, the physical properties were evaluated in the same manner as in Example 1. The results of physical property measurements are shown in Table 2.

(Example 4) In Example 1, (modified PP
-1) Instead of using 16 parts by weight, (modified PP-1)
8 parts by weight and 8 parts by weight of Hypol B200 (polypropylene, manufactured by Mitsui Petrochemical Co., Ltd.), and Pandex T-
A sample was obtained in the same manner as in Example 1, except that 24 parts by weight of 2190 (lactone type thermoplastic urethane, TPU-2 manufactured by Dainippon Ink and Chemicals, Inc.) was used. Thereafter, the physical properties were evaluated in the same manner as in Example 1. The results of physical property measurements are shown in Table 2.

COMPARATIVE EXAMPLE 4 Instead of using the modified propylene polymer and the thermoplastic polyurethane resin in the preparation of the composition of Example 1, PANDEX T was used for the purpose of physical properties.
-1190 (thermoplastic polyurethane resin, abbreviated as TPU-1 manufactured by Dainippon Ink and Chemicals, Inc.) was used alone to prepare a composition, and various physical properties were evaluated in the same manner as in Example 1. The results are shown in Table 2.

[0053]

[Table 2]

[0054]

INDUSTRIAL APPLICABILITY The present invention relates to an aromatic vinyl monomer and a polar functional group-containing vinyl monomer (particularly an epoxy group-containing vinyl monomer or a carboxyl group-containing vinyl monomer) in a molten propylene polymer. A composition comprising a modified polypropylene obtained by a melt-kneading polymerization reaction in combination with a thermoplastic polyurethane resin, which has excellent mechanical strength and moldability, and is particularly superior to thermoplastic polyurethane resin in non-water absorption and heat deformability. It is possible to provide a thermoplastic molding material which is excellent in paintability and flexibility and has good physical property balance such as being superior to polypropylene.

Claims (5)

[Claims] 1. A modified propylene polymer resin (A) and a thermoplastic polyurethane resin (B) obtained by melt-kneading and polymerizing a molten propylene polymer and an aromatic vinyl monomer. A thermoplastic resin composition comprising: 2. A modified propylene polymer resin (A) and a thermoplastic polyurethane resin (B) in a weight ratio of 5: 95-.
It is 95: 5, The thermoplastic resin composition of Claim 1 characterized by the above-mentioned. 3. A modified propylene-based polymer resin (A) is obtained by melt-kneading a propylene-based polymer in a molten state, an aromatic vinyl-based monomer, and a polar functional group-containing vinyl monomer in a kneading polymerization reaction. 1 or 2 characterized in that
The thermoplastic resin composition described. 4. The thermoplastic resin composition according to claim 3, wherein the polar functional group-containing vinyl monomer is an epoxy group-containing vinyl monomer. 5. The thermoplastic resin composition according to claim 3, wherein the polar functional group-containing vinyl monomer is a carboxyl group-containing vinyl monomer.