JPH083379A - Propylene-based resin composition - Google Patents

Abstract

PURPOSE:To obtain a propylene-based resin composition to be excellently coated with an urethane-based coating. CONSTITUTION:This resin composition contains (a) 99.9-10 pts.wt. of a primary amino group-containing polypropylene-based resin containing >=0.5X10<-2>meq/g (PP) primary amino group and (b) 0.1-90 pts.wt. of an olefin-based elastomer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propylene resin composition having excellent coatability with respect to urethane paint. The propylene-based resin composition of the present invention is used in the fields of automobile parts, electric appliance parts, machine parts, toys, stationery, daily necessities, etc.
Especially, it is preferably used for applications requiring painting and adhesion.

[0002]

2. Description of the Related Art Propylene-based resins are used in the fields of automobile parts, electric / electronic parts, mechanical parts, etc. because of their excellent balance of properties such as moldability, cost, mechanical properties, chemical resistance and electrical properties. Has been done. However, since the propylene-based resin does not have a polar group in the structure, it has problems in coating film adhesion, adhesiveness, etc., and these are obstacles to the development of new practical applications.

Means for improving the adhesion and adhesion of the coating film of propylene resin include dry methods such as flame treatment method, plasma treatment method, ozone treatment method, corona discharge treatment method, ultraviolet ray or electron beam irradiation treatment method. Wet surface treatment methods such as surface treatment methods, methods using mineral acids such as chromic acid mixture or concentrated sulfuric acid, methods of chemically grafting surface-modifying components onto the surface of the molded body, or surface-modifying layers. A direct coating method such as a primer coating method may be used. However,
These methods were not preferable for implementation because of problems in equipment and productivity.

On the other hand, a copolymer of an unsaturated compound having a polar group and ethylene, a propylene-based polymer modified product of an unsaturated compound having a polar group, or a low molecular weight polymer having a polar group is used as a surface modifier for propylene. Attempts have been made to develop a propylene-based resin having excellent coating film adhesion by blending it with a resin. These methods have high economic value because they do not require pretreatment equipment for coating and processing steps, and have been attracting particular attention in recent years. However, even with these methods, paintability
However, there are drawbacks such as insufficient adhesion, and physical properties such as rigidity, impact resistance, and heat resistance significantly deteriorated due to the blended surface modifier.

A method of reacting a maleic anhydride-modified polypropylene with a diamine compound in order to improve the dyeability of polypropylene is disclosed in Japanese Patent Publication No. 44-1540. Further, JP-B-56-9925 and JP-B-58-8683 disclose a method of adding a diamine compound in order to suppress an irritating odor generated during the production of maleic anhydride. Furthermore, JP-A-3-281608 and JP-A-3-28164
Japanese Patent Publication No. 6 discloses a method of forming a crosslinked structure with a polyvalent amine compound in order to improve the impact resistance of polypropylene. However, the modified polypropylenes according to these inventions have insufficient coating film adhesion.

[0006]

DISCLOSURE OF THE INVENTION The present invention does not impair the property balance of propylene resin such as moldability, cost, mechanical properties, chemical resistance, and electrical properties, and also cleans halogen-based solvents and primers. The purpose of the present invention is to provide a propylene-based resin composition capable of obtaining a strong coating film adhesion force and adhesive force without the need for coating.

[0007]

[Means for Solving the Problems] The present inventors
As a result of studying a propylene-based resin composition having excellent adhesiveness, the inventors have found that the resin composition comprising the following components (a) and (b) can achieve the object, and have reached the present invention. Component (a): Primary amino group content is 0.5 × 10 ^-2 meq /
Included between g (PP) and 10 meq / g (PP)
High-grade amino group-containing polypropylene resin 99.9 to 10
Parts by Weight (b) Component: Olefin Elastomer 0.1-90
Parts by weight The propylene-based resin composition of the present invention exhibits strong coating film adhesion and adhesion without washing with a halogen-based solvent or applying a primer.

The ratio of (a) and (b) for the resin composition of the present invention to develop a strong coating film adhesion force is preferably (b) 1 to 99 to 10 parts by weight with respect to (a). 90 parts by weight. It is more preferable to select from the range of (b) 10 to 70 parts by weight with respect to 90 to 30 parts by weight of (a).
Hereinafter, the components constituting the resin composition of the present invention will be described in detail. (A) Primary amino group-containing polypropylene resin The primary amino group-containing polypropylene resin that constitutes the resin composition of the present invention is, for example, at least one unsaturated carboxylic acid or unsaturated dicarboxylic acid anhydride grafted. It can be obtained by reacting the modified polypropylene (hereinafter referred to as acid-modified polypropylene) with a polyvalent amine compound, and the content of primary amino groups is 0.
5 × 10 ^-2 meq / g (PP) or more, 10 meq / g
If the primary amino group content is (PP) or less and the primary amino group content is within this range, the modified polypropylene obtained by the reaction can be used by blending it with unmodified polypropylene. The primary amino group content shown here is the content of the primary amino group introduced into the polypropylene molecule by a chemical bond, and is the primary amino group contained in the unreacted polyvalent amine compound remaining in the resin composition. Amino groups are excluded. If the primary amino group content is 0.5 × 10 ^-2 meq / g or less, the effect of improving the coatability cannot be obtained, while 10 meq / g (PP)
The above is not preferable because the mechanical strength of the molded product is impaired and many bleeding products are generated on the surface of the molded product. 1
The preferred primary amino group content of the primary amino group-containing polypropylene resin is 0.5 × 10 ^{-2 to 1} meq / g,
More preferably, it is 1 × 10 ^-2 to 50 × 10 ^-2 meq / g.

The method for producing a primary amino group-containing polypropylene resin using acid-modified polypropylene as a raw material will be described in detail below. (A-1) Acid-modified polypropylene The acid-modified polypropylene used for producing the primary amino group-containing polypropylene resin is obtained by grafting unsaturated carboxylic acid or unsaturated dicarboxylic acid anhydride onto polypropylene by a known method. .

The concentration of the unsaturated carboxylic acid group or unsaturated dicarboxylic acid anhydride group contained in the acid-modified polypropylene is 0.01 to 10% by weight, and 0.1 to 5% by weight.
Is particularly preferable. If the component concentration of the unsaturated carboxylic acid group or unsaturated dicarboxylic acid anhydride group is 0.01% by weight or less, the improvement of the coatability and the adhesiveness, which is the object of the present invention, cannot be achieved. On the other hand, if it is 10% by weight or more, the mechanical strength of the finally obtained resin composition is greatly impaired, which is not preferable.

The polypropylene used for producing the acid-modified polypropylene is a homopolymer of propylene or a copolymer of propylene and other α-olefin. Examples of the α-olefin copolymerized with propylene include ethylene, butene-1, pentene-1,2-methylbutene-1,3-methylbutene-1, hexene-1,3-methylpentene-1,4-methylpentene-1,3,3-dimethylbutene. 1, heptene-1, methylhexene-1,
Dimethylpentene-1, trimethylbutene-1, ethylpentene-1, octene-1, methylpentene-1, dimethylhexene-1, trimethylpentene-1, ethylhexene-1, methylethylpentene-1, diethylbutene-1, propylpentene-1, Decene-1, methylnonene-1, dimethyloctene, trimethylheptene-1, ethyloctene-1, methylethylheptene-1,
Examples thereof include diethylhexene-1, dodecene-1, and hexadodecene. These α-olefin and propylene copolymers may be random copolymers or propylene-α-olefin block copolymers. One or two of these α-olefins
It is also possible to use more than one type. Further, the content of α-olefin in polypropylene is preferably 45 mol% or less. Among these, the polypropylene used in the present invention includes propylene homopolymer, crystalline propylene / ethylene block copolymer having an ethylene content of 2 to 40 mol%, and ethylene content of 0.5 to 10
A mol% crystalline ethylene / propylene random copolymer is preferred. Such polypropylene has a temperature of 230 ° C,
Melt index measured with 2.16 kg weight is 0.0
A range of 5 to 100 g / 10 minutes, particularly 0.1 to 40 g / 10 minutes is preferable because of excellent moldability. These polypropylenes may be used alone or in combination of two or more. Such polypropylene can be produced by various methods, for example, it can be obtained by reacting in the presence of a combined catalyst of a solid titanium catalyst component and an organometallic catalyst component.

Examples of the unsaturated carboxylic acid or unsaturated dicarboxylic acid anhydride to be grafted on the acid-modified polypropylene include carboxyl group-containing unsaturated compounds such as acrylic acid, methacrylic acid, crotonic acid, cinnamic acid and itaconic acid. Maleic acid, fumaric acid, itaconic acid, chloromaleic acid, citraconic acid, allyl succinic acid, mesaconic acid,
Dicarboxylic acids such as aconitic acid and their acid anhydrides,
Is mentioned. Of these, maleic anhydride, acrylic acid and methacrylic acid are preferred, and maleic anhydride is most preferred. These monomers may be used alone or in combination of 2
One or more species can be used in combination. In addition, JP-A 1-23
As disclosed in Japanese Patent No. 6214, it is possible to increase the addition amount of unsaturated carboxylic acid or unsaturated dicarboxylic acid anhydride by allowing an unsaturated aromatic monomer to coexist and react at a specific ratio. it can.

Any known method can be used to produce the acid-modified polypropylene used in the present invention. That is, a method of dissolving polypropylene in an organic solvent by heating and reacting an unsaturated carboxylic acid or an unsaturated dicarboxylic acid anhydride in the presence of a radical generator (solution method)
Or a method in which an unsaturated carboxylic acid or an unsaturated dicarboxylic acid anhydride is caused to react with the presence of a radical generator by heating to a temperature above the melting point and melting (melting method), or a radiation grafting method using an electron beam or the like Can be adopted.

In the solution method, it is preferable to use an aromatic solvent such as xylene as the organic solvent, and the reaction temperature is 1
The method is carried out at 00 to 180 ° C., and this method has few side reactions and is characterized in that a modified product to which an unsaturated carboxylic acid or an unsaturated dicarboxylic acid anhydride is uniformly added can be obtained. On the other hand, in the case of the melting method, a Banbury mixer, a kneader,
Using a uniaxial or multiaxial extruder or the like, the reaction can be carried out at a temperature not lower than the melting point of the raw material resin and not higher than 300 ° C. The melting method is easy to operate and can complete the reaction in a short time. At the time of kneading, it is preferable that each resin component is uniformly mixed in advance in the form of powder or pellets by a device such as a tumbler or a Henschel mixer, but if necessary, the mixing is omitted and the kneading devices are separately provided. A method of supplying a fixed amount can also be used.

The radical generator used in the reaction can be appropriately selected from known ones, but organic peroxides are particularly preferable. Preferred examples include benzoyl peroxide,
Dicumyl peroxide, lauroyl peroxide,
2,5-dimethyl-2,5-di- (t-butylperoxy) hexane, 2,5-dimethyl-2,5-di- (t-
Butylperoxy) hexyne-3,1,3-bis (t-
Butylperoxyisopropyl) benzene, 1,1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane, n-butyl-4,4′-bis (t-butylperoxy) valerate, p- Chlorobenzoyl peroxide, 2,4-dichlorobenzoyl peroxide, t-butylperoxyisopropyl carbonate, di-t-butylperoxide, t-butylperoxybenzoate, cumene hydroperoxide, diacetyl peroxide, lauroyl peroxide,
Examples thereof include t-butyl cumyl peroxide.

Further, in order to remove unreacted components (unsaturated carboxylic acid or unsaturated dicarboxylic acid anhydride, radical generator, etc.), by-products such as oligomers and decomposed products thereof from the reaction product, an extruder is used. In the middle of or near the outlet, a method such as suctioning with a vacuum pump through a vent line, or dissolving the reaction product in an appropriate solvent and then depositing it to form the product can be used.

Further, the modified propylene thus obtained is subjected to a heat treatment at a temperature of 60 ° C. or higher, or is evacuated while being melted to remove by-products such as unreacted components, oligomers and decomposition products. You can also (A-2) Production of polypropylene resin containing primary amino group
Manufacturing method Any known method can be used to manufacture a primary amino group-containing polypropylene resin from the above acid-modified polypropylene. That is, a method in which an acid-modified polypropylene and a polyvalent amine compound are heated and dissolved in an organic solvent to cause a reaction (solution method), or a method in which a temperature is raised to a temperature equal to or higher than a melting point to melt and react (a melting method) be able to.

Preferred examples of the polyvalent amine compound used when producing the primary amino group-containing polypropylene resin are ethylenediamine, propylenediamine, tetramethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine and tetraethylenepentamine. , Iminobispropylamine, bis (hexamethylene) triamine, 1,3,6-trisaminomethylhexane, trimethylhexamethylenediamine, bispropylenediamine, diethylaminopropylamine,
And aliphatic amines such as polyoxyalkylene polyamines, menthenediamine, isophoronediamine, bis (4-amino-3-methylcyclohexyl) methane, and alicyclic amines such as 1,3-diaminocyclohexane, meta. Aliphatic aromatic amines such as xylylenediamine, o-, m-, p-phenylenediamine, 4,4'-
Aromatic amines such as diaminodiphenylmethane, diaminodiphenylsulfone, 2,4-diaminoanisole, 2,4-toluenediamine, 2,4-diaminodiphenylamine, and diaminodixylylsulfone. These can be used alone or in combination of two or more.

Further, as the polyvalent amine compound, a polyvalent amine having a structure having a large degree of freedom of molecular motion so that the primary amino group introduced into the resin by a chemical bond can be oriented to the surface of the molded body in a short time. It is particularly preferable to use a compound, and specifically, an aliphatic polyvalent amine compound having one or more ether bonds in the molecule is particularly preferable.
That is, an aliphatic primary diamine or triamine derived from polyethylene glycol, polypropylene glycol, or triol, which is generally called polyoxyalkylene polyamine, is particularly preferable. Among these polyvalent amine compounds, those having a number average molecular weight of 10,000 or less can be preferably used. The number average molecular weight is 100 to 2, from the viewpoints of improved coating adhesion, heat resistance, operability, etc.
000 can be more preferably used.

The amount of the polyvalent amine compound used in the acid-modified polypropylene for obtaining the primary amino group-containing polypropylene resin used in the present invention is within the range of the following formula.

[0021]

[Equation 1]

When the polyvalent amine compound component is blended in such an amount that y / x <1, the primary amino group cannot be substantially introduced, and the effect of improving the coatability and adhesiveness is improved. Does not develop. On the other hand, when the polyvalent amine compound component is blended in an amount such that y / x> 10, not only is it uneconomical, but the resulting propylene-based resin composition contains a large amount of unreacted polyvalent amine compound. Remains, and bleeding occurs on the surface of the molded body, which is not preferable.

In order to obtain practically sufficient coating film adhesion of the obtained molded product, it is more preferable to add the polyvalent amine compound in an amount of 1.5 <y / x. A more preferable amount of the polyvalent amine compound used is 1.5 <y / x <5. (B) Olefin-based Elastomer The olefin-based elastomer constituting the resin composition of the present invention is a copolymer of α-olefins such as ethylene, propylene, butene-1, pentene-1, or the copolymerization of these with a non-conjugated diene. It is united. Incidentally, as the non-conjugated diene, dicyclopentadiene, 1,4-hexadiene, dicyclooctadiene, methylenenorbornene, 5
-Ethylidene-2-norbornene and the like can be mentioned.

Specific examples of the olefin elastomer include ethylene / propylene copolymer rubber, ethylene / butene-1 copolymer rubber, ethylene / propylene / butene-1 copolymer rubber, ethylene / propylene / non-conjugated diene copolymer. Examples thereof include amorphous elastic copolymers containing olefin as a main component, such as rubber, ethylene / butene-1 / non-conjugated diene copolymer rubber, and ethylene / propylene / butene-1 / non-conjugated diene copolymer rubber. These can be used alone or in combination of two or more.

The Mooney viscosity ML _{1 + 4} (100 ° C.) of the above-mentioned olefinic elastomer is 5 to 150, preferably 10 to 120. The iodine value (unsaturation) of the olefin elastomer is preferably 16 or less. Method for Producing Resin Composition To produce the propylene resin composition of the present invention, the above-mentioned components (a) and (b) may be mixed by various means.

There are various methods for producing the propylene resin composition of the present invention. For example, it can be produced by uniformly mixing the components (a) and (b) with a device such as a tumbler or a Henschel mixer, and processing them into a film or a molded product in an extruder or an injection molding machine. . Alternatively, a method (melt kneading method) in which both components are mixed at a temperature of not lower than the melting point of the raw material resin and not higher than 300 ° C. by using a Banbury mixer, a kneader, an extruder or the like can be adopted.

Of these manufacturing methods, the melt-kneading method is convenient because the operation is simple and pelletizing can be performed in a short time. At the time of kneading, it is preferable that the respective components are uniformly mixed in advance with a device such as a tumbler or a Henschel mixer, but if necessary, the mixing can be omitted, and a method of separately supplying a fixed amount to the kneading device can also be used. . It is preferable to use a multi-screw extruder as the kneading device because the reaction can proceed efficiently.

When it is produced by using an extruder, an acid-modified polypropylene is produced by reacting an unsaturated carboxylic acid or its anhydride with polypropylene in the presence of a radical generator before the extruder. By supplying the polyvalent amine compound and the component (b) after the middle stage of the extruder, the propylene resin composition of the present invention can be produced by a single extrusion step. It is extremely useful in terms of cost.

If necessary, a reinforcing material, a filler, a coloring agent (pigment / dye), an ultraviolet absorber, a heat stabilizer, a flame retardant, an antioxidant may be added to the propylene resin composition of the present invention.
An antistatic agent, an antifogging agent, a lubricant, a foaming agent, a plasticizer and the like can be added in a manufacturing process or a subsequent processing process as long as the physical properties of the resin are not impaired. Further, the propylene-based resin composition of the present invention may be blended with other thermoplastic resin having high compatibility with the propylene-based resin composition of the present invention, depending on its use and purpose. Specific examples of this include linear low density polyethylene (LLDPE), low density polyethylene (LDPE), and ultra low density polyethylene (V
LDPE), high density polyethylene (HDPE), polybutene, polyisobutene, poly (4-methyl-1-pentene) and other polymers consisting of one type of monomer, styrene-butadiene (.styrene) block copolymers and hydrogenation thereof. And styrene-isoprene (.styrene) block copolymers and hydrogenated products thereof. These may be used alone or in combination of two or more. The term "copolymer" as used herein means random, block, random block, or graft copolymer. The number average molecular weight of these thermoplastic resins is usually 500 to 500,000, preferably 1,000 to 50,000. The amount of these thermoplastic resins used can be within the range of 0 to 500 parts by weight based on 100 parts by weight of the propylene resin composition of the present invention. Used in the propylene resin composition of the present invention. Reinforcements,
Specific examples of the filler include glass fiber, asbestos fiber,
Reinforcing fibers such as carbon fiber, silica fiber, silica-alumina fiber, alumina fiber, zirconia fiber, boron nitride fiber, silicon nitride fiber, boron fiber, fumed silica, clay (aluminum silicate), glass beads, carbon black, quartz Inorganic fillers such as powder, talc (magnesium silicate), titanium oxide, iron oxide, calcium carbonate, diatomaceous earth and the like can be mentioned.

The fibrous material has an average fiber diameter of 5 to 30 μm,
Fibers having a fiber length of 30 to 50 μm can be used. In particular, glass fibers may be surface-treated with various coupling agents in order to improve interfacial adhesion and dispersibility with the propylene resin composition. The coupling agent usually contains a silane-based or titanium-based coupling agent. The inorganic filler may be used as it is, but for the purpose of improving the interfacial adhesion with the propylene resin composition and also improving the dispersibility, various silane coupling agents, higher fatty acids, higher fatty acid esters, A higher fatty acid amide, a higher fatty acid salt, or one whose surface is treated with another surfactant can be used. The average particle size of the inorganic filler is preferably 5.0 μm or less, more preferably 5.0 μm or less, and the aspect ratio is 5 or less.
That is all. A particularly preferred inorganic filler is talc.

The amount of the reinforcing material and the filler used is 0 to 40 parts by weight based on 100 parts by weight of the propylene resin composition of the present invention. If the reinforcing material and / or the filler are contained in an amount of more than 40 parts by weight, the impact resistance is significantly lowered, which is not preferable. A more preferred range is 5 to 30 parts by weight. These reinforcing materials and fillers can be used alone or in admixture of two or more. In particular, when the inorganic filler and the glass fiber are used in combination, the ratio of the inorganic filler and the glass fiber is 2
80 to 20% by weight of glass fiber is preferable with respect to 0 to 80% by weight.

[0032]

EXAMPLES The present invention will be described more specifically with reference to Examples and Comparative Examples below. The method for producing the primary amino group-containing polypropylene resin used in each example, the molding conditions for the propylene resin composition, and the coating film adhesion evaluation method are as follows. Polypropylene resin containing primary amino group (NH ₂ -P
Production of P) Polypropylene, maleic anhydride, and organic peroxide are blended in the blending amounts shown in the column (I) of Table 1, and melt-kneaded by a twin-screw extruder to graft-modified maleic anhydride. Polypropylene was produced. The amount of maleic anhydride added to the acid-modified polypropylene is determined by reprecipitation purification treatment with xylene / acetone system to remove unreacted maleic anhydride component, and further vacuum drying, and then the purified product is converted into hot xylene. It was determined by dissolution and titration with a sodium methylate standard solution. Further, polyvalent amine compounds are shown in Table 1 for the acid-modified polypropylene obtained.
The primary amino group-containing polypropylene resin was obtained by blending in the blending amount shown in (II) and melt-kneading with a twin-screw extruder. The modified NH ₂ -PP6 is a commercially available maleic anhydride-modified polypropylene wax having a primary amino group content of 0.20 meq / g (Umex 1001, manufactured by Sanyo Chemical Industry Co., Ltd.) and polyvalent amine compound in heated xylene. 90 parts by weight of a polypropylene / ethylene block copolymer (Asahi Kasei Polypro M8840) was added to 10 parts by weight of the reaction product obtained in Example 1 and melt-kneaded by a twin-screw extruder. Primary amino in polypropylene resin containing primary amino group
Quantification of group content The primary amino group in the primary amino group-containing polypropylene resin was quantified by the following procedure. (1) The primary amino group-containing polypropylene resin was dissolved in hot xylene and reprecipitated in methanol for purification. After filtration, the purified sample was vacuum dried at 80 ° C. for 8 hours or more to remove the solvent. This reprecipitation purified sample is designated as a . (2) The primary amino group-containing polypropylene resin was dissolved in hot xylene, and after dissolution, 0.1N hydrochloric acid ethanol solution was gradually added dropwise until the solution became acidic, and the primary amino group was converted to amine hydrochloride. The amine-based polypropylene resin was purified by reprecipitation in methanol to obtain a solid sample. After recovery, vacuum drying was performed at 80 ° C. for 8 hours or more to remove the solvent. This amine hydrochloride sample was b
And (3) Titration of each of sample a and sample b with 0.05 NNa methylate standard solution using phenolphthalene ethanol solution as an indicator to obtain a base equivalent to sample a and a base equivalent to sample b , The primary amino group content in 1 g of the primary amino group-containing polypropylene resin was determined from the difference in the amount of Na methylate used in both cases. The primary amino group content is the sodium methylate equivalent (meq (CH ₃ ONa) /
It is represented by g (resin). Preparation of coating film adhesion evaluation test piece A coating film adhesion evaluation test piece was prepared by the following two methods. (1) Injection molding method Injection molding machine (Autoshot 50
B, manufactured by FANUC Co., Ltd., a molten resin was injected into the mold under the conditions of a cylinder temperature setting of 230 ° C. and a mold temperature setting of 60 ° C. to obtain a flat plate molded body of 100 mm × 100 mm × 2 mm. (2) Melt pressing method Press setting temperature is 200 ° C.,
Molten resin is rolled between PET films (trade name Lumirror, manufactured by Toray Industries, Inc.) to obtain 100 mm × 100 mm × 2 m.
A flat plate molded product of m was obtained. Urethane-based paint adhesion test (1) Pretreatment, baking treatment The surface of a flat plate with a thickness of 2 mm was wiped off with a cloth impregnated with ethanol, 20 to 20.
After drying at 25 ° C for 1 hour or more, two-component urethane paint (Retan PG60, manufactured by Kansai Paint Co., Ltd.)
Was used for spray coating (thickness 30 to 40 μm). Then, after leaving it at 20 to 25 ° C. for 30 minutes, it was baked at 80 ° C. for 1 hour in a hot air circulation dryer. After finishing the baking treatment, the coating film was left for a further 24 hours, and then the coating film adhesion was evaluated by a cross-cut peeling test. (2) Cross- cut peeling test Using a cutter knife, 100 parallel cuts were made by drawing 11 parallel lines perpendicular to the coating film surface at intervals of 1 mm. Cellophane adhesive tape (JIS-Z1522) was sufficiently pressure-bonded on top of it and about 3
It was kept at 0 degree and peeled off at once in front, and the state of the part surrounded by a grid was observed. The results were expressed as the number remaining / 100.

[0033]

Examples 1 to 10 The primary amino group-containing polypropylene resin (a), the olefin elastomer (b), other thermoplastic resin, and talc were compounded in the compounding amounts shown in Table 2, and then mixed by a twin-screw extruder. A propylene-based resin composition was obtained by melt-kneading. These resin compositions were molded by the molding method shown in Table 2, and the adhesiveness of the urethane-based coating composition of the obtained molded body was evaluated. The results are shown at the bottom of Table 2.

[0034]

Comparative Examples 1 to 4 Each component shown in Table 3 was melt-kneaded at 230 ° C. by a twin-screw extruder to produce a propylene-based resin composition, and the obtained resin composition was used to evaluate a coating film. Was molded and the adhesion of the coating film was evaluated. The results are shown at the bottom of Table 3. The abbreviations in Tables 1 to 3 are as follows. Polypropylene ○ Homopolypropylene (PP-1) Asahi Kasei Polypro E1100 MFR: 0.5g / 10min (ASTM D123
8) ○ Polypropylene / ethylene block copolymer (PP-
2) Asahi Kasei Polypro M7100 MFR: 0.5g / 10min (ASTM D123
8) ○ Polypropylene / ethylene random copolymer (PP-
3) Asahi Kasei Polypro E3100 MFR: 0.5g / 10min (ASTM D123
8) ○ Polypropylene / ethylene block copolymer (PP-
4) Asahi Kasei Polypro M8840 MFR: 40g / 10min (ASTM D1238) acid-modified polypropylene wax ○ Sanyo Kasei Umex 1001 (MPP WAX) number average molecular weight 15,000, maleic anhydride addition amount 5w
t% organic peroxide (peroxide) ○ 2,5-dimethyl-2,5-di (t-butylperoxy) hexane maleic anhydride ○ NOF crystal man olefin elastomer ○ ethylene / propylene copolymer rubber (EPR) -1) Exxon Chemical VISTALON 805 Mooney viscosity ML _{1 + 4} (100 ° C.): 53, ethylene content: 77 wt% ○ Ethylene-propylene copolymer rubber (EPR-2) Exxon Chemical VISTALON 878 Mooney viscosity ML _{1 + 4} (100 ° C.) : 76, ethylene content: 54 wt% polyamine compound ○ Mitsuishi Texaco Co., Ltd. Jeffamine D-230 (J
D-230) ○ Mitsuishi Texaco Co., Ltd. Jeffamine D-400 (J
D-400) ○ Mitsuishi Texaco Co., Ltd. Jeffamine T-403 (J
T-403) Other thermoplastic resin ○ High-density polyethylene (HDPE) Asahi Kasei Suntech-HD J340 MFR: 7g / 10min (ASTM D1238) ○ Low-density polyethylene (LDPE) Asahi Kasei Suntech-LD M6520 MFR: 20g / 10min (ASTM D1238) ) Styrene / butadiene / styrene copolymer hydrogenated product (SEBS) Asahi Kasei Tuftec H1052 MFR: 12g / 10min (ASTM D1238) Styrene content: 19wt% Reinforcement material (talc) ○ Nippon Talc Microace p4

[0035]

[Table 1]

[0036]

[Table 2]

[0037]

[Table 3]

[0038]

EFFECTS OF THE INVENTION A molded article made of the propylene resin composition of the present invention has excellent coatability with respect to urethane paint. Urethane-based paints are paints that generally form a coating film by reacting a polyisocyanate and a polyol compound, and there are one-pack type and two-pack type, and there are also powder paints using a block-type isocyanate. The molded product made of the propylene resin composition of the present invention has excellent adhesion to any of these urethane paints.

Further, the resin composition of the present invention exerts its effect on a molded body obtained by any conventionally known molding method, for example, injection molding, compression molding, extrusion molding, sheet molding, blow molding. It can be used as a molded product of various shapes obtained by the above. Therefore, the propylene-based resin composition of the present invention can be preferably used in the fields of automobile parts, electric appliance parts, machine parts, toys, stationery, daily necessities, etc., especially for applications requiring coating / adhesion.

Claims (2)

[Claims] 1. A resin composition comprising the following components (a) and (b): Component (a): Primary amino group content is 0.5 × 10 ^-2 meq /
Included between g (PP) and 10 meq / g (PP)
High-grade amino group-containing polypropylene resin 99.9 to 10
Parts by Weight (b) Component: Olefin Elastomer 0.1-90
Parts by weight 2. A primary amino group-containing polypropylene-based resin has at least one ether bond and two or more ether bonds in the molecule, with respect to modified polypropylene grafted with at least one unsaturated carboxylic acid or unsaturated dicarboxylic acid anhydride. The resin composition according to claim 1, which is a polypropylene resin containing a primary amino group obtained by reacting a polyvalent amine compound having one or more primary amino groups.