JP2010229202A - Resin composition and resin compatibilizer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polyolefin-polyester resin composition exhibiting excellent compatibility. <P>SOLUTION: The resin composition comprises (A) a resin component comprising a polyolefin and a polyester, (B) a resin compatibilizer comprising a polymer chain compose of a polymer compatible with the polyolefin, the polymer chain having one or two or more functional groups selected from carboxylic acid groups and carboxylic acid salt groups incorporated therein. Preferably, the content of the component (B) is within the range of 0.1-40 pts.mass based on 100 pts.mass component (A). Preferably, the content of the functional groups in the component (B) is within the range of 0.1-20 mass%. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a resin composition and a resin compatibilizer, and more particularly to a resin composition and a resin compatibilizer suitable as an insulating coating material for insulated wires used in automobiles, electric / electronic devices, and the like. It is.

  Conventionally, it has been attempted to construct a resin composition having an excellent balance of desired physical properties by blending different types of resins. For example, by blending polyolefins such as polyethylene and polypropylene and polyesters such as polyethylene terephthalate and polybutylene terephthalate, a highly practical resin composition with excellent moldability, chemical resistance, heat resistance, mechanical strength, etc. Attempts have been made to build things.

  However, different types of resins are often difficult to mix with each other. For example, polyolefin and polyester are difficult to mix with each other because polyolefin is a hydrocarbon-based nonpolar polymer whereas polyester is a polar polymer having a polar group such as a carbonyl group or a hydroxyl group.

  Therefore, in order to construct a good composite material obtained by blending different types of resins, it is required to improve the compatibility of the different types of resins. As a method for improving the compatibility, there is a method of adding a compatibilizing agent.

  The characteristics of the compatibilizer include 1) solubility in any of the blended resins, 2) reactivity in any of the blended resins, and 3) some of the blended resins. Three characteristics are considered: solubility and reactivity to other resins.

  The characteristic 1) is not accompanied by any reaction with the resin to be blended, so that the effect of improving the compatibility is relatively low. Property 2) may be lacking in applicability when polyolefin and polyester are blended because some polyolefins do not have reactive functional groups. Therefore, when blending polyolefin and polyester, characteristic 3) is most suitable. Therefore, in this case, a compatibilizing agent that is soluble in polyolefin and reactive in polyester can be expected to have the highest effect as a compatibilizing agent.

  As an example using such a compatibilizing agent, for example, Patent Document 1 discloses a resin composition obtained by melt-kneading a polyester resin, a polyolefin resin, and an epoxy group-containing ethylene copolymer.

Japanese Patent Laid-Open No. 2000-129099

  However, in the conventional resin composition, the compatibility between the polyolefin and the polyester is not sufficient. Therefore, the obtained resin composition has insufficient mechanical properties such as wear resistance. This is presumably because the epoxy group-containing ethylene copolymer has high reactivity with polyester, so that compatibility with polyester becomes too high, it is unevenly distributed on the polyester side, and compatibility with polyolefin cannot be fully exhibited.

  The problem to be solved by the present invention is to provide a resin composition having excellent compatibility between polyolefin and polyester. Another object is to provide a resin compatibilizer capable of improving the compatibility between polyolefin and polyester.

  As a result of intensive studies by the present inventors, the present invention was completed by obtaining the knowledge that the balance between the reactivity of the resin compatibilizer with polyester and the compatibility with polyolefin is important.

  In order to solve the above problems, a resin composition according to the present invention comprises (A) a resin component containing polyolefin and polyester, (B) a polymer chain composed of a polymer compatible with the polyolefin, and the polymer chain. The gist of the invention is to contain a resin compatibilizer having one or two or more functional groups selected from a carboxylic acid group and a carboxylic acid group introduced.

  At this time, the content of the functional group of the component (B) is preferably in the range of 0.1 to 20% by mass. The component (B) is preferably in the range of 0.1 to 40 parts by mass with respect to 100 parts by mass of the component (A). Furthermore, the polymer chain of the component (B) is preferably made of polyolefin. The polyester as the component (A) is preferably a polycondensate of a polyvalent carboxylic acid and a polyhydric alcohol.

  Further, the resin compatibilizer according to the present invention is a polymer chain made of a polymer compatible with polyolefin, and one kind selected from a carboxylic acid group and a carboxylic acid group introduced into the polymer chain, or The gist is to have two or more functional groups.

  According to the resin composition of the present invention, a resin compatibilizing agent in which a carboxylic acid group or a carboxylate group is introduced into a polymer chain made of a polymer compatible with polyolefin is added to a resin component containing polyolefin and polyester. Since it is added, the compatibility between polyolefin and polyester is improved, and mechanical properties such as wear resistance are excellent.

  This is because the functional group of the resin compatibilizer is a carboxylic acid group or a carboxylate group, and the reactivity of the functional group with respect to the polyester is relaxed to such an extent that the polyester is not denatured. This is presumably because the balance between the reactivity with respect to styrene and the compatibility with polyolefin was improved.

  Under the present circumstances, when content of the functional group of (B) component exists in a specific range, it is excellent in especially compatibility of polyolefin and polyester. Moreover, when the compounding ratio of (A) component and (B) component exists in a specific range, it is excellent in especially the compatibility of polyolefin and polyester. Further, when the polymer chain of the component (B) is made of polyolefin, the compatibility between the polyolefin in the component (A) is excellent and the compatibility between the polyolefin and the polyester is further improved.

  The resin compatibilizer according to the present invention has a structure in which a carboxylic acid group or a carboxylic acid group is introduced into a polymer chain made of a polymer that is compatible with polyolefin. Compatibility can be improved. Thereby, the polyolefin-polyester-type resin composition excellent in mechanical characteristics, such as abrasion resistance, can be obtained.

  Next, an embodiment of the present invention will be described in detail. The resin composition according to the present invention is a blend of polyolefin and polyester, and contains a resin component containing polyolefin and polyester and a specific resin compatibilizing agent.

  Examples of polyolefin include polyethylene, polypropylene, ethylene-α olefin copolymer, ethylene-vinyl ester copolymer, ethylene-α, β-unsaturated carboxylic acid alkyl ester copolymer, olefin-based thermoplastic elastomer, olefin-based rubber, etc. Is mentioned.

  Examples of the polyethylene include low-density polyethylene, ultra-low-density polyethylene, linear low-density polyethylene, high-density polyethylene, and metallocene-polymerized polyethylene by high-pressure radical polymerization. Examples of polypropylene include homopolypropylene, block polypropylene, and random polypropylene.

  As an alpha olefin of an ethylene-alpha olefin copolymer, a C3-C20 alpha olefin etc. are mentioned. More specifically, the α-olefin includes propylene, 1-butene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, 1-tridecene, 1 -Tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, 1-nonadecene, 1-eicocene, 9-methyl-1-decene, 11-methyl-1-dodecene, 12-ethyl-1 tetradecene and the like.

  Examples of the vinyl ester of the ethylene-vinyl ester copolymer include vinyl propionate, vinyl acetate, vinyl caproate, vinyl caprylate, vinyl laurate, vinyl stearate, vinyl trifluoroacetate, and the like.

  Examples of the α, β-unsaturated carboxylic acid alkyl ester of the ethylene-α, β-unsaturated carboxylic acid alkyl ester copolymer include methyl acrylate, methyl methacrylate, ethyl acrylate, and ethyl methacrylate. .

  Examples of the olefin rubber include ethylene propylene rubber, butadiene rubber, and isoprene rubber.

  Examples of the ethylene-propylene rubber include a random copolymer mainly composed of ethylene and propylene, and a random copolymer composed mainly of a diene monomer such as dicyclopentadiene or ethylidene norbornene as a third component. Can be mentioned.

  Examples of butadiene rubbers include styrene-butadiene block copolymers and hydrogenated or partially hydrogenated derivatives of styrene-ethylene-butadiene-styrene copolymers, 1,2-polybutadiene, maleic anhydride modified styrene-ethylene- Examples thereof include a butadiene-styrene copolymer and a modified butadiene rubber having a core-shell structure.

  Isoprene-based rubbers include styrene-isoprene block copolymers and styrene-ethylene-isoprene-styrene copolymers that are hydrogenated or partially hydrogenated derivatives thereof, maleic anhydride modified styrene-ethylene-isoprene-styrene copolymers. And modified isoprene rubber having a core-shell structure.

  Examples of the polyester include polycondensates of polycarboxylic acids and polyhydric alcohols, polycondensates of hydroxycarboxylic acids, polycondensates of polycarboxylic acids, polyhydric alcohols and hydroxycarboxylic acids. When the polyester is composed of a polycondensate containing a trivalent or higher carboxylic acid or a trivalent or higher alcohol, a polyester having a three-dimensional structure can be obtained.

  More specifically, examples of the polyester include polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene naphthalate (PBN), and poly 1 , 4-cyclohexyldimethylene terephthalate (PCT) and the like.

  The blending ratio of polyolefin and polyester may be appropriately selected according to desired physical properties, but is preferably in the range of polyolefin / polyester = 20/80 to 80/20 by mass ratio.

  The resin compatibilizing agent of the present invention has a polymer chain composed of a polymer compatible with the resin component polyolefin and a specific functional group introduced into the polymer chain. The resin compatibilizing agent of the present invention exhibits compatibility with the polyester by reacting the specific functional group with the polyester of the resin component. At this time, if the reactivity to the polyester is too high, the resin compatibilizer is unevenly distributed on the polyester side, and the balance between the reactivity of the resin compatibilizer with the polyester and the compatibility with the polyolefin is deteriorated, and the compatibility between the polyolefin and the polyester becomes poor. In the present invention, focusing on the reactivity between the functional group introduced into the resin compatibilizing agent and the polyester of the resin component, a specific functional group that reacts with the polyester to such an extent that the polyester is not modified. Has been introduced.

  The reactivity of the resin compatibilizer with respect to polyester can be determined by conducting thermal analysis (DSC measurement) on a resin composition in which a resin component containing polyolefin and polyester and a resin compatibilizer are kneaded. That is, when the reactivity of the resin compatibilizer with respect to the polyester is low, the crystallization peak temperature of the polyester hardly changes in the thermal analysis (DSC measurement). In addition, when the resin compatibilizer acts as a polyester modifier and changes the physical properties of the polyester itself, the crystallization peak temperature of the polyester greatly changes in thermal analysis (DSC measurement). Therefore, the reactivity of the resin compatibilizer with respect to the polyester may be focused on the change in the crystallization peak temperature of the polyester in the thermal analysis (DSC measurement).

  On the other hand, the compatibility between the polyolefin and the polyester can also be determined by conducting thermal analysis (DSC measurement) on the resin composition. That is, when an interaction occurs between the polyolefin and the polyester that exist independently, the size of the crystallization peak of the polyester (crystallization energy) decreases, so the change in the size of the crystallization peak of the polyester You should pay attention to.

  From the relationship between the change in the crystallization peak temperature of the polyester and the change in the size of the crystallization peak of the polyester, the reactivity of the resin compatibilizer with the polyester affects the compatibility between the polyolefin and the polyester. I understand that. Then, by reacting with the polyester to such an extent that the resin compatibilizer does not denature the polyester, the reactivity of the resin compatibilizer with respect to the polyester and the compatibility with the polyolefin are improved, and the compatibility between the polyolefin and the polyester is improved.

  As described above, from the viewpoint of reactivity with polyester, specific functional groups (hereinafter simply referred to as functional groups) are carboxylic acid groups and carboxylic acid groups, and acid anhydride groups are excluded. The functional group may be one of these or a combination of two or more. The functional group may be at the end of the polymer chain, at the side chain of the polymer chain, or at both the end of the polymer chain and the side chain. The functional group may be introduced into the polymer chain by directly bonding to carbon of the polymer chain, an alkyl chain having 1 to 50 carbon atoms, another polymer chain having a molecular weight of 100 to 1,000,000, an amide bond, It may be introduced via an ether bond, an ester bond, or a combination thereof.

  Examples of a method for introducing a functional group into a polymer chain include a graft method and a copolymerization method. In the grafting method, a polymer having a functional group such as polyacrylic acid can be introduced into the polyolefin, or a monomer having a functional group such as vinyl carboxylic acid can be introduced into the polyolefin. In the copolymerization method, a monomer having a functional group such as vinyl carboxylic acid and an olefin monomer can be copolymerized.

  In any of the grafting and copolymerization methods, a monomer or polymer having an acid anhydride structure such as maleic anhydride is introduced into the polyolefin, and then the acid anhydride group is hydrolyzed to produce a carboxylic acid group or a carboxylic acid group. You may make it produce an acid base.

  Examples of the polymer to be introduced in the graft method include poly (meth) acrylic acid or a polymer obtained by copolymerizing them. Examples of the monomer introduced in the graft method or copolymerization method include (meth) acrylic acid and maleic anhydride.

  The amount of the functional group in the molecular structure of the resin compatibilizer is not particularly limited, but is preferably in the range of 0.1 to 20% by mass. More preferably, it exists in the range of 0.5-10 mass%. When the amount of the functional group is less than 0.1% by mass, the number of reaction sites that react with the polyester of the resin component is too small, and the compatibility with the polyester tends to be low. On the other hand, when the amount of the functional group exceeds 20% by mass, the amount of the functional group is too large, so that the compatibility of the resin component with the polyolefin tends to decrease. Therefore, the compatibility effect tends to be low.

  Although content of the resin compatibilizer in a resin composition is not specifically limited, It is preferable to exist in the range of 0.1-40 mass parts with respect to 100 mass parts of resin components. More preferably, it exists in the range of 1-30 mass parts with respect to 100 mass parts of resin components, More preferably, it exists in the range of 5-20 mass parts with respect to 100 mass parts of resin components. If the content of the resin compatibilizer is less than 0.1 parts by mass, the content of the resin compatibilizer is too small, and the compatibility effect tends to be low. On the other hand, when the content of the resin compatibilizer exceeds 40 parts by mass, the content of the resin compatibilizer is too large, and it is difficult to obtain a polyolefin-polyester resin composition having desired physical properties. When the content of the resin compatibilizer is in the range of 1 to 30 parts by mass, particularly in the range of 5 to 20 parts by mass, the compatibility effect is further improved.

  The polymer constituting the polymer chain of the resin compatibilizer is preferably a polyolefin. Examples of the polyolefin constituting the polymer chain of the resin compatibilizer include the same polyolefins as those described above for the resin component polyolefin. In particular, the same type of polyolefin as the resin component polyolefin is preferred.

  When the structure of the resin compatibilizing agent according to the present invention is represented by a chemical structural formula, for example, the following formula 1 is obtained.

(Formula 1)
R1-R2-R3

  In Formula 1, R1 represents polyolefin such as polypropylene or polyethylene. R2 represents an alkyl group having 1 to 50 carbon atoms or a polymer having a molecular weight of 100 to 1,000,000. The alkyl group or polymer may contain a hydroxyl group, an amide bond, an ether bond, an ester bond, or a carbonyl group. R3 represents a carboxylic acid group or a salt thereof.

  Specific examples of the compound suitable as the resin compatibilizer according to the present invention include, for example, propylene- (meth) acrylic acid copolymer, ethylene- (meth) acrylic acid copolymer, (meth) acrylic acid-modified polypropylene, Examples include (meth) acrylic acid-modified polyethylene, maleic acid-modified polypropylene, and maleic acid-modified polyethylene.

  In the present invention, other resin components and additives can be blended as long as the characteristics are not impaired. Additives include flame retardants such as metal hydrates, antioxidants, metal deactivators (copper damage inhibitors), UV absorbers, UV masking agents, flame retardant aids, processing aids (lubricants, waxes) Etc.), fillers, carbon and other pigments for coloring, etc., and additives generally used for resin molding materials. Moreover, you may bridge | crosslink the resin composition of this invention as needed. Examples of the cross-linking means include peroxide cross-linking, silane cross-linking, electron beam cross-linking and the like, but the method is not limited.

  The resin composition according to the present invention is, for example, polyolefin, polyester, resin compatibilizer, optional resin component, optional additive component such as a Banbury mixer, a pressure kneader, a kneading extruder, a twin-screw kneading extruder, a roll, etc. It can be prepared by melt-kneading with a normal kneader and dispersing uniformly.

  Thus, in the present invention, the resin compatibilizing agent has a polymer chain made of a polymer that is compatible with the resin component polyolefin, and a specific functional group introduced into the polymer chain. The reactivity of the resin compatibilizer with respect to the polyester is suppressed to such an extent that the polyester is not modified. As a result, the uneven distribution of the resin compatibilizer on the polyester side is suppressed due to the compatibility of the polymer chain with the polyolefin, and the balance of the reactivity of the resin compatibilizer with the polyester and the compatibility with the polyolefin is excellent. Thereby, the compatibility of polyolefin and polyester improves.

  The resin composition according to the present invention includes general plastic materials, interior and exterior materials, protective materials, resins intended for electrical insulation, etc., and masterbatches thereof, for example, automotive interior and exterior resins and protective materials, insulation. It can be suitably used as a coating material for electric wires and optical communication fibers.

  EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto.

(Synthesis of resin compatibilizer)
<Synthesis of Compound A>
100 g of maleic anhydride-modified polypropylene (Sumyo Kasei Co., Ltd., Yumex 1010) was dissolved in 1 L of hot xylene, and 1 L of 1% sodium hydroxide solution was added thereto. The mixture was stirred overnight at 80 ° C. while being separated into two phases. Thereafter, the mixture was cooled to room temperature, and the aqueous phase was adjusted to pH 2 with 1 mol / L hydrochloric acid. The xylene phase was separated with a separatory funnel and washed twice with 1 L of pure water, and then the xylene phase was poured into 2 L of methanol with stirring to allow crystallization. The crystallized product was collected by filtration, washed twice with pure water, and then dried to obtain 90 g of a yellow polymer.

<Synthesis of Compound B>
Synthesis was carried out in the same manner as Compound A except that maleic anhydride-modified polyethylene (manufactured by Aldrich) was used in place of maleic anhydride-modified polypropylene.

(Preliminary study)
The reactivity of various resin compatibilizers to polyester was examined by thermal analysis. Specifically, 10 parts by mass of a resin compatibilizer is added to a resin component consisting of 60 parts by mass of polypropylene (manufactured by Prime Polymer Co., Prime Polypro E150GK) and 40 parts by mass of PBT (manufactured by Toray Industries, Inc., Toraycon 1401X06). It mixed with the shaft kneader. About each obtained resin composition, the crystallization peak temperature and crystallization energy of PBT were measured by DSC measurement. The DSC measurement was performed under the condition that 5 mg of the sample piece was once melted at 300 ° C. and the temperature was lowered at a rate of 10 ° C./min. The results are shown in Table 1.

  From the results of DSC measurement, when epoxy group-containing PE (GMA-PE) was used, the crystallization peak temperature of PBT changed greatly, and the physical properties of PBT itself were changed (by modifying PBT) It is inferred. At this time, since the crystallization energy of PBT is hardly changed, it is presumed that the compatibility effect of compatibilizing polypropylene and PBT is not so great. Therefore, when the epoxy group-containing PE is used, the reactivity with the polyester is high, so that the compatibility with the polyester becomes too high and the compatibility with the polyolefin is lowered. It is presumed that the original compatibility effect of melting is not sufficient.

  When maleic anhydride-modified PP (MAH-PP) is used, the crystallization peak temperature of PBT is hardly changed and PBT is not denatured, but it is presumed that the reactivity to PBT is low. The At this time, since the crystallization energy of PBT is not changed so much, when maleic anhydride-modified PP is used, the compatibility with polypropylene and PBT is not so much as a result of low reactivity with PBT. It is assumed that it is not big.

  When maleic acid-modified PP (compound A), maleic acid-modified PE (compound B), and acrylic acid-modified PP (AA-PP) were used, the crystallization peak temperature of PBT was slightly changed, It is presumed that it reacts with PBT to such an extent that PBT is not denatured. At this time, the crystallization energy of PBT is greatly reduced, and it is presumed that the compatibility effect of compatibilizing polypropylene and PBT is great.

(Examples 1 to 10)
After mixing a resin component, a resin compatibilizing agent, and an additive at an arbitrary temperature using a twin-screw kneader so as to have the component composition (parts by mass) shown in Table 2, pellets are formed with a pelletizer. The resin composition pellets were obtained. The pellets were extruded with an extrusion molding machine to a thickness of 0.2 mm on the outer periphery of an annealed copper stranded wire conductor (cross-sectional area: 0.5 mm ² ) obtained by twisting seven anodized copper wires, and the conductor was made of an insulating material made of a resin composition. An insulated electric wire coated with was obtained.

(Comparative Examples 1-12)
The insulated wire which concerns on the comparative example was obtained like the Example except having set it as the component composition (mass part) of Table 3.

  Using the insulated wires obtained in Examples and Comparative Examples, an abrasion resistance test was performed as an example of physical property evaluation. The test results are shown in Tables 2 and 3. The abrasion resistance test method is as follows.

[Abrasion resistance test method]
In accordance with JASO D611-94, the test was performed by a blade reciprocation method. Specifically, an insulated wire is cut into a length of 750 mm to form a test piece, and the test piece is fixed on a table, and then the surface of the coating material of the test piece is 10 mm in the axial direction at room temperature of 25 ° C. The blade was reciprocated with a load of 7 N at a speed of 50 times per minute, and the number of reciprocations until contact with the conductor was measured. This operation was repeated 100 mm in the axial direction and 90 ° in the clockwise direction, and further 100 mm in the axial direction and 90 ° in the clockwise direction, and the number of reciprocations was measured a total of 3 times for the same test piece. . As a result, the case where the average number of reciprocations of three times (the number of wears) exceeded 500 was regarded as acceptable.

(Resin component)
-Polypropylene (PP): “Prime Polypro E-150GK” manufactured by Prime Polymer Co., Ltd.
・ Polyethylene (PE): “HIZEX 5000S” manufactured by Prime Polymer Co., Ltd.
-Ethylene-vinyl acetate copolymer (EVA): "Evaflex EV360" manufactured by Mitsui DuPont Polychemical Co., Ltd.
Polyolefin thermoplastic elastomer (TPO): “T310E” manufactured by Prime Polymer Co., Ltd.
Polybutylene terephthalate (PBT): “Toraycon 1401X06” manufactured by Toray Industries, Inc.
Polyethylene terephthalate (PET): “TR8550T” manufactured by Teijin Chemicals

(Resin compatibilizer)
Maleic acid-modified polypropylene (MA-PP): Compound A
-Maleic acid-modified polyethylene (MA-PE): Compound B
Acrylic acid-modified polypropylene (AA-PP): manufactured by Chemtura, “Polybond 1002”
-Maleic anhydride modified polypropylene (MAH-PP): "Yumex 1010" manufactured by Sanyo Chemical Industries
・ Ethylene-glycidyl methacrylate copolymer (GMA-PE): manufactured by Aldrich, epoxy group-containing ethylene copolymer (epoxy additive)

(Additive)
-Metal hydrate: “Magnifine H10” manufactured by Martinsberg
Melamine cyanurate: DSM Japan, “melapurMC15”
Condensed phosphate ester: “ADEKA STAB FP-700” manufactured by ADEKA
・ Clay: Shiraishi Calcium, Opti White
・ Calcium carbonate: Shiraishi Calcium Co., Ltd.
Antioxidant: “Irganox 1010” manufactured by Ciba Specialty Chemicals
Metal deactivator: “Irganox MD1024” manufactured by Ciba Specialty Chemicals

  From Examples 1 to 10 in Table 2 and Comparative Examples 1 to 10 in Table 3, the abrasion resistance of various polyolefin-polyester resin compositions is significantly improved by using the resin compatibilizer according to the present invention. Was confirmed. Further, from Comparative Examples 11 and 12 in Table 3, when the maleic anhydride-modified polypropylene or the epoxy group-containing ethylene copolymer is used, the effect of improving the abrasion resistance of the polyolefin-polyester resin composition is small. It could be confirmed.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

  For example, in the above examples, as an example, an insulated wire was prepared using the resin composition according to the present invention, and physical properties of the insulated wire were evaluated for wear resistance. As for other physical properties such as moldability, chemical resistance, heat resistance, and mechanical strength, it is easily guessed that the same effect can be obtained.

Claims (6)

A resin composition comprising the following (A) and (B):
(A) Resin component containing polyolefin and polyester (B) 1 selected from a polymer chain composed of a polymer compatible with the polyolefin, and a carboxylic acid group and a carboxylate group introduced into the polymer chain Resin compatibilizer having seeds or two or more functional groups   Content of the functional group of the said (B) component exists in the range of 0.1-20 mass%, The resin composition of Claim 1 characterized by the above-mentioned.   The resin composition according to claim 1 or 2, wherein the component (B) is in the range of 0.1 to 40 parts by mass with respect to 100 parts by mass of the component (A).   The resin composition according to claim 1, wherein the polymer chain of the component (B) is made of polyolefin.   The resin composition according to any one of claims 1 to 4, wherein the polyester of the component (A) is a polycondensate of a polyvalent carboxylic acid and a polyhydric alcohol.   Having a polymer chain composed of a polymer compatible with polyolefin, and one or more functional groups selected from a carboxylic acid group and a carboxylate group introduced into the polymer chain. A characteristic resin compatibilizer.