Resin composition and molded product

Abstract

To provide a resin composition that yields a molded product with high mechanical characteristics and excellent appearance.SOLUTION: A resin composition comprises a polyester resin and / or polyamide resin (A), a polyolefin resin (B), and a modified polymer modified with carboxylic acid and / or a carboxylic acid derivative (C).SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a resin composition and a molded article. [Background technology]

[0002] Polyester resins are widely used as materials for containers of seasonings, beverages, cosmetics, etc., and for food packaging films, because of their excellent mechanical properties, heat resistance, rigidity, gas barrier properties, flavor barrier properties, etc. On the other hand, although polyester resins have high rigidity, their high glass transition temperature of about 81°C makes them unsuitable for the production of molded products that require impact resistance.

[0003] Polyamide resins have excellent chemical resistance and oxygen barrier properties and are therefore widely used in fields such as food packaging materials and food containers, automobile parts, etc. However, polyamide resins have low melt tension at molding temperatures, making them difficult to mold into films, sheets, blown products, and the like.

[0004] For these reasons, polymer blends (including polymer alloys) of polyester resins and / or polyamide resins with polyolefin resins have been actively studied. For example, Patent Document 1 describes that by blending polyester resin, olefin resin, and carboxylic acid-modified ethylene-α-olefin copolymer in a specific ratio, it is possible to produce molded articles having high low-temperature impact strength and high rigidity.

[0005] Furthermore, Patent Document 2 describes that by using a resin composition in which a polyamide resin, a polyolefin resin, and two or more types of compatibilizers including a maleic acid-modified polyolefin resin are melt-mixed, excellent impact resistance and excellent rigidity can be obtained. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2001-106886 A [Patent Document 2] JP 2013-129800 A Summary of the Invention [Problem to be solved by the invention]

[0007] Polymer blends of polyester resin and / or polyamide resin with polyolefin resin are expected to be used in various applications, and therefore are required to have properties suited to each application. However, according to the studies of the present inventors, it has been found that when the compatibilizers described in Patent Document 1 or Patent Document 2 are used, the toughness and appearance of the resulting molded article are insufficient, and further improvement is required.

[0008] An object of one aspect of the present invention is to provide a resin composition which can give a molded article having high mechanical properties and excellent appearance. [Means for solving the problem]

[0009] As a result of intensive research, the present inventors have found that the above-mentioned problems can be solved by using a modified polymer having a specific structure in a polymer blend of a polyester resin and / or a polyamide resin and a polyolefin resin, and have thus achieved the present invention.

[0010] [1] A resin composition comprising a polyester resin and / or a polyamide resin (A), a polyolefin resin (B), and a modified polymer (C) modified with a carboxylic acid and / or a carboxylic acid derivative. [2] The resin composition according to [1], wherein the polyester resin and / or polyamide resin (A) contains at least one polyester resin selected from polyethylene terephthalate, polybutylene terephthalate, and polylactic acid. [3] The resin composition according to [1] or [2], wherein the polyolefin resin (B) is polypropylene. [4] The resin composition according to [1] or [2], wherein the polyolefin resin (B) is polyethylene. [5] The resin composition according to any one of [1] to [4], wherein the acid value of the modified polymer (C) is 70 mg KOH / g or less. [6] The resin composition according to any one of [1] to [5], wherein the modified polymer (C) has a mass average molecular weight of 50,000 or more. [7] The resin composition according to any one of [1] to [6], wherein the modified polymer (C) has a melt mass flow rate of 0.1 g / 10 min or more at 180° C. and 2.16 kgf (21.18 N). [8] The resin composition according to any one of [1] to [7], wherein the modified polymer (C) is a copolymer of the carboxylic acid and / or carboxylic acid derivative with a polyolefin or an elastomer. [9] The resin composition according to [8], wherein the structural unit derived from the carboxylic acid and / or the carboxylic acid derivative is in a graft chain of the modified polymer (C).

[10] The resin composition according to [8], wherein the carboxylic acid and / or carboxylic acid derivative is a dicarboxylic acid anhydride.

[11] The resin composition according to [8], wherein the polyolefin is polyethylene or polypropylene.

[12] The resin composition according to any one of [1] to

[11] , wherein the content of the modified polymer (C) in a total of 100 parts by mass of the polyester resin and / or polyamide resin (A), the polyolefin resin (B), and the modified polymer (C) is 0.1 parts by mass or more and less than 20 parts by mass.

[13] The resin composition according to any one of [1] to

[12] , wherein the content of the polyester resin and / or polyamide resin (A) is 1 part by mass or more and 99 parts by mass or less, and the content of the polyolefin resin (B) is 1 part by mass or more and 99 parts by mass or less, in a total of 100 parts by mass of the polyester resin and / or polyamide resin (A), the polyolefin resin (B), and the modified polymer (C).

[14] A molded article comprising the resin composition according to any one of [1] to

[13] . Effect of the Invention

[0011] According to one aspect of the present invention, there is provided a resin composition capable of giving a molded article having high mechanical properties and excellent appearance. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, one embodiment of the present invention will be described in detail, but the present invention is not limited to each of the following embodiments within the scope of the purpose. In this specification, "to" includes the lower limit and the upper limit. In addition, for each preferred range, the upper limit and the lower limit can be used in any combination.

[0013] <1.Resin composition> A resin composition according to one embodiment of the present invention contains a polyester resin and / or a polyamide resin (hereinafter, sometimes referred to as a polyester resin and / or a polyamide resin (A)), a polyolefin resin (hereinafter, sometimes referred to as a polyolefin resin (B)), and a modified polymer (C) modified with a carboxylic acid and / or a carboxylic acid derivative.

[0014] In a resin composition of a polymer blend of a polyester resin and / or a polyamide resin (A) and a polyolefin resin (B), a compatibilizer may be used to improve the compatibility between the resins. As such a compatibilizer, JP 2001-106886 A proposes the use of a carboxylic acid-modified ethylene-α-olefin copolymer. In addition, JP 2013-129800 A proposes two or more compatibilizers including a maleic acid-modified polyolefin resin.

[0015] However, the polymer blend containing such a compatibilizer has room for improvement in mechanical properties such as tensile modulus, tensile elongation at break, and Charpy impact strength, etc. Also, the molded product of the polymer blend may have so-called lumps due to poor dispersion of the polyester resin, and the appearance may need to be improved.

[0016] In one aspect of the present invention, a molded article having high mechanical properties and excellent appearance can be provided by using a modified polymer (C) having a specific structure in the polymer blend. Although the mechanism is not clear, it is believed that the modified polymer (C) has a carboxylic acid and / or a carboxylic acid derivative, and thus the modified polymer (C) reacts appropriately with the polyester resin and / or polyamide resin (A) and can impart a molecular structure that is easily compatible with the polyolefin resin (B). As a result, the resin composition according to one aspect of the present invention exhibits physical properties that combine the fluidity and rigidity of the polyester resin and / or polyamide resin (A) and the toughness of the polyolefin resin (B) by promoting dispersion during mixing, and a molded article having excellent appearance can be obtained.

[0017] Thus, according to one aspect of the present invention, when waste of molded articles containing a polyester resin and / or a polyamide resin (A) and a polyolefin resin (B) is recycled, a new resin composition and a molded article thereof can be produced with high efficiency while minimizing the deterioration of physical properties. Such an effect also contributes to the achievement of, for example, Goal 12 "Responsible Consumption and Production" of the Sustainable Development Goals (SDGs) advocated by the United Nations.

[0018] <1-1. Polyester resin and / or polyamide resin (A)> The resin composition according to one embodiment of the present invention contains a polyester resin and / or a polyamide resin (A). Here, the polyester resin and / or the polyamide resin (A) may be a resin containing both a polyester resin and a polyamide resin, or a resin containing only one of a polyester resin and a polyamide resin.

[0019] (1-1-1. Polyester resin) The polyester resin is a polycondensation product of an aromatic or aliphatic dicarboxylic acid and a diol. In producing the polyester resin, one kind of dicarboxylic acid and one kind of diol may be selected and produced under normal polycondensation conditions, or two or more kinds may be appropriately combined and produced.

[0020] Examples of dicarboxylic acids include terephthalic acid, isophthalic acid, adipic acid, sebacic acid, naphthalene-1,4-dicarboxylic acid, naphthalene-2,6-dicarboxylic acid, and diphenyl ether-4,4'-dicarboxylic acid.

[0021] Examples of diols include ethylene glycol, propylene glycol, 1,4-butylene glycol, neopentyl glycol, cyclohexanedimethanol, and 2,2-bis(4-hydroxyphenyl)propane, etc. In polycondensation, a hydroxycarboxylic acid such as p-hydroxybenzoic acid may be coexisted.

[0022] Representative examples of polyester resins produced from the dicarboxylic acid and diol include polyethylene terephthalate and polybutylene terephthalate. The polyester resin may be at least one of a biomass-derived and biodegradable resin, such as polylactic acid containing lactic acid as a constituent unit.

[0023] The polyester resin may be a recycled product obtained by using the molded product once, or may be a mixture of unused and recycled products. The polyester resin is preferably a polyester resin having an intrinsic viscosity (IV) of 0.30 to 0.85 (dl / g) measured at 25°C in a phenol / tetrachloroethylene=50 / 50 (weight ratio) mixed solvent.

[0024] The intrinsic viscosity of the polyester resin is preferably more than 0.30 (dl / g) and less than 0.85 (dl / g). If the intrinsic viscosity of the polyester resin used is 0.30 (dl / g) or less, the moldability may deteriorate due to low melt tension, and the mechanical properties of the molded body such as a film may become unsatisfactory, which is not preferable. If the intrinsic viscosity of the polyester resin used is 0.85 (dl / g) or more, the moldability may deteriorate due to high melt viscosity.

[0025] (1-1-2. Polyamide resin) A polyamide resin is a polymer having an amide bond (-NHCO-) ​​in the main chain. Examples of polyamide resins include polyamide resins obtained by condensation polymerization of diamines and dicarboxylic acids, polyamide resins obtained by ring-opening polymerization of lactams, polyamide resins obtained by self-condensation of aminocarboxylic acids, and copolymers obtained by copolymerization of two or more monomers constituting these polyamide resins. These polyamide resins may be used alone or in combination of two or more. When used in combination, a method of using a blend of these polyamide resins or a method of using a polyamide resin obtained by copolymerizing the raw materials of these polyamide resins may be mentioned.

[0026] Examples of the diamine include aliphatic diamines, alicyclic diamines, and aromatic diamines.

[0027] Examples of the aliphatic diamine include linear saturated aliphatic diamines having 2 to 20 carbon atoms and branched saturated aliphatic diamines having 3 to 20 carbon atoms. Examples of linear saturated aliphatic diamines having 2 to 20 carbon atoms include ethylenediamine, propylenediamine, tetramethylenediamine, pentamethylenediamine, hexamethylenediamine, heptamethylenediamine, octamethylenediamine, nonamethylenediamine, decamethylenediamine, undecamethylenediamine, dodecamethylenediamine, and tridecamethylenediamine. Examples of branched saturated aliphatic diamines having 3 to 20 carbon atoms include 2-methylpentamethylenediamine (also written as 2-methyl-1,5-diaminopentane), 2,2,4-trimethylhexamethylenediamine, 2,4,4-trimethylhexamethylenediamine, 2-methyloctamethylenediamine, and 2,4-dimethyloctamethylenediamine. Furthermore, examples of branched saturated aliphatic diamines having 3 to 20 carbon atoms include diamines having a substituent branched from the main chain.

[0028] Examples of alicyclic diamines (also referred to as alicyclic diamines) include 1,4-cyclohexanediamine, 1,3-cyclohexanediamine, and 1,3-cyclopentanediamine.

[0029] Examples of aromatic diamines include metaxylylenediamine, paraxylylenediamine, metaphenylenediamine, orthophenylenediamine, and paraphenylenediamine.

[0030] Examples of the dicarboxylic acid include an aliphatic dicarboxylic acid, an alicyclic dicarboxylic acid, and an aromatic dicarboxylic acid.

[0031] Examples of the aliphatic dicarboxylic acid include linear or branched saturated aliphatic dicarboxylic acids having 3 to 20 carbon atoms, such as malonic acid, dimethylmalonic acid, succinic acid, 2,2-dimethylsuccinic acid, 2,3-dimethylglutaric acid, 2,2-diethylsuccinic acid, 2,3-diethylglutaric acid, glutaric acid, 2,2-dimethylglutaric acid, adipic acid, 2-methyladipic acid, trimethyladipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, dodecanedioic acid, tetradecanedioic acid, hexadecanedioic acid, octadecanedioic acid, eicosane dioic acid, and diglycolic acid.

[0032] Examples of the alicyclic dicarboxylic acid include 1,4-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, and 1,3-cyclopentanedicarboxylic acid.

[0033] The number of carbon atoms in the alicyclic structure of the alicyclic carboxylic acid is not particularly limited, but is preferably 3 to 10, and more preferably 5 to 10, from the viewpoint of the balance between water absorption and crystallinity of the resulting polyamide resin.

[0034] The alicyclic dicarboxylic acid may be unsubstituted or may have a substituent. Examples of the substituent in the alicyclic dicarboxylic acid include an alkyl group having 1 to 4 carbon atoms, such as a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, and a tert-butyl group.

[0035] Examples of aromatic dicarboxylic acids include unsubstituted or substituted aromatic dicarboxylic acids having 8 to 20 carbon atoms. Examples of the substituent in the aromatic dicarboxylic acid include an alkyl group having 1 to 6 carbon atoms, an aryl group having 6 to 12 carbon atoms, an arylalkyl group having 7 to 20 carbon atoms, a halogen group such as a chloro group or a bromo group, an alkylsilyl group having 3 to 10 carbon atoms, a sulfonic acid group, and salts thereof such as sodium salts.

[0036] Examples of aromatic dicarboxylic acids include terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, 2-chloroterephthalic acid, 2-methylterephthalic acid, 5-methylisophthalic acid, and 5-sodium sulfoisophthalic acid.

[0037] The dicarboxylic acid may further contain a polyvalent carboxylic acid having a valence of three or more, such as trimellitic acid, trimesic acid, or pyromellitic acid, within a range that does not impair the object of one embodiment of the present invention.

[0038] The above-mentioned diamines and dicarboxylic acids may each be used alone or in combination of two or more kinds.

[0039] Examples of lactams include butyrolactam, pivalolactam, ε-caprolactam, caprylolactam, enantholactam, undecanolactam, laurolactam (dodecanolactam), etc. Among these, from the viewpoint of toughness, ε-caprolactam or laurolactam is preferred, and ε-caprolactam is more preferred.

[0040] Examples of the aminocarboxylic acid include compounds in which the lactam is ring-opened (ω-aminocarboxylic acid, α,ω-aminocarboxylic acid, etc.). From the viewpoint of increasing the crystallinity of the polyamide resin, the aminocarboxylic acid is preferably a linear or branched saturated aliphatic carboxylic acid having 4 to 14 carbon atoms and substituted with an amino group at the ω position. Examples of such carboxylic acids include 6-aminocaproic acid, 11-aminoundecanoic acid, and 12-aminododecanoic acid. Other examples of the aminocarboxylic acid include paraaminomethylbenzoic acid.

[0041] Examples of the polyamide resins include polyamide 4 (poly-α-pyrrolidone), polyamide 6 (polycaproamide), polyamide 11 (polyundecane amide), polyamide 12 (polydodecanamide), polyamide 46 (polytetramethylene adipamide), polyamide 56 (polypentamethylene adipamide), polyamide 66 (polyhexamethylene adipamide), polyamide 610 (polyhexamethylene sebacamide), polyamide 612 (polyhexamethylene dodecamide), polyamide 613 (polyhexamethylene sebacamide), polyamide 614 (polyhexamethylene dodecamide), polyamide 615 (polyhexamethylene sebacamide), polyamide 616 (polyhexamethylene dodecamide), polyamide 617 (polyhexamethylene sebacamide), polyamide 618 (polyhexamethylene dodecamide), polyamide 619 (polyhexamethylene sebacamide), polyamide 620 (polyhexamethylene sebacamide), polyamide 621 (polyhexamethylene dodecamide), polyamide 622 (polyhexamethylene dodecamide), polyamide 623 (polyhexamethylene dodecamide), polyamide 624 (polyhexamethylene dodecamide), polyamide 625 (polyhexamethylene dodecamide), polyamide 626 (polyhexamethylene dodecamide), polyamide 627 (polyhexamethylene dodecamide), polyamide 628 (polyhexamethylene dodecamide), polyamide 629 (polyhexamethylene dodecamide), polyamide 630 (polyhexamethylene dodecamide), polyamide 631 (polyhexamethylene dodecamide), polyamide 632 (polyhexamethylene dodecamide), polyamide 633 (polyhexamethylene dodecamide), polyamide 634 (polyhexamethylene dodecamide), polyamide 635 (polyhexamethylene dodecamide), polyamide 636 (polyhexamethylene dodecamide), polyamide 637 (polyhex Polyamide 116 (polyundecamethylene adipamide), polyamide TMHT (trimethylhexamethylene terephthalamide), polyamide 6T (polyhexamethylene terephthalamide), polyamide 2Me-5T (poly 2-methylpentamethylene terephthalamide), polyamide 9T (polynonamethylene terephthalamide), 2Me-8T (poly 2-methyloctamethylene terephthalamide), polyamide 6I (polyhexamethylene isophthalamide), polyamide 6C (polyhexamethylene cyclohexamethylene) Polyamide 2Me-5C (Poly 2-methylpentamethylenecyclohexanedicarboxamide), Polyamide 9C (Polynonamethylenecyclohexanedicarboxamide), 2Me-8C (Poly 2-methyloctamethylenecyclohexanedicarboxamide), Polyamide PBCM12 (Polybis(4-aminocyclohexyl)methanedecamide), Polyamide dimethyl PBCM12 (Polybis(3-methyl-aminocyclohexyl)methanedecamide), Polyamide Examples of the polyamides include polyamide MXD6 (polymetaxylylene adipamide), polyamide 10T (polydecamethylene terephthalamide), polyamide 11T (polyundecamethylene terephthalamide), polyamide 12T (polydodecamethylene terephthalamide), polyamide 10C (polydecamethylene cyclohexane dicarboxamide), polyamide 11C (polyundecamethylene cyclohexane dicarboxamide), and polyamide 12C (polydodecamethylene cyclohexane dicarboxamide). Note that the "Me" represents a methyl group.

[0042] In addition, when the above-mentioned various monomers are polymerized to produce a polyamide resin, a terminal blocking agent can be further added to adjust the molecular weight. The terminal blocking agent is not particularly limited, and any known terminal blocking agent can be used.

[0043] Examples of the end-capping agent include monocarboxylic acids, monoamines, acid anhydrides, monoisocyanates, monoacid halides, monoesters, monoalcohols, etc. These may be used alone or in combination of two or more.

[0044] The monocarboxylic acid usable as the terminal blocking agent may be any one that is reactive with an amino group, and examples thereof include aliphatic monocarboxylic acids, alicyclic monocarboxylic acids, and aromatic monocarboxylic acids. Examples of aliphatic monocarboxylic acids include formic acid, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, caprylic acid, lauric acid, tridecylic acid, myristic acid, palmitic acid, stearic acid, pivalic acid, and isobutyric acid. Examples of alicyclic monocarboxylic acids include cyclohexane carboxylic acid. Examples of aromatic monocarboxylic acids include benzoic acid, toluic acid, α-naphthalene carboxylic acid, β-naphthalene carboxylic acid, methylnaphthalene carboxylic acid, and phenyl acetic acid. These may be used alone or in combination of two or more.

[0045] The monoamines usable as the terminal blocking agent may be any monoamines that are reactive with carboxyl groups, and may include, for example, aliphatic monoamines, alicyclic monoamines, and aromatic monoamines. Examples of aliphatic monoamines include methylamine, ethylamine, propylamine, butylamine, hexylamine, octylamine, decylamine, stearylamine, dimethylamine, diethylamine, dipropylamine, and dibutylamine. Examples of alicyclic monoamines include cyclohexylamine and dicyclohexylamine. Examples of aromatic monoamines include aniline, toluidine, diphenylamine, and naphthylamine. These may be used alone or in combination of two or more.

[0046] Examples of acid anhydrides that can be used as end-capping agents include phthalic anhydride, maleic anhydride, benzoic anhydride, acetic anhydride, hexahydrophthalic anhydride, etc. These may be used alone or in combination of two or more.

[0047] Examples of monoisocyanates that can be used as end-capping agents include phenyl isocyanate, tolyl isocyanate, dimethylphenyl isocyanate, cyclohexyl isocyanate, butyl isocyanate, naphthyl isocyanate, etc. These may be used alone or in combination of two or more.

[0048] Examples of monoacid halides that can be used as end-capping agents include halogen-substituted monocarboxylic acids obtained by halogen-substitution of monocarboxylic acids such as benzoic acid, diphenylmethanecarboxylic acid, diphenylsulfonecarboxylic acid, diphenylsulfoxidecarboxylic acid, diphenylsulfidecarboxylic acid, diphenylethercarboxylic acid, benzophenonecarboxylic acid, biphenylcarboxylic acid, α-naphthalenecarboxylic acid, β-naphthalenecarboxylic acid, and anthracenecarboxylic acid. These may be used alone or in combination of two or more.

[0049] Examples of monoesters that can be used as end-capping agents include glycerin monopalmitate, glycerin monostearate, glycerin monobehenate, glycerin monomontanate, pentaerythritol monopalmitate, pentaerythritol monostearate, pentaerythritol monobehenate, pentaerythritol monomontanate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monobehenate, sorbitan monomontanate, sorbitan dimontanate, sorbitan trimontanate, sorbitol monopalmitate, sorbitol monostearate, sorbitol monobehenate, sorbitol tribehenate, sorbitol monomontanate, and sorbitol dimontanate. These may be used alone or in combination of two or more.

[0050] Examples of monoalcohols that can be used as end-capping agents include propanol, butanol, pentanol, hexanol, heptanol, octanol, nonanol, decanol, undecanol, dodecanol, tridecanol, tetradecanol, pentadecanol, hexadecanol, heptadecanol, octadecanol, nonadecanol, eicosanol, docosanol, tricosanol, tetracosanol, hexacosanol, heptacosanol, octacosanol, triacontanol (all linear or branched), oleyl alcohol, behenyl alcohol, phenol, cresol (o-, m- or p-isomer), biphenol (o-, m- or p-isomer), 1-naphthol, and 2-naphthol. These may be used alone or in combination of two or more.

[0051] Among the above, preferred polyamide resins are polyamide 4 (poly-α-pyrrolidone), polyamide 6 (polycaproamide), polyamide 11 (polyundecane amide), polyamide 12 (polydodecanamide), polyamide 46 (polytetramethylene adipamide), polyamide 56 (polypentamethylene adipamide), polyamide 66 (polyhexamethylene adipamide), polyamide 610 (polyhexamethylene sebacamide), polyamide 612 (polyhexamethylene dodecamide), polyamide 116 (polyundecamethylene adipamide), and the like.

[0052] The mass average molecular weight of the polyamide resin is not particularly limited, but from the viewpoint of mechanical properties, it is preferably 10,000 or more, more preferably 15,000 or more, and more preferably 20,000 or more. On the other hand, from the viewpoint of processability, the mass average molecular weight is preferably 70,000 or less, more preferably 65,000 or less, and more preferably 60,000 or less. The mass average molecular weight of the polyamide resin can be measured by gel permeation chromatography.

[0053] Commercially available polyamide resins include, for example, UBE Nylon 1013B, UBE 1022B, and UBE 1030B manufactured by Ube Industries, Ltd., Glamide T-802, Glamide T-860, Glamide T-222SA, Glamide T-662, and Glamide T-656E manufactured by Toyobo Co., Ltd., and Unitika Nylon A1020BRL, Unitika Nylon A1030BRL, and Unitika Nylon A1040BRL manufactured by Unitika Ltd. Examples of such nylon include Unitika Nylon A1030BRF, Unitika Nylon A1030BRT, Unitika Nylon M1040, and Unitika Nylon A125, as well as Amilan CM1007, Amilan CM1017, Amilan CM1017XL3, Amilan CM1017K, Amilan CM1026, Amilan CM3007, Amilan CM3001-N, Amilan CM3006, and Amilan CM3301L manufactured by Toray Industries, Inc.

[0054] <1-2. Polyolefin resin (B)> As described above, the resin composition according to one embodiment of the present invention contains a polyolefin resin (B). In addition, in one embodiment of the present invention, the "polyolefin resin (B)" is a resin in which the proportion of olefin units or cycloolefin units is 80 mol% or more relative to 100 mol% of all structural units constituting the resin, and is different from the modified polymer (C). In particular, the total proportion of olefin units and cycloolefin units relative to 100 mol% of all structural units constituting the polyolefin resin (B) is preferably 85 mol% or more, more preferably 90 mol% or more.

[0055] Examples of the polyolefin resin (B) include α-olefin homopolymers, α-olefin copolymers, and cycloolefin polymers. Examples of the α-olefin homopolymers include polyethylene, polypropylene, polybutene, poly(3-methyl-1-butene), poly(3-methyl-1-pentene), and poly(4-methyl-1-pentene). Examples of the α-olefin copolymers include ethylene-propylene block or random copolymers, α-olefin-propylene block or random copolymers having 4 or more carbon atoms, ethylene-methyl methacrylate copolymers, and ethylene-vinyl acetate copolymers. Examples of the cycloolefin polymers include polycyclohexene and polycyclopentene.

[0056] Examples of polyethylene include low-density polyethylene, linear low-density polyethylene, and high-density polyethylene. Examples of polypropylene include isotactic polypropylene, syndiotactic polypropylene, hemiisotactic polypropylene, and stereoblock polypropylene. In the α-olefin-propylene block or random copolymer having 4 or more carbon atoms, examples of the α-olefin having 4 or more carbon atoms include butene, 3-methyl-1-butene, 3-methyl-1-pentene, and 4-methyl-1-pentene. In the resin composition according to one embodiment of the present invention, only one type of polyolefin resin (B) may be contained, or two or more types may be contained. These may be unused polymers or recycled polymers after once being used.

[0057] Among the above, the polyolefin resin (B) is preferably polyethylene, polypropylene or polybutene, and more preferably a propylene-based polymer such as polypropylene or block polypropylene.

[0058] The melt mass flow rate of the polyolefin resin (B) is not particularly limited, but in order to improve mechanical properties, it is preferably 0.1 g / 10 min or more, more preferably 0.2 g / 10 min or more, and more preferably 0.3 g / 10 min or more. On the other hand, in order to improve processability, the melt mass flow rate is preferably 70 g / 10 min or less, more preferably 60 g / 10 min or less, more preferably 50 g / 10 min or less, more preferably 30 g / 10 min or less, more preferably 25 g / 10 min or less, more preferably 15 g / 10 min or less, more preferably 12.5 g / 10 min or less, and more preferably 10 g / 10 min or less. The melt mass flow rate of the polyolefin resin (B) can be calculated according to JIS K7210. The temperature and load in measuring the melt mass-flow rate shall follow the material standards for materials specified by those standards, and shall be 190°C and 2.16 kgf (21.18 N) for materials not specified.

[0059] Commercially available products of the polyolefin resin (B) include, for example, Novatec (registered trademark) MA3, Novatec MA3H, Novatec MA1B, Novatec EA9, Novatec EA9HD, Novatec EA9FTD, Novatec EA7AD, Novatec FY6H, Novatec EA6A, Novatec FY6, Novatec FY6C, Novatec FY4, and Novatec SA3A manufactured by Japan Polypropylene Corporation, and Prime Polypro (registered trademark) J105G, Prime Polypro J106G, Prime Polypro J106MG, and Prime Polypro 107G manufactured by Prime Polymer Co., Ltd. , Prime Polypro J137G, Prime Polypro J108M, Evolue (registered trademark) SP2320, Evolue SP2520, Evolue SP2510, Evolue SP3010, Evolue SP4020, Evolue SP1071C, Hi-Zex (registered trademark) 1300J, Hi-Zex 2100J, Hi-Zex 2100JH, Hi-Zex 2200J, Hi-Zex 2208J, Hi-Zex 3300F, Hi-Zex 3600F, Hi-Zex 7000F and Hi-Zex 8000F, and Novatec LL manufactured by Japan Polyethylene Co., Ltd. UF420, Novatec LL UF421, Novatec LL UF621, Novatec LL UF524, Novatec LL UF622, Novatec LL UF230, Novatec LL UF320, Novatec LL UF332, Novatec LL UA421, Novatec LL UF240, Novatec LL UF442, Novatec LL UF641, Novatec LL UF943, Novatec LL UJ960, Novatec LL UJ370, Novatec LL UJ580, Novatec LL UJ480, Novatec LL UJ990, Novatec LL UJ790, Novatec LL UE320, Novatec LL UR951, Novatec C6 SF720, Novatec C6 SF941, Novatec C6 SF8402, Novatec HD HJ360, Novatec HD 362N, Novatec HD HJ560, Novatec HD HJ580N, Novatec HD HJ490, Novatec HD HJ590N, Novatec HD HY420, Novatec HD HY530, Novatec HD HY430, Novatec HD HY331, Novatec HD HY540, Novatec HDNovatec HD HE122R, Novatec HD HF313, Novatec HD HF111K, Novatec HD HF560, Novatec HD HE121, Novatec HD HE212W, Novatec HD HE421, Novatec HD HB420R, Novatec HD HB338RE, Novatec HD HB332E, Novatec HD HB432E, Novatec HD HB530, Novatec HD HB216R and Novatec HDHB111R.

[0060] <1-3. Modified polymer (C)> The resin composition according to one aspect of the present invention contains a modified polymer (C) modified with a carboxylic acid and / or a carboxylic acid derivative. The modified polymer (C) may contain other components such as dienes. "Modified with a carboxylic acid and / or a carboxylic acid derivative" refers to a state in which a polymer serving as a substrate for modification is copolymerized with a carboxylic acid and / or a carboxylic acid derivative. From the viewpoint of improving mechanical properties and appearance, it is preferable that a structural unit derived from a carboxylic acid and / or a carboxylic acid derivative is present in the graft chain of the modified polymer (C).

[0061] Examples of carboxylic acids include (meth)acrylic acid, maleic acid, methylmaleic acid, fumaric acid, methylfumaric acid, tetrahydrophthalic acid, itaconic acid, citraconic acid, crotonic acid, isocrotonic acid, glutaconic acid, and norbornane-5-ene-2,3-dicarboxylic acid. Note that "(meth)acrylic acid" refers to acrylic acid or methacrylic acid.

[0062] Examples of the carboxylic acid derivative include carboxylic acid esters, carboxylic acid anhydrides, and carboxylic acid imides.

[0063] Examples of the carboxylic acid ester include ester compounds of the above-mentioned carboxylic acids, such as (meth)acrylic acid esters such as methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and glycidyl (meth)acrylate.

[0064] Examples of the carboxylic acid anhydride include anhydrides of the above-mentioned carboxylic acids, such as dicarboxylic acid anhydrides such as maleic anhydride, itaconic anhydride, succinic anhydride, citraconic anhydride, and 5-norbornene-2,3-dicarboxylic anhydride.

[0065] Examples of the carboxylic acid imide include imide compounds of the above-mentioned carboxylic acids, such as maleimide compounds such as maleimide, N-ethylmaleimide, and N-phenylmaleimide.

[0066] As the carboxylic acid and / or carboxylic acid derivative, one kind may be used alone, or two or more kinds may be used in combination. Among the above, from the viewpoint of modification reactivity, carboxylic acid ester or dicarboxylic acid anhydride is preferable, dicarboxylic acid anhydride is more preferable, and maleic anhydride is more preferable.

[0067] The method for producing the modified polymer (C) is not particularly limited, and examples thereof include (1) a method of polymerizing a polymer to be a substrate for modification, and then adding a compound or monomer having a carboxylic acid and / or a carboxylic acid derivative; (2) a method of polymerizing a polymer to be a substrate for modification, and then oxidizing the polymer to generate a carboxylic acid group in the copolymer molecule; and (3) a method of copolymerizing a polymer to be a substrate for modification with a compound or monomer having an acidic group. As the polymerization method, radical polymerization methods such as solution polymerization, emulsion polymerization, suspension polymerization, and bulk polymerization, or living polymerization methods can be adopted. Furthermore, a method of polymerizing after forming a macromonomer once can also be adopted. The modified polymer (C) preferably has a carboxylic acid and / or a carboxylic acid derivative as a graft chain, and in this respect, the method (1) is preferred. The modified polymer (C) may have a carboxylic acid and / or a carboxylic acid derivative in the main chain.

[0068] The total proportion of the carboxylic acid and / or carboxylic acid derivative in 100% by weight of the modified polymer (C) is not particularly limited, but is preferably 0.01% by weight or more, more preferably 0.05% by weight or more, in order to improve the compatibility between the polyester resin and / or polyamide resin (A) and the polyolefin resin (B), while the total proportion is preferably 20% by weight or less, more preferably 15% by weight or less, in order to improve the appearance of the molded product.

[0069] In the modified polymer (C), examples of the polymer that serves as the substrate for modification include polyolefins and elastomers. In other words, the modified polymer (C) may be a copolymer of a carboxylic acid and / or a carboxylic acid derivative with a polyolefin, or a copolymer of a carboxylic acid and / or a carboxylic acid derivative with an elastomer.

[0070] In the modified polymer (C), the polyolefin to be the substrate of modification is not particularly limited, and examples thereof include polyethylene, polypropylene, and thermoplastic elastomers. The modified polymer (C) may contain one or more of the polyolefins exemplified in the above <1-2. Polyolefin resin (B)>.

[0071] The modified polymer (C) is dissolved in an organic solvent, and the solution is subjected to pyrolysis GC-MS (gas chromatography mass spectrometer, using a non-polar column), whereby the molecular weight of the modified polymer (C) can be obtained, and the number of carbon atoms and the content of the α-olefin contained in the modified polymer (C) can be calculated. An example of the organic solvent that dissolves the modified polymer (C) is THF (tetrahydrofuran), but is not limited thereto.

[0072] In the modified polymer (C), the elastomer serving as the substrate for modification is not particularly limited, but is preferably, for example, a thermoplastic elastomer. Examples of the thermoplastic elastomer include an olefin-based thermoplastic elastomer and a styrene-based thermoplastic elastomer.

[0073] Examples of olefin-based thermoplastic elastomers include α-olefin-ethylene copolymers. The ethylene content in the α-olefin-ethylene copolymer is preferably 60 to 95 mol%, more preferably 70 to 90 mol%, and the α-olefin content is preferably 5 to 40 mol%, more preferably 10 to 30 mol%. The olefin-based thermoplastic elastomer may be a random copolymer of α-olefin and ethylene. The α-olefin is preferably a linear or branched α-olefin having 3 to 20 carbon atoms, such as propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-octene, and 1-decene, and two or more of these may be used in combination. Among these copolymers, propylene-ethylene copolymers, 1-butene-ethylene copolymers, and 1-octene-ethylene copolymers are preferred. This copolymer may contain a small amount of a diene component. The olefin-based thermoplastic elastomer may have a density of 0.85 to 0.90 (g / cm 3 Such an α-olefin-ethylene copolymer can be produced, for example, by copolymerizing ethylene and an α-olefin in a solution state in the presence of a Ziegler catalyst or a metallocene catalyst.

[0074] Examples of styrene-based thermoplastic elastomers include styrene-ethylene-butylene-styrene block copolymer (SEBS), styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS), and styrene-ethylene-propylene-styrene block copolymer (SEPS).

[0075] The melt mass flow rate of the modified polymer (C) is not particularly limited, but in order to improve dispersibility in the resin, it is preferably 0.1 g / 10 min or more, more preferably 0.2 g / 10 min or more, more preferably 0.3 g / 10 min or more, more preferably 0.4 g / 10 min or more, more preferably 0.5 g / 10 min or more, and more preferably 1.0 g / 10 min or more. On the other hand, in order to suppress the deterioration of processability, the melt mass flow rate is preferably 660 g / 10 min or less, more preferably 500 g / 10 min or less, more preferably 250 g / 10 min or less, more preferably 100 g / 10 min or less, more preferably 80 g / 10 min or less, more preferably 70 g / 10 min or less, more preferably 60 g / 10 min or less, and more preferably 50 g / 10 min or less. The melt mass flow rate of the modified polymer (C) can be calculated according to JIS K7210. The temperature and load in measuring the melt mass flow rate are 180°C and 2.16 kgf (21.18 N).

[0076] In order to improve the appearance of the molded article, the acid value of the modified polymer (C) is preferably 1 mg KOH / g or more, more preferably 2 mg KOH / g or more, more preferably 3 mg KOH / g or more, still more preferably 5 mg KOH / g or more, still more preferably 6 mg KOH / g or more, and still more preferably 8 mg KOH / g or more.

[0077] On the other hand, if the acid value of the modified polymer (C) is too high, the modified polymer (C) may react excessively with the polyester resin and / or polyamide resin (A), making it difficult for the modified polymer (C) to obtain suitable compatibility with the polyester resin and / or polyamide resin (A) and the polyolefin resin (B). Therefore, the acid value is preferably 100 mg KOH / g or less, more preferably 80 mg KOH / g or less, more preferably 70 mg KOH / g or less, more preferably 55 mg KOH / g or less, more preferably 40 mg KOH / g or less, more preferably 30 mg KOH / g or less, and more preferably 20 mg KOH / g or less.

[0078] The acid value of the modified polymer (C) can be measured by FT-IR measurement. The modified polymer (C) is heat-pressed at 5 MPa for 5 minutes at a temperature equal to or higher than the melting temperature to produce a molded product. The molded product is subjected to FT-IR measurement to obtain an acid value of 1780 cm -1 The modification rate of carboxylic acid and / or carboxylic acid derivatives is quantified based on the absorption of 11.44. The modification rate is multiplied by the coefficient 11.44 to calculate the acid value.

[0079] The mass average molecular weight of the modified polymer (C) is not particularly limited, but is preferably 10,000 or more, more preferably 20,000 or more, more preferably 30,000 or more, more preferably 40,000 or more, more preferably 50,000 or more, more preferably 60,000 or more, more preferably 80,000 or more, and more preferably 100,000 or more in order to improve impact resistance. In addition, if the mass average molecular weight of the modified polymer (C) is too high, the dispersibility in the resin composition is deteriorated, so the mass average molecular weight is preferably 1,000,000 or less, more preferably 750,000 or less, more preferably 500,000 or less, more preferably 250,000 or less, and more preferably 200,000 or less. The mass average molecular weight of the modified polymer (C) is a value calculated in terms of standard polystyrene, which is measured by dissolving the modified polymer (C) in an organic solvent such as THF and measuring it by gel permeation chromatography.

[0080] <1-4. Resin composition> In the resin composition according to one embodiment of the present invention, the content of the polyester resin and / or polyamide resin (A) in the total of 100 parts by mass of the polyester resin and / or polyamide resin (A), the polyolefin resin (B), and the modified polymer (C) is not particularly limited, but in order to improve the heat resistance of the obtained molded article, it is preferably 1 part by mass or more, more preferably 5 parts by mass or more, more preferably 7.5 parts by mass or more, and more preferably 10 parts by mass or more. On the other hand, in order to reduce the weight of the obtained molded article, the content of the polyester resin and / or polyamide resin (A) is preferably 99 parts by mass or less, more preferably 95 parts by mass or less, more preferably 92.5 parts by mass or less, and more preferably 90 parts by mass or less.

[0081] In the resin composition, the content of the polyolefin resin (B) in the total of 100 parts by mass of the polyester resin and / or polyamide resin (A), the polyolefin resin (B), and the modified polymer (C) is not particularly limited, but in order to reduce the weight of the resulting molded article, it is preferably 1 part by mass or more, more preferably 5 parts by mass or more, more preferably 7.5 parts by mass or more, and more preferably 10 parts by mass or more. On the other hand, in order to improve the heat resistance of the resulting molded article, the content of the polyolefin resin (B) is preferably 99 parts by mass or less, more preferably 95 parts by mass or less, more preferably 92.5 parts by mass or less, and more preferably 90 parts by mass or less.

[0082] In the resin composition, the content of the modified polymer (C) in the total of 100 parts by mass of the polyester resin and / or polyamide resin (A), the polyolefin resin (B), and the modified polymer (C) is not particularly limited, but in order to increase the affinity between the polyester resin and / or polyamide resin (A), the polyolefin resin (B), and other components described later, it is preferably 0.1 parts by mass or more, more preferably 0.3 parts by mass or more, and more preferably 0.5 parts by mass or more. On the other hand, in order to improve the appearance of the molded product, the content of the modified polymer (C) is preferably less than 20 parts by mass, more preferably 10 parts by mass or less, more preferably 7.5 parts by mass or less, and more preferably 5 parts by mass or less.

[0083] The total amount of the polyester resin and / or polyamide resin (A) and the polyolefin resin (B) in 100 parts by mass of the resin composition is not particularly limited, but in order to improve processability, it is preferably 10 parts by mass or more, more preferably 20 parts by mass or more, and more preferably 30 parts by mass or more. On the other hand, in order to improve the appearance of the molded product, the total amount is preferably 99.9 parts by mass or less, more preferably 99.8 parts by mass or less, and more preferably 99.7 parts by mass or less.

[0084] The resin composition may contain other components in addition to the polyester resin and / or polyamide resin (A), the polyolefin resin (B), and the modified polymer (C).

[0085] Examples of other components include fillers. In one embodiment of the present invention, the filler refers to a component that is added for the purpose of imparting mechanical strength, light reflection / scattering, flame retardancy, sound insulation, vibration damping, etc., and has a melting point equal to or higher than the processing temperature of the resin composition.

[0086] The filler is not particularly limited, and may be an inorganic filler or an organic filler. The inorganic filler is not particularly limited, and may be glass fiber, glass beads, talc, barium sulfate, wollastonite, kaolin, fine silica powder, mica, calcium silicate, aluminum oxide, magnesium oxide, etc. The organic filler is not particularly limited, and may be wood powder, paper powder, cellulose fiber, carbon fiber, etc.

[0087] Among the above, the filler is preferably an inorganic filler, paper powder or cellulose fiber, and more preferably a glass filler, glass beads, paper powder or cellulose fiber.

[0088] When the resin composition contains a filler, the proportion is not particularly limited, but in terms of mechanical strength, the proportion is preferably 10 parts by mass or more, more preferably 15 parts by mass or more, and more preferably 20 parts by mass or more, relative to 100 parts by mass of the resin composition. On the other hand, in terms of moldability, the proportion of the filler is preferably 70 parts by mass or less, more preferably 60 parts by mass or less, and more preferably 50 parts by mass or less.

[0089] In addition, examples of other components other than the filler include polyester resin and / or other resins other than polyamide resin (A) and polyolefin resin (B), flame retardants (e.g., phosphorus-based, bromine-based, silicone-based, and organic metal salt-based, etc.), anti-drip agents (e.g., fluorinated polyolefin, silicone, and aramid fiber, etc.), lubricants (e.g., long-chain fatty acid metal salts such as magnesium stearate, etc.), release agents (e.g., pentaerythritol tetrastearate, etc.), nucleating agents, antistatic agents, stabilizers (e.g., phenol-based stabilizers, sulfur-based stabilizers, phosphorus-based stabilizers, ultraviolet absorbers, and amine-based light stabilizers, etc.), plasticizers, dyes, and pigments. Note that these other components can be well-known materials, and can be selected and used according to the application of the resin composition, and each other component in the resin composition can also be selected arbitrarily.

[0090] The proportion of other components in 100 parts by mass of the resin composition is not particularly limited, but is usually 0.1 parts by mass or more, and preferably 60 parts by mass or less, and more preferably 50 parts by mass or less.

[0091] Any method may be used to produce the resin composition according to one embodiment of the present invention. For example, a polyester resin and / or polyamide resin (A), a polyolefin resin (B), a modified polymer (C), and other components as necessary are mixed. The mixing may be performed using a premixing means such as a V-type blender, a Henschel mixer, a mechanochemical device, or an extrusion mixer. In addition, the mixture obtained by mixing may be granulated using an extrusion granulator or a briquetting machine, and then melt-kneaded and extruded using a melt kneader.

[0092] Examples of the melt kneader include twin-screw extruders such as vented twin-screw extruders, Banbury mixers, kneading rolls, single-screw extruders, and multi-screw extruders having three or more screws. The temperature during melt kneading is, for example, 200 to 320° C. The resin composition extruded as described above is directly cut and pelletized by a device such as a pelletizer, or cooled to form strands, and the strands are then cut and pelletized by a device such as a pelletizer.

[0093] <2. Molded body> A molded article can be obtained by molding the resin composition according to one embodiment of the present invention. Examples of applications of the resin composition include molded articles obtained by recycling automobile, motorcycle, and ship parts, electrical and electronic parts, miscellaneous goods, fibers, films, molded articles, and molded articles useful in other fields.

[0094] The molded article contains the resin composition according to one embodiment of the present invention. That is, the molded article contains a polyester resin and / or a polyamide resin (A), a polyolefin resin (B), and a modified polymer (C). The preferred ratio of each component in the molded article is the same as the preferred ratio described for the above-mentioned resin composition. The shape of the molded article is not particularly limited, and may be various shapes such as a resin plate, a sheet, a film, a cable, a fiber, or an irregular shape.

[0095] The film and sheet obtained from the resin composition according to one embodiment of the present invention may be laminated with two or more other substrates, such as polyolefins such as polyethylene or polypropylene, polyvinyl chloride, polyamide, ethylene-vinyl alcohol copolymer, aluminum foil, and paper, depending on the application.

[0096] Depending on the application, the fiber obtained from the resin composition according to one embodiment of the present invention may have two or more layers with other substrates such as polyolefins such as polyethylene or polypropylene, polyvinyl chloride, polyamide, ethylene-vinyl alcohol copolymer, and polyester.

[0097] The molding method for obtaining the molded article according to one embodiment of the present invention is not particularly limited, and examples thereof include extrusion processing, calendar processing, injection molding, rolling, compression molding, blow molding, etc. The temperature when molding the resin composition according to one embodiment of the present invention is, for example, 200 to 320°C.

[0098] The present invention is not limited to the above-described aspects, and various modifications are possible within the scope of the claims. The aspects obtained by appropriately combining the technical means disclosed as different aspects are also included in the technical scope of the present invention. EXAMPLES

[0099] Hereinafter, one aspect of the present invention will be specifically described with reference to examples. However, the present invention is not limited to the following examples in any way. In the following examples, % is by mass unless otherwise specified.

[0100] [Examples 1 to 15, Comparative Examples 1 to 8] The raw materials were blended in the ratios shown in Tables 1 to 5 and mixed by hand blending. Then, using a φ30 mm counter-rotating twin screw extruder (model name "PCM-30", manufactured by Ikegai Corporation), the mixture was melt-kneaded at a screw rotation speed of 150 rpm and a cylinder temperature of 250 to 270°C to obtain a resin composition.

[0101] The details of each raw material shown in Tables 1 to 5 are as follows: Polyamide resin (A-1): Nylon 6 resin (Ube Industries, Ltd., Ube Nylon 1022B, number average molecular weight 22,000) Polyamide resin (A-2): Nylon 66 resin (manufactured by Toyobo Co., Ltd., Glamid T-662, number average molecular weight 47,000) Polyester resin (A-3): Polyethylene terephthalate resin (Bell Polyester Products Co., Ltd., Bellpet (registered trademark) EFG70, intrinsic viscosity (IV) = 0.75 dl / g) Polyester resin (A-4): Polyethylene terephthalate resin (Teijin Limited, TRN-MTJ, intrinsic viscosity (IV) = 0.53 dl / g) Polyolefin resin (B-1): Linear low-density polyethylene resin (Prime Polymer Co., Ltd., Evolue SP2520, melt mass flow rate 1.9 g / 10 min) Polyolefin resin (B-2): High density polyethylene resin (Japan Polypropylene Corporation, Novatec HD HJ580, melt mass flow rate 12g / 10min) Polyolefin resin (B-3): Polypropylene resin (Japan Polypropylene Corporation, Novatec PP FY-4, melt mass flow rate 5.0g / 10min) Polyolefin resin (B-4): Polypropylene resin (Japan Polypropylene Corporation, Novatec PP MA1B, melt mass flow rate 21g / 10min) Modified polymer (C-1): Maleic anhydride modified polyethylene (acid value 10 mgKOH / g, melt mass flow rate 1.2 g / 10 min, mass average molecular weight 149,000, density 0.92 g / cm 3 ) Modified polymer (C-2): Maleic anhydride modified polypropylene (acid value 10 mgKOH / g, melt mass flow rate 45 g / 10 min, mass average molecular weight 150,000, density 0.91 g / cm 3 ) Modified polymer (C-3): Maleic anhydride modified elastomer (acid value 4 mg KOH / g, melt mass flow rate 1.1 g / 10 min, elastomer: α-olefin-ethylene copolymer, density 0.88 g / cm 3 )

[0102] The melt mass flow rates of the modified polymers (C-1), (C-2) and (C-3) were measured under conditions of 180° C. and 2.16 kgf (21.18 N).

[0103] The obtained resin composition was injection molded using a 100t injection molding machine (model name "SE-100DU", manufactured by Sumitomo Heavy Industries, Ltd.) under the condition of a molding temperature of 220 to 270°C to obtain a molded product (Charpy impact strength test piece) of length 80 mm x width 10 mm x thickness 4 mm, a tensile test piece specified in JIS-7139, and an injection molded product in the form of pellets. The obtained pellets were dehumidified and dried at 80°C overnight, and a film was produced using a 25 mmφ single-screw extruder (L / D=20) equipped with a 300 mm wide T-die and a screen mesh under the following conditions: Examples 1 and 2 and Comparative Example 1: Cylinder temperature 230 to 250°C, T-die temperature 250°C, film thickness about 450 μm Examples 3 and 4 and Comparative Example 2: Cylinder temperature 250 to 270°C, T-die temperature 270°C, film thickness about 450 μm Examples 5 and 6 and Comparative Example 3: Cylinder temperature 250 to 270°C, T-die temperature 270°C, film thickness about 140 μm

[0104] The processing temperatures for the injection molded articles of Examples 7 to 14 and Comparative Examples 4 to 7 were a cylinder temperature of 270° C. and a molding temperature of 270° C. The processing temperatures for the injection molded articles of Example 15 and Comparative Example 8 were a cylinder temperature of 270° C. and a molding temperature of 220° C.

[0105] The following evaluations were carried out using each molded body.

[0106] [Charpy impact test] The Charpy impact strength was measured in accordance with ISO-179-1 using a TYPE A notch in accordance with ISO2818.

[0107] [Tensile test] The tensile modulus and tensile elongation at break were measured in accordance with ISO-527. In Examples 5, 7 to 10, 15, Comparative Examples 3 to 5, and 8, the measurements were performed at a tensile speed of 5 mm / min. In Examples 11 to 14, Comparative Examples 6 and 7, the measurements were performed at a tensile speed of 50 mm / min.

[0108] [Appearance evaluation] The appearance was evaluated by counting the number of fisheyes in the obtained molded product (film). 2 The fisheyes were larger than 324cm in total. 2 Set it to 324cm 2 The total number of fish eyes in the sample was measured.

[0109] [Transmittance (HAZE)] The transmittance (HAZE) was measured using the obtained molded product (film) in accordance with JIS K-7361.

[0110] [Puncture strength] In accordance with JIS Z 1707, a needle with a diameter of 1.0 mm was pierced at a speed of 50 mm per minute, and the maximum stress until the needle penetrated was measured.

[0111] [result] The results obtained are shown in Tables 1 to 5.

[0112] [Table 1]

[0113] [Table 2]

[0114] [Table 3]

[0115] [Table 4]

[0116] [Table 5]

[0117] As is clear from the comparison of Examples 1-2 with Comparative Example 1, and Examples 3-4 with Comparative Example 2, in the molded article of the resin composition containing polyester resin or polyamide resin and polyolefin resin, the mechanical properties represented by puncture strength were greatly improved by using modified polymer (C) in combination. In addition, since the haze was small, the color unevenness was reduced, and a molded article with excellent appearance could be obtained.

[0118] In addition, as is clear from a comparison between Examples 5 and 6 and Comparative Example 3, in a molded article of a resin composition containing a polyester resin, a polyamide resin, and a polyolefin resin, by using modified polymer (C) in combination, it was possible to obtain a molded article with excellent appearance, in which the number of fish eyes was reduced and color unevenness was reduced due to small haze. Furthermore, a comparison between Example 5 and Comparative Example 3 shows that the mechanical properties represented by the tensile modulus were improved by using modified polymer (C) in combination.

[0119] Furthermore, as is clear from a comparison between Examples 7-8 and Comparative Example 4, Examples 9-10 and Comparative Example 5, and Example 15 and Comparative Example 8, in a molded article of a resin composition containing a polyester resin and a polyolefin resin, the mechanical properties represented by the tensile elongation at break and / or the Charpy impact strength were greatly improved by using the modified polymer (C) in combination.

[0120] Furthermore, as is clear from a comparison between Examples 11 and 12 and Comparative Example 6, and between Examples 13 and 14 and Comparative Example 7, in a molded article of a resin composition containing a polyamide resin and a polyolefin resin, the mechanical properties represented by the tensile modulus and / or tensile elongation at break and the Charpy impact strength were significantly improved by using the modified polymer (C) in combination.

[0121] As described above, it has been confirmed that when a modified polymer (C) modified with a carboxylic acid and / or a carboxylic acid derivative, such as modified polymer (C-1), (C-2) or (C-3), is used in a resin composition containing a polyester resin and / or a polyamide resin (A) and a polyolefin resin (B), the mechanical properties, particularly those represented by the tensile modulus, tensile elongation at break and Charpy impact strength, are significantly improved, and a molded article having excellent appearance, with small haze and fisheye counts and reduced color unevenness, can be obtained. [Industrial Applicability]

[0122] In the resin composition according to one aspect of the present invention, the polyester resin and / or the polyamide resin and the polyolefin resin are well compatible with each other, and the resin composition can provide a molded article having high mechanical properties and excellent appearance.

[0123] The molded article obtained by using the resin composition according to one embodiment of the present invention can be suitably used as a molded article obtained by recycling automobile, motorcycle, and ship parts, electric and electronic parts, miscellaneous goods, fibers, films, molded articles, and the like, and a molded article useful in other fields.

Claims

1. A polyester resin and / or a polyamide resin (A), A polyolefin resin (B), and a modified polymer (C) modified with a carboxylic acid and / or a carboxylic acid derivative.

2. The resin composition according to claim 1, wherein the polyester resin and / or polyamide resin (A) comprises at least one polyester resin selected from polyethylene terephthalate, polybutylene terephthalate, and polylactic acid.

3. The resin composition according to claim 1 , wherein the polyolefin resin (B) is polypropylene.

4. The resin composition according to claim 1 , wherein the polyolefin resin (B) is polyethylene.

5. The resin composition according to claim 1, wherein the modified polymer (C) has an acid value of 70 mg·KOH / g or less.

6. The resin composition according to claim 1 , wherein the modified polymer (C) has a mass average molecular weight of 50,000 or more.

7. The resin composition according to claim 1, wherein the modified polymer (C) has a melt mass flow rate of 0.1 g / 10 min or more at 180° C. and 2.16 kgf (21.18 N).

8. The resin composition according to claim 1, wherein the modified polymer (C) is a copolymer of the carboxylic acid and / or carboxylic acid derivative with a polyolefin or an elastomer.

9. The resin composition according to claim 1 , wherein the structural unit derived from the carboxylic acid and / or the carboxylic acid derivative is present in a graft chain of the modified polymer (C).

10. The resin composition according to claim 8 , wherein the carboxylic acid and / or carboxylic acid derivative is a dicarboxylic acid anhydride.

11. The resin composition according to claim 8, wherein the polyolefin is polyethylene or polypropylene.

12. 2. The resin composition according to claim 1, wherein the content of the modified polymer (C) in a total of 100 parts by mass of the polyester resin and / or polyamide resin (A), the polyolefin resin (B), and the modified polymer (C) is 0.1 parts by mass or more and less than 20 parts by mass.

13. In a total of 100 parts by mass of the polyester resin and / or polyamide resin (A), the polyolefin resin (B), and the modified polymer (C), The content of the polyester resin and / or polyamide resin (A) is 1 part by mass or more and 99 parts by mass or less, The resin composition according to claim 1, wherein the content of the polyolefin resin (B) is 1 part by mass or more and 99 parts by mass or less.

14. A molded article comprising the resin composition according to any one of claims 1 to 13.

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