Nucleating agent, resin composition, method for producing resin composition, and molded product

Abstract

Provided are a nucleating agent capable of imparting molded articles with exceptional mechanical properties, a resin composition, a method for producing a resin composition, and a molded article.　A nucleating agent that contains (A) an aromatic phosphoric acid ester metal salt having a structure represented by general formula (1) (where each of R1-R5 independently represents a hydrogen atom or an alkyl group; n represents 1 or 2; when n is 1, M1 represents an alkali metal or dihydroxyaluminum; when n is 2, M1 represents an alkaline-earth metal, zinc, or hydroxyaluminum) and (B) a carboxylic acid metal salt having a structure represented by general formula (2) (where M2 represents an alkali metal, an alkaline-earth metal, hydroxyaluminum, or dihydroxyaluminum; a represents 1 or 2, x represents 1 or 2, and ax=2; and Z represents a group having a structure represented by formula (3) or (4)).

Description

Nucleating agent, resin composition, method for producing resin composition, and molded product

[0001] The present invention relates to a nucleating agent, a resin composition, a method for producing a resin composition (hereinafter also simply referred to as the "production method"), and a molded article, and more particularly to a nucleating agent, a resin composition, a method for producing a resin composition, and a molded article that can impart excellent mechanical properties to a molded article.

[0002] Among various general-purpose thermoplastic resins, polyolefin resins are one of the most versatile plastic materials in terms of physical properties, moldability, price, etc., and are used in a wide range of applications.

[0003] Molded articles made of polyolefin-based resins are sometimes required to have excellent rigidity. One known method for imparting excellent rigidity to molded articles made of polyolefin-based resins is to add a nucleating agent to the polyolefin-based resin. For example, Patent Document 1 below proposes a nucleating agent containing an aromatic phosphate ester metal salt as a nucleating agent to be added to the polyolefin-based resin.

[0004] Japanese Unexamined Patent Publication No. 1736 / 1983

[0005] However, the nucleating agent described in Patent Document 1 has room for further improvement in terms of imparting sufficient mechanical properties to a molded article.

[0006] Therefore, an object of the present invention is to provide a nucleating agent, a resin composition, a method for producing a resin composition, and a molded article that can impart excellent mechanical properties to the molded article.

[0007] As a result of extensive research, the present inventors have found that the above-mentioned problems can be solved by using a nucleating agent containing a specific aromatic phosphate metal salt and a specific carboxylate metal salt, and have thus completed the present invention.

[0008] That is, the nucleating agent of the present invention is (A) a compound represented by the following general formula (1): (In the above general formula (1), R １ ~R ５ each independently represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms; n represents 1 or 2; when n is 1, M １represents an alkali metal or dihydroxyaluminum, and when n is 2, M １ represents an alkaline earth metal, zinc, or hydroxyaluminum), and (B) an aromatic phosphate metal salt having a structure represented by the following general formula (2): (In the above general formula (2), M ２ represents an alkali metal, an alkaline earth metal, hydroxyaluminum, or dihydroxyaluminum, a represents 1 or 2, x represents 1 or 2, and ax=2 is satisfied. Z represents a group having a structure represented by the following general formula (3) or (4): (In the above general formulas (3) and (4), Y represents a direct bond or an alkylene group having 1 to 4 carbon atoms, and R ６ ~R １５ each independently represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms, and * represents the position at which it bonds to the carbonyl carbon.

[0009] M in the general formula (2) ２ is preferably sodium.

[0010] The mass ratio (A) / (B) of the content of the aromatic phosphate metal salt (A) to the content of the carboxylate metal salt (B) is preferably 1 / 99 to 50 / 50.

[0011] Furthermore, the mass ratio (A) / (B) of the content of the aromatic phosphate metal salt (A) to the content of the carboxylate metal salt (B) is preferably 50 / 50 to 99 / 1, and more preferably 50 / 50 to 80 / 20.

[0012] The resin composition of the present invention comprises a polyolefin resin and (A) a compound represented by the following general formula (1): (In the above general formula (1), R １ ~R ５ each independently represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms; n represents 1 or 2; when n is 1, M １represents an alkali metal or dihydroxyaluminum, and when n is 2, M １ represents an alkaline earth metal, zinc, or hydroxyaluminum), and (B) an aromatic phosphate metal salt having a structure represented by the following general formula (2): (In the above general formula (2), M ２ represents an alkali metal, an alkaline earth metal, hydroxyaluminum, or dihydroxyaluminum, a represents 1 or 2, x represents 1 or 2, and ax=2 is satisfied. Z represents a group having a structure represented by the following general formula (3) or (4): (In the above general formulas (3) and (4), Y represents a direct bond or an alkylene group having 1 to 4 carbon atoms, and R ６ ~R １５ each independently represent a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms, and * represents the position at which it bonds to the carbonyl carbon; and a carboxylic acid metal salt having a structure represented by the following formula:

[0013] The polyolefin resin is preferably a polypropylene resin.

[0014] The method for producing a resin composition of the present invention is characterized by comprising a compounding step of compounding the above-mentioned nucleating agent with a polyolefin resin.

[0015] Furthermore, the molded article of the present invention is characterized by being obtained by molding the above-mentioned resin composition.

[0016] According to the present invention, it is possible to provide a nucleating agent, a resin composition, a method for producing a resin composition, and a molded article that can impart excellent mechanical properties to a molded article.

[0017] Hereinafter, embodiments of the present invention will be described in detail. First, an embodiment of the nucleating agent of the present invention will be described.

[0018] <Nucleating Agent> The nucleating agent according to this embodiment contains (A) an aromatic phosphate metal salt having a structure represented by the following general formula (1) and (B) a carboxylate metal salt having a structure represented by the following general formula (2).

[0019] Here, in general formula (1), R １ ~R ５ each independently represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms; n represents 1 or 2; when n is 1, M １ represents an alkali metal or dihydroxyaluminum, and when n is 2, M １ represents an alkaline earth metal, zinc, or hydroxyaluminum. ２ represents an alkali metal, an alkaline earth metal, hydroxyaluminum, or dihydroxyaluminum, a represents 1 or 2, x represents 1 or 2, and ax = 2 is satisfied. Z represents a group having a structure represented by the following general formula (3) or (4):

[0020] In the general formulas (3) and (4), Y represents a direct bond or an alkylene group having 1 to 4 carbon atoms, and R ６ ~R １５ each independently represents a hydrogen atom, a halogen atom or an alkyl group having 1 to 6 carbon atoms, and * represents the position at which the group is bonded to the carbonyl carbon.

[0021] The nucleating agent according to this embodiment can impart excellent mechanical properties to a molded article.

[0022] (A) Aromatic phosphate metal salt has a structure represented by the above general formula (1). In general formula (1), M １ Specific examples of M include lithium, sodium, potassium, magnesium, calcium, barium, hydroxyaluminum, dihydroxyaluminum, and zinc. １is preferably lithium, sodium, hydroxyaluminum, or dihydroxyaluminum, and particularly preferably sodium. Also, n in general formula (1) is preferably 1.

[0023] In general formula (1), R １ ~R ５ Examples of the alkyl group having 1 to 6 carbon atoms represented by the formula (I) include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, a cyclopropyl group, an n-butyl group, a sec-butyl group, a tert-butyl group, an isobutyl group, a cyclobutyl group, an n-amyl group, a tert-amyl group, a cyclopentyl group, an n-hexyl group, and a cyclohexyl group. １ ~R ４ is particularly preferably a tert-butyl group. From the viewpoint of imparting even better mechanical properties to the molded article, R ５ is preferably a hydrogen atom or a methyl group, and particularly preferably a hydrogen atom.

[0024] Specific examples of (A) aromatic phosphate metal salt include the following. These may be contained alone or in combination of two or more. However, (A) aromatic phosphate metal salt is not limited to these.

[0025]

[0026] (B) The metal carboxylate has a structure represented by the above general formula (2). In general formula (2), M ２ Specific examples of M include lithium, sodium, potassium, magnesium, calcium, barium, hydroxyaluminum, dihydroxyaluminum, etc. From the viewpoint of imparting better mechanical properties to molded articles, M ２ is preferably sodium, calcium, hydroxyaluminum or dihydroxyaluminum, more preferably sodium or hydroxyaluminum, and particularly preferably sodium. In general formula (2), x is preferably 1 and a is preferably 2.

[0027] Z in general formula (2) is preferably a group having a structure represented by general formula (4), in which case the molded article can be imparted with even better mechanical properties.

[0028] Examples of the alkylene group having 1 to 4 carbon atoms represented by Y in general formulas (3) and (4) include a methylene group, an ethylene group, a propylene group, a butylene group, an isobutylene group, etc. From the viewpoint of imparting better mechanical properties to a molded article, Y is preferably a direct bond or a methylene group, and more preferably a direct bond.

[0029] R in general formulas (3) and (4) ６ ~R １５ Examples of the halogen atom represented by the formula (I) include fluorine, chlorine, bromine, and iodine. Among these, chlorine is particularly preferred from the viewpoint of imparting better mechanical properties to the molded article.

[0030] R in general formulas (3) and (4) ６ ~R １５ Examples of the alkyl group having 1 to 6 carbon atoms represented by the formula (I) include a linear or branched alkyl group, and a cycloalkyl group having 3 to 6 carbon atoms. Specific examples of the alkyl group having 1 to 6 carbon atoms include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, a cyclopropyl group, an n-butyl group, a sec-butyl group, a tert-butyl group, an isobutyl group, a cyclobutyl group, an n-amyl group, a tert-amyl group, a cyclopentyl group, an n-hexyl group, and a cyclohexyl group.

[0031] R in general formulas (3) and (4) ６ ~R １５ From the viewpoint of imparting better mechanical properties to the molded article, a hydrogen atom or a halogen atom is preferred, and a hydrogen atom is particularly preferred.

[0032] Specific examples of the (B) metal carboxylate include the following. These may be contained alone or in combination of two or more. However, the (B) metal carboxylate is not limited to these.

[0033]

[0034] (B) The carboxylic acid metal salt can be produced, for example, by a method in which aspartic acid is reacted with a carboxylic acid chloride such as benzoic acid chloride or cyclohexanecarboxylic acid chloride in the presence of a base such as sodium hydroxide.

[0035] In the nucleating agent according to this embodiment, the mass ratio (A) / (B) of the content of the (A) aromatic phosphate metal salt to the content of the (B) carboxylate metal salt may be, for example, 1 / 99 to 99 / 1. Furthermore, the mass ratio (A) / (B) is preferably 1 / 99 to 50 / 50. In this case, excellent impact resistance can be imparted to the molded article. From the viewpoint of obtaining a molded article that has excellent impact resistance and sufficient rigidity, (A) / (B) is more preferably 1 / 99 to 20 / 80, even more preferably 4 / 96 to 20 / 80, and even more preferably 4 / 96 to 16 / 84.

[0036] Furthermore, in the nucleating agent according to this embodiment, it is also preferable that the mass ratio (A) / (B) is 50 / 50 to 99 / 1. In this case, superior rigidity can be imparted to the molded article. From the viewpoint of imparting superior rigidity to the molded article, (A) / (B) is more preferably 50 / 50 to 96 / 4, even more preferably 50 / 50 to 84 / 16, still more preferably 50 / 50 to 80 / 20, and particularly preferably 60 / 40 to 80 / 20.

[0037] The nucleating agent according to the present embodiment may further contain (C) a metal salt of a fatty acid, which improves the dispersibility of (A) the metal salt of an aromatic phosphate and (B) the metal salt of a carboxylate, thereby imparting better mechanical properties to the molded article.

[0038] Examples of (C) fatty acid metal salts include metal salts of fatty acids having 12 to 20 carbon atoms and containing linear or branched fatty acid residues. Examples of metal ions constituting fatty acid metal salts include sodium ions, potassium ions, lithium ions, dihydroxyaluminum ions, calcium ions, zinc ions, barium ions, magnesium ions, and hydroxyaluminum ions. Of these, sodium ions, potassium ions, lithium ions, and calcium ions are particularly preferred.

[0039] Specific examples of (C) fatty acid metal salts include sodium laurate, sodium myristate, sodium palmitate, sodium stearate, sodium oleate, sodium linoleate, sodium linolenate, sodium arachidate, sodium 12-hydroxystearate, potassium laurate, potassium myristate, potassium palmitate, potassium stearate, potassium oleate, potassium linoleate, potassium linolenate, potassium arachidate, potassium 12-hydroxystearate, lithium laurate, lithium myristate, lithium palmitate, lithium stearate, lithium oleate, lithium linoleate, lithium linolenate, lithium arachidate, lithium 12-hydroxystearate, calcium laurate, calcium myristate, and calcium palmitate. Examples of the calcium stearate include sodium myristate, calcium stearate, calcium oleate, calcium linoleate, calcium linolenate, calcium arachidate, and calcium 12-hydroxystearate. Among these, sodium myristate, sodium stearate, sodium 12-hydroxystearate, lithium myristate, lithium stearate, lithium 12-hydroxystearate, calcium myristate, calcium stearate, and calcium 12-hydroxystearate are preferred, lithium myristate, lithium stearate, lithium 12-hydroxystearate, calcium myristate, calcium stearate, and calcium 12-hydroxystearate are more preferred, and lithium myristate, lithium stearate, and lithium 12-hydroxystearate are even more preferred.

[0040] When the nucleating agent according to the present embodiment contains (C) a fatty acid metal salt, the content of (C) a fatty acid metal salt may be, for example, 10 to 150 parts by mass, preferably 30 to 120 parts by mass, and more preferably 50 to 100 parts by mass, relative to 100 parts by mass of the total content of (A) the aromatic phosphate ester metal salt and the (B) carboxylate metal salt.

[0041] The nucleating agent according to the present embodiment may further contain, as necessary, various additives such as a compound other than (A) the aromatic phosphate metal salt and (B) the carboxylate metal salt, which has a function of promoting crystallization of the polyolefin resin, a phenolic antioxidant, a phosphorus-based antioxidant, a sulfur-based antioxidant, other antioxidants, a hindered amine compound, an ultraviolet absorber, a flame retardant, a flame retardant aid, a lubricant, a filler, hydrotalcites, an antistatic agent, a fluorescent brightener, a pigment, and a dye.

[0042] Examples of compounds that are different from (A) the aromatic phosphate metal salt and (B) the carboxylate metal salt and have the function of promoting the crystallization of polyolefin resins include, for example, carboxylate metal salts such as sodium benzoate, 4-tert-butylbenzoic acid aluminum salt, sodium adipate, disodium bicyclo[2.2.1]heptane-2,3-dicarboxylate, and calcium cyclohexane-1,2-dicarboxylate, dibenzylidene sorbitol, bis(methylbenzylidene)sorbitol, bis(3,4-dimethylbenzylidene)sorbitol, and bicarbonate. and polyol derivatives such as bis(p-ethylbenzylidene)sorbitol, bis(dimethylbenzylidene)sorbitol, and 1,2,3-trideoxy-4,6:5,7-o-bis(4-propylbenzylidene)nonitol; and amide compounds such as N,N',N"-tris[2-methylcyclohexyl]-1,2,3-propanetricarboxyamide, N,N',N"-tricyclohexyl-1,3,5-benzenetricarboxyamide, N,N'-dicyclohexylnaphthalenedicarboxyamide, and 1,3,5-tri(dimethylisopropoylamino)benzene.

[0043] Examples of phenolic antioxidants include 2,6-di-tert-butyl-4-ethylphenol, 2-tert-butyl-4,6-dimethylphenol, styrenated phenol, 2,2'-methylenebis(4-ethyl-6-tert-butylphenol), 2,2'-thiobis-(6-tert-butyl-4-methylphenol), 2,2'-thiodiethylenebis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2-methyl-4,6-bis(octylsulfanylmethyl)phenol, 2,2'-isobutylidenebis(4,6-dimethylphenol), isooctyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and N,N'-hexane-1,6-diylbis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionamide], 2,2'-oxamido-bis[ethyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2-ethylhexyl-3-(3',5'-di-tert-butyl-4'-hydroxyphenyl)propionate, 2,2'-ethylenebis(4,6-di-tert-butylphenol), 3,5-di-tert-butyl-4-hydroxybenzenepropanoic acid and C13-15 alkyl ester, 2,5-di-tert-amylhydroquinone, hindered phenol polymer (manufactured by ADEKA POLYMER ADDITIVES EUROPE SAS) Product name "AO.OH.98"), 2,2'-methylenebis[6-(1-methylcyclohexyl)-p-cresol], 2-tert-butyl-6-(3-tert-butyl-2-hydroxy5-methylbenzyl)-4-methylphenyl acrylate, 2-[1-(2-hydroxy-3,5-di-tert-pentylphenyl)ethyl]-4,6-di-tert-pentylphenyl acrylate, 6-[3-(3-tert-butyl-4-hydroxy-5-methyl)propoxy]-2,4,8,10-tetra-tert-butylbenz[d,f][1,3,2]-dioxaphophobin, hexamethylenebis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], bis[monoethyl(3,5-di-tert-butyl-4-hydroxybenzyl)phosphonate] calcium salt, reaction products of 5,7-bis(1,1-dimethylethyl)-3-hydroxy-2(3H)-benzofuranone with o-xylene, 2,6-di-tert-butyl-4-(4,6-bis(octylthio)-1,3,5-triazin-2-ylamino)phenol, DL-α-tocopherol (vitamin E), 2,6-bis(α-methylbenzyl)-4-methylphenol, bis[3,3-bis-(4'-hydroxy-3'-tert-butyl-phenyl)butanoic acid]glycol ester, 2,6-di-tert-butyl-p-cresol, 2,6-diphenyl-4-octadecyloxyphenol, stearyl (3,5-di-tert-butyl-4-hydroxyphenyl)propionate, distearyl (3,5-di-tert-butyl-4-hydroxybenzyl)phosphonate, tridecyl-3,5-tert-butyl-4-hydroxybenzylthioacetate, thiodiethylenebis[(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 4,4'-thiobis(6-tert-butyl-m-cresol), 2,2'-methylenebis(4-methyl-6-tert-butylphenol), bis[3,3-bis(4-hydroxy-3-tert-butylphenyl)butylic acid]glycol ester, 4,4'-butylidenebis(2,6-di-tert-butylphenol), 4,4'-butylidenebis(6-tert-butyl-3-methylphenol), 2,2'-ethylidenebis(4,6-di-tert-butylphenol) , 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, bis[2-tert-butyl-4-methyl-6-(2-hydroxy-3-tert-butyl-5-methylbenzyl)phenyl]terephthalate, 1,3,5-tris(2,6-dimethyl-3-hydroxy-4-tert-butylbenzyl)isocyanurate, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-Trimethylbenzene, 1,3,5-tris[(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxyethyl]isocyanurate, tetrakis[methylene-3-(3',5'-tert-butyl-4'-hydroxyphenyl)propionate]methane, 2-tert-butyl-4-methyl-6-(2-acryloyloxy-3-tert-butyl-5-methylbenzyl)phenol, 3,9-bis[2-(3-tert-butyl-4-hydroxy-5-methylhydrocinnamoyloxy)-1,1-dimethylethyl]-2,4,8,10-tetraoxaspiro[5.5]undecane, triethylenediamine Examples of the alkyl esters include 3-(3,5-dialkyl-4-hydroxyphenyl)propionic acid derivatives such as ethylene glycol bis[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate], stearyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid amide, palmityl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid amide, myristyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid amide, and lauryl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid amide.

[0044] Examples of phosphorus-based antioxidants include triphenyl phosphite, diisooctyl phosphite, heptakis(dipropylene glycol)triphosphite, triisodecyl phosphite, diphenyl isooctyl phosphite, diisooctylphenyl phosphite, diphenyl tridecyl phosphite, triisooctyl phosphite, trilauryl phosphite, diphenyl phosphite, tris(dipropylene glycol)phosphite, dioleylhydrogen phosphite, trilauryl trithiophosphite, bis(tridecyl)phosphite, phosphite, tris(isodecyl)phosphite, tris(tridecyl)phosphite, diphenyldecyl phosphite, dinonylphenylbis(nonylphenyl)phosphite, poly(dipropylene glycol)phenyl phosphite, tetraphenyldipropylene glycol diphosphite, trisnonylphenyl phosphite, tris(2,4-di-tert-butylphenyl)phosphite, tris(2,4-di-tert-butyl-5-methylphenyl)phosphite, tris[2-tert-butyl-4-(3-tert-butyl-4-hydrogen (tridecyl) bisphenol A phosphite, tetraphenyl-tetra(tridecyl) pentaerythritol tetraphosphite, bis(2,4-di-tert-butyl-6-methylphenyl)ethyl phosphite, tetra(tridecyl)isopropyl bisphenol A di ... tetra(tridecyl)-4,4'-n-butylidenebis(2-tert-butyl-5-methylphenol)diphosphite, hexa(tridecyl)-1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane triphosphite, tetrakis(2,4-di-tert-butylphenyl)biphenylene diphosphonite, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, (1-methyl-1-propenyl-3-ylidene)tris(1,1-dimethylethyl)-5-methyl-4,1-phenylene)hexatridecyl phosphite, 2,2'-methylenebis(4,6-di-tert-butylphenyl)-2-ethylhexyl phosphite, 2,2'-methylenebis(4,6-di-tert-butylphenyl)-octadecyl phosphite, 2,2'-ethylidenebis(4,6-di-tert-butylphenyl)fluorophosphite, 4,4'-butylidenebis(3-methyl- 6-tert-butylphenylditridecyl)phosphite, tris(2-[(2,4,8,10-tetrakis-tert-butyldibenzo[d,f][1,3,2]dioxaphosphepin-6-yl)oxy]ethyl)amine, 3,9-bis(4-nonylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphespiro[5,5]undecane, 2,4,6-tri-tert-butyl Examples of such diphosphite include phenyl-2-butyl-2-ethyl-1,3-propanediol phosphite, poly4,4'-isopropylidenediphenol C12-15 alcohol phosphite, bis(diisodecyl)pentaerythritol diphosphite, bis(tridecyl)pentaerythritol diphosphite, bis(octadecyl)pentaerythritol diphosphite, bis(nonylphenyl)pentaerythritol diphosphite, bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, bis(2,4,6-tri-tert-butylphenyl)pentaerythritol diphosphite, bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite, and bis(2,4-dicumylphenyl)pentaerythritol diphosphite.

[0045] Examples of sulfur-based antioxidants include tetrakis[methylene-3-(laurylthio)propionate]methane, bis(methyl-4-[3-n-alkyl(C12 / C14)thiopropionyloxy]5-tert-butylphenyl)sulfide, ditridecyl-3,3'-thiodipropionate, dilauryl-3,3'-thiodipropionate, dimyristyl-3,3'-thiodipropionate, distearyl-3,3'-thiodipropionate, lauryl / stearyl thiodipropionate, 4,4'-thiobis(6-tert-butyl-m-cresol), 2,2'-thiobis(6-tert-butyl-p-cresol), and distearyl disulfide.

[0046] Other antioxidants include nitrone compounds such as N-benzyl-α-phenyl nitrone, N-ethyl-α-methyl nitrone, N-octyl-α-heptyl nitrone, N-lauryl-α-undecyl nitrone, N-tetradecyl-α-tridecyl nitrone, N-hexadecyl-α-pentadecyl nitrone, N-octyl-α-heptadecyl nitrone, N-hexadecyl-α-heptadecyl nitrone, N-octadecyl-α-pentadecyl nitrone, N-heptadecyl-α-heptadecyl nitrone, and N-octadecyl-α-heptadecyl nitrone; 3-arylbenzofuran-2(3H)-one, 3-(alkoxyphenyl)benzofuran-2-one, 3-(acyloxyphenyl)benzofuran-2(3H)-one, 5,7-di-tert-butyl ... Examples of benzofuran compounds include t-butyl-3-(3,4-dimethylphenyl)-benzofuran-2(3H)-one, 5,7-di-tert-butyl-3-(4-hydroxyphenyl)-benzofuran-2(3H)-one, 5,7-di-tert-butyl-3-{4-(2-hydroxyethoxy)phenyl}-benzofuran-2(3H)-one, 6-(2-(4-(5,7-di-tert-2-oxo-2,3-dihydrobenzofuran-3-yl)phenoxy)ethoxy)-6-oxohexyl-6-((6-hydroxyhexanoyl)oxy)hexanoate, and 5-di-tert-butyl-3-(4-((15-hydroxy-3,6,9,13-tetraoxapentadecyl)oxy)phenyl)benzofuran-2(3H)-one.

[0047] Examples of the hindered amine compound include 2,2,6,6-tetramethyl-4-piperidyl stearate, 1,2,2,6,6-pentamethyl-4-piperidyl stearate, 2,2,6,6-tetramethyl-4-piperidyl benzoate, bis(2,2,6,6-tetramethyl-4-piperidyl)sebacate, tetrakis(2,2,6,6-tetramethyl-4-piperidyl)-1,2,3,4-butanetetracarboxylate, and tetrakis(1,2,2,6,6-pentamethyl-4-piperidyl)-1,2,3,4-butanetetracarboxylate. Bis(2,2,6,6-tetramethyl-4-piperidyl)di(tridecyl)-1,2,3,4-butanetetracarboxylate, bis(1,2,2,6,6-pentamethyl-4-piperidyl)di(tridecyl)-1,2,3,4-butanetetracarboxylate, bis(1,2,2,4,4-pentamethyl-4-piperidyl)-2-butyl-2-(3,5-di-tert-butyl-4-hydroxybenzyl)malonate, 1-(2-hydroxyethyl)-2,2,6,6-tetramethyl-4-piperidinol / diethyl succinate polycondensate, 1,6-bis (2,2,6,6-tetramethyl-4-piperidylamino)hexane / 2,4-dichloro-6-morpholino-s-triazine polycondensate, 1,6-bis(2,2,6,6-tetramethyl-4-piperidylamino)hexane / 2,4-dichloro-6-tert-octylamino-s-triazine polycondensate, 1,5,8,12-tetrakis[2,4-bis(N-butyl-N-(2,2,6,6-tetramethyl-4-piperidyl)amino)-s-triazine-6-yl]-1,5,8,12-tetraazadodecane, 1,5,8,12-tetrakis[2,4-bis(N -butyl-N-(1,2,2,6,6-pentamethyl-4-piperidyl)amino)-s-triazin-6-yl]-1,5,8-12-tetraazadodecane, 1,6,11-tris[2,4-bis(N-butyl-N-(2,2,6,6-tetramethyl-4-piperidyl)amino-s-triazin-6-ylamino]undecane, 1,6,11-tris[2,4-bis(N-butyl-N-(1,2,2,6,6-pentamethyl-4-piperidyl)amino-s-triazin-6-ylamino]undecane, 3,9-bis[1,1-dimethyl-2-{tris(2,2,6,6-tetramethyl-4-piperidyloxycarbonyl)butylcarbonyloxy}ethyl]-2,4,8,10-tetraoxaspiro[5.5]undecane, 3,9-bis[1,1-dimethyl-2-{tris(1,2,2,6,6-pentamethyl-4-piperidyloxycarbonyl)butylcarbonyloxy}ethyl]-2,4,8,10-tetraoxaspiro[5.5]undecane, bis(1-undecyloxy-2,2,6,6-tetramethylpiperidin-4-yl)carbonate, 2,2,6,6-tetramethyl-4-piperidyl hexadecanoate, 2,2,6,6-tetramethyl-4-piperidyl octadecanoate, and the like.

[0048] Examples of ultraviolet absorbers include 2-hydroxybenzophenones such as 2,4-dihydroxybenzophenone and 5,5′-methylenebis(2-hydroxy-4-methoxybenzophenone);2-(2-hydroxy-5-methylphenyl)benzotriazole, 2-(2-hydroxy-5-tert-octylphenyl)benzotriazole, 2-(2-hydroxy-3,5-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2-hydroxy-3-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole, 2-(2-hydroxy-3,5-dicumylphenyl)benzotriazole, 2,2'-methylenebis(4-tert-octyl-6-benzotriazole) 2-[2-hydroxy-3-(2-methacryloyloxyethyl)-5-octylphenyl]benzotriazole, 2-[2-hydroxy-3-(2-hydroxyphenyl)-5-tert-butylphenyl]benzotriazole, 2-[2-hydroxy-3-(2-methacryloyloxyethyl)-5-tert-octylphenyl]benzotriazole, 2-[2-hydroxy-3-(2-methacryloyloxyethyl)-5-tert-octylphenyl]benzotriazole, 2-[2-hydroxy-3-(2-hydroxyphenyl ... azole, 2-[2-hydroxy-3-(2-methacryloyloxyethyl)-5-tert-butylphenyl]-5-chlorobenzotriazole, 2-[2-hydroxy-5-(2-methacryloyloxyethyl)phenyl]benzotriazole, 2-[2-hydroxy-3-tert-butyl-5-(2-methacryloyloxyethyl)phenyl]benzotriazole, 2-[2-hydroxy-3-tert-amyl-5-(2-methacryloyloxyethyl)phenyl]benzotriazole, 2-[2-hydroxy-3-tert-amyl-5-(2-methacryloyloxyethyl)phenyl]benzotriazole, 2-(2-hydroxyphenyl)benzotriazoles such as 2-[2-hydroxy-3-tert-butyl-5-(3-methacryloyloxypropyl)phenyl]-5-chlorobenzotriazole, 2-[2-hydroxy-4-(2-methacryloyloxymethyl)phenyl]benzotriazole, 2-[2-hydroxy-4-(3-methacryloyloxy-2-hydroxypropyl)phenyl]benzotriazole, and 2-[2-hydroxy-4-(3-methacryloyloxypropyl)phenyl]benzotriazole;Phenyl salicylate, resorcinol monobenzoate, 2,4-di-tert-butylphenyl-3,5-di-tert-butyl-4-hydroxybenzoate, octyl (3,5-di-tert-butyl-4-hydroxy)benzoate, dodecyl (3,5-di-tert-butyl-4-hydroxy)benzoate, tetradecyl (3,5-di-tert-butyl-4-hydroxy)benzoate, hexadecyl (3,5-di-tert-butyl-4-hydroxy)benzoate ) benzoates such as octadecyl (3,5-di-tert-butyl-4-hydroxy) benzoate, behenyl (3,5-di-tert-butyl-4-hydroxy) benzoate; substituted oxanilides such as 2-ethyl-2'-ethoxyoxanilide and 2-ethoxy-4'-dodecyloxanilide; cyanoacrylates such as ethyl-α-cyano-β,β-diphenylacrylate and methyl-2-cyano-3-methyl-3-(p-methoxyphenyl)acrylate; Lates: 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-hexyloxyphenol, 2-(2-hydroxy-4-octoxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, trioctyl-2,2',2"-((1,3,5-triazine-2,4,6-triyl)tris(3-hydroxybenzene-4-,1-diyl)tripropionate), 2-(4,6-diphenyl-1,3,5-triazine-2-yl)-5-hexyloxyphenol, 2-(2-hydroxy-4-octoxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, trioctyl-2,2',2"-((1,3,5-triazine-2,4,6-triyl)tris(3-hydroxybenzene-4-,1-diyl)tripropionate), triazines such as 2,4,6-tris(2-hydroxy-4-hexyloxy-3-methylphenyl)-1,3,5-triazine and 1,12-bis[2-[4-(4,6-diphenyl-1,3,5-triazin-2-yl)-3-hydroxyphenoxy]ethyl]dodecanedioate; various metal salts or metal chelates, particularly nickel and chromium salts or chelates;

[0049] Examples of flame retardants include triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, cresyl diphenyl phosphate, cresyl-2,6-dixylenyl phosphate, resorcinol bis(diphenyl phosphate), (1-methylethylidene)-4,1-phenylenetetraphenyl diphosphate, 1,3-phenylenetetrakis(2,6-dimethylphenyl)phosphate, and products under the trade names "ADEKA STAB FP-500," "ADEKA STAB FP-600," and "ADEKA STAB FP-600" manufactured by ADEKA Corporation. aromatic phosphate esters of "Stab FP-800", phosphonate esters such as divinyl phenylphosphonate, diallyl phenylphosphonate, and 1-butenyl phenylphosphonate, phosphinate esters such as phenyl diphenylphosphinate, methyl diphenylphosphinate, and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide derivatives, phosphazene compounds such as bis(2-allylphenoxy)phosphazene and dicresylphosphazene, melamine phosphate, melamine pyrophosphate, and melamine polyphosphate amine, melam polyphosphate, ammonium polyphosphate, piperazine phosphate, piperazine pyrophosphate, piperazine polyphosphate, phosphorus-containing vinylbenzyl compounds, red phosphorus and other phosphorus-based flame retardants, magnesium hydroxide, aluminum hydroxide and other metal hydroxides, brominated bisphenol A type epoxy resins, brominated phenol novolac type epoxy resins, hexabromobenzene, pentabromotoluene, ethylene bis(pentabromophenyl), ethylene bistetrabromophthalimide, 1,2-dibromo-4-(1,2-dibromoethylene) Examples of suitable flame retardants include brominated flame retardants such as 2,4,6-tris(tribromophenoxy)-1,3,5-triazine, tribromophenylmaleimide, tribromophenyl acrylate, tribromophenyl methacrylate, tetrabromobisphenol A dimethacrylate, pentabromobenzyl acrylate, and brominated styrene. These flame retardants are preferably used in combination with an anti-drip agent such as a fluororesin, or a flame retardant aid such as a polyhydric alcohol or hydrotalcite.

[0050] Examples of lubricants include unsaturated fatty acid amides such as oleic acid amide and erucic acid amide; saturated fatty acid amides such as behenic acid amide and stearic acid amide, butyl stearate, stearyl alcohol, stearic acid monoglyceride, sorbitan monopalmitate, sorbitan monostearate, mannitol, stearic acid, hydrogenated castor oil, stearic acid amide, oleic acid amide, and ethylene bisstearic acid amide.

[0051] Examples of fillers include talc, mica, calcium carbonate, calcium oxide, calcium hydroxide, magnesium carbonate, magnesium hydroxide, magnesium oxide, magnesium sulfate, aluminum hydroxide, barium sulfate, glass powder, glass fiber, clay, dolomite, silica, alumina, potassium titanate whiskers, wollastonite, and fibrous magnesium oxysulfate. The particle size (fiber diameter, fiber length, and aspect ratio for fibrous fillers) can be appropriately selected. Among these fillers, talc is particularly preferred because of its excellent stiffness-imparting effect and easy availability. Furthermore, the filler may be surface-treated as needed.

[0052] Hydrotalcites are known as natural or synthetic compounds and are complex salt compounds composed of magnesium, aluminum, hydroxyl groups, carbonate groups, and optional crystal water. Examples include compounds in which part of the magnesium or aluminum has been replaced with other metals such as alkali metals or zinc, and compounds in which the hydroxyl groups and carbonate groups have been replaced with other anionic groups. Hydrotalcites may be those in which the crystal water has been dehydrated, or may be those coated with a higher fatty acid such as stearic acid, a higher fatty acid metal salt such as an alkali metal salt of oleic acid, an organic sulfonic acid metal salt such as an alkali metal salt of dodecylbenzenesulfonic acid, a higher fatty acid amide, a higher fatty acid ester, or a wax. Hydrotalcites may be natural or synthetic. Examples of methods for synthesizing hydrotalcites include known methods described in JP-B Nos. 46-2280, 50-30039, 51-29129, JP-B No. 3-36839, JP-A Nos. 61-174270, and 5-179052. Hydrotalcites can be used without any restrictions on their crystal structure, crystal particles, etc.

[0053] Examples of the antistatic agent include low molecular weight antistatic agents such as nonionic, anionic, cationic or amphoteric surfactants, and polymeric antistatic agents such as polymeric compounds. Examples of the nonionic surfactant include polyethylene glycol nonionic surfactants such as higher alcohol ethylene oxide adducts, fatty acid ethylene oxide adducts, higher alkylamine ethylene oxide adducts, and polyolefin glycol ethylene oxide adducts; polyhydric alcohol nonionic surfactants such as polyethylene oxide, glycerin fatty acid esters, pentaerythritol fatty acid esters, sorbitol or sorbitan fatty acid esters, polyhydric alcohol alkyl ethers, and alkanolamine fatty amides. Examples of the anionic surfactant include carboxylates such as alkali metal salts of higher fatty acids; sulfates such as higher alcohol sulfates and higher alkyl ether sulfates; sulfonates such as alkylbenzenesulfonates, alkylsulfonates, and paraffin sulfonates; and phosphates such as higher alcohol phosphates. Examples of the cationic surfactant include quaternary ammonium salts such as alkyltrimethylammonium salts. Examples of amphoteric surfactants include amino acid-type amphoteric surfactants such as higher alkylaminopropionates, and betaine-type amphoteric surfactants such as higher alkyldimethylbetaine and higher alkyldihydroxyethylbetaine. Of these, anionic surfactants are preferred, and sulfonates such as alkylbenzenesulfonates, alkylsulfonates, and paraffin sulfonates are particularly preferred.

[0054] Examples of polymeric antistatic agents include ionomers and block polymers having polyethylene glycol as a hydrophilic moiety. Examples of ionomers include the ionomers described in JP 2010-132927 A. Examples of polymers having polyethylene glycol as a hydrophilic moiety include polyether ester amides described in JP 7-10989 A, polymers composed of polyolefin and polyethylene glycol described in U.S. Pat. No. 6,552,131 A, and polymers composed of polyester and polyethylene glycol described in JP 2016-023254 A.

[0055] Fluorescent brightening agents are compounds that enhance the whiteness and blueness of molded articles by absorbing ultraviolet rays from sunlight or artificial light, converting them into violet to blue visible light, and radiating the resulting fluorescent light. Examples of fluorescent brightening agents include benzoxazole-based compounds such as C.I. Fluorescent Brightener 184, coumarin-based compounds such as C.I. Fluorescent Brightener 52, and diaminostilbene disulfonic acid-based compounds such as C.I. Fluorescent Brightener 24, 85, and 71.

[0056] The pigment is not particularly limited, and commercially available pigments can also be used. Specific examples of pigments include Pigment Red 1, 2, 3, 9, 10, 17, 22, 23, 31, 38, 41, 48, 49, 88, 90, 97, 112, 119, 122, 123, 144, 149, 166, 168, 169, 170, 171, 177, 179, 180, 184, 185, 192, 200, 202, 209, 215, 216, 217, 220, 223, 224, 226, 227, 228, 240, 254; Pigment Orange 13, 31, 34, 36, 38, 43, 46, 48, 49, 51, 52, 55, 59, 60, 61, 62, 64, 65, 71; Pigment Yellow 1, 3, 12, 13, 14 , 16, 17, 20, 24, 55, 60, 73, 81, 83, 86, 93, 95, 97, 98, 100, 109, 110, 113, 114, 117, 120, 125, 126, 127, 129, 137, 138, 139, 147, 148, 150, 151, 152, 153, 154, 166, 168, 175, 180, 185; Pigment Green 7, 10, 36; Pigment Blue 15, 15:1, 15:2, 15:3, 15:4, 15:5, 15:6, 22, 24, 29, 56, 60, 61, 62, 64; Pigment Violet 1, 15, 19, 23, 27, 29, 30, 32, 37, 40, 50, etc.

[0057] Examples of dyes include azo dyes, anthraquinone dyes, indigoid dyes, triarylmethane dyes, xanthene dyes, alizarin dyes, acridine dyes, stilbene dyes, thiazole dyes, naphthol dyes, quinoline dyes, nitro dyes, indamine dyes, oxazine dyes, phthalocyanine dyes, and cyanine dyes.

[0058] The nucleating agent according to the present embodiment may be a one-pack composite additive further blended with a granulation aid such as a binder, a wax, a solvent, silica, etc. The nucleating agent according to the present embodiment may also be a masterbatch further containing a polyolefin resin.

[0059] Examples of polyolefin resins contained in the masterbatch include polyethylene resins such as low-density polyethylene, linear low-density polyethylene, high-density polyethylene, cross-linked polyethylene, and ultra-high molecular weight polyethylene; polypropylene resins such as homopolypropylene, random copolymer polypropylene, block copolymer polypropylene, impact copolymer polypropylene, high-impact copolymer polypropylene, and maleic anhydride-modified polypropylene; α-olefin polymers such as polybutene-1, cycloolefin polymer, poly-3-methyl-1-butene, poly-3-methyl-1-pentene, and poly-4-methyl-1-pentene; and α-olefin copolymers such as ethylene-methyl methacrylate copolymer and ethylene-vinyl acetate copolymer. These polyolefin resins may be used alone or in combination of two or more. Furthermore, the polyolefin resins may be alloyed. The molecular weight, degree of polymerization, density, softening point, proportion of solvent-insoluble matter, degree of stereoregularity, presence or absence of catalyst residue, types and blending ratios of raw material monomers, type of catalyst used in polymerization (e.g., Ziegler catalyst, metallocene catalyst, etc.), etc. of the polyolefin resin are not particularly limited and are selected appropriately.

[0060] As the polyolefin resin contained in the masterbatch, a polypropylene resin is particularly preferred.

[0061] When the nucleating agent is a masterbatch containing a polyolefin resin, the content of the polyolefin resin in the masterbatch may be, for example, 90% by mass or less, preferably 80% by mass or less, and more preferably 60% by mass or less, and may be, for example, 20% by mass or more.

[0062] Next, an embodiment of the resin composition of the present invention will be described.

[0063] <Resin Composition> The resin composition according to this embodiment contains a polyolefin resin, (A) an aromatic phosphate metal salt having a structure represented by the general formula (1), and (B) a carboxylate metal salt having a structure represented by the general formula (2). The resin composition according to this embodiment has a total content of the (A) aromatic phosphate metal salt and the (B) carboxylate metal salt of 0.001 to 10 parts by mass per 100 parts by mass of the polyolefin resin.

[0064] The resin composition according to the present embodiment may contain a polyolefin resin and the nucleating agent described above. In this case, the content of the nucleating agent per 100 parts by mass of the polyolefin resin is 0.001 to 10 parts by mass.

[0065] A molded article obtained by molding the resin composition according to this embodiment has excellent mechanical properties.

[0066] The polyolefin resin contained in the resin composition according to the present embodiment may be the same as the polyolefin resin contained in the masterbatch described above. Among these, polypropylene resin is preferred as the polyolefin resin contained in the resin composition. In this case, the molded article obtained by molding the resin composition has excellent mechanical properties and excellent heat resistance.

[0067] As described above, the total content of (A) aromatic phosphate metal salt and (B) carboxylate metal salt, or the content of nucleating agent, per 100 parts by mass of polyolefin-based resin is 0.001 to 10 parts by mass. If the total content of (A) aromatic phosphate metal salt and (B) carboxylate metal salt, or the content of nucleating agent, per 100 parts by mass of polyolefin-based resin is less than 0.001 part by mass, the mechanical properties of the molded article obtained by molding the resin composition will be insufficient. Furthermore, if the total content of (A) aromatic phosphate metal salt and (B) carboxylate metal salt, or the content of nucleating agent, per 100 parts by mass of polyolefin-based resin, exceeds 10 parts by mass, blooming may occur on the surface of the molded article, or the (A) aromatic phosphate metal salt, (B) carboxylate metal salt, or nucleating agent may migrate from the molded article to the outside.

[0068] From the viewpoint of improving the mechanical properties of a molded article obtained by molding the resin composition and sufficiently suppressing the occurrence of blooming from the molded article and the migration of (A) the aromatic phosphate metal salt, (B) the carboxylic acid metal salt, or the nucleating agent, the total content of (A) the aromatic phosphate metal salt and (B) the carboxylic acid metal salt, or the content of the nucleating agent, per 100 parts by mass of the polyolefin-based resin, is more preferably 0.01 to 1 part by mass, and even more preferably 0.02 to 0.2 parts by mass.

[0069] The content of (A) aromatic phosphate metal salt per 100 parts by mass of polyolefin resin is not particularly limited, and may be, for example, 0.0005 to 9.9995 parts by mass, preferably 0.001 to 5 parts by mass, more preferably 0.01 to 1 part by mass, and even more preferably 0.02 to 0.2 parts by mass. The content of (B) carboxylate metal salt per 100 parts by mass of polyolefin resin is also not particularly limited, and may be, for example, 0.0005 to 9.9995 parts by mass, preferably 0.001 to 5 parts by mass, more preferably 0.01 to 1 part by mass, and even more preferably 0.02 to 0.2 parts by mass.

[0070] In the resin composition according to this embodiment, the mass ratio (A) / (B) of the content of the (A) aromatic phosphate metal salt to the content of the (B) carboxylate metal salt may be, for example, 1 / 99 to 99 / 1. Furthermore, the mass ratio (A) / (B) is preferably 1 / 99 to 50 / 50. In this case, excellent impact resistance can be imparted to the molded article. From the viewpoint of obtaining a molded article that has excellent impact resistance and sufficient rigidity, (A) / (B) is more preferably 1 / 99 to 20 / 80, even more preferably 4 / 96 to 20 / 80, and even more preferably 4 / 96 to 16 / 84.

[0071] Furthermore, in the resin composition according to this embodiment, it is also preferable that the mass ratio (A) / (B) is 50 / 50 to 99 / 1. In this case, superior rigidity can be imparted to the molded article. From the viewpoint of imparting superior rigidity to the molded article, (A) / (B) is more preferably 50 / 50 to 96 / 4, even more preferably 50 / 50 to 84 / 16, even more preferably 50 / 50 to 80 / 20, and particularly preferably 60 / 40 to 80 / 20.

[0072] The resin composition according to the present embodiment may further contain (C) a fatty acid metal salt, which improves the dispersibility of (A) the aromatic phosphate metal salt and (B) the carboxylate metal salt, thereby imparting better mechanical properties to the molded article.

[0073] As the fatty acid metal salt (C), the same ones as those listed for the nucleating agent can be used.

[0074] When the resin composition according to the present embodiment contains (C) a fatty acid metal salt, the content of the (C) fatty acid metal salt may be, for example, 10 to 150 parts by mass, preferably 30 to 120 parts by mass, and more preferably 50 to 100 parts by mass, per 100 parts by mass of the total of the content of the (A) aromatic phosphate ester metal salt and the content of the (B) carboxylic acid metal salt.

[0075] Furthermore, when the resin composition according to the present embodiment contains (C) a fatty acid metal salt, the content of (C) a fatty acid metal salt relative to 100 parts by mass of the polyolefin resin is not particularly limited, and may be, for example, 0.001 to 10 parts by mass, more preferably 0.01 to 1 part by mass, and even more preferably 0.02 to 0.2 parts by mass.

[0076] The resin composition according to the present embodiment preferably further contains a filler. In this case, the rigidity of the molded article obtained by molding the resin composition is improved. Examples of the filler include the same fillers as those that may be contained in the nucleating agent. Among these fillers, talc is particularly preferred from the viewpoint of obtaining a molded article with even better rigidity. The content of the filler contained in the resin composition may be, for example, 0.01 to 80 parts by mass, and preferably 1 to 50 parts by mass, per 100 parts by mass of the polyolefin resin.

[0077] The resin composition according to the present embodiment may further contain, as necessary, various additives such as a compound other than (A) the aromatic phosphate metal salt and (B) the carboxylate metal salt, which has the function of promoting crystallization of the polyolefin resin, a phenolic antioxidant, a phosphorus-based antioxidant, a sulfur-based antioxidant, other antioxidants, hindered amine compounds, ultraviolet absorbers, flame retardants, flame retardant aids, lubricants, fillers, hydrotalcites, antistatic agents, fluorescent brighteners, pigments, dyes, etc. Examples of these various additives include the same additives as those that may be contained in the nucleating agent.

[0078] Next, an embodiment of the method for producing the resin composition of the present invention will be described.

[0079] <Method for Producing Resin Composition> The method for producing a resin composition according to this embodiment includes a compounding step of compounding the above-described nucleating agent into a polyolefin resin.

[0080] A molded article obtained by molding the resin composition produced by the production method according to this embodiment has excellent mechanical properties.

[0081] (Preparation Step) In the production method according to this embodiment, first, the above-described polyolefin resin and the above-described nucleating agent are prepared.

[0082] (Blending step) Next, the nucleating agent is blended into the polyolefin resin. The blending method is not particularly limited, and examples thereof include a method in which the polyolefin resin, the nucleating agent, and, if necessary, the various additives described above are added, and then mixed using a mixing device such as a Henschel mixer, a mill roll, a Banbury mixer, or a super mixer. Here, at least one component of the nucleating agent and the various additives described above may be added before or during polymerization of the polyolefin resin monomer or oligomer, and the remaining components may be added to the resulting polymer.

[0083] In addition, the method for producing a resin composition according to the present embodiment may involve blending (A) an aromatic phosphate metal salt, (B) a carboxylate metal salt, and, if necessary, various additives, in an appropriate order with a polyolefin resin. In this case, the preparation step and blending step can be carried out in the same manner as described above in (Preparation step) and (Blending step).

[0084] A resin composition is produced in the above manner. The method for producing a resin composition may further include a melt-kneading step in which the mixture obtained by the above method is melt-kneaded using a melt-kneading device such as a single-screw extruder or a twin-screw extruder. The melt-kneading temperature may be, for example, 160 to 260°C. The method for producing a resin composition may also include a granulation step in which the kneaded product obtained by melt-kneading is granulated. The granulation method is not particularly limited, and examples include methods using a granulating device such as a pelletizer. The shape of the resin composition obtained by granulation is not particularly limited, and may be, for example, pellet-like.

[0085] Next, an embodiment of the molded article of the present invention will be described.

[0086] <Molded Article> The molded article according to this embodiment is obtained by molding the resin composition described above. This molded article has excellent mechanical properties.

[0087] Examples of molded articles according to this embodiment include injection molded articles, fibers, flat yarns, biaxially stretched films, uniaxially stretched films, unstretched films, sheets, thermoforming molded articles, extrusion blow molded articles, injection blow molded articles, injection stretch blow molded articles, profile extrusion molded articles, and rotational molded articles, and more specifically, examples include automobile exterior parts, automobile interior parts, housings, containers, and piping. Examples of automotive exterior parts include bumpers, radiator grilles, front grilles, front panels, fenders, pillars, pillar covers, door mirror stay covers, glass run channels, door mirror housings, lamp housings, wheel covers, spoilers, air spoilers, weather strips, window moldings, belt moldings, sunroofs, front end modules, door modules, back door modules, and outer panels. Examples of automotive interior parts include instrument panels, door trim panels, pillar trims, door trims, pillar garnishes, package trays, rear trays, console boxes, and air conditioning ducts. Examples of housings include housings for home appliances, housings for arcade game machines, housings for home game machines, housings for portable game machines, housings for cameras, and housings for mobile phones. Examples of containers include food containers such as tableware, containers for prepared foods, containers for frozen foods, microwave heat-resistant containers, freezer storage containers, retort containers, cups, and frozen dessert cups; bottle containers such as beverage bottles, infusion bottles, and hollow medical bottles; containers for physicochemical tests such as beakers and measuring cylinders; chemical containers; medical containers; detergent containers; cosmetic containers; perfume containers; and toner containers. Examples of piping include various pipes such as water pipes, gas pipes, infrastructure pipes, factory utility pipes, vehicle fuel delivery pipes, and vehicle air intake pipes; various tubes such as tubes for cosmetic and perfume sprays, medical tubes, and infusion tubes; and various hoses such as water hoses and vehicle air duct hoses.

[0088] The molding method for the molded article according to this embodiment is not particularly limited, and examples thereof include injection molding, extrusion molding, blow molding, rotational molding, vacuum molding, inflation molding, calendar molding, slush molding, dip molding, and thermoforming.

[0089] The present invention will be explained in more detail below by way of examples, but the present invention is not limited to the following examples in any way.

[0090] The polyolefin resin, (A) aromatic phosphate metal salt, (B) carboxylic acid metal salt, and (C) fatty acid metal salt used in this example are as follows.

[0091] <Polyolefin Resin> (PO-1) Homopolypropylene (Melt flow rate at a cylinder temperature of 230°C and a load of 2.16 kg: 8 g / 10 min)

[0092] <(A) Aromatic phosphate metal salts> (A-1) Sodium 2,2'-methylenebis(4,6-di-tert-butylphenyl)phosphate (A-2) Hydroxyaluminum bis[2,2'-methylenebis(4,6-di-tert-butylphenyl)phosphate] (A-3) Lithium 2,2'-methylenebis(4,6-di-tert-butylphenyl)phosphate

[0093] <(B) Carboxylic Acid Metal Salts> (B-1) Disodium N-benzoyl-L-aspartate (B-2) Disodium N-cyclohexylcarbonyl-L-aspartate (B-3) Disodium N-(4-methylbenzoyl)-L-aspartate (B-4) Aluminum hydroxide N-(2,4,6-trimethylbenzoyl)-L-aspartate

[0094] <(C) Fatty acid metal salts> (C-1) Calcium stearate (C-2) Lithium myristate

[0095] <Preparation of Resin Composition> 100 parts by mass of a polyolefin resin was mixed with (A) an aromatic phosphate metal salt, (B) a carboxylate metal salt, and (C) a fatty acid metal salt in the amounts shown in Tables 1 to 5 below, and further mixed with 0.05 parts by mass of a phenolic antioxidant (tetrakis[methylene-3-(3',5'-tert-butyl-4'-hydroxyphenyl)propionate]methane) and 0.1 parts by mass of a phosphorus-based antioxidant (tris(2,4-di-tert-butylphenyl)phosphite). The mixture was then mixed for 1 minute at a rotation speed of 1,000 rpm using a Henschel mixer (FM200, manufactured by Mitsui Mining Co., Ltd.). The resulting mixture was melt-kneaded using a twin-screw extruder (TEX-28V, manufactured by The Japan Steel Works, Ltd.) under processing conditions of a resin temperature of 220°C and a screw speed of 150 rpm, and then granulated to obtain pellets of Examples 1 to 20 and Comparative Examples 1 and 2. The obtained pellets were dried at 80° C. for 8 hours and then used for property evaluation. In the following Tables 1 to 5, the unit of blend amount is parts by mass.

[0096] <Evaluation of Properties> The mechanical properties of the molded articles obtained by molding the pellets of Examples 1 to 20 and Comparative Examples 1 and 2 were evaluated by measuring the flexural modulus and impact strength according to the following procedures.

[0097] (Flexural Modulus) The pellets of Examples 1 to 20 and Comparative Examples 1 and 2 were dried at 80°C for 8 hours and then injection molded using an injection molding machine (manufactured by Toshiba Machine Co., Ltd., EC-220) under conditions of a resin temperature of 230°C and a mold temperature of 40°C to prepare flexural test specimens measuring 80 mm x 10 mm x 4 mm. The test specimens were then left to stand in a thermo-hygrostat chamber at a temperature of 23°C and a humidity of 50% for 48 hours, after which the test specimens were removed from the chamber and the flexural modulus (MPa) of the test specimens was measured using a bending tester (manufactured by Shimadzu Corporation, AG-IS) in accordance with ISO 178. The results are shown in Tables 1 to 5 below.

[0098] (Impact Strength) The pellets of Examples 1 to 20 and Comparative Examples 1 and 2 were dried at 80°C for 8 hours and then molded using an injection molding machine (apparatus: horizontal injection molding machine NEX80, manufactured by Nissei Plastic Industrial Co., Ltd.) under processing conditions of a resin temperature of 230°C and a mold temperature of 40°C to prepare 80mm x 10mm x 4mm test pieces for measuring Charpy impact strength, each having a V-shaped notch in the center. The test pieces were left to stand in a thermo-hygrostat chamber at a temperature of 23°C and a humidity of 60% for 7 days, and then removed from the thermo-hygrostat chamber, and the Charpy impact strength (kJ / m) of the test pieces was measured in accordance with ISO179-1. ２ The results are shown in Tables 1 to 5 below, under the heading "Impact strength (kJ / m ２ ) is shown.

[0099]

[0100]

[0101]

[0102]

[0103]

[0104] From the results shown in Tables 1 to 5 above, the molded articles obtained by molding the pellets of Examples 1 to 20, which used nucleating agents containing (A) an aromatic phosphate metal salt and (B) a carboxylate metal salt having specific structures, had superior rigidity or equivalent rigidity to the molded article obtained by molding the pellets of Comparative Example 2, which contained (A) an aromatic phosphate metal salt but not (B) a carboxylate metal salt, and also had superior impact resistance.

[0105] From the above, it was confirmed that by using a nucleating agent containing (A) an aromatic phosphate metal salt and (B) a carboxylate metal salt having a specific structure, it is possible to impart excellent mechanical properties to a molded article.

Claims

1. (A) a compound represented by the following general formula (1): (In the above general formulas (3) and (4), Y represents a direct bond or an alkylene group having 1 to 4 carbon atoms, and R ６ ~R １５ each independently represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms, and * represents the position at which the nucleating agent is bonded to the carbonyl carbon; and 2. M in the above general formula (2) ２ 2. The nucleating agent of claim 1, wherein is sodium.

3. The nucleating agent according to claim 1, wherein the mass ratio (A) / (B) of the content of the aromatic phosphate metal salt (A) to the content of the carboxylate metal salt (B) is 1 / 99 to 50 / 50.

4. The nucleating agent according to claim 1, wherein the mass ratio (A) / (B) of the content of the aromatic phosphate metal salt (A) to the content of the carboxylate metal salt (B) is 50 / 50 to 99 / 1.

5. The nucleating agent according to claim 4, wherein the mass ratio (A) / (B) of the content of the aromatic phosphate metal salt (A) to the content of the carboxylate metal salt (B) is 50 / 50 to 80 / 20.

6. A polyolefin resin, and (A) a compound represented by the following general formula (1): (In the above general formulas (3) and (4), Y represents a direct bond or an alkylene group having 1 to 4 carbon atoms, and R ６ ~R １５ each independently represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms, and * represents the position at which the metal salt is bonded to the carbonyl carbon; and a carboxylate metal salt having a structure represented by the following formula:

7. The resin composition according to claim 6, wherein said polyolefin resin is a polypropylene resin.

8. A method for producing a resin composition, comprising a compounding step of compounding the nucleating agent according to claim 1 with a polyolefin resin.

9. A molded product obtained by molding the resin composition according to claim 6.