JP2017125108A - Method for producing polyethylene resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a polyethylene resin composition capable of obtaining a molded product which suppresses poor appearance and is excellent in rigidity.SOLUTION: A method for producing an ethylene resin composition includes a step of blending a substance obtained by dissolving a nucleator component in an organic aluminum compound or a mixed solvent of the organic aluminum compound and an organic solvent, in an ethylene polymer obtained by polymerization of an ethylene monomer, before or during polymerization of the ethylene monomer so that the nucleator component is 0.001-0.5 pts.mass with respect to 100 pts.mass of the ethylene polymer to polymerize the ethylene monomer.SELECTED DRAWING: None

Description

  The present invention relates to a method for producing a polyethylene resin composition, and more particularly, to a method for producing a polyethylene resin composition in which a defective appearance is suppressed and a molded article having excellent rigidity is obtained.

  Conventionally, olefin resins are known as lightweight resins with excellent mechanical properties, chemical stability, and processability. Transport materials such as containers and pallets, interior and exterior parts for automobiles, tanks for industrial chemicals and fuels It is used in a wide range of applications in the industrial materials field such as large containers such as drums, liquid washing, shampoo / rinse bottles, edible oil bottles, and household appliance materials.

  In recent years, production rationalization and cost reduction have been promoted, and in the industrial material field, there has been an increasing demand for thin and light weight, and olefin resins are required to have extremely high performance improvement. In order to meet this demand, adoption of high-stereoregular high-performance catalysts and optimization of resin design have been done, but simply using these methods has not resulted in sufficient performance, There has been a demand for industrial materials having higher rigidity. However, for olefin manufacturers, large-scale equipment remodeling and catalyst conversion were not advantageous in terms of profitability from the viewpoint of cost.

  Conventionally, as a composite material development, an attempt has been made to increase the rigidity by adding an inorganic filler such as filler or talc to an olefin resin. For example, in large blow applications, it is performed with structural members such as automobile parts that require heat resistance and rigidity. However, if the amount of the inorganic filler added is increased for the purpose of improving the rigidity, the specific gravity increases, and the original weight reduction purpose cannot be achieved. Therefore, a material having a small increase in specific gravity and improved rigidity has been desired.

  In addition, olefin resin has a slow crystallization rate after molding, so the molding cycle is low, and depending on the progress of crystallization after heat molding, large crystals are formed, and the transparency and strength of the molded product are insufficient. There are drawbacks. These disadvantages are all derived from the crystallinity of the olefin resin, and it is known that these defects can be eliminated if fine crystals can be rapidly generated during the molding process of the olefin resin.

  For this purpose, it is known to add nucleating agents, and conventionally, sodium benzoate, aluminum 4-tert-butylbenzoate, sodium adipate and 2 sodium bicyclo [2.2.1]. Carboxylic acid metal salts such as heptane-2,3-dicarboxylate, sodium bis (4-tert-butylphenyl) phosphate, sodium-2,2′-methylenebis (4,6-di-tert-butylphenyl) phosphate and Acetal skeletons such as phosphate metal salts such as lithium-2,2′-methylenebis (4,6-di-tert-butylphenyl) phosphate, dibenzylidene sorbitol, bis (methylbenzylidene) sorbitol and bis (dimethylbenzylidene) sorbitol For example, a compound having It is disclosed in the literature 1-8.

  The above nucleating agent is added to the olefin resin by mixing an additive containing the olefin resin and the nucleating agent using a Henschel mixer, mill roll, V blender, ribbon blender, kneader blender, Banbury mixer, super mixer, etc. Then, it is put into an extruder and granulated.

Patent Document 9 proposes a method of performing two-stage polymerization by adding aluminum-bis (p-tert-butylbenzoic acid) hydroxy or sodium benzoate as a nucleating agent after the prepolymerization of propylene. Yes.
Furthermore, Patent Document 10 proposes a production method in which a nucleating agent is added to a propylene monomer.

JP-A-58-1736 JP 59-184252 A JP-A-6-340786 JP-A-7-11075 JP 7-48473 A JP-A-8-3364 JP-A-9-118776 JP-A-10-25295 Patent 3044259 JP 2014-095044 A

  However, the method of blending a polyethylene resin and a nucleating agent by melt-kneading requires an additional nucleating agent more than necessary to cope with the problem of poor dispersion of the nucleating agent, which is economically disadvantageous. In addition, there is a problem that the molded product is colored due to the coloring of the nucleating agent itself. On the other hand, the method of adding the nucleating agent before or during the polymerization of the ethylene monomer has a problem that the nucleating agent inhibits the polymerization of the ethylene monomer.

  In addition, the method of blending the nucleating agent during the polymerization of the ethylene monomer has the advantage that the step of blending the nucleating agent by melt kneading such as extrusion after polymerization can be omitted. Problems have been pointed out that the activity is lowered and the polyethylene resin is colored by the interaction of the polymerization catalyst with the metal, and there is a problem that the selection and management of the polymerization conditions become complicated.

  The method described in Patent Document 9 is aimed at uniform dispersion of the nucleating agent and thereby improving the rigidity of the polymer, and is a polymerization method by two-stage polymerization, wherein the nucleating agent is obtained after one-stage polymerization of propylene. It is a method of adding. Patent Document 9 discloses that the nucleating agent can influence the polymerization activity, masking the nucleating agent, and preventing adverse effects on the catalytic activity by masking the nucleating agent. It has not been. In the method described in Patent Document 9, no effect is obtained in the one-step polymerization in which the nucleating agent is brought into direct contact with the polymerization catalyst. Moreover, the nucleating agent described in Patent Document 9 was not dissolved in the organoaluminum compound and the organic solvent, and the polymerization activity was impaired.

  In Patent Document 10, a production method for adding a nucleating agent to a propylene monomer has been proposed, but a method for adding a nucleating agent to an ethylene monomer has not been specifically described.

  Accordingly, an object of the present invention is to provide a method for producing a polyethylene resin composition in which a defective appearance is suppressed and a molded article having excellent rigidity can be obtained.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors polymerized an ethylene monomer using a nucleating agent dissolved in an organic aluminum compound or an organic aluminum compound and an organic solvent, The present inventors have found that the above problems can be solved and have completed the present invention.

  That is, in the method for producing a polyethylene resin composition of the present invention, an ethylene polymer 100 obtained by ethylene monomer polymerization of a nucleating agent component dissolved in an organic aluminum compound or a mixed solvent of an organic aluminum compound and an organic solvent. It is characterized by comprising a step of polymerizing the ethylene monomer by blending before or during the polymerization of the ethylene monomer so that the nucleating agent component is 0.001 to 0.5 part by mass with respect to the mass part. To do.

（式中、Ｒ^１〜Ｒ^４は各々独立して、水素原子、直鎖又は分岐を有してもよい炭素原子数１〜９のアルキル基を表し、Ｒ^５は水素原子又はメチル基を表し、ｍは１又は２を表し、ｍが１の場合、Ｍ^１は水素原子又はアルカリ金属原子を表し、ｍが２の場合、Ｍ^１は、二族元素、Ａｌ（ＯＨ）又はＺｎを表す。） In the method for producing a polyethylene resin composition of the present invention, the nucleating agent is preferably a compound represented by the following general formula (1).

(In the formula, R ^{1 to} R ⁴ each independently represents a hydrogen atom, a linear or branched alkyl group having 1 to 9 carbon atoms, and R ⁵ represents a hydrogen atom or a methyl group. , M represents 1 or 2, when m is 1, M ¹ represents a hydrogen atom or an alkali metal atom, and when m is 2, M ¹ represents a group II element, Al (OH) or Zn. )

  Moreover, in the manufacturing method of the polyethylene resin composition of this invention, it is preferable that the said nucleating agent is an amide compound.

  Moreover, in the manufacturing method of the polyethylene resin composition of this invention, it is preferable that the said organoaluminum compound is a trialkylaluminum.

  Moreover, in the manufacturing method of the polyethylene resin composition of this invention, it is preferable that the said organic solvent is a thing selected from an aliphatic hydrocarbon compound and an aromatic hydrocarbon compound.

  The molded article of the present invention is characterized by being formed by molding a polyethylene resin composition produced by any one of the above-described methods for producing a polyethylene resin composition.

  The method for producing a polyethylene resin composition of the present invention can provide a method for producing a polyethylene resin composition in which a defective appearance is suppressed and a molded article having excellent rigidity can be obtained without reducing polymerization activity. The product can be made lighter and thinner.

  The production method of the polyethylene resin composition of the present invention (hereinafter also referred to as “production method of the present invention”) will be described in detail below.

Examples of the nucleating agent component used in the present invention include an organic aluminum compound or a nucleating agent that dissolves in a mixed solvent of an organic aluminum compound and an organic solvent. Those that do not dissolve may have poor dispersibility in the resin, and the effects of the present invention may not be obtained. About the solubility of a nucleating agent component, it is necessary to confirm beforehand before implementing the manufacturing method of this invention. Whether or not it dissolves can be determined by dissolving a nucleating agent in an organoaluminum compound or an organoaluminum compound and an organic solvent and visually confirming whether a residue is generated.
Moreover, since the nucleating agent which decomposes | disassembles with an organoaluminum compound may color a polymer or may inhibit polymerization activity, it cannot employ | adopt for the manufacturing method of this invention.

（式中、Ｒ^１〜Ｒ^４は各々独立して、水素原子、直鎖又は分岐を有する炭素原子数１〜９のアルキル基を表し、Ｒ^５は水素原子又はメチル基を表し、ｍは１又は２を表し、ｍが１の場合、Ｍ^１は水素原子又はアルカリ金属原子を表し、ｍが２の場合、Ｍ^１は、二族元素、Ａｌ（ＯＨ）又はＺｎを表す。）で表される化合物及びアミド化合物が好ましい。 In the present invention, preferable nucleating agent components include the following general formula (1),

(Wherein R ^{1 to} R ⁴ each independently represents a hydrogen atom, a linear or branched alkyl group having 1 to 9 carbon atoms, R ⁵ represents a hydrogen atom or a methyl group, and m represents 1; Or when m is 1, M ¹ represents a hydrogen atom or an alkali metal atom, and when m is 2, M ¹ represents a group II element, Al (OH) or Zn). And amide compounds are preferred.

Examples of the alkyl group having 1 to 9 carbon atoms represented by R ¹ , R ² , R ³ and R ⁴ in the general formula (1) include, for example, a methyl group, an ethyl group, a propyl group, and an isopropyl group. Butyl group, sec-butyl group, tert-butyl group, isobutyl group, amyl group, isoamyl group, tert-amyl group, hexyl group, cyclohexyl group, heptyl group, isoheptyl group, tert-heptyl group. Among these, those having a methyl group, a tert-butyl group, and a tert-heptyl group are preferable.

Examples of the second group element represented by M ¹ in the general formula (1) include beryllium, magnesium, calcium, strontium, barium, and radium. Among these, elements that are magnesium and calcium are nucleating. Since the nucleating agent effect of the agent component is remarkable, it is preferable.

As a compound represented by the said General formula (1), the compound shown below is mentioned, for example. However, the present invention is not limited by the following compounds.

（式中、Ｒ^６は水素原子、直鎖又は分岐を有する炭素原子数１〜１２のアルキル基、炭素数３〜１２のシクロアルキル基、炭素原子数６〜２０のアリール基を表し、複数あるＲ^６は各々異なるものであってもよい）で表されるカルバメート構造が炭素原子数１〜１０の炭化水素基を介して少なくとも４つ以上連結した構造を有する化合物、
下記一般式（３）、

（式中、Ｘ^１は、直鎖又は分岐を有する炭素原子数１〜５のアルキレン基であり、Ｒ^７〜Ｒ^１０は、各々、独立して、ハロゲン原子、直鎖又は分岐を有する置炭素原子数１〜４のアルキル基、及び直鎖又は分岐を有する炭素原子数１〜４のアルコキシ基よりなる群から選択されるものを表し、ｐ、ｑ、ｒ、ｓは各々独立して、０〜３の整数（ただし、ｐおよびｓは０ではない）を表す）で表される化合物、
下記一般式（４）、

（式中、Ｒ^１１及びＲ^１２は各々独立して、直鎖又は分岐を有する炭素原子数１〜１０のアルキル基、炭素原子数３〜１２のシクロアルキル基、又は炭素原子数６〜２０のアリール基を表し、Ｘ^２及びＸ^３は、各々独立して、単結合手、または、直鎖又は分岐を有する炭素原子数１〜５のアルキレン基を表す。）で表される化合物、
下記一般式（５）、

（式中、Ｒ^１３及びＲ^１４は各々独立して、水素原子、直鎖又は分岐を有する炭素原子数１〜１２のアルキル基、炭素原子数３〜１２のシクロアルキル基、又は、炭素原子数６〜２０のアリール基を表し、Ｘ^４は、直鎖又は分岐を有する炭素原子数１〜１０のアルキレン基、炭素原子数３〜１２のシクロアルキレン基、又は炭素原子数６〜２０のアリーレン基を表す。なお、Ｒ^１３およびＲ^１４が互いに結合して縮合環構造を形成してもよい）で表される化合物、
下記一般式（６）、

（式中、Ｒ^１５は、水素原子、直鎖又は分岐を有する炭素原子数１〜１２のアルキル基、炭素原子数３〜１２のシクロアルキル基、又は、炭素原子数６〜２０のアリール基を表し、Ｘ^５は、直鎖又は分岐を有する炭素原子数１〜１０のアルキレン基、炭素原子数３〜１２のシクロアルキレン基、又は炭素原子数６〜２０のアリーレン基を表す）で表される化合物、
下記一般式（７）、

（式中、Ｒ^１６及びＲ^１７は各々独立して、直鎖又は分岐を有してもよいアルキル基を表す）で表される化合物、脂肪酸アミド化合物等が挙げられる。 Examples of the amide compound include the following general formula (2),

(In the formula, R ⁶ represents a hydrogen atom, a linear or branched alkyl group having 1 to 12 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, or an aryl group having 6 to 20 carbon atoms, and there are a plurality thereof. R ⁶ may be different from each other) a compound having a structure in which at least four or more carbamate structures are linked via a hydrocarbon group having 1 to 10 carbon atoms,
The following general formula (3),

(In the formula, X ¹ represents a linear or branched alkylene group having 1 to 5 carbon atoms, and R ^{7 to} R ¹⁰ each independently represent a halogen atom, a linear or branched carbon atom. It represents what is selected from the group which consists of a C1-C4 alkyl group and a C1-C4 linear or branched alkoxy group, p, q, r, and s are each independently 0 A compound represented by an integer of ˜3 (where p and s are not 0),
The following general formula (4),

(Wherein R ¹¹ and R ¹² are each independently a linear or branched alkyl group having 1 to 10 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, or 6 to 20 carbon atoms. An aryl group, and X ² and X ³ each independently represent a single bond or a linear or branched alkylene group having 1 to 5 carbon atoms.)
The following general formula (5),

(Wherein R ¹³ and R ¹⁴ are each independently a hydrogen atom, a linear or branched alkyl group having 1 to 12 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, or the number of carbon atoms. Represents an aryl group having 6 to 20 and X ⁴ is a linear or branched alkylene group having 1 to 10 carbon atoms, a cycloalkylene group having 3 to 12 carbon atoms, or an arylene group having 6 to 20 carbon atoms. Wherein R ¹³ and R ¹⁴ may combine with each other to form a condensed ring structure),
The following general formula (6),

(In the formula, R ¹⁵ represents a hydrogen atom, a linear or branched alkyl group having 1 to 12 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, or an aryl group having 6 to 20 carbon atoms. X ⁵ represents a linear or branched alkylene group having 1 to 10 carbon atoms, a cycloalkylene group having 3 to 12 carbon atoms, or an arylene group having 6 to 20 carbon atoms). Compound,
The following general formula (7),

(Wherein, R ¹⁶ and R ¹⁷ each independently represents a linear or branched alkyl group), fatty acid amide compounds, and the like.

  The hydrocarbon group having 1 to 10 carbon atoms represents a compound composed of carbon atoms and hydrogen atoms, and the molecular structure thereof includes alkanes, alkenes, cycloalkanes, aromatic hydrocarbons, and the like. This represents a group in which at least four hydrogen atoms of a hydrogen group are substituted with a carbamate structure. The hydrocarbon group may be interrupted by an oxygen atom, a sulfur atom, a carbonyl group, an ester group, an amide group, an imino group or an aryl group, and the hydrogen atom in the hydrocarbon group is substituted with the following substituent. It may be a thing. These interruptions or substitutions may be combined.

Examples of the linear or branched alkyl group having 1 to 12 carbon atoms represented by R ⁶ in the general formula (2) include, for example, methyl group, ethyl group, propyl group, isopropyl group, butyl group, sec -Butyl, tert-butyl, isobutyl, pentyl, isopentyl, tert-pentyl, hexyl, 2-hexyl, 3-hexyl, heptyl, 2-heptyl, 3-heptyl, isoheptyl Group, tert-heptyl group, n-octyl group, isooctyl group, tert-octyl group, nonyl group, isononyl group, decyl group, undecyl group, dodecyl group and the like.
These alkyl groups may be interrupted by an oxygen atom, a sulfur atom, a carbonyl group, an ester group, an amide group, an imino group or the following aryl group, and a hydrogen atom in the alkyl group is substituted with the following substituent. These interruptions or substitutions may be combined.

  Examples of the substituent include a hydroxy group, a halogen atom, an amino group, a nitro group, a cyano group, an alkenyl group, an alkenyloxy group, an alkanoyloxy group, an alkoxycarbonyl group and other chain aliphatic groups, pyrrole, furan, thiophene, and imidazole. Pyridine, pyridazine, pyrimidine, pyrazine, piperidine, morpholine, 2H-pyran, 4H-pyran, phenyl, biphenyl, triphenyl, naphthalene, anthracene, pyrrolidine, pyridine, indoline, indole, isoindole, indazole, purine, quinolidine, quinoline And cycloaliphatic groups such as isoquinoline or cycloalkyl group.

Examples of the cycloalkyl group having 3 to 12 carbon atoms represented by R ⁶ in the general formula (2) include a cyclopropyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, a cyclononyl group, and a cyclodecyl group. A hydrogen atom in a cycloalkyl group is a hydroxy group, a halogen atom, an alkyl group, an alkoxy group, an alkenyl group, an alkenyloxy group, an alkoxyalkyl group, an alkanoyloxy group, an alkoxycarbonyl group, a nitrile group or a cyano group May be substituted.

Examples of the aryl group having 6 to 20 carbon atoms represented by R ⁶ in the general formula (2) include a phenyl group, a 3,4,5-trimethoxyphenyl group, and a 4-tert-butylphenyl group. , Biphenyl group, naphthyl group, methyl naphthyl group, anthracenyl group, phenanthryl group, etc., where the hydrogen atom in the aryl group is a halogen atom, nitro group, cyano group, alkyl group, alkoxy group, alkenyl group, alkenyloxy group , An alkoxyalkyl group, an alkanoyloxy group, or an alkoxycarbonyl group may be substituted.

（式中、Ｒ^１８は、上記一般式（２）中のＲ^６と同じものを表し、ｋは２〜１０の整数を表し、複数あるＲ^１８は各々異なるものであってもよい）で表される化合物、又は、下記一般式（９）、

（式中、Ｒ^１９は、上記一般式（２）中のＲ^６と同じものを表し、複数あるＲ^１９は各々異なるものであってもよい）で表される化合物を好ましく用いることができる。 Of the compounds represented by the general formula (2), the following general formula (8),

(In the formula, R ¹⁸ represents the same as R ⁶ in the general formula (2), k represents an integer of 2 to 10, and a plurality of R ¹⁸ may be different from each other). Or a compound represented by the following general formula (9),

(Wherein, R ¹⁹ represents the same as R ⁶ in the general formula (2), a plurality of R ¹⁹ may also is a in each different) can be preferably used a compound represented by.

Examples of the specific structure of the compound represented by the general formula (2) in the present invention include the following compounds. However, the present invention is not limited to the following compounds.

Examples of the linear or branched alkylene group having 1 to 5 carbon atoms of X ¹ in the general formula (3) include a methylene group, an ethylene group, a propylene group, a butylene group, an isobutylene group, and a pentylene group. In these alkylene groups, —CH ₂ — may be substituted with —O—, —CO—, —COO— or —OCO—. Further, a hydrogen atom in the alkylene group may be substituted with a halogen atom, alkenyl group, alkenyloxy group, alkanoyloxy group, alkoxycarbonyl group, nitro group, cyano group, aryl group or saturated aliphatic ring.

In the general formula (3), R ^{7 to} R ¹⁰ linear or branched alkyl groups having 1 to 4 carbon atoms include methyl, ethyl, propyl, isopropyl, butyl, and tert-butyl. These alkyl groups may be interrupted by an oxygen atom, a sulfur atom, a carbonyl group, an ester group, an amide group, an imino group or the above aryl group, and the hydrogen atom in the alkyl group is It may be substituted with a substituent, and these interruptions or substitutions may be combined.

Examples of the alkoxy group having 1 to 4 carbon atoms of R ^{7 to} R ¹⁰ in the general formula (3) include a methoxy group, an ethoxy group, a propoxy group, an isopropoxy group, and a butoxy group. These alkoxy groups may be interrupted by an oxygen atom, a sulfur atom, a carbonyl group, an ester group, an amide group, an imino group or the above aryl group, and a hydrogen atom in the alkoxy group is substituted with the above substituent. These interruptions or substitutions may be combined.

Examples of the specific structure of the compound represented by the general formula (3) in the present invention include the following compounds. However, the present invention is not limited to the following compounds.

Among the compounds represented by the general formula (3), compounds in which R ⁷ and R ¹⁰ in the general formula (3) are in the ortho position of the benzene ring are preferably used.

  Moreover, the compound whose p and s in the said General formula (3) are 1 and q and r are 2 is used preferably.

Examples of the linear or branched alkyl group having 1 to 10 carbon atoms represented by R ¹¹ or R ¹² in the general formula (4) include, for example, a methyl group, an ethyl group, a propyl group, an isopropyl group, Butyl, sec-butyl, tert-butyl, isobutyl, pentyl, isopentyl, tert-pentyl, hexyl, 2-hexyl, 3-hexyl, heptyl, 2-heptyl, 3- Examples include heptyl group, isoheptyl group, tert-heptyl group, n-octyl group, isooctyl group, tert-octyl group, nonyl group, isononyl group, decyl group, and the like. These alkyl groups are oxygen atom, sulfur atom, carbonyl group. , An ester group, an amide group, an imino group or the above aryl group may be interrupted, and the hydrogen atom in the alkyl group is substituted as described above. In may be substituted, these interruptions or substitutions may be combined.

Examples of the cycloalkyl group having 3 to 12 carbon atoms represented by R ¹¹ or R ¹² in the general formula (4) include the same as R ⁶ in the general formula (2).

Examples of the aryl group having 6 to 20 carbon atoms and represented by R ¹¹ or R ¹² in the general formula (4) include the same as R ⁶ in the general formula (2).

The alkylene group having 1 to 5 carbon atoms which may be linear or branched and represented by X ² or X ³ in the general formula (4) is X in the general formula (3). ^The same thing as ¹ is mentioned.

（式中、Ｒ^２０は、上記一般式（４）中のＲ^１１と同じものを表し、Ｒ^２１は、上記一般式（４）中のＲ^１２と同じものを表し、ｔは、０又は１を表す） Examples of the compound represented by the general formula (4) include the following compounds.

(In the formula, R ²⁰ represents the same as R ¹¹ in the general formula (4), R ²¹ represents the same as R ¹² in the general formula (4), and t is 0 or 1 Represents

Specific examples of the compound represented by the general formula (4) include the following compounds. However, the present invention is not limited to the following compounds.

The linear or branched alkyl group having 1 to 12 carbon atoms represented by R ¹³ and R ¹⁴ in the general formula (5) or R ¹⁵ in the general formula (6) includes the above general formula. (2) the same thing can be mentioned as ^{R 6} in.

Examples of the cycloalkyl group having 3 to 12 carbon atoms represented by R ¹³ and R ¹⁴ in the general formula (5) or R ¹⁵ in the general formula (6) include those in the general formula (2). same as R ⁶ and the like.

The aryl group having 6 to 20 carbon atoms represented by R ¹³ and R ¹⁴ in the general formula (5) or R ¹⁵ in the general formula (6) is R in the general formula (2). ^The same thing as ⁶ is mentioned.

Examples of the linear or branched alkylene group having 1 to 10 carbon atoms represented by X ⁴ and X ⁵ in the general formula (5) or (6) include a methylene group, an ethylene group, a propylene group, and a methyl group. Ethylene group, butylene group, 1-methylpropylene group, 2-methylpropylene group, 1,2-dimethylpropylene group, 1,3-dimethylpropylene group, 1-methylbutylene group, 2-methylbutylene group, 3-methylbutylene Group, 1,3-dimethylbutylene group, pentylene group, hexylene group, heptylene group, octylene group and the like. These alkylene groups may be interrupted by an oxygen atom, a sulfur atom, a carbonyl group, an ester group, an amide group, an imino group or the above aryl group, and the hydrogen atom in the alkylene group is substituted by the above substituent. These interruptions or substitutions may be combined.

Examples of the cycloalkylene group having 3 to 12 carbon atoms represented by X ⁴ and X ⁵ in the general formula (5) or (6) include a 1,2-cyclopropylene group, a 1,3-cycloheptylene group, Examples include trans-1,4-cyclohexylene group. The hydrogen atom in these cycloalkylene groups may be substituted with the above substituents.

Examples of the arylene group having 6 to 20 carbon atoms represented by X ⁴ and X ⁵ in the general formula (5) or (6) include a 1,4-phenylene group, a 1,3-phenylene group, Examples include 1,5-naphthylene group, 2,6-naphthylene group, 2,6-phenalene group, 1,6-phenanthrene group, 2,7-phenanthrene group, 2,6-anthracene group and the like. The hydrogen atom of these arylene groups may be substituted with the above substituent.

Moreover, the general formula (5) R ¹³ and R ¹⁴ or in the case the general formula (6) R ¹⁵ in is an alkyl group, the carbon number of the alkyl group increases, the nucleating agent of the ethylene polymer However, in the present invention, R ¹³ , R ¹⁴ may deteriorate the heat resistance of the compound itself and may decompose and adversely affect the molded product during the molding process of the ethylene polymer. , Or the number of carbon atoms of the alkyl group represented by R ¹⁵ is preferably within the range of 1 to 8, particularly preferably within the range of 1 to 5.

Examples of the specific structure of the compound represented by the general formula (5) in the present invention include the following compounds. However, the present invention is not limited to the following compounds.

Examples of the specific structure of the compound represented by the general formula (6) in the present invention include the following compounds. However, the present invention is not limited to the following compounds.

Examples of the linear or branched alkyl group having 1 to 6 carbon atoms represented by R ¹⁶ and R ¹⁷ in the general formula (7) include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, Examples include isobutyl group, tert-butyl group, pentyl group, isopentyl group, tert-pentyl group, neopentyl group, hexyl group, isohexyl group and the like.

（式中、Ｒ^２２は、一般式（７）中のＲ^１６と同じものを表し、Ｒ^２３は一般式（７）中のＲ^１７と同じものを表す）、

（式中、Ｒ^２４は、一般式（７）中のＲ^１６と同じものを表し、Ｒ^２５は、一般式（７）中のＲ^１７と同じものを表す） In the present invention, among the compounds represented by the general formula (7), the following compounds are preferable.

(Wherein R ²² represents the same as R ¹⁶ in general formula (7), and R ²³ represents the same as R ¹⁷ in general formula (7)),

(In the formula, R ²⁴ represents the same as R ¹⁶ in the general formula (7), and R ²⁵ represents the same as R ¹⁷ in the general formula (7)).

Specific examples of the structure of the compound represented by the general formula (7) in the present invention include the following compounds. However, the present invention is not limited to the following compounds.

  Examples of the fatty acid amide compound include ethylene bisstearamide, ethylene bis (12-hydroxystearamide), stearic acid amide, and the like.

  Examples of other amide compounds other than the amide compound that can be used in the present invention include 1,2,3-propanetricarboxylic acid tricyclohexylamide, 1,2,3-propanetricarboxylic acid tri (2-methylcyclohexyl), and the like. Amide), 1,2,3-propanetricarboxylic acid tri (3-methylcyclohexylamide), 1,2,3-propanetricarboxylic acid tri (4-methylcyclohexylamide), 1,2,3-propanetricarboxylic acid tri ( 2,3-dimethylcyclohexylamide), 1,2,3-propanetricarboxylic acid tri (2-ethylcyclohexylamide), 1,2,3-propanetricarboxylic acid tri (3-ethylcyclohexylamide), 1,2,3 -Propanetricarboxylic acid tri (4-ethylcyclohexyla ), 1,2,3-propanetricarboxylic acid tri (2-n-propylcyclohexylamide), 1,2,3-propanetricarboxylic acid tri (3-n-propylcyclohexylamide), 1,2,3-propane Tricarboxylic acid tri (4-n-propylcyclohexylamide), 1,2,3-propanetricarboxylic acid tri (2-isopropylcyclohexylamide), 1,2,3-propanetricarboxylic acid tri (3-isopropylcyclohexylamide), 1 , 2,3-propanetricarboxylic acid tri (4-isopropylcyclohexylamide), 1,2,3-propanetricarboxylic acid tri (2-n-butylcyclohexylamide), 1,2,3-propanetricarboxylic acid tri (3- n-butylcyclohexylamide), 1,2,3-propant Carboxylic acid tri (4-n-butylcyclohexylamide), 1,2,3-propanetricarboxylic acid tri (2-isobutylcyclohexylamide), 1,2,3-propanetricarboxylic acid tri (3-isobutylcyclohexylamide), 1 , 2,3-propanetricarboxylic acid tri (4-isobutylcyclohexylamide), 1,2,3-propanetricarboxylic acid tri (2-sec-butylcyclohexylamide), 1,2,3-propanetricarboxylic acid tri (3- sec-butylcyclohexylamide), 1,2,3-propanetricarboxylic acid tri (4-sec-butylcyclohexylamide), 1,2,3-propanetricarboxylic acid tri (2-tert-butylcyclohexylamide), 1,2 , 3-propanetricarboxylic acid tri (3-t rt-butylcyclohexylamide), 1,2,3-propanetricarboxylic acid tri (4-tert-butylcyclohexylamide), 1,2,3,4-butanetetracarboxylic acid tetracyclohexylamide, 1,2,3,4 -Butanetetracarboxylic acid tetra (2-methylcyclohexylamide), 1,2,3,4-butanetetracarboxylic acid tetra (3-methylcyclohexylamide), 1,2,3,4-butanetetracarboxylic acid tetra (4 -Methylcyclohexylamide), 1,2,3,4-butanetetracarboxylic acid tetra (2-ethylcyclohexylamide), 1,2,3,4-butanetetracarboxylic acid tetra (3-ethylcyclohexylamide), 1, 2,3,4-butanetetracarboxylic acid tetra (4-ethylcyclohexylamide), 1,2,3,4-butanetetracarboxylic acid tetra (2-n-propylcyclohexylamide), 1,2,3,4-butanetetracarboxylic acid tetra (3-n-propylcyclohexylamide), 1,2, 3,4-butanetetracarboxylic acid tetra (4-n-propylcyclohexylamide), 1,2,3,4-butanetetracarboxylic acid tetra (2-isopropylcyclohexylamide), 1,2,3,4-butanetetra Carboxylic acid tetra (3-isopropylcyclohexylamide), 1,2,3,4-butanetetracarboxylic acid tetra (4-isopropylcyclohexylamide), 1,2,3,4-butanetetracarboxylic acid tetra (2-n- Butylcyclohexylamide), 1,2,3,4-butanetetracarboxylic acid tetra (3-n-butylcyclo) Xylamide), 1,2,3,4-butanetetracarboxylic acid tetra (4-n-butylcyclohexylamide), 1,2,3,4-butanetetracarboxylic acid tetra (2-isobutylcyclohexylamide), 1,2 , 3,4-Butanetetracarboxylic acid tetra (3-isobutylcyclohexylamide), 1,2,3,4-butanetetracarboxylic acid tetra (4-isobutylcyclohexylamide), 1,2,3,4-butanetetracarboxylic Acid tetra (2-sec-butylcyclohexylamide), 1,2,3,4-butanetetracarboxylic acid tetra (3-sec-butylcyclohexylamide), 1,2,3,4-butanetetracarboxylic acid tetra (4 -Sec-butylcyclohexylamide), 1,2,3,4-butanetetracarboxylic acid tetra (2 tert-butylcyclohexylamide), 1,2,3,4-butanetetracarboxylic acid tetra (3-tert-butylcyclohexylamide), 1,2,3,4-butanetetracarboxylic acid tetra (4-tert-butylcyclohexyl) Amide), 1,3,5-benzenetricarboxylic acid tris (benzylamide), 1,3,5-benzenetricarboxylic acid tris (cycloheptylamide), 1,3,5-benzenetricarboxylic acid tris (3-methylcyclohexylamide) ), 1,3,5-benzenetricarboxylic acid tris (3,4-dimethylphenylamide), 1,3,5-benzenetricarboxylic acid tris (cyclododecylamide), 1,3,5-benzenetricarboxylic acid tris (tert -Octylamide), 1,3,5-benzenetricarboxylic acid Acid tris (S (+)-1-cyclohexylethylamide), 1,3,5-benzenetricarboxylic acid tris (R (-)-1-cyclohexylethylamide), 1,3,5-benzenetricarboxylic acid tris (cyclo Octylamide), 1,3,5-benzenetricarboxylic acid tris (2,3-dimethylcyclohexylamide), 1,3,5-benzenetricarboxylic acid tris (cyclooctylamide), 1,3,5-benzenetricarboxylic acid tris (N-butylamide), 1,3,5-benzenetricarboxylic acid tris (1,1,3,3-tetramethylbutyramide), 1,3,5-tris (2,2-dimethylpropionamide) benzene and the like Can be mentioned.

  The range of the use amount of the nucleating agent component is a range in which the improvement of the addition effect is not observed from the amount where the effect is exhibited. The amount used with respect to 100 parts by mass of the ethylene polymer obtained by the production method of the present invention is preferably in the range of 0.001 to 10 parts by mass, more preferably in the range of 0.005 to 3 parts by mass, and 0.01 to 0 A range of 0.5 parts by weight is particularly preferred. When the amount is less than 0.001 part by mass, the effect of the nucleating agent may not be obtained. When the blending of 10 parts by mass or more is molded by the ethylene polymer alone obtained by the production method of the present invention, The effect of addition may not be obtained, which is uneconomical.

  In the production method of the present invention, the nucleating agent component is dissolved in an organoaluminum compound, or in an organoaluminum and an organic solvent, before or during the polymerization of the olefin monomer. For example, it can be added to any of a polymerization system, a catalyst system, and a compounding tube.

  When the nucleating agent component is added before or during the polymerization of the ethylene monomer, it may be a mixture of the nucleating agent component and the organoaluminum compound, and the nucleating agent is dispersed in an organic solvent. In addition, an organoaluminum compound may be added to dissolve the nucleating agent component. Thereby, it is considered that the nucleating agent component is masked by the organoaluminum compound.

  As the organoaluminum compound, for example, alkylaluminum, alkylaluminum hydride and the like can be used, but alkylaluminum is preferable, and trialkylaluminum is particularly preferable, and specifically, trimethylaluminum, triethylaluminum, tri-n. -Propyl aluminum, triisobutyl aluminum, tri-n-hexyl aluminum, tri-n-octyl aluminum and the like. Any of the above organoaluminum compounds can be used as a mixture. Moreover, the aluminoxane obtained by reaction of alkylaluminum or alkylaluminum hydride and water can be used similarly.

  In the production method of the present invention, an organoaluminum compound that can be regenerated by treating a material masked with an organoaluminum compound with a hydrogen-donating compound such as water, alcohol, or acid is preferably used.

  As a mixing ratio of the nucleating agent component and the organoaluminum compound, the molar ratio of aluminum in the nucleating agent component and the organoaluminum compound is preferably 1/1000 to 1 / 0.3. If the nucleating agent component is more than 1 / 0.3, the excess nucleating agent component may adversely affect the polymerization activity of the ethylene monomer. If the nucleating agent component is less than 1/1000, the organoaluminum compound after polymerization. May remain in the ethylene polymer, and the physical properties of the ethylene polymer may deteriorate, or the desired metal may not be polymerized due to the influence of the catalyst metal component.

Examples of the organic solvent include aliphatic and aromatic hydrocarbon compounds. Examples of the aliphatic hydrocarbon compound include saturated hydrocarbon compounds such as n-pentane, n-hexane, n-heptane, n-octane, isooctane and purified kerosene, and cyclic saturated hydrocarbons such as cyclopentane, cyclohexane and cycloheptane. Examples of the aromatic hydrocarbon compound include compounds such as benzene, toluene, ethylbenzene, and xylene. These organic solvents may be used individually by 1 type, and may use 2 or more types together.
Of the above organic solvents, n-hexane or n-heptane is preferably used. The concentration of the organoaluminum compound in the organic solvent is preferably in the range of 0.001 to 0.5 mol / L, particularly preferably 0.01 to 0.1 mol / L.

  The ethylene polymer in the present invention is an ethylene monomer homopolymer, a copolymer of 5 mol% or less α-olefin monomer, or 1 mol% having only carbon, oxygen and hydrogen atoms in the functional group. It may contain a copolymer with the following non-olefin monomer.

  Examples of the α-olefin monomer include propene, 1-butene, 1-hexene, methyl propenoate, ethyl propenoate, 3-methyl-1-butene, 3-methyl-1-pentene, and 4-methyl-1- Examples include pentene, vinylcycloalkane, vinylcycloalkane, and derivatives thereof. Examples of the non-olefin monomer include vinyl acetate, styrene, and derivatives thereof.

  Examples of the polyethylene include high-density polyethylene, low-density polyethylene, ultra-low density polyethylene, linear low-density polyethylene, and ultra-high molecular weight polyethylene, and can be used without particular limitation in the present invention. The production method of the present invention can also be used for a copolymer having polyethylene as a partial structure, such as an ethylene vinyl acetate copolymer.

Preferred density of the ethylene polymer according to the present invention is a 0.890~0.970g / cm ^3, more preferably 0.900~0.940g / cm ^3. The average molecular weight is preferably a weight average molecular weight in the range of 10,000 to 7000000.

  The production method of the present invention includes a step of polymerizing an ethylene monomer by blending a nucleating agent dissolved in an organic aluminum compound or an organic aluminum compound and an organic solvent before or during the polymerization of the ethylene monomer. It has a special feature. The ratio between the ethylene monomer and the nucleating agent component is adjusted so that the nucleating agent component is 0.001 to 0.5 parts by mass with respect to 100 parts by mass of the ethylene polymer obtained by polymerizing the ethylene monomer. Done.

  As a method of adjusting the amount of the nucleating agent component to the above-mentioned blending amount with respect to the ethylene polymer, the polymerization activity when polymerized without adding the nucleating agent component is obtained, and the desired polymer is obtained with respect to the obtained polymer. Add nucleating agent dissolved in organoaluminum compound or organoaluminum compound and organic solvent so that blending amount of nucleating agent component is added, and polymerize under the same conditions as when no nucleating agent component was added. The method can be adopted. Moreover, the apparatus which introduce | transduces the apparatus which adjusts the addition amount of each component into superposition | polymerization equipment, and may adjust and polymerize so that a nucleating agent component may become the said compounding quantity.

  The polymerization of the ethylene monomer can be carried out in an inert gas atmosphere such as nitrogen in the presence of a polymerization catalyst, but may be carried out in the above inert solvent. In addition, an active hydrogen compound, a particulate carrier, an organoaluminum compound, an ion exchange layered compound, and an inorganic silicate may be added as long as polymerization is not inhibited.

  In the present invention, the polymerization catalyst is not particularly limited, and a known polymerization catalyst can be used. For example, a transition metal of Groups 3 to 11 of the periodic table (for example, titanium, zirconium, hafnium, vanadium, Iron, nickel, lead, platinum, yttrium, samarium, etc.), and typical examples include Ziegler catalysts, Ziegler-Natta catalysts composed of titanium-containing solid transition metal components and organometallic components, at least one A metallocene catalyst, a chromium-based catalyst, or the like comprising a transition metal compound of Group 4 to Group 6 of the periodic table having a cyclopentadienyl skeleton and a promoter component can be used.

  In the present invention, the polymerization method of the ethylene monomer is not particularly limited and a known method can be employed. For example, aliphatic hydrocarbons such as butane, pentane, hexane, heptane, isooctane, cyclopentane, cyclohexane, methyl Slurry polymerization, which is polymerization in an inert solvent such as cycloaliphatic alicyclic hydrocarbons, toluene, xylene, ethylbenzene aromatic hydrocarbons, gasoline fractions, hydrogenated diesel fractions, etc. The ethylene monomer can be obtained by a gas phase polymerization method carried out in 1 Polymerization to produce ethylene homopolymer, ethylene and 2 carbon atoms Examples of the polymerization method include a method of producing a copolymer by copolymerizing at least one olefin unit selected from the group consisting of 12 olefin units or a non-olefin monomer, and a batch production method and a continuous production method. Can be adopted without distinction.

  As a polymerization tank used in the polymerization method, a continuous reaction tank in an existing polymerization facility may be used as it is, and the size, shape, material, and the like can be used without any particular limitation on conventional polymerization facilities.

  In the present invention, as long as it does not adversely affect the polymerization, other additives usually used for polyethylene resins can be added as necessary when the ethylene monomer is polymerized. When adding at the time of superposition | polymerization of an ethylene monomer, you may use what mixed and stirred the other additive, the nucleating agent, and the organoaluminum compound. In the reaction by this method, when the by-product compound does not affect the polymer, it can be used as it is. However, when the by-product compound has an adverse effect on the polymer, the compound is removed by distillation under reduced pressure or the like. It is preferable to use it. Moreover, you may mix | blend after superposition | polymerization of ethylene.

  In addition, even when other additives are added directly, there is an adverse effect on the polymerization, but when the influence on the polymerization can be suppressed by masking with an organoaluminum compound, the production of the nucleating agent master batch of the present invention Can be used in the method.

  Examples of the other additives include phenolic antioxidants, phosphorus antioxidants, ultraviolet absorbers, hindered amine compounds, heavy metal deactivators, nucleating agents, flame retardants, metal soaps (aliphatic carboxylate metal) Salt), hydrotalcite, filler, lubricant, antistatic agent, pigment, dye, plasticizer and the like.

Examples of the phenolic antioxidant 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, N, N′-hexane-1,6-diylbis [3 (3,5-di-tert-butyl-4-hydroxyphenyl) propionamide, 2,2′-oxamido-bis [ethyl-3- (3,5-di-tertbutyl-4-hydroxyphenyl) propionate], 2-ethylhexyl-3- (3 ′, 5′-di-tert-butyl-4′-hydroxyphenyl) propionate, 2,2′-ethylenebis (4,6-di-tertbutylphenol), 3,5-bis Polymer of (1,1-dimethylethyl) -4-hydroxy-benzenepropanoic acid and C13-15 alkyl, 2,5-di-tert amylhydroquinone, hindered phenol (trade name AO. OH. 98), 2,2′-methylenebis [6- (1-methylcyclohexyl) -p-cresol], 2-tertbutyl -6- (3-tertbutyl-2-hydroxy-5-methylbenzyl) -4-methylphenyl acrylate, 2- [1- (2-hydroxy-3,5-di-tertpentylphenyl) 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] -dioxaphosphobin, hexamethylenebis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, bis [monoethyl (3,5-di-tert- Butyl-4-hydroxybenzyl) phosphonate calcium salt, 5,7-bis (1,1-dimethylethyl) -3-hydroxy-2 (3H) -benzoph Non-, reaction product of o-xylene, 2,6-di-tert-butyl-4- (4,6-bis (octylthio) -1,3,5-triazin-2-ylamino) phenol, DL- a-tocophenol (vitamin E), 2,6-bis (α-methylbenzyl) -4-methylphenol, bis [3,3-bis- (4′-hydroxy-3′-tert-butyl-phenyl) butane 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-tertbutyl-4-hydroxybenzyl) phosphonate, tridecyl-3,5-di-tert-butyl-4-hydro Cibenzylthioacetate, thiodiethylenebis [(3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 4,4′-thiobis (6-tert-butyl-m-cresol), 2-octylthio- 4,6-di (3,5-di-tertbutyl-4-hydroxyphenoxy) -s-triazine, 2,2′-methylenebis (4-methyl-6-tertbutylphenol), bis [3,3-bis ( 4-hydroxy-3-tertbutylphenyl) butyric 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, Triethylene 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, myris 3 such as til-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid amide, lauryl-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid amide -(3,5-dialkyl-4-hydroxyphenyl) propionic acid derivatives and the like.
The usage-amount of the said phenolic antioxidant is 0.001-10 mass parts with respect to the obtained ethylene polymer, More preferably, it is 0.01-0.5 mass part.

Examples of the phosphorus antioxidant include triphenyl phosphite, diisooctyl phosphite, heptakis (dipropylene glycol) triphosphite, triisodecyl phosphite, diphenylisooctyl phosphite, diisooctylphenyl phosphite, Diphenyl tridecyl phosphite, triisooctyl phosphite, trilauryl phosphite, diphenyl phosphite, tris (dipropylene glycol) phosphite, diisodecyl pentaerythritol diphosphite, dioleyl hydrogen phosphite, trilauryl trithiophosphite, Bis (tridecyl) phosphite, tris (isodecyl) phosphite, tris (tridecyl) phosphite, diphenyldecylphosphite, dinonylpheny Bis (nonylphenyl) phosphite, poly (dipropylene glycol) phenyl phosphite, tetraphenyldipropyl 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-hydroxy-5-methylphenylthio) -5-methyl Phenyl] phosphite, tri (decyl) phosphite, octyldiphenyl phosphite, di (decyl) monophenyl phosphite, distearyl pentaerythritol diphosphite, a mixture of distearyl pentaerythritol and calcium stearate, alkyl ( 10) Bisphenol A phosphite, di (tridecyl) pentaerythritol diphosphite, di (nonylphenyl) pentaerythritol diphosphite, bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite, bis (2 , 6-Di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, bis (2,4,6-tri-tert-butylphenyl) pentaerythritol diphosphite, bis (2,4-dicumylphenyl) ) Pentaerythritol diphosphite, tetraphenyl-tetra (tridecyl) pentaerythritol tetraphosphite, bis (2,4-di-tert-butyl-6-methylphenyl) ethyl phosphite, tetra (tridecyl) isopropylidene dipheno Diphosphite, 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) butanetriphosphite, tetrakis (2,4-di-tert-butylphenyl) biphenylenediphosphonite, 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'-methylene (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] dioxaphosphine Pin-6-yl) oxy] ethyl) amine, 3,9-bis (4-nonylphenoxy) -2,4,8,10-tetraoxa-3,9-diphosphesspiro [5,5] undecane, 2 , 4,6-Tri-tert-butylphenyl-2-butyl-2-ethyl-1,3-propanediol phosphite, poly 4,4′-isopropylidenediphenol C 2-15 alcohol phosphite, and the like.
The preferable usage-amount of phosphorus antioxidant is 0.001-10 mass parts with respect to 100 mass parts of obtained ethylene polymers, More preferably, it is 0.01-0.5 mass part.

Examples of the thioether-based antioxidant include tetrakis [methylene-3- (laurylthio) propionate] methane, bis (methyl-4- [3-n-alkyl (C12 / C14) thiopropionyloxy] 5-tert-butyl. Phenyl) sulfide, ditridecyl-3,3′-thiodipropionate, dilauryl-3,3′-thiodipropionate, dimyristyl-3,3′-thiodipropionate, distearyl-3,3′-thiodipro Pionate, lauryl / stearyl thiodipropionate, 4,4′-thiobis (6-tert-butyl-m-cresol), 2,2′-thiobis (6-tert-butyl-p-cresol), distearyl- Disulfide is mentioned.
The preferable usage-amount of a thioether type | system | group antioxidant is 0.001-10 mass parts with respect to 100 mass parts of obtained ethylene polymers, More preferably, it is 0.01-0.5 mass part.

Examples of the ultraviolet absorber include 2-hydroxybenzophenones such as 2,4-dihydroxybenzophenone and 5,5′-methylenebis (2-hydroxy-4-methoxybenzophenone); 2- (2-hydroxy-5-methyl) Phenyl) 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-benzotriazolylphenol), 2- (2-hydroxy) Polyethylene glycol ester of 3-tert-butyl-5-carboxyphenyl) benzotriazole, 2- [2-hydroxy-3- (2-acryloyloxyethyl) -5-methylphenyl] benzotriazole, 2- [2-hydroxy -3- (2-methacryloyloxyethyl) -5-tert-butylphenyl] benzotriazole, 2- [2-hydroxy-3- (2-methacryloyloxyethyl) -5-tert-octylphenyl] benzotriazole, 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-butyl-5- (3-methacryloyloxypropyl) phenyl] -5-chlorobenzotriazole, 2- [2-hydroxy-4- (2-methacryloyloxymethyl) phenyl] benzotriazole, 2- [ 2- (2-hydroxy) such as 2-hydroxy-4- (3-methacryloyloxy-2-hydroxypropyl) phenyl] benzotriazole, 2- [2-hydroxy-4- (3-methacryloyloxypropyl) phenyl] benzotriazole Phenyl) benzotriazoles 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) Benzoates such as -hydroxy) benzoate, octadecyl (3,5-di-tert-butyl-4-hydroxy) benzoate, behenyl (3,5-di-tert-butyl-4-hydroxy) benzoate; 2-ethyl-2 '-Ethoxyoxanilide, 2-ethoxy-4'-dodecyl Substituted oxanilides such as oxanilide; cyanoacrylates such as ethyl-α-cyano-β, β-diphenyl acrylate, methyl-2-cyano-3-methyl-3- (p-methoxyphenyl) acrylate; various metal salts; Alternatively, metal chelates, particularly nickel, chromium salts, chelates and the like can be mentioned.
The preferable usage-amount of the said ultraviolet absorber is 0.001-5 mass parts with respect to 100 mass parts of obtained ethylene polymers, More preferably, it is 0.005-0.5 mass part.

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-piperidylbenzoate, bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, tetrakis (2,2,6,6-tetramethyl-4-piperidyl) -1,2, 3,4-butanetetracarboxylate, 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-pi Lysyl) -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-triazin-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 tetraaza Dodecane, 1,6,11-tris [2,4-bis (N-butyl-N- (2,2,6,6-tetramethyl-4-piperidyl) amino) -s-triazin-6-yl] amino Undecane, 1,6,11-tris [2,4-bis (N-butyl-N- (1,2,2,6,6-pentamethyl-4-piperidyl) amino) -s-triazin-6-yl] Aminoundecane, bis {4- (1-octyloxy-2,2,6, 6-tetramethyl) piperidyl} decanedionate, bis {4- (2,2,6,6-tetramethyl-1-undecyloxy) piperidyl) carbonate, TINUVIN NOR 371 manufactured by Ciba Specialty Chemicals It is done.
The amount of the hindered amine compound to be used is preferably 0.001 to 5 parts by mass, more preferably 0.005 to 0.5 parts by mass with respect to 100 parts by mass of the ethylene polymer obtained.

Examples of the flame retardant 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, trade name ADEKA STAB FP-500 manufactured by ADEKA Corporation, trade name ADEKA STAB FP-600 manufactured by ADEKA Corporation, ADEKA Co., Ltd. product name Adeka Stub FP-800 and other aromatic phosphates, phenylphosphonic acid divinyl, phenylphosphonic acid diallyl, phenylphosphonic acid (1-butenyl) and other phosphonic acid esters Phosphinic acid esters such as phenyl diphenylphosphinate, methyl diphenylphosphinate, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide derivatives, bis (2-allylphenoxy) phosphazene, dicresyl phosphazene, etc. Phosphazene compounds, melamine phosphate, melamine pyrophosphate, melamine polyphosphate, melam polyphosphate, ammonium polyphosphate, piperazine phosphate, piperazine pyrophosphate, piperazine polyphosphate, phosphorus-containing vinylbenzyl compounds and phosphorus-based flame retardants such as red phosphorus, Metal hydroxide such as magnesium hydroxide and aluminum hydroxide, brominated bisphenol A type epoxy resin, brominated phenol novolac type epoxy resin, hexabromobenzene, pentabromotoluene, ethylene vinyl (Pentabromophenyl), ethylenebistetrabromophthalimide, 1,2-dibromo-4- (1,2-dibromoethyl) cyclohexane, tetrabromocyclooctane, hexabromocyclododecane, bis (tribromophenoxy) ethane, bromination Polyphenylene ether, brominated polystyrene and 2,4,6-tris (tribromophenoxy) -1,3,5-triazine, tribromophenyl maleimide, tribromophenyl acrylate, tribromophenyl methacrylate, tetrabromobisphenol A type dimethacrylate , Pentabromobenzyl acrylate, and brominated flame retardants such as brominated styrene. These flame retardants are preferably used in combination with anti-drip agents such as fluororesins, and flame retardant aids such as polyhydric alcohols and hydrotalcite.
The preferable usage-amount of the said flame retardant is 1-50 mass parts with respect to 100 mass parts of obtained ethylene polymers, More preferably, it is 10-30 mass parts.

The lubricant is added for the purpose of imparting lubricity to the surface of the molded body and enhancing the effect of preventing damage. Examples of the lubricant 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 monopalmititate, Examples include sorbitan monostearate, mannitol, stearic acid, hydrogenated castor oil, stearic acid amide, oleic acid amide, ethylene bis stearic acid amide and the like. These may be used alone or in combination of two or more.
The preferable usage-amount of the said lubricant is 0.01-2 mass parts with respect to 100 mass parts of obtained ethylene polymers, More preferably, it is 0.03-0.5 mass part.

Examples of the filler 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, Examples thereof include dolomite, mica, silica, alumina, potassium titanate whisker, wollastonite, fibrous magnesium oxysulfate, and the like. be able to. Moreover, what was surface-treated as needed can be used for a filler.
The preferable usage-amount of the said filler is 0.01-80 mass parts with respect to 100 mass parts of obtained ethylene polymers, More preferably, it is 1-50 mass parts.

（式中Ｒ^２６は、分岐鎖を有してもよく、ヒドロキシル基及びシクロアルキル基から選ばれる１種以上の置換基を有してもよい炭素原子数１〜３０の脂肪族基を表し、Ｍ^２は、金属原子を表し、ｎは、１〜４の整数であって、Ｍ^２の金属原子の価数と対応する数を表す。）で表される化合物が挙げられる。 Examples of the aliphatic carboxylic acid metal salt include the following general formula (15),

(In the formula, R ²⁶ represents an aliphatic group having 1 to 30 carbon atoms which may have a branched chain and may have one or more substituents selected from a hydroxyl group and a cycloalkyl group; M ² represents a metal atom, and n is an integer of 1 to 4 and represents a number corresponding to the valence of the metal atom of M ² ).

In the general formula (15), R ²⁶ is an aliphatic group having 1 to 30 carbon atoms, may have a hydroxyl group, may have a cycloalkyl group, or may have a branch. Examples of the aliphatic group include hydrocarbon groups such as an alkyl group, an alkenyl group, and an alkyl group into which two or more unsaturated bonds are introduced.
Specific examples of the aliphatic carboxylic acid represented by the general formula (15) include acetic acid, propionic acid, lactic acid, butyric acid, valeric acid, caproic acid, 2-ethylhexanoic acid, enanthic acid, pelargonic acid, caprylic acid, Neodecylic acid, undecylic acid, lauric acid, tridecylic acid, myristic acid, pentadecylic acid, palmitic acid, margaric acid, stearic acid, nonadecylic acid, arachidic acid, behenic acid, lignoceric acid, serotic acid, montanic acid, melicic acid, succinic acid , Lindelic acid, Tuzuic acid, Palmitoleic acid, Myristoleic acid, Petrothelic acid, Oleic acid, Elaidic acid, Vaccenoic acid, Linoleic acid, Linoleic acid, γ-Linolenic acid, Linolenic acid, Ricinoleic acid, Naphthenic acid, Abietic acid , Hydroxyacetic acid, lactic acid, β-hydroxypropionic acid, 2-methyl Examples include ru-β-hydroxypropionic acid, α-hydroxybutyric acid, β-hydroxybutyric acid, γ-hydroxybutyric acid, monomethylolpropionic acid, dimethylolpropionic acid, and 12-hydroxystearic acid.
Among these, those having an aliphatic group having 12 to 22 carbon atoms are preferable because the effect of improving the physical properties of the polyethylene resin is enhanced, and in particular, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid. Saturated or unsaturated fatty acid salts such as 12-hydroxystearic acid and the like are preferable.

In the general formula (15), the metal atom represented by M ² includes alkali metal, magnesium, calcium, strontium, barium, titanium, manganese, iron, zinc, silicon, zirconium, yttrium, barium, hafnium, and the like. It is done. Among these, alkali metals such as sodium, lithium, and potassium are preferable, and sodium and lithium are particularly preferably used because the crystallization temperature of the ethylene polymer is improved.
The amount of the aliphatic carboxylic acid metal salt used is preferably 0.001 to 10 parts by mass, more preferably 0.01 to 5 parts by mass with respect to 100 parts by mass of the obtained ethylene polymer.

ここで、一般式（１６）中、ｘ１及びｘ２はそれぞれ下記式、
０≦ｘ２／ｘ１＜１０，２≦ｘ１＋ｘ２≦２０
で表される条件を満たす数を表し、ｐは０又は正の数を表す。

ここで、一般式（１７）中、Ａ^q-は、ｑ価のアニオンを表し、ｐは０又は正の数を表す。
また、前記ハイドロタルサイト類における炭酸アニオンは、一部を他のアニオンで置換したものでもよい。 The hydrotalcite is a complex salt compound composed of magnesium, aluminum, hydroxyl group, carbonate group and any crystal water known as a natural product or synthetic product, and part of magnesium or aluminum may be alkali metal, zinc, etc. And those obtained by substituting hydroxyl groups and carbonate groups with other anionic groups. Specifically, for example, the hydrotalcite metal represented by the following general formula (16) is used as an alkali metal. Substituted ones are mentioned. In addition, as the Al—Li-based hydrotalcite, a compound represented by the following general formula (17) can also be used.

Here, in the general formula (16), x1 and x2 are respectively the following formulas:
0 ≦ x2 / x1 <10, 2 ≦ x1 + x2 ≦ 20
And p represents 0 or a positive number.

Here, in general formula (17), A ^q− represents a q-valent anion, and p represents 0 or a positive number.
The carbonate anion in the hydrotalcite may be partially substituted with another anion.

  The hydrotalcites may be those obtained by dehydrating crystal water, higher fatty acids such as stearic acid, higher fatty acid metal salts such as alkali metal oleate, and organic sulfonic acids such as alkali metal dodecylbenzenesulfonate. It may be coated with a metal salt, higher fatty acid amide, higher fatty acid ester or wax.

The hydrotalcites may be natural products or synthetic products. As methods for synthesizing the compounds, Japanese Patent Publication No. 46-2280, Japanese Patent Publication No. 50-30039, Japanese Patent Publication No. 51-29129, Japanese Patent Publication No. 3-36839, Japanese Patent Publication No. 61-174270, Known methods described in, for example, Kaihei No. 5-179052. Further, the hydrotalcites can be used without being limited by their crystal structure, crystal particles and the like.
The preferable usage-amount of the said hydrotalcites is 0.001-5 mass parts with respect to 100 mass parts of obtained ethylene polymers, More preferably, it is 0.05-3 mass parts.

Examples of the antistatic agent include cationic antistatic agents such as fatty acid quaternary ammonium ion salts and polyamine quaternary salts; higher alcohol phosphate esters, higher alcohol EO adducts, polyethylene glycol fatty acid esters, anionic type Anionic antistatic agents such as alkyl sulfonates, higher alcohol sulfates, higher alcohol ethylene oxide adduct sulfates, higher alcohol ethylene oxide adduct phosphates; polyhydric alcohol fatty acid esters, polyglycol phosphates, poly Nonionic antistatic agents such as oxyethylene alkyl allyl ether; amphoteric antistatic agents such as amphoteric alkylbetaines such as alkyldimethylaminoacetic acid betaine and imidazoline type amphoteric activators. Such antistatic agents may be used alone, or two or more kinds of antistatic agents may be used in combination.
The preferable usage-amount of the said antistatic agent is 0.01-20 mass parts with respect to 100 mass parts of obtained ethylene polymers, More preferably, it is 3-10 mass parts.

  As the pigment, commercially available pigments can also be used. For example, 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, 56, 60, 61, 62, 64; Pigment violet 1, 19, 23, 27, 29, 30, 32, 37, 40, 50 and the like.

  Examples of the dye include an azo dye, anthraquinone dye, indigoid dye, triarylmethane dye, xanthene dye, alizarin dye, acridine dye, stilbene dye, thiazole dye, naphthol dye, quinoline dye, nitro dye, indamine dye, oxazine dye, phthalocyanine Examples thereof include dyes and dyes such as cyanine dyes, and a plurality of these may be used in combination.

Examples of the filler 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, mica, silica, alumina, potassium titanate whisker, wollastonite, fibrous magnesium oxysulfate and the like are preferable. Among these fillers, those having an average particle diameter (spherical or flat) or an average fiber diameter (needle or fiber) of 5 μm or less are preferable.
The preferable usage-amount of the said filler is 0.01-50 mass parts with respect to 100 mass parts of obtained ethylene polymers, More preferably, it is 1-30 mass parts.

  In addition, the usage-amount shown above shows the final usage-amount of each additive in the molded object which shape | molded the polyethylene resin composition manufactured with the manufacturing method of this invention.

  Since the molded product formed by molding the polyethylene resin composition produced by the method for producing the polyethylene resin composition of the present invention has excellent rigidity, it can be used in various industries such as various products for daily life, automobile parts and household appliance parts. It has practical performance as a molding material for parts and the like, and is particularly suitable as a molding material for interior and exterior parts for automobiles, especially trim parts, pillars, door trims, instrument panels, consoles and the like. That is, the method for producing the polyethylene resin composition of the present invention is suitable as a method for producing a polyethylene resin composition for living materials, a method for producing a polyethylene resin composition for automobile interior and exterior members, and a method for producing a polyethylene resin composition for interior parts. It is.

  EXAMPLES Hereinafter, although a manufacture example, an Example, and a comparative example are given and this invention is demonstrated further more concretely, this invention is not restrict | limited at all by the following examples.

(Preparation of solution of nucleating agent component)
An organic solvent is added to the nucleating agent component in a compounding amount shown in Table 1 in a nitrogen-substituted flask, and the organoaluminum compound is added dropwise with stirring, so that the nucleating agent component is 20 mg / ml. A solution was prepared. Table 1 shows ◯ when the nucleating agent component is dissolved, and x when the nucleating agent component is not dissolved.

化合物１：ヒドロキシ−２，２’−メチレンビス（４，６−ジ−ｔｅｒｔ−ブチルフェニル）ホスフェート
化合物２：３，３’−（メチレンビス（２，６−ジエチル−４，１−フェニレン））ビス（１−（ｏ−トリイル）プロパン−２−オン）

Compound 1: Hydroxy-2,2′-methylenebis (4,6-di-tert-butylphenyl) phosphate Compound 2: 3,3 ′-(methylenebis (2,6-diethyl-4,1-phenylene)) bis ( 1- (o-triyl) propan-2-one)

[Example 1-1, Example 1-2]
A Ziegler catalyst was added to a nitrogen-substituted autoclave so that 600 ml of heptane, 152 mg of triethylaluminum, and a Ziegler catalyst was a heptane slurry of 0.007 mmol in terms of Ti, and nucleation was performed on 100 parts by mass of the obtained ethylene polymer. The solution of the nucleating agent component shown in Table 1 was sequentially added and stirred so that the mixing amount of the agent component was as shown in Table 2. Replace the inside of the autoclave with an ethylene atmosphere, apply a pressure of 1 kgf / cm ² G with hydrogen, raise the temperature to 70 ° C., apply a pressure of 6 kgf / cm ² G with ethylene in the autoclave, and polymerize at 70 ° C. for 1.5 hours. Went. After replacing the system with nitrogen gas, 5 ml of ethanol was added at 40 ° C. to stop the polymerization reaction, and then the solvent was removed under reduced pressure at 50 ° C. Then, the polymer was dried at 40 ° C. in vacuum for 5 hours A polymer was obtained. The polymerization activity of the obtained polymer was 12.0 kg or more per 1 g of the catalyst.
Next, with respect to 100 parts by mass of the obtained polymer, an additive was added and mixed in the blending amount of the additive added at the time of granulation shown in Table 2, and a small laboratory injection molding machine (Compounder 15, manufactured by DSM Xplore, A strand was obtained by melt-kneading at 260 ° C. with an injection molder 12) and pelletized. Also, using the above laboratory small-sized injection molding machine, injection molding was performed under conditions of an injection temperature of 260 ° C. and a mold temperature of 40 ° C., and a bending test piece of 80 mm × 10 mm × 4 mm and a flat plate shape of 50 mm × 50 mm × 1 mm A specimen was obtained.

[Comparative Examples 1-4]
In Example 1 above, the ethylene polymer was polymerized under the same conditions as in Example 1 except that the Ziegler catalyst was not added and the amount of heptane was added so that the total amount of the solution in the auto claim was 600 ml. Obtained.
Additives were added to and mixed with the resulting ethylene polymer in the amount of additives added during granulation shown in Table 2, and were molded in the same manner as in Example 1 to bend 80 mm × 10 mm × 4 mm. A test piece and a flat test piece of 50 mm × 50 mm × 1 mm were obtained.
In addition, when the ethylene monomer was polymerized using the solution of the nucleating agent component of Production Example 3, the polymerization activity was low and an amount of ethylene polymer necessary for molding processing could not be obtained.

(Evaluation)
The following evaluation was performed using the bending test piece obtained by said shaping | molding process, and a flat test piece. These results are shown in Table 2.

(Foging resistance)
The flat test piece obtained above was set in a fogging test apparatus conforming to ISO-6542, and was processed under the test conditions of a heating temperature of 100 ° C., a heating time of 5 hours, and a cooling plate temperature of 20 ° C. The surface of the test piece after the treatment was observed with a microscope at a magnification of 40 times, and the case where there was no abnormality on the surface was evaluated as ◯, and the case where the surface was rough or the additive component appeared on the surface was evaluated as x.

(Flexural modulus)
The obtained bending test piece was allowed to stand for 48 hours or more immediately after injection molding in a thermostatic bath having a bath internal temperature of 23 ° C., and then subjected to ISO 178 with a bending tester (manufactured by Shimadzu Corporation; AG-IS). The flexural modulus (MPa) was measured according to the above.

(appearance)
The obtained flat plate test piece was left after standing for 48 hours or more in a thermostatic bath whose temperature in the bath was 23 ° C. immediately after injection molding, and as a result of visually checking the surface of the test piece, there was no abnormality. The case where ○, a flow mark, a foreign object, etc. were confirmed was evaluated as x.

化合物１：ヒドロキシ−２，２’−メチレンビス（４，６−ジ−ｔｅｒｔ−ブチルフェニル）ホスフェート
化合物２：３，３’−（メチレンビス（２，６−ジエチル−４，１−フェニレン））ビス（１−（ｏ−トリイル）プロパン−２−オン）
化合物３：安息香酸ソジウム塩
化合物４：ソルビトール核剤（Ｍｉｌｌｉｋｅｎ社商品名Ｍｉｌｌａｄ ３９８８）
ＡＯ−１：テトラキス［メチレン−３−（３’，５’−ジ−ｔｅｒｔ−ブチル−４’−ヒドロキシフェニル）プロピオネート］メタン
ＡＯ−２：トリス（２，４−ジ−ｔｅｒｔ−ブチルフェニル）ホスファイト
ＤＨＴ−４Ａ：協和化学工業株式会社製ハイドロタルサイト商品名「ＤＨＴ−４Ａ」
Ｎａ−Ｓｔ：ステアリン酸ソジウム塩

Compound 1: Hydroxy-2,2′-methylenebis (4,6-di-tert-butylphenyl) phosphate Compound 2: 3,3 ′-(methylenebis (2,6-diethyl-4,1-phenylene)) bis ( 1- (o-triyl) propan-2-one)
Compound 3: Sodium benzoate salt Compound 4: Sorbitol nucleating agent (trade name Millad 3988, manufactured by Milliken)
AO-1: Tetrakis [methylene-3- (3 ′, 5′-di-tert-butyl-4′-hydroxyphenyl) propionate] methane AO-2: Tris (2,4-di-tert-butylphenyl) phos Fight DHT-4A: Hydrotalcite product name “DHT-4A” manufactured by Kyowa Chemical Industry Co., Ltd.
Na-St: Sodium stearate

From the comparison results of Comparative Example 2 and Example 1 and Comparative Example 3 and Example 2, when the nucleating agent component is not supplied at the time of polymerization of ethylene and added at the time of granulation, the effect of improving the rigidity of the test piece is poor. An abnormality was found in the appearance of the molded product.
On the other hand, from Examples 1 and 2, the polyethylene resin composition obtained by the production method of the present invention was excellent in the effect of improving rigidity and the appearance of the molded product was also good.
From the above, it has been confirmed that when the method for producing a polyethylene resin composition of the present invention is used, it is possible to reduce the thickness and weight of the molded body.

Claims (6)

  100 mass of an ethylene polymer obtained by polymerizing an ethylene monomer in a method for producing a polyethylene resin composition, in which a nucleating agent component is dissolved in an organic aluminum compound or a mixed solvent of an organic aluminum compound and an organic solvent It has the process of mix | blending before superposition | polymerization of an ethylene monomer so that it may become 0.001-0.5 mass part with respect to a part, and superposing | polymerizing an ethylene monomer so that it may become 0.001-0.5 mass part. A method for producing a polyethylene resin composition. The method for producing a polyethylene resin composition according to claim 1, wherein the nucleating agent is a compound represented by the following general formula (1).

(In the formula, R ^{1 to} R ⁴ each independently represents a hydrogen atom, a linear or branched alkyl group having 1 to 9 carbon atoms, and R ⁵ represents a hydrogen atom or a methyl group. , M represents 1 or 2, when m is 1, M ¹ represents a hydrogen atom or an alkali metal atom, and when m is 2, M ¹ represents a group II element, Al (OH) or Zn. )   The method for producing a polyethylene resin composition according to claim 1, wherein the nucleating agent is an amide compound.   The method for producing a polyethylene resin composition according to any one of claims 1 to 3, wherein the organoaluminum compound is trialkylaluminum.   The method for producing a polyethylene resin composition according to any one of claims 1 to 4, wherein the organic solvent is selected from an aliphatic hydrocarbon compound and an aromatic hydrocarbon compound.   A molded article obtained by molding a polyethylene resin composition produced by the method for producing a polyethylene resin composition according to any one of claims 1 to 5.