JP2003268174A - Polypropylene resin composition and its film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polypropylene resin composition having an excellent color tone and sliding properties, and to provide a film composed of the resin composition. <P>SOLUTION: The polypropylene resin composition comprises (A) 100 pts.wt. polypropylene, (B) 0.001-0.2 pt.wt. inorganic neutralizing agent, (C) 0.01-1.0 pt.wt. phosphorous ester to be represented by formula (I), and (D) 0.001-1.0 pt.wt. fatty acid amide, an the film is composed of the resin composition. Preferably, the polypropylene resin composition comprises at least one kind to be selected from hydrotalcite, and an oxide or hydroxide of an alkaline earth metal as the inorganic neutralizing agent, an the film is composed of the resin composition. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a polypropylene resin composition and a film comprising the resin composition. More specifically, the present invention relates to a polypropylene resin composition excellent in color tone and slipperiness and a film made of the resin composition.

[0002]

2. Description of the Related Art Polypropylene is widely used in various fields such as food and fiber packaging materials, containers, medical applications, home appliances, and automobile interior and exterior products. Generally, a polyolefin resin is blended with a hindered phenol-based antioxidant or a phosphorus-based antioxidant in order to prevent deterioration of the resin that occurs during heat-melt kneading or molding. Further, especially for packaging purposes, a lubricant such as fatty acid amide is blended in order to improve the opening of the packaging bag.

When the above-mentioned hindered phenol-based antioxidant or phosphorus-based antioxidant is used, a polyolefin resin or a product made of the resin is a waste gas of an automobile or a heating appliance such as an oil stove. It may be discolored by NOx gas contained in the waste gas. Further, when a lubricant such as a fatty acid amide is mixed, discoloration due to NOx gas may become noticeable.

As a method for preventing such discoloration due to NOx gas, for example, Japanese Patent Laid-Open No. 10-273494 describes a method of blending a specific phosphite ester with a thermoplastic resin. However, when a lubricant such as a fatty acid amide is added, further improvement in the resistance to discoloration against NOx gas has been desired.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a polypropylene resin composition excellent in color tone and slipperiness, and a film comprising the resin composition.

[0006]

As a result of intensive studies, the present inventors have found that the present invention can solve the above problems, and have completed the present invention. That is, the present invention is based on 100 parts by weight of polypropylene (A), 0.001 to 0.2 parts by weight of an inorganic neutralizing agent (B), and a phosphite ester (C) represented by the following general formula (I). ) A polypropylene resin composition containing 0.01 to 1.0 part by weight and 0.001 to 1.0 part by weight of a fatty acid amide (D), and a film comprising the resin composition. (In the formula, R ¹ , R ² , R ⁴ and R ⁵ are each independently a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or 5 to 8 carbon atoms.
Represents a cycloalkyl group having 6 to 12 carbon atoms, an aralkyl group having 7 to 12 carbon atoms or a phenyl group, and R ³ represents a hydrogen atom or a carbon atom having 1 carbon atom.
~ 8 represents an alkyl group. X is a sulfur atom or -CH
R ⁶ — group (R ⁶ represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms or a cycloalkyl group having 5 to 8 carbon atoms),
n is 0 or 1. A represents an alkylene group having 2 to 8 carbon atoms or a * -CO (R ⁷ ) m-group (R ⁷ represents an alkylene group having 1 to 8 carbon atoms, * represents a bonding site with an oxygen atom, m Represents 0 or 1.). One of Y and Z has a hydroxyl group and has 1 to 8 carbon atoms.
Represents an alkoxy group or an aralkyloxy group having 7 to 12 carbon atoms, and the other represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms. ) Hereinafter, the present invention will be described in detail.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Polyprolene (A) used in the present invention is a polymer or copolymer obtained by polymerizing a monomer mainly composed of propylene, for example, a homopolymer of propylene, propylene- Ethylene random copolymer, propylene-α-olefin random copolymer, propylene-ethylene-α-olefin terpolymer, a polymer component obtained by polymerizing a monomer mainly composed of propylene, propylene, ethylene and / Alternatively, a polypropylene-based copolymer (propylene-ethylene block copolymer) obtained by producing a copolymer component obtained by polymerizing a monomer composed of an α-olefin having 4 to 12 carbon atoms in at least two or more stages May be referred to as coalescence.) And the like. Preferred are propylene homopolymers, propylene-ethylene random copolymers, propylene-α-olefin random copolymers, and propylene-ethylene-α-olefin terpolymers. These may be used alone or in combination of two or more.

The α-olefin has 4 to 4 carbon atoms.
12 α-olefins may be mentioned, for example, 1-butene, 2-methyl-1-propene, 1-pentene, 2-methyl-1-butene, 3-methyl-1-butene, 1-hexene, 2-ethyl. -1-butene, 2,3-dimethyl-1
-Butene, 2-methyl-1-pentene, 3-methyl-1
-Pentene, 4-methyl-1-pentene, 3,3-dimethyl-1-butene, 1-heptene, methyl-1-hexene, dimethyl-1-pentene, ethyl-1-pentene,
Trimethyl-1-butene, methylethyl-1-butene,
1-octene, methyl-1-pentene, ethyl-1-hexene, dimethyl-1-hexene, propyl-1-heptene, methylethyl-1-heptene, trimethyl-1-
Penten, propyl-1-pentene, diethyl-1-
Butene, 1-nonene, 1-decene, 1-undecene, 1
-Examples include dodecene. Preferably 1-butene,
1-pentene, 1-hexene, 1-octene, and more preferably 1 from the viewpoint of copolymerization characteristics, economic efficiency, and the like.
-Butene, 1-hexene.

The content of ethylene and / or α-olefin having 4 to 12 carbon atoms in the copolymer is usually 0.
It is 1 to 20% by weight, preferably 1 to 10% by weight.

Polypropylene (A) used in the present invention
The production method of is carried out by a known polymerization method using a known catalyst. As the known catalyst, for example, a Ti-Mg-based catalyst comprising a solid catalyst component obtained by complexing a Ti compound with a magnesium compound, and the like,
Examples of the catalyst system include a combination of an organoaluminum compound and, if necessary, a third component such as an electron donating compound, and a metallocene catalyst. Magnesium is preferable,
A solid catalyst component containing titanium and halogen as essential components,
A catalyst system comprising an organoaluminum compound and an electron-donating compound, for example, JP-A-61-218606, JP-A-61-287904, and JP-A-7-21.
This is a catalyst system described in Japanese Patent No. 6017.

Known polymerization methods include, for example, a slurry polymerization method using an inert hydrocarbon solvent, a solvent polymerization method, a liquid phase polymerization method without a solvent, a gas phase polymerization method, or a liquid phase-gas method in which these are continuously performed. A phase polymerization method and the like can be mentioned, and a gas phase polymerization method is preferable.

In the production of polypropylene used in the present invention, if necessary, residual solvent of polypropylene,
In order to remove ultra-low molecular weight oligomers and the like that are by-produced during production, drying may be performed at a temperature below the melting temperature of polypropylene. For example, examples of the drying method include the methods described in JP-A-55-75410 and JP-A-2565753.

23 of polypropylene used in the present invention
The melt flow rate (MFR) measured at 0 ° C. is preferably 0.1 to 50 from the viewpoint of fluidity or film forming property.
g / 10 minutes, more preferably 1 to 20 g / 10 minutes.

Examples of the inorganic neutralizing agent (B) used in the present invention include hydrotalcite, alkaline earth metal oxides or hydroxides, and the like. These neutralizing agents may be used alone or in combination of at least two kinds.

Hydrotalcite means the following general formula (I
It is an anion-exchange layered compound represented by I).   [M²⁺ _1-XM³⁺ _X(OH)₂]^{X +}[A^n- _{X / n}・ MH₂O]^X-    Formula (II) [M²⁺ _1-XM³⁺ _X(OH)₂]^{X +}Is the basic layer, and [A^n-
_{X / n}・ MH₂O]^X-Is the middle layer. M²⁺Is Mg²⁺, M
n²⁺, Fe²⁺, Co²⁺, Ni²⁺, Cu²⁺, Zn ²⁺Etc. 2
Is a valent metal cation, M³⁺Is Al³⁺, Fe³⁺, Cr
³⁺, Co³⁺, In³⁺And other trivalent metal cations. A^n-
Is OH^-, F^-, Cl^-, Br^-, NO^3-, CO₃ ^2-, S
O_Four ^2-, Fe (CN)₆ ^3-, CH₃COO^-Io oxalate
N is an n-valent anion such as salicylate ion,
Is a positive integer. X is 0 <X ≦ 0.33, and m
Is a positive number. The above hydrotalcite is a natural mineral
Or a synthetic product, and its crystal structure
It can be used regardless of structure, crystal particle size, water content, surface treatment, etc.
You can

Among the hydrotalcites represented by the above general formula, hydrotalcites represented by the following formula (III) are preferable. _{Mg Y Al 2 (OH) 2Y} + 4 CO 3 · mH 2 O Formula (III) (wherein, Y is Y ≧ 4, m is a positive number.)

More preferably, M ^{2+ of the} general formula (III)
Is composed of any one of Mg ²⁺ and Zn ²⁺ , or two kinds of divalent metal cations, and the following hydrotalcites are particularly preferable. Mg _4.5 Al ₂ (OH) ₁₃ CO ₃ / 3H ₂ O Mg _4.5 Al ₂ (OH) ₁₃ (CO ₃ ) _0.8 · O _0.2 Mg ₄ Al ₂ (OH) ₁₂ CO ₃ / 3H ₂ O Mg ₅ Al ₂ (OH ) ₁₄ CO ₃ .4H ₂ O Mg ₆ Al ₂ (OH) ₁₆ CO ₃ .4H ₂ O (natural mineral) Zn ₄ Al ₂ (OH) ₁₂ CO ₃ .mH ₂ O (m is 0 to 4) Mg ₃ ZnAl ₂ (OH) ₁₂ CO ₃ · mH ₂ O (m is 0 to
4)

The oxide or hydroxide of an alkaline earth metal is an oxide or hydroxide of a metal atom of Group II of the periodic table, such as calcium oxide, magnesium oxide,
Examples thereof include calcium hydroxide and magnesium hydroxide. Preferred is calcium hydroxide.

The inorganic neutralizing agent (B) used in the present invention is
A powdery one is preferably used because it has excellent dispersibility. The average particle diameter is preferably 50 μm or less, more preferably 10 μm or less, and further preferably 5 μm or less.

The blending amount of the inorganic neutralizing agent (B) used in the present invention is 100 parts by weight of polypropylene (A).
It is 0.001 to 0.2 part by weight. This is 0.0
01 to 0.1 parts by weight, more preferably 0.005
~ 0.05 parts by weight. If the blending amount is less than 0.001 part by weight, inactivation of the catalyst residue may be insufficient and the processing machine may be corroded, and if it exceeds 0.2 part by weight, deterioration of discoloration and stabilization of the stabilizer may occur. Decomposition may occur, and the effects of the present invention may be saturated, which is not economical.

The phosphite ester (C) used in the present invention is a phosphite ester represented by the following general formula (I). (In the formula, R ¹ , R ² , R ⁴ and R ⁵ are each independently a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or 5 to 8 carbon atoms.
Represents a cycloalkyl group having 6 to 12 carbon atoms, an aralkyl group having 7 to 12 carbon atoms or a phenyl group, and R ³ represents a hydrogen atom or a carbon atom having 1 carbon atom.
~ 8 represents an alkyl group. X is a sulfur atom or -CH
R ⁶ — group (R ⁶ represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms or a cycloalkyl group having 5 to 8 carbon atoms),
n is 0 or 1. A represents an alkylene group having 2 to 8 carbon atoms or a * -CO (R ⁷ ) m-group (R ⁷ represents an alkylene group having 1 to 8 carbon atoms, * represents a bonding site with an oxygen atom, m Represents 0 or 1.). One of Y and Z represents a hydroxyl group, an alkoxy group having 1 to 8 carbon atoms or an aralkyloxy group having 7 to 12 carbon atoms, and the other represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms. . )

In the phosphite ester (C) represented by the general formula (I), the substituents R ¹ , R ² , R ⁴ and R ⁵ are each independently a hydrogen atom or an alkyl group having 1 to 8 carbon atoms. Base,
Cycloalkyl group having 5 to 8 carbon atoms, 6 to 6 carbon atoms
12 alkylcycloalkyl groups, 7 to 12 carbon atoms
Represents an aralkyl group or a phenyl group.

Here, as typical examples of the alkyl group having 1 to 8 carbon atoms, for example, methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, sec- Examples thereof include a butyl group, a t-butyl group, a t-pentyl group, an i-octyl group, a t-octyl group, and a 2-ethylhexyl group. Typical examples of the cycloalkyl group having 5 to 8 carbon atoms include, for example, cyclopentyl. Group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, and the like, and typical examples of the alkylcycloalkyl group having 6 to 12 carbon atoms include, for example, 1-methylcyclopentyl group, 1-methylcyclohexyl group, and 1-methyl. -4
Examples of the aralkyl group having 7 to 12 carbon atoms include benzyl group, α-methylbenzyl group, α, α-dimethylbenzyl group, and the like.

R ¹ , R ² and R ⁴ are preferably an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, and an alkylcycloalkyl group having 6 to 12 carbon atoms. Among them, R ¹ and R ⁴ are more preferably a t-alkyl group such as a t-butyl group, a t-pentyl group and a t-octyl group, a cyclohexyl group and a 1-methylcyclohexyl group.

R ² is more preferably a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a sec-butyl group, a t-butyl group,
An alkyl group having 1 to 5 carbon atoms such as a t-pentyl group is more preferable, and a methyl group, a t-butyl group and a t-pentyl group are more preferable.

R ⁵ is preferably a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or a cycloalkyl group having 5 to 8 carbon atoms, more preferably a hydrogen atom, a methyl group,
It is an alkyl group having 1 to 5 carbon atoms such as ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, sec-butyl group, t-butyl group, t-pentyl group. .

The substituent R ³ is a hydrogen atom or a carbon atom of 1
The alkyl group having 1 to 8 carbon atoms is exemplified by the alkyl group having 1 to 8 carbon atoms. A hydrogen atom or an alkyl group having 1 to 5 carbon atoms is preferable, and a hydrogen atom or a methyl group is more preferable.

When n is 0, the substituent X represents that two groups having two phenoxy group skeletons are directly bonded, and when n is 1, the sulfur atom or the number of carbon atoms is 1.
Represents a methylene group which may be substituted with an alkyl group having 8 to 8 or a cycloalkyl group having 5 to 8 carbon atoms.
Here, as the alkyl group having 1 to 8 carbon atoms and the cycloalkyl group having 5 to 8 carbon atoms, which are substituted with the methylene group, the same alkyl group and cycloalkyl group as those described above can be mentioned. As the substituent X, n is preferably 0
And a group having two phenoxy group skeletons are directly bonded, or n is 1 and a methylene group, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, or an n-butyl group. , I-butyl group, t-butyl group and the like are substituted methylene groups.

The substituent A is an alkylene group having 2 to 8 carbon atoms or a * -CO (R ⁷ ) m-group (R ⁷ is 1 to 8 carbon atoms).
In the alkylene group of 8, * indicates a binding site with an oxygen atom, and m is 0 or 1. ) Represents.

Here, as typical examples of the alkylene group having 2 to 8 carbon atoms, for example, ethylene group, propylene group,
Examples thereof include a butylene group, a pentamethylene group, a hexamethylene group, an octamethylene group, a 2,2-dimethyl-1,3-propylene group and the like, and a propylene group is preferable. In addition, * in the * -COR ⁷ -group indicates that the carbonyl group is a portion bonded to the oxygen atom of the phosphite group. Typical examples of the alkylene group having 1 to 8 carbon atoms in R ⁷ include, for example, methylene group, ethylene group, propylene group, butylene group, pentamethylene group, hexamethylene group, octamethylene group, 2,2-dimethyl- 1,3
-A propylene group etc. are mentioned. * -CO (R ⁷ ) m-
The group is preferably a * -CO- group in which m is 0, or * -CO in which m is 1 and R ⁷ is ethylene.
(CH ₂ CH ₂₎ - a group.

One of Y and Z has a hydroxyl group, an alkoxy group having 1 to 8 carbon atoms, or a carbon atom having 7 to 12 carbon atoms.
Represents an aralkyloxy group, and the other represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms.

Here, examples of the alkyl group having 1 to 8 carbon atoms include the same alkyl groups as described above, and examples of the alkoxy group having 1 to 8 carbon atoms include, for example, an alkyl portion having 1 to 8 carbon atoms as described above. Examples of the aralkyloxy group having a carbon number of 7 to 12 include aralkyloxy groups having the same alkyl as the alkyl of 7 to 12. Further, examples of the aralkyloxy group having a carbon number of 7 to 12 include an aralkyloxy group having an aralkyl moiety similar to the aralkyl having the carbon number of 7 to 12 described above. .

The amount of the phosphite ester (C) used in the present invention is 0.01 to 1.0 part by weight based on 100 parts by weight of polypropylene (A). It is preferably 0.01 to 0.5 part by weight, more preferably 0.
It is from 05 parts by weight to 0.3 parts by weight. If the amount of the phosphite ester (C) is less than 0.01 part by weight, the processing stability may be insufficient, and if it exceeds 1.0 part by weight, the hue may deteriorate.

Fatty acid amides (D) used in the present invention
A known material can be used for. The fatty acid amides, preferably amides of higher fatty acids, more preferably the general formula R ⁸ -CONH ₂ (R ⁸ in the formula represents a saturated or unsaturated hydrocarbon group having 12 to 24 carbon atoms. _{^{), R 9 -CONH- (CH 2}} ) l -NHCO-R 10
(R ⁹ and R ¹⁰ in the formula each independently have 12 to 12 carbon atoms.
Represents 24 saturated or unsaturated hydrocarbon groups, and l is 0 to 1
Represents an integer of 0. ) Is a fatty acid amide represented by.
For example, the general formula R ⁸ —CONH ₂ (wherein R ⁸ represents a saturated or unsaturated hydrocarbon group having 12 to 24 carbon atoms).
The fatty acid amides represented by are lauric acid amides,
Myristic acid amide, palmitic acid amide, stearic acid amide, arachidic acid amide, behenic acid amide, an erucic acid _{^{amide, R 9 -CONH- (CH 2)}} l -
NHCO-R ¹⁰ (R ⁹ in the formula, R ¹⁰ represents a saturated or unsaturated hydrocarbon group having a carbon number of 12 to 24 independently, l represents. An integer of 0) fatty acid represented by Examples of the amides include methylenebisbehenic acid amide, methylenebisstearic acid amide, methylenebisoleic acid amide, ethylenebisstearic acid amide, hexamethylenebisstearic acid amide, and hexamethylenebisoleic acid amide.

Fatty acid amides (D) used in the present invention
The blending amount of polypropylene (A) is 0.001 to 1.0
Parts by weight, and preferably 0.01 to 1.0 parts by weight. If it is less than 0.001 part by weight, the slipperiness of the film may be insufficient, and if it exceeds 1.0 part by weight, the film may be whitened.

If necessary, other additives and other resins may be added to the polypropylene resin composition used in the present invention. Examples of other additives include antioxidants, ultraviolet absorbers, antistatic agents, lubricants, nucleating agents, adhesives, antifogging agents, antiblocking agents, and the like.

Other resins include various olefin resins such as polyethylene and polybutene, ethylene and α-
Examples thereof include olefin copolymer elastomers, which may be produced by a heterogeneous catalyst or a homogeneous catalyst represented by a metallocene catalyst. Further, styrene-butadiene-styrene copolymer and styrene-copolymer rubber obtained by hydrogenating a styrene-isoprene-styrene copolymer, and other elastomers are also included.

As the method for producing the polypropylene resin composition of the present invention, known methods can be mentioned so as to obtain a homogeneous composition. For example, polypropylene, an inorganic neutralizing agent, phosphite ester, a method of blending by heating and melt mixing fatty acid amides, polypropylene, inorganic neutralizing agent, phosphite esters, fatty acid amides, if necessary, Examples thereof include a method of blending other additives and / or other resins and heating and melting and mixing.

As a compounding method, for example, a method of directly compounding polypropylene powder and various additives by using a mixing device such as a Henschel mixer, a polypropylene additive masterbatch having a high additive concentration, And a method of adding additives to polypropylene in a liquid state by melting additives. Then, other additives to be blended as required may be blended at the same time as the phosphite ester (I), or may be blended separately.

As the apparatus used for heating and melting and mixing, a known apparatus is used, and preferably an extruder, Banbury mixer, batch type kneader or the like is used. The hot melt mixing is preferably performed in the presence of an inert gas such as nitrogen or argon, and the temperature of the hot melt mixing is lower than 300 ° C, preferably 180 ° C to 250 ° C.

The film of the present invention may be either a single layer film made of the polypropylene resin composition of the present invention or a laminated film containing a layer made of the polypropylene resin composition of the present invention. As a method for producing the film of the present invention, a method of film-forming the polypropylene-based resin composition of the present invention alone using a commonly used inflation method, T-die method, calendar method, or the like, or the polypropylene-based composition of the present invention Examples thereof include a method of forming a film as at least one layer of a multilayer film obtained by using a resin composition and different resins. Examples of the method for producing the multilayer film include an extrusion laminating method, a thermal laminating method, a dry laminating method and the like which are commonly used. Also,
Examples of the method for producing a film by stretching a film or sheet obtained by molding in advance, as the stretching method, for example, roll stretching method, tenter stretching method, tubular stretching method or the like uniaxially or biaxially. A stretching method may be used. The thickness of the film of the present invention is preferably 10
To 500 μm, more preferably 10 to 150 μm
Is.

The film of the present invention can be used for foods,
Examples thereof include packaging bags for fibers, sundries, confectioneries, films for packaging liquid foods, packaging materials for retort foods, and the like.

[0043]

The present invention will be specifically described below with reference to examples and comparative examples, but the scope of the present invention is not limited to the examples. The methods for preparing the samples used in the examples and comparative examples and the methods for measuring the physical properties are shown below. (1) Preparation of sheet Using a hot press molding machine, a sample (pellet) is heated to 230 ° C.
Then, it was heated and melted under a pressure of 50 kg / cm ² for 10 minutes and then cooled and solidified at 30 ° C. for 5 minutes to prepare a sheet having a thickness of 3 mm.

(2) NO _X Gas Exposure Test In a 3 L hermetically closed cylindrical glass container, the sheet was attached to the upper part of the container with a wire made of SUS, and 375 ml of pure water and 15 ml of phosphoric acid were put therein and hermetically sealed. The temperature of the aqueous solution is 70 ° C
And then add sodium nitrite 0.5
A color change test was performed by adding g to the solution to generate NOx gas. The test was terminated by contacting with NOx gas for 3 hours while maintaining 70 ° C. After the completion of the test, the test piece was washed with pure water, and the moisture was wiped off to obtain a hue measurement sheet.

(3) Hue Suga Tester SM color computer (model SM-
5) was used to measure the color difference of the sheet (sheet having a thickness of 3 mm). Measurement is by SM-5-CH type, 45 ° diffusion type optical system, focusing lens: φ1
2. Sample stage: Performed under the condition of φ12.

(4) Haze (unit:%) Measured according to JIS K7105. (5) Sliding property (unit: tan θ) Using a friction angle measuring machine manufactured by Toyo Seiki, size 6.3 cmL x 1
Using a load of 0.0 cmW × 1.9 cmH and a weight of 1 kg, the sliding angle (θ) was measured between the film surfaces and expressed as tan θ.

Example 1 To 100 parts by weight of Sumitomo Noblene RW150XG (ethylene-propylene copolymer, ethylene content: 3.2 mol%), 0.01 part by weight of the following hydrotalcite (DHT4C) and the following phosphite ester were added. Compound (1) 0.10 part by weight, erucic acid amide 0.065 part by weight, Sylysia 5
50 (manufactured by Fuji Silysia Chemical Ltd.) 0.10 parts by weight, Keiyo polyethylene G1900 (high density polyethylene, melt flow rate: 15.0 g / 10 minutes, density: 0.956 g
/ Cm ³ ) 0.10 parts by weight were mixed in advance and melt-mixed to obtain pellets. 3m thickness from the obtained pellets
Create a m pressed sheet was performed NO _X gas exposure test. The evaluation results are shown in Table 1. The obtained pellets are φ50m equipped with a coat hanger type T die with a width of 400mm.
m extruder, resin temperature 250 ℃, discharge rate 12Kg
/ hr, chill roll temperature 40 ℃, line speed 2
A film having a thickness of 30 μm was prepared by cooling with an air chamber cooling system at 0 m / min.

Hydrotalcite DHT4C (manufactured by Kyowa Chemical Industry Co., Ltd.) Chemical formula: Mg _4.5 Al ₂ (OH) ₁₃ (CO ₃ ) _0.8 · O _0.2 Loss of heating at each temperature (weight%); 100 ° C: 0.6% by weight, 200 ° C: 1.2% by weight, 300 ° C: 5.1% by weight

Phosphorous acid ester compound (1): 2,4,8,10-tetra-t-butyl-6- [3-
(3-Methyl-4-hydroxy-5-t-butylphenyl) propoxy] dibenzo [d, f] [1,3,2] dioxaphosphepin (CAS No. 203255-81-6) (Sumilyzer GP: Sumitomo Chemical Co., Ltd.

Example 2 Example 1 was repeated except that 0.10 part by weight of calcium hydroxide was used instead of hydrotalcite in Example 1.
I went the same way. Using the obtained pellets, press sheets and films were prepared in the same manner as in Example 1 and evaluated. The evaluation results are shown in Table 1.

Example 3 The procedure of Example 1 was repeated, except that 0.01 part by weight of calcium hydroxide and 0.05 part by weight of calcium stearate were used instead of hydrotalcite. Using the obtained pellets, press sheets and films were prepared in the same manner as in Example 1 and evaluated. The evaluation results are shown in Table 1.

Comparative Example 1 The procedure of Example 1 was repeated, except that 0.05 part by weight of calcium stearate was used instead of hydrotalcite. Using the obtained pellets, press sheets and films were prepared in the same manner as in Example 1 and evaluated. The evaluation results are shown in Table 1.

Comparative Example 2 Example 1 was repeated except that erucic acid amide was not used. Using the obtained pellets, press sheets and films were prepared in the same manner as in Example 1 and evaluated. The evaluation results are shown in Table 1.

[0054]

[Table 1]

[0055]

As described above in detail, according to the present invention, a polypropylene resin composition excellent in color tone and slipperiness and a film made of the resin composition can be obtained.

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 4F071 AA15X AA16 AA20 AA20X                       AA76 AB18 AB21 AC12 AC15                       AE05 AE11 AE22 AF27 AF30                       AF34 BA01 BB03 BB06 BC01                 4J002 BB121 BB141 BB151 DE066                       DE076 DE086 DE286 EP018                       EW067 GB00 GG01 GG02                       GN00 GQ00

Claims (5)

[Claims] 1. To 100 parts by weight of polypropylene (A), 0.001 to 0.2 parts by weight of an inorganic neutralizing agent (B) and phosphite ester (C) represented by the following general formula (I): )
0.01-1.0 parts by weight and fatty acid amides (D)
A polypropylene-based resin composition comprising 0.001 to 1.0 part by weight. (In the formula, R ¹ , R ² , R ⁴ and R ⁵ are each independently a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or 5 to 8 carbon atoms.
Represents a cycloalkyl group having 6 to 12 carbon atoms, an aralkyl group having 7 to 12 carbon atoms or a phenyl group, and R ³ represents a hydrogen atom or a carbon atom having 1 carbon atom.
~ 8 represents an alkyl group. X is a sulfur atom or -CH
R ⁶ — group (R ⁶ represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms or a cycloalkyl group having 5 to 8 carbon atoms),
n is 0 or 1. A represents an alkylene group having 2 to 8 carbon atoms or a * -CO (R ⁷ ) m-group (R ⁷ represents an alkylene group having 1 to 8 carbon atoms, * represents a bonding site with an oxygen atom, m Represents 0 or 1.). One of Y and Z has a hydroxyl group and has 1 to 8 carbon atoms.
Represents an alkoxy group or an aralkyloxy group having 7 to 12 carbon atoms, and the other represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms. ) 2. The polypropylene resin according to claim 1, wherein the inorganic neutralizing agent (B) is at least one selected from hydrotalcite, oxides or hydroxides of alkaline earth metals. Composition. 3. A fatty acid amide (D) has the general formula R ⁸ --CO
NH ₂ (wherein R ⁸ represents a saturated or unsaturated hydrocarbon group having 12 to 24 carbon atoms), R ⁹ —CONH— (C
H ₂₎ represents the _{^{l -NHCO-R 10 (R 9}} , R 10 are each independently saturated or unsaturated hydrocarbon group having a carbon number of 12 to 24 in the formula, l is an integer of 0.) The polypropylene-based resin composition according to claim 1, wherein 4. The polypropylene resin composition according to claim 1, which is used for film formation. 5. A film made of the polypropylene resin composition according to claim 1.