JP2007119745A - Polypropylene resin composition, and sheet and container composed of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polypropylene resin composition that can be molded into a sheet or a container exhibiting excellent rigidity, and the sheet and the container composed of the same. <P>SOLUTION: The polypropylene resin composition comprises a resin component comprised of 50-99.5 wt.% of a propylene polymer (A), 0.05-50 wt.% of a propylene polymer (B) (provided that the total of the polymer (A) and the polymer (B) is 100 wt.%) and 0.01-1 pt.wt., based on 100 pts.wt. of the resin component, of an aromatic phosphate ester compound represented by formula (I). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a polypropylene resin composition, a sheet comprising the same, and a container. More specifically, the present invention relates to a polypropylene resin composition capable of obtaining a sheet or container having excellent rigidity when formed into a sheet or container, and a sheet and container comprising the same.

Conventionally, it is known that a polypropylene resin is used as various molded articles.
For example, in JP-A-7-48473, as a means for improving transparency and impact strength, a specific amount of alkali metal carboxylate, alkali metal β-diketonate or alkali metal β-ketoacetic acid is added to a crystalline synthetic resin. A crystalline synthetic resin composition comprising at least one kind of ester salt and a specific amount of a cyclic organophosphate basic aluminum salt is described.

  JP-A-8-311253 discloses, as a means for improving the transparency of a molded product, a phosphate compound having a specific structure, a lithium aluminum composite hydroxide salt, and a specific amount of crystalline polyolefin, respectively. A crystalline polyolefin composition is described.

JP 7-48473 A JP-A-8-311253

However, even if the polyolefin resin composition described in the above publications is used for a sheet or a container, further improvement in the rigidity of the sheet or container has been desired.
Under such circumstances, an object of the present invention is to provide a polypropylene resin composition capable of obtaining a sheet or container having excellent rigidity when molded into a sheet or container, and a sheet and container comprising the same.

（式中、Ｒ¹は水素原子又は炭素原子数１〜４のアルキル基を表し、Ｒ²およびＲ³はそれぞれ独立に水素原子、炭素原子数１〜１２のアルキル基、シクロアルキル基、アリール基またはアラルキル基を表し、Ｍ¹はアルカリ金属原子、アルカリ土類金属原子、またはアルミニウム原子であり、Ｍ¹がアルカリ金属原子の場合、ｐは１であり、且つｑは０であり、Ｍ¹がアルカリ土類金属原子の場合、ｐは２であり、且つｑは０であり、Ｍ¹がアルミニウム原子の場合、ｐは１または２であり、且つｑは３−ｐである。） 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
The propylene content is 85-96.5 wt%, the ethylene content is 0.5-5 wt%, the α-olefin content having 4-20 carbon atoms is 3-10 wt%, A propylene polymer (A) having a melt flow rate (MFR) of 1 to 10 g / 10 min (provided that the total of propylene content, ethylene content and α-olefin content is 100% by weight), A polypropylene resin composition comprising 0.01 to 1 part by weight of an aromatic phosphate compound represented by the following formula (I) with respect to 100 parts by weight of the polymer (A), and a composition comprising the same. It relates to sheets and containers.

(In the formula, R ¹ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and R ² and R ³ independently represent a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, a cycloalkyl group, and an aryl group. Or an aralkyl group, M ¹ is an alkali metal atom, an alkaline earth metal atom, or an aluminum atom; when M ¹ is an alkali metal atom, p is 1, q is 0, and M ¹ is (In the case of an alkaline earth metal atom, p is 2, and q is 0. When M ¹ is an aluminum atom, p is 1 or 2, and q is 3-p.)

  ADVANTAGE OF THE INVENTION According to this invention, when shape | molded in a sheet | seat or a container, the polypropylene resin composition which can obtain the sheet | seat or container which is excellent in rigidity, and the sheet | seat and container consisting thereof can be obtained.

  The propylene-based polymer (A) used in the present invention has a propylene content of 85-96.5% by weight, an ethylene content of 0.5-5% by weight, and a carbon number of 4-20. It is a propylene-based polymer having an α-olefin content of 3 to 10% by weight (provided that the total of propylene content, ethylene content and α-olefin content is 100% by weight).

The ethylene content of the propylene polymer (A) is preferably 0.6 to 4% by weight, more preferably 0.7 to 3% by weight.
If the ethylene content of the propylene polymer (A) is below the lower limit, the transparency of the sheet or container may be deteriorated, and if it exceeds the upper limit, the rigidity of the sheet or container may be deteriorated. is there.

The content of the α-olefin having 4 to 20 carbon atoms in the propylene polymer (A) is preferably 3 to 9% by weight, more preferably 3 to 6% by weight.
If the content of the α-olefin having 4 to 20 carbon atoms of the propylene polymer (A) is lower than the above lower limit, the transparency of the sheet or the container may be deteriorated. Or the rigidity of the container may deteriorate.

  The ethylene content of the propylene polymer (A) and the α-olefin content of 4 to 20 carbon atoms adjust the weight ratio of propylene, ethylene and α-olefin used in the production of the propylene polymer (A). By doing so, it can be adjusted within the above range.

  The amount of the cold xylene-soluble component of the propylene-based polymer (A) is preferably 0.5 to 6% by weight, more preferably 0.6 to 6% from the viewpoint of enhancing the transparency and rigidity of the sheet or container. 5% by weight, more preferably 0.7-4% by weight.

In the present invention, the cold xylene-soluble component amount of the propylene-based polymer (A) is the content of the component soluble in xylene at 20 ° C. contained in the polymer (unit: wt%, hereinafter referred to as CXS). (Abbreviated).
And the measurement of CXS is performed in the following procedures. After dissolving 10 g of a sample (propylene polymer (A)) in 1000 ml of boiling xylene, the solution is gradually cooled to 50 ° C. The solution is then immersed in ice water, cooled to 20 ° C. with stirring, and further left at 20 ° C. overnight. The precipitated polymer is filtered off and xylene is removed from the filtrate by evaporation. The distillation residue is recovered by drying under reduced pressure at 60 ° C., and the weight W (g) of the recovered material is measured. CXS is calculated from the following equation.
CXS (wt%) = (W / 10) × 100

  The CXS of the propylene polymer (A) is selected by selecting a polymerization catalyst used for the production of the propylene polymer (A) and adjusting the stereoregularity of the propylene polymer (A), or of various monomers. It can adjust within the said range by adjusting content.

  Usually, when the stereoregularity of the propylene polymer (A) is increased, CXS is decreased, and when the stereoregularity is decreased, CXS is increased. Moreover, when content of the various monomers of a propylene polymer (A) is increased, CXS will become high, and when content of various monomers is reduced, CXS will become low.

  Examples of the α-olefin having 4 to 20 carbon atoms used in the propylene polymer (A) include 1-butene, 2-methyl-1-propene, 1-pentene, and 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-pentene, propyl Examples include -1-pentene, diethyl-1-butene, 1-nonene, 1-decene, 1-undecene, and 1-dodecene. 1-butene, 1-hexene, 1-hexene and 1-octene are preferable, and 1-butene and 1-hexene are more preferable from the viewpoint of excellent copolymerization characteristics and economy.

  Examples of the propylene polymer (A) include a propylene-ethylene-1-butene copolymer, a propylene-ethylene-1-hexene copolymer, and a propylene-ethylene-1-octene copolymer.

  The melt flow rate (MFR) measured at a temperature of 230 ° C. and a load of 21.18 N of the propylene polymer (A) is 1 to 10 g / 10 minutes, preferably 2 to 9 g / 10 minutes, more preferably. 3-7 g / 10 min.

  If the MFR of the propylene polymer (A) used in the present invention is below the lower limit, the extrusion load at the time of extrusion may increase, and if it exceeds the upper limit, the fluidity of the resin at the time of extrusion is high. It may deteriorate or the formability of the sheet or container may deteriorate.

As a manufacturing method of a propylene polymer (A), the method of manufacturing with a well-known polymerization method using a well-known polymerization catalyst is mentioned.
As a known polymerization catalyst, for example,
(1) a catalyst system comprising a solid catalyst component essentially containing magnesium, titanium and halogen, an organoaluminum compound, and a third component such as an electron donating compound used as necessary;
(2) a catalyst system comprising a transition metal compound of Group 4 of the periodic table having a cyclopentadienyl ring and an alkylaluminoxane,
(3) A catalyst system composed of a transition metal compound of Group 4 of the periodic table having a cyclopentadienyl ring and a compound that reacts with it to form an ionic complex, and an organoaluminum compound.
Preferred is a catalyst system comprising a solid catalyst component essentially containing magnesium, titanium and halogen, an organoaluminum compound, and an electron donating compound. For example, JP-A-61-218606, JP-A-61-287904 JP-A-1-319508, JP-A-7-216017, and the like.

Known polymerization methods include, for example, a slurry polymerization method using an inert hydrocarbon solvent, a solvent polymerization method, a solventless liquid phase polymerization method and a gas phase polymerization method, and preferably a gas phase polymerization method. .
Furthermore, a method of combining the above-described polymerization methods and continuously performing them, for example, a liquid phase-gas phase polymerization method and the like can be mentioned. For example, polymerization methods described in JP-A-7-216017 and the like can be mentioned.

式（Ｉ）
（式中、Ｒ¹は水素原子又は炭素原子数１〜４のアルキル基を表し、Ｒ²およびＲ³はそれぞれ独立に水素原子、炭素原子数１〜１２のアルキル基、シクロアルキル基、アリール基またはアラルキル基を表し、Ｍ¹はアルカリ金属原子、アルカリ土類金属原子、またはアルミニウム原子であり、Ｍ¹がアルカリ金属原子の場合、ｐは１であり、且つｑは０であり、Ｍ¹がアルカリ土類金属原子の場合、ｐは２であり、且つｑは０であり、Ｍ¹がアルミニウム原子の場合、ｐは１または２であり、且つｑは３−ｐである。） The aromatic phosphate ester compounds used in the present invention are compounds represented by the following formula (I).

Formula (I)
(In the formula, R ¹ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and R ² and R ³ independently represent a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, a cycloalkyl group, and an aryl group. Or an aralkyl group, M ¹ is an alkali metal atom, an alkaline earth metal atom, or an aluminum atom; when M ¹ is an alkali metal atom, p is 1, q is 0, and M ¹ is (In the case of an alkaline earth metal atom, p is 2, and q is 0. When M ¹ is an aluminum atom, p is 1 or 2, and q is 3-p.)

In the aromatic phosphate ester compounds represented by the above formula (I) used in the present invention, examples of the alkyl group having 1 to 4 carbon atoms represented by R ¹ include a methyl group, an ethyl group, a propyl group, i- A propyl group, an n-butyl group, a sec-butyl group, an i-butyl group and the like. Examples of the alkyl group having 1 to 12 carbon atoms represented by R ² and R ³ include a methyl group, an ethyl group, and a propyl group. I-propyl group, n-butyl group, sec-butyl group, t-butyl group, amyl group, t-amyl group, hexyl group, heptyl group, octyl group, i-octyl group, t-octyl group, 2- Examples include ethylhexyl group, nonyl group, i-nonyl group, decyl group, i-decyl group, undecyl group, dodecyl group, t-dodecyl group and the like.

Examples of the alkali metal atom represented by M ¹ in the above formula (I) used in the present invention include lithium, sodium, and potassium. Examples of the alkaline earth metal atom include beryllium, calcium, magnesium, Examples include strontium and barium.

M ¹ in the above formula (I) used in the present invention is preferably lithium or aluminum, and more preferably lithium.

When M ¹ of the above formula (I) used in the present invention is lithium, examples of the aromatic phosphate compound include lithium-2,2′-methylene-bis (4,6-dimethylphenyl) phosphate. ], Lithium-2,2'-ethylidene-bis (4,6-dimethylphenyl) phosphate, lithium-2,2'-methylene-bis (4,6-diethylphenyl) phosphate, lithium-2,2 ' Ethylidene-bis (4,6-diethylphenyl) phosphate, lithium-2,2′-methylene-bis (4,6-i-propylphenyl) phosphate, lithium-2,2′-ethylidene-bis (4 , 6-i-propylphenyl) phosphate, lithium-2,2′-methylene-bis (4,6-di-t-butylphenyl) phosphate, lithium -2,2'-ethylidene-bis (4,6-di-t-butylphenyl) phosphate, lithium-2,2'-methylene-bis (4-methyl-6-t-butylphenyl) phosphate, lithium -2,2'-ethylidene-bis (4-methyl-6-t-butylphenyl) phosphate, lithium-2,2'-methylene-bis (4-t-butyl-6-methylphenyl) phosphate, lithium -2,2'-ethylidene-bis (4-t-butyl-6-methylphenyl) phosphate, lithium-2,2'-methylene-bis (4-ethyl-6-t-butylphenyl) phosphate, lithium -2,2'-ethylidene-bis (4-ethyl-6-tert-butylphenyl) phosphate, lithium-2,2'-methylene-bis (4-i-propyl-6-tert-butyl) Tilphenyl) phosphate, lithium-2,2′-ethylidene-bis (4-i-propyl-6-tert-butylphenyl) phosphate, and the like.

When M ¹ of the above formula (I) used in the present invention is aluminum, examples of the aromatic phosphate compound include hydroxyaluminum-bis [2,2′-methylene-bis (4,6-dimethylphenyl). ) Phosphate], hydroxyaluminum-bis [2,2′-ethylidene-bis (4,6-dimethylphenyl) phosphate], hydroxyaluminum-bis [2,2′-methylene-bis (4,6-diethylphenyl) ) Phosphate], hydroxyaluminum-bis [2,2′-ethylidene-bis (4,6-diethylphenyl) phosphate], hydroxyaluminum-bis [2,2′-methylene-bis (4,6-i-) Propylphenyl) phosphate], hydroxyaluminum-bis [2,2′-ethylidene-bis (4 6-i-propylphenyl) phosphate], hydroxyaluminum-bis [2,2′-methylene-bis (4,6-di-t-butylphenyl) phosphate], hydroxyaluminum-bis [2,2′- Ethylidene-bis (4,6-di-t-butylphenyl) phosphate], hydroxyaluminum-bis [2,2′-methylene-bis (4-methyl-6-tert-butylphenyl) phosphate], hydroxyaluminum -Bis [2,2′-ethylidene-bis (4-methyl-6-tert-butylphenyl) phosphate], hydroxyaluminum-bis [2,2′-methylene-bis (4-tert-butyl-6-methyl) Phenyl) phosphate], hydroxyaluminum-bis [2,2′-ethylidene-bis (4-tert-butyl-6-methyl) Phenyl) phosphate], hydroxyaluminum-bis [2,2′-methylene-bis (4-ethyl-6-tert-butylphenyl) phosphate], hydroxyaluminum-bis [2,2′-ethylidene-bis (4 -Ethyl-6-t-butylphenyl) phosphate], hydroxyaluminum-bis [2,2′-methylene-bis (4-i-propyl-6-t-butylphenyl) phosphate], hydroxyaluminum-bis [ 2,2′-ethylidene-bis (4-i-propyl-6-tert-butylphenyl) phosphate] and the like.

As the aromatic phosphate ester compounds represented by the formula (I), commercially available products may be used. For example, ADK STAB NA71 (trade name, manufactured by ADEKA Corporation) in which M ^{1 in the} formula (I) is lithium, Moreover, Adeka stub NA21 (trade name, manufactured by ADEKA Corporation) in which M ^{1 in the} formula (I) is aluminum is exemplified.

  The content of the aromatic phosphate ester compound represented by the formula (I) used in the present invention is 0.01 to 1 part by weight, preferably 100 parts by weight of the propylene polymer (A), preferably It is 0.02-0.8 weight part, More preferably, it is 0.05-0.6 weight part.

  When the content of the aromatic phosphate ester compounds used in the invention is below the lower limit, transparency and rigidity may not be excellent. Further, if the content of the aromatic phosphate ester compounds used in the present invention exceeds the above upper limit, the sheet or the container made thereof may be fuzzy.

  You may add another additive to the polypropylene resin composition of this invention as needed. Examples of other additives include neutralizers, organic peroxides, weather resistance, flame retardancy, antistatic agents, plasticizers, lubricants, copper damage inhibitors, antioxidants, and antiblocking agents. . Other additives may be used alone or in combination of at least two kinds.

  Examples of the neutralizing agent include fatty acid calcium salts and hydrotalcite, and the content thereof is preferably 0.005 to 0.5 parts by weight with respect to 100 parts by weight of the propylene-based polymer (A). is there.

As the organic peroxide, those that are industrially easy to handle are preferred, and for example, those having a half-life at 150 ° C. of 0.5 minutes or more are preferred. Specific examples of such organic peroxides include 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, 1,1-bis (t-butylperoxy) 3, 3,5. -Trimethylcyclohexane, t-butylperoxy-i-propyl carbonate, t-butylpa-3,3,5-trimethylhexanoate, 1,3 bis (2-t-butylperoxy-i-propyl) benzene, etc. Can be mentioned.
Examples of the antioxidant include phenolic antioxidants, phosphorus antioxidants, sulfur antioxidants, and the like.

  If necessary, the polypropylene resin composition of the present invention may contain a polyethylene resin, an ethylene-α-olefin elastomer, and the like.

  As a method for producing the polypropylene resin composition of the present invention, a propylene polymer (A) and an aromatic phosphate ester compound are melt-kneaded with the various additives added as necessary. A method is mentioned. For example, using a mixer such as a tumbler mixer, a Henschel mixer, or a ribbon blender, the propylene-based polymer (A) and the aromatic phosphate ester compounds, and further the various additives added as necessary. And mixing, and then melt-kneading with a single-screw extruder, twin-screw extruder, Banbury mixer or the like to form a pellet.

The polypropylene resin sheet of the present invention is a sheet comprising the polypropylene resin composition of the present invention. Examples of a method for molding the polypropylene resin composition of the present invention into a sheet include molding methods used for normal sheet production such as an extrusion molding method, an injection molding method, a press molding method, and a calendar molding method.
Among these, an extrusion molding method is preferred, and an extrusion T-die molding method is more preferred because of good productivity and good transparency. As an extrusion T-die molding method, for example, a molten polypropylene resin composition is extruded from a T-die into a sheet using a single screw extruder, a twin screw extruder, a gear extruder, etc., and cooled and solidified with a metal cooling roll. An extruding T-die forming method is used.
The thickness of the sheet of the present invention is usually 0.1 to 3.0 mm, preferably 0.3 to 2.5 mm, from the viewpoint of obtaining sufficient strength and transparency. The sheet of the present invention may be a single sheet or a multilayer sheet made of different resins. Examples of the method for producing a multilayer sheet include a method for producing a multilayer sheet by an extrusion lamination method, a thermal lamination method, a dry lamination method and the like that are usually used.

  In addition, the polypropylene resin sheet may be uniaxially or biaxially stretched by, for example, a roll stretching method, a tenter stretching method, a tubular stretching method, or the like. Further, the surface treatment may be performed by a corona discharge treatment, a flame treatment, a plasma treatment, an ozone treatment or the like that is usually used.

Examples of a method for thermoforming the polypropylene resin sheet of the present invention into a polypropylene resin container which is a secondary molded body include known thermoforming methods such as vacuum forming, pressure forming, and vacuum / pressure forming.
As a heating method at the time of thermoforming, methods such as direct heating by a hot plate and indirect heating by a far infrared heater can be mentioned.
The thermoforming method is preferably a method of thermoforming at a relatively high pressure pressure in order to ensure good mold transferability, and more preferably, air leakage from the die mating surface or die life. This is a method in which thermoforming is performed in a range in which the decrease in the thickness hardly occurs, for example, in the range of 0.2 to 0.5 MPa.

  As the shape of the polypropylene resin container of the present invention, any shape can be selected according to the purpose. For example, a shape according to food packaging applications such as a lunch box type, bowl type, drink cup type, jelly cup type, etc., and a shape according to industrial applications such as a tray for storing precision parts can be selected.

  Hereinafter, the present invention will be described in detail by way of examples and comparative examples. Measurement of physical properties and preparation of samples used in Examples and Comparative Examples were performed according to the following methods.

[Measurement method of physical properties]
(1) Melt flow rate (MFR, unit: g / 10 minutes)
It was measured at a temperature of 230 ° C. and a load of 21.18 N according to the method of condition 14 (Condition Number 14) of JIS K7210.

(2) Ethylene and 1-butene content (unit: wt%)
Measurement was performed in accordance with a quantitative method by IR spectrum described in pages 616 to 619 of Polymer Handbook (1995, published by Kinokuniya Shoten).

(3) Melting point (Tm, unit: ° C)
The resin was hot-pressed (preheated at 230 ° C for 5 minutes, pressured up to 50 kgf / cm ² G over 3 minutes, held for 2 minutes, then cooled at 30 ° C and 30 kgf / cm ² G for 5 minutes) A 0.5 mm sheet was prepared, and a 10 mg sheet was heat-treated at 220 ° C. for 5 minutes in a nitrogen atmosphere using a differential scanning calorimeter (manufactured by PerkinElmer, Inc., DSC-7), and then the temperature drop rate was 300 ° C./min. Cool to 150 ° C., hold at 150 ° C. for 1 minute, further cool to 50 ° C. at a cooling rate of 50 ° C./minute, hold at 50 ° C. for 1 minute, and then increase the temperature from 50 ° C. to 180 ° C. at a rate of 5 ° C./minute In the melting curve obtained when heated at 1, the temperature showing the maximum peak was measured.

(4) Amount of cold xylene soluble component (CXS, unit: wt%)
After dissolving 10 g of sample in 1000 ml of boiling xylene, the solution was slowly cooled to 50 ° C. The solution was then immersed in ice water, cooled to 20 ° C. with stirring, and allowed to stand overnight at 20 ° C. The precipitated polymer was filtered off and xylene was removed from the filtrate by evaporation. The distillation residue was recovered by drying under reduced pressure at 60 ° C. The weight W (g) of the recovered material was measured. The cold xylene-soluble component amount (CXS (wt%)) was calculated from the following equation.
CXS (wt%) = (W / 10) × 100

(5) Transparency of sheet (haze, unit:%)
It measured according to JIS K7105.

(6) Sheet rigidity (Young's modulus, unit: MPa)
It measured according to JIS K7113.

(7) Transparency of container (haze, unit:%)
Measurement was performed according to JIS K7105 using, as a sample, a test piece cut from the center of the body of a polypropylene resin container obtained by pressure forming.

(8) Rigidity of container (Young's modulus, unit: MPa)
Measurement was performed according to JIS K7113 using a test piece cut out from the center of the trunk of a polypropylene resin container obtained by pressure molding.

(Producing method of propylene polymer (A-1))
Using the catalyst system obtained by the method described in Example 1 of JP-A-7-216017, as the catalyst conditions, the Al / Ti molar ratio is 600, the cyclohexylethyldimethoxysilane (Z) / Ti molar ratio is 40, As polymerization conditions, the polymerization temperature was 84 ° C., the polymerization pressure was 1.8 MPa, the feed amount of ethylene (unit: Kg) to the total feed amount (unit: Ton) of propylene, ethylene and 1-butene was 8 kg / Ton, The feed amount of 1-butene relative to the feed amount is 36 kg / Ton, the hydrogen concentration is 1.25 vol% (volume%), the ethylene concentration is 0.6 vol% (volume%), and the 1-butene concentration is 4.3 vol% (volume) Propylene, ethylene, 1-butene and hydrogen to feed propylene, ethylene and 1-butene. The by copolymerizing at gas phase polymerization, propylene below - to obtain ethylene-1-butene copolymer (A-1).
(A-1) Propylene-ethylene-1-butene copolymer MFR is 7.0 g / 10 min, Tm is 148 ° C., ethylene content is 1.0% by weight, and 1-butene content is It was 4.2% by weight and CXS was 1.4% by weight.

(Producing method of propylene polymer (A-2))
In the production method of the propylene polymer (A-1), the feed amount of ethylene is 20 kg / ton, the feed amount of 1-butene is 46 kg / ton, the ethylene concentration is 1.34 vol%, The following propylene-ethylene-1-butene copolymer (A-2) was obtained by carrying out in the same manner as in the production of the polymer (A-2) except that the concentration was changed to 4.4 vol%. .
(A-2) Propylene-ethylene-1-butene copolymer MFR is 5.7 g / 10 min, Tm is 136 ° C., ethylene content is 2.1 wt%, and 1-butene content is It was 5.8% by weight and CXS was 2.3% by weight.

[Aromatic phosphoric acid ester compounds]
Adeka stub NA71 (trade name) manufactured by ADEKA Corporation, where M ^{1 of} formula (I) is lithium, or ADEKA stub NA21 (trade name) manufactured by ADEKA, where M ^{1 of} formula (I) is aluminum is used. It was.

Example 1
0.20 parts by weight of Adeka Stub NA21 (trade name) made by ADEKA Co., Ltd., an aromatic phosphate compound based on 100 parts by weight of propylene-ethylene-1-butene copolymer (A-1), supplemented with chlorine 0.05 parts by weight of calcium stearate as an agent, tris (2,4-t-butylphenyl) phosphite / tetrakis [methylene-3 (3 ′, 5′-di-t-butyl-4-hydroxy) as an antioxidant Phenyl) propionate] methane) 3/1 part mixture was added in an amount of 0.255 parts by weight, mixed in a Henschel mixer for 3 minutes under a nitrogen atmosphere, and then melted at 250 ° C. using an extruder granulator having a screw diameter of 65 mmφ. Kneaded to obtain pellets. MFR measurement of the obtained pellet was performed and it was 7.6 g / 10 min.
The pellets obtained above were extruded by a T-die sheet processing machine (die width 450 mm) under the conditions of a screw diameter of 65 mmφ, a cylinder temperature of 250 ° C., a die temperature of 250 ° C., a take-off speed of 1.8 m / min, and a cooling roll temperature of 60 ° C. An extruded sheet (thickness: 1.65 mm, width: 45 cm) was molded and the physical properties were measured. The results are shown in Table 1.
Using a drink cup-shaped female mold having an aperture of 93 mmφ, a depth of 116 mm, and a bottom of 55.1 mm, the pressure is 0.3 MPa and the far infrared heater temperature is 350 ° C. The extruded sheet thus obtained was subjected to air pressure molding to obtain a polypropylene resin container as a secondary molded body. The test piece was cut out from the center of the trunk of the polypropylene resin container that was the obtained secondary molded body, and the physical properties of the cut-out test piece were measured. The results are shown in Table 1.

Example 2
Similar to Example 1 except that the propylene-ethylene-1-butene copolymer (A-1) used in Example 1 was changed to a propylene-ethylene-1-butene copolymer (A-2). Pellets were produced (6.0 g / 10 min), sheets and containers were molded, and physical properties were measured. The results are shown in Table 1.

Example 3
Example 1 except that the blending amount of Adeka Stub NA21 as an aromatic phosphate ester compound was changed to 0.10 parts by weight with respect to 100 parts by weight of the propylene-ethylene-1-butene copolymer (A-1). Similarly, pelletized (MFR = 7.5 g / 10 min), a sheet and a container were formed, and physical properties were measured. The results are shown in Table 1. The results are shown in Table 1.

Example 4
Pellets in the same manner as in Example 1 except that 100 parts by weight of the propylene-ethylene-1-butene copolymer (A-1) was changed to 0.20 parts by weight of Adeka Stub NA71 as an aromatic phosphate ester compound. (MFR = 7.3 g / 10 min), the sheet and the container were molded, and the physical properties were measured. The results are shown in Table 1. The results are shown in Table 1.

Example 5
Example 4 and Example 4 except that the blending amount of Adeka Stub NA71 as an aromatic phosphate ester compound was changed to 0.10 parts by weight with respect to 100 parts by weight of the propylene-ethylene-1-butene copolymer (A-1) Similarly, pelletized (MFR = 7.4 g / 10 min), a sheet and a container were formed, and physical properties were measured. The results are shown in Table 1. The results are shown in Table 1.

Example 6
Except for changing to 0.20 parts by weight of ADK STAB NA71 as an aromatic phosphate ester compound, pellets were produced in the same manner as in Example 2 (6.3 g / 10 min), a sheet and a container were molded, and the physical properties were 2 Set. The results are shown in Table 1.

Comparative Example 1
Except not using the aromatic phosphate ester compound used in Example 1, it pelletized similarly to Example 1 (MFR = 7.5g / 10min), the sheet | seat and the container were shape | molded, and the physical property was measured. The results are shown in Table 1. The results are shown in Table 1.

It turns out that the sheet | seat and container which consist of the polypropylene resin composition of Examples 1-6 which satisfy the requirements of this invention are excellent in rigidity, and are excellent also in transparency. And it turns out that the rigidity is further excellent in Examples 4-6 using Adega tab NA71 as aromatic phosphate ester compounds.
On the other hand, it can be seen that Comparative Example 1 in which the aromatic phosphate ester compounds which are the requirements of the present invention were not used is inferior in the rigidity of the container.

Claims (4)

A resin component containing 50 to 99.5% by weight of the following propylene polymer (A) and 0.05 to 50% by weight of the following propylene polymer (B) (however, the polymer (A) and the heavy 0.01 to 1 part by weight of the aromatic phosphate compound represented by the following formula (I) with respect to 100 parts by weight of the resin component) A polypropylene resin composition.
Propylene polymer (A): A propylene polymer having a melting point (Tm) of 100 to 149 ° C. and a melt flow rate (MFR) of 1 to 10 g / 10 min.
Propylene polymer (B): A propylene homopolymer or a propylene-ethylene copolymer having a propylene content of 99.6 to 99.99% by weight and an ethylene content of 0.01 to 0.4% by weight. A polymer (provided that the total of propylene content and ethylene content is 100% by weight), melting point (Tm) is 150 to 165 ° C., and melt flow rate (MFR) is 1 to 10 g / 10 min. A propylene polymer.

(In the formula, R ¹ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and R ² and R ³ independently represent a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, a cycloalkyl group, and an aryl group. Or an aralkyl group, M ¹ is an alkali metal atom, an alkaline earth metal atom, or an aluminum atom; when M ¹ is an alkali metal atom, p is 1, q is 0, and M ¹ is (In the case of an alkaline earth metal atom, p is 2, and q is 0. When M ¹ is an aluminum atom, p is 1 or 2, and q is 3-p.) The polypropylene resin composition according to claim 1, wherein M ¹ of the aromatic phosphate compound is a lithium atom or an aluminum atom.   A polypropylene resin sheet comprising the polypropylene resin composition according to claim 1. A polypropylene resin container obtained by thermoforming the polypropylene resin sheet according to claim 3.