JP2012236973A - Polypropylene resin composition, and film produced thereby - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film having high opacity and excellent in slidability and appearance, and to provide a polypropylene resin composition useful as the material of such a film.SOLUTION: The polypropylene resin composition is configured by melting and kneading a mixture including polypropylene (component A), polyethylene (component B) having a density of ≥0.900 to <0.970 g/cmand a melt flow rate measured at 190°C under 2.16 kg-load of 0.5-3 g/10 min, and a masterbatch (component C) impregnating powdery polyolefin with 1-30 mass% of an organic peroxide.

Description

  The present invention relates to a polypropylene resin composition capable of providing a film having high opacity and excellent slipperiness and appearance, and a film comprising the same.

Polypropylene resins are widely used in the fields of packaging, containers, home appliances, automobile parts, and the like.
Some films and sheets for food packaging, medical use, industrial use, agricultural use, etc. require high transparency (low haze value) depending on the application, and conversely high opacity (high haze value). Some are required.
As an opaque film, for example, in Patent Document 1, a film obtained by stretching at least uniaxially a composition made of crystalline polypropylene, polyethylene, and an organic peroxide is laminated on at least one surface of a biaxially stretched film made of crystalline polypropylene. A translucent biaxially stretched laminated film is described.
Patent Document 2 discloses a propylene copolymer, a low density polyethylene having an MFR at 190 ° C. of 1 g / 10 min or less, and a high density polyethylene having an MFR at 190 ° C. of 0.01 to 0.3 g / 10 min. A heat-sealable matte biaxially oriented polypropylene film, wherein a mixture containing a predetermined amount of an organic peroxide, a phenolic antioxidant and an alkali metal salt of a fatty acid is laminated on at least one side of the polypropylene film Is described.

Japanese Patent Laid-Open No. 56-38341 JP-A-5-329992

However, the film described in Patent Document 1 has insufficient opacity. Moreover, in the method described in Patent Document 2, since a very low MFR high-density polyethylene and low-density polyethylene are used, there is a concern about problems such as fish eyes.
The problem to be solved by the present invention is to provide a film having high opacity, excellent slipperiness and appearance, and further to provide a polypropylene resin composition useful as a material for such a film. .

The present invention is a propylene homopolymer, or a propylene random copolymer consisting of propylene and one or more comonomer, and having a comonomer content of 20% by mass or less (provided that the total mass of the propylene random copolymer is to 100% by mass.) and polypropylene (component (a)) is a density of less than 0.900 g / cm ³ or more 0.970g / cm ^3, 190 ℃, melt measured under 2.16kg load A polyethylene (component (B)) having a flow rate of 0.5 to 3 g / 10 min, and a master batch (component (C)) impregnated with 1 to 30% by mass of a powdered polyolefin with an organic peroxide (provided that, A total amount of the organic peroxide and the powdered polyolefin is 100% by mass). When a mixture makes the total amount of a component (A) and a component (B) 100 mass%, content of a component (A) is 65-95 mass%, and content of a component (B) is 5- The organic peroxide is 0.005 to 0.5 parts by mass with respect to 100 parts by mass in total of 35% by mass and the components (A) and (B). The present invention relates to a polypropylene resin composition characterized by being a mixture containing parts by mass.
Moreover, this invention concerns on the film which has 1 or more layers which consist of the said polypropylene resin composition.

  According to the present invention, a film having high opacity and excellent slipperiness and appearance can be obtained according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail.
The polypropylene resin composition of the present invention is
Component (A): a propylene homopolymer, or a propylene random copolymer comprising propylene and one or more comonomers and having a comonomer content of 20% by mass or less (however, the total mass of the propylene random copolymer) And 100% by mass of polypropylene)
Component (B): The density is 0.900 g / cm ³ or more and less than 0.970 g / cm ³ , and the melt flow rate measured under a load of 190 ° C. and 2.16 kg is 0.5 to ³ g / 10 min. Polyethylene,
Component (C): A master batch obtained by impregnating a powdered polyolefin with 1 to 30% by mass of an organic peroxide (provided that the total amount of the organic peroxide and the powdered polyolefin is 100% by mass). A polypropylene resin composition obtained by melt-kneading the mixture,
When the total amount of the component (A) and the component (B) in the mixture is 100% by mass, the content of the component (A) is 65 to 95% by mass, and the content of the component (B) is 5 It is -35 mass%, and 0.005-0.5 mass part of said organic peroxide is a mixture with respect to 100 mass parts in total of a component (A) and a component (B).

  The melt flow rate (hereinafter abbreviated as “MFR”) of the polypropylene resin composition of the present invention measured at 230 ° C. under a load of 2.16 kg is preferably from the viewpoint of processability of the composition. It is 0.1-100 g / 10min, More preferably, it is 0.1-50g / 10min, More preferably, it is 0.1-10g / 10min. The MFR of the composition can be adjusted by changing the molecular weight of component (A) and component (B) and the amount of component (C) added.

  The die swell ratio (hereinafter abbreviated as “SR”) of the polypropylene resin composition of the present invention is preferably 1.00 to 1.25, more preferably 1.01 to 1.20. . Here, SR of the polypropylene resin composition is a ratio between the diameter of the polypropylene resin composition extruded from the capillary die and the inner diameter of the capillary. Such SR was measured according to JIS K7199 at a test temperature of 230 ° C. and a nominal load of 2.16 kg.

The content of the component (A) and the component (B) contained in the mixture is the content of the component (A) when the total mass of the component (A) and the component (B) is 100% by mass. Is 65 to 95 mass%, the content of component (B) is 5 to 35 mass%, preferably the content of component (A) is 65 to 90 mass%, and the content of component (B) The amount is 10 to 35% by mass, more preferably the content of the component (A) is 65 to 80% by mass, and the content of the component (B) is 20 to 35% by mass.
When the content of the component (A) is less than 65% by mass, the film forming property of the composition is deteriorated, or the fish eyes of the film produced from the composition are frequently generated.

  The content of the organic peroxide derived from the component (C) contained in the mixture is 0.005 to 0.5 parts by mass with respect to 100 parts by mass in total of the component (A) and the component (B). Yes, preferably 0.005 to 0.3 parts by mass, and more preferably 0.01 to 0.1 parts by mass. When the content of the organic peroxide is less than 0.005 parts by mass, the film produced from the composition obtained by melt-kneading the mixture containing the organic peroxide has insufficient transparency (in other words, If this is the case, the haze value of the film is not sufficiently increased), and if it is more than 0.5 parts by mass, the film-forming property of the composition may be deteriorated. In addition, when the organic peroxide is added directly, the organic peroxide is not sufficiently dispersed, and fish eyes frequently occur in the resulting film. By using a masterbatch in which an organic peroxide is impregnated with a powdered polyolefin, the handling and safety of the organic peroxide can be improved and the organic peroxide can be easily and uniformly dispersed. The fish eyes of the obtained film can be reduced.

  Component (A) is preferably crystalline polypropylene, more preferably isotactic polypropylene. Here, “crystalline polypropylene” means a polypropylene having a peak (melting enthalpy) in a temperature range of 140 ° C. or higher in the temperature rising process of differential scanning calorimetry (DSC). Polypropylene is a propylene homopolymer or a propylene random copolymer composed of propylene and one or more comonomers. Examples of the comonomer include ethylene and α-olefins having 4 or more carbon atoms. . Examples of the random copolymer include a random copolymer of propylene and ethylene, a random copolymer of propylene and an α-olefin having 4 or more carbon atoms, and propylene, ethylene and an α-olefin having 4 or more carbon atoms. And a random copolymer. Examples of the α-olefin having 4 or more carbon atoms constituting the random copolymer include 1-butene, 4-methylpentene-1, 1-octene, 1-hexene and the like, and preferably 1-butene. It is.

  When component (A) is a propylene-based random copolymer, the amount of comonomer contained in the copolymer is determined based on the total mass of the copolymer from the viewpoint of the rigidity of the molded article made of the polypropylene resin composition. Is 100% by mass, it is 20% by mass or less, preferably 15% by mass or less, and more preferably 10% by mass or less.

  The melting point of the component (A) is preferably 120 ° C. or higher, more preferably 125 ° C. or higher and 166 ° C. or lower, from the viewpoint of the rigidity of the molded body made of the polypropylene resin composition.

  According to JIS-K7210, the MFR of the component (A) measured at 230 ° C. under a load of 2.16 kg is preferably 0.1 to 10 g / 10 minutes from the viewpoint of the extrusion characteristics of the polypropylene resin composition. More preferably, it is 1-10 g / 10min.

Component (A) can be produced by a known polymerization method using a known polymerization catalyst.
Known polymerization catalysts include, for example, a catalyst system comprising a solid catalyst component containing magnesium, titanium and halogen, an organoaluminum compound, and a third component such as an electron donating compound used as necessary, cyclopenta A catalyst system comprising a group IV transition metal compound having a dienyl ring and an alkylaluminoxane, and a group IV transition metal compound having a cyclopentadienyl ring, and reacting with it to form an ionic complex Examples thereof include a catalyst system comprising a compound to be formed and an organoaluminum compound. Preferred is a catalyst system comprising a solid catalyst component 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 liquid phase polymerization method without solvent, a gas phase polymerization method, etc., preferably a gas phase polymerization method, or Examples include a method in which two or more of the above polymerization methods are continuously performed, for example, a liquid phase-gas phase polymerization method.

As the component (B), for example, a so-called “low density polyethylene” having a density of 0.900 g / cm ³ or more and less than 0.945 g / cm ³ , a density of 0.945 g / cm ³ or more and 0.970 g / cm ^3. Examples include so-called “high-density polyethylene” which is less than ³ polyethylene. When polyethylene having a density of less than 0.900 g / cm ³ is blended in place of the component (B), the haze of the film may not be sufficiently high.

When polyethylene having a density of 0.900 g / cm ³ or more and less than 0.945 g / cm ³ is used as the component (B), examples of the polyethylene include high-pressure low-density polyethylene by a tubular method or a Vessel method. Alternatively, linear low density polyethylene which is a copolymer of ethylene and α-olefin may be used. Examples of the α-olefin constituting the polyethylene include 1-butene, 1-hexene, 1-octene, and the like, and preferably 1-hexene.

  The melting point of component (B) is preferably 100 ° C. or higher and lower than 140 ° C., more preferably 110 ° C. or higher and lower than 140 ° C. From the viewpoint of heat resistance of the polypropylene resin composition, the melting point of the component (B) is preferably 100 ° C. or higher.

  According to JIS-K7210, MFR of the component (B) measured under 190 degreeC and 2.16kg load is 0.5-3g / 10min, Preferably, it is 0.5-2g / 10min. If the MFR of component (B) is less than 0.5 g / 10 min, it may cause fish eyes in the resulting film. If it exceeds 3 g / 10 min, the resulting film has sufficient opacity. May not go up.

  The organic peroxide used for the adjustment of the component (C) is a solid at 10 ° C. or higher and lower than 30 ° C., or a liquid at 10 ° C. or higher and lower than 120 ° C. Even if it is solid at 10 ° C. or more and less than 30 ° C., it may be dissolved in a temperature range up to 120 ° C. by heating to become liquid. A component (B) can be used 1 type or in mixture of 2 or more types.

Moreover, as an organic peroxide used for adjustment of a component (C) which is solid at 10 degreeC or more and less than 30 degreeC, a powdery or granular thing can be illustrated. The particle size is not particularly limited, but is usually 100 to 2000 μm (or 9 mesh sieve) from the viewpoint of the convenience of handling and the purpose of adjusting the uniform component (C), preferably Is from 100 to 1000 μm (or through a 16 mesh screen), more preferably from 100 to 500 μm (or through a 32 mesh screen). Here, the particle size, the particle size corresponding to weight percentage 50% of the particles size accumulation curve (hereinafter, referred to as D ₅₀₎ is that.

  Examples of the organic peroxide used for preparing the component (C) include alkyl peroxides, diacyl peroxides, peroxide esters, and carbonates. Examples of alkyl peroxides include dicumyl peroxide, di-tert-butyl peroxide, di-tert-butylcumyl peroxide, 2,5-dimethyl-2,5-di (tert-butylperoxy) hexane. 2,5-dimethyl-2,5-di (tert-butylperoxy) hexyne-3, tert-butylcumyl, 1,3-bis (tert-butylperoxyisopropyl) benzene, 3,6,9-triethyl- 3,6,9-trimethyl-1,4,7-triperoxonane and the like can be mentioned.

  Examples of the diacyl peroxides include benzoyl peroxide, lauroyl peroxide, decanoyl peroxide, and the like. Examples of peroxide esters include 1,1,3,3-tetramethylbutylperoxyneodecanoate, α-cumylperoxyneodecanoate, tert-butylperoxyneodecanoate, and tert-butyl. Peroxyneoheptanoate, tert-butyl peroxypivalate, tert-hexyl peroxypivalate, 1,1,3,3-tetramethylbutylperoxy-2-ethylhexanoate, tert-amyl peroxyl- 2-ethylhexanoate, tert-butylperoxy-2-ethylhexanoate, tert-butylperoxyisobutyrate, di-tert-butylperoxyhexahydroterephthalate, tert-amylperoxy3,5,5 -Trimethylhexanoate, tert-butyl Okishi 3,5,5-trimethyl hexanoate, tert- butylperoxy acetate, tert- butyl peroxybenzoate, di - butylperoxy trimethyl Adi adipate, and the like.

  Examples of the peroxide carbonates include di-3-methoxybutyl peroxydicarbonate, di (2-ethylhexyl) peroxydicarbonate, diisopropyl peroxycarbonate, tert-butylperoxyisopropyl carbonate, and di (4-t- Butylcyclohexyl) peroxydicarbonate, dicetyl peroxydicarbonate, dimyristyl peroxydicarbonate and the like.

  The organic peroxide used for the preparation of component (C) is preferably alkyl peroxides, more preferably 2,5-dimethyl-2,5-di (tert-butylperoxy) hexane, 1 , 3-bis (tert-butylperoxyisopropyl) benzene or 3,6,9-triethyl-3,6,9-trimethyl-1,4,7-triperoxonan.

  The component (C) is an impregnated powder (masterbatch) prepared by impregnating a powdered polyolefin with an organic peroxide. In the present specification, the impregnated powder is referred to as a “masterbatch”. By using such a master batch, the handling property of the organic peroxide during processing of the polypropylene resin composition is improved, and a polypropylene resin composition capable of giving a film with less fish eyes is obtained. The content of the organic peroxide in the component (C) is 1 to 30% by mass, preferably 3 to 20% by mass (provided that the total amount of the organic peroxide and the powdered polyolefin is 100% by mass). And).

The particle diameter (D ₅₀ ) corresponding to 50% by mass of the particle diameter accumulation curve of powdered polyolefin obtained by the laser diffraction particle size distribution measurement method is the dispersion of the organic peroxide during processing of the polypropylene resin composition. From a viewpoint of property, Preferably, it is 200 micrometers-700 micrometers.

  The powdery polyolefin used for the preparation of the component (C) is a propylene homopolymer in one embodiment, a structural unit derived from propylene in another embodiment, a structural unit derived from ethylene, and a carbon number of 4 to 10 It is a propylene copolymer having at least one structural unit selected from the group consisting of structural units derived from α-olefins. In yet another embodiment, it is a mixture thereof. In addition, “structural unit derived from ethylene” and “structural unit derived from α-olefin having 4 to 10 carbon atoms” may be collectively referred to as “structural unit derived from comonomer”.

  The powdery polyolefin is preferably a polyolefin having 80 to 100% by mass of structural units derived from propylene and 0 to 20% by mass of structural units derived from comonomer (provided that structural units derived from propylene and comonomer The total of the derived structural units is 100% by mass.).

  The content of the structural unit derived from propylene and the structural unit derived from the comonomer contained in the propylene copolymer as the powdered polyolefin is preferably 80 to 99. 9 mass%, the content of structural units derived from comonomer is 0.1 to 20 mass%, more preferably the content of structural units derived from propylene is 85 to 99.9 mass%, The content of the structural unit derived from the comonomer is 0.1 to 15% by mass, more preferably the content of the structural unit derived from propylene is 90 to 99% by mass, and the content of the structural unit derived from the comonomer The amount is 1 to 10% by mass, and particularly preferably, the content of structural units derived from propylene is 90 to 97% by mass, and the structure is derived from a comonomer Position is 3 to 10 mass% content of (but. For the content of the structural unit derived from propylene, and total 100 mass% of the content of structural units derived from the comonomer).

  Examples of the α-olefin having 4 to 10 carbon atoms contained in the propylene copolymer include 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene and 1-decene. 1-butene, 1-hexene or 1-octene is preferred.

  Examples of the propylene copolymer include a propylene-ethylene random copolymer, a random copolymer of propylene and an α-olefin having 4 to 10 carbon atoms, and a random of propylene, ethylene and an α-olefin having 4 to 10 carbon atoms. A copolymer etc. are mentioned. As a random copolymer of propylene and an α-olefin having 4 to 10 carbon atoms, a propylene-1-butene random copolymer, a propylene-1-hexene random copolymer, a propylene-1-octene random copolymer, Examples include propylene-1-decene random copolymers. As a random copolymer of propylene, ethylene, and an α-olefin having 4 to 10 carbon atoms, propylene-ethylene-1-butene copolymer, propylene-ethylene-1-hexene copolymer, propylene-ethylene-1- Examples include octene copolymers and propylene-ethylene-1-decene copolymers. The powdery polyolefin for component (C) may be a mixture of these propylene copolymers, or a mixture of a propylene homopolymer and a propylene copolymer.

  The powdery polyolefin is preferably propylene-ethylene random copolymer particles, propylene-1-butene random copolymer particles or propylene-ethylene-1-butene random copolymer particles, more preferably propylene. Ethylene-propylene random copolymer particles having 90 to 97 mass% derived structural units and 3 to 10 mass% structural units derived from ethylene, 90 to 97 mass% structural units derived from propylene, and 1-butene Ethylene-propylene random copolymer particles having a structural unit derived from 3 to 10% by mass, or 80 to 98% by mass of a structural unit derived from propylene, 1 to 10% by mass of a structural unit derived from ethylene, and 1 Ethylene-propylene random having 1-10% by weight of structural units derived from butene Polymer particles, more preferably ethylene-propylene random copolymer particles having 93 to 97% by mass of structural units derived from propylene and 3 to 7% by mass of structural units derived from ethylene, derived from propylene. Ethylene-propylene random copolymer particles having 93 to 97 mass% of structural units and 3 to 7 mass% of structural units derived from 1-butene, or 85 to 98 mass% of structural units derived from propylene, and ethylene It is an ethylene-propylene random copolymer particle which has 1 to 5 mass% of structural units derived from and 1 to 10 mass% of structural units derived from 1-butene.

  The powdery polyolefin is preferably copolymer particles of propylene and other olefins exhibiting crystallinity. The degree of crystallinity of the copolymer can be represented by the amount of 20 ° C. xylene-soluble part (hereinafter referred to as CXS) contained in the copolymer. A large amount of CXS in the copolymer means that the copolymer has many amorphous parts, and the copolymer has low crystallinity. A low CXS in the copolymer means that the copolymer has a low CXS. The coalescence has few amorphous parts, indicating that the copolymer is highly crystalline.

  The content of CXS in the powdered polyolefin is preferably 0.5% by mass or more and less than 20% by mass, more preferably 0.5% by mass or more and less than 10% by mass, and further preferably 1% by mass. % Or more and less than 5% by mass.

  The melting point of the powdered polyolefin is preferably 120 ° C. or higher and lower than 160 ° C. Here, the melting point means the peak temperature of the endothermic curve measured by differential scanning calorimetry (DSC). The melting point of the powdered polyolefin is an index of the degree of crystallinity of the powdered polyolefin used for the component (C), similarly to the CXS content.

  The MFR of the powdery polyolefin measured at a temperature of 230 ° C. and a load of 2.16 kg is preferably 1 to 50 g / 10 min from the viewpoint of the physical properties of the obtained film and the suppression of the generation of fish eyes in the film. More preferably, it is 1-30 g / 10 minutes, More preferably, it is 2-20 g / 10 minutes.

  The intrinsic viscosity ([η]) of the powdered polyolefin measured in 135 ° C. tetralin is preferably 1 dl / g or more and 3 dl / g from the viewpoint of the physical properties of the obtained film and the suppression of the generation of fish eyes in the film. More preferably, it is 1.3 dl / g or more and less than 3 dl / g, More preferably, it is 1.5 dl / g or more and 2.5 dl / g.

Apparent bulk density of the powdered polyolefin is preferably less than 0.20 g / cm ³ or more 0.45 g / cm ^3.

  The powdered polyolefin is preferably a collection of particles having a particle size distributed within a specific range. The particle size distribution is obtained by a laser diffraction particle size distribution measurement method (however, a dry method not using a medium). The dry laser diffraction particle size distribution measuring method is a method of measuring particle size distribution without using a solvent by using a laser diffraction particle size distribution measuring device (for example, HELOS & RODOS (trade name) manufactured by Sympatec). It is.

The content of particles having a particle size of less than 100 μm in the powdered polyolefin is preferably 1% by mass or more and less than 20% by mass, and the content of particles having a particle size of less than 300 μm is preferably 5% by mass or more and 80% by mass. %, And the content of particles having a particle diameter of less than 1000 μm is preferably 80% by mass or more. The particle diameter (D ₅₀ ) corresponding to a mass percentage of 50% of the particle diameter accumulation curve of the powdered polyolefin is preferably 100 μm or more and less than 700 μm, and the particle diameter corresponding to a mass percentage of 99% of the particle diameter accumulation curve (hereinafter, D referred to as ₉₉₎ is preferably less than or 500 [mu] m 2000 .mu.m.

Regarding the particle size distribution of the powdered polyolefin, from the viewpoints of increasing the content of the organic peroxide in the component (C), uniformity of the concentration, and handling of the component (C), the particle size is preferably 100 μm. The content of particles less than 10% by mass is less than 1% by mass, the content of particles less than 300 μm is less than 10% by mass and less than 70% by mass, and the content of particles less than 1000 μm is 80% D ₅₀ is 200 μm or more and less than 700 μm, D ₉₉ is 700 μm or more and less than 2000 μm, and more preferably, the content of particles having a particle diameter of less than 100 μm is 1% by mass or more and less than 5% by mass. The content of particles having a particle size of less than 300 μm is 10% by mass or more and less than 50% by mass, the content of particles having a particle size of less than 1000 μm is 80% by mass or more, D ₅₀ is less than than 300μm _{700μm, D 99} or more and less than 900 .mu.m 2000 .mu.m.

  Examples of the powdered polyolefin include polyolefin particles produced by a known polymerization method using a known polymerization catalyst and olefin as a monomer, and particles obtained by pulverizing a polyolefin produced by a known polymerization method. Examples thereof include particles obtained by melt-kneading a polyolefin produced by a known polymerization method at a temperature equal to or higher than its melting point, then cooling and solidifying, and pulverizing the obtained solidified product.

  As a polymerization catalyst used for the production of the polyolefin particles or polyolefin, a Ziegler type catalyst system; a Ziegler-Natta type catalyst system; a catalyst comprising a compound of a periodic table Group IV transition metal having a cyclopentadienyl ring and an alkylaluminoxane A catalyst system comprising a compound of a Group IV transition metal having a cyclopentadienyl ring, a compound that reacts with it to form an ionic complex, and an organoaluminum compound; and silica and clay minerals Exemplifying a catalyst system in which a catalyst component such as a compound of a periodic table group IV transition metal having a cyclopentadienyl ring, a compound forming an ionic complex, and an organoaluminum compound is supported on various inorganic particles it can. These catalyst systems are disclosed in, for example, JP-A-61-218606, JP-A-5-194485, JP-A-7-2116017, JP-A-9-316147, JP-A-10-212319, This is described in Japanese Unexamined Patent Application Publication No. 2004-182981 and Japanese Unexamined Patent Application Publication No. 2004-066785. The polymerization catalyst may be a prepolymerization catalyst prepared by prepolymerizing a monomer in the presence of the above catalyst system.

  As a method for producing polyolefin particles or polyolefins, a bulk polymerization method in which a liquid olefin is used as a medium at a polymerization temperature; polymerization is performed in an inert hydrocarbon solvent such as propane, butane, isobutane, pentane, hexane, heptane and octane. Examples thereof include a solution polymerization method and a slurry polymerization method to be performed; and a gas phase polymerization method in which a gaseous monomer is polymerized in the medium using the gaseous monomer as a medium. These polymerization methods are carried out batchwise, continuously, or a combination thereof. These polymerization methods may also be performed in a continuous multi-stage manner in which two or more polymerization reaction tanks connected to each other are used to adjust the composition and characteristics of the polymer in each polymerization reaction tank. Among these, from an industrial and economical viewpoint, a continuous gas phase polymerization method or a bulk-gas phase polymerization method in which a bulk polymerization method and a gas phase polymerization method are continuously performed is preferable. Conditions such as a polymerization temperature, a polymerization pressure, a monomer concentration, a catalyst input amount, and a polymerization time in the polymerization process in these polymerization methods are appropriately changed and determined depending on the powdered polyolefin used for component (C). The The polyolefin particles or polyolefin may be dried at a temperature lower than its melting temperature in order to remove by-products such as ultra-low molecular weight oligomers and residual solvent in the polymer.

  When the powdered polyolefin used for component (C) is particles obtained by melt-kneading polyolefin at a temperature equal to or higher than the melting point, then cooling and solidifying, and pulverizing the resulting solidified product, Examples of the melt-kneading method include a method of melt-kneading at a temperature equal to or higher than the melting point using a known melt-kneading apparatus such as a melt extruder or a Banbury mixer. When the polyolefin is a propylene polymer, the temperature during melt kneading is preferably 180 ° C. or higher, more preferably 180 to 300 ° C., and still more preferably 180 to 250 ° C.

  As a known melt-kneading apparatus, single screw extrusion such as SE (registered trademark) manufactured by Toshiba Machine Co., Ltd., FS (registered trademark) manufactured by Ikegai Co., Ltd., SZW (registered trademark) manufactured by Technobel Co., Ltd., etc. Machine, ZSK (registered trademark) manufactured by Coperion Werner Pfleiderer, TEM (registered trademark) manufactured by Toshiba Machine Co., Ltd., TEX (registered trademark) manufactured by Nippon Steel Works, Ltd., and KZW (registered trademark) manufactured by Technobel Co., Ltd. ) And a twin screw co-rotating extruder, such as CMP (registered trademark) manufactured by Nippon Steel Works, FCM (registered trademark), NCM (registered trademark), and LCM (registered trademark) manufactured by Kobe Steel, Ltd. (Trademark) can be exemplified.

  Examples of the shape of the solidified product obtained by melt-kneading polyolefin and further solidifying by cooling can include strands, sheets, flat plates, and pellets obtained by cutting strands into appropriate lengths.

  The powdery polyolefin used for the component (C) may contain known additives such as a neutralizing agent and an antioxidant in order to suppress and stabilize the oxidative deterioration during storage. The additives may be blended by a known mixing method such as a stirring and mixing method using a mixer or the like, or a melt-kneading method. When blending the additive, the blending amount is usually 0.001 to 0.5 parts by weight, preferably 0.01 to 0.2 parts by weight with respect to 100 parts by weight of the powdered polyolefin. It is.

  In the case of using particles obtained by pulverizing polyolefin, or particles obtained by melting and kneading polyolefin at a temperature equal to or higher than the melting point, then cooling and solidifying, and pulverizing the obtained solidified product as the powdered polyolefin A known crusher can be used for the production of the particles.

  Known mills include spiral mill, turbo mill, pin mill, hammer mill, JET mill, jet airflow mill (single track jet mill, jet oh mill), cutter mill, rotary cutter mill, bead mill, ball mill, roll mill, star mill, jaw Examples include a crusher mill, an impeller mill, a vibration mill, an impact pulverizer, and the like.

A preferable pulverization method for obtaining a powdery polyolefin having a target particle size distribution includes a freeze pulverization method in which pulverization is performed using liquid nitrogen.
In the freeze pulverization method, particles obtained by pulverizing polyolefin in an atmosphere of liquid nitrogen (about −196 ° C.), or polyolefin kneaded at a temperature higher than the melting point, then cooled and solidified, and the obtained solidified product is After cooling the particles obtained by pulverization to a temperature below the embrittlement point, pulverization is performed using a pulverizer such as a turbo mill, a pin mill, a hammer mill, a linlex mill, an impeller mill, or a spiral mill. .

In addition, particles obtained by pulverizing polyolefin can be passed through a filter in order to achieve the desired particle size distribution. As such a filter, a filter having a known specification can be used.
Known filters include woven wire mesh, crimp wire mesh, welded wire mesh, demister, spiral wire mesh, laminated metal filter, metal sintered filter, and the like. Examples of the woven wire mesh include a plain woven wire mesh, a twill woven wire mesh, a satin woven wire mesh, a plain woven wire mesh, a twill woven wire mesh, and the like. The material of the filter may be either metal or resin, and is preferably made of stainless steel. The polyolefin pulverized particles may be passed through one filter, may be passed through a plurality of stacked filters, or may be passed through the filter in one stage or in two or more stages, which are different. A filter with specifications (material, shape, opening, etc.) may be used in combination. The opening of the filter is appropriately determined according to the target particle size distribution. From the viewpoint of obtaining a powdered polyolefin excellent in the high content of the organic peroxide in the component (C), the uniformity of the concentration, and the handleability of the component (C), it is preferably 100 to 3000 μm, more preferably Is 300 to 2000 μm, more preferably 300 to 1500 μm. The opening of the filter is a value determined by the particle diameter (μm) of the largest glass bead that passes through the filter medium according to the method of JIS-B8356.

  When the powdered polyolefin used for component (C) is a particle obtained by pulverizing polyolefin, component (C) that can contain organic peroxide at a high concentration and is excellent in handleability is efficiently produced. From the viewpoint, it is necessary that the polyolefin particles satisfy a specific particle size distribution, and the polyolefin used for pulverization preferably has a large particle size.

Powdery polyolefin used in the component (C) is, in the case of particles obtained by pulverizing a polyolefin, size represented by D ₅₀ of polyolefin before pulverization is preferably, 700～5000Myuemu, more preferably Is 700 to 3000 μm, more preferably 700 to 1500 μm.

  The longest when the powdered polyolefin used for the component (C) is particles obtained by melt-kneading polyolefin at a temperature equal to or higher than the melting point, then cooling and solidifying, and pulverizing the obtained solidified product. The magnitude | size of this solidified material represented by the length of the part is 1-50 mm normally, Preferably it is 2-10 mm, More preferably, it is 2-5 mm. The shape of the solidified product is preferably a pellet having a diameter of 2 to 5 mm from the viewpoints of productivity and production stability of particles obtained by pulverizing the solidified product.

  As a method of impregnating the powdered polyolefin used for the component (C) with the organic peroxide, a method of adding the organic peroxide while mixing the powdered polyolefin using a known mixer is preferable. Examples of known mixers include tumble mixers, Henschel mixers, super mixers, and the like.

In this invention, you may add an additive to the said mixture containing the said component (A), a component (B), and a component (C) as needed. Examples of the additive include an antioxidant, an ultraviolet absorber, an antistatic agent, a lubricant, a nucleating agent, an antifogging agent, and an antiblocking agent.
The blending amount of such additives is preferably 0.01 to 0.5 parts by mass with respect to 100 parts by mass in total of the component (A) and the component (B).

  As the lubricant, known hydrocarbon compounds, fatty acid compounds, higher alcohol compounds, fatty acid amide compounds, fatty acid ester compounds, metal soap compounds, which are known as resin lubricants, particularly fatty acid amide compounds can be used. It is preferable to use a metal soap compound.

  Examples of the hydrocarbon compound include liquid paraffin, paraffin wax, and synthetic polyethylene wax. Examples of fatty acid compounds include myristic acid, palmitic acid, stearic acid, alkydic acid, behenic acid, lignoceric acid, oleic acid, erucic acid, nervonic acid, linoleic acid, linolenic acid, arachidonic acid and the like. Examples of higher alcohol compounds include stearyl alcohol, behenyl alcohol, oleyl alcohol, lauryl alcohol, and the like. As the fatty acid amide compound, a saturated fatty acid amide compound or an unsaturated fatty acid amide compound is used. Myristic acid amide, palmitic acid amide, stearic acid amide, alkydic acid amide, behenic acid amide, lignoceric acid amide, oleic acid amide , Erucic acid amide, nervonic acid amide, linoleic acid amide, linolenic acid amide, arachidonic acid amide, ethylene bis octadecanamide, methylene bis stearic acid amide, ethylene bis stearic acid amide, ethylene bishydroxy stearic acid amide, ethylene biscaprylic acid amide , Ethylene biscapric acid amide, and the like, preferably oleic acid amide, behenic acid amide, and erucic acid amide, and more preferably erucic acid amide. Examples of fatty acid ester compounds include stearyl stearate, stearic acid monoglyceride, hydrogenated castor oil, and the like. As metal soap compounds, lithium stearate, magnesium stearate, calcium stearate, barium stearate, zinc stearate, calcium laurate, barium laurate, zinc laurate, zinc octylate, calcium ricinoleate, barium ricinoleate, ricinoleic acid Examples thereof include zinc, zinc behenyl phosphate, and zinc stearyl phosphate, and preferred are magnesium stearate and calcium stearate.

The film of the present invention is a film having one or more layers made of the above polypropylene resin composition, and is obtained by forming the composition.
From the viewpoint of rigidity and transparency, the thickness of the film of the present invention is preferably 5 μm or more and less than 100 μm, more preferably 10 μm or more and less than 80 μm, and still more preferably 10 μm or more and less than 70 μm.

  As a method for forming a film from the polypropylene resin composition of the present invention, for example, other than a method of forming a film as a single layer using a T-die method, an inflation method, a calendar method, etc., which are usually used in the production of a resin film The method of forming into a film as at least 1 layer of a multilayer film is mentioned.

  The film of the present invention may be a single layer film or a multilayer film including at least one layer composed of the polypropylene resin composition of the present invention. The film of the present invention may be an unstretched film, or a stretched film produced by stretching the unstretched film in a uniaxial direction or a biaxial direction. Preferably, it is an unstretched film.

  The multilayer film is a film comprising a layer comprising the polypropylene resin composition of the present invention and other layers. Examples of other layers include a layer comprising propylene homopolymer, propylene and ethylene, and α having 4 or more carbon atoms. A layer composed of a propylene random or block copolymer composed of at least one comonomer selected from the group consisting of olefins, an olefin resin such as these propylene polymer polyethylene and polybutene, ethylene and α-olefin And a layer of a mixture with a copolymer elastomer, polypropylene biaxially stretched film, unstretched or stretched nylon film, stretched polyterephthalate film and the like.

  Examples of the method for producing the multilayer film include a co-extrusion method, an extrusion laminating method, a heat laminating method, and a dry laminating method.

  Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. The measuring methods of physical properties used in Examples and Comparative Examples are shown below.

(1) Melt flow rate (MFR, unit: g / 10 minutes)
It measured according to JIS K7210.
Polypropylene: (230 ° C., 2.16 kg load)
Polyethylene: (190 ° C, 2.16 kg load)

(2) Comonomer content in polypropylene (unit: mass%)
Measurement was carried out by infrared spectroscopy by the method described on page 616 et seq. Of Polymer Analysis Handbook (published by Kinokuniya, 1995).

(3) 20 ° C. xylene-soluble component amount in polypropylene (CXS, unit: mass%)
After 1 g of the sample was completely dissolved in 100 ml of boiling xylene, the temperature was lowered to 20 ° C. and left for 4 hours. Thereafter, this was separated into a precipitate and a solution, and the filtrate was dried and dried at 70 ° C. under reduced pressure to obtain a residue. The mass of the obtained residue was measured to determine the 20 ° C. xylene-soluble component amount (CXS).

(4) Melting point (Tm, unit: ° C)
Using a differential scanning calorimeter (Perkin Elmer DSC), about 10 mg of the test piece was held at 220 ° C. for 5 minutes under a nitrogen atmosphere, and then cooled to 150 ° C. at 300 ° C./min. After maintaining at 150 ° C. for 1 minute, the temperature was decreased to 50 ° C. at a temperature decrease rate of 50 ° C./min.
Thereafter, the temperature was held at 50 ° C. for 1 minute, and then the temperature was raised at 5 ° C./min. The fractional peak of the maximum peak of the obtained melting endothermic curve was rounded off to the Tm (melting point). For those with multiple peaks, the peak on the high temperature side was adopted.
In addition, Tm of indium (In) measured at a temperature decrease rate of 5 ° C./min and a temperature increase rate using this measuring instrument was 156.6 ° C.

(5) Density of polyethylene (unit: g / cm ³ )
The measurement was performed according to JIS-K7112, Method A (submersion method in water).

(6) Haze of film (unit:%)
It measured according to JIS-K7136.

(8) Friction coefficient of film μs, μk (unit:-)
Under a room temperature of 23 ° C. and a humidity of 50%, the measurement surfaces of two film samples of MD100 mm × TD75 mm are overlapped, a weight of 200 g is placed on an installation area of 63.5 mm × 63.5 mm, and TOYOSEKI FRICTION TESTER TR-2 Measurement was performed using a mold at a moving speed of 15 cm / min.

(9) Fish eye of film (pieces / m ² )
The number of fish eyes of 100 μm or more was measured using a film defect inspection apparatus MuiKen manufactured by NIRECO Co., Ltd. installed in a film casting machine.
Camera: One-dimensional CCD, 8,192 pixels Scan rate: Maximum of about 0.06 msec / line (160 MHz)
Resolution: 50μm / pixel

Polypropylene used (A)
(A1): Propylene content = 96.0% by mass, ethylene content = 4.0% by mass, MFR = 6.2 g / 10 min, melting point = 142 ° C., CXS content = 2.9% by mass Propylene / ethylene random copolymer (A2): propylene content = 94.4% by mass, ethylene content = 5.6% by mass, MFR = 1.4 g / 10 min, melting point = 133 ° C., CXS content = 5 0.0% by mass of crystalline propylene / ethylene random copolymer (A3): MFR = 7.8 g / 10 min, melting point = 165 ° C., CXS content = 0.8% by mass of propylene homopolymer (A4): MFR = 0.5 g / 10 min, melting point = 165 ° C., CXS content = 0.4 mass% propylene homopolymer (A5): propylene content = 90.7 mass%, ethylene content = 2.5 mass %, Butene content = 6 0.8% by mass, MFR = 3.5 g / 10 min, melting point = 132 ° C., CXS content = 2.5% by mass crystalline propylene / ethylene / butene random copolymer

Used polyethylene (B)
(B1) High density polyethylene E3100 (density = 0.952 g / cm3, MFR = 1.0 g / 10 min) manufactured by Keiyo Polyethylene Co., Ltd.
(B2) Sumitomo Chemical Co., Ltd. linear low density polyethylene Sumikacene α CS8051 (ethylene / 1-hexene copolymer, density = 0.940 g / cm 3, MFR = 2.2 g / 10 min, melting point = 127 ° C. )
(B3) Sumitomo Chemical Co., Ltd. linear low density polyethylene Sumikacene E FV102 (ethylene / 1-hexene copolymer, density = 0.926 g / cm3, MFR = 0.73 g / 10 min, melting point = 125 ° C. )
(B4) Low density polyethylene Sumikacene F218-0 manufactured by Sumitomo Chemical Co., Ltd. (density = 0.919 g / cm 3, MFR = 1.0 g / 10 min, melting point = 109 ° C.)
(B5) Sumitomo Chemical Co., Ltd. linear low density polyethylene Sumikacene E FV103 (ethylene / 1-hexene copolymer, density = 0.905 g / cm3, MFR = 1.0 g / 10 min, melting point = 113 ° C. )
(B6) High-density polyethylene G2500 (density = 0.916 g / cm 3, MFR = 5.4 g / 10 min) manufactured by Keiyo Polyethylene Co., Ltd.
(B7) High-density polyethylene G1900 (density = 0.955 g / cm3, MFR = 16 g / 10 minutes) manufactured by Keiyo Polyethylene Co., Ltd.
(B8) High density polyethylene Hi-Zex 7000F manufactured by Prime Polymer Co., Ltd. (density = 0.950 g / cm 3, MFR = 0.05 g / 10 min)
(B9) Linear low density polyethylene Sumikacene E FV401 (ethylene / 1-hexene copolymer, density = 0.905 g / cm 3, MFR = 3.8 g / 10 min, melting point = 113 ° C., manufactured by Sumitomo Chemical Co., Ltd. )
(B10) Ultra Low Density Polyethylene Tafmer A0550S (ethylene / butene copolymer, density = 0.860 g / cm 3, MFR = 0.6 g / 10 min, melting point <50 ° C.) manufactured by Mitsui Chemicals, Inc.

Masterbatch impregnated with the organic peroxide used (C)
(C1) Propylene content = 93.3% by mass, ethylene content = 2.2% by mass, butene content = 4.5% by mass, MFR = 7.0 g / 10 min, melting point = 140 ° C., CXS content = After 1.7% by mass of crystalline propylene / ethylene / butene random copolymer is sufficiently cooled with liquid nitrogen, it is pulverized by continuously introducing it into an impeller mill, passed through a filter and classified. To obtain a powdery polyolefin having a particle diameter D ₅₀ = 400 μm. Perhexa 25B (manufactured by NOF Corporation, chemical name: 2,5-dimethyl-2,5-di (t-butylperoxy) Polyolefin masterbatch impregnated with 8% by weight of hexane)

[Example 1]
A master batch (C1) in which 80% by mass of crystalline polypropylene (A1), 20% by mass of polyethylene (B1), and 100 parts by mass of (A1) and (B1) are impregnated with an organic peroxide. 31 parts by mass, calcium stearate (manufactured by Kyodo Pharmaceutical Co., Ltd.) 0.05 parts by mass, Irganox 1010 (manufactured by Ciba Specialty Chemicals) 0.05 part by mass, Irganox 1076 (manufactured by Ciba Specialty Chemicals) 0.01 Mass parts were added, mixed for 3 minutes with a Henschel mixer, and then melt-kneaded at 220 ° C. to obtain pellets. The obtained pellet had an MFR of 12 g / 10 min and an SR of 1.06.

[Film formation]
A T-die was attached to a 50 mmφ extruder, and the obtained pellets were melt-kneaded at a temperature of 240 ° C. for extrusion. The melt-extruded resin was temperature-controlled at 40 ° C. and cooled and solidified with a cooling roll rotating at 18 m / min to obtain a film having a thickness of 30 μm. Table 1 shows the physical properties of the obtained film. The obtained film was a film having high haze, excellent slipperiness, and less fish eyes.

[Example 2]
In Example 1, pellets were prepared according to Example 1 except that the amount of crystalline polypropylene (A1) was changed to 70% by mass and the amount of polyethylene (B1) was changed to 30% by mass to obtain a film. The obtained pellet had an MFR of 8.8 g / 10 min and an SR of 1.18, and the obtained film was a film having high haze, excellent slipperiness and less fish eyes.

[Example 3]
In Example 1, the crystalline polypropylene (A1) was changed to (A2), and the amount of the master batch (C1) impregnated with the organic peroxide was changed to 0.45 parts by mass in accordance with Example 1. The pellet was made and the film was obtained. The obtained pellet had an MFR of 6.4 g / 10 min and an SR of 1.10, and the obtained film was a film having high haze, excellent slipperiness and little fish eyes.

[Example 4]
In Example 1, except that the crystalline polypropylene (A1) was changed to (A3), pellets were prepared according to Example 1 to obtain a film. The obtained pellet had an MFR of 15 g / 10 min and an SR of 1.08, and the obtained film was a film having high haze, excellent slipperiness and little fish eyes.

[Example 5]
In Example 1, except that the crystalline polypropylene (A1) was changed to (A4), pellets were prepared according to Example 1 to obtain a film. The obtained pellet had an MFR of 7.0 g / 10 min and an SR of 1.10, and the obtained film was a film having high haze, excellent slipperiness and little fish eyes.

[Example 6]
In Example 1, pellets were prepared according to Example 1 except that polyethylene (B1) was changed to (B2) and the amount of master batch (C1) impregnated with organic peroxide was changed to 0.28 parts by mass. A film was obtained. The obtained pellet had an MFR of 9.8 g / 10 min and an SR of 1.06, and the obtained film was a film having high haze, excellent slipperiness and less fish eyes.

[Example 7]
In Example 1, pellets were prepared according to Example 1 except that polyethylene (B1) was changed to (B3) and the amount of the master batch (C1) impregnated with organic peroxide was changed to 0.45 parts by mass. A film was obtained. The obtained pellet had an MFR of 17 g / 10 min and an SR of 1.11. The obtained film was a film having high haze, excellent slipperiness and less fish eyes.

[Example 8]
In Example 1, polyethylene (B1) was changed to (B3), the blending amount was changed to 30% by mass, and the blending amount of the master batch impregnated with the organic peroxide (C1) was changed to 0.45 parts by mass. According to Example 1, pellets were prepared to obtain a film. The obtained pellet had an MFR of 11 g / 10 min and an SR of 1.27, and the obtained film was a film having high haze, excellent slipperiness and less fish eyes.

[Example 9]
In Example 1, pellets were prepared according to Example 1 except that the crystalline polypropylene (A1) was changed to (A3) and the polyethylene (B1) was changed to (B3) to obtain a film. The obtained pellet had an MFR of 17 g / 10 min and an SR of 1.10. The obtained film was a film having high haze, excellent slipperiness and little fish eyes.

[Example 10]
In Example 1, pellets were prepared according to Example 1 except that polyethylene (B1) was changed to (B4) and the amount of master batch (C1) impregnated with organic peroxide was changed to 0.28 parts by mass. A film was obtained. The obtained pellet had an MFR of 16 g / 10 min and an SR of 1.29, and the obtained film was a film having high haze and excellent sliding and blocking resistance.

[Example 11]
In Example 1, the crystalline polypropylene (A1) was changed to (A4), the amount of the master batch (C1) impregnated with the organic peroxide was changed to 0.80 parts by mass, and Elca was used as a fatty acid amide compound. Except adding 0.05 mass part of acid amides, the pellet was created according to Example 1 and the film was obtained. The obtained pellet had an MFR of 7.0 g / 10 min and an SR of 1.10, and the obtained film was a film having high haze, excellent slipperiness and little fish eyes.

[Example 12]
In Example 1, the crystalline polypropylene (A1) was changed to (A4), the amount of the master batch (C1) impregnated with the organic peroxide was changed to 0.80 parts by mass, and Elca was used as a fatty acid amide compound. Except that 0.1 part by mass of acid amide was added, pellets were prepared according to Example 1 to obtain a film. The obtained pellet had an MFR of 8.0 g / 10 min and an SR of 1.09, and the obtained film was a film having high haze, excellent slipperiness and little fish eyes.

[Example 13]
In Example 1, the crystalline polypropylene (A1) was changed to (A4), the amount of the master batch (C1) impregnated with the organic peroxide was changed to 0.80 parts by mass, and olein was used as the fatty acid amide compound. Except that 0.1 part by mass of acid amide was added, pellets were prepared according to Example 1 to obtain a film. The obtained pellet had an MFR of 7.5 g / 10 min and an SR of 1.08, and the obtained film was a film having high haze, excellent slipperiness and little fish eyes.

[Example 14]
In Example 1, the crystalline polypropylene (A1) was changed to (A4), the amount of the master batch (C1) impregnated with the organic peroxide was changed to 0.80 parts by mass, and behenine as a fatty acid amide compound Except that 0.1 part by mass of acid amide was added, pellets were prepared according to Example 1 to obtain a film. The obtained pellet had an MFR of 8.2 g / 10 min and an SR of 1.08, and the obtained film was a film having high haze, excellent slipperiness and less fish eyes.

[Example 15]
In Example 1, the crystalline polypropylene (A1) was changed to (A2), the amount of the master batch (C1) impregnated with the organic peroxide was changed to 0.80 parts by mass, and Elca was used as a fatty acid amide compound. Except that 0.1 part by mass of acid amide was added, pellets were prepared according to Example 1 to obtain a film. The obtained pellet had an MFR of 10.7 g / 10 min and an SR of 1.08, and the obtained film was a film having high haze, excellent slipperiness and little fish eyes.

[Example 16]
In Example 1, the crystalline polypropylene (A1) was changed to (A5), the amount of the master batch (C1) impregnated with the organic peroxide was changed to 0.80 parts by mass, and Elca was used as a fatty acid amide compound. Except that 0.1 part by mass of acid amide was added, pellets were prepared according to Example 1 to obtain a film. The obtained pellet had an MFR of 15.4 g / 10 min and an SR of 1.05, and the obtained film was a film having high haze, excellent slipperiness and little fish eyes.

[Example 17]
In Example 1, crystalline polypropylene (A1) was changed to (A5), polyethylene (B1) was changed to (B5), and the amount of master batch (C1) impregnated with organic peroxide was 0.80. A pellet was prepared according to Example 1 except that 0.1 part by mass of erucic acid amide was added as a fatty acid amide compound, and a film was obtained. The obtained pellet had an MFR of 7.7 g / 10 min and an SR of 1.05, and the obtained film was a film having high haze, excellent slipperiness and little fish eyes.

[Comparative Example 1]
In Example 1, the compounding amount of the crystalline polypropylene (A1) is 60% by mass, the compounding amount of the polyethylene (B1) is 40% by mass, and the compounding amount of the master batch (C1) impregnated with the organic peroxide is 0.00. Except having changed to 45 mass parts, the pellet was created according to Example 1 and the film was obtained. The obtained pellet had an MFR of 7.0 g / 10 min and an SR of 1.24, and the resulting film had numerous holes.

[Comparative Example 2]
In Example 1, except that the blending amount of the master batch (C1) impregnated with the organic peroxide was changed to 0.04 parts by mass, pellets were prepared according to Example 1 to obtain a film. The obtained pellet had an MFR of 6.5 g / 10 min and an SR of 1.22, and the obtained film did not sufficiently increase haze.

[Comparative Example 3]
In Example 1, except that polyethylene (B1) was changed to (B6), pellets were prepared according to Example 1 to obtain a film. The obtained pellet had an MFR of 18 g / 10 min and an SR of 1.15, and the resulting film did not sufficiently increase haze.

[Comparative Example 4]
In Example 1, except that polyethylene (B1) was changed to (B7), pellets were prepared according to Example 1 to obtain a film. The obtained pellet had an MFR of 20 g / 10 min and an SR of 2.29. The obtained film had a low haze, a lot of fish eyes, and a poor appearance.

[Comparative Example 5]
In Example 1, except that the polyethylene (B1) was changed to (B8) and the compounding amount of the master batch (C1) impregnated with the organic peroxide was changed to 0.35 parts by mass, the pellets according to Example 1 Made a film. The obtained pellet had an MFR of 15 g / 10 min and an SR of 1.14. The number of fish eyes detected by the defect detector was relatively large, and very large fish eyes were frequently generated.

[Comparative Example 6]
In Example 1, except that the blending amount of the crystalline polypropylene (A1) was changed to 100% by mass, pellets were prepared according to Example 1 to obtain a film. The obtained pellet had an MFR of 29 g / 10 min and an SR of 1.00, and the resulting film had low haze and poor sliding properties.

[Comparative Example 7]
Pellet blending was carried out using a 80% by mass pellet obtained in Comparative Example 6 and a 20% by mass polyethylene (B1) tumble mixer to obtain a film. The obtained film had insufficient haze and had many fish eyes.

[Comparative Example 8]
In Example 1, except that polyethylene (B1) was changed to (B3) and the blending amount of the master batch (C1) impregnated with organic peroxide was changed to 0.04 parts by mass, pellets were obtained in accordance with Example 1. Made a film. The obtained pellet had an MFR of 6.2 g / 10 min and an SR of 1.29, and the resulting film did not have a sufficiently high haze.

[Comparative Example 9]
In Example 1, except that polyethylene (B1) was changed to (B9), pellets were prepared according to Example 1 to obtain a film. The obtained pellet had an MFR of 15 g / 10 min and an SR of 1.84. The resulting film had low haze and poor slipperiness.

[Comparative Example 10]
In Example 1, polyethylene (B1) was changed to (B3), the blending amount was changed to 40% by mass, and the blending amount of the master batch (C1) impregnated with the organic peroxide was changed to 0.45 parts by mass. According to Example 1, pellets were prepared to obtain a film. The obtained pellet had an MFR of 6.0 g / 10 min and an SR of 1.43, and although the obtained film had high haze, it had many fish eyes and had numerous holes in the film.

[Comparative Example 11]
In Example 1, the amount of the master batch (C1) in which the crystalline polypropylene (A1) is changed to (A4) and the polyethylene (B1) is changed to (B10) and impregnated with an organic peroxide is 0.80 parts by mass. A pellet was prepared according to Example 1 except that 0.1 part by mass of erucic acid amide was added as a fatty acid amide compound, and a film was obtained. The obtained pellet had an MFR of 15 g / 10 min and an SR of 1.84. The resulting film had low haze and poor slipperiness.

[Comparative Example 12]
In Example 1, the crystalline polypropylene (A1) was added to (A4) and 0.064 parts by mass of perhexa 25B was added as an organic peroxide without using a masterbatch (C1) impregnated with an organic peroxide. Made a pellet according to Example 1 to obtain a film. The obtained pellet had an MFR of 3.3 g / 10 min and an SR of 1.53, and the obtained film had a low haze, an extremely large fish eye, and an inferior appearance.

[Comparative Example 13]
In Example 1, 0.080 parts by mass of perhexa 25B was added as an organic peroxide without using a master batch (C1) impregnated with an organic peroxide in crystalline polypropylene (A1) (A4), Pellets were prepared according to Example 1 except that 0.1 part by mass of erucic acid amide was added as a fatty acid amide compound to obtain a film. The obtained pellet had an MFR of 6.9 g / 10 min and an SR of 1.16, and the obtained film was a film having a low haze, an extremely large number of fish eyes, and an inferior appearance.

  The polypropylene resin composition of the present invention can be used for sheets, films for food, industrial use, agriculture and the like. By forming a film using this composition, a film having a rough surface, high haze, excellent slipperiness, and less appearance defects such as fish eyes can be obtained without using an inorganic material such as ABA. It is done.

Claims (7)

A propylene homopolymer, or a propylene random copolymer comprising propylene and one or more comonomers and having a comonomer content of 20% by mass or less (provided that the total mass of the propylene random copolymer is 100% by mass). And polypropylene (component (A)),
Density of less than 0.900 g / cm ³ or more 0.970 g / cm ^3, polyethylene 190 ° C., the melt flow rate measured under a 2.16kg load is 0.5 to 3 g / 10 min (component (B ))When,
A master batch (component (C)) impregnated with 1 to 30% by mass of organic peroxide in powdered polyolefin (provided that the total amount of organic peroxide and powdered polyolefin is 100% by mass). A polypropylene resin composition obtained by melt-kneading a mixture containing,
The mixture is
When the total amount of the component (A) and the component (B) is 100% by mass, the content of the component (A) is 65 to 95% by mass, and the content of the component (B) is 5 to 35% by mass. And
And it is a mixture containing 0.005-0.5 mass part said organic peroxide with respect to a total of 100 mass parts of a component (A) and a component (B), The polypropylene resin composition characterized by the above-mentioned. . The polypropylene resin composition according to claim 1, wherein the component (B) is polyethylene having a density of 0.900 g / cm ³ or more and less than 0.945 g / cm ³ . Component (B) polypropylene resin composition according to claim 1, characterized in that it is polyethylene having a density of less than 0.945 g / cm ³ or more 0.970 g / cm ^3.   It is a polypropylene whose melt flow rate of the component (A) measured under 230 degreeC and a 2.16kg load is 0.1-10 g / 10min, The any one of Claims 1-3 characterized by the above-mentioned. Polypropylene resin composition.   The said mixture contains 0.01-0.5 mass part of fatty-acid amide compounds further with respect to a total of 100 mass parts of a component (A) and a component (B), The characterized by the above-mentioned. The polypropylene resin composition in any one.   The film which has 1 layer or more which consists of a polypropylene resin composition in any one of Claims 1-5.   The film according to claim 6, which is an unstretched film.