JP2010150328A - Polypropylene-based resin composition, and film comprised of the same - Google Patents

Abstract

The present invention provides a polypropylene resin composition having a haze and gloss suitable for a matte film having a moist and high-quality appearance, and having an excellent balance between blocking resistance and impact resistance.
A polymer component (component A) whose main component is a structural unit derived from propylene and a propylene-ethylene copolymer component (component) whose content of the structural unit derived from ethylene is 20 to 48% by weight. B) 10 to 40% by weight, the intrinsic viscosity of component B is 2.0 dL / g or more, and the ratio of the intrinsic viscosity of component A to the intrinsic viscosity of component B is 1.3 <[η] B / [η A composition containing 75 to 99% by weight of a propylene copolymer (I) with A ≦ 2.5 and an ethylene polymer (II) having a melt flow rate of 0.1 to 3.0 g / 10 min. A polypropylene resin composition obtained by melting and kneading a product and having a melt flow rate of 5.0 g / 10 min or more.
[Selection figure] None

Description

The present invention relates to a polypropylene resin composition. More specifically, a polypropylene resin composition having a haze and gloss suitable for a matte film having a moist and high-quality appearance, and having an excellent balance between blocking resistance and impact resistance, and a film comprising the same It is about.

Polypropylene is widely used in the field of packaging materials such as food packaging and fiber packaging because it is excellent in rigidity, heat resistance and packaging suitability. In recent years, a matte film having a moist appearance with polypropylene as a main component has been developed, and a matte film having a high-class feeling and excellent in impact resistance has been demanded.

JP-A-5-448 discloses a crystalline propylene-ethylene block copolymer having a specific property, an organic peroxide having a decomposition temperature of 60 ° C. or more with a half-life of 10 hours, and an ethylene content. A composition comprising polyethylene or a copolymer of ethylene and other α-olefin and / or radically polymerizable polar unsaturated compound that is 50% or more is described, and the film comprising the composition exhibits translucency It is described that the film has a markedly increased degree of brightness.

Japanese Patent Application Laid-Open No. 2003-213069 discloses a propylene copolymer having specific properties, a propylene polymer having a melt flow rate of 5 g / 10 min or more, and a melt flow rate of 0.1 to 2 g / 10 min. A polypropylene resin resin composition comprising a high-pressure low-density polyethylene and / or a high-density polyethylene having a density of 0.940 g / cm ³ or more is described, and the film comprising the composition has a moist and high-quality feeling. It describes that it has a haze suitable for a matte film having a sensation of appearance, a good appearance, and excellent impact strength.

JP-A-5-448 JP 2003-213069 A

However, further improvement is desired in the balance between appearance and impact resistance.
The object of the present invention is to provide a polypropylene resin composition having a haze and gloss suitable for a matte film having a moist and high-class appearance, and having an excellent balance between blocking resistance and impact resistance. There is to do.

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 relates to propylene having a polymer component (component A) of 60 to 90% by weight whose main component is a structural unit derived from propylene and a content of the structural unit derived from ethylene of 20 to 48% by weight. -Comprising 10 to 40% by weight of an ethylene copolymer component (component B) (provided that the sum of the content of component A and the content of component B is 100% by weight), and the intrinsic viscosity of component B ([η B) is 2.0 dL / g or more, and the ratio of the intrinsic viscosity of component A ([η] A) to the intrinsic viscosity of component B ([η] B / [η] A) is 1.3 <[η ] B / [η] A ≦ 2.5 propylene copolymer (I) 75 to 99% by weight, and ethylene polymer (II) having a melt flow rate of 0.1 to 3.0 g / 10 min Composition containing 1 to 25% by weight (provided that the content of propylene copolymer (I) and ethylene The present invention relates to a polypropylene resin composition obtained by melt-kneading a polymer (II) with a total content of 100% by weight) and having a melt flow rate of 5.0 g / 10 min or more. .

According to the present invention, there is obtained a polypropylene resin composition having a haze and gloss suitable for a matte film having a moist and high-quality appearance, and having an excellent balance between blocking resistance and impact resistance. be able to.

The polypropylene resin composition of the present invention is a propylene copolymer (I) comprising a polymer component (component A) whose main component is a structural unit derived from propylene and a propylene-ethylene copolymer component (component B). And a polypropylene resin composition obtained by melt-kneading a composition containing ethylene polymer (II).

The content of the structural unit derived from propylene in the component A of the propylene-based copolymer (I) used in the present invention is preferably 90 to 100% by weight, and more preferably 95 to 100% by weight.

Component A of the propylene-based copolymer (I) used in the present invention can be copolymerized with ethylene and / or an α-olefin having 4 to 12 carbon atoms, if necessary, and ethylene and / or carbon. The content of the structural unit derived from the α-olefin of several 4 to 12 is preferably 10% by weight or less, and more preferably 5% by weight or less. Examples of the α-olefin having 4 to 12 carbon atoms include 1-butene, 1-hexene, 1-octene and the like, and preferably 1-butene.

The content of the structural unit derived from ethylene in the propylene-ethylene copolymer component (component B) in the propylene-based copolymer (I) used in the present invention is 20 to 48% by weight, preferably 25 to 48%. % By weight (provided that the weight of component B is 100% by weight). If it is less than 20% by weight, the matting effect may be insufficient (low haze and gloss is high), and if it exceeds 48% by weight, impact resistance may be deteriorated.

The content of the propylene-ethylene copolymer component (component B) in the propylene-based copolymer (I) used in the present invention is 10 to 40% by weight (provided that the total of component A and component B is 100% by weight). And). Preferably, the content of the propylene-ethylene copolymer component (component B) is 10 to 30% by weight. When the content of the propylene-ethylene copolymer component (component B) is less than 10% by weight, the impact resistance may be low, and when it exceeds 40% by weight, the blocking resistance may be deteriorated.

The intrinsic viscosity ([η] B) of the propylene-ethylene copolymer component (component B) in the propylene-based copolymer (I) used in the present invention is 2.0 dL / g or more, preferably 2. It is 0-4.5 dL / g, More preferably, it is 2.2-4.0 dL / g. When the intrinsic viscosity ([η] B) of the propylene-ethylene copolymer component (component B) is less than 2.0 dL / g, the matting effect may be insufficient (low haze and high gloss). .

Polymer component having propylene-ethylene copolymer component (component B) intrinsic viscosity ([η] B) in propylene-based copolymer (I) used in the present invention and a structural unit derived from propylene as main components ( The ratio ([η] B / [η] A) of the intrinsic viscosity ([η] A) of component A) is 1.3 <[η] B / [η] A ≦ 2.5, preferably 1 4 ≦ [η] B / [η] A ≦ 2.4. When [η] B / [η] A is 1.3 or less, the matting effect may be insufficient (has low haze and gloss is high). It may occur and the appearance may deteriorate.

Examples of the method for producing the propylene-based copolymer (I) used in the present invention include a method of polymerizing propylene, ethylene, or the like as a raw material using a Ziegler-Natta catalyst or a metallocene catalyst.
As a polymerization method of the propylene copolymer (I), a method of polymerizing in an inert solvent such as hexane, heptane, toluene, xylene, a method of polymerizing in liquid propylene or ethylene, a gas in propylene or ethylene And a method of polymerizing in a gas phase state or a combination of these.
As a method for producing the propylene-based copolymer (I), from the viewpoint of productivity, it is preferable that the structural unit derived from propylene is a main component in the first step substantially in the absence of an inert solvent. This is a method for producing a propylene-ethylene copolymer component (component B) by producing a coalescence component (component A) and then polymerizing propylene and ethylene in the gas phase in the second step.
As a method of adjusting the intrinsic viscosity and ethylene content of (component A) and (component B) of propylene-based copolymer (I), molecular weight regulators such as hydrogen gas and metal compounds and appropriate amounts are used in each step during polymerization. And a method of adjusting the temperature and pressure during polymerization.
The proportions of (component A) and (component B) in the propylene copolymer (I) are determined based on the polymerization time during the production of the propylene copolymer (I), the size of the polymerization tank, and the retention of the polymer in the polymerization tank. It can be controlled by the amount, polymerization temperature, polymerization pressure and the like. If necessary, drying may be performed at a temperature not higher than the temperature at which the polypropylene melts in order to remove the residual solvent of the polypropylene, the ultra-low molecular weight oligomer by-produced during the production, and the like. Examples of the drying method include the methods described in JP-A Nos. 55-75410 and 2565753.

The ethylene-based copolymer (II) used in the present invention is an ethylene homopolymer or an ethylene-α-olefin copolymer containing ethylene as a main component. The ethylene-α-olefin copolymer is a copolymer obtained by copolymerizing ethylene and an α-olefin having 3 to 20 carbon atoms. Examples of the α-olefin having 3 to 20 carbon atoms include propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-hexedene and 1-eicosene. 4-methyl-1-pentene, 4-methyl-1-hexene and the like, and these may be used alone or in combination of at least two kinds.
The ethylene-α-olefin copolymer is preferably an ethylene-propylene copolymer, an ethylene-1-butene copolymer, an ethylene-1-hexene copolymer, an ethylene-1-octene copolymer, a low pressure method low density. Examples include polyethylene. These may be used alone or in combination of at least two.

The ethylene copolymer (II) used in the present invention is preferably a high pressure method low density polyethylene. As a method for producing a high-pressure method low-density polyethylene, for example, in a tank reactor or a tubular reactor, in the presence of a radical generator, under conditions of a polymerization pressure of 140 to 300 MPa and a polymerization temperature of 200 to 300 ° C, A method of polymerizing ethylene can be mentioned.

The density of the ethylene-based copolymer (II) used in the present invention is not particularly limited, but is 0.900 g / cm ³ or more. If the density of the ethylene-based copolymer (II) is less than 0.900 g / cm ³ , the matting effect may be insufficient (low haze and high gloss). The density of the ethylene copolymer (II) is preferably 0.990 g / cm ³ or less.

The melt flow rate of the ethylene-based copolymer (II) used in the present invention is 0.1 to 3.0 g / 10 minutes, preferably 0.2 to 3.0 g / 10 minutes, more preferably 0.2 to 2.0 g / 10 min. When the melt flow rate of the ethylene copolymer (II) is less than 0.1 g / 10 minutes, the miscibility with the propylene copolymer (I) may deteriorate, exceeding 3.0 g / 10 minutes. In some cases, the matte effect is insufficient (low haze and high gloss), and impact resistance may be low.

Examples of a method for adjusting the density and melt flow rate of the ethylene copolymer (II) used in the present invention include a method using hydrogen and / or a hydrocarbon such as methane and ethane as a molecular weight regulator, an α-olefin Examples thereof include a method for adjusting the content.

The polypropylene resin composition of the present invention contains 75 to 99% by weight of the propylene copolymer (I) and 1 to 25% by weight of the ethylene polymer (II) (provided that the propylene copolymer ( I) and the total weight of the ethylene polymer (II) are 100% by weight). It preferably contains 77 to 98% by weight of propylene-based copolymer (I) and 2 to 23% by weight of ethylene-based polymer (II), and 80 to 95% by weight of propylene-based copolymer (I), More preferably, it contains 5 to 20% by weight of an ethylene polymer (II). When the propylene copolymer (I) is less than 75% by weight (that is, when the ethylene polymer (II) exceeds 25% by weight), the impact resistance of the resulting film may be deteriorated. When the copolymer (I) exceeds 99% by weight (that is, when the ethylene polymer (II) is less than 1% by weight), the matte effect is insufficient (low haze and high gloss). )Sometimes.

In the polypropylene resin composition of the present invention, a phenolic antioxidant or a phosphorus resin is used for the purpose of suppressing the oxidative deterioration of the resin composition or the film and improving the matting effect and impact resistance when the film is produced. You may contain antioxidant.

Examples of the phenolic antioxidant include 2,6-di-t-butyl-4-methylphenol, tetrakis [methylene-, which is a hindered phenolic antioxidant or a hindered phenolic antioxidant. 3 (3 ′, 5′-di-tert-butyl-4-hydroxyphenyl) propionate] methane, octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 3,9-bis [2- {3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy} -1,1-dimethylethyl] -2,4,8,10-tetraoxaspiro [5 · 5] Undecane, 1,3,5-tris 2 [3 (3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxy] ethyl isocyanate, 1,3,5-to Limethyl-2,4,6-tris (3,5-di-tert-butyl-4-hydroxybenzyl) benzene, tris (3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate, 1,3 , 5-Tris (4-t-butyl-3-hydroxy-2,6-dimethylbenzyl) isocyanurate, pentaerythrityl-tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate ], Triethylene glycol-N-bis-3- (3-t-butyl-5-methyl-4-hydroxyphenyl) propionate, 1,6-hexanediol bis [3- (3,5-di-t-butyl) -4-hydroxyphenyl) propionate], 2,2-thiobis-diethylenebis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate ], 2,2′-methylene-bis- (4-methyl-6-tert-butylphenol), 2,2′-methylene-bis- (4-ethyl-6-tert-butylphenol), 2,2′-methylene -Bis- (4,6-di-t-butylphenol), 2,2'-ethylidene-bis- (4,6-di-t-butylphenol) (cheminox 1129), 2,2'-butylidene-bis- ( 4-methyl-6-t-butylphenol), 4,4'-butylidenebis (3-methyl-6-t-butylphenol), 2-t-butyl-6- (3-t-butyl-2-hydroxy-5- Methylbenzyl) -4-methylphenyl acrylate, 2,4-di-t-amyl-6- (1- (3,5-di-t-amyl-2-hydroxyphenyl) ethyl) phenyl acrylate, representative of vitamin E Α-tocopherols and the like.

Examples of the phosphorus antioxidant include triphenyl phosphite, tris (nonylphenyl) phosphite, tris (2,4-di-t-butylphenyl) phosphite, trilauryl phosphite, and trioctadecyl phosphite. , Distearyl pentaerythritol diphosphite, diisodecyl pentaerythritol diphosphite, bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite, bis (2,4-di-tert-butyl-6-methyl) Phenyl) pentaerythritol diphosphite, bis (2,6-di-t-butyl-4-methylphenyl) pentaerythritol diphosphite, bis (2,4,6-tri-t-butylphenyl) pentaerythritol diphosphite, Tristearyl sorbitol triphospha And tetrakis (2,4-di-t-butylphenyl) -4,4'-diphenylenediphosphonite, 2,2'-methylenebis (4,6-di-t-butylphenyl) -2-ethylhexylphos Phyto, 2,2′-ethylidenebis (4,6-di-t-butylphenyl) fluorophosphite, bis (2,4-di-t-butyl-6-methylphenyl) ethyl phosphite, bis (2, 4-di-t-butyl-6-methylphenyl) methyl phosphite, 2- (2,4,6-tri-t-butylphenyl) -5-ethyl-5-butyl-1,3,2-oxaphospho Linnan, 2,2 ',
2 ″ -nitrilo [triethyl-tris (3,3 ′, 5,5′-tetra-t-butyl-1,1′-biphenyl-2,2′-diyl) phosphite, 2,4,8,10 -Tetra-t-butyl-6- [3- (3-methyl-4-hydroxy-5-t-butylphenyl) propoxy] dibenzo [d, f] [1,3,2] dioxaphosphine, and A mixture of at least two of these may be used.

The polypropylene resin composition of the present invention may contain an organic peroxide for the purpose of improving the matting effect and processability.

Examples of the organic peroxide include conventionally known organic peroxides. For example, an organic peroxide having a decomposition temperature of 120 ° C. or higher at which the half-life is 1 minute is preferable. Examples of the organic peroxide having a decomposition temperature of 120 ° C. or more with a half-life of 1 minute include 1,1-bis (t-butylperoxy) cyclohexane, 2,2-bis (4,4-di-). t-butylperoxycyclohexyl) propane, 1,1-bis (t-butylperoxy) cyclododecane, t-hexylperoxyisopropyl monocarbonate, t-butylperoxy-3,5,5-trimethylhexanoate, t-butylperoxylaurate, 2,5 dimethyl-2,5-di (benzoylperoxy) hexane, t-butylperoxyacetate, 2,2-bis (t-butylperoxy) butene, t-butylper Oxybenzoate, n-butyl-4,4-bis (t-beroxy) valerate, di-t-butylberoxyisophthalate, dicumy Peroxide, α-α′-bis (t-butylperoxy-m-isopropyl) benzene, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, 1,3-bis (t- Butylperoxydiisopropyl) benzene, t-butylcumyl peroxide, di-t-butyl peroxide, p-menthane hydroperoxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexyne-3 Etc.
An organic peroxide having a decomposition temperature of 150 ° C. or higher at which the half-life is 1 minute is more preferable.

The polypropylene resin composition of the present invention can be obtained by melt-kneading propylene copolymer (I) and ethylene polymer (II).

Said melt-kneading can be performed using a conventionally well-known method and apparatus. For example, a method in which propylene copolymer (I), ethylene polymer (II), and various additives are mixed using a mixing device such as a Henschel mixer, ribbon blender, or tumble mixer, and then melt kneaded; After obtaining a homogeneous mixture by continuously supplying the propylene-based copolymer (I), the ethylene-based polymer (II) and various additives at a certain ratio using a feeder, Examples thereof include a method of melt-kneading the mixture using a single-screw or twin-screw extruder, a Banbury mixer, a roll kneader, or the like.

The melt kneading temperature is preferably 180 ° C to 350 ° C. More preferably, it is 180 degreeC-320 degreeC, More preferably, it is 180 degreeC-300 degreeC.

The polypropylene resin composition of the present invention has a melt flow rate of 5.0 g / 10 min or more. When the melt flow rate of the polypropylene resin composition is less than 5.0 g / 10 min, the extrusion load during film processing increases, and the productivity of the film may be inferior. From the viewpoint of productivity, it is preferably 7.0 g / 10 min or more. From the viewpoint of fish eyes, the melt flow rate is preferably 15 g / 10 min or less.

The method for controlling the melt flow rate of the polypropylene resin composition of the present invention includes a method for adjusting the intrinsic viscosity of the propylene copolymer (I) and the ethylene polymer (II); the propylene copolymer (I). Of adjusting the temperature and kneading force at the time of melt-kneading between the ethylene-based polymer (II) and the ethylene polymer (II); The method of adjusting is mentioned.

You may add an additive and another resin to the polypropylene resin composition of this invention as needed. Examples of the additive include other antioxidants, ultraviolet absorbers, antistatic agents, lubricants, nucleating agents, pressure-sensitive adhesives, antifogging agents, and antiblocking agents. Examples of other resins include olefin resins and elastomers which are copolymers of ethylene and α-olefins, and even if these are produced with heterogeneous catalysts, homogeneous catalysts (for example, metallocenes). Catalysts etc.) may be used. Furthermore, elastomers, such as a styrene-type copolymer rubber which hydrogenated the styrene-butadiene-styrene copolymer and the styrene-isoprene-styrene copolymer, are mentioned.

The film of the present invention preferably has a thickness of 10 to 500 μm, and more preferably 10 to 100 μm.

The film of the present invention may be a single layer film or a multilayer film including at least one layer composed of the film of the present invention. The film of the present invention may be an unstretched film or a stretched film obtained by stretching the polypropylene film of the present invention. Preferably, it is an unstretched film.

The production method of the film of the present invention is not particularly limited. For example, a method of forming a film independently using a commonly used inflation method, T-die method, calendar method, or the like, or at least one layer of a multilayer film The method of forming a film is mentioned. 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.

The film of the present invention may be subjected to a surface treatment such as corona discharge treatment, flame treatment, plasma treatment, ozone treatment, etc., by a method usually employed industrially.

The application of the film of the present invention is not particularly limited, and examples thereof include packaging applications, and examples thereof include packaging applications such as foods, fibers and sundries. A matte film having a moist and high-quality appearance is preferable.

Hereinafter, although the present invention is explained using an example and a comparative example, the range of the present invention is not limited only to an example. The detailed description of the invention and the measured values of each item in the examples and comparative examples were measured by the following methods.
(1) Content of component A and component B of propylene-based copolymer (I) (unit:% by weight)
The content (P _A ) of component ( _A ) and the content (P _B ) of component B were determined from the material balance during polymerization of component (A) and component (B) of the propylene copolymer.
(2) Ethylene content of component B of propylene-based copolymer (I) (unit:% by weight)
The entire IR spectrum of the propylene-based copolymer was measured and determined according to the method relating to the block copolymer (ii) described on page 616 of the Polymer Handbook (1995, published by Kinokuniya Shoten). The ethylene content of component B was determined by 1).

E _B = (E _T −E _A × P _A ) / P _B Formula (1)

(However, E _T , E _A and E _B represent the ethylene content in the entire propylene copolymer (1), component A and component B, respectively, and P _A and P _B represent the contents of component A and component B, respectively. Is shown.)
(3) Intrinsic viscosity ([η], unit: dL / g)
The measurement was performed in 135 ° C. tetralin using an Ubbelohde viscometer.
(3-1) Intrinsic viscosities of component A and component B ([η] A, [η] B)
The intrinsic viscosity [η] A of component A sampled at the end of polymerization in the first step, the total intrinsic viscosity [η] T of the copolymer obtained after completion of the polymerization in the second step, and the content of component A ( The intrinsic viscosity [η] B of component B was calculated from the following equation (2) using the content of P _A ) and the content of component B (P _B ).

[Η] A × P _A / 100 + [η] B × P _B / 100 = [η] T Equation (2)

(4) Melt flow rate (MFR, unit: g / 10 minutes)
The melt flow rate of polypropylene was measured at a temperature of 230 ° C. and a load of 21.18 N according to JIS K7210. The melt flow rate of polyethylene was measured according to JIS K6730.
(5) Density (Unit: g / cm ³ )
The density of polyethylene was measured according to JIS K7112.
(6) Haze (Unit:%)
It measured according to JIS K7105.
(7) Gross (Unit:%)
It measured according to JIS K7105.
(8) Blocking resistance (unit: g / 100 cm ² )
Using 225 mm × 50 mm films, the films were overlapped, and the condition of 100 mm × 50 mm was adjusted at 60 ° C. for 3 hours under a load of 40 g / cm ² . Thereafter, the sample was left in an atmosphere of 23 ° C. and 50% humidity for 30 minutes or more, and the strength required for peeling the sample was measured at a peeling rate of 20 g / min using a Shimadzu blocking tester.
(9) Impact resistance (unit: kJ / m)
The film was placed in a thermostat set at −15 ° C., and the impact strength of the film was measured using a Toyo Seiki film impact tester using a hemispherical impact head having a diameter of 15 mm.

Example 1
Propylene homopolymer portion having an intrinsic viscosity of 2.3 dL / g was produced in the first step using a Ziegler-Natta type catalyst, and then the intrinsic viscosity was 3.6 dL / g and the ethylene content was 37 in the second step. A propylene-ethylene copolymer (BCPP1) was obtained by producing a copolymer part of propylene and ethylene by weight%. The content of the copolymer portion of propylene and ethylene was 16% by weight.
Sumicacene F102-0 (manufactured by Sumitomo Chemical Co., Ltd., density = 0.922 g / cm ³ , MFR = 0.4 g / m) as an ethylene polymer with respect to 95% by weight of the obtained propylene copolymer (BCPP1). 10 minutes) 5% by weight was uniformly mixed. With respect to 100 parts by weight of the mixture, 0.01 parts by weight of hydrotalcite (DHT4C, manufactured by Kyowa Chemical Industry Co., Ltd.), erucic acid amide (Nutron-S, manufactured by Nippon Seika Co., Ltd.) 0.10 parts by weight Part, Sumilizer GP (2,4,8,10-tetra-tert-butyl-6- [3- (3-methyl-4-hydroxy-5-tert-butylphenyl) propoxy] dibenzo [d, f] [1 , 3,2] dioxaphosphepine (Sumitomo Chemical Co., Ltd.) 0.075 parts by weight, Sumilizer GS (2,4-di-t-amyl-6- [1- (3,5-di-t) -Amyl-2-hydroxyphenyl) ethyl] phenyl acrylate, manufactured by Sumitomo Chemical Co., Ltd.) 0.075 parts by weight, 2,5-dimethyl-2,5-di (tertiarybutylperoxy) hexane as the organic peroxide Add 0.041 parts by weight Using a 40 mm single-screw extruder (VS40-28, manufactured by Tanabe Plastics Machine Co., Ltd., with full flight screw), melt-kneaded at 250 ° C., and MFR = 6.7 (g / 10 min) polypropylene system A resin composition was obtained.
The obtained polypropylene resin composition was melt-extruded at a resin temperature of 250 ° C. using a 50 mmT die film forming apparatus (V-50-F600 type film forming apparatus manufactured by Tanabe Plastics Co., Ltd., with a 400 mm wide T die). went. The melt-extruded product was cooled with a cooling roll through which cooling water of 50 ° C. was passed to obtain a film having a thickness of 30 μm. The properties of the obtained film are shown in Table 3.

Example 2
The propylene copolymer (BCPP1) is 90% by weight, the ethylene polymer is 10% by weight, and the amount of 2,5-dimethyl-2,5-di (tertiarybutylperoxy) hexane is 0.050%. A polypropylene resin composition with MFR = 7.2 (g / 10 min) was obtained in the same manner as in Example 1 except that the parts were changed to parts.
The obtained polypropylene resin composition was extruded in the same manner as in Example 1 to obtain a film. The properties of the obtained film are shown in Table 3.

Example 3
MFR was performed in the same manner as in Example 1 except that Sumikasen F218-0 (Sumitomo Chemical Co., Ltd., density = 0.919 g / cm ³ , MFR = 0.9 g / 10 min) was used as the ethylene polymer. = 7.0 (g / 10 min) was obtained.
The obtained polypropylene resin composition was extruded in the same manner as in Example 1 to obtain a film. The properties of the obtained film are shown in Table 3.

Example 4
By the same method as in Example 1 except that Sumikasen E FV103 (manufactured by Sumitomo Chemical Co., Ltd., density = 0.904 g / cm ³ , MFR = 1.3 g / 10 min) was used as the ethylene polymer, MFR = A polypropylene resin composition of 6.5 (g / 10 min) was obtained.
The obtained polypropylene resin composition was extruded in the same manner as in Example 1 to obtain a film. The properties of the obtained film are shown in Table 3.

Example 5
Propylene homopolymer portion having an intrinsic viscosity of 1.8 dL / g is produced in the first step using a Ziegler-Natta type catalyst, and then the intrinsic viscosity is 3.4 dL / g and the ethylene content is 30 in the second step. A propylene copolymer (BCPP2) was obtained by producing a copolymer part of propylene and ethylene by weight%. The content of the copolymer portion of propylene and ethylene was 22% by weight.
Sumicacene F102-0 (manufactured by Sumitomo Chemical Co., Ltd., density = 0.922 g / cm ³ , MFR = 0.4 g / m) as an ethylene polymer with respect to 90% by weight of the obtained propylene copolymer (BCPP2). 10 minutes) 10% by weight was uniformly mixed. With respect to 100 parts by weight of the mixture, 0.01 parts by weight of hydrotalcite (DHT4C, manufactured by Kyowa Chemical Industry Co., Ltd.), erucic acid amide (Nutron-S, manufactured by Nippon Seika Co., Ltd.) 0.10 parts by weight Part, Sumilizer GP (2,4,8,10-tetra-tert-butyl-6- [3- (3-methyl-4-hydroxy-5-tert-butylphenyl) propoxy] dibenzo [d, f] [1 , 3,2] dioxaphosphepine (Sumitomo Chemical Co., Ltd.) 0.075 parts by weight, Sumilizer GS (2,4-di-t-amyl-6- [1- (3,5-di-t) -Amyl-2-hydroxyphenyl) ethyl] phenyl acrylate, manufactured by Sumitomo Chemical Co., Ltd.) 0.075 parts by weight, 2,5-dimethyl-2,5-di (tertiarybutylperoxy) hexane as the organic peroxide Add 0.030 parts by weight Using a 40 mm single screw extruder (VS40-28 type, manufactured by Tanabe Plastics Machine Co., Ltd., with full flight screw), melt-kneaded at 250 ° C., and MFR = 6.5 (g / 10 min) polypropylene system A resin composition was obtained.
The obtained polypropylene resin composition was extruded in the same manner as in Example 1 to obtain a film. The properties of the obtained film are shown in Table 3.

Example 6
Propylene homopolymer portion having an intrinsic viscosity of 1.4 dL / g is produced in the first step using a Ziegler-Natta type catalyst, and then the intrinsic viscosity is 2.9 dL / g and the ethylene content is 40 in the second step. A propylene-ethylene copolymer (BCPP3) was obtained by producing a copolymer part of propylene and ethylene by weight%. The content of the copolymer portion of propylene and ethylene was 14% by weight.
Sumicacene F102-0 (Sumitomo Chemical Co., Ltd., density = 0.922 g / cm ³ , MFR = 0.4 g / m) as an ethylene polymer with respect to 95% by weight of the obtained propylene copolymer (BCPP3). 10 minutes) 5% by weight was uniformly mixed. With respect to 100 parts by weight of the mixture, 0.01 parts by weight of hydrotalcite (DHT4C, manufactured by Kyowa Chemical Industry Co., Ltd.), erucic acid amide (Nutron-S, manufactured by Nippon Seika Co., Ltd.) 0.10 parts by weight Part, Sumilizer GP (2,4,8,10-tetra-tert-butyl-6- [3- (3-methyl-4-hydroxy-5-tert-butylphenyl) propoxy] dibenzo [d, f] [1 , 3,2] dioxaphosphepine (Sumitomo Chemical Co., Ltd.) 0.075 parts by weight, Sumilizer GS (2,4-di-t-amyl-6- [1- (3,5-di-t) -Amyl-2-hydroxyphenyl) ethyl] phenyl acrylate, manufactured by Sumitomo Chemical Co., Ltd.) (0.075 parts by weight), 40 mm single screw extruder (VS40-28 type, Tanabe Plastics Machinery Co., Ltd., full flight screw) With) for Te, and melt-kneaded at 250 ° C., to obtain a polypropylene resin composition MFR = 7.9 (g / 10 min).
The obtained polypropylene resin composition was extruded in the same manner as in Example 1 to obtain a film. The properties of the obtained film are shown in Table 3.

Comparative Example 1
A polypropylene resin composition with MFR = 6.8 (g / 10 min) was prepared in the same manner as in Example 1 except that the propylene copolymer (BCPP1) was 100% by weight and no ethylene polymer was used. I got a thing.
The obtained polypropylene resin composition was extruded in the same manner as in Example 1 to obtain a film. The properties of the obtained film are shown in Table 3.

Comparative Example 2
Propylene copolymer (BCPP1) is 80% by weight, and ethylene polymer is Sumikasen F411-0 (Sumitomo Chemical Co., Ltd., density = 0.925 g / cm ³ , MFR = 4.8 g / 10 min) 20 In the same manner as in Example 1 except that the amount of 2,5-dimethyl-2,5-di (tertiarybutylperoxy) hexane was changed to 0.055 parts by weight, MFR = 7.3. A polypropylene resin composition (g / 10 min) was obtained.
The obtained polypropylene resin composition was extruded in the same manner as in Example 1 to obtain a film. The properties of the obtained film are shown in Table 3.

Comparative Example 3
Propylene homopolymer portion having an intrinsic viscosity of 2.8 dL / g was produced in the first step using a Ziegler-Natta type catalyst, and then in the second step, an intrinsic viscosity of 2.8 dL / g and an ethylene content of 36 A propylene copolymer (BCPP4) was obtained by producing a copolymer portion of propylene and ethylene by weight%. The content of the copolymer portion of propylene and ethylene was 21% by weight.
Sumicacene F218-0 (manufactured by Sumitomo Chemical Co., Ltd., density = 0.919 g / cm ³ , MFR = 0.9 g / m) as an ethylene polymer with respect to 95% by weight of the obtained propylene copolymer (BCPP4). 10 minutes) 5% by weight was uniformly mixed. With respect to 100 parts by weight of the mixture, 0.01 parts by weight of hydrotalcite (DHT4C, manufactured by Kyowa Chemical Industry Co., Ltd.), erucic acid amide (Nutron-S, manufactured by Nippon Seika Co., Ltd.) 0.10 parts by weight Part, Sumilizer GP (2,4,8,10-tetra-tert-butyl-6- [3- (3-methyl-4-hydroxy-5-tert-butylphenyl) propoxy] dibenzo [d, f] [1 , 3,2] dioxaphosphepine (Sumitomo Chemical Co., Ltd.) 0.075 parts by weight, Sumilizer GS (2,4-di-t-amyl-6- [1- (3,5-di-t) -Amyl-2-hydroxyphenyl) ethyl] phenyl acrylate, manufactured by Sumitomo Chemical Co., Ltd.) 0.075 parts by weight, 2,5-dimethyl-2,5-di (tertiarybutylperoxy) hexane as the organic peroxide Add 0.050 parts by weight Using a 40 mm single-screw extruder (VS40-28, manufactured by Tanabe Plastics Machine Co., Ltd., with full flight screw), melt-kneaded at 250 ° C., and MFR = 5.9 (g / 10 min) polypropylene system A resin composition was obtained.
The obtained polypropylene resin composition was extruded in the same manner as in Example 1 to obtain a film. The properties of the obtained film are shown in Table 3.

Table 1

Table 2

Table 3

Claims (3)

60 to 90% by weight of a polymer component (component A) whose main component is a structural unit derived from propylene, and a propylene-ethylene copolymer component whose content of structural units derived from ethylene is 20 to 48% by weight ( Component B) 10 to 40% by weight (provided that the total content of Component A and Component B is 100% by weight), and the intrinsic viscosity ([η] B) of Component B is 2.0 dL / G and the ratio of the intrinsic viscosity of component A ([η] A) to the intrinsic viscosity of component B ([η] B / [η] A) is 1.3 <[η] B / [η] A ≦ 2.5 containing propylene copolymer (I) 75 to 99% by weight and ethylene polymer (II) 1 to 25% by weight with a melt flow rate of 0.1 to 3.0 g / 10 min Composition (provided that the content of the propylene copolymer (I) and the content of the ethylene polymer (II) Total obtained by melt-kneading to) 100% by weight, the polypropylene resin composition characterized by melt flow rate is 5.0 g / 10 min or more and. A film comprising the polypropylene resin composition according to claim 1. A multilayer film comprising at least one film according to claim 2.