KR20040107517A - Cast Film, Process for Production Thereof, and Bags Made of the Film - Google Patents

Abstract

The cast film of this invention contains the (A) polypropylene component and the (B) copolymer elastomer component, melt flow rate (MFR) is 0.1-15.0 g / 10min, and the propylene unit of the said (B) component is 50- It is 85% and xylene solubles Xs are manufactured from the composition which satisfy | fills the requirements of following (I)-(V), and it is excellent in the balance of impact resistance and rigidity, transparency, and heat-sealing strength at low temperature. In addition, the container of the present invention is made from the cast film of the present invention, the orange peel texture is suppressed, and excellent drop strength and blocking resistance:

(I) Propylene content Fp is 50 to 80%.

(II) Intrinsic viscosity [η] Xs of xylene soluble component Xs is 1.4-5 dL / g.

(III) Intrinsic Viscosity [η] Xs / Xylene Insoluble Content The ratio of intrinsic viscosity [η] X i of Xi is 0.7 to 1.5.

(IV) The propylene content (P _p ) of the high propylene content component is 60 to 95%, and the propylene content (P ′ _p ) of the low propylene content component is 20 to 60%.

(V) P _p , P ′ _p , the proportion (P _f1 ) of the high propylene content component to the Fp, and the proportion (1-P _f1 ) of the low propylene content component to the Fp satisfy certain relational expressions.

Description

Cast Film, Process for Production Thereof, and Bags Made of the Film}

Molded articles using polypropylene are excellent in economy and are used in various fields.

In general, however, molded articles using propylene homopolymers have a high rigidity, but have a disadvantage of poor impact resistance, particularly at low temperatures.

Therefore, many proposals have been made in order to improve impact resistance. For example, the propylene block copolymer which produced the propylene homopolymer first, and then manufactured the ethylene-propylene copolymer elastomer is mentioned. Molded articles using this propylene block copolymer are widely used in various industrial fields such as automobiles and home appliances because of their excellent impact resistance.

However, the propylene block copolymer is excellent in impact resistance and stiffness at low temperatures, but has a drawback in that it is not applicable to applications requiring transparency because of poor transparency.

Therefore, various studies have been made to solve the drawbacks. For example, Japanese Patent Laid-Open No. 6-93061, Japanese Patent Laid-Open No. 6-313048, Japanese Patent Laid-Open No. 7-286020, and Japanese Patent Laid-Open No. 8-27238 disclose crystalline polypropylene and propylene aerials. The propylene block copolymer which controlled each viscosity of a copolymer elastomer, the viscosity ratio, and its content is disclosed.

However, also in these, the balance and transparency of impact resistance and rigidity are not said to be sufficient, and when these were used in the field of a film, there existed a problem that heat sealing strength was not enough. In addition, the container containing such a film has a problem of orange peel texture, low drop strength, poor blocking resistance.

This invention is made | formed in order to solve the said subject, Comprising: It aims at providing the cast film excellent in the balance and transparency of impact resistance and rigidity at low temperature, and excellent in heat sealing strength.

Moreover, another object of this invention is to provide the manufacturing method of the cast film, and the container which the orange peel texture using the cast film was suppressed, and was excellent in falling strength and blocking resistance.

<Start of invention>

MEANS TO SOLVE THE PROBLEM The present inventors earnestly examined and focused on the composition distribution of the xylene soluble component of a polypropylene resin composition in order to solve the said subject of the said prior art, As a result, the propylene block copolymer which has the xylene soluble component of a specific composition distribution has an impact resistance at low temperature. In addition to excellent balance and transparency of performance and stiffness, the present invention has been found to be excellent in heat seal strength when used as a film.

That is, the cast film of this invention is (A) 50-80 mass% of polypropylene components, (B) 50-20 mass% of copolymer elastomer components of propylene, ethylene, and / or (alpha) -olefin of C4-C12 Comprising a composition containing,

The melt flow rate of the composition is in the range of 0.1-15.0 g / 10 min,

The unit derived from propylene in the said (B) copolymer elastomer component is 50-85 mass%,

Xylene soluble component Xs is characterized by satisfy | filling the requirements of following (I)-(V).

(I) Propylene content Fp is 50-80 mass%.

(II) Intrinsic viscosity [η] Xs of xylene soluble component Xs is 1.4-5 dL / g.

(III) Intrinsic viscosity [eta] Xs and ratio of intrinsic viscosity [η] Xi of xylene insoluble content Xi are 0.7-1.5.

(IV) The propylene content (P _p ) of the high propylene content component defined by the 2-site model is 60 mass% or more and less than 95 mass%, and the propylene content (P ' _p ) of the low propylene content component is 20 mass% or more 60 Less than mass%.

(V) the propylene content (P _p ) of the high propylene content component, the propylene content (P ' _p ) of the low propylene content component, and the ratio of the high propylene content component to the Fp (P _f1 ) defined by the 2-site model; , And the ratio (1-P _f1 ) of the low propylene content component to the Fp satisfies Equations 1 and 2 below.

Such a cast film is particularly excellent in balance of impact resistance and rigidity at low temperature and transparency, and also excellent in heat sealing strength. Therefore, it can be used for a wider range of applications, including the automobile and home appliance fields.

Here, it is preferable that the propylene content Fp of xylene solubles Xs exceeds 60 mass%. When the propylene content Fp of the xylene soluble powder Xs exceeds 60 mass%, the transparency and heat-sealing strength of the cast film can be further improved.

Moreover, it is preferable that the refractive index of xylene-insoluble component Xi is 1.490-1.510, and the refractive index of xylene soluble powder Xs is 1.470-1.490. By setting the refractive index of the xylene insolubles Xi and the refractive index of the xylene solubles Xs within a specific range, the transparency, impact resistance, rigidity and heat resistance of the cast film can be more balanced.

Moreover, the manufacturing method of the cast film of this invention is characterized by shape | molding the said composition, after filtering using a metal filter in a molten state.

In this application, it is preferable to use the thing of 5-150 micrometers of filtration precision by JIS B 8356 as said metal fiber filter.

In addition, the laminate of the present invention includes an aluminum foil, a metal vapor deposition film layer, a silicon oxide vapor deposition film layer, a vinylidene chloride resin layer, an ethylene-vinyl acetate copolymer resin saponified resin layer, a polyamide resin layer, a polyester resin layer, It is characterized by having one or more layers selected from a polycarbonate resin layer and an oxygen absorber layer, and the layer containing the cast film of this invention.

Moreover, the container of this invention uses the cast film of this invention, It is characterized by the above-mentioned. Moreover, the container of this invention is characterized by using the laminated body of this invention. These containers have orange peel textures suppressed and excellent drop strength and blocking resistance.

The present invention relates to a cast film containing a polypropylene resin composition. Specifically, it is related with the cast film containing the polypropylene resin composition containing the xylene soluble component which has a specific composition distribution. More specifically, it is related with the cast film which is excellent in transparency and excellent in impact resistance at low temperature, heat resistance, and rigidity. It also relates to a container excellent in orange skin texture, dropping bag strength and blocking resistance.

This application is based on Japanese Patent Application Nos. 2002-135752 and 2003-125360, the contents of which are included as part of this specification.

1 is an example of ¹³ C-NMR spectrum of a propylene-ethylene copolymer elastomer.

Fig. 2 is a diagram showing the names of the respective carbons derived from the chain distribution.

Best Mode for Carrying Out the Invention

The polypropylene resin composition in this invention is a composition containing (A) polypropylene component and (B) copolymer elastomer component.

The polypropylene component (A) in the present invention is selected from a propylene homopolymer, a copolymer of propylene with ethylene and / or an α-olefin having 4 to 12 carbon atoms, and a mixture thereof. As the α-olefin having 4 to 12 carbon atoms, any of 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-decene, 4-methyl-1-pentene and the like can be used herein. . These polymers may be used alone or in combination of two or more.

However, (A) polypropylene component in this invention points out that the unit derived from propylene is 95 mass% or more, and content of these copolymerization components is 5.0 mass% or less. More preferably, the copolymerization component is 0.1-3.5 mass%. If the content of ethylene and / or α-olefin having 4 to 12 carbon atoms is more than 5% by mass, the rigidity and heat resistance in the molded article are significantly lowered, which is not preferable.

Such a polymer is manufactured by a well-known polymerization method using a well-known Ziegler-Natta type catalyst or a metallocene catalyst, for example.

The polypropylene component (A) is preferably a propylene homopolymer when stiffness and heat resistance are particularly required, and a copolymer of propylene, ethylene and / or α-olefin when impact resistance and transparency are particularly required. Do.

The polypropylene component (A) preferably has an intrinsic viscosity [η] of 2.0 to 4.8 dL / g. More preferably, it is the range of 2.5-4.5 dL / g, More preferably, it is 2.8-4.0 dL / g. When intrinsic viscosity [η] exceeds 4.8 dL / g, the extrusion failure at the time of shaping | molding and the fall of transparency of a molded article may arise. In addition, when the intrinsic viscosity [η] is less than 2.0 dL / g, poor extrusion and transparency during molding are less likely to occur, but the rigidity and impact resistance of the product may be lowered in some cases.

The copolymer elastomer component (B) in the present invention is a copolymer elastomer component of propylene with ethylene and / or an α-olefin having 4 to 12 carbon atoms. Arbitrary thing can be used as a C4-C12 alpha-olefin which comprises a copolymer elastomer component, Specifically, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-decene, 4 -Methyl-1-pentene etc. are illustrated.

In this invention, the (B) copolymer elastomer component points out that the unit derived from propylene is 50-85 mass%. Preferably it is 55-85 mass%, More preferably, it is 55-80 mass%. When it exceeds 85 mass%, the impact resistance at low temperature will become inadequate, and when it is less than 50 mass%, transparency may fall or heat sealing strength may fall.

The polypropylene resin composition in this invention contains 50-80 mass% of said (A) polypropylene components, and 50-20 mass% of said (B) copolymer elastomer components. When the content of the (B) copolymer elastomer component in the composition of the present invention is less than 20% by mass, it is inferior in impact resistance, and when it exceeds 50% by mass, the rigidity and heat resistance are inferior. Content of (B) copolymer elastomer component becomes like this. Preferably it is the range of 45-20 mass%, More preferably, it is the range of 40-23 mass%.

The polypropylene resin composition in the present invention has a melt flow rate (hereinafter, may be described as MFR) in the range of 0.1 to 15.0 g / 10 minutes, and is preferably 0.5 to 0.5 in view of transparency, rigidity and impact resistance of the molded article. 10.0 g / 10 minutes, more preferably 0.7 to 7.0 g / 10 minutes. When the MFR is less than 0.1 g / 10 minutes, poor dispersion or poor discharge of each component may be caused during kneading or molding by an extruder, and as a result, impact resistance, rigidity or transparency of the molded article may be reduced. In addition, when the MFR exceeds 15.0 g / 10 min, impact resistance and transparency may be lowered. In addition, MFR is the value measured by 230 degreeC and 2.16 kg load according to JISK7210.

The polypropylene resin composition in this invention contains 20-50 mass% of xylene solubles Xs. Xylene soluble component Xs becomes like this. Preferably it is the range of 20-45 mass%, More preferably, it is the range of 23-40 mass%.

The propylene content Fp of the xylene solubles is 50 to 80 mass%, preferably 60 to 80 mass%. In particular, it is more than 60 mass%. Moreover, More preferably, it is 65-80 mass%, Especially 70-80 mass%, More preferably, it is the range of 70-78 mass%. If the propylene content of the xylene solubles is less than 50 mass%, the transparency is lowered and the heat seal strength is lowered when used in the form of a film. Moreover, when propylene content Fp exceeds 80 mass%, impact resistance in low temperature falls.

Intrinsic viscosity [η] Xs of xylene solubles in the polypropylene resin composition in the present invention is in the range of 1.4 to 5.0 dL / g, preferably in the range of 2.0 to 4.5 dL / g, more preferably 2.5 to 4.0 dL / g. When the intrinsic viscosity [η] Xs exceeds 5.0 dL / g, the impact resistance is improved but the transparency is lowered. If the intrinsic viscosity [?] Xs is less than 1.4 dL / g, the impact resistance is lowered, which is not preferable.

In the polypropylene resin composition of the present invention, the ratio ([η] Xs / [η] Xi) of the intrinsic viscosity [η] Xs of the xylene solubles of the polypropylene resin composition and the intrinsic viscosity [η] Xi of the xylene insolubles is In the range from 0.7 to 1.5. Preferably it is the range of 0.7-1.3, More preferably, it is the range of 0.8-1.2. When this ratio is less than 0.7, transparency improves, but impact resistance at low temperature falls, and when it exceeds 1.5, transparency falls.

It is preferable that the refractive index of a xylene soluble component is 1.470-1.490. Preferably it is 1.470-1.485, More preferably, it is 1.473-1.485. When the refractive index of the xylene soluble component is larger than 1.490, transparency is improved but impact resistance is lowered. Moreover, impact resistance improves that it is less than 1.470, but transparency falls easily.

Moreover, it is preferable that the refractive index of a xylene insoluble content is 1.490-1.510. Preferably it is 1.493-1.505, More preferably, it is the range of 1.495-1.503. If the refractive index of the xylene insoluble is less than 1.490, transparency and impact resistance may be improved, but stiffness and heat resistance may be reduced. On the other hand, when larger than 1.510, rigidity and heat resistance will improve, but impact resistance will fall easily.

The propylene content P _p of the high propylene content component and the propylene content P ' _p of the low propylene content component, the ratio P _f1 of the high propylene content component defined by the 2-site model in the xylene soluble component Xs, and low The ratio (1-P _f1 ) of the propylene content component to Fp satisfies the following equations (1) and (2).

<Equation 1>

<Equation 2>

When P _p / P ' _p is less than 1.90, or when P _f1 / (1-P _f1 ) is 2.00 or less, the interface strength between the xylene soluble component and the xylene insoluble component is lowered, resulting in a decrease in the heat seal strength. Moreover, when P _f1 / (1-P _f1 ) is 6.00 or more, the said interface strength improves, but rigidity and impact resistance fall. These equations are indicative of the composition distribution of xylene solubles, wherein Equation 1 is a measure of the composition difference of the components produced from the two active sites, and Equation 2 is a measure of the components produced from the two active sites. A measure of the amount of production.

In addition, the propylene content (P _p ) of a high propylene content component is 60 mass% or more and less than 95 mass%. Preferably it is 65-90 mass%, More preferably, it is 70-90 mass%. The propylene content (P ′ _p ) of the low propylene content component is at least 20 mass% and less than 60 mass%. Preferably it is 25-55 mass%, More preferably, it is 30-50 mass%. For a two-site model, see HN CHENG, Jounal of Applied Polymer Science, Vol. 35 p 1639-1650 (1988). That is, the two-site model assumes two of the active point (P) that preferentially polymerizes propylene and the active point (P ′) that preferentially polymerizes ethylene, and thus the probability of reaction at these two active sites, ie The actual ¹³ C-NMR using the contents P _p and P ' _p and the ratio P _f1 in which the active point (P) which preferentially polymerizes propylene occupies the entire active point are used as parameters. This can be found by optimizing the three parameters such that the relative intensity of the spectrum of s corresponds to the probability equation. P _p , P ′ _p and P _f1 and propylene content Fp thus obtained satisfy the following equation (3).

P _p and P ′ _p preferably satisfy the following equation (4), more preferably the following equation (5).

P _f1 / (1-P _f1 ) preferably satisfies Equation 6 below, more preferably Equation 7 below.

In addition, P _p , P ' _p , Fp and P _f1 can be obtained by statistical analysis of ¹³ C-NMR spectra.

Hereinafter, the said method is demonstrated, for example, when a component (B) is a propylene ethylene copolymer elastomer.

1 is a ¹³ C-NMR spectrum of a typical propylene-ethylene copolymer elastomer, the spectrum giving ten different peaks with differences in the chain distribution (method of arranging ethylene and propylene). The name of this chain is Macromolecules, Vol. 10, p536-544 (1977), and is named as shown in FIG. This chain can be represented as the product of reaction probabilities, assuming the reaction mechanism of copolymerization. Therefore, the relative intensities of the peaks of each of (1) to (10) when the total peak intensity is 1 can be expressed as a probability equation based on Bernoulli statistics using the reaction probability and the abundance of each site as parameters. . (1) In the case of Sαα, when the propylene unit is the symbol P and the ethylene unit is the symbol E, the chains thereof are three kinds of [PPPP], [PPEE], and [EPPE], and these are summed by the reaction probability. . The rest (2) to have a peak intensity established a formula in the same manner even for the peak actually measured these 10 equations of (10) such that the closer can be determined by the parameters, that is to optimize the P _p, P _'p and P _f1 . In optimization, a regression calculation is performed until the residual of the measured value of peak intensity and the theoretical value obtained from each formula shown in Table 1 by a least-square method becomes 1x10 <^-5> or less. Algorithms for performing such regression calculations are described, for example, in HN CHENG, Jounal of Applied Polymer Sience, Vol. 35 p 1639-1650 (1988).

Next, the manufacturing method of the polypropylene resin composition in this invention is stated. There is no restriction | limiting in particular in the manufacturing method of the polypropylene resin composition in this invention, A well-known method can be employ | adopted. For example, after mixing each component with (A) component and (B) component using a ribbon blender, a tumbler, a Henschel mixer, etc., it knead | mixes and mixes at the temperature of 170-280 degreeC, Preferably it is 190-260 degreeC It is obtained by melt kneading using a roll, a Benbury mixer, a single screw or twin screw extruder, or the like.

Moreover, the polypropylene resin composition in this invention may be what manufactured (A) component and (B) component in a single polymerization system by the multistage polymerization method. Moreover, after (A) component and (B) component are manufactured in a single polymerization system by the multistage polymerization method, the (A) component and / or (B) component may also be added.

The polypropylene component (A) and the copolymer elastomer component (B) can be produced by a known method. Specifically, propylene can be produced by polymerizing or copolymerizing propylene with other olefins using a Ziegler catalyst or a metallocene catalyst. Examples of the Ziegler catalyst include titanium trichloride catalysts and magnesium-supported titanium catalysts. Examples of the magnesium-supported catalyst system include a catalyst system composed of (a) a solid catalyst component containing titanium, magnesium and halogen as essential components, (b) an organoaluminum compound, and (c) an electron donating compound. These are Japanese Patent Laid-Open No. 57-63310, Japanese Patent Laid-Open No. 57-63311, Japanese Patent Laid-Open No. 58-83006, Japanese Patent Laid-Open No. 58-138708, Japanese Patent Laid-Open No. 62-20507, and Japanese Patent Laid-Open 61-296006, Unexamined-Japanese-Patent No. 2-229806, Unexamined-Japanese-Patent No. 2-33103, Unexamined-Japanese-Patent No. 2-70708, etc. are described. Moreover, these can also be used as a prepolymerization catalyst which polymerizes a small amount of olefins before manufacture of each component.

In manufacture of (B) component in this invention, if it is a manufacturing condition similar to the prescription | regulation of the composition in this invention, there will be no restriction | limiting in particular, Specifically, the following method is illustrated.

1. A process for producing component (B) using a catalyst which provides a polymer having a relatively broad compositional distribution, stereoregular distribution or molecular weight distribution in the catalyst.

2. A method for preparing the catalyst under conditions in which the composition distribution, stereoregularity distribution, or molecular weight distribution is relatively wide, i.e., the amount of the electron donating compound and the organoaluminum compound is changed or prepared using a plurality of electron donating compounds. Process for preparing component (B) using one catalyst.

3. A method for producing under a polymerization condition in which the composition distribution, stereoregularity distribution, or molecular weight distribution becomes relatively broad, that is, (A) by varying polymerization conditions such as temperature and monomer composition ratio of each step by multi-stage polymerization (B) (B) Generally, since a composition distribution changes with the composition of the polymer obtained, the method of manufacturing (B) component by adjusting the composition of a copolymer elastomer so that a target composition distribution may be obtained.

4. A method of using a plurality of components having different propylene contents while having a uniform composition distribution obtained by a metallocene catalyst or the like.

By using (B) component manufactured by such a method, the polypropylene resin composition by which the composition distribution of the said xylene soluble component was adjusted can be obtained easily.

In the production of the above components, a polymerization method such as slurry polymerization or bulk polymerization or solution polymerization or gas phase polymerization, which is carried out in the presence of a liquefied α-olefin solvent such as hexane, heptane, kerosene or kerosene or propylene such as propylene, is employed. 200 degreeC, Preferably it is carried out in the temperature range of 30-150 degreeC, and the pressure range of 0.2-5.0 MPa. As the reactor in the polymerization process, those conventionally used in the art may be suitably used, and for example, a stirred bed reactor, a fluidized bed reactor, a circulating reactor may be used, and may be a continuous, semibatch or batch method. In addition, at the time of superposition | polymerization, the molecular weight of the polymer obtained by adding hydrogen etc. can be adjusted, for example.

Other resin, additives, etc. can be mix | blended with the polypropylene resin composition in this invention in the range which does not impair the objective of this invention. Examples of these other additives include antioxidants, weathering stabilizers, antistatic agents, lubricants, antiblocking agents, antifogging agents, dyes, pigments, oils, waxes, and the like.

The film of this invention is a cast film which shape | molded the polypropylene resin composition in this invention by T-die method. These cast films may be used alone, or may be laminated with other materials.

As a manufacturing method of the film of this invention, the method of shape | molding the thing which filtered the above-mentioned polypropylene resin composition in the molten state using the metal fiber filter by various film molding methods is preferable.

As a metal fiber filter used for this invention, a mesh filter, a sintered mesh filter, a porous metal filter, a metal fiber sintered filter, and those which combined these filters suitably are mentioned. As a metal fiber filter, it is preferable that the filtration precision by JIS B 8356 is 5-150 micrometers, It is more preferable that it is 20-120 micrometers, It is especially preferable that it is 40-100 micrometers. If the filtration accuracy is less than 5 µm, the pressure rise during extrusion molding is likely to occur, possibly deteriorating the moldability, and in some cases, the shear heat generation of the molten resin may be severe and accompanied with the generation of gas. On the other hand, when it exceeds 150 micrometers, there exists a tendency for the improvement effect of an orange peel texture to be hard to express, and a gel will generate | occur | produce easily in a cast film. As a shape of a metal fiber filter, a tubular filter, a pleat cylindrical filter, a leaf disk filter, a flat cylindrical filter, etc. are mentioned. Among these, a leaf disc filter is preferable from a viewpoint of the improvement effect of an orange peel texture, pressure resistance, and a filtration area. Metal fiber filter from Nippon Seisen Co., Ltd. from `` brand name: NASLON FILTER '' and FUJI FILTER MGF.CO., LTD. It is marketed as "brand name: FUJI METAL FIBER", These can be used preferably.

The metal fiber filter is preferably installed between the die and an extruder of a film forming machine such as a T die molding machine, and it is preferable to install the molten resin so as to pass through the die immediately after passing through the metal filter part, and to be provided immediately before the die. It is more preferable. As temperature of the metal fiber filter part provided in the extruder, 200-280 degreeC is preferable and 220-260 degreeC is more preferable. If the temperature is less than 200 ° C., the effect of improving the orange peel texture is insufficient, and it is likely to be accompanied by an increase in the extrusion pressure. On the other hand, when it exceeds 280 degreeC, there exists a tendency for resin to deteriorate or the improvement effect of an orange peel texture falls.

In particular, among these film forming machines, the use of a T die molding machine is preferable in terms of excellent film thickness accuracy of the cast film obtained, low anisotropy of physical properties such as shrinkage rate and strength, and high film impact strength. Do.

The laminated body of this invention is an aluminum foil, a metal vapor deposition film, a silicon oxide vapor deposition film, a vinylidene chloride resin layer, an ethylene-vinyl acetate copolymer resin saponified resin layer, a polyamide resin layer, and polyester to the film of this invention. The layer containing one or more layers selected from a resin layer, a polycarbonate resin layer, and an oxygen absorber layer is laminated | stacked. Of these layers, vinylidene chloride resin and ethylene-vinyl acetate copolymer saponification are effective as gas barrier layers. Moreover, the layer etc. which contain iron oxide are mentioned as an oxygen absorber layer.

The laminated body of this invention is obtained by laminating | stacking the said layer by co-extrusion method, dry lamination method, and extrusion lamination method, using the well-known dry laminated molding machine etc., without interposing an adhesive to the film of this invention, or modifying it. Can be.

The container of this invention uses the film or laminated body of this invention. As a container, free-standing bag-type containers, such as a bag-type container which sealed two films or laminated bodies in all directions, and a standing pouch, etc. are mentioned. A packaging container can be manufactured by heat-sealing two films or laminated bodies, for example at 0.2 to 10 second at the temperature of 180-250 degreeC.

The container of the present invention can be suitably used for packaging containers subjected to heat sterilization such as food. In particular, the resin composition of the present invention, the film and the packaging container formed therein are retort sterilized by encapsulating oily foods such as curry, fried rice, beef, pork, and poultry, which were easily exposed to orange peel texture in a conventional packaging container. Even when it is, it is a container excellent in appearance without the generation of orange peel texture.

In addition, the heat sterilization used in the present invention is a method of killing microorganisms which are the main cause of deterioration of food, and is usually carried out at a temperature range of 60 to 135 ° C, depending on the target bacteria. These methods of using heating steam having a temperature of 100 ° C. or higher and hot water mainly during heat sterilization are called retort sterilization, and are a method of treating at high temperature and short time so as not to impair the taste and flavor of the contents.

Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited to these.

In addition, the measuring method of various substances is as follows.

Measurement of Melt Flow Rate (MFR):

According to JIS-K7210, it measured on the conditions of the temperature of 230 degreeC, and the load of 2160 g.

Measurement of ¹³ C-NMR (calculation of P _p , P ′ _p and P _f1 ):

It was measured by JNM-GSX 400 made by Nippon Electronics (measurement mode: proton decoupling method, pulse width: 8.0 Hz, pulse repetition time: 3.0 s, integration count: 10000 times, measurement temperature: 120 deg. C, internal standard: hexamethyl Disiloxane, solvent: 1,2,4-trichlorobenzene / benzene-d6 (volume ratio 3/1), sample concentration: 0.1 g / ml), P _p , P 'as described above by statistical analysis thereof _p and P _f1 were obtained.

Determination of Xylene Available Quantity Xs:

In 250 ml of orthoxylene, 2.5 g of the sample was added, stirred while heating, the temperature was raised to the boiling temperature, and dissolved completely for at least 30 minutes. After confirming complete dissolution, the mixture was allowed to cool to 100 ° C or lower while stirring and held in a thermostatic chamber maintained at 25 ° C for 2 hours. Thereafter, the precipitated component (xylene insoluble Xi) was filtered through filter paper. Then, xylene soluble matter Xs was obtained by distilling and drying xylene under nitrogen stream while heating this filtrate.

Determination of Propylene Content:

It was calculated based on the results of the ¹³ C-NMR.

Measurement of Ultimate Viscosity:

In decalin, it measured at 135 degreeC.

Measurement of the refractive index:

Press molding films of 50 to 80 μm thickness respectively for xylene solubles Xs and xylene insolubles Xi (preheat 5 minutes at 230 ° C., degas for 30 seconds, pressurize for 1 minute at 6 MPa, cool for 3 minutes with press at 30 ° C.) Prepared by. After performing the state adjustment for 24 hours at normal temperature, the obtained film was measured with the Abbe refractometer by Adago using ethyl salicylate as an intermediate liquid.

Preparation of (A) component and (B) component

According to the following, (A) component was prepared in step 1 of multistage superposition | polymerization, and (B) copolymer elastomer component was then manufactured in step 2. Physical properties of these components are shown in Tables 2 and 3 below.

[Production of PP1]

Preparation of Solid Catalyst

56.8 g of anhydrous magnesium chloride, 100 g of anhydrous ethanol, 500 ml of petroleum jelly "CP15N" made by Idemitsu Kosan Co., Ltd., and silicone oil made by Shin-Etsu Silicones Silicone Co., Ltd. In 500 ml of KF96 '' was completely dissolved at 120 ° C under a nitrogen atmosphere. This mixture was stirred for 2 minutes at 120 degreeC and 5000 revolutions / minute using the TK homo mixer by Tokushu Kika Kogyo Corporation. Transfer was carried out not to exceed 0 ° C. in 2 liters of dry heptane while maintaining stirring. The obtained white solid was sufficiently washed with anhydrous heptane, dried under vacuum at room temperature, and partially deethanolized under a stream of nitrogen. 30 g of the spherical solid of the obtained MgCl ₂ 1.2 C ₂ H ₅ OH was suspended in 200 ml of anhydrous heptane. 500 ml of titanium tetrachloride was dripped at 1 degreeC, stirring at 0 degreeC. Next, 4.96 g of diisobutyl phthalate was added when heating started and it became 40 degreeC, and it heated up to 100 degreeC for about 1 hour. After reacting at 100 degreeC for 2 hours, the solid part was extract | collected by hot filtration. Thereafter, 500 ml of titanium tetrachloride was added to the reaction product, followed by stirring, followed by reaction at 120 ° C for 1 hour. After completion | finish of reaction, the solid part was collect | recovered again by high temperature filtration, and it wash | cleaned 7 times with 1.0 liter of hexane of 60 degreeC, and three times with 1.0 liter of hexane of room temperature, and obtained the solid catalyst. It was 2.36 mass% when the titanium content rate in the obtained solid catalyst component was measured.

1) prepolymerization

Under a nitrogen atmosphere, 500 ml of n-heptane, 6.0 g of triethylaluminum, 0.99 g of cyclohexylmethyldimethoxysilane, and 10 g of the obtained polymerization catalyst were charged in a 3-liter autoclave for 5 minutes at a temperature range of 0 to 5 ° C. Stirred. Next, propylene was supplied in an autoclave so that 10 g of propylene might be polymerized per 1 g of polymerization catalysts, and prepolymerized in the temperature range of 0-5 degreeC for 1 hour. The obtained prepolymerization catalyst was washed three times with 500 ml of n-heptane and used for the following polymerization.

2) main polymerization

Step 1: (A) Preparation of Polypropylene Component

In a nitrogen atmosphere, 2.0 g of a prepolymerized solid catalyst prepared by the above-described method, 11.4 g of triethylaluminum, 1.88 g of cyclohexylmethyldimethoxysilane were added to an autoclave with an inner volume of 60 liters, followed by 18 kg of propylene, Hydrogen was added to 5000 mol ppm with respect to propylene, and it heated up to 70 degreeC, and superposed | polymerized for 1 hour. After 1 hour, unreacted propylene was removed to terminate the polymerization.

Step 2: (B) Preparation of Propylene-Ethylene Copolymer Elastomer

As described above, after the polymerization in Step 1 is terminated, the liquid propylene is removed and a mixed gas of 2.2 Nm ³ / hour of ethylene / propylene = 26/74 (mass ratio) at a temperature of 75 ° C., and hydrogen is added to ethylene, propylene and hydrogen The polymer was fed in an amount of 40,000 mol ppm based on the total amount of and polymerized for 60 minutes. After 40 minutes the unreacted gas was removed to terminate the polymerization. As a result, 6.6 kg of polymer was obtained.

[Production of PP-2]

Step 2: (B) In the production of the propylene-ethylene copolymer elastomer, polymerization was carried out in the same manner as in the production of PP-1, except that the amount of hydrogen was supplied to be 50,000 mol ppm. As a result, 6.3 kg of polymer was obtained.

[Production of PP-3]

Step 2: In the production of the (B) propylene-ethylene copolymer elastomer, polymerization was carried out in the same manner as in the preparation of PP-1, except that the amount of hydrogen used was adjusted to 20,000 mol ppm. As a result, 5.8 kg of polymer were obtained.

[Production of PP-4]

Step 1: (A) Preparation of Polypropylene Component

In a nitrogen atmosphere, 2.0 g of a prepolymerized solid catalyst prepared by the method of PP-1, 11.4 g of triethylaluminum, and 1.88 g of cyclohexylmethyldimethoxysilane were added to an autoclave equipped with an internal 60 liter stirrer. Hydrogen was added to 18 kg of propylene, 120 L of ethylene, and 6500 mol ppm of propylene, and the temperature was raised to 70 ° C to carry out polymerization for 1 hour. After 1 hour, unreacted propylene was removed.

Step 2: (B) Preparation of Propylene-Ethylene Copolymer Elastomer

The polymerization was carried out in the same manner as in the preparation of PP-1, except that hydrogen was supplied at 40,000 mol ppm and polymerized for 40 minutes. As a result, 5.7 kg of a polymer was obtained.

[Production of PP-5]

In the polymerization in step 2, the polymerization was carried out in the same manner as in the preparation of PP-1, except that the polymerization was performed for 45 minutes while supplying hydrogen to 30,000 mol ppm with a mass ratio of ethylene / propylene mixed gas of 26/74. As a result, 6.1 kg of polymer was obtained.

[Production of PP-6]

In the preparation of PP-1, polymerization was carried out in the same manner except that the mass ratio of the ethylene / propylene mixed gas was 50/50.

[Production of PP-7]

In the preparation of PP-1, polymerization was carried out in the same manner except that the mass ratio of ethylene / propylene mixed gas was 38/62.

[PP-8 and PP-9]

The polypropylene resin compositions of Comparative Examples 3 and 4 shown in Table 3 below were prepared by a catalyst comprising a titanium tetrachloride supported on magnesium chloride, an organoaluminum compound, and an electron donating compound.

[Production of PP-10]

Preparation of TiCl ₄ [C ₆ H ₄ (COOiC ₄ H ₉ ) ₂ ]

To a solution of 1.0 liter of hexane containing 19 g of titanium tetrachloride, 27.8 g of diisobutyl phthalate: C ₆ H ₄ (COOiC ₄ H ₉ ) ₂ was added dropwise at about 30 minutes while maintaining the temperature at 0 ° C. After completion of the dropwise addition, the temperature was raised to 40 ° C and allowed to react for 30 minutes. After the reaction was completed, the solid portion was collected and washed five times with 500 ml of hexane to obtain the target product.

Preparation of Solid Catalyst

20 g of the solid catalyst obtained in the production method of PP-1 was suspended in 300 ml of toluene, and the obtained TiCl ₄ [C ₆ H ₄ (COOiC ₄ H ₉ ) ₂ ] was added at a temperature of 25 ° C., and stirred for 1 hour, followed by high temperature filtration. The solid portion was taken. The reaction was then washed three times with 500 ml of toluene at 90 ° C. and three times with 500 ml of hexane at room temperature. Titanium content rate in the obtained solid catalyst component was 1.78 mass%.

Prepolymerization

In a 3 liter autoclave under a nitrogen atmosphere, 500 ml of n-heptane, 6.0 g of triethylaluminum, 3.98 g of dicyclopentyldimethoxysilane and 10 g of the solid catalyst obtained above were added to a temperature range of 0 to 5 ° C. Stir for 5 minutes at. Next, propylene was supplied in an autoclave so that 10 g of propylene was polymerized per 1 g of the polymerization catalyst, and prepolymerized in a temperature range of 0 to 5 ° C for 1 hour. The obtained prepolymerized solid catalyst was washed three times with 500 ml of n-heptane and used for the following polymerization.

polymerization

Step 1: Preparation of Homopolypropylene

In a nitrogen atmosphere, 2.0 g of a prepolymerized solid catalyst prepared by the above-described method, 11.4 g of triethylaluminum, 6.84 g of dicyclopentyldimethoxysilane were added to an autoclave with an inner volume of 60 liters, followed by 18 kg of propylene, Hydrogen was added to 1.4 mol% with respect to propylene, and it heated up to 70 degreeC, and superposed | polymerized for 1 hour. After 1 hour, unreacted propylene was removed.

Step 2: Preparation of Propylene-Ethylene Copolymer Elastomer

After the polymerization of Step 1 described above, the mixture was copolymerized at a temperature of 75 ° C. for 40 minutes at a feed rate of 2.2 Nm ³ / hour of mixed gas of ethylene / propylene = 40/60 (mass ratio) and 20 NL / hour of hydrogen. After 40 minutes, the unreacted gas was removed to terminate the polymerization.

Preparation of Polypropylene Resin Compositions and Films

<Example 1>

0.30 mass part of phenolic antioxidants and 0.1 mass part of calcium stearate were added to 100 mass parts of PP-1 obtained above, and it mixed for 3 minutes at room temperature with the Henschel mixer. The pellets of the composition were obtained by kneading the mixture at a cylinder set temperature of 210 deg. C by an extruder (Nakatani VSK type 40 mm extruder) having a screw diameter of 40 mm.

The pellet was then extruded with a T die (Toshiba Kikai extruder, double flight screw, screw diameter 65 mm, L / D 26.2, die temperature 260 ° C, cylinder temperature 260 ° C). The film | membrane was formed on the conditions of the screw rotation speed of 80 rpm, the take-up speed of 12 m / sec, and the cooling roll temperature of 50 degreeC, and the film of thickness about 70 micrometers was shape | molded.

<Examples 2 to 5 and Comparative Examples 1 to 5>

A resin composition and a film were prepared in the same manner as in Example 1 except that PPT 1 and 3, respectively, were used instead of PP-1.

For each film obtained in Examples 1 to 5 and Comparative Examples 1 to 5, heat sealing strength, film impact (cold impact strength), tensile modulus (Young's modulus) and transparency were measured. The measurement results are shown in Tables 2 and 3 below. The measuring method is as follows.

Heat seal strength:

The superposition of the 60 micron-thick PET film laminated with the adhesive resin and the film made of the polypropylene resin composition was superimposed in two sets so that the polypropylene resin composition film was inward, so that the tester Sangyo Co., Ltd. The heat sealing was carried out using a heat sealer made of 1 mm at a width of 5 mm of the heat sealing bar, a sealing temperature of 160 ° C. and 170 ° C., and 0.2 MPa, and perpendicular to the flow direction (MD) of the resin at the time of molding.

After 48 hours of conditioning at room temperature, the heat-sealed film was sampled at 15 mm in width and heated in a direction of opening the heat seal at 180 ° at a rate of 50 mm between chucks and a tensile speed of 300 mm / min. The tensile load until the seal was broken was applied, and the average strength therebetween was obtained. The average value of the 7 points of average strength was made into heat sealing strength.

Measurement of Film Impact (Low Temperature Impact Strength):

The film was sampled in the size of 10 cm x 1 m, and it was left to stand in a constant temperature room of -5 degreeC for 2 hours. Subsequently, a 1/2 inch radius of core was attached to a film impact tester manufactured by Toyo Seiki Seisaku-Sho, Ltd. in this chamber and 10 times per sample. The test was done and the impact energy was measured. The value of these impact energy was divided by the thickness of the film, and the average value of the ten points was taken as the film impact, which was taken as a measure of impact resistance.

Tensile Modulus (Young's Modulus):

According to the method of JIS K 7127, it measured about the flow direction (MD) of resin at the time of shaping | molding on the conditions of 20 mm of sample width, 250 mm between chucks, and 5 mm / min of tensile velocity.

Transparency:

The total haze was measured according to the method of JIS K 7105.

[Production of PP-11]

1) prepolymerization

In a nitrogen atmosphere, in a 3 liter autoclave, 500 ml of n-heptane, 6.0 g of triethylaluminum, 0.99 g of cyclohexylmethyldimethoxysilane, and the polymerization catalyst obtained above (= the solid catalyst described in [Production of PP-1]) ) 10 g were added and stirred for 5 minutes at a temperature in the range of 0 to 5 ° C. Next, propylene was fed in an autoclave so that 10 g of propylene was polymerized per 1 g of the polymerization catalyst, and prepolymerized in a temperature range of 0 to 5 ° C for 1 hour. The obtained prepolymerization catalyst was washed three times with 500 ml of n-heptane and used for the following polymerization.

2) main polymerization

In a first loop polymerization reactor set at 70 ° C., 10 g / hour of prepolymerized solid catalyst prepared according to the above method, 57 g / hour of triethylaluminum, 9.4 g / hour of cyclohexylmethyldimethoxysilane, The polymerization was carried out while supplying propylene at 90 kg / hr and hydrogen at a rate of 21.6 g / hr (A) to produce a polypropylene component. After the liquid propylene was removed from the mixture discharged from the first polymerization reactor, the mixture was fed to a second polymerization reactor set at 75 ° C. At the same time, gas phase polymerization was carried out for 50 hours while supplying a mixture gas of ethylene / propylene = 26/74 (mass ratio) to a second polymerization reactor at a rate of 2.2 Nm ³ / hour and hydrogen at a rate of 4 g / hour (B) propylene An ethylene copolymer elastomer was prepared. The target composition was obtained by removing unreacted propylene gas or the like from the composition discharged from the second polymerization reactor.

<Example 6>

The mixture which added 0.10 mass part of phenolic antioxidants and 0.05 mass part of calcium stearate at room temperature was added to 100 mass parts of PP-11 obtained above using the Henschel mixer at room temperature with a screw diameter of 65 mm and the cylinder set temperature 230 degreeC Pellets of the composition were obtained by continuously feeding and kneading at.

As the film forming machine, an extruder was made using a T die molding machine manufactured by Toshiba Machine Co., Ltd. having a die width of 3,400 mm, a lip width of 0.8 mm, and a feed block type with an extruder having a diameter of 115 mm φ and a diameter of 65 mm φ. The metal fiber filter which set 80 sheets of "brand name: Nasron filter NF12D (filtration precision 40 micrometers by JIS B 8356) by Nihon Seisen Corporation was set between and T die | dye.

The pellets were melted by an extruder, the molten resin was supplied to a T die at a die temperature of 230 ° C. through a metal fiber filter, and a film having a thickness of 70 μm was formed under the condition of a cooling temperature of 50 ° C.

The heat sealing strength, film impact (low temperature impact strength), tensile modulus (Young's modulus), and transparency of the film obtained in Example 6 were measured. The measurement results are shown in Table 2. In addition, the following items were evaluated. The results are shown in Table 4.

Measurement of blocking strength:

The film was cut out to a size of 10 cm × 10 cm, the films were overlapped, and a load of 10 kg was applied and left for 24 hours in an atmosphere of a temperature of 50 ° C. Next, using a tensile tester (TENSILON UCT-500 manufactured by ORIENTEC Co., Ltd.), the strength at the time of peeling the entire surface of the film blocking at a peeling speed of 500 mm / min was measured, and the average value of these seven points was measured. Was the blocking strength (g / 1OO cm ² ). The greater the blocking strength, the more severe the blocking.

Retort Treatment:

A polyester film having a thickness of 12 μm, an aluminum foil having a thickness of 9 μm, and the above film are laminated in this order by laminating by dry lamination so that the thickness of the polyurethane-based adhesive layer between each film and the aluminum foil is 2 μm. Was prepared. This laminated body (15 cm x 18 cm) was superimposed on two sheets so that the films could come into contact with each other, and the three periphery portions were heat-sealed with a heat sealing width of 8 mm at a temperature of 230 deg. Was prepared and the heat seal strength of the heat seal was measured (heat seal strength before retort). I pack 50 grams of `` brand name: Chinjaorousu '' made by AJINOMOTO CO., LTD which is a retort food marketed as contents in this packing bag, and the remaining one is three A container including a packaging bag was prepared by heat sealing in the same manner as the above. This container was retort-treated for 30 minutes at 121 degreeC using RCS-40T by Hisaka Seisakusho Corporation. The heat seal strength of the heat seal portion of the container after the retort treatment was measured. In addition, the orange peel texture was evaluated by visual confirmation.

In addition, a container in which only salad oil was enclosed in a packaging bag was prepared, and a container in which a mixing ratio (volume ratio) of water and salad oil in the same manner was packed in a packaging bag of 9: 1. The retort process was performed on these containers on the same conditions, and the heat sealing strength of the heat sealing part of the container after a retort was measured.

Orange Peel Texture Rating:

About orange peel texture, the generation | occurrence | production state of the uneven | corrugated state (orange peel texture) of the surface layer of the packaging bag after a retort process was visually determined by the five-step method based on the following references | standards.

1: Orange peel texture is not observed at all.

2: A little orange peel texture with uneven irregularities is observed but can withstand use.

3: Significant occurrences of orange peel texture with uneven irregularities can be seen but withstand use.

4: The texture of the orange shell with the shape of the uneven surface shows on the whole side of the bag and it is unbearable.

5: Slightly uneven orange peel texture, visible on the entire surface of the packaging bag, tolerable to use.

Tropic strength test:

180 grams of water was enclosed in a 15 cm x 18 cm packaging bag prepared by the above method, to prepare a pouch. Next, the retort treatment was carried out by the same method and conditions as above. The 30 pouches obtained were repeatedly dropped in a horizontal state at a height of 1.2 m under an atmosphere of a temperature of 0 ° C., and the number of times (F50) until 15 halves of 30 pouches were broken was determined.

<Example 7>

It carried out similarly to Example 6 except having used the filter which set 80 sheets of Nasron filter NF14D (filtration precision 80 micrometers) by Nihon Seisen Corporation as a metal fiber filter.

<Example 8>

It carried out similarly to Example 6 except having used the screen mesh of the sieve opening 20/60/120/60/20 mesh instead of the metal fiber filter.

Comparative Example 6

Except having used the resin of the comparative example 1, it carried out similarly to Example 6 below.

Measurement results of Examples 7 to 8 and Comparative Example 6 are shown in Table 4 below.

Example 6 Example 7 Example 8 Comparative Example 6 Evaluation of the Orange Peel Texture One 2 4 4 Heat seal strength (N / 15mm width) Retort 83 80 76 85 Retortfu Ginzaolos 72 67 65 51 Retortfu Salad Oil 71 68 64 58 Retort mixed solution 68 65 62 48 Drop strength (F50) 48 42 38 3 Blocking Strength (g / 100㎠) 50 55 65 160

As is clear from Tables 2 and 3, the film by the polypropylene resin composition of the present embodiment is improved in heat sealing strength, film impact (low temperature impact strength), tensile modulus (Young's modulus) and transparency in a balanced manner.

However, transparency is low in the comparative example 1 with few units derived from propylene among the (B) copolymer elastomer components. In addition, in Comparative Example 2 which does not satisfy the lower limit of Equation 2 and Comparative Example 3 which does not satisfy Equation 1, the heat seal strength is low. In addition, in Comparative Example 4, which has a large propylene content Fp of Xs and does not satisfy the upper limit of Equation 2, the heat sealing strength and the impact resistance are low. In the comparative example 5 which does not satisfy | fill the lower limit of Formula (2), heat sealing strength is low.

As is apparent from Table 4, the container according to the present embodiment is suppressed in the generation of orange peel texture, excellent in appearance, less change in heat seal strength before and after the retort, excellent in drop strength, and excellent in blocking resistance.

As mentioned above, the cast film of this invention is especially excellent in the balance and transparency of impact resistance and rigidity at low temperature, and excellent in heat-sealing strength. Therefore, it can be used for a wider range of applications, including the automotive and home appliances fields.

In particular, when the propylene content Fp of the xylene soluble powder Xs exceeds 60 mass%, transparency and heat sealing strength can be further improved.

Moreover, transparency, impact resistance, rigidity, and heat resistance can be balanced more highly by making the refractive index of xylene insoluble matter Xi and the refractive index of xylene soluble matter Xs in a specific range.

Moreover, the container of this invention is suppressed orange peel texture, and is excellent in falling strength and blocking resistance.

Claims (8)

A composition containing (A) 50 to 80% by mass of a polypropylene component, (B) 50 to 20% by mass of a copolymer elastomer component of propylene with ethylene and / or an α-olefin having 4 to 12 carbon atoms, The melt flow rate of the composition is in the range of 0.1-15.0 g / 10 min, The unit derived from propylene in the said (B) copolymer elastomer component is 50-85 mass%, Xylene soluble component Xs satisfy | fills the requirements of following (I)-(V), The cast film characterized by the above-mentioned. (I) Propylene content Fp is 50-80 mass%. (II) Intrinsic viscosity [η] Xs of xylene soluble component Xs is 1.4-5 dL / g. (III) The ratio of intrinsic viscosity [η] Xs and intrinsic viscosity [η] Xi of xylene insoluble content Xi is 0.7 to 1.5. (IV) The propylene content (P _p ) of the high propylene content component defined by the 2-site model is 60 mass% or more and less than 95 mass%, and the propylene content (P ' _p ) of the low propylene content component is 20 mass% or more 60 Less than mass%. (V) Propylene content (P _p ) of the high propylene content component, propylene content (P ' _p ) of the low propylene content component, and the ratio of the high propylene content component to the Fp (P _f1 ) defined by the 2-site model. , And the ratio (1-P _f1 ) of the low propylene content component to the Fp satisfy the following formulas (1) and (2). <Equation 1> <Equation 2> The cast film of claim 1, wherein the propylene content Fp of the xylene soluble component Xs exceeds 60% by mass. The cast film according to claim 1 or 2, wherein the refractive index of the xylene insolubles Xi is 1.490 to 1.510, and the refractive index of the xylene solubles Xs is in the range of 1.470 to 1.490. (A) 50 to 80 mass% of polypropylene component, (B) 50 to 20 mass% of copolymer elastomer component of propylene and ethylene and / or α-olefin having 4 to 12 carbon atoms, The melt flow rate is in the range of 0.1 to 15.0 g / 10 min, The unit derived from propylene in the said (B) copolymer elastomer component is 50-85 mass%, A method for producing a cast film, wherein the xylene soluble component Xs satisfies the following requirements (I) to (V) after being filtered using a metal filter in a molten state. (I) Propylene content Fp is 50-80 mass%. (II) Intrinsic viscosity [η] Xs of xylene soluble component Xs is 1.4-5 dL / g. (III) Intrinsic viscosity [η] The ratio of the intrinsic viscosity [η] Xi of Xs and xylene insoluble content Xi is 0.7 to 1.5. (IV) The propylene content (P _p ) of the high propylene content component defined by the 2-site model is 60 mass% or more and less than 95 mass%, and the propylene content (P ' _p ) of the low propylene content component is 20 mass% or more 60 Less than mass%. (V) the propylene content (P _p ) of the high propylene content component, the propylene content (P ' _p ) of the low propylene content component, and the ratio of the high propylene content component to the Fp (P _f1 ) defined by the 2-site model; , And the ratio (1-P _f1 ) of the low propylene content component to the Fp satisfy the following formulas (1) and (2). <Equation 1> <Equation 2> The method for producing a cast film according to claim 4, wherein a filtration precision of JIS B 8356 is 5 to 150 µm as the metal fiber filter. Aluminum foil, metal deposited film layer, silicon oxide deposited film layer, vinylidene chloride resin layer, ethylene-vinyl acetate copolymer resin saponified resin layer, polyamide resin layer, polyester resin layer, polycarbonate resin layer and oxygen One or more layers selected from absorber layers, and It has a layer containing the cast film as described in any one of Claims 1-3, The laminated body characterized by the above-mentioned. The container which uses the cast film as described in any one of Claims 1-3. The container of Claim 6 is used.