Polypropylene resin composition, laminate and method for producing same

Abstract

To provide a polypropylene-based resin composition which has small neck-in in high-temperature extrusion molding of, for example, 290°C or higher, is excellent in extrusion lamination workability at high molding speed of, for example, 200 m / min or higher, and is excellent in transparency, and a laminate using the polypropylene-based resin composition.SOLUTION: A polypropylene-based resin composition contains 2-30 mass% of a polypropylene resin (X1) having specific characteristics, 5-98 mass% of a polypropylene resin (X2) having specific characteristics, and 0-80 mass% of a polypropylene-based resin (Y) having specific characteristics, wherein the total amount of the polypropylene resin (X1), the polypropylene resin (X2) and the polypropylene-based resin (Y) is 100 mass%.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a polypropylene-based resin composition and a laminate as well as methods for producing the same. More specifically, the present invention relates to a polypropylene-based resin composition which has small neck-in during high-temperature extrusion molding at, for example, 290°C or higher, high extensibility and therefore excellent extrusion lamination processability at high speeds, for example, at a molding speed of 200 m / min or higher, and which has excellent transparency and therefore excellent visibility of contents, and a laminate using the polypropylene-based resin composition. [Background technology]

[0002] Conventionally, laminates that have been imparted with water vapor barrier properties, waterproof properties, rust resistance, and scratch resistance by laminating polyolefin resins onto substrates such as various resin films and sheets, metal foils, plates, and papers by lamination processing, regardless of whether the contents are visible or not, such as transparent, vapor-deposited, or printed, have been used as food packaging materials, industrial materials, and construction materials. Examples of lamination processing methods include the dry lamination method in which polyolefin resins are bonded to substrates via an anchor coating agent, and the extrusion lamination method in which polyolefin resins are melt-extruded and laminated onto substrates. Due to the ease of processing and the increasing demand for VOC-free materials in recent years, there is an increasing demand for the development of polyolefin resins that can be used with the extrusion lamination method. Polypropylene resins are superior in transparency, rigidity, surface gloss, and heat resistance compared to polyethylene resins. On the other hand, polypropylene resins have a linear molecular structure and the weight average molecular weight cannot be as large as that of polyethylene resins, so they have low melt tension. In the extrusion lamination method, which is molded at a relatively high temperature, resins with high melt tension have a small neck-in (the difference between the extruder die width and the extruded film width) and tend not to cause draw resonance (uneven thickness in the take-up direction or unstable phenomenon due to expansion and contraction of the edge) even at high molding speeds, but polypropylene resins with low melt tensions have been difficult to use in extrusion lamination molding.

[0003] Although the neck-in problem can be solved by blending low-density polyethylene or amorphous ethylene-α-olefin copolymer with polypropylene, there are problems such as inferior transparency and heat resistance, and insufficient improvement in the upper limit of molding speed at which draw resonance does not occur (hereinafter referred to as high-speed moldability) (see Patent Documents 1 and 2). As a method for improving high-speed moldability, a method of blending oil, polyethylene wax, etc. with a thermoplastic resin composition in which low-density polyethylene is blended with polypropylene (see Patent Documents 3 to 5), and a method of producing an extrusion laminate film using a thermoplastic resin composition in which low-density polyethylene is blended with polypropylene produced using a metallocene catalyst (see Patent Document 6) have been disclosed. Although these methods improve high-speed moldability, they do not solve the problem of sacrificing the advantages of polypropylene, such as transparency and heat resistance, because polyethylene is used.

[0004] On the other hand, a technology has been developed that focuses on the molecular structure of polypropylene resin itself to impart melt tension. For example, Patent Document 7 discloses a technology that aims to improve melt tension by introducing long chain branches into polypropylene using high-energy ionizing radiation. This method is not cost-effective because it requires large-scale equipment, and also has problems such as yellowing and a decrease in melt tension over time. Patent Document 8 discloses a method for introducing long chain branches into polypropylene resin using an organic peroxide. This method has problems such as contamination, odor, and yellowing due to decomposition products of the organic peroxide, and also problems such as the generation of a large amount of gel, which significantly deteriorates the appearance, when the amount of modification is increased in order to obtain a high melt tension.

[0005] Furthermore, in recent years, a technology has been disclosed in which propylene is polymerized in a single stage in the presence of a catalyst containing specific multiple metallocene catalyst components to obtain a polypropylene resin containing a long chain branched structure and exhibiting extremely high melt tension (see Patent Documents 9 and 10). However, since polypropylene resins having such high melt tension are prone to the draw resonance phenomenon, their high-speed moldability is insufficient. To solve this problem, a technique has been disclosed in which a polypropylene resin having a high melt tension is blended with 50 to 97% by mass of a polypropylene resin having an MFR of 1 to 50 g / 10 min to improve neck-in and high-speed moldability (see Patent Document 11). Although this method improves high-speed moldability compared to extrusion lamination of a polypropylene resin having a high melt tension itself, further improvement has been desired. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 8-259752 [Patent Document 2] JP 2006-56914 A [Patent Document 3] Special Publication No. 5-80492 [Patent Document 4] Special Publication No. 2003-528948 [Patent Document 5] International Publication No. 2009 / 069595 [Patent Document 6] JP 2001-323119 A [Patent Document 7] Japanese Patent Application Publication No. 62-121704 [Patent Document 8] Japanese Patent Application Publication No. 6-1577666 [Patent Document 9] JP 2009-57542 A [Patent Document 10] JP 2009-275207 A [Patent Document 11] JP 2014-55252 A Summary of the Invention [Problem to be solved by the invention]

[0007] In view of the above-mentioned problems in the conventional technology, an object (problem) of the present invention is to provide a polypropylene-based resin composition which exhibits small neck-in during high-temperature extrusion molding at, for example, 290°C or higher, excellent extrusion lamination processability at high speeds, for example, 200 m / min or higher, and excellent transparency, and a laminate using the polypropylene-based resin composition. [Means for solving the problem]

[0008] Means for Solving the Problems The present inventors have conducted extensive research to solve the above problems, and as a result have found that a polypropylene-based resin composition containing a specific polypropylene-based resin maintains high melt tension, and therefore has small neck-in during high-temperature extrusion molding, is excellent in high-speed extrusion lamination processability, and is also excellent in transparency, thereby completing the present invention.

[0009] The polypropylene resin composition of the present invention comprises a polypropylene resin (X1) having the following properties (X1-1) to (X1-6), A polypropylene resin (X2) having the following properties (X2-1) to (X2-6), The present invention is characterized by comprising: (X1-1) The MFR (230°C, load 2.16 kgf) is greater than 0.5 g / 10 min and less than 80 g / 10 min. (X1-2) The ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) obtained by GPC is 2.0 or more and 5.0 or less, and the ratio (Mz / Mw) of the Z average molecular weight (Mz) to the weight average molecular weight (Mw) is 2.0 or more and 5.0 or less. (X1-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 0.5 mass% or more. (X1-4) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation 1). log(MT170℃)≧-1.1×log(MFR)+2.0 (Equation 1) (X1-5) Branching index g'(Mz abs) is greater than or equal to 0.70 and less than or equal to 0.95. (X1-6) 13 The triad fraction (mm) of three consecutive propylene units measured by C-NMR is 95% or more. (X2-1) The MFR (230°C, load 2.16 kgf) is greater than 0.5 g / 10 min and less than 80 g / 10 min. (X2-2) The ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) obtained by GPC is 2.0 or more and 5.0 or less, and the ratio (Mz / Mw) of the Z average molecular weight (Mz) to the weight average molecular weight (Mw) is 2.0 or more and 5.0 or less. (X2-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 0.5 mass% or more. (X2-4) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation 1). log(MT170℃)≧-1.1×log(MFR)+2.0 (Equation 1) (X2-5) Branching index g'(Mz abs ) is between 0.70 and 0.95. (X2-6) 13 The triad fraction (mm) of three consecutive propylene units measured by C-NMR is 95% or more. However, the MFR of X1 <X2のMFR、X1のW 1M ≧X2W 1M It is.

[0010] The polypropylene resin composition of the present invention may further contain a polypropylene resin (Y) having the following properties (Y-1) to (Y-2). (Y-1) MFR (230°C, load 2.16 kgf) is 10 g / 10 min or more and 50 g / 10 min or less. (Y-2) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation A). log(MT170℃)<-1.1×log(MFR)+2.0 (Formula A)

[0011] The polypropylene resin composition of the present invention may contain 5% by mass to 30% by mass of polypropylene resin (X1), 5% by mass to 50% by mass of polypropylene resin (X2), and 20% by mass to 80% by mass of polypropylene resin (Y). (The total amount of polypropylene resin (X1), polypropylene resin (X2), and polypropylene resin (Y) is 100% by mass.)

[0012] The polypropylene resin composition of the present invention is characterized in that the polypropylene resin (X1) has the following properties (X1-1) and (X1-3): The polypropylene resin (X2) may have the following properties (X2-1) and (X2-3). (X1-1) The MFR (230°C, load 2.16 kgf) is greater than 0.5 g / 10 min and is 30 g / 10 min or less. (X1-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 2.5 mass% or more. (X2-1) The MFR (230°C, load 2.16 kgf) is greater than 30 g / 10 min and less than 80 g / 10 min. (X2-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 0.5 mass % or more and less than 2.5 mass %.

[0013] The polypropylene resin composition of the present invention is characterized in that the polypropylene resin (X1) has the following properties (X1-1) and (X1-3): The polypropylene resin (X2) may have the following properties (X2-1) and (X2-3). (X1-1) The MFR (230°C, load 2.16 kgf) is greater than 0.5 g / 10 min and is 10 g / 10 min or less. (X1-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 3.5 mass% or more. (X2-1) The MFR (230°C, load 2.16 kgf) is greater than 10 g / 10 min and is 80 g / 10 min or less. (X2-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 0.5 mass % or more and less than 3.5 mass %.

[0014] The polypropylene resin composition of the present invention may contain 2% by mass to 30% by mass of polypropylene resin (X1), 5% by mass to 98% by mass of polypropylene resin (X2), and 0% by mass to 80% by mass of polypropylene resin (Y). (The total amount of polypropylene resin (X1), polypropylene resin (X2), and polypropylene resin (Y) is 100% by mass.)

[0015] The polypropylene resin composition of the present invention may be used for extrusion lamination.

[0016] The method for producing a polypropylene resin composition of the present invention comprises the steps of: obtaining a polypropylene resin (X1) having the following properties (X1-1) to (X1-6); A step of obtaining a polypropylene resin (X2) having the following properties (X2-1) to (X2-6); a step of mixing or melt-kneading the polypropylene resin (X1) and the polypropylene resin (X2); The present invention is characterized by having the following. (X1-1) The MFR (230°C, load 2.16 kgf) is greater than 0.5 g / 10 min and less than 80 g / 10 min. (X1-2) The ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) obtained by GPC is 2.0 or more and 5.0 or less, and the ratio (Mz / Mw) of the Z average molecular weight (Mz) to the weight average molecular weight (Mw) is 2.0 or more and 5.0 or less. (X1-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 0.5 mass% or more. (X1-4) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation 1). log(MT170℃)≧-1.1×log(MFR)+2.0 (Equation 1) (X1-5) Branching index g'(Mz abs ) is between 0.70 and 0.95. (X1-6) 13 The triad fraction (mm) of three consecutive propylene units measured by C-NMR is 95% or more. (X2-1) The MFR (230°C, load 2.16 kgf) is greater than 0.5 g / 10 min and less than 80 g / 10 min. (X2-2) The ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) obtained by GPC is 2.0 or more and 5.0 or less, and the ratio (Mz / Mw) of the Z average molecular weight (Mz) to the weight average molecular weight (Mw) is 2.0 or more and 5.0 or less. (X2-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 0.5 mass% or more. (X2-4) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation 1). log(MT170℃)≧-1.1×log(MFR)+2.0 (Equation 1) (X2-5) Branching index g'(Mz abs ) is between 0.70 and 0.95. (X2-6) 13 The triad fraction (mm) of three consecutive propylene units measured by C-NMR is 95% or more. However, the MFR of X1 <X2のMFR、X1のW 1M ≧X2W 1M It is.

[0017] The method for producing the polypropylene-based resin composition of the present invention further includes a step of obtaining a polypropylene-based resin (Y) having the following properties (Y-1) to (Y-2): The mixing or melt-kneading step may be a step of mixing or melt-kneading the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene-based resin (Y). (Y-1) MFR (230°C, load 2.16 kgf) is 10 g / 10 min or more and 50 g / 10 min or less. (Y-2) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation A). log(MT170℃)<-1.1×log(MFR)+2.0 (Formula A)

[0018] In the method for producing the polypropylene-based resin composition of the present invention, the mixing or melt-kneading step may be a step of mixing or melt-kneading 5% by mass to 30% by mass of the polypropylene resin (X1), 5% by mass to 50% by mass of the polypropylene resin (X2), and 20% by mass to 80% by mass of the polypropylene-based resin (Y) (with the proviso that the total amount of the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene-based resin (Y) is 100% by mass).

[0019] In the method for producing a polypropylene-based resin composition of the present invention, the polypropylene resin (X1) has the following properties (X1-1) and (X1-3), The polypropylene resin (X2) may have the following properties (X2-1) and (X2-3). (X1-1) The MFR (230°C, load 2.16 kgf) is greater than 0.5 g / 10 min and is 30 g / 10 min or less. (X1-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 2.5 mass% or more. (X2-1) The MFR (230°C, load 2.16 kgf) is greater than 30 g / 10 min and less than 80 g / 10 min. (X2-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 0.5 mass % or more and less than 2.5 mass %.

[0020] In the method for producing a polypropylene-based resin composition of the present invention, the polypropylene resin (X1) has the following properties (X1-1) and (X1-3), The polypropylene resin (X2) may have the following properties (X2-1) and (X2-3). (X1-1) The MFR (230°C, load 2.16 kgf) is greater than 0.5 g / 10 min and is 10 g / 10 min or less. (X1-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 3.5 mass% or more. (X2-1) The MFR (230°C, load 2.16 kgf) is greater than 10 g / 10 min and is 80 g / 10 min or less. (X2-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 0.5 mass % or more and less than 3.5 mass %.

[0021] In the method for producing the polypropylene-based resin composition of the present invention, the mixing or melt-kneading step may be a step of mixing or melt-kneading 2 mass % to 30 mass % of the polypropylene resin (X1), 5 mass % to 98 mass % of the polypropylene resin (X2), and 0 mass % to 80 mass % of the polypropylene-based resin (Y) (with the proviso that the total amount of the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene-based resin (Y) is 100 mass %).

[0022] The method for producing the polypropylene resin composition of the present invention may be a method for producing a polypropylene resin composition for extrusion lamination.

[0023] The laminate of the present invention is a laminate including a base layer and a polypropylene-based resin composition layer, The polypropylene resin composition layer is characterized by containing a polypropylene resin (X1) having the following properties (X1-1) to (X1-6) and a polypropylene resin (X2) having the following properties (X2-1) to (X2-6). (X1-1) The MFR (230°C, load 2.16 kgf) is greater than 0.5 g / 10 min and less than 80 g / 10 min. (X1-2) The ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) obtained by GPC is 2.0 or more and 5.0 or less, and the ratio (Mz / Mw) of the Z average molecular weight (Mz) to the weight average molecular weight (Mw) is 2.0 or more and 5.0 or less. (X1-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 0.5 mass% or more. (X1-4) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation 1). log(MT170℃)≧-1.1×log(MFR)+2.0 (Equation 1) (X1-5) Branching index g'(Mz abs ) is between 0.70 and 0.95. (X1-6) 13 The triad fraction (mm) of three consecutive propylene units measured by C-NMR is 95% or more. (X2-1) The MFR (230°C, load 2.16 kgf) is greater than 0.5 g / 10 min and less than 80 g / 10 min. (X2-2) The ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) obtained by GPC is 2.0 or more and 5.0 or less, and the ratio (Mz / Mw) of the Z average molecular weight (Mz) to the weight average molecular weight (Mw) is 2.0 or more and 5.0 or less. (X2-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 0.5 mass% or more. (X2-4) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation 1). log(MT170℃)≧-1.1×log(MFR)+2.0 (Equation 1) (X2-5) Branching index g'(Mz abs ) is between 0.70 and 0.95. (X2-6) 13The triad fraction (mm) of three consecutive propylene units measured by C-NMR is 95% or more. However, the MFR of X1 <X2のMFR、X1のW 1M ≧X2W 1M It is.

[0024] In the laminate of the present invention, the polypropylene resin composition layer may further contain a polypropylene resin (Y) having the following properties (Y-1) to (Y-2). (Y-1) MFR (230°C, load 2.16 kgf) is 10 g / 10 min or more and 50 g / 10 min or less. (Y-2) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation A). log(MT170℃)<-1.1×log(MFR)+2.0 (Formula A)

[0025] In the laminate of the present invention, the polypropylene resin composition layer may contain 5% by mass to 30% by mass of the polypropylene resin (X1), 5% by mass to 50% by mass of the polypropylene resin (X2), and 20% by mass to 80% by mass of the polypropylene resin (Y). (The total amount of the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene resin (Y) is 100% by mass.)

[0026] In the laminate of the present invention, the polypropylene resin (X1) has the following properties (X1-1) and (X1-3), The polypropylene resin (X2) may have the following properties (X2-1) and (X2-3). (X1-1) The MFR (230°C, load 2.16 kgf) is greater than 0.5 g / 10 min and is 30 g / 10 min or less. (X1-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 2.5 mass% or more. (X2-1) The MFR (230°C, load 2.16 kgf) is greater than 30 g / 10 min and less than 80 g / 10 min. (X2-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 0.5 mass % or more and less than 2.5 mass %.

[0027] In the laminate of the present invention, the polypropylene resin (X1) has the following properties (X1-1) and (X1-3), The polypropylene resin (X2) may have the following properties (X2-1) and (X2-3). (X1-1) The MFR (230°C, load 2.16 kgf) is greater than 0.5 g / 10 min and is 10 g / 10 min or less. (X1-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 3.5 mass% or more. (X2-1) The MFR (230°C, load 2.16 kgf) is greater than 10 g / 10 min and is 80 g / 10 min or less. (X2-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 0.5 mass % or more and less than 3.5 mass %.

[0028] In the laminate of the present invention, the polypropylene resin composition layer may contain 2% by mass to 30% by mass of the polypropylene resin (X1), 5% by mass to 98% by mass of the polypropylene resin (X2), and 0% by mass to 80% by mass of the polypropylene resin (Y). (The total amount of the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene resin (Y) is 100% by mass.)

[0029] The method for producing a laminate of the present invention is a method for producing a laminate including a base layer and a polypropylene-based resin composition layer, The method comprises a step of extrusion laminating a mixture or melt-kneaded product of a polypropylene resin (X1) having the following properties (X1-1) to (X1-6) and a polypropylene resin (X2) having the following properties (X2-1) to (X2-6) on at least one surface of a base layer to form the polypropylene resin composition layer. (X1-1) The MFR (230°C, load 2.16 kgf) is greater than 0.5 g / 10 min and less than 80 g / 10 min. (X1-2) The ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) obtained by GPC is 2.0 or more and 5.0 or less, and the ratio (Mz / Mw) of the Z average molecular weight (Mz) to the weight average molecular weight (Mw) is 2.0 or more and 5.0 or less. (X1-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 0.5 mass% or more. (X1-4) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation 1). log(MT170℃)≧-1.1×log(MFR)+2.0 (Equation 1) (X1-5) Branching index g'(Mz abs ) is between 0.70 and 0.95. (X1-6) 13 The triad fraction (mm) of three consecutive propylene units measured by C-NMR is 95% or more. (X2-1) The MFR (230°C, load 2.16 kgf) is greater than 0.5 g / 10 min and less than 80 g / 10 min. (X2-2) The ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) obtained by GPC is 2.0 or more and 5.0 or less, and the ratio (Mz / Mw) of the Z average molecular weight (Mz) to the weight average molecular weight (Mw) is 2.0 or more and 5.0 or less. (X2-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 0.5 mass% or more. (X2-4) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation 1). log(MT170℃)≧-1.1×log(MFR)+2.0 (Equation 1) (X2-5) Branching index g'(Mz abs ) is between 0.70 and 0.95. (X2-6) 13 The triad fraction (mm) of three consecutive propylene units measured by C-NMR is 95% or more. However, the MFR of X1 <X2のMFR、X1のW 1M ≧X2W 1M It is.

[0030] In the method for producing a laminate of the present invention, the step of forming the polypropylene-based resin composition layer may be a step of extrusion laminating, on at least one surface of the base layer, a mixture or a melt-kneaded product of the polypropylene resin (X1), the polypropylene resin (X2), and a polypropylene-based resin (Y) further having the following properties (Y-1) to (Y-2), thereby forming the polypropylene-based resin composition layer. (Y-1) MFR (230°C, load 2.16 kgf) is 10 g / 10 min or more and 50 g / 10 min or less. (Y-2) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation A). log(MT170℃)<-1.1×log(MFR)+2.0 (Formula A)

[0031] In the method for producing a laminate of the present invention, the step of forming the polypropylene-based resin composition layer may be a step of forming the polypropylene-based resin composition layer by extrusion laminating a mixture or melt-kneaded product of 5% by mass to 30% by mass of the polypropylene resin (X1), 5% by mass to 50% by mass of the polypropylene resin (X2), and 20% by mass to 80% by mass of the polypropylene resin (Y) (wherein the total amount of the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene resin (Y) is 100% by mass).

[0032] In the method for producing a laminate of the present invention, the polypropylene resin (X1) has the following properties (X1-1) and (X1-3), The polypropylene resin (X2) may have the following properties (X2-1) and (X2-3). (X1-1) The MFR (230°C, load 2.16 kgf) is greater than 0.5 g / 10 min and is 30 g / 10 min or less. (X1-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 2.5 mass% or more. (X2-1) The MFR (230°C, load 2.16 kgf) is greater than 30 g / 10 min and less than 80 g / 10 min. (X2-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 0.5 mass % or more and less than 2.5 mass %.

[0033] In the method for producing a laminate of the present invention, the polypropylene resin (X1) has the following properties (X1-1) and (X1-3), The polypropylene resin (X2) may have the following properties (X2-1) and (X2-3). (X1-1) The MFR (230°C, load 2.16 kgf) is greater than 0.5 g / 10 min and is 10 g / 10 min or less. (X1-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 3.5 mass% or more. (X2-1) The MFR (230°C, load 2.16 kgf) is greater than 10 g / 10 min and is 80 g / 10 min or less. (X2-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 0.5 mass % or more and less than 3.5 mass %.

[0034] In the method for producing a laminate of the present invention, the step of forming the polypropylene-based resin composition layer may be a step of forming the polypropylene-based resin composition layer by extrusion laminating a mixture or melt-kneaded product of 2% by mass to 30% by mass of the polypropylene resin (X1), 5% by mass to 98% by mass of the polypropylene resin (X2), and 0% by mass to 80% by mass of the polypropylene resin (Y) (wherein the total amount of the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene resin (Y) is 100% by mass). Effect of the Invention

[0035] The polypropylene resin composition of the present invention has a small neck-in during high-temperature extrusion molding at, for example, 290° C. or higher, and is excellent in extrusion lamination processability at a high speed of, for example, 200 m / min or higher. Furthermore, a laminate obtained by using the polypropylene resin composition has excellent transparency. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0036] The following describes in detail the embodiments of the present invention, item by item. In this specification, the term "to" indicates a range of values, and includes the values ​​before and after the range as the lower and upper limits. The following description of the constituent elements is an example of the embodiment of the present invention, and the present invention is not limited to these contents in any way.

[0037] 1. Polypropylene resin composition The polypropylene resin composition of the present invention comprises a polypropylene resin (X1) having the following properties (X1-1) to (X1-6), A polypropylene resin (X2) having the following properties (X2-1) to (X2-6), The present invention is characterized by comprising: (X1-1) The MFR (230°C, load 2.16 kgf) is greater than 0.5 g / 10 min and less than 80 g / 10 min. (X1-2) The ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) obtained by GPC is 2.0 or more and 5.0 or less, and the ratio (Mz / Mw) of the Z average molecular weight (Mz) to the weight average molecular weight (Mw) is 2.0 or more and 5.0 or less. (X1-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 0.5 mass% or more. (X1-4) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation 1). log(MT170℃)≧-1.1×log(MFR)+2.0 (Equation 1) (X1-5) Branching index g'(Mz abs ) is between 0.70 and 0.95. (X1-6) 13 The triad fraction (mm) of three consecutive propylene units measured by C-NMR is 95% or more. (X2-1) The MFR (230°C, load 2.16 kgf) is greater than 0.5 g / 10 min and less than 80 g / 10 min. (X2-2) The ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) obtained by GPC is 2.0 or more and 5.0 or less, and the ratio (Mz / Mw) of the Z average molecular weight (Mz) to the weight average molecular weight (Mw) is 2.0 or more and 5.0 or less. (X2-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 0.5 mass% or more. (X2-4) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation 1). log(MT170℃)≧-1.1×log(MFR)+2.0 (Equation 1) (X2-5) Branching index g'(Mz abs ) is between 0.70 and 0.95. (X2-6) 13 The triad fraction (mm) of three consecutive propylene units measured by C-NMR is 95% or more. However, the MFR of X1 <X2のMFR、X1のW 1M ≧X2W 1M It is. The difference between the MFR of X2 and the MFR of X1 may be adjusted as appropriate, but from the viewpoint of easily obtaining the effects of the present invention, it may be 9.5 g / 10 min or more, 12 g / 10 min or more, 20 g / 10 min or more, or 29.5 g / 10 min or more, or may be 60 g / 10 min or less.

[0038] The polypropylene resin composition of the present invention may further contain a polypropylene resin (Y) having the following properties (Y-1) to (Y-2). (Y-1) MFR (230°C, load 2.16 kgf) is 10 g / 10 min or more and 50 g / 10 min or less. (Y-2) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation A). log(MT170℃)<-1.1×log(MFR)+2.0 (Formula A)

[0039] Both the polypropylene resin (X1) and the polypropylene resin (X2) having the above characteristics are long-chain branched polypropylene resins with high stereoregularity and containing a specific amount of high molecular weight components, and satisfy the above formula (1), and therefore have sufficient melt tension. In such a polypropylene resin having sufficient melt tension, by mixing the polypropylene resin (X1) having a relatively high molecular weight component and low fluidity within a specific range with the polypropylene resin (X2) having a relatively low molecular weight component and high fluidity, the polypropylene resin composition of the present invention can be imparted with fluidity while maintaining a high melt tension, so that the neck-in in high-temperature extrusion molding is likely to be small, and the extrusion lamination processability at high speed is likely to be excellent, and the transparency is likely to be excellent. The polypropylene resin (X2) having a relatively low high molecular weight component and high fluidity can be the fluidity imparting component. The fluidity-imparting component does not have to be a long-chain branched polypropylene resin containing a specific amount of a high molecular weight component. By further combining and mixing the polypropylene resin (Y) as the fluidity-imparting component, high-speed moldability tends to be improved.

[0040] 1-1. Polypropylene resin (X1) The polypropylene resin (X1) has the properties (X1-1) to (X1-6).

[0041] 1-1-1. Property (X1-1): MFR (230℃, load 2.16kgf) is more than 0.5g / 10min and 80g / 10min or less. However, the MFR of polypropylene resin (X1) is less than the MFR of polypropylene resin (X2). In a preferred embodiment, the property (X1-1) may have an MFR (230°C, load 2.16 kgf) of more than 0.5 g / 10 min and not more than 30 g / 10 min, and in a more preferred embodiment, an MFR (230°C, load 2.16 kgf) of more than 0.5 g / 10 min and not more than 10 g / 10 min. MFR is an index of melt fluidity, and the higher the molecular weight of a polymer, the smaller this value becomes. Conversely, the lower the molecular weight, the larger this value becomes. Since the melt fluidity is improved and the load on the extruder during extrusion molding is easily suppressed, the MFR of X1 is greater than 0.5 g / 10 min, preferably greater than 1 g / 10 min, greater than 2 g / 10 min, and more preferably greater than 3 g / 10 min. The MFR may be greater than 8 g / 10. On the other hand, in order to improve the melt tension and formability such as extrusion laminate formability, the MFR of X1 may be 30 g / 10 min or less, preferably 25 g / 10 min or less, more preferably 20 g / 10 min or less, even more preferably 10 g / 10 min or less, still more preferably 9.5 g / 10 min or less, and particularly preferably 9 g / 10 min or less. In the present invention, the melt flow rate (MFR) is a value measured in accordance with JIS K7210 "Test method for melt mass flow rate (MFR) and melt volume flow rate (MVR) of plastics-thermoplastics" under test conditions of 230°C and a load of 2.16 kgf. The melt flow rate (MFR) can be easily adjusted by changing the polymerization temperature or pressure, or, as a general method, by adding a chain transfer agent such as hydrogen during polymerization.

[0042] 1-1-2. Characteristics (X1-2): The ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) obtained by GPC is 2.0 or more and 5.0 or less, and the Z average molecular weight (M z The ratio (Mz / Mw) of the polymerizable monomer to the weight average molecular weight (Mw) is 2.0 or more and 5.0 or less.

[0043] Mw / Mn is an index showing the spread of the molecular weight distribution, and the larger this value, the wider the molecular weight distribution. If Mw / Mn is too small, the amount of low molecular weight components may decrease, and the melt fluidity may deteriorate. Therefore, Mw / Mn is 2.0 or more, preferably 2.1 or more, and more preferably 2.2 or more. On the other hand, if Mw / Mn is too large, the amount of high molecular weight components may relatively increase, and the melt fluidity may deteriorate. Therefore, Mw / Mn is 5.0 or less, and preferably 4.9 or less. Mw / Mn may be 4.6 or less, or may be 4.2 or less. Similarly, Mz / Mw is an index showing the spread of the molecular weight distribution, and is an index showing the spread on the high molecular weight side compared to Mw / Mn. The larger these values ​​are, the broader the molecular weight distribution is toward the high molecular weight side. If Mz / Mw is too small, the amount of high molecular weight components may decrease, and the melt tension may decrease. Therefore, Mz / Mw is 2.0 or more, preferably 2.1 or more, and more preferably 2.2 or more. On the other hand, if Mz / Mw is too large, the amount of high molecular weight components may increase relatively, and the melt fluidity may deteriorate. Therefore, Mz / Mw is 5.0 or less, preferably 4.0 or less, and more preferably 3.6 or less. Mz / Mw may be 3.5 or less. The average molecular weight and molecular weight distribution (Mz, Mw, Mn, Mw / Mn, Mz / Mw) of the polypropylene resin (X1) measured by GPC can be easily adjusted by changing the temperature and pressure conditions of propylene polymerization, or, most commonly, by adding a chain transfer agent such as hydrogen during propylene polymerization. Furthermore, they can be controlled by changing the type of metallocene complex used, or the ratio of the amounts when two or more types of complexes are used. The polypropylene resin (X1) of the present invention has an Mw of preferably 200,000 or more and 500,000 or less from the viewpoint of the balance between melt fluidity and melt tension. From the viewpoint of melt tension, the Mw is preferably 230,000 or more and more preferably 250,000 or more, and from the viewpoint of melt fluidity, it is preferably 450,000 or less and more preferably 400,000 or less. Ten thousand It is preferable that:

[0044] 1-1-3. Characteristics (X1-3): The ratio of components with molecular weights of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 0.5 mass% or more. However, W of polypropylene resin (X1) is 1M ≧W of polypropylene resin (X2) 1M In a preferred embodiment, the characteristic (X1-3) is the ratio of components having a molecular weight of 1 million or more (W 1M ) may be 2.5% by mass or more, and in a more preferred embodiment, may be 3.5% by mass or more.

[0045] As mentioned above, the melt tension decreases as the amount of high molecular weight components decreases. 1M is 0.5% by mass or more, may be 2.5% by mass or more, preferably 3.0% by mass or more, more preferably 3.5% by mass or more, and particularly preferably 4.0% by mass or more. 1M The upper limit of the content is not particularly limited, but may be 10.0 mass % or less from the viewpoint of melt fluidity. In the present invention, W 1Mis defined as the integral value up to a molecular weight (M) of 1 million (log(M)=6.0) in an integrated molecular weight distribution curve (total amount normalized to 1) obtained by GPC, subtracted from 1, and multiplied by 100. W 1M For example, in a method using a catalyst containing a plurality of metallocene complexes, one of the metallocene complexes is selected as one capable of producing a high molecular weight polymer, and the molecular weight can be easily adjusted by controlling the amount of the other metallocene complex that produces a low molecular weight polymer, the amount of hydrogen added during polymerization, and the polymerization temperature.

[0046] Mz, Mw, Mn, Mw / Mn, Mz / Mw, and W as defined above 1M The values ​​are all obtained by gel permeation chromatography (GPC), and the details of the measurement method and measuring equipment are as follows. Apparatus: Waters GPC (ALC / GPC, 150C) Detector: FOXBORO MIRAN, 1A, IR detector (measurement wavelength: 3.42 μm) Column: Showa Denko AD806M / S (3 columns) Mobile phase solvent: o-dichlorobenzene (ODCB) Measurement temperature: 140℃ Flow rate: 1.0mL / min Injection volume: 0.2mL The sample is prepared by preparing a 1 mg / mL solution using the sample and ODCB (containing 0.5 mg / mL dibutylhydroxytoluene (BHT)) and dissolving the solution at 140° C. for about 1 hour. The retention volume obtained by GPC measurement is converted to molecular weight using a calibration curve prepared in advance using standard polystyrene. The standard polystyrene used is the following brand manufactured by Tosoh Corporation. Brand Name: F380, F288, F128, F80, F40, F20, F10, F4, F1, A5000, A2500, A1000 A calibration curve was created by injecting 0.2 mL of a solution of each of the ODCB (containing 0.5 mg / mL BHT) at 0.5 mg / mL. The calibration curve was created using a cubic equation obtained by approximating the curve using the least squares method. Viscosity formula used for conversion to molecular weight: [η] = K × M α The following numerical values ​​are used: PS:K = 1.38 x 10 -4 , α=0.7 PP:K = 1.03 x 10 -4 , α=0.78

[0047] 1-1-4. Property (X1-4): The melt tension (MT170°C) measured at 170°C (unit: g) satisfies the requirement of the following formula 1. log(MT170℃)≧-1.1×log(MFR)+2.0 (Equation 1)

[0048] Here, MT170°C represents the melt tension measured using Capillograph 1B manufactured by Toyo Seiki Seisakusho Co., Ltd. under the following conditions: capillary diameter 2.0 mm, length 40 mm, cylinder diameter 9.55 mm, cylinder extrusion speed 20 mm / min, take-up speed 4.0 m / min, temperature 170°C, and the unit is grams. Note that MT230°C shown in the examples below represents the melt tension measured under the above-mentioned measurement conditions, temperature 230°C. However, if the MT of the sample is extremely high, the resin may break at a take-up speed of 4.0 m / min. In such a case, the take-up speed is reduced, and the tension at the maximum speed at which take-up is possible is taken as MT. The measurement conditions and units of MFR are as described above. This provision is an index for polypropylene resin (X1) to have sufficient melt tension, and since MT generally has a correlation with MFR, it is described by a relational formula with MFR. If the polypropylene resin (X1) satisfies the above formula 1, not only can the neck-in be reduced, but also stress is uniformly propagated in the molten film, thereby suppressing the phenomenon of unevenness in film thickness, known as the resonance phenomenon, and the instability caused by expansion and contraction of the edges. It is more preferable that the following formula (2) is satisfied, and it is even more preferable that the following formula (3) is satisfied. log(MT170℃)≧-1.1×log(MFR)+2.3 (Equation 2) log(MT170℃)≧-1.1×log(MFR)+2.5 (Equation 3)

[0049] There is no particular need to set an upper limit for MT, but when MT exceeds 50 g, the take-up speed becomes extremely slow and measurement becomes difficult in the above measurement method. In such cases, it is considered that the extensibility of the resin is also reduced, so that the upper limit is preferably 45 g or less, 40 g or less, more preferably 35 g or less, and even more preferably 30 g or less. In order to satisfy the above condition (formula 1), for example, the amount of long chain branches in the polypropylene resin (X1) may be increased to increase the melt tension, and this can be achieved by selecting preferred metallocene catalysts described below, combining them, and controlling the quantitative ratio thereof, as well as the prepolymerization conditions, to introduce a large amount of long chain branches.

[0050] 1-1-5. Characteristics (X1-5): Branching index g' (Mz abs ) is between 0.70 and 0.95.

[0051] The branching index g' can be cited as a direct indicator of whether the polypropylene resin (X1) has branches. g' is given by the ratio of the intrinsic viscosity [η]br of a polymer having a long chain branching structure to the intrinsic viscosity [η]lin of a linear polymer having the same molecular weight, that is, [η]br / [η]lin, and takes a value smaller than 1 when a long chain branching structure is present. Rope Polypropylene with g'<1 means that it is "long chain branched polypropylene." The definitions are described, for example, in "Developments in Polymer Characterization-4" (JV Dawkins ed. Applied Science Publishers, 1983), and are known guidelines for those skilled in the art.

[0052] g' can be obtained as a function of the absolute molecular weight Mabs, for example, by using GPC equipped with a light scattering meter and a viscometer as detectors as described below. The polypropylene resin (X1) used in the present invention has a Z-average molecular weight Mz of absolute molecular weight Mabs determined by light scattering. abs g'(Mz abs ) is preferably 0.72 or more, more preferably 0.75 or more, even more preferably 0.80 or more, and is preferably 0.90 or less, more preferably 0.89 or less, even more preferably 0.88 or less.

[0053] In addition, a branched polymer having a comb-shaped chain structure is preferable because the degree of decrease in melt tension is small when kneaded at a high temperature of 290°C or higher or when kneading is repeated, and therefore the deterioration of extrusion lamination moldability (increase in neck-in or occurrence of resonance phenomenon during slow take-up) is unlikely to occur. A specific method for calculating g' is as follows. The GPC apparatus used is Alliance GPCV2000 manufactured by Waters, equipped with a differential refractometer (RI) and a viscosity detector (Viscometer). The light scattering detector used is a multi-angle laser light scattering detector (MALLS) DAWN-E manufactured by Wyatt Technology. The detectors are connected in the order of MALLS, RI, and Viscometer. The mobile phase solvent is 1,2,4-trichlorobenzene (with the antioxidant Irganox1076 manufactured by BASF Japan added at a concentration of 0.5 mg / mL). The flow rate is 1 mL / min, and two Tosoh GMHHR-H(S) HT columns are connected together. The temperatures of the columns, sample injection section, and each detector are 140° C. The sample concentration is 1 mg / mL, and the injection volume (sample loop volume) is 0.2175 mL. To calculate the absolute molecular weight (Mabs), the root mean square radius of gyration (Rg) obtained from MALLS, and the intrinsic viscosity ([η]) obtained from Viscometer, the data processing software ASTRA (version 4.73.04) attached to MALLS is used, and calculations are performed with reference to the following literature. References: 1. “Developments in Polymer Characterization-4” (JV Dawkins ed. Applied Science Publishers, 1983. Chapter 1.) 2.Polymer, 45, 6495-6505(2004) 3.Macromolecules, 33, 2424-2436(2000) 4.Macromolecules, 33, 6945-6952(2000)

[0054] [Calculation of branching index (g')] The branching index (g') is calculated as the ratio ([η]br / [η]lin) of the intrinsic viscosity ([η]br) obtained by measuring a sample with the above-mentioned Viscometer to the intrinsic viscosity ([η]lin) obtained by separately measuring a linear polymer. When a long chain branch structure is introduced into a polymer molecule, the radius of gyration becomes smaller compared to a linear polymer molecule of the same molecular weight. Since a smaller radius of gyration results in a smaller intrinsic viscosity, the ratio ([η]br / [η]lin) of the intrinsic viscosity of the branched polymer to the intrinsic viscosity ([η]lin) of the linear polymer of the same molecular weight becomes smaller as the long chain branch structure is introduced. Therefore, when the branching index (g'=[η]br / [η]lin) is a value smaller than 1, it means that the polymer has a long chain branched structure. Here, a commercially available homopolypropylene (Novatec PP (registered trademark) grade name: FY6, manufactured by Japan Polypropylene Corporation) is used as the linear polymer for obtaining [η]lin. It is known that the logarithm of [η]lin of a linear polymer has a linear relationship with the logarithm of the molecular weight, as known as the Mark-Houwink-Sakurada equation, and therefore the value of [η]lin can be obtained by appropriately extrapolating to the low molecular weight side or the high molecular weight side.

[0055] The branching index g' can be set to 0.70 or more and 0.95 or less by introducing a large amount of long chain branches. For example, this can be achieved by selecting preferred metallocene catalysts, combining them, and controlling the amount ratio thereof, as well as the prepolymerization conditions.

[0056] 1-1-6.(X1-6): 13 The triad fraction of three consecutive propylene units (hereinafter sometimes referred to as the mm fraction) measured by C-NMR is 95% or more.

[0057] The polypropylene resin (X1) used in the present invention preferably has high stereoregularity. The degree of stereoregularity is as follows: 13 It can be evaluated by C-NMR. 13 It is preferable that the mm fraction of propylene unit triads obtained by C-NMR has a stereoregularity of 95% or more. The mm fraction is the proportion of propylene unit triads in which the direction of the methyl branch in each propylene unit is the same among any propylene unit triads consisting of head-to-tail bonds in a polymer chain, and the upper limit is 100%. This mm fraction is a value indicating that the three-dimensional structure of the methyl group in the polypropylene molecular chain is isotactically controlled, and the higher the mm fraction, the higher the degree of control. If the mm fraction is smaller than this value, the elastic modulus of the product decreases, and the polypropylene resin composition layer of the laminate tends to be inferior in the effect of imparting surface scratch resistance. Therefore, the mm fraction is 95% or more, more preferably 96% or more, and further preferably 97% or more.

[0058] In addition, 13 The details of the method for measuring the mm fraction of propylene unit triads by C-NMR are as follows. 375 mg of sample is completely dissolved in 2.5 ml of deuterated 1,1,2,2-tetrachloroethane in an NMR sample tube (10φ), and then measured at 125°C using the proton complete decoupling method. The chemical shift is set to 74.2 ppm for the central peak of the three peaks of deuterated 1,1,2,2-tetrachloroethane. The chemical shifts of the other carbon peaks are based on this. Flip angle: 90 degrees Pulse Interval: 10 seconds ·Resonance frequency: 100MHz or more -Number of times: 10,000 or more Observation range: -20ppm to 179ppm Number of data points: 32768

[0059] The mm fraction of propylene unit triads is 13 It can be calculated by substituting the integrated intensity of the 13C signal measured by C-NMR measurement into the following equation. mm(%)=Imm×100 / (Imm+3×Imrrm) Here, Imm=I 23.6~21.1 , Imrrm=I 19.8~19.7 This is the quantity indicated by: To calculate the mm fraction of propylene unit triads 13 The C-NMR measurement can be performed in the same manner as the above measurement. Spectral assignments can be made with reference to Polymer Jounral, vol. 16, p. 717 (1984), Asakura Publishing, Macromolecules, vol. 8, p. 687 (1975), and Polymer, vol. 30, p. 1350 (1989).

[0060] The mm fraction can be increased to 95% or more by using a polymerization catalyst that produces a highly crystalline polymer, and this can be achieved by polymerization using a preferred metallocene catalyst described below.

[0061] 1-1-7. Manufacturing method of polypropylene resin (X1) The polypropylene resin (X1) is not particularly limited in the production method as long as it satisfies the above-mentioned properties (X1-1) to (X1-6). As described above, the polypropylene resin (X1) preferably has high stereoregularity, a relatively wide molecular weight distribution, a branching index g'(Mz abs A preferred production method for satisfying the conditions such as the range of molecular weight distribution, high melt tension, etc. is a method using a macromer copolymerization method utilizing a combination of metallocene catalysts. An example of such a method is the method disclosed in JP 2009-57542 A. This method is a method for producing polypropylene having a structure with long chain branches using a catalyst that combines a catalyst component having a specific structure capable of generating a macromer with a catalyst component having a specific structure capable of copolymerizing a macromer. This method makes it possible to produce a polypropylene resin having a structure with long chain branches and having the desired physical properties by an industrially effective method such as bulk polymerization or gas phase polymerization, particularly by single-stage polymerization under practical pressure and temperature conditions, and by using hydrogen as a molecular weight modifier.

[0062] The polypropylene resin (X1) according to the present invention may be a propylene homopolymer obtained by homopolymerizing a propylene monomer, or a propylene-α-olefin copolymer obtained by copolymerizing a propylene monomer with an α-olefin comonomer having 2 to 20 carbon atoms other than propylene, such as ethylene and / or 1-butene. The shape of the polypropylene resin (X1) is not particularly limited, and it may be in the form of a powder or a particulate product thereof.

[0063] The polypropylene resin (X1) according to the present invention may be obtained by mixing other additional components described later as necessary using a Henschel mixer, a V blender, a ribbon blender, a tumbler blender or the like, and may be kneaded into granules as necessary using a kneading machine such as a single-screw extruder, a multi-screw extruder, a kneader or a Banbury mixer.

[0064] 1-2. Polypropylene resin (X2) The polypropylene resin (X2) has the properties (X2-1) to (X2-6).

[0065] 1-2-1. Property (X2-1): MFR (230°C, load 2.16 kgf) is more than 0.5 g / 10 min and not more than 80 g / 10 min. However, the MFR of polypropylene resin (X1) is less than the MFR of polypropylene resin (X2). As for property (X2-1), in a preferred embodiment, MFR (230°C, load 2.16 kgf) may be more than 10 g / 10 min and not more than 80 g / 10 min., and in a more preferred embodiment, MFR (230°C, load 2.16 kgf) may be more than 30 g / 10 min and not more than 80 g / 10 min. MFR is an index of melt fluidity, and the higher the molecular weight of a polymer, the smaller this value becomes. Conversely, the lower the molecular weight, the larger this value becomes. Since the melt fluidity is improved and the load on the extruder during extrusion molding is easily suppressed, the MFR of X2 is more than 0.5 g / 10 min, preferably more than 10 g / 10 min, more preferably more than 15 g / 10 min, even more preferably more than 30 g / 10 min, and particularly preferably more than 40 g / 10 min. On the other hand, in order to improve the melt tension and formability such as extrusion lamination formability, the MFR of X2 is 80 g / 10 min or less, preferably 70 g / 10 min or less, and more preferably 65 g / 10 min or less. In the present invention, the melt flow rate (MFR) was measured by the same method as that used for the polypropylene resin (X1). The melt flow rate (MFR) can be easily adjusted by changing the polymerization temperature or pressure, or, as a general method, by adding a chain transfer agent such as hydrogen during polymerization.

[0066] 1-2-2. Property (X2-2): The ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) obtained by GPC is 2.0 or more and 5.0 or less, and the Z average molecular weight (M z The ratio (Mz / Mw) of the polymerizable monomer to the weight average molecular weight (Mw) is 2.0 or more and 5.0 or less.

[0067] Mw / Mn is an index showing the spread of the molecular weight distribution, and the larger this value, the wider the molecular weight distribution. If Mw / Mn is too small, the amount of low molecular weight components decreases and the melt fluidity deteriorates. Therefore, Mw / Mn is 2.0 or more, preferably 2.1 or more, and more preferably 2.2 or more. On the other hand, if Mw / Mn is too large, the amount of high molecular weight components increases relatively, and the melt fluidity deteriorates. Therefore, Mw / Mn is 5.0 or less, preferably 4.6 or less, and more preferably 4.2 or less. Similarly, Mz / Mw is an index showing the spread of the molecular weight distribution, and is an index showing the spread on the high molecular weight side compared to Mw / Mn. The larger these values ​​are, the broader the molecular weight distribution is toward the high molecular weight side. If Mz / Mw is too small, the amount of high molecular weight components decreases and the melt tension decreases. Therefore, Mz / Mw is 2.0 or more, preferably 2.1 or more, and more preferably 2.2 or more. On the other hand, if Mz / Mw is too large, the amount of high molecular weight components increases relatively, and the melt fluidity deteriorates. Therefore, Mz / Mw is 5.0 or less, preferably 4.3 or less, and more preferably 4.0 or less. Mz / Mw may be 3.5 or less. The average molecular weight and molecular weight distribution (Mz, Mw, Mn, Mw / Mn, Mz / Mw) of the polypropylene resin (X2) measured by GPC can be easily adjusted by changing the temperature and pressure conditions of propylene polymerization, or, most commonly, by adding a chain transfer agent such as hydrogen during propylene polymerization. Furthermore, they can be controlled by changing the type of metallocene complex used, or the ratio of the amounts when two or more types of complexes are used. The polypropylene resin (X2) of the present invention preferably has an Mw of 150,000 or more and 200,000 or less from the viewpoint of the balance between melt fluidity and melt tension. From the viewpoint of melt tension, the Mw is preferably 160,000 or more, and from the viewpoint of melt fluidity, the Mw is preferably 190,000 or less.

[0068] 1-2-3. Characteristics (X2-3): The ratio of components with molecular weights of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M) is 0.5 mass% or more. However, W of polypropylene resin (X1) is 1M ≧W of polypropylene resin (X2) 1M In a preferred embodiment, the characteristic (X2-3) is the ratio of components having a molecular weight of 1 million or more (W 1M ) may be 0.5% by mass or more and less than 3.5% by mass, and in a more preferred embodiment, the proportion of components having a molecular weight of 1 million or more in an integral molecular weight distribution curve obtained by GPC (W 1M ) may be 0.5 mass % or more and less than 2.5 mass %.

[0069] As mentioned above, the melt tension decreases as the amount of high molecular weight components decreases. 1M is 0.5% by mass or more, preferably 1.0% by mass or more, and more preferably 1.5% by mass or more. 1M As W becomes larger, the melt fluidity becomes lower. 1M is preferably less than 3.5% by mass, more preferably 3.0% by mass or less, even more preferably less than 2.5% by mass, and particularly preferably 2.0% by mass or less. In the present invention, W 1M is defined as the integral value up to a molecular weight (M) of 1 million (log(M)=6.0) in an integrated molecular weight distribution curve (total amount normalized to 1) obtained by GPC, subtracted from 1, and multiplied by 100. W 1M For example, in a method using a catalyst containing a plurality of metallocene complexes, one of the metallocene complexes is selected as one capable of producing a high molecular weight polymer, and the molecular weight can be easily adjusted by controlling the amount of the other metallocene complex that produces a low molecular weight polymer, the amount of hydrogen added during polymerization, and the polymerization temperature.

[0070] Mz, Mw, Mn, Mw / Mn, Mz / Mw, and W as defined above 1MThe values ​​are all obtained by gel permeation chromatography (GPC), and the measuring method and measuring equipment are the same as those used for polypropylene resin (X1).

[0071] 1-2-4. Property (X2-4): The melt tension (MT170°C) measured at 170°C (unit: g) satisfies the requirement of the following formula 1. log(MT170℃)≧-1.1×log(MFR)+2.0 (Equation 1)

[0072] Here, MT170° C. and MT230° C. are melt tensions measured by the same method as that used for the polypropylene resin (X1), and the measurement conditions and units are as described above. This provision is an index for polypropylene resin (X2) to have sufficient melt tension, and since MT generally has a correlation with MFR, it is described by a relational formula with MFR. If the polypropylene resin (X2) satisfies the above formula (1), not only can the neck-in be reduced, but also stress is uniformly transmitted to the molten film, thereby suppressing the phenomenon of unevenness in film thickness, known as the resonance phenomenon, and the instability caused by expansion and contraction of the edges. It is more preferable that the following formula (2) is satisfied, and it is even more preferable that the following formula (3) is satisfied. log(MT170℃)≧-1.1×log(MFR)+2.3 (Equation 2) log(MT170℃)≧-1.1×log(MFR)+2.5 (Equation 3)

[0073] There is no particular need to set an upper limit for MT, but when MT exceeds 40 g, the take-up speed becomes extremely slow and measurement becomes difficult in the above measurement method. In such a case, it is considered that the extensibility of the resin is also reduced, so that the upper limit is preferably 40 g or less, more preferably 35 g or less, and even more preferably 30 g or less. In order to satisfy the above condition (formula 1), for example, the amount of long chain branches in the polypropylene resin (X2) may be increased to increase the melt tension, and this can be achieved by selecting preferred metallocene catalysts described below, combining them, and controlling the quantitative ratio thereof, as well as the prepolymerization conditions, to introduce a large amount of long chain branches.

[0074] 1-2-5. Characteristics (X2-5): Branching index g' (Mz abs ) is between 0.70 and 0.95.

[0075] As a direct indicator of whether the polypropylene resin (X2) has branches, the branching index g' can be mentioned, as in the case of the polypropylene resin (X1), and the method for calculating g' is also the same. The branching index g' can be set to 0.70 or more and 0.95 or less by introducing a large amount of long chain branches. For example, this can be achieved by selecting preferred metallocene catalysts, combining them, and controlling the amount ratio thereof, as well as the prepolymerization conditions. The polypropylene resin (X2) used in the present invention has a Z-average molecular weight Mz of absolute molecular weight Mabs determined by light scattering. abs g'(Mz abs ) is preferably 0.72 or more, more preferably 0.75 or more, even more preferably 0.80 or more, and is preferably 0.90 or less, more preferably 0.88 or less, even more preferably 0.85 or less.

[0076] 1-2-6.(X2-6): 13 The mm fraction of propylene unit triads measured by C-NMR is 95% or more.

[0077] The polypropylene resin (X2) used in the present invention preferably has high stereoregularity. The degree of stereoregularity is as follows: 13 It can be evaluated by C-NMR. 13 The mm fraction of propylene unit triads obtained by C-NMR has a stereoregularity of 95% or more, and the effect is similar to that of the polypropylene resin (X1).

[0078] 1-2-7. Manufacturing method of polypropylene resin (X2) The polypropylene resin (X2) is not particularly limited in the production method as long as it satisfies the above-mentioned properties (X2-1) to (X2-6). As described above, the polypropylene resin (X2) preferably has high stereoregularity, a relatively wide molecular weight distribution, a branching index g'(Mz abs A preferred production method for satisfying the conditions such as the range of molecular weight distribution, high melt tension, etc. is a method using a macromer copolymerization method utilizing a combination of metallocene catalysts. An example of such a method is the method disclosed in JP 2009-57542 A. This method is a method for producing polypropylene having a structure with long chain branches using a catalyst that combines a catalyst component having a specific structure capable of generating a macromer with a catalyst component having a specific structure capable of copolymerizing a macromer. This method makes it possible to produce a polypropylene resin having a structure with long chain branches and having the desired physical properties by an industrially effective method such as bulk polymerization or gas phase polymerization, particularly by single-stage polymerization under practical pressure and temperature conditions, and by using hydrogen as a molecular weight modifier.

[0079] The polypropylene resin (X2) according to the present invention may be a propylene homopolymer obtained by homopolymerizing a propylene monomer, or a propylene-α-olefin copolymer obtained by copolymerizing a propylene monomer with an α-olefin comonomer having 2 to 20 carbon atoms other than propylene, such as ethylene and / or 1-butene. The shape of the polypropylene resin (X2) is not particularly limited, and it may be in the form of a powder or a particulate product thereof.

[0080] The polypropylene resin (X2) according to the present invention may be obtained by mixing other additional components described later as necessary using a Henschel mixer, a V blender, a ribbon blender, a tumbler blender or the like, and may be kneaded into granules as necessary using a kneading machine such as a single-screw extruder, a multi-screw extruder, a kneader or a Banbury mixer.

[0081] 1-3. Polypropylene resin (Y) The polypropylene resin (Y) has the properties (Y-1) to (Y-2).

[0082] 1-3-1. Property (Y-1): MFR (230°C, load 2.16 kgf) is 10g / 10min or more and 50g / 10min or less. The MFR of the polypropylene resin (Y) is 10 g / 10 min or more, preferably 15 g / 10 min or more, from the viewpoint of improving the fluidity of the polypropylene resin composition and suppressing the resonance phenomenon during extrusion lamination molding, while the MFR of the polypropylene resin (Y) is 50 g / 10 min or less, preferably 45 g / 10 min or less, from the viewpoint of improving the melt tension and improving the production efficiency of the product.

[0083] The MFR of the polypropylene resin (Y) can be easily adjusted by changing the temperature and pressure conditions of the propylene polymerization, or by adding a chain transfer agent such as hydrogen during the polymerization.

[0084] Furthermore, the polypropylene resin (Y) may be one whose MFR has been adjusted by degradation with an organic peroxide after polymerization of the polypropylene resin. The organic peroxides used in this case are benzoyl peroxide, di-t-butyl peroxide, dicumyl peroxide, t-butylcumyl peroxide, 1,1-bis-(t-butylperoxy))-3,3,5-trimethylcyclohexane, 1,1-bis(t-butylperoxy)cyclohexane, 2,2-bis(t-butylperoxy)octane, n-butyl-4,4-bis(t-butylperoxy)valerate, 2,5-dimethyl-2,5-di(t-butylperoxy)hexane, 2,5-dimethyl-2,5-di( Benzoylperoxy)hexane, 2,5-dimethyl-2,5-di(t-butylperoxy)-3-hexyne, 1,3-bis(t-butylperoxyisopropyl)benzene, α,α'-bis(t-butylperoxyisopropyl)benzene, t-butyl hydroperoxide, cumene hydroperoxide, lauroyl peroxide, di-t-butyl diperoxyphthalate, t-butylperoxymaleic acid, t-butylperoxyisopropyl carbonate, and isopropyl percarbonate. These can be used alone or in combination of two or more. Among these, 2,5-dimethyl-2,5-di(t-butylperoxy)hexane, 2,5-dimethyl-2,5-di(t-butylperoxy)-3-hexyne, 1,3-bis(t-butylperoxyisopropyl)benzene, and α,α'-bis(t-butylperoxyisopropyl)benzene are particularly preferred.

[0085] The degradation method for adjusting the MFR may be carried out by using an organic peroxide, preferably in an amount of 0.005 to 0.1 parts by mass per 100 parts by mass of a resin or resin composition, and heating and kneading the two at a temperature equal to or higher than the melting temperature of the resin, for example, 180°C to 300°C. Any method may be adopted, but it is particularly preferable to carry out the process in an extruder. In addition, in order to uniformly disperse the organic peroxide in the polypropylene resin, the two may be thoroughly mixed in advance using a mixer such as a Henschel mixer or a ribbon blender before heating and kneading the two. Furthermore, in order to improve the dispersibility of the organic peroxide, a mixture of the organic peroxide in a suitable medium may also be used. In addition, the polypropylene resin (Y) of the present invention can be used in the present invention by satisfying the requirements for the properties of the polypropylene resin (Y) of the present invention after adjusting the MFR by organic peroxide degradation.

[0086] 1-3-2. Property (Y-2): The melt tension (MT170℃) measured at 170℃ (unit: g) satisfies the requirement of the following formula A. log(MT170℃)<-1.1×log(MFR)+2.0 (Formula A)

[0087] Here, MT170°C is the melt tension measured by the same method as that used for the polypropylene resin (X1), and the measurement conditions and units are as described above. This rule is an index showing the melt tension of the polypropylene resin (Y). Generally, MT has a correlation with MFR, and is therefore described by a relational formula with MFR. By satisfying the above formula A, the polypropylene resin (Y) imparts fluidity when blended with the polypropylene resins (X1) and (X2), and can reduce molding defects such as film breakage during molding.

[0088] 1-3-3. Manufacturing method of polypropylene resin (Y) There is no limitation on the production method of the polypropylene resin (Y), and it may be one produced using a Ziegler-Natta catalyst or a metallocene catalyst. Ziegler-Natta catalysts are catalyst systems such as those outlined in Section 2.3.1 (pp. 20-57) of "Polypropylene Handbook," edited by Edward P. Moore Jr., translated and supervised by Yasuda Tetsuo and Sakuma Nobuo, published by the Industrial Research Institute (1998). Examples of such catalysts include titanium trichloride catalysts consisting of titanium trichloride and organoaluminum halide, magnesium-supported catalysts consisting of a solid catalyst component containing magnesium chloride, titanium halide, and an electron donor compound, an organoaluminum, and an organosilicon compound, and a catalyst in which an organosilicon-treated solid catalyst component formed by contacting a solid catalyst component with an organoaluminum and an organosilicon compound is combined with an organoaluminum compound component.

[0089] The metallocene catalyst is a catalyst consisting of (i) a transition metal compound of Group 4 of the periodic table containing a ligand having a cyclopentadienyl skeleton (a so-called metallocene compound), (ii) a cocatalyst capable of activating the metallocene compound to a stable ionic state by reacting with the metallocene compound, and, if necessary, (iii) an organoaluminum compound, and any known catalyst can be used. The metallocene compound is preferably a bridged metallocene compound capable of stereoregular polymerization of propylene, and more preferably a bridged metallocene compound capable of isoregular polymerization of propylene.

[0090] As the above (i) metallocene compound, for example, those disclosed in JP-A-60-35007, JP-A-61-130314, JP-A-63-295607, JP-A-1-275609, JP-A-2-41303, JP-A-2-131488, JP-A-2-76887, JP-A-3-163088, JP-A-4-300887, JP-A-4-211694, JP-A-5-43616, JP-A-5-209013, JP-A-6-239914, JP-T-H7-504934, and JP-A-8-85708 can be preferably used.

[0091] More specifically, Methylenebis(2-methylindenyl)zirconium dichloride, Ethylenebis(2-methylindenyl)zirconium dichloride, Ethylene 1,2-(4-phenylindenyl)(2-methyl-4-phenyl-4H-azulenyl)zirconium dichloride, Isopropylidene(cyclopentadienyl)(fluorenyl)zirconium dichloride, isopropylidene(4-methylcyclopentadienyl)(3-t-butylindenyl)zirconium dichloride, Dimethylsilylene(2-methyl-4-t-butyl-cyclopentadienyl)(3'-t-butyl-5'-methyl-cyclopentadienyl)zirconium dichloride, Dimethylsilylenebis(indenyl)zirconium dichloride, Dimethylsilylenebis(4,5,6,7-tetrahydroindenyl)zirconium dichloride, Dimethylsilylenebis[1-(2-methyl-4-phenylindenyl)]zirconium dichloride, Dimethylsilylenebis[1-(2-ethyl-4-phenylindenyl)]zirconium dichloride, Dimethylsilylenebis[4-(1-phenyl-3-methylindenyl)]zirconium dichloride, Dimethylsilylene(fluorenyl) t-butylamido zirconium dichloride, Methylphenylsilylenebis[1-(2-methyl-4-(1-naphthyl)-indenyl)]zirconium dichloride, Dimethylsilylenebis[1-(2-methyl-4,5-benzoindenyl)]zirconium dichloride, Dimethylsilylenebis[1-(2-methyl-4-phenyl-4H-azulenyl)]zirconium dichloride, Dimethylsilylenebis[1-(2-ethyl-4-(4-chlorophenyl)-4H-azulenyl)]zirconium dichloride, Dimethylsilylenebis[1-(2-ethyl-4-naphthyl-4H-azulenyl)]zirconium dichloride, Diphenylsilylenebis[1-(2-methyl-4-(4-chlorophenyl)-4H-azulenyl)]zirconium dichloride, Dimethylsilylenebis[1-(2-ethyl-4-(3-fluorobiphenylyl)-4H-azulenyl)]zirconium dichloride, Dimethylgermylenebis[1-(2-ethyl-4-(4-chlorophenyl)-4H-azulenyl)]zirconium dichloride, Dimethylgermylenebis[1-(2-ethyl-4-phenylindenyl)]zirconium dichloride Examples of zirconium compounds include those mentioned above.

[0092] In the above, compounds in which zirconium is replaced by titanium or hafnium can also be used in the same manner. It is also preferable to use a mixture of a zirconium compound and a hafnium compound. Chloride can also be replaced by other halogen compounds, hydrocarbon groups such as methyl, isobutyl, and benzyl, amide groups such as dimethylamide and diethylamide, alkoxide groups such as methoxy and phenoxy, and hydride groups. Among these, metallocene compounds in which an indenyl group or an azulenyl group is crosslinked with a silicon or germyl group are particularly preferred. The metallocene compound may be supported on an inorganic or organic carrier before use. The carrier is preferably an inorganic or organic porous compound, and specific examples thereof include inorganic compounds such as ion-exchangeable layered silicates, zeolites, SiO2, Al2O3, silica alumina, MgO, ZrO2, TiO2, B2O3, CaO, ZnO, BaO, ThO2, etc., organic compounds such as porous polyolefins, styrene-divinylbenzene copolymers, olefin-acrylic acid copolymers, etc., or mixtures of these.

[0093] Preferred examples of the co-catalyst (ii) capable of reacting with the metallocene compound to activate it to a stable ionic state include organoaluminum oxy-compounds (e.g., aluminoxane compounds), ion-exchangeable layered silicates, Lewis acids, boron-containing compounds, ionic compounds, and fluorine-containing organic compounds.

[0094] Furthermore, preferred examples of the organoaluminum compound (iii) include trialkylaluminums such as triethylaluminum, triisopropylaluminum and triisobutylaluminum, dialkylaluminum halides, alkylaluminum sesquihalides, alkylaluminum dihalides, alkylaluminum hydrides, organoaluminum alkoxides, and the like.

[0095] Of the above, the polypropylene homopolymer is preferably one produced using a Ziegler-Natta catalyst, and the propylene random copolymer is preferably one produced using a metallocene catalyst.

[0096] The method for producing the polypropylene-based resin (Y) is not particularly limited, and it can be produced by any of the conventionally known methods such as slurry polymerization, bulk polymerization, and gas phase polymerization. Furthermore, within the scope of the invention, it is also possible to produce polypropylene and propylene-based random copolymers by utilizing a multi-stage polymerization method.

[0097] The polypropylene-based resin (Y) may be a propylene homopolymer obtained by homopolymerizing a propylene monomer, or a propylene-ethylene copolymer obtained by copolymerizing a propylene monomer and an ethylene comonomer. The polypropylene-based resin (Y) preferably contains 0% to 6.0% by mass of ethylene as a comonomer, more preferably 0% to 5.0% by mass of ethylene, and even more preferably 0% to 4.0% by mass of ethylene. If the ethylene content exceeds 6.0% by mass, the crystallinity may decrease, and the heat resistance may decrease. The shape of the polypropylene resin (Y) is not particularly limited, and it may be in the form of a powder or a particulate product thereof.

[0098] The polypropylene-based resin (Y) according to the present invention can be obtained by mixing other additional components described below as necessary using a Henschel mixer, a V blender, a ribbon blender, a tumbler blender or the like, and, as necessary, by kneading using a kneader such as a single-screw extruder, a multi-screw extruder, a kneader or a Banbury mixer.

[0099] 1-4. Polypropylene resin composition 1-4-1. Proportion of polypropylene resin (X1), polypropylene resin (X2), and polypropylene-based resin (Y) The proportions of the polypropylene resin (X1), the polypropylene resin (X2) and the polypropylene resin (Y) in the polypropylene resin composition of the present invention, based on 100% by mass of the total of (X1), (X2) and (Y), are preferably 2% by mass to 30% by mass of polypropylene resin (X1), 5% by mass to 98% by mass of polypropylene resin (X2), and 0% by mass to 80% by mass of polypropylene resin (Y), and more preferably 2% by mass to 30% by mass of polypropylene resin (X1), 5% by mass to 80% by mass of polypropylene resin (X2), and 10% by mass to 80% by mass of polypropylene resin (Y). and more preferably 5% by mass to 30% by mass of polypropylene resin (X1), 5% by mass to 50% by mass of polypropylene resin (X2), and 20% by mass to 80% by mass of polypropylene-based resin (Y), even more preferably 5% by mass to 25% by mass of polypropylene resin (X1), 15% by mass to 45% by mass of polypropylene resin (X2), and 30% by mass to 70% by mass of polypropylene-based resin (Y), and particularly preferably 5% by mass to 20% by mass of polypropylene resin (X1), 20% by mass to 40% by mass of polypropylene resin (X2), and 40% by mass to 65% by mass of polypropylene-based resin (Y). The amount of polypropylene resin (X1) may be 2% by mass or more, 2.5% by mass or more, 5% by mass or more, and may be 30% by mass or less, 25% by mass or less, or 20% by mass or less, based on 100% by mass of the total of (X1), (X2), and (Y). The polypropylene resin (X2) may be 5% by mass or more, 15% by mass or more, or 20% by mass or more, and may be 98% by mass or less, 80% by mass or less, 50% by mass or less, 45% by mass or less, or 40% by mass or less, based on 100% by mass of the total of (X1), (X2), and (Y). The polypropylene resin (Y) may be 0 mass% or more, 10 mass% or more, 20 mass% or more, 30 mass% or more, 40 mass% or more, 80 mass% or less, 70 mass% or less, or 65 mass% or less, based on 100 mass% of the total of (X1), (X2) and (Y). By setting the content within the above range, a resin composition can be obtained which has small neck-in during high-temperature extrusion molding at, for example, 290°C or higher, high extensibility, excellent high-speed extrusion lamination processability, and which can give molded articles with excellent transparency.

[0100] As a first preferred embodiment of the polypropylene resin composition of the present invention, 2% by mass to 30% by mass of a polypropylene resin (X1) having the following properties (X1-1) to (X1-6), 5% by mass to 98% by mass of a polypropylene resin (X2) having the following properties (X2-1) to (X2-6), and 0% to 80% by mass of a polypropylene resin (Y) having the following properties (Y-1) to (Y-2) (wherein the total amount of the polypropylene resin (X1), the polypropylene resin (X2) and the polypropylene resin (Y) is 100% by mass). The preferred ranges of each ratio and each property may be the same as those described above. (X1-1) The MFR (230°C, load 2.16 kgf) is greater than 0.5 g / 10 min and is 10 g / 10 min or less. (X1-2) The ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) obtained by GPC is 2.0 or more and 5.0 or less, and the ratio (Mz / Mw) of the Z average molecular weight (Mz) to the weight average molecular weight (Mw) is 2.0 or more and 5.0 or less. (X1-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 3.5 mass% or more. (X1-4) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation 1). log(MT170℃)≧-1.1×log(MFR)+2.0 (Equation 1) (X1-5) Branching index g'(Mz abs ) is greater than or equal to 0.70 and less than or equal to 0.95. (X1-6) 13 The triad fraction (mm) of three consecutive propylene units measured by C-NMR is 95% or more. (X2-1) The MFR (230°C, load 2.16 kgf) is greater than 10 g / 10 min and is 80 g / 10 min or less. (X2-2) The ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) obtained by GPC is 2.0 or more and 5.0 or less, and the ratio (Mz / Mw) of the Z average molecular weight (Mz) to the weight average molecular weight (Mw) is 2.0 or more and 5.0 or less. (X2-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 0.5 mass % or more and less than 3.5 mass %. (X2-4) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation 1). log(MT170℃)≧-1.1×log(MFR)+2.0 (Equation 1) (X2-5) Branching index g'(Mz abs ) is greater than or equal to 0.70 and less than or equal to 0.95. (X2-6) 13 The triad fraction (mm) of three consecutive propylene units measured by C-NMR is 95% or more. (Y-1) MFR (230°C, load 2.16 kgf) is 10 g / 10 min or more and 50 g / 10 min or less. (Y-2) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation A). log(MT170℃)<-1.1×log(MFR)+2.0 (Formula A)

[0101] In addition, a second preferred embodiment of the polypropylene resin composition of the present invention is 5% by mass to 30% by mass of a polypropylene resin (X1) having the following properties (X1-1) to (X1-6), 5% by mass to 50% by mass of a polypropylene resin (X2) having the following properties (X2-1) to (X2-6), and 20% to 80% by mass of a polypropylene resin (Y) having the following properties (Y-1) to (Y-2) (wherein the total amount of the polypropylene resin (X1), the polypropylene resin (X2) and the polypropylene resin (Y) is 100% by mass). The preferred ranges of each ratio and each property may be the same as those described above. (X1-1) The MFR (230°C, load 2.16 kgf) is greater than 0.5 g / 10 min and is 30 g / 10 min or less. (X1-2) The ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) obtained by GPC is 2.0 or more and 5.0 or less, and the ratio (Mz / Mw) of the Z average molecular weight (Mz) to the weight average molecular weight (Mw) is 2.0 or more and 5.0 or less. (X1-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 2.5 mass% or more. (X1-4) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation 1). log(MT170℃)≧-1.1×log(MFR)+2.0 (Equation 1) (X1-5) Branching index g'(Mz abs ) is greater than or equal to 0.70 and less than or equal to 0.95. (X1-6)13 The triad fraction (mm) of three consecutive propylene units measured by C-NMR is 95% or more. (X2-1) The MFR (230°C, load 2.16 kgf) is greater than 30 g / 10 min and less than 80 g / 10 min. (X2-2) The ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) obtained by GPC is 2.0 or more and 5.0 or less, and the ratio (Mz / Mw) of the Z average molecular weight (Mz) to the weight average molecular weight (Mw) is 2.0 or more and 5.0 or less. (X2-3) The proportion of components with a molecular weight of 1 million or more in the integral molecular weight distribution curve obtained by GPC (W 1M ) is 0.5 mass % or more and less than 2.5 mass %. (X2-4) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation 1). log(MT170℃)≧-1.1×log(MFR)+2.0 (Equation 1) (X2-5) Branching index g'(Mz abs ) is greater than or equal to 0.70 and less than or equal to 0.95. (X2-6) 13 The triad fraction (mm) of three consecutive propylene units measured by C-NMR is 95% or more. (Y-1) MFR (230°C, load 2.16 kgf) is 10 g / 10 min or more and 50 g / 10 min or less. (Y-2) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation A). log(MT170℃)<-1.1×log(MFR)+2.0 (Formula A)

[0102] 1-4-2.Other ingredients The polypropylene resin composition of the present invention can be used by adding various components described below, other than the polypropylene resin (X1), polypropylene resin (X2) and polypropylene resin (Y), as necessary.

[0103] 1-4-2-1.Additives Additives such as antioxidants that can be added to polypropylene resins can be appropriately added to the polypropylene resin composition of the present invention, so long as they do not significantly impair the effects of the present invention. Specifically, phenol-based stabilizers such as 2,6-di-t-butyl-p-cresol (BHT), tetrakis[methylene-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate]methane (manufactured by BASF Japan Ltd., product name "IRGANOX 1010"), and n-octadecyl-3-(4'-hydroxy-3,5'-di-t-butylphenyl)propionate (manufactured by BASF Japan Ltd., product name "IRGANOX 1076"), phosphite-based stabilizers such as bis(2,4-di-t-butylphenyl)pentaerythritol diphosphite and tris(2,4-di-t-butylphenyl)phosphite, lubricants such as higher fatty acid amides and higher fatty acid esters, antistatic agents such as glycerin esters, sorbitan acid esters, and polyethylene glycol esters of fatty acids having 8 to 22 carbon atoms, and antiblocking agents such as silica, calcium carbonate, and talc may be added.

[0104] Furthermore, in order to impart weather resistance to the polypropylene resin composition of the present invention, an ultraviolet absorber and a light stabilizer may be added. UV absorbents are compounds that have an absorption band in the UV region, and known types include triazoles, benzophenones, salicylates, cyanoacrylates, nickel chelates, inorganic fine particles, etc. Among these, the most widely used are triazoles. Representative compounds as ultraviolet absorbents are given below as examples. Examples of triazole compounds include 2-(2'-hydroxy-5'-methylphenyl)benzotriazole (trade names: Sumisorb 200, Tinuvin P), 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole (trade names: Sumisorb 340, Tinuvin 399), 2-(2'-hydroxy-3',5'-di-t-butylphenyl)benzotriazole (trade names: Sumisorb 320, Tinuvin 320), 2-(2'-hydroxy-3',5'-di-t-amylphenyl)benzotriazole (trade names: Sumisorb 350, Tinuvin 328), and 2-(2'-hydroxy-3'-t-butyl-5'-methylphenyl)-5-chlorobenzotriazole (trade names: Sumisorb 300, Tinuvin 326). Examples of benzophenone compounds include 2-hydroxy-4-methoxybenzophenone (trade name: Sumisorb 110) and 2-hydroxy-4-n-octoxybenzophenone (trade name: Sumisorb 130). An example of a salicylate compound is 4-t-butylphenyl salicylate (product name: Seesorb 202). An example of a cyanoacrylate compound is ethyl (3,3-diphenyl) cyanoacrylate (product name: Seesorb 501). An example of a nickel chelate compound is nickel dibutyldithiocarbamate (trade name: Antigen NBC). Examples of inorganic fine particle compounds include TiO2, ZnO2, and CeO2.

[0105] Hindered amine compounds are commonly used as light stabilizers, and are known as HALS. HALS has a 2,2,6,6-tetramethylpiperidine structure, and although it cannot absorb ultraviolet light, it inhibits photodegradation through a wide variety of functions. Its three main functions are said to be the scavenging of radicals, the decomposition of hydroxyperoxide compounds, and the capture of heavy metals that accelerate the decomposition of hydroxyperoxide.

[0106] Representative examples of HALS are given below. Examples of sebacate type compounds include bis(2,2,6,6-tetramethyl-4-piperidyl)sebacate (trade name: Adekastab LA-77, Sanol LS-770) and bis(1,2,2,6,6-pentamethyl-4-piperidyl)sebacate (trade name: Sanol LS-765). Examples of butane tetracarboxylate type compounds include tetrakis(2,2,6,6-tetramethyl-4-piperidyl)-1,2,3,4-butane tetracarboxylate (trade name: Adeka STAB LA-57), tetrakis(1,2,2,6,6-pentamethyl-4-piperidyl)-1,2,3,4-butane tetracarboxylate (trade name: Adeka STAB LA-52), a condensate of 1,2,3,4-butane tetracarboxylic acid with 2,2,6,6-tetramethyl-4-piperidinol and tridecyl alcohol (trade name: Adeka STAB LA-67), and a condensate of 1,2,3,4-butane tetracarboxylic acid with 1,2,2,6,6-pentamethyl-4-piperidinol and tridecyl alcohol (trade name: Adeka STAB LA-62). Examples of succinic acid polyester-type compounds include condensation polymers of succinic acid and 1-(2-hydroxyethyl)-4-hydroxy-2,2,6,6-tetramethylpiperidine. Examples of triazine-type compounds include N,N'-bis(3-aminopropyl)ethylenediamine·2,4-bis{N-butyl-N-(1,2,2,6,6-pentamethyl-4-piperidyl)amino}-6-chloro-1,3,5-triazine condensate (trade name: Chimasorb199), poly{6-(1,1,3,3-tetramethylbutyl)amino-1,3,5-triazine-2,4-diyl}{(2,2,6,6-tetramethyl- 4-piperidyl)imino}hexamethylene{(2,2,6,6-tetramethyl-4-piperidyl)imino} (trade name: Chimasorb 944), and poly(6-morpholino-s-triazine-2,4-diyl){(2,2,6,6-tetramethyl-4-piperidyl)imino}hexamethylene{(2,2,6,6-tetramethyl-4-piperidyl)imino} (trade name: Chimasorb 3346) can be mentioned as examples.

[0107] 1-4-2-2.Other polymers To the polypropylene resin composition of the present invention, modifiers such as elastomers and polyethylene resins which can be added to polypropylene resins can be appropriately added. Among the above, examples of the elastomer include ethylene-α-olefin copolymers, binary random copolymer resins of propylene and an α-olefin having 4 to 12 carbon atoms, and ternary random copolymer resins of propylene, ethylene, and an α-olefin having 4 to 12 carbon atoms.

[0108] Furthermore, a styrene-based elastomer can also be added. The styrene-based elastomer can be appropriately selected from commercially available products and used. For example, hydrogenated styrene-butadiene block copolymers are sold under the product name "Kraton G" by Kraton Polymer Japan Co., Ltd. and under the product name "Tuftec" by Asahi Chemicals Co., Ltd., hydrogenated styrene-isoprene block copolymers are sold under the product name "Septon" by Kuraray Co., Ltd., hydrogenated styrene-vinylated polyisoprene block copolymers are sold under the product name "Hybler" by Kuraray Co., Ltd., and hydrogenated styrene-butadiene random copolymers are sold under the product name "Dynaron" by JSR Corporation. Any of these product groups may be appropriately selected for use.

[0109] Examples of polyethylene resins include ethylene / α-olefin copolymers such as low-density polyethylene and linear low-density polyethylene, and their density is 0.860 g / cm. 3 ~0.910g / cm 3 and preferably in the range of 0.870 g / cm 3 ~0.905g / cm 3 More preferably, it is 0.875 g / cm 3 ~0.895g / cm 3 If the content exceeds the above range, the transparency may decrease. The density is a value measured at 23° C. in accordance with JIS K7112. The α-olefin used in the ethylene / α-olefin copolymer is preferably an α-olefin having 3 to 18 carbon atoms. Specific examples include propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-heptene, 4-methyl-pentene-1, 4-methyl-hexene-1, 4,4-dimethylpentene-1, etc. The α-olefin may be one type or a combination of two or more types. Examples of such ethylene / α-olefin copolymers include ethylene-based elastomers, ethylene-propylene-based rubbers, etc. In particular, ethylene / α-olefin copolymers called metallocene-based polyethylenes, which are produced using metallocene-based catalysts with little loss of transparency, are preferred.

[0110] The amount of polyethylene resin or the like to be added is preferably 5 to 35 parts by mass, more preferably 6 to 30 parts by mass, and even more preferably 7 to 25 parts by mass, relative to 100 parts by mass in total of (X1), (X2), and (Y).

[0111] The polypropylene resin composition of the present invention contains 100 parts by mass of the above (X1), (X2), and (Y) in total, or, if necessary, other components that do not impair the effects of the present invention. Examples of methods for mixing these components include mixing with a Henschel mixer, V blender, ribbon blender, tumbler blender, etc., and, if necessary, melt-kneading with a kneader such as a single-screw extruder, multi-screw extruder, kneader, or Banbury mixer. In either case, there is no particular limitation on the mixing method as long as the effects of the present invention are not impaired.

[0112] 1-4-3. Uses of polypropylene resin compositions The polypropylene resin composition of the present invention can be used for producing various molded articles by appropriately molding into a desired shape by means of pressure molding, film molding, vacuum molding, extrusion molding, extrusion lamination molding, foam molding, blow molding, injection molding, or the like.

[0113] The polypropylene resin composition of the present invention is particularly suitable for use in extrusion lamination. The polypropylene resin composition of the present invention is suitably used for producing a laminate by melt extrusion lamination (extrusion lamination) on the surface of a substrate. Extrusion lamination is a molding process in which a molten resin film extruded from a T-die is continuously coated and pressed onto the surface of a previously manufactured substrate, and this process simultaneously coats and bonds the substrate. Usually, the substrate is laminated on one side, but it can also be laminated on both sides if necessary.

[0114] 2. Method for producing polypropylene resin composition The method for producing the polypropylene resin composition of the present invention comprises the steps of: obtaining a polypropylene resin (X1) having the above-mentioned properties (X1-1) to (X1-6); A step of obtaining a polypropylene resin (X2) having the above properties (X2-1) to (X2-6), and The method is characterized by comprising a step of mixing or melt-kneading the polypropylene resin (X1) and the polypropylene resin (X2). In a preferred embodiment, the method for producing the polypropylene resin composition of the present invention further comprises a step of obtaining a polypropylene resin (Y) having the above-mentioned properties (Y-1) to (Y-2), The mixing or melt-kneading step may be a step of mixing or melt-kneading the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene-based resin (Y). As a more preferred embodiment, the mixing or melt-kneading step may be a step of mixing or melt-kneading 2% by mass to 30% by mass of the polypropylene resin (X1), 5% by mass to 98% by mass of the polypropylene resin (X2), and 0% by mass to 80% by mass of the polypropylene-based resin (Y) (wherein the total amount of the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene-based resin (Y) is 100% by mass). In this case, the polypropylene resin (X1) and the polypropylene resin (X2) may be the same as the polypropylene resin (X1) and the polypropylene resin (X2) in the above "First preferred embodiment of the polypropylene-based resin composition". As a more preferred embodiment, the mixing or melt-kneading step may be a step of mixing or melt-kneading 5% by mass to 30% by mass of the polypropylene resin (X1), 5% by mass to 50% by mass of the polypropylene resin (X2), and 20% by mass to 80% by mass of the polypropylene-based resin (Y) (wherein the total amount of the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene-based resin (Y) is 100% by mass). In this case, the polypropylene resin (X1) and the polypropylene resin (X2) may be the same as the polypropylene resin (X1) and the polypropylene resin (X2) in the above "Preferred second embodiment of the polypropylene-based resin composition".

[0115] The method for obtaining the polypropylene resin (X1) is not particularly limited, and the polypropylene resin (X1) can be produced by the method described in the above "Production method of polypropylene resin (X1)". The method for obtaining the polypropylene resin (X2) is not particularly limited, and the polypropylene resin (X2) can be produced by the method described in the above "Production method of polypropylene resin (X2)". The method for obtaining the polypropylene resin (Y) is not particularly limited, and the polypropylene resin (Y) can be produced by the method described in the above "Production method of polypropylene resin (Y)". The method for mixing the polypropylene resin (X1), the polypropylene resin (X2), and, if necessary, the polypropylene-based resin (Y) is not particularly limited, and examples of the method include mixing using a Henschel mixer, a V blender, a ribbon blender, a tumbler blender, or the like. The method for melt-kneading the polypropylene resin (X1), the polypropylene resin (X2), and, if necessary, the polypropylene-based resin (Y) is not particularly limited, and examples of the method include a method for melt-kneading using a kneader such as a single-screw extruder, a multi-screw extruder, a kneader, or a Banbury mixer. The ratio of the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene-based resin (Y) can be, for example, the ratios described above in "Ratio of polypropylene resin (X1), polypropylene resin (X2), and polypropylene-based resin (Y)". The use of the polypropylene resin composition thus produced may be the same as the above-mentioned "Use of the polypropylene resin composition".

[0116] 3.Laminate The laminate of the present invention is a laminate comprising a base layer and a polypropylene-based resin composition layer, wherein the polypropylene-based resin composition layer comprises a polypropylene resin (X1) having the above-mentioned properties (X1-1) to (X1-6) and a polypropylene resin (X2) having the above-mentioned properties (X2-1) to (X2-6). In the laminate of the present invention, as a preferred embodiment, the polypropylene resin composition layer may further contain a polypropylene resin (Y) having the above properties (Y-1) to (Y-2). As a more preferred embodiment, the polypropylene resin composition layer may contain 2% by mass to 30% by mass of the polypropylene resin (X1), 5% by mass to 98% by mass of the polypropylene resin (X2), and 0% by mass to 80% by mass of the polypropylene resin (Y). (The total amount of the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene resin (Y) is 100% by mass.) In this case, the polypropylene resin (X1) and the polypropylene resin (X2) may be the same as the polypropylene resin (X1) and the polypropylene resin (X2) in the "First preferred embodiment of the polypropylene resin composition". As a more preferred embodiment, the polypropylene resin composition layer may contain 5% by mass to 30% by mass of the polypropylene resin (X1), 5% by mass to 50% by mass of the polypropylene resin (X2), and 20% by mass to 80% by mass of the polypropylene resin (Y). (The total amount of the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene resin (Y) is 100% by mass.) In this case, the polypropylene resin (X1) and the polypropylene resin (X2) may be the same as the polypropylene resin (X1) and the polypropylene resin (X2) in the above "Preferred second embodiment of the polypropylene resin composition".

[0117] The ratio of the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene-based resin (Y) can be, for example, the ratios described above in "Ratio of polypropylene resin (X1), polypropylene resin (X2), and polypropylene-based resin (Y)".

[0118] Examples of the substrate used for the substrate layer include films or sheets of thermoplastic resins such as polyester resins such as polyethylene terephthalate and polybutylene terephthalate, saponified ethylene-vinyl acetate copolymer, polyvinyl chloride, polyvinylidene chloride, polyethylene, polypropylene, poly-4-methyl-1-pentene, polycarbonate resins, polyamide 6, polyamide 66, polyamide 6-66, polyamide 12, and other polyamide resins, as well as paper and metal foils such as aluminum and iron. The thermoplastic resin film or sheet may be uniaxially or biaxially stretched, and a biaxially stretched polypropylene film is particularly preferred. A laminate of this with paper is also preferred. The thickness of the substrate layer is usually about 5 μm to 100 μm. Examples of the method for laminating the substrate layer and the polypropylene-based resin composition layer include extrusion lamination, co-extrusion film method, dry lamination, wet lamination, hot melt lamination, and thermal lamination.

[0119] The form of the substrate is not limited to a film or a sheet, and may be a woven fabric or a nonwoven fabric. The substrate may be a single-layer structure or a multi-layer structure. The method for producing a multi-layer substrate is not particularly limited, and examples thereof include a co-extrusion film method, a dry lamination method, a wet lamination method, a hot melt lamination method, an extrusion lamination method, and a thermal lamination method. Furthermore, these substrates may have been previously subjected to various film processing treatments such as anchor coating, metal deposition, corona discharge treatment, printing, and the like.

[0120] The laminate of the present invention can be suitably used for packaging applications such as various foods and beverages, medicines and medical products, cosmetics, clothing, stationery, building materials, battery packaging, paper product packaging, and other industrial materials and materials.

[0121] 4. Manufacturing method of laminate The method for producing a laminate of the present invention is a method for producing a laminate including a base layer and a polypropylene-based resin composition layer, The method is characterized by comprising a step of extrusion laminating a mixture or melt-kneaded product of a polypropylene resin (X1) having the above properties (X1-1) to (X1-6) and a polypropylene resin (X2) having the above properties (X2-1) to (X2-6) onto at least one surface of a base layer to form the polypropylene resin composition layer. As a preferred embodiment, the step of forming the polypropylene-based resin composition layer may be a step of extrusion laminating a mixture or melt-kneaded product of the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene resin (Y) further having the above properties (Y-1) to (Y-2) on at least one surface of the base layer to form the polypropylene-based resin composition layer. In a more preferred embodiment, the step of forming the polypropylene-based resin composition layer may be a step of forming the polypropylene-based resin composition layer by extrusion laminating a mixture or melt-kneaded product of 2% by mass to 30% by mass of the polypropylene resin (X1), 5% by mass to 98% by mass of the polypropylene resin (X2), and 0% by mass to 80% by mass of the polypropylene-based resin (Y) (wherein the total amount of the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene-based resin (Y) is 100% by mass). In this case, the polypropylene resin (X1) and the polypropylene resin (X2) may be the same as the polypropylene resin (X1) and the polypropylene resin (X2) in the above "First preferred embodiment of the polypropylene-based resin composition". In a further preferred embodiment, the step of forming the polypropylene-based resin composition layer may be a step of forming the polypropylene-based resin composition layer by extrusion laminating a mixture or melt-kneaded product of 5% by mass to 30% by mass of the polypropylene resin (X1), 5% by mass to 50% by mass of the polypropylene resin (X2), and 20% by mass to 80% by mass of the polypropylene-based resin (Y) (wherein the total amount of the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene-based resin (Y) is 100% by mass). In this case, the polypropylene resin (X1) and the polypropylene resin (X2) may be the same as the polypropylene resin (X1) and the polypropylene resin (X2) in the above "Preferred second embodiment of the polypropylene-based resin composition".

[0122] Examples of the substrate layer include the substrate layers described above in "3. Laminate." The method for mixing and melt-kneading the polypropylene resin (X1), the polypropylene resin (X2) and the polypropylene-based resin (Y) can be exemplified by the methods described in the above "2. Method for producing a polypropylene-based resin composition". The ratio of the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene-based resin (Y) can be, for example, the ratios described above in "Ratio of polypropylene resin (X1), polypropylene resin (X2), and polypropylene-based resin (Y)".

[0123] When the polypropylene resin composition of the present invention containing the polypropylene resin (X1), the polypropylene resin (X2) and the polypropylene resin (Y) is extrusion laminated onto the base layer, the melt extrusion temperature of the resin composition is usually 180° C. to 320° C., preferably 200° C. to 310° C. If the temperature exceeds 320° C., moldability may decrease. The extrusion lamination molding speed is directly related to productivity, and therefore, molding is preferably performed at 200 m / min or more, more preferably 210 m / min or more. The surface of the molten film of the polypropylene resin composition of the present invention may be subjected to ozone treatment for the purpose of introducing polar groups. The amount of ozone treatment is 0.01 g / m2 relative to the surface area of ​​the molten film. 2 ~1g / m 2 It is preferable that the reaction is carried out in a temperature range of 100° C. to 300° C.

[0124] Extrusion lamination is usually carried out on one surface of the base layer, but it can be carried out on both surfaces, if necessary. The thickness of the formed polypropylene resin composition layer is usually 1 μm to 250 μm, preferably 3 μm to 200 μm, and particularly preferably 5 μm to 150 μm. The laminate obtained by extrusion lamination can further be subjected to various film processing treatments such as metal deposition processing, corona discharge processing, printing processing, and the like. EXAMPLES

[0125] The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples. The evaluation methods and resins used in the examples and comparative examples are as follows.

[0126] 1. Evaluation method (1)Melt flow rate (MFR): Measured in accordance with ISO 1133:1997 Conditions M. The unit is g / 10 min. (2) Molecular weight distribution (Mw / Mn and Mz / Mn): It was determined by GPC measurement according to the method described above. (3) Melt tension (MT): According to the above-mentioned method, the measurement was carried out using a Capillograph 1B manufactured by Toyo Seiki Seisakusho under the following conditions. Capillary: diameter 2.0mm, length 40mm Cylinder diameter: 9.55mm Cylinder extrusion speed: 20mm / min Take-up speed: 4.0m / min ·Temperature: 170℃ 230℃ If the MT is extremely high, the resin may break at a take-up speed of 4.0 m / min. In such a case, the take-up speed is reduced, and the tension at the highest possible take-up speed is taken as the MT. The unit is grams (g). (4) Branching index (g'(Mz abs )): According to the above-mentioned method, the viscosity was measured by GPC equipped with a differential refractometer (RI), a viscosity detector (Viscometer), and a light scattering detector (MALLS) as detectors. (5) mm fraction: The value was calculated according to the method described above, and the unit is %. (6) Ethylene content: Using a JEOL Ltd. GSX-400 or equivalent device (carbon nuclear resonance frequency 100 MHz or higher), according to the method described in paragraphs

[0120] to

[0125] of JP2013-199642A, 13This value is determined by analyzing the C-NMR spectrum. The unit is mass %. (7)Melting point: Using a differential scanning calorimeter (DSC), the temperature was first raised to 200°C, left for 5 minutes, then lowered to 40°C at a rate of 10°C / min, and measured again at a rate of 10°C / min. The temperature at the top of the endothermic peak was taken as the melting point (unit: °C).

[0127] 2. Extrusion lamination formability (1) Spreadability: A polypropylene resin composition was extruded using an extrusion lamination device set so that the temperature of the resin extruded from a T-die attached to an extruder with a diameter of 90 mm was 290°C. The extrusion amount was adjusted so that the coating thickness was 20 μm when the air gap was 100 mm, the cooling roll surface temperature was 25°C, the die width was 560 mm, the die lip opening was 0.7 mm, and the take-up speed was 80 m / min. The resulting film had a width of 505 mm and a basis weight of 50 g / m. 2 The extrusion lamination process was performed on the kraft paper of 100 mm in diameter while increasing the take-up speed from 80 m / min, and the maximum processing speed (unit: m / min) at which draw resonance did not occur was defined as the ductility. A material with a ductility of 200 m / min or more has excellent extrusion lamination moldability. (2) Neck-in: Using the above-mentioned extrusion lamination device, the processing speed was 80 m / min and the basis weight was 50 g / m 2 A laminate having an extrusion laminate coating thickness of 20 μm was prepared on the kraft paper of 100 mm, and the difference (unit: mm) between the die width and the width of the resin composition layer in the obtained laminate was taken as the neck-in. The smaller the neck-in, the wider the effective product width and the better the extrusion lamination processability.

[0128] 3.Film properties (1) Preparation of films for evaluating physical properties: Using the above-mentioned extrusion lamination device, a laminate having an extrusion laminate coating thickness of 40 μm was produced on a biaxially oriented PET film having a thickness of 12 μm at a processing speed of 40 m / min. The biaxially stretched PET film was peeled off from the resulting laminate to obtain a film for evaluating physical properties. (2) HAZE: The haze of the film for evaluating physical properties obtained in (1) above was measured in accordance with JIS K 7105. The smaller the haze value (unit: %), the better the transparency.

[0129] 4.Materials used (1) Polypropylene resin (X1) The polymer (X1-1) produced in the following Production Example 1 was used.

[0130] [Production Example 1 (Production of PP-1)] <Catalyst synthesis example 1> (1) Synthesis of the complex (1-a) Synthesis of rac-dichloro[1,1'-dimethylsilylenebis{2-(5-methyl-2-furyl)-4-(4-i-propylphenyl)indenyl}]hafnium: rac-Dichloro[1,1′-dimethylsilylenebis{2-(5-methyl-2-furyl)-4-(4-i-propylphenyl)indenyl}]hafnium was synthesized according to the method of Synthesis Example 1 in JP2012-149160A.

[0131] (1-b) Synthesis of rac-dichloro[1,1'-dimethylsilylenebis{2-methyl-4-(4-chlorophenyl)-4-hydroazulenyl}]hafnium: rac-Dichloro[1,1'-dimethylsilylenebis{2-methyl-4-(4-chlorophenyl)-4-hydroazulenyl}]hafnium was synthesized according to the method of Example 7 of JP-A-11-240909.

[0132] (2) Preparation of catalyst (2-a) Chemical treatment of ion-exchangeable layered silicate Into a 1 L three-neck flask equipped with a stirring blade and a reflux device, 645.1 g of distilled water and 82.6 g of 98% sulfuric acid were added and heated to 95°C. 100 g of commercially available montmorillonite (Benclay KK manufactured by Mizusawa Chemical Industry Co., Ltd., Al=9.78% by mass, Si=31.79% by mass, Mg=3.18% by mass, Al / Si (molar ratio)=0.320, average particle size 14 μm) was added thereto, and the mixture was reacted for 320 minutes at 95° C. After 320 minutes, 0.5 L of distilled water was added to stop the reaction, and 255 g of a cake-like solid was obtained by filtration. This cake (1 g) contained 0.31 g of the chemically treated montmorillonite (intermediate). The chemical composition of the chemically treated montmorillonite (intermediate) was Al = 7.68 mass%, Si = 36.05 mass%, Mg = 2.13 mass%, and the Al / Si (molar ratio) = 0.222. 1545g of distilled water was added to the cake to make a slurry, and the temperature was raised to 40℃. 5.734g of lithium hydroxide hydrate was added as a solid, and the reaction was carried out at 40℃ for 1 hour. After 1 hour, the reaction slurry was filtered and washed with 1L of distilled water three times, and a cake-like solid was obtained again. The collected cake was dried to obtain 80 g of chemically treated montmorillonite, which had a chemical composition of Al=7.68% by mass, Si=36.05% by mass, Mg=2.13% by mass, Al / Si (molar ratio)=0.222, and Li=0.53% by mass.

[0133] (2-b) Prepolymerization Internal volume 1m 3 150 kg of the chemically treated montmorillonite obtained above was placed in a reactor, 2832 L of hexane was added to make a slurry, 74.4 kg (375 mol) of triisobutylaluminum was added over 85 minutes, and the mixture was stirred for 60 minutes. After that, the mixture was washed with hexane until it reached 1 / 32 of its capacity, and the total volume was adjusted to 900 L. The slurry solution containing this chemically treated montmorillonite was kept at 50° C., and 0.65 kg of triisobutylaluminum (4.257 kg, 3.28 mol of a hexane solution with a concentration of 15.3% by mass) was added thereto. After stirring for 5 minutes, 0.657 kg (0.81 mol) of rac-dichloro[1,1'-dimethylsilylenebis{2-methyl-4-(4-chlorophenyl)-4-hydroazulenyl}]hafnium and 96 L of toluene were added, and stirring was continued for 60 minutes. Thereafter, 9.758 kg (26.61 mol) of tri-normal octylaluminum was added and stirred for 6 minutes, and then, in another vessel equipped with a stirrer, a solution prepared by adding 0.064 kg of triisobutylaluminum (9.88 kg, 0.32 mol of a toluene solution with a concentration of 0.648% by mass) to 240 L of toluene and adding 1.768 kg (1.89 mol) of rac-dichloro[1,1'-dimethylsilylenebis{2-(5-methyl-2-furyl)-4-(4-i-propylphenyl)indenyl}]hafnium was added, 100 L of toluene was added, and stirring was continued for another 20 minutes. Thereafter, 2387 L of hexane was added, the internal temperature of the reactor was raised to 40°C, and then 328.1 kg of propylene was fed over 240 minutes to carry out prepolymerization while maintaining the temperature at 40°C. Thereafter, the propylene feed was stopped, and the residual polymerization was carried out at 40° C. for 80 minutes. After the completion of the residual polymerization, the stirring was stopped, and the contents were allowed to settle and settle. The supernatant was removed so that the solution volume was 1500 L, 12.7 kg of triisobutylaluminum was added, 3974 L of hexane was added again, and the mixture was stirred, then allowed to settle and settle, and the supernatant was removed so that the solution volume was 1500 L. To this solution, 8.9 kg of triisobutylaluminum (42.9 kg of a hexane solution with a concentration of 20.8% by mass) and 205 L of hexane were added. Thereafter, the reaction solution was transferred to a dryer and dried at 40° C. for 9 hours. As a result, 465 kg of a dry prepolymerized catalyst was obtained. The prepolymerization ratio (amount of prepolymerized polymer divided by amount of solid catalyst) was 2.10. This prepolymerized catalyst was designated as Catalyst 1.

[0134] <Polymerization> A 20L autoclave was dried thoroughly in advance by passing nitrogen through it under heating, and then the inside of the vessel was replaced with propylene and cooled to room temperature. 18.7mL of a heptane solution of triisobutylaluminum (140mg / mL) and 0.85N(normal)L of H2 were introduced, followed by 5000g of liquid propylene, and the temperature was raised to 63°C. Then, 230mg of the catalyst 1, excluding the prepolymerized polymer, was pumped into the polymerization vessel with high-pressure argon to start polymerization, and the temperature was raised quickly to 70°C. The temperature was kept at 70°C, and after 1 hour from the start of polymerization, the unreacted propylene was quickly purged to stop the polymerization. As a result, about 1730g of polymer powder (PP-1) was obtained. The catalytic activity was 7520 g-PP / g-catalyst, and the MFR was 8.5 g / 10 min.

[0135] [Production Example 2 (Production of PP-2)] <Polymerization> A 20L autoclave was dried thoroughly in advance by passing nitrogen through it under heating, and then the inside of the vessel was replaced with propylene and cooled to room temperature. 18.7mL of a heptane solution of triisobutylaluminum (140mg / mL) and 0.68N(normal)L of H2 were introduced, followed by 5000g of liquid propylene, and the temperature was raised to 63°C. Then, 310mg of the catalyst 1, excluding the prepolymerized polymer, was pumped into the polymerization vessel with high-pressure argon to start polymerization, and the temperature was raised quickly to 70°C. The temperature was kept at 70°C, and after 1 hour from the start of polymerization, the unreacted propylene was quickly purged to stop the polymerization. As a result, about 22170g of polymer powder (PP-2) was obtained. The catalytic activity was 7000 g-PP / g-catalyst, and the MFR was 3.1 g / 10 min.

[0136] <Pellet manufacturing> [Production of (X1-1)] 100 parts by mass of polymer powder (PP-1) was blended with 0.125 parts by mass of tetrakis[methylene-3-(3',5'-di-t-butyl-4'-hydroxyphenyl)propionate]methane (product name: IRGANOX1010, manufactured by BASF Japan Ltd.), which is a phenol-based antioxidant, and 0.125 parts by mass of tris(2,4-di-t-butylphenyl)phosphite (product name: IRGAFOS 168, manufactured by BASF Japan Ltd.), which is a phosphite-based antioxidant, and mixed for 3 minutes at room temperature using a high-speed stirring mixer (Henschel mixer, product name), and then melt-kneaded using a twin-screw extruder to obtain pellets (X1-1) of polypropylene resin (X1). The twin-screw extruder used was a Technobel KZW-25, with a screw rotation speed of 400 RPM and mixing temperatures set at 80°C, 160°C, 210v, and 230°C from the bottom of the hopper (the same temperature was maintained from then until the die exit).

[0137] [Production of (X1-2)] Pellets (X1-2) were obtained by the same production method as for (X1-1) except that polymer powder (PP-2) was used.

[0138] For pellets (X1-1) and (X1-2), MFR, 13 The C-NMR, GPC, branching index g', and melt tension (MT) were evaluated. The evaluation results are shown in Table 1.

[0139] [Table 1]

[0140] (2) Polypropylene resin (X2) Any of the polymers (X2-1) to (X2-3) produced in the following Production Examples 3 to 5 was used.

[0141] [Production Example 3 (Production of PP-3)] Polymerization was carried out in the same manner as in Production Example 1, except that H2 was 1.28 N (normal) L and the mass of Catalyst 1 was 220 mg excluding the prepolymerized polymer. As a result, about 2508 g of polymer powder (PP-3) was obtained. The catalytic activity was 11,400 g-PP / g-catalyst, and the MFR was 60 g / 10 min.

[0142] [Production Example 4 (Production of PP-4)] In Production Example 4, the following polymerization was carried out instead of the polymerization in Production Example 1. 3 In a stirred high-pressure reactor (L / D=1.2), 2×10 liquefied propylene was added. 4 The flow rates of the polymerization catalyst 1 were continuously fed at a rate of 1.00 kg / hr, excluding the mass of the prepolymerized polymer, triisobutylaluminum at 80 kg / hr, H2 at 0.13 kg / hr, and prepolymerization catalyst 1 at 1.00 kg / hr, the temperature was kept at 70±0.1°C, and continuous polymerization was carried out so that the polymer slurry concentration in the polymerization reactor was kept at 40% by mass. As a result, polymer powder (PP-4) was obtained. The production amount of the polymer powder (PP-4) was 8.0×10 3 kg / hr.

[0143] [Production Example 5 (Production of PP-5)] Polymerization was carried out in the same manner as in Production Example 3, except that H2 was 1.105 N (normal) L and the amount of catalyst 1 was 190 mg, excluding the mass of the prepolymerized polymer. As a result, about 1997 g of polymer powder (PP-5) was obtained. The catalytic activity was 10510 g-PP / g-catalyst, and the MFR was 32 g / 10 min.

[0144] <Pellet manufacturing> [Production of (X2-1)] 100 parts by mass of polymer powder (PP-3) was blended with 0.125 parts by mass of tetrakis[methylene-3-(3',5'-di-t-butyl-4'-hydroxyphenyl)propionate]methane (product name: IRGANOX1010, manufactured by BASF Japan Ltd.), which is a phenol-based antioxidant, and 0.125 parts by mass of tris(2,4-di-t-butylphenyl)phosphite (product name: IRGAFOS 168, manufactured by BASF Japan Ltd.), which is a phosphite-based antioxidant, and mixed for 3 minutes at room temperature using a high-speed stirring mixer (Henschel mixer, product name), and then melt-kneaded using a twin-screw extruder to obtain pellets (X2-1) of polypropylene resin (X2). The twin-screw extruder used was a Technobel KZW-25, with a screw rotation speed of 400 RPM and mixing temperatures set at 80°C, 160°C, 210°C, and 230°C from the bottom of the hopper (the same temperature was maintained from then until the die exit).

[0145] [Production of (X2-2)] Pellets (X2-2) were obtained by the same production method as for (X2-1) except that polymer powder (PP-4) was used. [Production of (X2-3)] Pellets (X2-3) were obtained by the same production method as for (X2-1) except that the polymer powder (PP-5) was used.

[0146] For pellets (X2-1) to (X2-3), MFR, 13 The C-NMR, GPC, branching index g', and melt tension (MT) were evaluated. The evaluation results are shown in Table 2.

[0147] [Table 2]

[0148] (3) Polypropylene resin (Y) As the polypropylene resin (Y), any one of the following polypropylenes (Y-1) to (Y-4) was used. The MFR and melt tension (MT170°C) of these (Y-1) to (Y-4) were evaluated. The evaluation results and the catalysts used are shown in Table 3. In Table 3, the MT170°C of (Y-1) to (Y-4) was below the detection limit, so it was set to less than 0.1.

[0149] (Y-1) [Production Example 3 (Production of Y-1)]: 100 parts by mass of a propylene-ethylene random copolymer (ethylene content = 3.2 mass%, MFR = 25g / 10 min, Tm = 125 ° C.) produced by a metallocene catalyst, trade name "Wintec (registered trademark) WSX03" manufactured by Japan Polypropylene Corporation, was added with 0.05 parts by mass of an organic peroxide (2,5-dimethyl-2,5-di(t-butylperoxy)hexane) and mixed with a Henschel mixer. The mixture was then melt extruded using a Technovel "KZW-25" twin-screw extruder with a screw diameter of 25 mm at a screw rotation speed of 300 rpm and a kneading temperature of C1 / C2 / C3-C7 / head / die = 150 ° C. / 180 ° C. / 230 ° C. / 230 ° C. / 180 ° C. from the bottom of the hopper to obtain pellets with Tm = 125 ° C. and MFR = 45g / 10 min.

[0150] (Y-2): Japan Polypropylene Corporation, product name "Novatec (registered trademark) SA08", propylene homopolymer produced by Ziegler-Natta catalyst, MFR = 80g / 10min, Tm = 161°C (Y-3): Japan Polypropylene Corporation, product name "Wintech (registered trademark) WSX03", propylene homopolymer by metallocene catalyst, MFR = 25g / 10min, Tm = 125°C (Y-4): Japan Polypropylene Corporation, product name "Wintech (registered trademark) WFX4", propylene homopolymer by metallocene catalyst, MFR = 7g / 10min, Tm = 125°C

[0151] [Table 3]

[0152] [Example 1] 1.Formulation The polypropylene resin (X1) was 10 mass% (X1-1), the polypropylene resin (X2) was 40 mass% (X2-1), and the polypropylene-based resin (Y) was 50 mass% (Y-1), and these were weighed out and charged into a Henschel mixer and mixed with stirring for 3 minutes. 2. Granulation Using a Technobel "KZW-25" twin screw extruder with a screw diameter of 25 mm, the screw rotation speed was 300 rpm, and the kneading temperature was C1 / C2 / C3-C7 / head / die = 150°C / 180°C / 230°C / 230°C / 180°C from the bottom of the hopper, melt kneading was performed, and the molten resin extruded from the strand die was taken while being cooled and solidified in a cooling water tank, and the strand was cut into a diameter of 3 mm and a length of 2 mm using a strand cutter, thereby obtaining pellets of a polypropylene resin composition. The MFR of the obtained pellets was evaluated. 3. Film manufacturing The obtained pellets of the polypropylene resin composition were extruded from a 560 mm wide T-die attached to an extruder with a diameter of 90 mmφ at a resin temperature of 290° C. to obtain a film. The extrusion lamination moldability of the polypropylene resin composition and the physical properties of the film were evaluated.

[0153] [Example 2] A film was produced in the same manner as in Example 1, except that the polypropylene resin (X1) was 10 mass% (X1-1), the polypropylene resin (X2) was 20 mass% (X2-1), and the polypropylene resin (Y) was 70 mass% (Y-1).

[0154] [Example 3] A film was produced in the same manner as in Example 1, except that the polypropylene resin (X1) was 10 mass% (X1-1), the polypropylene resin (X2) was 80 mass% (X2-1), and the polypropylene resin (Y) was 10 mass% (Y-1).

[0155] [Example 4] A film was produced in the same manner as in Example 1, except that the polypropylene resin (X1) was 10 mass% (X1-1), the polypropylene resin (X2) was 40 mass% (X2-1), and the polypropylene resin (Y) was 50 mass% (Y-3).

[0156] [Example 5] A film was produced in the same manner as in Example 1, except that the polypropylene resin (X1) was 20 mass% (X1-1), the polypropylene resin (X2) was 30 mass% (X2-1), and the polypropylene resin (Y) was 50 mass% (Y-1).

[0157] [Example 6] A film was produced in the same manner as in Example 1, except that the polypropylene resin (X1) was 5 mass% (X1-2), the polypropylene resin (X2) was 45 mass% (X2-1), and the polypropylene resin (Y) was 50 mass% (Y-1).

[0158] [Example 7] A film was produced in the same manner as in Example 1, except that the polypropylene resin (X1) was 2.5 mass% (X1-2), the polypropylene resin (X2) was 27.5 mass% (X2-2), and the polypropylene resin (Y) was 70 mass% (Y-1).

[0159] [Example 8] A film was produced in the same manner as in Example 1, except that the polypropylene resin (X1) was 5% by mass of (X1-2), the polypropylene resin (X2) was 25% by mass of (X2-3), and the polypropylene resin (Y) was 70% by mass of (Y-1).

[0160] [Comparative Example 1] A film was produced in the same manner as in Example 1, except that the polypropylene resin (X1) was (X1-1) at 30 mass %, and the polypropylene resin (Y) was (Y-2) at 70 mass %.

[0161] [Comparative Example 2] A film was produced in the same manner as in Example 1, except that the polypropylene resin (X2) was 50 mass % (X2-1) and the polypropylene resin (Y) was 50 mass % (Y-4).

[0162] Table 4 shows the proportions of the resins in the examples and comparative examples, the MFR of the pellets of the polypropylene resin composition, extrusion lamination moldability, and the evaluation results of the physical properties of the films.

[0163] [Table 4]

[0164] In the extrusion laminate moldability of Examples 1 to 8, the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene resin (Y) contained in the polypropylene resin composition all satisfied the specific physical properties of the present invention, so that the extensibility was good. In addition, both the neck-in and transparency were excellent. Comparative Example 1 did not contain polypropylene resin (X2) and did not have a polypropylene component with a branched structure with high fluidity, so even when mixed with polypropylene resin (Y-2) with high fluidity, the extensibility was low, the melt tension was insufficient, and the neck-in was large. Comparative Example 2 did not contain polypropylene resin (X1) and the fluidity of polypropylene resin (Y-4) was low, so the neck-in was good, but the extensibility was extremely low.

Claims

1. A polypropylene resin (X1) having the following properties (X1-1) to (X1-6), A polypropylene resin (X2) having the following properties (X2-1) to (X2-6), A polypropylene resin composition comprising a polypropylene resin (Y) having the following properties (Y-1) to (Y-2): (X1-1) The MFR (230° C., load 2.16 kgf) is more than 0.5 g / 10 min and 80 g / 10 min or less. (X1-2) The ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn), as determined by GPC, is 2.0 or more and 5.0 or less, and the ratio (Mz / Mw) of the Z average molecular weight (Mz) to the weight average molecular weight (Mw) is 2.0 or more and 5.0 or less. (X1-3) The proportion of components having a molecular weight of 1 million or more in an integral molecular weight distribution curve obtained by GPC (W １Ｍ ) is 0.5 mass% or more. (X1-4) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation 1). log (MT170 ° C.) ≧ −1.1 × log (MFR) + 2.0 (Formula 1) (X1-5) Branching index g' (Mz ａｂｓ ) is equal to or greater than 0.70 and equal to or less than 0.

95. (X1-6) １３ The triad fraction (mm) of consecutive propylene units determined by C-NMR is 95% or more. (X2-1) The MFR (230° C., load 2.16 kgf) is more than 0.5 g / 10 min and 80 g / 10 min or less. (X2-2) The ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) obtained by GPC is 2.0 or more and 5.0 or less, and the ratio (Mz / Mw) of the Z average molecular weight (Mz) to the weight average molecular weight (Mw) is 2.0 or more and 5.0 or less. (X2-3) The proportion of components having a molecular weight of 1,000,000 or more in an integral molecular weight distribution curve obtained by GPC (W １Ｍ ) is 0.5 mass% or more. (X2-4) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation 1). log (MT170 ° C.) ≧ −1.1 × log (MFR) + 2.0 (Formula 1) (X2-5) Branching index g' (Mz ａｂｓ ) is equal to or greater than 0.70 and equal to or less than 0.

95. (X2-6) １３ The triad fraction (mm) of consecutive propylene units determined by C-NMR is 95% or more. However, MFR of X1 < MFR of X2, W of X1 １Ｍ ≧X2W １Ｍ It is. (Y-1) MFR (230° C., load 2.16 kgf) is 10 g / 10 min or more and 50 g / 10 min or less. (Y-2) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (formula A). log(MT170℃)<-1.1×log(MFR)+2.0 (Formula A)

2. The polypropylene-based resin composition according to claim 1, comprising 5% by mass to 30% by mass of a polypropylene resin (X1), 5% by mass to 50% by mass of a polypropylene resin (X2), and 20% by mass to 80% by mass of a polypropylene-based resin (Y) (wherein the total amount of the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene-based resin (Y) is 100% by mass).

3. The polypropylene resin (X1) has the following properties (X1-1) and (X1-3), The polypropylene resin composition according to claim 1 or 2, wherein the polypropylene resin (X2) has the following properties (X2-1) and (X2-3). (X1-1) The MFR (230° C., load 2.16 kgf) is more than 0.5 g / 10 min and 30 g / 10 min or less. (X1-3) The proportion of components having a molecular weight of 1 million or more in an integral molecular weight distribution curve obtained by GPC (W １Ｍ ) is 2.5 mass% or more. (X2-1) The MFR (230° C., load 2.16 kgf) is more than 30 g / 10 min and 80 g / 10 min or less. (X2-3) The proportion of components having a molecular weight of 1,000,000 or more in an integral molecular weight distribution curve obtained by GPC (W １Ｍ ) is 0.5 mass % or more and less than 2.5 mass %.

4. The polypropylene resin (X1) has the following properties (X1-1) and (X1-3), The polypropylene resin composition according to claim 1, wherein the polypropylene resin (X2) has the following properties (X2-1) and (X2-3). (X1-1) The MFR (230° C., load 2.16 kgf) is more than 0.5 g / 10 min and is 10 g / 10 min or less. (X1-3) The proportion of components having a molecular weight of 1 million or more in an integral molecular weight distribution curve obtained by GPC (W １Ｍ ) is 3.5 mass% or more. (X2-1) The MFR (230° C., load 2.16 kgf) is more than 10 g / 10 min and 80 g / 10 min or less. (X2-3) The proportion of components having a molecular weight of 1,000,000 or more in an integral molecular weight distribution curve obtained by GPC (W １Ｍ ) is 0.5 mass % or more and less than 3.5 mass %.

5. The polypropylene-based resin composition according to claim 1 or 4, comprising 2% by mass to 30% by mass of a polypropylene resin (X1), 5% by mass to 80% by mass of a polypropylene resin (X2), and 10% by mass to 80% by mass of a polypropylene-based resin (Y) (wherein the total amount of the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene-based resin (Y) is 100% by mass).

6. The polypropylene resin composition according to any one of claims 1 to 5, which is for extrusion lamination.

7. A step of obtaining a polypropylene resin (X1) having the following properties (X1-1) to (X1-6): A step of obtaining a polypropylene resin (X2) having the following properties (X2-1) to (X2-6): A step of obtaining a polypropylene-based resin (Y) having the following properties (Y-1) to (Y-2); a step of mixing or melt-kneading the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene-based resin (Y); A method for producing a polypropylene-based resin composition comprising the steps of: (X1-1) The MFR (230° C., load 2.16 kgf) is more than 0.5 g / 10 min and 80 g / 10 min or less. (X1-2) The ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn), as determined by GPC, is 2.0 or more and 5.0 or less, and the ratio (Mz / Mw) of the Z average molecular weight (Mz) to the weight average molecular weight (Mw) is 2.0 or more and 5.0 or less. (X1-3) The proportion of components having a molecular weight of 1 million or more in an integral molecular weight distribution curve obtained by GPC (W １Ｍ ) is 0.5 mass% or more. (X1-4) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation 1). log (MT170 ° C.) ≧ −1.1 × log (MFR) + 2.0 (Formula 1) (X1-5) Branching index g' (Mz ａｂｓ ) is equal to or greater than 0.70 and equal to or less than 0.

95. (X1-6) １３ The triad fraction (mm) of consecutive propylene units determined by C-NMR is 95% or more. (X2-1) The MFR (230° C., load 2.16 kgf) is more than 0.5 g / 10 min and 80 g / 10 min or less. (X2-2) The ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) obtained by GPC is 2.0 or more and 5.0 or less, and the ratio (Mz / Mw) of the Z average molecular weight (Mz) to the weight average molecular weight (Mw) is 2.0 or more and 5.0 or less. (X2-3) The proportion of components having a molecular weight of 1,000,000 or more in an integral molecular weight distribution curve obtained by GPC (W １Ｍ ) is 0.5 mass% or more. (X2-4) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation 1). log (MT170 ° C.) ≧ −1.1 × log (MFR) + 2.0 (Formula 1) (X2-5) Branching index g' (Mz ａｂｓ ) is equal to or greater than 0.70 and equal to or less than 0.

95. (X2-6) １３ The triad fraction (mm) of consecutive propylene units determined by C-NMR is 95% or more. However, MFR of X1 < MFR of X2, W of X1 １Ｍ ≧X2W １Ｍ It is. (Y-1) MFR (230° C., load 2.16 kgf) is 10 g / 10 min or more and 50 g / 10 min or less. (Y-2) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (formula A). log(MT170℃)<-1.1×log(MFR)+2.0 (Formula A)

8. The method for producing a polypropylene-based resin composition according to claim 7, wherein the mixing or melt-kneading step is a step of mixing or melt-kneading 5% by mass to 30% by mass of the polypropylene resin (X1), 5% by mass to 50% by mass of the polypropylene resin (X2), and 20% by mass to 80% by mass of the polypropylene-based resin (Y) (wherein the total amount of the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene-based resin (Y) is 100% by mass).

9. The polypropylene resin (X1) has the following properties (X1-1) and (X1-3), The method for producing a polypropylene resin composition according to claim 7 or 8, wherein the polypropylene resin (X2) has the following properties (X2-1) and (X2-3): (X1-1) The MFR (230° C., load 2.16 kgf) is more than 0.5 g / 10 min and 30 g / 10 min or less. (X1-3) The proportion of components having a molecular weight of 1 million or more in an integral molecular weight distribution curve obtained by GPC (W １Ｍ ) is 2.5 mass% or more. (X2-1) The MFR (230° C., load 2.16 kgf) is more than 30 g / 10 min and 80 g / 10 min or less. (X2-3) The proportion of components having a molecular weight of 1,000,000 or more in an integral molecular weight distribution curve obtained by GPC (W １Ｍ ) is 0.5 mass % or more and less than 2.5 mass %.

10. The polypropylene resin (X1) has the following properties (X1-1) and (X1-3), The method for producing a polypropylene resin composition according to claim 7, wherein the polypropylene resin (X2) has the following properties (X2-1) and (X2-3): (X1-1) The MFR (230° C., load 2.16 kgf) is more than 0.5 g / 10 min and is 10 g / 10 min or less. (X1-3) The proportion of components having a molecular weight of 1 million or more in an integral molecular weight distribution curve obtained by GPC (W １Ｍ ) is 3.5 mass% or more. (X2-1) The MFR (230° C., load 2.16 kgf) is more than 10 g / 10 min and 80 g / 10 min or less. (X2-3) The proportion of components having a molecular weight of 1,000,000 or more in an integral molecular weight distribution curve obtained by GPC (W １Ｍ ) is 0.5 mass % or more and less than 3.5 mass %.

11. The method for producing a polypropylene-based resin composition according to claim 7 or 10, wherein the mixing or melt-kneading step is a step of mixing or melt-kneading 2% by mass to 30% by mass of the polypropylene resin (X1), 5% by mass to 80% by mass of the polypropylene resin (X2), and 10% by mass to 80% by mass of the polypropylene-based resin (Y) (wherein the total amount of the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene-based resin (Y) is 100% by mass).

12. The method for producing the polypropylene resin composition according to any one of claims 7 to 11, which is for extrusion lamination.

13. A laminate including a base layer and a polypropylene-based resin composition layer, The polypropylene-based resin composition layer is a laminate comprising a polypropylene resin (X1) having the following properties (X1-1) to (X1-6), a polypropylene resin (X2) having the following properties (X2-1) to (X2-6), and a polypropylene resin (Y) having the following properties (Y-1) to (Y-2). (X1-1) The MFR (230° C., load 2.16 kgf) is more than 0.5 g / 10 min and 80 g / 10 min or less. (X1-2) The ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn), as determined by GPC, is 2.0 or more and 5.0 or less, and the ratio (Mz / Mw) of the Z average molecular weight (Mz) to the weight average molecular weight (Mw) is 2.0 or more and 5.0 or less. (X1-3) The proportion of components having a molecular weight of 1 million or more in an integral molecular weight distribution curve obtained by GPC (W １Ｍ ) is 0.5 mass% or more. (X1-4) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation 1). log (MT170 ° C.) ≧ −1.1 × log (MFR) + 2.0 (Formula 1) (X1-5) Branching index g' (Mz ａｂｓ ) is equal to or greater than 0.70 and equal to or less than 0.

95. (X1-6) １３ The triad fraction (mm) of consecutive propylene units determined by C-NMR is 95% or more. (X2-1) The MFR (230° C., load 2.16 kgf) is more than 0.5 g / 10 min and 80 g / 10 min or less. (X2-2) The ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) obtained by GPC is 2.0 or more and 5.0 or less, and the ratio (Mz / Mw) of the Z average molecular weight (Mz) to the weight average molecular weight (Mw) is 2.0 or more and 5.0 or less. (X2-3) The proportion of components having a molecular weight of 1,000,000 or more in an integral molecular weight distribution curve obtained by GPC (W １Ｍ ) is 0.5 mass% or more. (X2-4) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation 1). log (MT170 ° C.) ≧ −1.1 × log (MFR) + 2.0 (Formula 1) (X2-5) Branching index g' (Mz ａｂｓ ) is equal to or greater than 0.70 and equal to or less than 0.

95. (X2-6) １３ The triad fraction (mm) of consecutive propylene units determined by C-NMR is 95% or more. However, MFR of X1 < MFR of X2, W of X1 １Ｍ ≧X2W １Ｍ It is. (Y-1) MFR (230° C., load 2.16 kgf) is 10 g / 10 min or more and 50 g / 10 min or less. (Y-2) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (formula A). log(MT170℃)<-1.1×log(MFR)+2.0 (Formula A)

14. The polypropylene-based resin composition layer contains 5% by mass to 30% by mass of the polypropylene resin (X1), 5% by mass to 50% by mass of the polypropylene resin (X2), and 20% by mass to 80% by mass of the polypropylene-based resin (Y) (wherein the total amount of the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene-based resin (Y) is 100% by mass).

15. The polypropylene resin (X1) has the following properties (X1-1) and (X1-3), The laminate according to claim 13 or 14, wherein the polypropylene resin (X2) has the following properties (X2-1) and (X2-3). (X1-1) The MFR (230° C., load 2.16 kgf) is more than 0.5 g / 10 min and 30 g / 10 min or less. (X1-3) The proportion of components having a molecular weight of 1 million or more in an integral molecular weight distribution curve obtained by GPC (W １Ｍ ) is 2.5 mass% or more. (X2-1) The MFR (230° C., load 2.16 kgf) is more than 30 g / 10 min and 80 g / 10 min or less. (X2-3) The proportion of components having a molecular weight of 1,000,000 or more in an integral molecular weight distribution curve obtained by GPC (W １Ｍ ) is 0.5 mass % or more and less than 2.5 mass %.

16. The polypropylene resin (X1) has the following properties (X1-1) and (X1-3), The laminate according to claim 13, wherein the polypropylene resin (X2) has the following properties (X2-1) and (X2-3). (X1-1) The MFR (230° C., load 2.16 kgf) is more than 0.5 g / 10 min and is 10 g / 10 min or less. (X1-3) The proportion of components having a molecular weight of 1 million or more in an integral molecular weight distribution curve obtained by GPC (W １Ｍ ) is 3.5 mass% or more. (X2-1) The MFR (230° C., load 2.16 kgf) is more than 10 g / 10 min and 80 g / 10 min or less. (X2-3) The proportion of components having a molecular weight of 1,000,000 or more in an integral molecular weight distribution curve obtained by GPC (W １Ｍ ) is 0.5 mass % or more and less than 3.5 mass %.

17. The polypropylene-based resin composition layer contains 2% by mass to 30% by mass of the polypropylene resin (X1), 5% by mass to 80% by mass of the polypropylene resin (X2), and 10% by mass to 80% by mass of the polypropylene-based resin (Y) (wherein the total amount of the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene-based resin (Y) is 100% by mass).

18. A method for producing a laminate including a base layer and a polypropylene-based resin composition layer, comprising: A method for producing a laminate, comprising the step of extrusion laminating, on at least one surface of a base layer, a mixture or melt-kneaded product of a polypropylene resin (X1) having the following properties (X1-1) to (X1-6), a polypropylene resin (X2) having the following properties (X2-1) to (X2-6), and a polypropylene-based resin (Y) having the following properties (Y-1) to (Y-2), to form the polypropylene-based resin composition layer. (X1-1) The MFR (230° C., load 2.16 kgf) is more than 0.5 g / 10 min and 80 g / 10 min or less. (X1-2) The ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn), as determined by GPC, is 2.0 or more and 5.0 or less, and the ratio (Mz / Mw) of the Z average molecular weight (Mz) to the weight average molecular weight (Mw) is 2.0 or more and 5.0 or less. (X1-3) The proportion of components having a molecular weight of 1 million or more in an integral molecular weight distribution curve obtained by GPC (W １Ｍ ) is 0.5 mass% or more. (X1-4) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation 1). log (MT170 ° C.) ≧ −1.1 × log (MFR) + 2.0 (Formula 1) (X1-5) Branching index g' (Mz ａｂｓ ) is equal to or greater than 0.70 and equal to or less than 0.

95. (X1-6) １３ The triad fraction (mm) of consecutive propylene units determined by C-NMR is 95% or more. (X2-1) The MFR (230° C., load 2.16 kgf) is more than 0.5 g / 10 min and 80 g / 10 min or less. (X2-2) The ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) obtained by GPC is 2.0 or more and 5.0 or less, and the ratio (Mz / Mw) of the Z average molecular weight (Mz) to the weight average molecular weight (Mw) is 2.0 or more and 5.0 or less. (X2-3) The proportion of components having a molecular weight of 1,000,000 or more in an integral molecular weight distribution curve obtained by GPC (W １Ｍ ) is 0.5 mass% or more. (X2-4) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (Equation 1). log (MT170 ° C.) ≧ −1.1 × log (MFR) + 2.0 (Formula 1) (X2-5) Branching index g' (Mz ａｂｓ ) is equal to or greater than 0.70 and equal to or less than 0.

95. (X2-6) １３ The triad fraction (mm) of consecutive propylene units determined by C-NMR is 95% or more. However, MFR of X1 < MFR of X2, W of X1 １Ｍ ≧X2W １Ｍ It is. (Y-1) MFR (230° C., load 2.16 kgf) is 10 g / 10 min or more and 50 g / 10 min or less. (Y-2) The melt tension (MT170°C) (unit: g) measured at 170°C satisfies the requirement of the following (formula A). log(MT170℃)<-1.1×log(MFR)+2.0 (Formula A)

19. The method for producing a laminate according to claim 18, wherein the step of forming the polypropylene-based resin composition layer is a step of forming the polypropylene-based resin composition layer by extrusion laminating a mixture or melt-kneaded product of 5% by mass to 30% by mass of the polypropylene resin (X1), 5% by mass to 50% by mass of the polypropylene resin (X2), and 20% by mass to 80% by mass of the polypropylene resin (Y) (wherein the total amount of the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene resin (Y) is 100% by mass).

20. The polypropylene resin (X1) has the following properties (X1-1) and (X1-3), The method for producing a laminate according to claim 18 or 19, wherein the polypropylene resin (X2) has the following properties (X2-1) and (X2-3): (X1-1) The MFR (230° C., load 2.16 kgf) is more than 0.5 g / 10 min and 30 g / 10 min or less. (X1-3) The proportion of components having a molecular weight of 1 million or more in an integral molecular weight distribution curve obtained by GPC (W １Ｍ ) is 2.5 mass% or more. (X2-1) The MFR (230° C., load 2.16 kgf) is more than 30 g / 10 min and 80 g / 10 min or less. (X2-3) The proportion of components having a molecular weight of 1,000,000 or more in an integral molecular weight distribution curve obtained by GPC (W １Ｍ ) is 0.5 mass % or more and less than 2.5 mass %.

21. The polypropylene resin (X1) has the following properties (X1-1) and (X1-3), The method for producing a laminate according to claim 18, wherein the polypropylene resin (X2) has the following properties (X2-1) and (X2-3): (X1-1) The MFR (230° C., load 2.16 kgf) is more than 0.5 g / 10 min and is 10 g / 10 min or less. (X1-3) The proportion of components having a molecular weight of 1 million or more in an integral molecular weight distribution curve obtained by GPC (W １Ｍ ) is 3.5 mass% or more. (X2-1) The MFR (230° C., load 2.16 kgf) is more than 10 g / 10 min and 80 g / 10 min or less. (X2-3) The proportion of components having a molecular weight of 1,000,000 or more in an integral molecular weight distribution curve obtained by GPC (W １Ｍ ) is 0.5 mass % or more and less than 3.5 mass %.

22. The method for producing a laminate according to claim 18 or 21, wherein the step of forming the polypropylene-based resin composition layer is a step of forming the polypropylene-based resin composition layer by extrusion laminating a mixture or melt-kneaded product of 2% by mass to 30% by mass of the polypropylene resin (X1), 5% by mass to 80% by mass of the polypropylene resin (X2), and 10% by mass to 80% by mass of the polypropylene resin (Y) (wherein the total amount of the polypropylene resin (X1), the polypropylene resin (X2), and the polypropylene-based resin (Y) is 100% by mass).

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