Propylene resin composition and injection molded article comprising the same

Abstract

To prevent the sink of a cup-shaped package produced by the injection molding of a propylene resin composition and to improve transparency.SOLUTION: By using a propylene resin composition containing a specific polypropylene resin (X) and a specific propylene-based random copolymer (Y), the obtained injection molded article, particularly a cup-shaped package having a body portion and a flange, can prevent sink marks on the flange, and the transparency of the package can be improved.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a propylene resin composition and an injection-molded article made thereof, and more particularly to a cup-shaped packaging body having a body and a flange, which is produced by injection molding using a propylene resin composition. [Background technology]

[0002] It is known that when a propylene resin composition is subjected to injection molding, if there are thin and thick portions, sink marks generally occur in the thick portions. In the production of a package by injection molding, particularly a cup-shaped package having a body and a flange, if an attempt is made to reduce the amount of resin required to produce the package by thinning the body, the flange generally becomes a thick portion, and therefore sink marks are particularly likely to occur in the flange. If sink marks occur in the flange, when food is placed in the package and sealed by fusion between the film and the flange, poor heat sealing of the food product occurs, resulting in incomplete sealing. Therefore, various studies have been conducted to eliminate this sink mark. Patent Document 1 discloses a polypropylene resin container having a body thickness of 0.2 mm or more and 0.35 mm or less and a flange thickness of 0.4 mm or more and 0.7 mm or less, but does not take this problem into consideration at all and does not reach a solution. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-075677 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0004] An object of the present disclosure is to provide a polypropylene resin composition that can reduce the amount of resin required to manufacture a package, particularly a cup-shaped package having a body and a flange, when injection-molding the package, and can suppress the occurrence of sink marks, particularly on the flange, of the cup-shaped package having a body and a flange, and can also provide an injection-molded article made of the polypropylene resin composition, particularly a cup-shaped package having a body and a flange, that has transparency. [Means for solving the problem]

[0005] A first aspect of the present disclosure is a propylene resin composition comprising a polypropylene resin (X) that satisfies the following (Xi) to (X-vii) and a propylene-based random copolymer (Y) that satisfies the following (Yi): (Xi) The melt flow rate (MFR) is 0.1 to 35 g / 10 min. (X-ii) The molecular weight distribution (Mw / Mn) determined by gel permeation chromatography (GPC) is 3.0 to 10. (X-iii) The melt tension (MT) is 5 to 50 gf. (X-iv) The amount of paraxylene soluble components (CXS) is 0.01% by weight or more and less than 5% by weight. (Xv) The molecular weight distribution (Mz / Mw) is 3.0 to 10. (X-vi) Melt tension (MT) is Log(MT)≧-0.9×log(MFR)+0.7 Or MT≧15 is satisfied. (X-vii) The branching index (g') is 0.3 to 1. (Yi) The melt flow rate (MFR) is 40 to 150 g / 10 min.

[0006] A second aspect of the present disclosure is the propylene resin composition according to the first aspect, wherein the polypropylene resin (X) is 10 to 50% by weight and the propylene random copolymer (Y) is 50 to 90% by weight (the total of the polypropylene resin (X) and the propylene random copolymer (Y) is 100% by weight).

[0007] A third aspect of the present disclosure is the propylene resin composition according to the first or second aspect, wherein the propylene random copolymer (Y) is a random copolymer of propylene and ethylene, and has a total ethylene content of 0.5 to 5% by weight.

[0008] A fourth aspect of the present disclosure is the propylene resin composition according to any one of the first to third aspects, wherein the mm fraction (mm) of propylene unit triads in the polypropylene resin (X) is 95% or more.

[0009] A fifth aspect of the present disclosure is an injection-molded article made of the propylene resin composition according to any one of the first to fourth aspects.

[0010] A sixth aspect of the present disclosure is the injection-molded body according to the fifth aspect, which is a cup-shaped package having a body and a flange.

[0011] A seventh aspect of the present disclosure is the cup-shaped package according to the sixth aspect, wherein the thickness of the body is 0.3 to 0.7 mm, and the thickness of the flange is 1.2 to 5 times the thickness of the body. [Effects of the Invention]

[0012] When an injection-molded article is produced from the propylene resin composition of any of Aspects 1 to 4, the injection-molded article of Aspect 5 exhibits the effect of being free from sink marks and having high transparency. In particular, when the injection-molded article is a cup-shaped package having a body and a flange, as in Aspect 6, sink marks do not occur in the flange, which results in an effect of preventing heat-sealing defects when heat-sealing the flange of the cup-shaped package with a film. Furthermore, the cup-shaped package having a body and a flange of Aspect 7 exhibits the effect of being thin-walled yet resistant to deformation and having sufficient strength. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a side view of an example of a cup-shaped package having a body and a flange. [Figure 2]1 is a cross-sectional view of an example of a cup-shaped package having a body and a flange. [Figure 3] 1 is a top view of an example of a cup-shaped package having a body and a flange. DETAILED DESCRIPTION OF THE INVENTION

[0014] In the present disclosure, the melt flow rate (hereinafter sometimes abbreviated as "MFR") refers to the melt flow rate measured in accordance with JIS K-7210-1999 under a load of 2.16 kg at 230°C, and expressed in units of "g / 10 min."

[0015] In this disclosure, "Mw" refers to weight average molecular weight.

[0016] In this disclosure, "Mn" refers to the number average molecular weight.

[0017] In this disclosure, "Mz" refers to the Z-average molecular weight.

[0018] In the present disclosure, the "molecular weight distribution (Mw / Mn) determined by gel permeation chromatography (hereinafter sometimes abbreviated as GPC)" refers to the value obtained by dividing Mw by Mn.

[0019] In this disclosure, "molecular weight distribution (Mz / Mw)" refers to the value obtained by dividing Mz by Mw.

[0020] In this disclosure, the unit of "melt tension (MT)" is "gf."

[0021] In the present disclosure, the term "paraxylene soluble component amount (CXS)" refers to the amount of paraxylene soluble component relative to the total amount of polypropylene resin (X).

[0022] In the present disclosure, the "branching index (g')" refers to the value calculated by [η]br / [η]lin, where [η]br is the intrinsic viscosity of the polypropylene resin (X) (referred to as "br" in the explanation of this formula), and [η]lin is the intrinsic viscosity [η]lin of the same type of linear polymer having the same molecular weight as br. The more branched structures there are in the structure of the polypropylene resin (X), the smaller the value of g' becomes. The explanation of g' is given in "Developments in Polymer Characterization-4" (JV Dawkins ed., Applied Science Publishers, 1983).

[0023] In the present disclosure, the "total ethylene content" refers to the proportion of -CH2-CH2- in the propylene-based random copolymer (Y), and is expressed in % by weight.

[0024] In the present disclosure, the "mm fraction (mm) of propylene unit triads" refers to the proportion of propylene units in which the methyl branch direction in each propylene unit is the same among the propylene unit triads in the polypropylene resin (X).

[0025] (1) Polypropylene resin (X) The polypropylene resin (X) of the present invention satisfies the following (Xi) to (X-vii): (Xi) The melt flow rate (MFR) is 0.1 to 35 g / 10 min. (X-ii) The molecular weight distribution (Mw / Mn) determined by gel permeation chromatography (GPC) is 3.0 to 10. (X-iii) The melt tension (MT) is 5 to 50 gf. (X-iv) The amount of paraxylene soluble components (CXS) is 0.01% by weight or more and less than 5% by weight. (Xv) The molecular weight distribution (Mz / Mw) is 3.0 to 10. (X-vi) Melt tension (MT) is Log(MT)≧-0.9×log(MFR)+0.7 Or MT≧15 is satisfied. (X-vii) The branching index (g') is 0.3 to 1.

[0026] As an additional feature of the polypropylene resin (X) used in the present invention, it is preferable that the polypropylene resin (X) has the following properties regarding the mm fraction (mm) of propylene unit triads. The mm fraction (mm) of propylene unit triads in polypropylene resin (X) is 95% or more.

[0027] (1-1) Melt flow rate (MFR) The melt flow rate (MFR) of the polypropylene resin (X) used in the present invention must be in the range of 0.1 to 35 g / 10 min, preferably 0.3 to 25.0 g / 10 min, more preferably 0.5 to 20.0 g / 10 min, even more preferably 0.7 to 15 g / 10 min, and particularly preferably 1 to 10 g / 10 min. By setting the MFR of the polypropylene resin (X) in this range, the propylene resin composition of the present invention maintains appropriate fluidity, exhibits good moldability, and has appropriate melt tension. That is, polypropylene resins (X) with an MFR below this range exhibit insufficient fluidity, which can lead to manufacturing problems such as excessive extruder load during various molding processes. On the other hand, polypropylene resins (X) with an MFR above this range may exhibit insufficient melt tension (viscosity), making it difficult to obtain thin-walled injection-molded articles with sufficient strength. As mentioned above, the MFR was measured in accordance with JIS K-7210-1999 under a load of 2.16 kg at 230° C., and the unit is g / 10 min.

[0028] The MFR of the polypropylene resin (X) can be adjusted by adjusting the polymerization conditions of the polypropylene resin (X), such as temperature and pressure, and by controlling the amount of a chain transfer agent such as hydrogen added during polymerization. By increasing the temperature during polymerization of the polypropylene resin (X), the MFR of the polypropylene resin (X) can be reduced. By increasing the pressure during polymerization of the polypropylene resin, the MFR of the polypropylene resin (X) can be increased. The MFR of polypropylene resin (X) can be increased by increasing the amount of chain transfer agent such as hydrogen added during polymerization of the polypropylene resin. That is, when hydrogen is used as a chain transfer agent, the MFR of polypropylene resin (X) can be increased by increasing the amount of hydrogen added during polymerization of the polypropylene resin.

[0029] (1-2) Molecular weight distribution (Mw / Mn) and molecular weight distribution (Mz / Mw) by GPC The polypropylene resin (X) must have a molecular weight distribution (Mw / Mn) (where Mw is the weight average molecular weight and Mn is the number average molecular weight, hereinafter sometimes abbreviated as "Mw / Mn") of 3.0 or more and 10.0 or less, as determined by gel permeation chromatography (GPC). The molecular weight distribution Mw / Mn of the polypropylene resin (X) is preferably in the range of 3.5 to 8.0, more preferably 4.0 to 6.0. Furthermore, the molecular weight distribution (Mz / Mw) of the polypropylene resin (X) (where Mz is the Z-average molecular weight, hereinafter sometimes abbreviated as "Mz / Mw") must be 3.0 or more and 10.0 or less. The preferred range of Mz / Mw is 3.5 to 8.0, and more preferably 4.0 to 6.0. The wider the molecular weight distribution, the better the molding processability, but those with Mw / Mn and Mz / Mw in this range are particularly excellent in molding processability.

[0030] The definitions of Mn, Mw, and Mz are described in "Fundamentals of Polymer Chemistry" (edited by the Society of Polymer Science, Tokyo Kagaku Dojin, 1978), etc., and can be calculated from a molecular weight distribution curve obtained by GPC. For example, the specific measurement method for GPC used in the examples of this specification is 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: orthodichlorobenzene (ODCB) ·Measurement temperature: 140℃ ·Flow rate: 1.0ml / min ·Injection amount: 0.2ml Sample preparation: Prepare a 1 mg / mL solution of the sample using ODCB (containing 0.5 mg / mL BHT (p-dibutylhydroxytoluene)), and dissolve it at 140°C for approximately 1 hour. The conversion from the retention volume obtained by GPC measurement to molecular weight is carried out using a calibration curve prepared in advance using standard polystyrene (PS). The standard polystyrenes used are all the following brands manufactured by Tosoh Corporation. F380, F288, F128, F80, F40, F20, F10, F4, F1, A5000, A2500, A1000 A calibration curve was created by dissolving each compound in ODCB (containing 0.5 mg / mL of BHT) at 0.5 mg / mL and injecting 0.2 mL of the solution. The calibration curve was calculated using a cubic equation obtained by approximating the curve using the least squares method. The viscosity formula used to convert to molecular weight is [η] = K × M α The following values ​​are used: PS:K = 1.38 × 10 -4 , α=0.7 PP:K = 1.03 × 10 -4 , α=0.78 However, it is possible to measure molecular weight distribution by GPC using equivalent equipment, detectors, columns, etc.

[0031] The molecular weight distribution (Mw / Mn) and molecular weight distribution (Mz / Mw) of the polypropylene resin (X) determined by GPC can be adjusted by adjusting the temperature and pressure, which are polymerization conditions for the polypropylene resin (X), and by controlling the amount of a chain transfer agent such as hydrogen added during polymerization. Increasing the temperature during polymerization of the polypropylene resin (X) increases the molecular weight distribution (Mw / Mn) and molecular weight distribution (Mz / Mw) of the polypropylene resin (X) measured by GPC. Increasing the pressure during polymerization of the polypropylene resin (X) lowers the molecular weight distribution (Mw / Mn) and molecular weight distribution (Mz / Mw) of the polypropylene resin (X) measured by GPC. Increasing the amount of chain transfer agent added during polymerization of polypropylene resin (X) lowers the molecular weight distribution (Mw / Mn) and molecular weight distribution (Mz / Mw) of polypropylene resin (X) measured by GPC. That is, when hydrogen is used as a chain transfer agent, increasing the amount of hydrogen added during polymerization of polypropylene resin (X) lowers the molecular weight distribution (Mw / Mn) and molecular weight distribution (Mz / Mw) of polypropylene resin (X) measured by GPC.

[0032] (1-3) Melt tension (MT) The melt tension (MT) (hereinafter sometimes abbreviated as "MT") of the polypropylene resin (X) used in the present invention must be in the range of 5 to 50 gf, preferably 6 to 40 gf, more preferably 7 to 35 gf, and even more preferably 8 to 30 gf. By setting the MT of the polypropylene resin (X) in this range, the propylene resin composition of the present invention maintains appropriate fluidity and exhibits good moldability, and the resulting injection-molded article can be thin-walled yet maintains good strength, and sink marks do not occur. That is, if the MT of the polypropylene resin (X) is below this range, the resulting injection-molded article may be thin-walled but may not maintain good strength, or sink marks may occur, due to insufficient melt tension. On the other hand, if the MT of the polypropylene resin (X) exceeds this range, the take-up speed may be significantly slowed depending on the measurement method, making measurement difficult and impractical.

[0033] Furthermore, the polypropylene resin (X) must satisfy the following (X-vi). (X-vi) Melt tension (MT) is Log(MT)≧-0.9×log(MFR)+0.7 Or MT≧15 is satisfied. In the examples of this specification, for example, the melt tension measured using a 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, and temperature 230°C is used, and the unit is grams. However, if the MT of the polypropylene resin (X) is extremely high, the resin may break at a take-up speed of 4.0 m / min. In such cases, the take-up speed is reduced, and the tension at the highest possible take-up speed is taken as the MT.

[0034] This definition is an index for ensuring that the propylene resin composition of the present invention maintains appropriate fluidity and exhibits good moldability, and that the resulting injection-molded article maintains good strength despite its thin wall and is capable of suppressing the occurrence of sink marks. Generally, MT has a correlation with MFR, and therefore is described by a relational expression with MFR. Thus, the method of defining MT using a relational expression with MFR is a common method for those skilled in the art. For example, in JP-A Nos. 2003-25425, 2003-64193, and 2003-94504, various relational expressions have been proposed to define polypropylene having a high melt tension.

[0035] If the polypropylene resin (X) satisfies the above (X-vi), it can be said to be a resin with sufficiently high melt tension. That is, by combining the polypropylene resin (X) satisfying the above (X-vi) with the propylene block copolymer (Y) described below, it is particularly useful as a propylene resin composition for obtaining an injection-molded article, particularly a cup-shaped package having a body and a flange. Furthermore, it is more preferable that the polypropylene resin (X) satisfies the following (X-vi)', and even more preferable that the polypropylene resin (X) satisfies the following (X-vi)". (X-vi)' log(MT)≧-0.9×log(MFR)+0.9 or MT≧15 Satisfy one of the following. ·(X-vi)” log(MT)≧-0.9×log(MFR)+1.1 or MT≧15 Satisfy one of the following.

[0036] As mentioned above, the MT of polypropylene resin (X) is closely related to the MFR, and therefore the MT can be adjusted in the same manner as the method for adjusting the MFR of polypropylene resin (X).

[0037] (1-4) Paraxylene solubles (CXS) The polypropylene resin (X) used in the present invention preferably has a high stereoregularity, because the propylene resin composition of the present invention and injection-molded articles made therefrom contain less low-crystalline components that cause stickiness and bleed-out, and can maintain good strength despite thin walls and suppress the occurrence of sink marks. The low-crystalline components are evaluated by the xylene-soluble component content (CXS) (hereinafter sometimes abbreviated as "CXS"), which must be in the range of 0.01 wt% to less than 5 wt% of the total amount of polypropylene resin (X), preferably 3.0 wt% or less, more preferably 1.0 wt% or less, and even more preferably 0.5 wt% or less. While the lower limit is not inherently particularly limited, it is specified to be 0.01 wt% or more, taking into account the lower measurement limit, and preferably 0.03 wt% or more. By setting the CXS in this range, stickiness and bleed-out can be suppressed when the propylene resin composition of the present invention and injection-molded articles made therefrom are made.

[0038] Details of the CXS measurement method in the present application are as follows. 2 g of the sample was dissolved in 300 ml of p-xylene (containing 0.5 mg / ml of BHT) at 130°C to form a solution, which was then left to stand at 25°C for 12 hours. The precipitated polymer was then filtered, and the p-xylene was evaporated from the filtrate. The solution was then dried under reduced pressure at 100°C for 12 hours to recover the components soluble in xylene at room temperature. The weight of this recovered component relative to the weight of the charged sample [wt%] is defined as CXS.

[0039] (1-5) Branching index (g') The branching index (g') (hereinafter sometimes abbreviated as "g'") is a direct indicator of whether the polypropylene resin (X) used in the present invention has a branched structure, and is one of the indicators for indicating that the MFR and MT are within a specific range. The g' of the polypropylene resin (X) used in the present invention must be 0.3 to 1, preferably 0.55 to 0.98, more preferably 0.75 to 0.96, and most preferably 0.8 to 0.95. g' is given by the ratio of the intrinsic viscosity [η]br of the polypropylene resin (X) to the intrinsic viscosity [η]lin of a linear polymer having the same molecular weight, i.e., [η]br / [η]lin, and takes a value smaller than 1 when a branched structure is present. The definition is described, for example, in "Developments in Polymer Characterization-4" (J.V. Dawkins, ed., Applied Science Publishers, 1983), and is a guideline known to those skilled in the art. Other references that can be used include Polymer, 45, 6495-6505 (2004), Macromolecules, 33, 2424-2436 (2000), and Macromolecules, 33, 6945-6952 (2000).

[0040] The polypropylene resin (X) used in the present invention may have a molecular structure in which, for example, comb chains are formed. Therefore, the following description will be given of a representative example in which the polypropylene resin (X) has a molecular structure in which comb chains are formed. By setting the g' of the polypropylene resin (X) within this range, it is possible to set the melt tension within an appropriate range, so that the propylene resin composition of the present invention maintains appropriate fluidity and exhibits good moldability, and the resulting injection-molded article can be thin yet maintains good strength and suppresses the occurrence of sink marks. That is, if the g' is less than 0.30, the proportion of main chains is small and the proportion of side chains is extremely high. In such cases, the melt tension does not improve or gel formation may occur, which may affect various physical properties and may be undesirable for achieving the objective of the present invention of exhibiting good moldability, obtaining thin yet maintains good strength, and suppressing the occurrence of sink marks. On the other hand, if the g' is 1.00, this means that there is no branching, which may result in insufficient melt tension, which is unsuitable for the objective of the propylene resin composition of the present invention of exhibiting good moldability, obtaining thin yet maintains good strength, and suppressing the occurrence of sink marks.

[0041] The method for calculating g', for example, the method used in the Examples of this specification, is as follows. The GPC system used was a Waters Alliance GPCV2000 equipped with a differential refractometer (RI) and a viscosity detector (Viscometer). A multi-angle laser light scattering detector (MALLS) model, model DAWN-E from Wyatt Technology, was used as the light scattering detector. The detectors were connected in the following order: MALLS, RI, and Viscometer. The mobile phase solvent was 1,2,4-trichlorobenzene (containing 0.5 mg / mL of the antioxidant Irganox 1076 manufactured by BASF Japan). The flow rate was 1 mL / min, and two Tosoh GMHHR-H(S) HT columns were connected together. The temperatures of the columns, sample injection port, and detectors were 140°C. The sample concentration was 1 mg / mL, and the injection volume (sample loop volume) was 0.2175 mL. To calculate the absolute molecular weight (Mabs), 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 aforementioned literature. It should be noted that other equivalent devices, columns, etc. may also be used.

[0042] [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 polymer molecule has a branched structure, its radius of gyration becomes smaller than that of a linear polymer molecule of the same molecular weight. As the radius of gyration becomes smaller, the intrinsic viscosity also becomes smaller. Therefore, as the branched structure becomes larger, the ratio ([η]br / [η]lin) of the intrinsic viscosity of a branched polymer to the intrinsic viscosity ([η]lin) of a linear polymer of the same molecular weight becomes smaller. Therefore, when the branching index (g' = [η]br / [η]lin) is a value smaller than 1, it means that branching is present. Here, a commercially available homopolypropylene (Novatec PP (registered trademark) manufactured by Japan Polypropylene Corporation, grade name: FY6) is used as the linear polymer for obtaining [η]lin. It is known by the Mark-Houwink-Sakurada equation that the logarithm of [η]lin of a linear polymer has a linear relationship with the logarithm of the molecular weight, 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. As an additional feature of the polypropylene resin (X) used in the present invention, it is preferable that the polypropylene resin (X) has the following properties regarding the mm fraction (mm) of propylene unit triads.

[0043] (1-6) mm fraction of propylene unit triads (mm) The polypropylene resin (X) used in the present invention preferably has high stereoregularity. The degree of stereoregularity is as follows:13 can be evaluated by C-NMR, 13 Preferably, the mm fraction (mm) of propylene unit triads obtained by C-NMR (hereinafter sometimes abbreviated as (mm fraction)) has a stereoregularity of 95% or more. The mm fraction is the percentage of propylene unit triads in which the methyl branches in each propylene unit are in the same direction among any propylene unit triads consisting of head-to-tail bonds in the polymer chain, with an upper limit of 100%. This mm fraction is a value indicating that the stereostructure of methyl groups in the polypropylene molecular chain is isotactically controlled; a higher mm fraction indicates a higher degree of control. By setting the mm fraction within the range shown below, the rigidity of the propylene resin composition of the present invention and the injection-molded article made thereof can be increased. In particular, when the injection-molded article is a cup-shaped package having a body and a flange, it is possible to maintain a good cup shape having a body and a flange despite its thin wall. That is, if the mm fraction is smaller than the value shown below, the mechanical properties of the propylene resin composition of the present invention and the injection-molded article made thereof, such as the rigidity, tend to be reduced. Therefore, the mm fraction is preferably 95% or more, more preferably 96% or more, and even more preferably 97% or more, with the upper limit being 100% as described above.

[0044] In addition, 13 The details of the method for measuring the mm fraction (mm) of propylene unit triads by C-NMR are as follows. 375 mg of sample was completely dissolved in 2.5 ml of deuterated 1,1,2,2-tetrachloroethane in an NMR sample tube (10 mm diameter), and then measured at 125°C using the proton complete decoupling method. The chemical shift was determined by setting the center peak of the three peaks of deuterated 1,1,2,2-tetrachloroethane at 74.2 ppm. The chemical shifts of the other carbon peaks were determined based on this peak. Flip angle: 90 degrees Pulse interval: 10 seconds Resonance frequency: 100MHz or more Accumulation count: 10,000 times or more Observation range: -20 ppm to 179 ppm Number of data points: 32768 The analysis of mm fraction was measured under the above conditions. 13 This is done using C-NMR spectroscopy. Spectral assignments are made with reference to Macromolecules, Vol. 8, p. 687 (1975) and Polymer, Vol. 30, p. 1350 (1989). A more specific method for determining the mm fraction is described in detail in paragraphs

[0053] to

[0065] of Japanese Patent Application Laid-Open No. 2009-275207, and this method is also used in the present invention.

[0045] (1-7) Manufacturing method The polypropylene resin (X) is not particularly limited in its production method as long as it satisfies the various properties described above, but as described above, a preferred production method for satisfying all of the conditions of high stereoregularity, a low content of low-crystalline components, and a preferred range of molecular weight distribution, as well as the conditions of a branching index g' in the range and high melt tension, is a method using a macromer copolymerization method utilizing a combination of metallocene catalysts. Examples of such methods include the method disclosed in JP-A-2009-57542. This method is a method for producing polypropylene having a branched structure using a catalyst that combines a catalyst component with a specific structure capable of producing a macromer and a catalyst component with a specific structure capable of copolymerizing a macromer to a high molecular weight. This method makes it possible to produce polypropylene resin (X) 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, using hydrogen as a molecular weight modifier.

[0046] Furthermore, in the past, it was necessary to increase the branching efficiency by reducing the crystallinity using a polypropylene component with low stereoregularity, but the above-mentioned method makes it possible to introduce a polypropylene component with sufficiently high stereoregularity into the side chain in a simple manner. The adoption of such a production method is preferred for the polypropylene resin (X) used in the present invention. Furthermore, by using the above method, it is possible to simultaneously satisfy various characteristics relating to molecular weight distribution by using two types of catalysts having significantly different polymerization characteristics, which is preferable.

[0047] (2) Propylene-based random copolymer (Y) The propylene random copolymer (Y) of the present invention satisfies the following (Yi): (Yi) The melt flow rate (MFR) is 40 to 150 g / 10 min.

[0048] As an additional feature of the propylene random copolymer (Y) used in the present invention, it is preferable that the propylene random copolymer (Y) is a random copolymer of propylene and ethylene and has the following characteristics regarding the total ethylene content: The total ethylene content is 0.5-5% by weight.

[0049] (2-1) Melt flow rate (MFR) The melt flow rate (MFR) of the propylene random copolymer (Y) used in the present invention must be in the range of 40 to 150 g / 10 min, preferably 50 to 140 g / 10 min, further preferably 60 to 130 g / 10 min, even more preferably 70 to 120 g / 10 min, and particularly preferably 75 to 110 g / 10 min. By setting the melt flow rate in this range, it is possible to exert an effect of reducing the load on the mold when molding a package, particularly a cup-shaped package having a body and a flange, and obtaining a cup-shaped package having a body and a flange that is thin but is less susceptible to sink marks or deformation in the flange.

[0050] As an additional feature of the propylene-based random copolymer (Y) used in the present invention, the propylene-based random copolymer (Y) is a random copolymer of propylene and ethylene, and preferably has the following properties regarding the total ethylene content: Furthermore, the propylene-based random copolymer (Y) preferably further has the following properties regarding the flexural modulus and Charpy impact strength at 23°C.

[0051] (2-2) Total ethylene content The propylene random copolymer (Y) used in the present invention is a random copolymer of propylene and, preferably, ethylene. The total ethylene content of the propylene random copolymer (Y) used in the present invention is preferably in the range of 0.5 to 5% by weight, more preferably 1 to 4.5% by weight. By adjusting the total ethylene content of the propylene random copolymer (Y) to fall within this range, the propylene resin composition of the present invention can have good mechanical properties, including impact resistance.

[0052] (2-3) Flexural modulus The flexural modulus of the propylene random copolymer (Y) is preferably 1,000 to 1,500 MPa, more preferably 1,050 to 1,450 MPa, and even more preferably 1,100 to 1,400 MPa. By setting the flexural modulus within this range, it is possible to obtain a thin-walled, cup-shaped package having a body and a flange that is resistant to deformation and has sufficient strength, particularly in the molding of a package, particularly a cup-shaped package having a body and a flange.

[0053] (2-4) Charpy impact strength at 23°C The Charpy impact strength of the propylene random copolymer (Y) at 23°C is preferably 2.0 to 7.0 kJ / m 2 and more preferably 2.5 to 6.5 kJ / m 2 , more preferably 3.0 to 6.0 kJ / m 2 By setting the Charpy impact strength within this range, it is possible to obtain an effect that, in molding a package, particularly a cup-shaped package having a body and a flange, the package is less likely to break and has sufficient strength and has a body and a flange.

[0054] (2-5) Manufacturing method The method for producing the propylene random copolymer (Y) used in the present disclosure is not particularly limited, and it can be produced, for example, by a conventionally known production method. In order to obtain the properties of the propylene random copolymer (Y) used in the present invention, a polymerization method using a stereoregular catalyst is preferred. Examples of the stereoregular catalyst include Ziegler catalysts and metallocene catalysts.

[0055] (2-5-1) Catalyst Examples of Ziegler catalysts include two-component catalysts consisting of a transition metal component, such as a titanium halide compound such as titanium trichloride, titanium tetrachloride, or trichloroethoxytitanium, or a contact product of the titanium halide compound with a magnesium compound, typically a magnesium halide, and an organometallic component, such as an alkylaluminum compound or its halide, hydride, or alkoxide, and further three-component catalysts in which an electron-donating compound containing nitrogen, carbon, phosphorus, sulfur, oxygen, silicon, or the like is added to any of the above components.

[0056] The metallocene catalyst is preferably a supported type. A particularly preferred example of the supported metallocene catalyst is an ion-exchanged layered silicate in which the support also functions as a co-catalyst, which is obtained by combining the following components [A], [B], and, if necessary, the component [C].

[0057] Component [A] Metallocene complex Transition metal compounds of groups 4-6 of the periodic table containing at least one conjugated five-membered ring ligand ·Component [B] Promoter Ion-exchange layered silicate Component [C] Organoaluminum compound

[0058] Component [A] Metallocene complex Specifically, the compound represented by the following formula [I] can be used as the component [A]. Q(C5H 4-a R1 a )(C5H 4-b R2 b)MXY ···[I] In formula [I], Q represents a linking group that bridges two conjugated five-membered ring ligands. M represents a transition metal of Groups 4 to 6 of the periodic table, and among these, titanium, zirconium and hafnium are preferred. X and Y each independently represent hydrogen, halogen, a hydrocarbon group having 1 to 20 carbon atoms, an oxygen-containing hydrocarbon group having 1 to 20 carbon atoms, a nitrogen-containing hydrocarbon group having 1 to 20 carbon atoms, a phosphorus-containing hydrocarbon group having 1 to 20 carbon atoms, or a silicon-containing hydrocarbon group having 1 to 20 carbon atoms.

[0059] R1 and R2 each independently represent a hydrocarbon group having 1 to 20 carbon atoms, a halogen, a halogen-containing hydrocarbon group having 1 to 20 carbon atoms, an alkoxy group, an aryloxy group, a silicon-containing hydrocarbon group, a phosphorus-containing hydrocarbon group, a nitrogen-containing hydrocarbon group, or a boron-containing hydrocarbon group. Two adjacent R1s or two adjacent R2s may be bonded to form a C4 to C10 ring. In particular, it is preferable that they form a 6-membered ring or a 7-membered ring, which, together with the above-mentioned conjugated five-membered ring, form an indene ring or an azulene ring. a and b are integers satisfying 0≦a≦4 and 0≦b≦4. Examples of the bonding group Q that bridges two conjugated five-membered ring ligands include an alkylene group, an alkylidene group, a silylene group, and a germylene group. These may have hydrogen atoms substituted with alkyl groups, halogens, etc. A silylene group is particularly preferred.

[0060] Specific preferred examples of the metallocene complex include the following compounds: (1) Methylenebis(cyclopentadienyl)zirconium dichloride (2) Methylene(cyclopentadienyl)(3,4-dimethylcyclopentadienyl)zirconium dichloride (3) Isopropylidene(cyclopentadienyl)(3,4-dimethylcyclopentadienyl)zirconium dichloride (4) Ethylene(cyclopentadienyl)(3,5-dimethylpentadienyl)zirconium dichloride (5) Methylenebis(indenyl)zirconium dichloride (6) Ethylenebis(2-methylindenyl)zirconium dichloride (7) Ethylene 1,2-bis(4-phenylindenyl)zirconium dichloride (8) Ethylene(cyclopentadienyl)(fluorenyl)zirconium dichloride

[0061] (9) Dimethylsilylene(cyclopentadienyl)(tetramethylcyclopentadienyl)zirconium dichloride (10) Dimethylsilylenebis(indenyl)zirconium dichloride (11) Dimethylsilylenebis(4,5,6,7-tetrahydroindenyl)zirconium dichloride (12) Dimethylsilylene(cyclopentadienyl)(fluorenyl)zirconium dichloride (13) Dimethylsilylene(cyclopentadienyl)(octahydrofluorenyl)zirconium dichloride (14) Methylphenylsilylenebis[1-(2-methyl-4,5-benzo(indenyl)]zirconium dichloride (15) Dimethylsilylenebis[1-(2-methyl-4,5-benzoindenyl)]zirconium dichloride (16) Dimethylsilylenebis[1-(2-methyl-4H-azulenyl)]zirconium dichloride (17) dimethylsilylenebis[1-(2-methyl-4-(4-chlorophenyl)-4H -azulenyl)]zirconium dichloride (18) Dimethylsilylenebis[1-(2-ethyl-4-(4-chlorophenyl)-4H-azulenyl)]zirconium dichloride (19) Dimethylsilylenebis[1-(2-ethyl-4-naphthyl-4H-azulenyl)]zirconium dichloride

[0062] (20) Diphenylsilylenebis[1-(2-methyl-4-(4-chlorophenyl)-4H-azulenyl)]zirconium dichloride (21) Dimethylsilylenebis[1-(2-methyl-4-(phenylindenyl))]zirconium dichloride (22) Dimethylsilylenebis[1-(2-ethyl-4-(phenylindenyl))]zirconium dichloride (23) Dimethylsilylenebis[1-(2-ethyl-4-naphthyl-4H-azulenyl)]zirconium dichloride (24) Dimethylgermylenebis(indenyl)zirconium dichloride (25) Dimethylgermylene(cyclopentadienyl)(fluorenyl)zirconium dichloride In addition, the same compounds as those mentioned above are also preferred as other Group 4, 5, and 6 transition metal compounds, such as titanium compounds and hafnium compounds. These compounds may be used in combination with the catalyst component and catalyst of the present disclosure.

[0063] Component [B] Co-catalyst (ion-exchange layered silicate) The ion-exchangeable layered silicate is not limited to a naturally occurring one, but may also be an artificially synthesized product. Clay compounds can be used as the ion-exchangeable layered silicate, and specific examples of clay compounds include the following layered silicates described in "Clay Mineralogy" by Haruo Shiramizu, Asakura Shoten (1995). (A) Kaolin group, such as dickite, nacrite, kaolinite, anoxite, metahalloysite, and halloysite, whose main constituent layers are 1:1 type structures; serpentine group, such as chrysotile, lisardite, and antigorite (a) Smectite group such as montmorillonite, sauconite, beidellite, nontronite, saponite, hectorite, stevensite, etc., vermiculite group such as vermiculite, mica group such as mica, illite, sericite, glauconite, attapulgite, sepiolite, palygorskite, bentonite, pyrophyllite, talc, chlorite group, which have a 2:1 type structure as their main constituent layer.

[0064] The silicate used in the present disclosure may be a layered silicate in which the mixed layers (a) and (b) above are formed. In the present disclosure, the silicate as the main component is preferably a silicate having a 2:1 type structure, more preferably a smectite group silicate, and particularly preferably montmorillonite.

[0065] The activity of these silicates can be improved by chemically treating them with an acid, a salt, an alkali, an oxidizing agent, a reducing agent, an organic solvent, or the like. The acid treatment removes impurities on the surface of the ion-exchange layered silicate particles, exchanges interlayer cations, and also dissolves some or all of the cations such as Al, Fe, and Mg in the crystal structure. The acid used in the acid treatment includes hydrochloric acid, nitric acid, sulfuric acid, etc., but inorganic acids are preferred, and sulfuric acid is particularly preferred. There are no particular restrictions on the conditions for the acid treatment, but the preferred conditions are a 5 to 50 wt % aqueous acid solution reacted at a temperature of 60 to 100°C for 1 to 24 hours, with the acid concentration being variable during this time. After the acid treatment, washing is usually carried out. Washing is an operation for separating and removing the acid contained in the treatment system from the ion-exchange layered silicate.

[0066] The salts used in the salt treatment are preferably selected to contain specific cations, preferably monovalent to tetravalent metal cations, and more preferably Li, Ni, Zn, or Hf cations. Specific examples of salts include the following: The cations with Li include LiCl, LiBr, Li2SO4, Li3(PO4), Li(ClO4), Li2(C2O4), LiNO3, Li(OOCCH3), Li 2(C4H4O4), etc. The cations with Ni include NiCO3, Ni(NO3)2, NiC2O4, and Ni (ClO4)2, NiSO4, NiCl2, NiBr2, etc. The cations with Zn include Zn(OOCH3)2, Zn(CH3COCHCOCH3)2, ZnCO3, Zn(NO3)2, Zn(ClO4)2, Zn3(PO4)2, Examples include ZnSO4, ZnF2, ZnCl2, ZnBr2, and ZnI2. The cations of Hf include Hf(OOCCH3)4, Hf(CO3)2, Hf(NO3)4, Hf(SO4)2, HfOCl2, HfF4, HfCl4, HfBr4, H Examples include fI4.

[0067] After the chemical treatment, drying is carried out. Generally, drying can be carried out at a temperature of 100 to 800°C, and high temperature conditions that cause structural destruction (for example, 800°C or higher, although this depends on the heating time) are not preferred. Even if the structure is not destroyed, the properties change depending on the drying temperature, so it is preferable to change the drying temperature depending on the application. The drying time is usually 1 minute to 24 hours, preferably 5 minutes to 4 hours, and the atmosphere is dry air, dry nitrogen, dry argon, or under reduced pressure. There are no particular limitations on the drying method, and various methods can be used.

[0068] Component [C] Organoaluminum compound The organoaluminum compound of component [C] is a component that is optionally used as needed, and is most preferably a compound represented by the following formula [II]: (AlR4 p X 3-p ) q [II] In formula [II], R4 represents a hydrocarbon group having 1 to 20 carbon atoms, X represents a halogen atom, a hydrogen atom, an alkoxy group, or an amino group, p represents an integer of 1 to 3, and q represents an integer of 1 to 2. R4 is preferably an alkyl group, and when X is an alkoxy group, it is preferably an alkoxy group having 1 to 8 carbon atoms, and when X is an amino group, it is preferably an amino group having 1 to 8 carbon atoms. Of these, preferred are trialkylaluminums where p = 3 and q = 1 and dialkylaluminum hydrides where p = 2 and q = 1. More preferred are trialkylaluminums where R4 has 1 to 8 carbon atoms.

[0069] The organoaluminum compounds can be used alone or in combination, and can be added not only during catalyst preparation but also during prepolymerization or main polymerization.

[0070] (2-5-2) Method for producing propylene-based random copolymer (Y) The method for producing the propylene random copolymer (Y) is not particularly limited, but a polymerization method using the stereoregular catalyst is preferred. Examples of the stereoregular catalyst include a Ziegler catalyst and a metallocene catalyst. The Ziegler propylene random copolymer (Y) can be produced by copolymerizing propylene and a comonomer such as ethylene using a Ziegler catalyst. The metallocene propylene random copolymer (Y) can be produced by copolymerizing propylene and a comonomer such as ethylene using a metallocene catalyst.

[0071] Examples of methods for producing the propylene-based random copolymer (Y) include a polymerization method such as a slurry polymerization method using an inert solvent in the presence of the catalyst, a solution polymerization method, a gas phase polymerization method using substantially no solvent, and a bulk polymerization method using a polymerization monomer as a solvent. For example, in the case of a slurry polymerization method, the polymerization can be carried out in an inert hydrocarbon such as n-butane, isobutane, n-pentane, isopentane, hexane, heptane, octane, cyclohexane, benzene, toluene, or xylene. In the case of a bulk polymerization method, the polymerization can be carried out in a liquid polymerization monomer. The polymerization temperature is usually -80 to 150°C, preferably 40 to 120°C. The polymerization pressure is preferably 1 to 60 atmospheres (0.10 to 6.08 MPa), and the molecular weight of the resulting propylene-based random copolymer (Y) can be adjusted with hydrogen or other known molecular weight modifiers. The polymerization can be carried out by a continuous or batch reaction under conditions commonly used. Furthermore, the polymerization reaction can be carried out in one stage or multiple stages. When a metallocene catalyst is used, it is desirable to carry out a prepolymerization treatment before the main polymerization. The monomers to be subjected to the prepolymerization may be α-olefins such as ethylene, propylene, 1-butene, and 1-hexene, diene compounds such as 1,3-butadiene, and vinyl compounds such as styrene and divinylbenzene. This prepolymerization is preferably carried out in an inert solvent under mild conditions, and is desirably carried out so that 0.01 to 1,000 g, preferably 0.1 to 100 g, of polymer is produced per 1 g of solid catalyst (total of component [A] and component [B]).

[0072] The polymerization reaction is carried out in the presence or absence of a solvent such as an inert hydrocarbon such as butane, pentane, hexane, heptane, toluene, or cyclohexane, or a liquefied α-olefin. In the present invention, it is desirable to maximize the amount of polymer produced per solid catalyst (if the solid catalyst has been prepolymerized, this does not include the polymer produced by the prepolymerization). In order to increase the amount of polymer produced, it is desirable to set both the polymerization temperature and polymerization pressure relatively high.

[0073] Typically, the polymerization temperature is selected from 60 to 90°C, and the polymerization pressure is selected from about 1.5 to 4 MPa. In particular, in the case of bulk polymerization, the polymerization temperature is preferably 60 to 80°C, and the polymerization pressure is preferably selected from about 2.5 to 4 MPa in correlation with the temperature. On the other hand, in the case of gas-phase polymerization, the polymerization temperature is preferably 70 to 90°C, and the polymerization pressure is preferably selected from about 1.5 to 4 MPa. Furthermore, the polymer production amount per solid catalyst can be increased by increasing the residence time of the solid catalyst, but if it is too long, productivity will be affected. The preferred residence time is 1 to 8 hours, more preferably 1 to 6 hours. It is desirable to set the polymerization conditions so that the polymer production amount per 1 g of solid catalyst including the carrier is 20 kg or more, preferably 25 kg or more, more preferably 30 kg or more. Hydrogen may be present in the polymerization system as a molecular weight modifier. Furthermore, the polymerization may be carried out in multiple stages by changing the polymerization temperature, the concentration of the molecular weight modifier, etc.

[0074] Such propylene-based random copolymers (Y) are commercially available in various forms from various companies, such as the Novatec series manufactured by Japan Polypropylene Corporation, and a desired product may be selected from these and used as the propylene-based random copolymer (Y).

[0075] (3) Propylene resin composition In the propylene resin composition of the present invention, the polypropylene resin (X) is preferably 10 to 50% by weight and the propylene random copolymer (Y) is 50 to 90% by weight (provided that the total of the polypropylene resin (X) and the propylene random copolymer (Y) is 100% by weight). More preferably, the polypropylene resin (X) is 15 to 45% by weight and the propylene random copolymer (Y) is 55 to 85% by weight, and even more preferably, the polypropylene resin (X) is 20 to 40% by weight and the propylene random copolymer (Y) is 60 to 80% by weight. By setting the propylene resin composition of the present invention within these composition ranges, it becomes easier to effectively obtain the effects of the present invention.

[0076] (4) Other additives The propylene resin composition of the present disclosure may contain various additives, such as a heat stabilizer, an antioxidant, a weather stabilizer, an ultraviolet absorber, a copper inhibitor, an antistatic agent, a flame retardant, a hydrophilizing agent, a slip agent, an antiblocking agent, an antifogging agent, a colorant, a filler, polyethylene, an elastomer, a petroleum resin, and an antibacterial agent, as long as the effects of the present invention are not impaired. If MFR adjustment is required, organic peroxides can also be added.

[0077] (5) Method for preparing propylene resin composition Examples of methods for producing the polypropylene resin composition according to the present disclosure include a method of mixing the polypropylene resin (X) and the propylene-based random copolymer (Y), optionally further adding any of the other additive components, and dry blending the mixture by sprinkling or hand blending; a method of mixing the mixture using various blenders, mixers, etc., such as a V-blender or a tumbler mixer; a method of melting, kneading, and granulating the mixture using a conventional kneader, such as a single-screw extruder, a twin-screw extruder, a Banbury mixer, a roll mixer, a Brabender plastograph, or a kneader; and a method of directly feeding the components separately (or partially blended) as they are into various molding machines, such as an injection molding machine.

[0078] When the melting, kneading, and granulation method is selected, it is usually preferable to use a twin-screw extruder for melting, kneading, and granulation. During this melting, kneading, and granulation, the blend of the polypropylene resin (X) and the propylene random copolymer (Y) (and optionally the above-mentioned optional other additive components) may be melted, kneaded, and granulated simultaneously, or, to improve performance, each component may be divided; for example, first, a portion of the polypropylene resin (X) and the propylene random copolymer (Y) may be melted, kneaded, and granulated, and then the remaining components may be melted, kneaded, and granulated. The melt-kneading temperature during granulation is preferably 150 to 300°C, more preferably 180 to 250°C.

[0079] (6) Injection molded body The injection-molded body of the present invention, particularly the cup-shaped packaging body having a body and a flange, is prevented from deformation of the body or flange and from sinking in the flange. Therefore, by placing food inside the cup-shaped packaging body having a body and a flange of the present disclosure and fusing the flange portion to the film, the food can be sealed inside the cup-shaped packaging body having a body and a flange, and a food product can be created with the food sealed inside.

[0080] The thickness of the body of the cup-shaped packaging having a body and a flange is preferably 0.3 to 0.7 mm, more preferably 0.35 to 0.6 mm, and even more preferably 0.4 to 0.5 mm. By setting the thickness of the body of the cup-shaped packaging having a body and a flange within this range, the amount of resin required for manufacturing the cup-shaped packaging having a body and a flange can be reduced, and deformation of the body can be prevented even though the cup-shaped packaging having a body and a flange is thin and lightweight. The thickness of the flange of a cup-shaped packaging body having a body and a flange is preferably 1.2 to 5 times the thickness of the body, more preferably 1.5 to 4.5 times, and particularly preferably 1.7 to 4 times. By setting the thickness of the flange of a cup-shaped packaging body having a body and a flange within this range, it is possible to prevent deformation of the cup-shaped packaging body having a body and a flange and to make it easy to open, despite the fact that the cup-shaped molding having a body and a flange is thin and lightweight. The thickness of the flange is preferably 0.5 to 3.5 mm, more preferably 0.6 to 2.5 mm, and particularly preferably 0.7 to 1.5 mm. By setting the thickness of the flange within this range, it is possible to prevent deformation of the cup-shaped package having a body and a flange and to make it easy to open, despite the fact that the cup-shaped molded product is thin and lightweight and has a body and a flange.

[0081] For the sake of productivity of the injection molded article of the present invention, it is preferable to use a multi-cavity mold that can mold a plurality of products simultaneously.

[0082] (7) Food Food products can be produced by placing food in the cup-shaped packaging of the present invention having a body and a flange, and sealing the food by welding the flange with a film. By sealing the food, the food product can be distributed while maintaining its quality. Examples of foods include pudding, cheese, jelly, yogurt, agar, Spam, dried fish, etc. The term "food product" as used herein refers to a package, the food contained in the package, and the film heat-sealed to the flange of the package to seal the food. [Example]

[0083] The description of the examples specifically explains the present disclosure, but the present disclosure is not limited by the examples.

[0084] (1) Evaluation method of physical properties (1-1) Melt flow rate (MFR) The MFR was measured under a load of 2.16 kg at 230°C in accordance with JIS K-7210-1999.

[0085] (1-2) Flange sink marks In the visual evaluation, a package with a sink mark on the flange was evaluated as "×", and a package with no sink mark on the flange was evaluated as "○". In Table 1, the visual evaluation is indicated as "visual".

[0086] (1-3) Transparency The haze value of the center portion of the body cut out from a cup-shaped package having a body and a flange was determined in accordance with JIS K7136 (ISO179).

[0087] (1-4) Branching index (g') [η]br and [η]lin were calculated under the above conditions to obtain g'.

[0088] (1-5) Molecular weight distribution (Mw / Mn) and molecular weight distribution (Mz / Mw) by GPC Measurement data by GPC was obtained under the above-mentioned conditions, and the molecular weight distribution (Mw / Mn) and molecular weight distribution (Mz / Mw) by GPC were obtained.

[0089] (1-6) Total ethylene content The total ethylene content was obtained by the following measurement and analysis. The FT-IR measurement was carried out under the following conditions, and the data was collected. Device: PerkinElmer 1760X (A) Detector: MCT (a) Resolution: 8cm -1 (c) Measurement interval: 0.2 minutes (12 seconds) (D) Number of measurements per measurement: 15 Post-processing and analysis of measurement results 2956 cm obtained by FT-IR -1 and absorbance at 2927cm -1 The ratio of the absorbance of polyethylene, polypropylene, 13 The total ethylene content (wt%) was calculated using a calibration curve prepared in advance using ethylene-propylene-rubber (EPR) and its mixtures, whose ethylene content was known by C-NMR measurement or other methods.

[0090] (1-7) Melt tension (MT) The melt tension (MT) was obtained under the above conditions.

[0091] (1-8) Paraxylene solubles (CXS) The amount of paraxylene solubles (CXS) was obtained under the above conditions.

[0092] (1-9) mm fraction of propylene unit triads (mm) The mm fraction (mm) of propylene unit triads was obtained under the above conditions.

[0093] (1-10) Flexural modulus The value was calculated in accordance with JIS K7171 (ISO178).

[0094] (1-11) Weight Eight cup-shaped packages each having a body and a flange were stacked on top of each other, and the weight of the packages was measured using a precision balance. The measured value was then divided by 8 to determine the weight per cup-shaped package having a body and a flange. The unit of package weight is g. In Table 1, the weight of the package is indicated as "weight."

[0095] (1-12) Thickness of flange and body The thicknesses of the flange and body of the cup-shaped package having a body and a flange obtained by injection molding were measured using a micrometer or vernier calipers.

[0096] (2) Materials used (2-1) Polypropylene resin (X) In this example, "X-1" used was a product name WAYMAX MFX3 manufactured by Japan Polypropylene Corp. X-1 is a polypropylene resin. It was confirmed that X-1 had an MFR of 8 g / 10 min, an Mw / Mn of 4.3, an Mz / Mw of 4.5, an MT of 9.2 gf, a CXS of 0.1 wt%, an mm of 98, a relationship of Log(MT)≧−0.9×log(MFR)+0.7, and a g′ of 0.87.

[0097] (2-2) Propylene-based block copolymer (Y) In this example, "Y-1" was a product manufactured by Japan Polypropylene Corporation under the trade name "Novatec PP MG05ES." Y-1 is a propylene-based random copolymer polymerized using a Ziegler catalyst. Y-1 contains 4% by weight of ethylene. The MFR of Y-1 is 45 g / 10 min, and the flexural modulus of Y-1 is 1,000 MPa.

[0098] In this example, "Y-2" was a product manufactured by Japan Polypropylene Corporation under the trade name "Novatec PP BC08F." Y-2 is a propylene-ethylene block copolymer polymerized using a Ziegler catalyst. Y-2 contains 20% by weight of the propylene-ethylene copolymer. Y-2 contains 40% by weight of ethylene (total ethylene content is 8% by weight). The MFR of Y-2 is 75 g / 10 min. The flexural modulus of Y-2 is 1400 MPa.

[0099] (3) Injection molding [Examples 1-2 and Comparative Examples 1-3] A mixture of X-1, Y-1, and Y-2 in the weight parts shown in Table 1 was placed in an injection molding machine SG125M-H manufactured by Sumitomo Heavy Industries, and a cup-shaped package having a body and a flange as shown in Figures 1 to 3 was injection molded while taking care to prevent short shots. The cup-shaped package has a body and a flange, the flange has an inner diameter of 80 mm, the bottom has an inner diameter of 58 mm, the foot has an inner diameter of 56 mm, the height is 50 mm, the foot has a height of 5 mm, the bottom has a thickness of 0.7 mm, the body has a thickness of 0.4 mm, and the flange has a thickness of 0.6 mm. The internal volume of the package is 180 ml.

[0100] Table 1 shows the evaluation results of the packages of Examples 1 and 2 and Comparative Examples 1 to 3.

[0101] [Table 1]

[0102] From Table 1, it can be seen that the problem of this disclosure is solved. [Explanation of symbols]

[0103] 1 flange 2. Torso 3 bottom 4 Foot 5 Flange thickness 6 Inner diameter of foot 7. Foot Height 8. Height of package 9 Inner diameter of opening 10 Body thickness 11 Bottom inner diameter 12 Bottom thickness

Claims

1. A propylene resin composition comprising a polypropylene resin (X) that satisfies the following (X-i) to (X-vii) and a propylene-based random copolymer (Y) that satisfies the following (Y-i): (Xi) The melt flow rate (MFR) is 0.1 to 35 g / 10 min. (X-ii) The molecular weight distribution (Mw / Mn) determined by gel permeation chromatography (GPC) is 3.0 to 10. (X-iii) The melt tension (MT) is 5 to 50 gf. (X-iv) The content of paraxylene soluble components (CXS) is 0.01% by weight or more and less than 5% by weight. (Xv) The molecular weight distribution (Mz / Mw) is 3.0 to 10. (X-vi) Melt tension (MT) is Log(MT)≧-0.9×log(MFR)+0.7 Or, MT≧15 is satisfied. (X-vii) The branching index (g') is 0.3 to 1. (Yi) The melt flow rate (MFR) is 40 to 150 g / 10 min.

2. 2. The propylene resin composition according to claim 1, wherein the polypropylene resin (X) is 10 to 50% by weight and the propylene-based random copolymer (Y) is 50 to 90% by weight (provided that the total of the polypropylene resin (X) and the propylene-based random copolymer (Y) is 100% by weight).

3. 2. The propylene resin composition according to claim 1, wherein the propylene random copolymer (Y) is a random copolymer of propylene and ethylene, and the total ethylene content thereof is 0.5 to 5% by weight.

4. 2. The propylene resin composition according to claim 1, wherein the mm fraction (mm) of propylene unit triads in the polypropylene resin (X) is 95% or more.

5. An injection-molded article made of the propylene resin composition according to any one of claims 1 to 4.

6. 6. The injection-molded article according to claim 5, which is a cup-shaped package having a body and a flange.

7. 7. The cup-shaped package according to claim 6, wherein the thickness of the body is 0.3 to 0.7 mm, and the thickness of the flange is 1.2 to 5 times the thickness of the body.

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