Recycled resin raw material-containing polypropylene film and laminate

Abstract

[Problem] To provide: a recycled resin raw material-containing polypropylene film capable of achieving film performance comparable to conventional films by using a recycled resin raw material containing an ethylene-vinyl alcohol resin; and a laminate. [Solution] A polypropylene film comprising, as a constituent material, a recycled resin raw material containing an ethylene-vinyl alcohol resin and a polyolefin resin. The polypropylene film has an IR intensity ratio (POH / PCH3), which is the ratio of the peak height (POH) derived from an OH group to the peak height (PCH3) derived from a CH3 group found in an absorbance spectrum measured by FT-IR transmission spectroscopy, of less than 3.0.

Description

Polypropylene film and laminate containing recycled resin raw materials

[0001] The present invention relates to a polypropylene film, and more particularly to a polypropylene film containing recycled resin raw materials including an ethylene vinyl alcohol resin and a polyolefin resin, and a laminate containing the polypropylene film.

[0002] In general, polypropylene films are suitable for use as packaging materials for packaging products such as food and daily necessities due to their excellent heat resistance, chemical resistance, and heat sealing properties. For this type of packaging material, there is a strong demand for high quality, for example, when packaging food. Therefore, a laminate in which multiple types of resin films with various functions are laminated on a polypropylene film is preferably used as a packaging material.

[0003] Foods packaged in packaging materials have a food waste problem, for example, whereby the appearance and flavor of the food deteriorate over time due to oxidation, drying, etc., and the food is discarded after its best-before date or use-by date has passed. In recent years, due to growing interest in environmental issues, there has been a trend to reduce food waste by using food packaging materials with barrier properties that suppress the transmission of oxygen, water vapor, etc., thereby suppressing oxidation, drying, etc. of the contents and enabling them to maintain freshness for a long period of time. As a packaging material used in this case, for example, a laminate film provided with a barrier layer containing ethylene vinyl alcohol copolymer (EVOH) is known (see Patent Document 1).

[0004] Furthermore, one of the environmentally friendly efforts in the field of resin films is the recycling of waste materials generated during the manufacturing process before products are released to the market, such as scrap materials such as offcuts generated during production and surplus products. When recycling film waste, it is effective from the perspective of resource circulation to use it as recycled raw materials for part of the constituent materials of resin films.

[0005] Therefore, the inventors have considered recycling the above-mentioned EVOH-containing film waste materials as a constituent material for general-purpose resin films. However, because EVOH is incompatible with polypropylene resins, which are often used as the main raw material for resin films, when recycled EVOH-containing film materials are blended as a constituent material for resin films, problems have arisen in that the film performance, mainly the stretchability of the resulting film, is likely to deteriorate. Thus, it has been difficult to recycle EVOH-containing films as a constituent material for resin films, but it is desirable to realize resource circulation for this type of film as well.

[0006] Japanese Patent Application Laid-Open No. 2015-221507

[0007] The present invention has been proposed in view of the above points, and provides a polypropylene film and laminate containing recycled resin raw materials that can obtain film performance comparable to that of conventional films using recycled resin raw materials containing ethylene vinyl alcohol-based resins.

[0008] That is, the first invention is a polypropylene film containing recycled resin raw materials including an ethylene vinyl alcohol-based resin and a polyolefin-based resin as constituent materials, and the polypropylene film has a peak height (P ＯＨ ) and CH ３ The peak height (P ＣＨ３ IR intensity ratio (P ＯＨ / P ＣＨ３ ) is less than 3.0.

[0009] The second invention relates to a polypropylene film containing recycled resin raw materials, in which the ethylene-vinyl alcohol-based resin and the polyolefin-based resin in the polypropylene film are present in a sea-island phase-separated structure in which the polyolefin-based resin forms a sea portion and the ethylene-vinyl alcohol-based resin forms islands.

[0010] A third invention relates to a recycled resin raw material-containing polypropylene film according to the first invention, wherein the constituent material of the polypropylene film contains the recycled resin raw material and a polypropylene-based resin.

[0011] A fourth invention relates to a polypropylene film containing recycled resin raw materials, in which the ethylene-vinyl alcohol-based resin, the polyolefin-based resin, and the polypropylene-based resin in the polypropylene film are present in a sea-island phase-separated structure in which the polyolefin-based resin and the polypropylene-based resin form a sea portion and the ethylene-vinyl alcohol-based resin forms islands.

[0012] The fifth invention relates to a polypropylene film containing recycled resin raw materials according to the second or fourth invention, wherein the maximum particle size of the granular island portions made of the ethylene-vinyl alcohol-based resin present on the cross section of the polypropylene film when cut perpendicular to the molding flow direction is 10 μm or less.

[0013] A sixth invention relates to the polypropylene film containing recycled resin raw materials according to the first or second invention, wherein the polypropylene film is an unstretched polypropylene film, and the unstretched polypropylene film has a tensile strength in the transverse direction (TD) of 20 MPa or more and a tensile elongation of 300% or more, as measured in accordance with JIS K 7127 (1999).

[0014] A seventh invention relates to the polypropylene film containing recycled resin raw materials according to the third or fourth invention, wherein the polypropylene film is made of an unstretched polypropylene film, and the unstretched polypropylene film has a tensile strength in the transverse direction (TD) of 20 MPa or more and a tensile elongation of 300% or more, as measured in accordance with JIS K 7127 (1999).

[0015] The eighth invention relates to the polypropylene film containing recycled resin raw materials according to the first or second invention, wherein the polypropylene film is a stretched polypropylene film stretched at least in the width (TD) direction, and the stretched polypropylene film has a tensile strength in the width (TD) direction of 150 MPa or more and an elastic modulus of 1.5 GPa or more in accordance with JIS K 7127 (1999).

[0016] A ninth invention relates to the polypropylene film containing recycled resin raw materials according to the third or fourth invention, wherein the polypropylene film is a stretched polypropylene film stretched at least in the width (TD) direction, and the stretched polypropylene film has a tensile strength in the width (TD) direction of 150 MPa or more and an elastic modulus of 1.5 GPa or more in accordance with JIS K 7127 (1999).

[0017] A tenth aspect of the present invention relates to a polypropylene film containing recycled resin materials, in which the polypropylene-based resin contains recycled materials.

[0018] An eleventh invention relates to the recycled resin raw material-containing polypropylene film according to the third invention, wherein the polypropylene-based resin contains a biomass raw material.

[0019] A twelfth aspect of the present invention relates to a laminate comprising the polypropylene film containing recycled resin raw materials according to the sixth aspect of the present invention.

[0020] A thirteenth aspect of the present invention relates to a laminate comprising the polypropylene film containing recycled resin raw materials according to the seventh aspect of the present invention.

[0021] A fourteenth aspect of the present invention relates to a laminate comprising the polypropylene film containing recycled resin raw materials according to the eighth aspect of the present invention.

[0022] A fifteenth aspect of the present invention relates to a laminate comprising the polypropylene film containing recycled resin raw materials according to the ninth aspect of the present invention.

[0023] According to the first aspect of the present invention, the polypropylene film containing recycled resin raw materials is a polypropylene film containing recycled resin raw materials including an ethylene vinyl alcohol-based resin and a polyolefin-based resin as constituent materials, and the polypropylene film has a peak height (P ＯＨ ) and CH ３ The peak height (P ＣＨ３ IR intensity ratio (P ＯＨ / P ＣＨ３ ) is less than 3.0, the influence of the ethylene vinyl alcohol resin on the film performance is suppressed, and film performance comparable to that of conventional films can be obtained.

[0024] According to the second invention, the polypropylene film containing recycled resin raw materials is different from the first invention in that the ethylene-vinyl alcohol-based resin and the polyolefin-based resin in the polypropylene film have a sea-island phase-separated structure in which the polyolefin-based resin forms a sea portion and the ethylene-vinyl alcohol-based resin forms islands. This makes it possible to further suppress the impact of EVOH on the film performance.

[0025] According to the third invention of the polypropylene film containing recycled resin raw materials, in the first invention, the constituent materials of the polypropylene film contain the recycled resin raw materials and polypropylene-based resin, making it easier to obtain film performance that is comparable to conventional films.

[0026] According to the fourth invention, the polypropylene film containing recycled resin raw materials is the same as in the third invention, in which the ethylene-vinyl alcohol-based resin, the polyolefin-based resin, and the polypropylene-based resin in the polypropylene film have a sea-island phase-separated structure in which the polyolefin-based resin and the polypropylene-based resin form a sea portion and the ethylene-vinyl alcohol-based resin forms islands. This makes it possible to further suppress the impact of EVOH on film performance.

[0027] According to the fifth invention of the polypropylene film containing recycled resin raw materials, in the second or fourth invention, when the polypropylene film is cut perpendicular to the molding flow direction, the maximum particle size of the granular island portions made of the ethylene-vinyl alcohol-based resin present on the cross section of the film has to be 10 μm or less, and therefore the stretchability of the polypropylene film in the transverse direction (TD) is good.

[0028] According to the sixth invention, the polypropylene film containing recycled resin raw materials is the same as the first or second invention, in which the polypropylene film is made of an unstretched polypropylene film, and the unstretched polypropylene film has a tensile strength in the transverse direction (TD) of 20 MPa or more and a tensile elongation of 300% or more in accordance with JIS K 7127 (1999), and therefore can be suitably used as a general-purpose sealant film, etc.

[0029] According to the seventh invention, the polypropylene film containing recycled resin raw materials is the third or fourth invention, in which the polypropylene film is made of an unstretched polypropylene film, and the unstretched polypropylene film has a tensile strength in the transverse direction (TD) of 20 MPa or more and a tensile elongation of 300% or more in accordance with JIS K 7127 (1999), and can therefore be suitably used as a general-purpose sealant film, etc.

[0030] According to the eighth invention, the polypropylene film containing recycled resin raw materials is the same as that of the first or second invention, in which the polypropylene film is a stretched polypropylene film stretched at least in the width (TD) direction, and the stretched polypropylene film has a tensile strength in the width (TD) direction in accordance with JIS K 7127 (1999) of 150 MPa or more and an elastic modulus of 1.5 GPa or more, and therefore can be suitably used as a general-purpose base film, etc.

[0031] According to the ninth invention, the polypropylene film containing recycled resin raw materials is the third or fourth invention, in which the polypropylene film is a stretched polypropylene film stretched at least in the width (TD) direction, and the stretched polypropylene film has a tensile strength in the width (TD) direction in accordance with JIS K 7127 (1999) of 150 MPa or more and an elastic modulus of 1.5 GPa or more, and therefore can be suitably used as a general-purpose base film, etc.

[0032] According to the polypropylene film containing recycled resin materials of the tenth invention, in the third invention, the polypropylene resin contains recycled materials, so that it can contribute to reducing environmental load by realizing resource circulation.

[0033] According to the eleventh invention of the polypropylene film containing recycled resin raw materials, in the third invention, the polypropylene resin contains biomass raw materials, so that carbon neutrality can be achieved, thereby contributing to reducing environmental load.

[0034] According to the laminate of the twelfth invention, since it contains the polypropylene film containing recycled resin raw materials as described in the sixth invention, it is possible to provide a laminate that contributes to reducing the environmental load.

[0035] According to the laminate of the thirteenth invention, since it contains the polypropylene film containing recycled resin raw materials as described in the seventh invention, it is possible to provide a laminate that contributes to reducing the environmental load.

[0036] According to the laminate of the fourteenth invention, since it contains the polypropylene film containing recycled resin raw materials as described in the eighth invention, it is possible to provide a laminate that contributes to reducing the environmental load.

[0037] According to the laminate of the fifteenth invention, since it contains the polypropylene film containing recycled resin raw materials as described in the ninth invention, it is possible to provide a laminate that contributes to reducing the environmental load.

[0038] 1 is an absorbance spectrum of a polypropylene film containing recycled resin raw materials according to one embodiment of the present invention, measured by an FT-IR transmission measurement method. ３ 1 is an enlarged view of a peak derived from a group. FIG. 2 is a schematic view of a cross section of a polypropylene film containing recycled resin raw materials, cut in a direction perpendicular to the molding flow direction.

[0039] The polypropylene film containing recycled resin raw materials of the present invention is a polypropylene film intended for the reuse of molded products containing ethylene-vinyl alcohol-based resins, and contains recycled resin raw materials containing ethylene-vinyl alcohol-based resins and polyolefin-based resins as constituent materials. This polypropylene film can be used as a general-purpose film, and is suitable for use, for example, as a packaging film for food products or as a base film for laminates in which multiple types of films are laminated.

[0040] Recycled resin raw materials are resin raw materials obtained by reusing resin molded products containing ethylene vinyl alcohol resin (EVOH). EVOH-containing molded products that can be used as recycled resin raw materials are molded products containing at least EVOH and polyolefin resin as constituent materials, and examples include scrap such as offcuts generated during the production of resin molded products such as films, materials generated in product manufacturing processes before they are released to the market, such as surplus products, and materials recovered and recycled from used products in the market, such as waste resin molded products. These materials derived from EVOH-containing molded products can be reused as recycled resin raw materials by undergoing recycling processes such as chemical recycling and material recycling.

[0041] Ethylene vinyl alcohol resin (EVOH) in recycled resin raw materials is a resin primarily contained for the purpose of imparting gas barrier properties to molded products. On the other hand, polyolefin resin in recycled resin raw materials is a resin primarily contained as the main raw material for molded products, such as polyethylene resin or polypropylene resin, which are suitable as the main raw materials for resin molded products. In addition to the main resin materials, such as EVOH or polyolefin resin, EVOH-containing molded products may contain other materials that are difficult to remove from the main resin materials, such as additives, such as antistatic agents and antiblocking agents, and resins used in masterbatches for these additives. Therefore, the inclusion of these other materials in recycled resin raw materials is acceptable.

[0042] The polypropylene-based resin in the recycled resin raw material is a known polypropylene-based resin, and examples thereof include propylene homopolymers, propylene-α-olefin random copolymers such as propylene-ethylene random copolymers and propylene-ethylene-butene random copolymers, and propylene-ethylene block copolymers. The polypropylene-based resins include resins produced from appropriate starting materials, such as those derived from petroleum feedstocks, biomass feedstocks, and recycled materials such as material recycling and chemical recycling. The polypropylene-based resin in the recycled resin raw material includes one or a mixture of two or more of the polypropylene-based resins listed above.

[0043] The polyethylene resin in the recycled resin raw material is a known polyethylene resin, and examples thereof include random copolymers with α-olefins such as propylene, 1-butene, 1-heptene, 1-hexene, and 1-octene. The polyethylene resin includes resins produced from appropriate starting materials, such as those derived from petroleum feedstocks, biomass feedstocks, and recycled materials obtained through material recycling and chemical recycling. The polyethylene resin in the recycled resin raw material includes one or a mixture of two or more of the polyethylene resins listed above.

[0044] The polypropylene film containing recycled resin materials of the present invention preferably further contains a polypropylene-based resin as a constituent material. Polypropylene-based resins are resins with excellent mechanical strength, heat resistance, and the like, and can be suitably used as a constituent material for films. The type of polypropylene resin can be any general polypropylene resin, and is selected from, for example, at least one of propylene homopolymers, propylene-α-olefin random copolymers such as propylene-ethylene random copolymers and propylene-ethylene-butene random copolymers, and propylene-ethylene block copolymers. It is particularly preferable that the polypropylene resin is primarily a propylene-α-olefin random copolymer. A mixture of one or more of the above polypropylene resins can also be used.

[0045] The starting material for this polypropylene-based resin is not particularly limited and can be appropriately selected from petroleum-derived materials, biomass-derived materials, recycled materials, etc. Among these starting materials, polypropylene-based resins derived from biomass-derived materials or recycled materials are preferred from the viewpoint of contributing to reducing environmental load.

[0046] Petroleum-derived polypropylene resins are obtained by thermally cracking naphtha, which is obtained by refining fossil fuels such as petroleum through distillation separation, and fractionating the resulting cracked components. Petroleum-derived polypropylene resins are widely used and easily available, and are available in a wide variety of types and are also advantageous in terms of price.

[0047] Biomass raw materials for polypropylene resins are oils derived from plants, such as soybean oil, sesame oil, rice bran oil, sunflower oil, cottonseed oil, corn oil, rapeseed oil, olive oil, perilla oil, and almond oil, as well as waste oils from these sources, crude tall oil, a by-product of kraft pulp production, and oils extracted from wood such as wood chips. Biomass-derived polypropylene resins are obtained from bionaphtha, which is obtained by distillation and separation of these plant-derived oils, or biopropane, a by-product of biodiesel fuel obtained by decomposing plant-derived oils using a catalyst. Biomass-derived polypropylene resins can contribute to reducing environmental impact by achieving carbon neutrality.

[0048] Recycled raw materials for polypropylene-based resins are materials obtained by reusing polypropylene resin molded products made primarily from polypropylene-based resins. Reusable polypropylene resin molded products include, for example, scrap materials such as offcuts generated during the production of resin molded products such as films, surplus products, and other materials generated during the product manufacturing process before they are released to the market, as well as recycled materials such as waste resin molded products collected from used products in the market. These materials derived from polypropylene molded products can be reused as recycled raw materials for polypropylene-based resins by undergoing recycling processes such as chemical recycling and material recycling. Polypropylene-based resins derived from recycled raw materials can contribute to reducing environmental impact by realizing resource circulation.

[0049] The polypropylene film of the present invention may contain known additives such as antioxidants, light stabilizers, lubricants, antiblocking agents, antistatic agents, and compatibilizers as appropriate, provided that the object of the invention is not impaired.

[0050] The thickness of the polypropylene film of the present invention is not particularly limited and may be appropriately determined depending on the demand, application, etc. For example, it is preferably about 5 to 250 μm, and more preferably about 10 to 100 μm.

[0051] The polypropylene film containing recycled resin raw materials of the present invention is formed by a known film forming method such as the T-die method. Furthermore, during forming, the film is formed into an unstretched polypropylene film or an oriented polypropylene film such as a uniaxially or biaxially stretched film depending on the intended use. The unstretched polypropylene film is a film that is not subjected to a stretching process, and the stretching is suppressed, reducing the orientation of the film, resulting in high heat seal strength. The unstretched polypropylene film also includes films that have been stretched due to unavoidable circumstances during film formation.

[0052] A uniaxially stretched polypropylene film is a film stretched in one direction, and has good unidirectional tearability (straight tearability, straight cutability). The film is stretched in either the machine direction (MD) (the molding flow direction) or the transverse direction (TD) (the width direction). The stretching ratio (roll-to-roll stretching, tenter stretching) is preferably 2 to 15 times, more preferably 3 to 10 times, and even more preferably 3 to 6 times.

[0053] Biaxially oriented polypropylene film is a film stretched in two directions, the machine direction (MD) and the transverse direction (TD), and because the resin is oriented in both the machine direction and the transverse direction, improving crystallinity, it is possible to improve thickness precision (e.g., thinning) and mechanical properties such as strength, and it is also excellent for mass production. The stretching ratio (sequential biaxial stretching, simultaneous biaxial stretching) is about 2 to 8 times in the machine direction (MD) and about 4 to 12 times in the transverse direction (TD).

[0054] When molding a film, constituent materials such as recycled resin raw materials and polypropylene-based resins are charged into a molding machine at a predetermined blending ratio, melted, and kneaded. Here, EVOH contained in the recycled resin raw materials is incompatible with polypropylene-based resins, so in the past, EVOH was stretched in the flow direction by drawdown during extrusion molding, resulting in streaky EVOH in the resin. When formed into a film, this resulted in insufficient tensile elongation, mainly in the transverse (TD) direction, and in some cases, this had adverse effects on film performance, such as reduced strength and poor appearance.

[0055] It is also conceivable to reduce the blending amount of recycled resin raw materials containing EVOH in order to suppress the influence of EVOH on film performance. However, the appropriate blending amount can vary greatly depending on the type of EVOH-containing molded product, etc. used as the recycled resin raw material. For example, the required film performance may not be obtained even if the blending amount of recycled resin raw materials is reduced, or good film performance may be obtained even if the constituent material is only recycled resin raw materials (100%). Therefore, when using EVOH-containing molded products, etc. as recycled resin raw materials, it is not necessarily possible to suppress the influence on film performance simply by adjusting the blending amount of recycled resin raw materials.

[0056] Therefore, the present inventors have conducted extensive research into the conditions under which film performance comparable to that of conventional films can be obtained while using recycled resin raw materials containing EVOH as a constituent material of the film. As a result, they have found that there is a correlation between the amount of OH groups contained in EVOH and the tensile properties of polypropylene films. That is, the polypropylene film containing recycled resin raw materials of the present invention has a peak height (P ＯＨ ) and CH ３ The peak height (P ＣＨ３ IR intensity ratio (P ＯＨ / P ＣＨ３ ) is less than 3.0.

[0057] FT-IR transmittance measurement is a Fourier transform infrared spectroscopy (FT-IR) method performed on optically transparent objects such as films. The object is irradiated with infrared light, and qualitative and quantitative analysis of the object is performed based on the absorbance spectrum of the transmitted infrared light. FT-IR transmittance measurement allows for non-destructive measurement of the object, and the constituent substances of the object can be analyzed based on the infrared wavelengths that appear as peaks in the absorbance spectrum. The peak height of the absorbance spectrum peak corresponds to the strength of absorbance, and the amount of a specific substance in the object can be determined based on the absorbance.

[0058] 1 shows the absorbance spectrum of a polypropylene film containing recycled resin raw materials according to one embodiment of the present invention. In the present invention, the absorbance spectrum shows peaks 10A and CH due to OH groups. ３ The peak height (P ＯＨ ) and CH ３ The peak height (P ＣＨ３ ) to the IR intensity ratio (P ＯＨ / P ＣＨ３ ) led to

[0059] The peak height (P ＯＨ ) corresponds to the content of EVOH in the polypropylene film, and 3340 cm －１Specifically, as shown in FIG. 2A, the both ends of the peak 10A derived from the OH group are set as base points 11a and 12a, and the straight line connecting the base points 11a and 12a is set as a baseline 13a. The height (P ＯＨ )

[0060] CH ３ The peak height (P ＣＨ３ ) corresponds to the content of polypropylene resin in the polypropylene film, and 1165 cm －１ The peak height P ＣＨ３ is the peak height P ＯＨ 2B, the height (P ＣＨ３ ) In the figure, the reference symbols 11b and 12b represent CH ３ This is the base point of peak 10B derived from the group.

[0061] IR intensity ratio (P ＯＨ / P ＣＨ３ ) corresponds to the ratio of the content of saponified vinyl acetate contained in EVOH to the content of polypropylene resin in the polypropylene film, which is not affected by the amount of recycled resin raw material mixed, and (P ＯＨ ) / (P ＣＨ３ ) is calculated from the IR intensity ratio (P ＯＨ / P ＣＨ３ In the IR intensity ratio (P), a larger value indicates a larger amount of EVOH in the polypropylene film, which affects its performance, and a smaller value indicates a smaller amount of EVOH in the polypropylene film, which affects its performance. ＯＨ / P ＣＨ３ ) is less than 3.0, preferably 2.6 or less, the stretchability in the transverse (TD) direction is good, and the influence of EVOH on the film properties can be suppressed.

[0062] In the polypropylene film of the present invention, the constituent materials are melted and kneaded during film formation. ＯＨ / P ＣＨ３ ) satisfies the condition of less than 3.0, it is preferable that the EVOH present in the polypropylene film be in the form of a sea-island phase-separated structure 20 composed of a sea region 21 and island regions 22, as shown in FIG. 3 . The sea region 21 is a polyolefin-based resin, or a polyolefin-based resin and a polypropylene-based resin when the constituent materials contain a polypropylene-based resin. On the other hand, the island regions 22 are EVOH that is incompatible with the sea region 21. When the EVOH is present in the film in the form of the island regions 22 of the sea-island phase-separated structure 20, the EVOH is appropriately dispersed in the film, thereby suppressing its impact on film performance. Note that the polyolefin-based resin and polypropylene-based resin that form the sea region 21 are described for convenience to distinguish between the polyolefin-based resin in the recycled resin raw material and the polypropylene-based resin blended as a constituent material, but in reality they are mixed together and indistinguishable.

[0063] Furthermore, as mentioned above, conventional polypropylene films containing EVOH have the problem of insufficient stretchability in the transverse (TD) direction, making them prone to breakage. This is thought to be because EVOH, which is incompatible with propylene-based resins, exists in the sea region of the film in the form of stripes in the machine direction (MD) (the direction of molding flow), resulting in insufficient connection of the sea region in the transverse (TD) direction (width direction).

[0064] Therefore, in the polypropylene film of the present invention, it is preferable that the maximum particle size of the EVOH granular island portions 22a present in the film cross section ( FIG. 3 ) when the film is cut perpendicular to the machine direction (MD) (molding flow direction) is 10 μm or less. The particle size 23 of the granular island portions 22a is the diameter in the longitudinal direction of the particle, as shown in the figure, and the maximum particle size is the largest diameter among the multiple granular island portions 22a contained in a unit area. If the maximum particle size of the EVOH granular island portions 22a is too large, the connection of the sea portion in the transverse (TD) direction in the polypropylene film may be insufficient, resulting in insufficient stretchability in the transverse (TD) direction. By setting the maximum particle size of the EVOH granular island portions 22a to 10 μm or less, it is believed that the connection of the sea portion in the transverse (TD) direction is easily maintained even when an incompatible EVOH is present in the sea portion, resulting in good stretchability in the transverse (TD) direction.

[0065] Furthermore, the granular island portions 22a preferably have an average particle size of 2 μm or less. When the average particle size of the granular island portions 22a is 2 μm or less, the island portions 22a as a whole become relatively small, and therefore the continuity of the sea portion in the transverse direction (TD) in the film can be more appropriately maintained. The average particle size is a value determined from a plurality of granular island portions 22a contained in a unit area.

[0066] In the case of an unstretched polypropylene film, the tensile properties of the polypropylene film are preferably such that the tensile strength in the transverse (TD) direction is 20 MPa or more and the tensile elongation is 300% or more according to JIS K 7127 (1999). If the tensile strength or tensile elongation in the transverse (TD) direction is too low, the performance as a general-purpose film will be insufficient. If the tensile properties of the unstretched polypropylene film satisfy the above conditions, it can be suitably used as a general-purpose sealant film, etc.

[0067] Furthermore, in the case of stretched polypropylene films (such as transversely uniaxially stretched films and biaxially stretched films) stretched at least in the transverse (TD) direction, the tensile strength in the transverse (TD) direction is preferably 150 MPa or more and the modulus of elasticity is preferably 1.5 GPa or more. If the tensile strength or modulus of elasticity in the transverse (TD) direction is too low, the performance as a general-purpose film will be insufficient. If the tensile properties of the stretched polypropylene film satisfy the above conditions, it can be suitably used as a general-purpose base film, etc.

[0068] As described above, the polypropylene film containing recycled resin raw materials of the present invention has a peak height (P ＯＨ ) and CH ３ The peak height (P ＣＨ３ IR intensity ratio (P ＯＨ / P ＣＨ３ ) is less than 3.0, the stretchability of the film in the transverse (TD) direction is good. Therefore, it is possible to identify the correlation between the EVOH content, which affects the film performance, and the stretchability of the polypropylene film, and it is possible to obtain a polypropylene film with film performance comparable to that of conventional polypropylene films by blending an appropriate amount of recycled resin raw material containing EVOH.

[0069] The polypropylene film of the present invention is suitable as a versatile film, for example, for use as a packaging film used alone or as one layer of a laminate formed by laminating multiple types of films. Furthermore, when the polypropylene film is used as one layer of a laminate, it is a film with excellent mechanical strength, heat resistance, etc., and therefore can be suitably used as a base layer of the laminate. This laminate is suitable as a packaging material for various items such as food, daily necessities, and parts, and can also contribute to reducing environmental impact because it contains a polypropylene film made from an EVOH-containing recycled resin raw material.

[0070] [Preparation of Polypropylene Films] For the preparation of the polypropylene films of Prototype Examples 1 to 19 and Comparative Examples 1 to 3, the materials described below were melt-kneaded at predetermined blending ratios (wt%), extruded by a T-die method, and cooled on a chill roll to form an unstretched polypropylene film. For the preparation of the polypropylene film of Prototype Example 20 and Comparative Example 4, the materials described below were melt-kneaded at predetermined blending ratios (wt%), extruded by a T-die method, cooled on a chill roll, and formed into a sheet having a thickness of approximately 20 μm after biaxial stretching. The sheet was stretched 5 times in the longitudinal direction and 8 times in the transverse direction to obtain a biaxially stretched film. In each prototype, the blending ratio of the materials was 100 wt%, and the materials used in each layer are shown in Tables 1 to 4.

[0071] [Polypropylene resin] PP1: Homopolypropylene (manufactured by Japan Polypropylene Corporation, "Novatec FL100A") PP2: Random polypropylene (manufactured by Japan Polypropylene Corporation, "Novatec FX4EA") PP3: Biopolypropylene (manufactured by LyondellBasell, "C14HP456J") PP4: Recycled polypropylene (manufactured by GUOLONG, "GL-0510F")

[0072] [EVOH-containing resin raw materials (corresponding to recycled resin raw materials)] EVOH1: Material obtained by melt-kneading and pelletizing a polypropylene film having an ethylene-vinyl alcohol-based resin layer, ethylene content 35 mol% EVOH2: Material obtained by re-kneading the above EVOH1 using a twin-screw kneading extruder, ethylene content 35 mol% EVOH3: Material obtained by dry-blending 50 wt% each of ethylene-vinyl alcohol copolymer resin (manufactured by Mitsubishi Chemical Corporation, "Soarnol GC3304B", ethylene content 33 mol%) and PP1, melt-kneading, and pelletizing (assuming a recycled resin raw material consisting of a polypropylene film having an ethylene-vinyl alcohol-based resin layer)

[0073] [Compatibilizer] ADD1: Compatibilizer (manufactured by The Dow Chemical Company, "Fusabond P613") ADD2: Compatibilizer (manufactured by Mitsubishi Chemical Corporation, "Soaresin RG500")

[0074] [Prototype Example 1] Prototype example 1 is a polypropylene film having a thickness of 75 μm obtained by blending 80 wt % of PP2 (random polypropylene) and 20 wt % of EVOH1 (EVOH-containing resin raw material).

[0075] [Prototype Example 2] Prototype Example 2 is a polypropylene film having a thickness of 65 μm obtained by changing the EVOH1 (EVOH-containing resin raw material) of Prototype Example 1 to 19 wt % and blending ADD1 (compatibilizer) at 1 wt %.

[0076] [Prototype 3] Prototype 3 is a polypropylene film having a thickness of 43 μm obtained by blending 70 wt % of PP1 (homopolypropylene) and 30 wt % of EVOH2 (EVOH-containing resin raw material).

[0077] [Prototype Example 4] Prototype Example 4 is a polypropylene film having a thickness of 28 μm obtained by changing the EVOH2 (EVOH-containing resin raw material) of Prototype Example 3 to 28.5 wt % and blending ADD1 (compatibilizer) at 1.5 wt %.

[0078] [Prototype Example 5] Prototype Example 5 is a polypropylene film having a thickness of 35 μm obtained by changing the compatibilizer in Prototype Example 4 from ADD1 to ADD2.

[0079] [Prototype Example 6] Prototype Example 6 is a polypropylene film having a thickness of 59 μm obtained by blending 60 wt % of PP2 (random polypropylene) and 40 wt % of EVOH1 (EVOH-containing resin raw material).

[0080] [Prototype Example 7] Prototype Example 7 is a polypropylene film having a thickness of 58 μm obtained by changing the recycled resin raw material of Prototype Example 6 from EVOH1 to EVOH2.

[0081] [Prototype Example 8] Prototype example 8 is a polypropylene film having a thickness of 65 μm obtained by blending 50 wt % of PP2 (random polypropylene) and 50 wt % of EVOH1 (EVOH-containing resin raw material).

[0082] [Prototype Example 9] Prototype Example 9 is a polypropylene film having a thickness of 72 μm obtained by blending 30 wt % of PP2 (random polypropylene) and 70 wt % of EVOH1 (EVOH-containing resin raw material).

[0083] [Prototype Example 10] Prototype example 10 is a polypropylene film having a thickness of 47 μm obtained by blending 20 wt % of PP2 (random polypropylene) and 80 wt % of EVOH1 (EVOH-containing resin raw material).

[0084] [Prototype Example 11] Prototype Example 11 is a polypropylene film having a thickness of 54 μm obtained by blending 70 wt % of PP3 (biopolypropylene) and 30 wt % of EVOH1 (EVOH-containing resin raw material).

[0085] [Prototype Example 12] Prototype Example 12 is a polypropylene film having a thickness of 65 μm obtained by blending 50 wt % of PP1 (homopolypropylene), 20 wt % of PP4 (recycled polypropylene), and 30 wt % of EVOH1 (EVOH-containing resin raw material).

[0086] [Prototype Example 13] Prototype Example 13 is a polypropylene film having a thickness of 54 μm obtained by blending 72 wt % of PP1 (homopolypropylene), 25 wt % of EVOH3 (EVOH-containing resin raw material), and 3 wt % of ADD1 (compatibilizer).

[0087] [Prototype Example 14] Prototype Example 14 is a polypropylene film having a thickness of 43 μm obtained by blending 100 wt % of EVOH1 (EVOH-containing resin raw material).

[0088] [Prototype Example 15] Prototype Example 15 is a polypropylene film having a thickness of 97 μm obtained by blending 100 wt % of EVOH2 (EVOH-containing resin raw material).

[0089] [Prototype Example 16] Prototype Example 16 is a 41 μm thick polypropylene film obtained by blending 47 wt % of PP1 (homopolypropylene), 50 wt % of EVOH3 (EVOH-containing resin raw material), and 3 wt % of ADD1 (compatibilizer).

[0090] [Prototype Example 17] Prototype Example 17 is a polypropylene film having a thickness of 73 μm obtained by blending 40 wt % of PP1 (homopolypropylene) and 60 wt % of EVOH3 (EVOH-containing resin raw material).

[0091] [Prototype Example 18] Prototype Example 18 is a polypropylene film having a thickness of 59 μm obtained by blending 50 wt % of PP1 (homopolypropylene) and 50 wt % of EVOH3 (EVOH-containing resin raw material).

[0092] [Prototype Example 19] Prototype Example 19 is a polypropylene film having a thickness of 249 μm obtained by blending 90 wt % of PP1 (homopolypropylene), 9.5 wt % of EVOH1 (EVOH-containing resin raw material), and 0.5 wt % of ADD1 (compatibilizer).

[0093] [Prototype Example 20] Prototype Example 20 is a polypropylene film having a thickness of 22 μm obtained by biaxially stretching a mixture of 90 wt % PP1 (homopolypropylene), 9.5 wt % EVOH1 (EVOH-containing resin raw material), and 0.5 wt % ADD1 (compatibilizer).

[0094] Comparative Example 1 Comparative Example 1 is a polypropylene film having a thickness of 77 μm obtained by blending 100 wt % of PP2 (random polypropylene).

[0095] Comparative Example 2 Comparative Example 2 is a polypropylene film having a thickness of 24 μm obtained by blending 100 wt % of PP1 (homopolypropylene).

[0096] Comparative Example 3 Comparative Example 3 is a polypropylene film having a thickness of 249 μm obtained by blending 100 wt % of PP1 (homopolypropylene).

[0097] Comparative Example 4 Comparative Example 4 is a polypropylene film having a thickness of 22 μm obtained by blending 100 wt % of PP1 (homopolypropylene) and biaxially stretching it.

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[0102] The polypropylene films of Prototype Examples 1 to 20 and Comparative Examples 1 to 4 were evaluated by a transverse (TD) direction tensile property test, FT-IR absorbance measurement, and particle size measurement of the island portions. The results and evaluations of each measurement are shown in Tables 5 to 8 below. In each measurement, the overall evaluation was determined as "good product (◯)" when there was no "failure (x)" in the judgment, and "failure (x)" when there was even one "failure (x)."

[0103] [Transverse (TD) Direction Tensile Property Test] For Prototype Examples 1 to 19 and Comparative Examples 1 to 3, which are unstretched polypropylene films, the tensile strength (MPa) and tensile elongation (%) in the transverse (TD) direction were measured as the tensile property test in the transverse (TD) direction. For Prototype Example 20 and Comparative Example 4, which are biaxially stretched polypropylene films, the tensile strength (MPa) and modulus of elasticity (GPa) in the transverse (TD) direction were measured as the tensile property test in the transverse (TD) direction. The tensile property test was performed in accordance with JIS K 7127 (1999) using a tensile tester (Shimadzu Corporation, "Autograph AGS-X"). In this tensile property test, for Prototype Examples 1 to 19, a tensile strength of 20 MPa or more and a tensile elongation of 300% or more were evaluated as "excellent (○)." In addition, in Prototype Example 20, a tensile strength of 150 MPa or more and a modulus of elasticity of 1.5 GPa were rated as "excellent (◯)," and those that did not meet these criteria were rated as "poor (×)." Note that, since Prototype Example 20 is a biaxially stretched film, measurement of tensile elongation was omitted.

[0104] [FT-IR Absorbance Measurement] FT-IR absorbance measurement was carried out on the polypropylene films of Prototype Examples 1 to 20. In the FT-IR absorbance measurement, a Fourier transform infrared spectrometer ("Spectrum Two" manufactured by PerkinElmer) was used, and the 400 cm －１ ~4000cm －１ From the obtained infrared absorption spectrum, the peak at 3340 cm originating from the OH group was observed. －１ The peak height (P ＯＨ ) and CH ３1165 cm from the base －１ The peak height (P ＣＨ３ ) was calculated, and the IR intensity ratio was determined as follows. In this absorbance measurement, an IR intensity ratio of less than 3.0 was judged as "excellent (◯)", and an IR intensity ratio of 3.0 or more was judged as "poor (×)". IR intensity ratio = (P ＯＨ ) / (P ＣＨ３ )

[0105] [Measurement of Island Particle Size] The particle size of the island portions was measured for the polypropylene films of Prototype Examples 2 to 5, 7, 9, 14, 16, and 18 to 20. For this measurement, the film was cut perpendicular to the machine direction (MD) (the molding flow direction), and the resulting cross section was cut with an ultramicrotome. The resulting film cross section was observed under an electron microscope, and the longitudinal diameter (particle size) of each island portion (EVOH resin portion) contained in a unit area in the image was measured, followed by the average particle size (μm) and maximum particle size (μm). In this measurement, an average particle size of 2 μm or less and a maximum particle size of 10 μm or less were evaluated as "excellent (○)," and those that did not meet these criteria were evaluated as "poor (×)."

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[0107]

[0108]

[0109]

[0110] [Results and Discussion] For polypropylene films made from recycled resin raw materials containing EVOH, the standard values ​​for the film stretchability (tensile properties in the transverse (TD) direction) assumed to be sufficient for use as a general-purpose film were set as follows: for unstretched polypropylene film, the tensile strength in the transverse (TD) direction was set to 20 MPa, and the tensile elongation was set to 300%, while for biaxially stretched polypropylene film, the tensile strength in the transverse (TD) direction was set to 150 MPa, and the modulus of elasticity was set to 1.5 GPa.

[0111] Comparative Example 1 is a polypropylene film made of PP1 (homopolypropylene) and made of PP2 (random polypropylene), both of which do not contain recycled resin raw materials (EVOH-containing resin raw materials). Comparative Example 3 is a thick (249 μm) polypropylene film made of PP1 and not containing recycled resin raw materials, and Comparative Example 4 is a biaxially oriented polypropylene film made of PP1 and not containing recycled resin raw materials.

[0112] In Comparative Examples 1 and 2, as shown in Table 8, the tensile properties (tensile strength, tensile elongation) in the transverse (TD) direction are extremely good because recycled resin raw materials containing EVOH are not blended into the film's constituent materials. This is also true for thick polypropylene films such as Comparative Example 3. On the other hand, in Comparative Example 4, which is a biaxially oriented polypropylene film, the tensile properties (tensile strength, modulus) in the transverse (TD) direction are also extremely good because recycled resin raw materials containing EVOH are not blended into the film's constituent materials. It is preferable that other polypropylene films blended with recycled resin raw materials exceed the above-mentioned stretchability standard value and have performance particularly similar to the stretchability of Comparative Examples 1 to 4.

[0113] As shown in Tables 5 to 8, the polypropylene films of Samples 1 to 20, which contained recycled resin raw materials (EVOH-containing resin raw materials), exhibited good stretchability in Samples 1 to 13, 19, and 20, whereas Samples 14 to 18 exhibited extremely poor stretchability, and Samples 15 to 18 in particular broke immediately during the tensile property test.

[0114] First, we will compare and examine the film's constituent materials and blending amounts between Prototype 8 and Prototype 18, which differ only in the type of recycled resin raw material. Although Prototype 8 and Prototype 18 had the same blending ratio of recycled resin raw materials, Prototype 8 had good tensile properties in the transverse (TD) direction, whereas Prototype 18 had extremely poor tensile properties in the transverse (TD) direction, to the point that it immediately broke. Furthermore, when the type of recycled resin raw material was different, for example, Prototypes 9 and 10 had good tensile properties even when the blending ratio of recycled resin raw materials was high, while Prototypes 16 to 18 had poor tensile properties even when the blending ratio of recycled resin raw materials was low. These findings demonstrate that it is difficult to identify conditions under which the blending ratio of recycled resin raw materials can suppress the impact on film performance.

[0115] Next, the peak height (P ＯＨ ) and CH ３ The peak height (P ＣＨ３ ), the IR intensity ratios were examined, and the IR intensity ratios were significantly different between Prototype 8 and Prototype 18. Comparing the IR intensity ratios of Prototypes 1 to 13, which exhibited good stretchability, with those of Prototypes 14 to 18, which did not, the IR intensity ratios of Prototypes 14 to 18 were all 3.0 or higher, and the IR intensity ratios of Prototypes 1 to 13 were all less than 3.0, regardless of the type and blending ratio of the polypropylene resin or recycled resin raw material. In particular, there was a significant difference in tensile elongation between Prototypes 1 to 13 and Prototypes 14 to 18, and the tensile elongation of Prototypes 1 to 13 all significantly exceeded the performance (300% or higher) required for a general-purpose film.

[0116] Furthermore, when comparing the relationship between IR intensity ratio and stretchability for Prototypes 1, 6, 8, 9, 10, and 14, which used the same polypropylene resin and recycled resin raw materials (PP2 and EVOH1) as constituent materials but varied the amount of recycled resin raw material (EVOH1) from 20 to 100 wt% (the amount of PP2 from 80 to 0 wt%), it was found that the lower the IR intensity ratio, the better the stretchability, and the higher the IR intensity ratio, the worse the stretchability. This suggests that there is a correlation between the IR intensity ratio and the stretchability of polypropylene films. Furthermore, since the tensile elongation significantly exceeds the required performance (300% or more) even for thick films such as Prototype 19, when the IR intensity ratio is less than 3.0, the film thickness is thought to have no effect on the stretchability of polypropylene films.

[0117] Thus, it was found that polypropylene films containing recycled resin raw materials can obtain good stretchability when the IR intensity ratio is less than 3.0, regardless of the amount of recycled resin raw materials added. Therefore, even if the amount of recycled resin raw materials added is simply reduced, if the IR intensity ratio is too high, the stretchability will be poor, and conversely, even if the amount of recycled resin raw materials added is high (for example, 100%), if the IR intensity ratio is low, the stretchability will be good.

[0118] Next, among Prototype Examples 2 to 5, 7, 9, 14, 16, and 18, the cross sections of the films were observed with an electron microscope. Comparing, for example, Prototype Example 2 with Prototype Example 4, which had a high IR intensity ratio, the tensile elongation was better than that of Prototype Example 2, which had a low IR intensity ratio. In Prototype Example 4, the average particle size and maximum particle size of the granular island portions (EVOH) in the film cross section were smaller than those of Prototype Example 2. From this, it is thought that in polypropylene films containing EVOH, if the average particle size and maximum particle size of the granular island portions (EVOH) are small, the effect of EVOH is further suppressed and stretchability is improved.

[0119] Furthermore, comparing Prototype 6 and Prototype 7, Prototype 7 differs in that the recycled resin raw material used was EVOH2, which was obtained by re-kneading EVOH1, the recycled resin raw material of Prototype 6, and the stretchability of Prototype 7 was better than that of Prototype 6. This is thought to be because the EVOH and other components were finely dispersed by re-kneading, reducing the influence of EVOH and improving the stretchability.

[0120] Comparing Prototype 3 with Prototypes 4 and 5, Prototypes 4 and 5 differ from Prototype 3 in that a compatibilizer (ADD1 or ADD2) was added, and they had better stretchability than Prototype 3. Therefore, it is believed that adding an appropriate amount of compatibilizer can reduce the effect of EVOH and improve stretchability.

[0121] As described above, in the polypropylene film using EVOH (recycled resin raw material), the peak height (P ＯＨ ) and CH ３ The peak height (P ＣＨ３ IR intensity ratio (P ＯＨ / P ＣＨ３ When the average particle size and maximum particle size of the granular island portions (EVOH) in the cross section of the film are reduced, the influence of EVOH on the film properties is more effectively reduced, and the stretchability of the film is improved.

[0122] On the other hand, in the biaxially stretched Prototype 20, the IR intensity ratio was 0.15, and therefore, like the unstretched films (Prototypes 1 to 13), the impact of EVOH on film performance was suppressed at an IR intensity ratio of less than 3.0, resulting in good stretching properties in the transverse (TD) direction of the film, and enabling stretching in the transverse direction like that of a conventional biaxially stretched film. Furthermore, based on the results of measuring the particle size of the island portions in Prototype 20, the relationship between the average particle size and maximum particle size of the island portions and film performance is also considered to be similar to that of the unstretched films (Prototypes 1 to 13). This indicates that polypropylene films using EVOH can be appropriately stretched in the transverse direction, while also achieving good tensile strength, resulting in film performance comparable to that of conventional biaxially stretched films.

[0123] The polypropylene film and laminate containing recycled resin raw materials of the present invention have an IR intensity ratio (P ＯＨ / P ＣＨ３ By producing a polypropylene film having a film strength of less than 3.0, it becomes possible to obtain film performance comparable to that of conventional films even when using recycled resin raw materials containing EVOH. Therefore, it becomes possible to effectively realize resource circulation even for recycled resin raw materials containing EVOH, which have been difficult to recycle in the past, and this can contribute to reducing the environmental load.

[0124] 10A Peak due to OH group 10B CH ３ Peaks derived from OH groups 11a, 12a Base points of peaks derived from OH groups 11b, 12b CH ３ Base point of peak derived from OH group 13a Baseline of peak derived from OH group 13b CH ３ Baseline of peak derived from OH group 14a Peak top of peak derived from OH group 14b CH ３ 15a: Peak top of the peak derived from the OH group; 15b: Perpendicular to the peak derived from the CH group ３ Perpendicular line of the peak derived from the group 20 Sea-island phase separation structure 21 Sea portion 22 Island portion 22a Particle-shaped island portion 23 Particle diameter of the particle-shaped island portion P ＯＨ Peak height derived from OH group P ＣＨ３ CH ３Peak height derived from group

Claims

1. A polypropylene film in which a recycled resin raw material containing an ethylene-vinyl alcohol resin and a polyolefin resin is included as a constituent material, wherein the polypropylene film has a peak height (P ＯＨ ) derived from an OH group and a peak height (P ３ ) derived from a CH ＣＨ３ group in an absorbance spectrum measured by an FT-IR transmission measurement method, and an IR intensity ratio (P ＯＨ / P ＣＨ３ ) of less than 3.

0. A polypropylene film containing a recycled resin raw material, characterized in that.

2. The recycled resin raw material-containing polypropylene film according to claim 1, wherein the ethylene-vinyl alcohol resin and the polyolefin resin in the polypropylene film have a sea-island type phase separation structure in which the polyolefin resin forms a sea portion and the ethylene-vinyl alcohol resin forms an island portion.

3. The recycled resin raw material-containing polypropylene film according to claim 1, wherein the constituent materials of the polypropylene film include the recycled resin raw material and a polypropylene resin.

4. The recycled resin raw material-containing polypropylene film according to claim 3, wherein the ethylene-vinyl alcohol resin, the polyolefin resin, and the polypropylene resin in the polypropylene film have a sea-island type phase separation structure in which the polyolefin resin and the polypropylene resin form a sea portion and the ethylene-vinyl alcohol resin forms an island portion.

5. The recycled resin raw material-containing polypropylene film according to claim 2 or 4, wherein the maximum particle size of the granular island portion composed of the ethylene-vinyl alcohol resin present in the film cross-section when the polypropylene film is cut in a direction perpendicular to the molding flow direction is 10 μm or less.

6. The recycled resin raw material-containing polypropylene film according to claim 1 or 2, wherein the polypropylene film is made of an unstretched polypropylene film, and the tensile strength in the width (TD) direction of the unstretched polypropylene film conforming to JIS K 7127 (1999) is 20 MPa or more, and the tensile elongation is 300% or more.

7. The recycled resin raw material-containing polypropylene film according to claim 3 or 4, wherein the polypropylene film is made of an unstretched polypropylene film, and the tensile strength in the width (TD) direction of the unstretched polypropylene film conforming to JIS K 7127 (1999) is 20 MPa or more, and the tensile elongation is 300% or more.

8. The recycled resin raw material-containing polypropylene film according to claim 1 or 2, wherein the polypropylene film is made of a stretched polypropylene film stretched at least in the width (TD) direction, and the tensile strength in the width (TD) direction of the stretched polypropylene film conforming to JIS K 7127 (1999) is 150 MPa or more, and the elastic modulus is 1.5 GPa or more.

9. The recycled resin raw material-containing polypropylene film is made of a stretched polypropylene film stretched at least in the width (TD) direction, and the tensile strength in the width (TD) direction of the stretched polypropylene film conforming to JIS K 7127 (1999) is 150 MPa or more, and the elastic modulus is 1.5 GPa or more. The recycled resin raw material-containing polypropylene film according to claim 3 or 4.

10. The recycled resin raw material-containing polypropylene film according to claim 3, wherein the polypropylene-based resin contains a recycled raw material.

11. The recycled resin raw material-containing polypropylene film according to claim 3, wherein the polypropylene-based resin contains a biomass raw material.

12. A laminate comprising the recycled resin raw material-containing polypropylene film according to claim 6.

13. A laminate comprising the recycled resin raw material-containing polypropylene film according to claim 7.

14. A laminate comprising the recycled resin raw material-containing polypropylene film according to claim 8.

15. A laminate comprising the recycled resin raw material-containing polypropylene film according to claim 9.

Images