Flexible pouch using post-consumer resin

Abstract

To provide a flexible pouch.SOLUTION: The flexible pouch of the present invention comprises a first layer structure and a second layer structure. Each layer structure includes (i) an inner liner and (ii) an outer sheath. The first layer structure is superimposed onto the second layer structure such that the inner liners face each other. The first layer structure superimposed onto the second layer structure defines a common peripheral marginal part. Each inner liner is constructed of a flexible film made of a polymeric material. Each outer sheath is constructed of a post-consumer recycled (PCR) polymer material. The PCR polymer material has a GI200 value of greater than 50. The flexible pouch includes a peripheral seal. The peripheral seal extends along at least a portion of the common peripheral marginal part. The peripheral seal seals the first layer structure to the second layer structure.SELECTED DRAWING: Figure 1

Description

[Background technology]

[0001] Social, political, and economic pressures are driving the industry towards post-consumer resin polyolefins. The use of polymeric materials (PCR) is being promoted. The environmental hazards of post-consumer resins (PCRs) are well known. Large-scale societal efforts are being adopted to recycle and reuse used plastic materials. Efforts to reprocess PCR and reincorporate it into usable consumer items continue to grow.

[0002] In flexible film applications, the inherent variability of PCR is a major concern in high performance liquid flexible packaging. The fundamental waste aspect of PCR makes it difficult to use for malaria. This means that the product will suffer from an odor nuisance, which can contribute to an unpleasant taste when in contact with food. These drawbacks of R make it difficult to use in food contact applications.

[0003] In liquid packaging, the package structure serves two basic roles: For example, a flexible pouch for holding a liquid can be used without leaking the liquid contents and for 100,000 times the capacity. The failure rate must be maintained at less than one leak per 10 flexible packages. Another challenge facing packaging is that flexible pouches must be able to hold liquid contents as well as The key point is that the product must have sufficient structural integrity to withstand the supply chain. In other words, flexible pouches are used in processing, filling, warehousing, distribution, merchandising, and of adequate construction, integrity, and strength to withstand the rigors and stresses of consumer use. It must be strong enough.

[0004] The art has not yet been able to provide a flexible package capable of containing PCR and functioning as a flexible pouch. that is, leak-proof and strong enough to withstand and function through the supply chain. We recognize the need for pouches with prescription. Summary of the Invention

[0005] Applicant has developed a package configuration that is leak-proof and supports liquid contents, which also utilizes PCR. I discovered it.

[0006] The present disclosure provides a flexible pouch. In one embodiment, the flexible pouch comprises a first layer structure Each layer structure includes (i) an inner liner, and (ii) an outer liner. The first layer structure is overlaid on the second layer structure so that the inner liners face each other. The first layer structure superimposed on the second layer structure has a common peripheral edge. Each inner liner is constructed of a flexible film of polymeric material. The sheath is constructed from a post-consumer recycled (PCR) polymer material. The polymeric material has a GI200 value of greater than 50. The flexible pouch includes a peripheral seal. The peripheral seal extends along at least a portion of the common peripheral edge. The layer structure is sealed to a second layer structure. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a top plan view of a flexible pouch in an exploded configuration according to an embodiment of the present disclosure.

[0008] definition Any reference to the Periodic Table of the Elements is to the Periodic Table of the Elements, 1990-present, by CRC Press, Inc. As published in 1991. References to groups of elements in this table are by group number. Based on a new notation system for naming.

[0009] For purposes of U.S. patent practice, the contents of any referenced patent, patent application, or publication is specifically incorporated herein by reference in its definition disclosure (to the extent not inconsistent with any definitions specifically provided in this disclosure), and and general knowledge in this technical field, which are incorporated by reference in their entirety. (or its equivalent U.S. version, so incorporated by reference).

[0010] Numerical ranges disclosed herein include the lower and upper limits. Includes all values. Distinct numeric values ​​(e.g., 1 or 2, or 3-5, or 6, or 7), any subrange between any two explicit numbers (e.g., 1-2, 2-6, 5-7, 3-7, 5-6, etc.

[0011] Unless stated to the contrary or customarily stated otherwise in the art, Unless otherwise indicated, all parts and percentages are by weight unless otherwise indicated by the context. All test methods are current as of the filing date of this disclosure.

[0012] As used herein, the term "blend" or "polymer blend" refers to two Such a blend is miscible (phase separated at the molecular level). Such blends may or may not be phase separated. Such blends can be analyzed by transmission electron spectroscopy, light scattering, X-ray scattering, and other techniques known in the art. The domain structure may or may not contain one or more domain configurations determined from other methods.

[0013] The term "composition" refers to a mixture of materials that make up the composition, as well as to a mixture of materials from the composition. refers to reaction and decomposition products formed from

[0014] The terms "comprise," "include," "have," and their derivatives are used to refer to Any additional components, steps, or methods, whether specifically disclosed or not, are not intended to be limiting. For the avoidance of doubt, the word "comprises" is not intended to exclude the existence of procedures. All compositions claimed through the use of the term "compound" shall be Unless otherwise specified, any additional additives, adjuvants, or In contrast, the term "consisting essentially of" refers to a compound that is not essential for operability. Unless otherwise specified, any other component, step, or procedure may be omitted from any subsequent description. The term "consisting of" excludes any ingredient, The term "or" does not apply to any list unless expressly stated otherwise. The use of the singular shall include the use of the plural. It includes, and vice versa.

[0015] "Ethylene-based polymer" means 50 weight percent (based on the total amount of polymerizable monomers) % (by weight) of polymerized ethylene monomer, optionally containing at least Ethylene-based polymers include ethylene homopolymers and and ethylene copolymers (meaning units derived from ethylene and one or more comonomers). The terms "ethylene-based polymer" and "polyethylene" are used interchangeably. Non-limiting examples of ethylene-based polymers (polyethylenes) include low density polyethylenes. Non-limiting examples of linear polyethylene include ethylene (LDPE) and linear polyethylene. Typical examples are linear low density polyethylene (LLDPE), ultra low density polyethylene (UL DPE), very low density polyethylene (VLDPE), multi-component ethylene copolymer (EPE) ), ethylene / α-olefin multiblock copolymer (olefin block copolymer - (also known as OBC), substantially linear or linear plastomer / elastomeric polymers Polyethylenes include polyethylene, polyethylene copolymers, and high density polyethylene (HDPE). Heterogeneous catalyst systems such as Ziegler-Natta catalysts, Group 4 transition metals and metallocenes, non-metallic Cen-metal center, heteroaryl, heteroatom aryloxy ether, phosphinimine Homogeneous catalyst systems containing ligand structures such as They can be produced in a heterogeneous catalyst and / or a homogeneous process reactor. A catalyst combination may also be used in either a single reactor or dual reactor configuration. do.

[0016] "Ethylene plastomer / elastomer" refers to a polymer that contains units derived from ethylene and at least Both C3-C 10 Uniform short-chain branches containing units derived from α-olefin comonomers a substantially linear or linear ethylene / α-olefin copolymer containing a distribution Ethylene plastomer / elastomer has a viscosity of 0.860g / cc to 0.917g / cc. Non-limiting examples of ethylene plastomers / elastomers include AFFI NITY™ Plastomers and Elastomers (The Dow Chemical Company), EXACT™ plastomer (ExxonMob available from Il Chemical), Tafmer™ (available from Mitsui Nexlene™ (available from SK Chemicals Co.); and Lucene™ (available from LG Chem Ltd.).

[0017] "High density polyethylene" (or "HDPE") is an ethylene homopolymer, or At least one C4~C 10 α-olefin comonomer or C4~C8 α-olefin It is an ethylene / α-olefin copolymer with a copolymer of ethylene and α-olefin, and has a viscosity of 0.940 g / cm c, or 0.945g / cc, or 0.950g / cc, or 0.953g / cc ~0.955g / cc, or 0.960g / cc, or 0.965g / cc, or Has a density of 0.970g / cc, 0.975g / cc, or 0.980g / cc HDPE can be a unimodal copolymer or a multimodal copolymer. The molecular weight distribution of the "olefin copolymer" is shown by gel permeation chromatography (GPC). Ethylene / C4-C with one clear peak 10 It is an alpha-olefin copolymer. "Multimodal ethylene copolymer" means that there are at least two different molecular weight distributions in the GPC. Ethylene / C4-C with peak 10 It is an α-olefin copolymer. Copolymers with one peak (bimodal) and copolymers with three or more peaks Non-limiting examples of HDPE include DOW™ High Density Polyethylene (HDPE ) resin (available from The Dow Chemical Company), ELIT E™ reinforced polyethylene resin (The Dow Chemical Company) ), CONTINUUM™ bimodal polyethylene resin (available from The Dow (available from Lyon Chemical Company), LUPOLEN™ (Lyon available from NelsonBasell), as well as Borealis, Ineos, and and HDPE products from ExxonMobil.

[0018] An "interpolymer" is a polymer prepared by the polymerization of at least two different monomers. This generic term refers to polymers prepared from two different monomers, and Polymers prepared from three or more different monomers, e.g., terpolymers, tetrapolymers This includes copolymers, which are commonly used to refer to copolymers such as olefins, olefins, and copolymers.

[0019] "Linear low density polyethylene (or "LLDPE")" is a polymer derived from ethylene. and at least one C3-C 10 α-olefins, or C4 to C8 α-olefins A linear olefin copolymer containing a heterogeneous distribution of short chain branches including units derived from a fin comonomer. LLDPE is a styrene / α-olefin copolymer. In contrast to conventional LDPE, LLDPE is characterized by little, if any, long chain branching. Non-limiting examples of LLDPE include TU FLIN™ linear low density polyethylene resin (The Dow Chemical Company) DOWLEX™ polyethylene resins (available from The Dow Chemical Company), and MARLEX™ Poly Ethylene (available from Chevron Phillips) is an example.

[0020] "Low-density polyethylene" (or "LDPE") is an ethylene homopolymer, or Long chain copolymer with a density of 0.915g / cc to 0.940g / cc and a wide MWD At least one C3-C containing branch 10 α-olefin or C4-C8 α-olefin LDPE is typically made from ethylene / α-olefin copolymers containing Free radical polymerization (tubular reactor or autoclave using free radical initiators) Non-limiting examples of LDPE include MarFlex™ (Che Vron Phillips), LUPOLEN(TM)(LyondellBasel l), as well as LDP from Borealis, Ineos, ExxonMobil, etc. E products are an example.

[0021] "Multicomponent ethylene-based copolymers" (or "EPEs") are copolymers derived from ethylene. Units, and patent documents U.S. Patent Nos. 6,111,023, 5,677,383, and and at least one of C3 to C4 described in Patent No. 6,984,695, etc. 10 α-Olefin EPE resins contain units derived from olefins or C4-C8 α-olefin comonomers. The resin has a density of 0.905 g / cc to 0.962 g / cc. A suitable example is ELITE™ reinforced polyethylene (The Dow Chemical Company l Company), ELITE AT™ Advanced Technology Resin (The (available from The Dow Chemical Company), SURPASS™ polymer Polyethylene (PE) resin (available from Nova Chemicals), and SMA RT™ (available from SK Chemicals Co.).

[0022] "Olefin polymer" or "polyolefin" refers to a polymer that is a polymer of (a total amount of polymerizable monomers) a polymer containing greater than 50 weight percent polymerized olefin monomers (based on , and optionally, may contain at least one comonomer. Non-limiting examples of olefin-based polymers include: Examples include ethylene-based polymers or propylene-based polymers.

[0023] "Polymer" means any substance in polymerized form, whether of the same or different type. The multiple and / or repeating "units" or "mer units" that make up a polymer It is a compound prepared by polymerizing the monomers provided. The generic term "polymer" is usually used to refer to polymers prepared from only one type of monomer. The term homopolymer is used, and is prepared from at least two types of monomers. It also includes the term copolymer, which is commonly used to refer to polymers that have been It also includes copolymers of all types, such as random and block copolymers. / α-olefin polymer" and "propylene / α-olefin polymer" are each a mixture of ethylene or propylene and one or more additional polymerizable α-olefin monomers. The copolymers shown are those prepared by polymerizing a copolymer of the above with a monomer. If the polymer is "made of" one or more specific monomers, it is "made of" a specific monomer or monomer type. Although the term "based on," "containing," etc., is used in this context, The term "monomer" refers to the polymerized residue of a particular monomer, not to the non-polymerized species. It should be noted that it is understood that polymers herein are not equivalent to the corresponding molecules. It refers to those based on the "unit" which is the polymerization form of the monomer.

[0024] "Propylene-based polymers" are 50% by weight (based on the total amount of polymerizable monomers) A polymer containing more than one polymerized propylene monomer, optionally containing at least one Propylene-based polymers include propylene homopolymers and propylene copolymers. propylene copolymer (meaning units derived from propylene and one or more comonomers) The terms "propylene-based polymer" and "polypropylene" are used interchangeably. Non-limiting examples of suitable propylene copolymers include propylene copolymers Impact copolymers and propylene random copolymers are included.

[0025] "Ultra-low density polyethylene (or "ULDPE")," and "very low density polyethylene" Each of the "VLDPE" and "VLDPE" groups contains units derived from ethylene and at least one C3-C 10 It contains a heterogeneous distribution of short chain branches, including units derived from α-olefin comonomers. ULDPE and VLDPE are linear ethylene / α-olefin copolymers with The densities of ULDPE and ULDPE are 0.885g / cc to 0.915g / cc, respectively. and VLDPE include, but are not limited to, ATTANE™ very low density polyethylene resins. (available from The Dow Chemical Company) and FLEXO MER™ Very Low Density Polyethylene Resin (The Dow Chemical Company) (Available from the company).

[0026] Test Method Density is measured according to ASTM D792, Method B. Results are reported in cubic centimeters. It is reported in grams per cc (g / cc).

[0027] Differential Scanning Calorimetry (DSC). Differential scanning calorimetry (DSC) is used to measure the temperature over a wide range of The melting, crystallization, and glass transition behavior of polymers over a wide temperature range can be measured. For example, TA Instru has an RCS (refrigerated cooling system) and an autosampler. This analysis is carried out using a Q1000 DSC. A nitrogen purge gas flow rate of 1000 rpm was used. Each sample was melt-pressed to a thin film at approximately 175°C. The melted sample is then air-cooled to room temperature (approximately 25°C). A 3-10 mg, 6 mm diameter specimen was extracted from the sample and weighed. 50 mg) placed in an aluminum pan and crimped shut. Then, its thermal properties An analysis is performed to determine:

[0028] The thermal behavior of the sample is measured by raising and lowering the sample temperature to create a heat flow vs. temperature profile. First, the sample is rapidly heated to 180°C and then cooled to remove its thermal history. The sample was then cooled to -40°C at a rate of 10°C / min. The sample is then isothermally held at -40°C for 3 min. The sample is then heated at a rate of 10°C / min for 18 min. 0°C (this is the "second heat" ramp). Cooling curve and second heat The cooling curve is recorded. The crystallization begins at -20°C, and the baseline endpoint is recorded. The heating curve is analyzed by setting a baseline interval from -20°C to the end of melting. The analysis is performed by setting endpoints. The determined values ​​are used as the extrapolated onset of melting. Tm and the extrapolated onset of crystallization Tc (in joules per gram). Heat of fusion (H f ), and the crystalline structure of the polyethylene sample calculated using the following equation: Crystallinity %: Crystallinity % = ((H f ) / 292J / g)x100. The glass transition temperature Tg is B ernhard Wunderlich,The Basis of Thermal Analysis,in Thermal Characterization of Polymeric Materials 92,278-279(Edith AT As described in [Illegible Text] (2nd ed., 1997), the liquid heat capacity increased in half of the sample. The DSC heating curve is determined by adding a base line below and above the glass transition region. The heat capacity of the sample is then calculated and extrapolated through the Tg region. The temperature is Tg.

[0029] GI200 is defined as the sum of the areas of all gels with a diameter greater than 200 microns. It is defined as a signal from OCS Optical Control Systems GmbH. A handheld illumination unit, CCD detector, and gel counter software version 5. an OCS FSA-100 line gel counter consisting of an image processor equipped with a 0.4.6 or equivalent to determine GI200. 3 Films, or 0.324 m for a film thickness of 76 μm 2 Define it as and analyze 25 pieces. do.

[0030] Gel count: Gel count is the number of gels detected by the gel camera. The collected gels were measured to have the following area equivalent to a circular diameter: less than 100 microns. Full, 100-150 microns, 150-200 microns, 200-400 microns, 40 0-800 microns, 800-1600 microns, and over 1600 microns categories GI200 is divided into 25 pieces (24.6 cm 3 per film Gel G1200 unit mm 2 ) have a diameter of more than 200 microns, averaged over It is defined as the sum of the areas of all gels. The diameter of a gel is the diameter of a circle with an equivalent area. It is determined as 24.6 cm in one analysis cycle. 3 Inspect the film on the corresponding surface. The area is 0.324 m for a film thickness of 76 microns. 2 and a film thickness of 38 microns So 0.647m 2 Alternatively, gel ppm may be measured using the techniques described above, GI200 is approximately gel ppm divided by 3.

[0031] Melt flow in g / 10 min according to ASTM D1238 (230°C / 2.16 kg) Measure the flow rate (MFR).

[0032] The melt index (MI) (I2) in g / 10 min is calculated according to ASTM D1238 (1 90°C / 2.16kg).

[0033] The yellowness index (YI) of granular and pelletized polyethylene is based on Standard T est Method for Color Determination of Pl ASTM Procedure D6290, and Standard Practice for Calculating Yellowness and Whiteness Indices from Instrumentally Me Hunt, according to the certified color coordinates E313 This is achieved using a er Color FlexEZ™ spectrometer. DETAILED DESCRIPTION OF THE INVENTION

[0034] The present disclosure provides a flexible pouch. In one embodiment, the flexible pouch comprises a first layer structure Each layer structure includes (i) an inner liner, and (ii) an outer liner. The first layer structure is overlaid on the second layer structure so that the inner liners face each other. The first layer structure superimposed on the second layer structure has a common peripheral edge. Each inner liner is constructed of a flexible film of polymeric material. The sheath is constructed from a post-consumer recycled (PCR) polymer material. The polymeric material has a GI200 value of greater than 50. The flexible pouch includes a peripheral seal. The peripheral seal extends along at least a portion of the common peripheral edge. The layer structure is sealed to a second layer structure.

[0035] The flexible pouch includes a first layer structure and a second layer structure. The term "layer structure" as used herein means a structure consisting of at least two distinct structures: (i) an inner liner; and (ii) an outer sheath. The inner liner and outer sheath are , each flexible, flat, and made of extruded or cast thermoplastic material. The inner liner and outer sheath are each made of 0 Consistent and uniform thickness from 0.25 millimeters (mm) to 6.35 mm (250 mils) do.

[0036] Each layered component (i.e., inner liner and outer sheath) is made of a single polymer. The layer structure may be composed of a material or a blend of two or more polymer materials, and each layer structure component may be: They have either a single layer or a multilayer construction (coextruded multilayer and / or laminated multilayer).

[0037] The first layer structure is superimposed on the second layer structure so that the inner liners face each other. The first layer structure superimposed on the second layer structure defines a common peripheral edge. The common peripheral edge defines a peripheral shape of the flexible pouch. Shape (triangle, square, rectangle, rhombus, pentagon, hexagon, heptagon, octagon, etc.) or oval The shape may be oval, elliptical, or circular.

[0038] The first layer structure and the second layer structure each include an inner liner. The second layer structure includes a first inner liner. The second layer structure includes a second inner liner. Each inner liner Each inner liner is constructed of a flexible film made of a polymeric material. It is strong, flexible, deformable and pliable.

[0039] In one embodiment, each inner liner is a flexible multi-layer film having at least three layers. The flexible multilayer film has an A / B / A layer structure. Layer A is made of LLDPE. Layer B is an abuse layer comprised of an ethylene-based polymer. A / B / A flexible multilayer film is a 20 / 60 / 20 layer structure. The flexible multilayer film has a thickness of 10 microns or 20 microns to 40 microns or has a thickness of 80 microns.

[0040] In one embodiment, the flexible multilayer film of each inner liner has an A / B / C / B / A layer structure. Layer A is a sealant layer made of LLDPE. Layer B is a sealant layer made of maleic anhydride. The tie layer is comprised of a phosphoric acid grafted ethylene-based polymer or polymer blend. Layer C is a barrier layer such as polyamide or ethylene-vinyl alcohol (EVOH). A / B / C / B / A flexible multilayer film has a layer volume of 15 / 5 / 60 / 5 / 15. The flexible multilayer film is 10 microns or 20 microns to 40 microns or 80 The barrier layer has a thickness of 1 micron. It is designed to prevent the penetration of oxygen and / or fragrance. It can work.

[0041] The first layer structure and the second layer structure each include an outer sheath. The second layer structure includes a second outer sheath. Each outer sheath is It is constructed of post-consumer recycled (PCR) polymer material. The PCR used has a GI200 value of >50.

[0042] The term "post-consumer resin" or "PCR" refers to a resin that was previously used for consumer polymers. It is a polymer material that has been used as packaging or industrial packaging. For example, PCR is waste plastic. PCR is typically used in recycling programs and recycling. PCRs are typically collected from the production plant after additional testing before they can be reintroduced into the manufacturing line. PCR requires cleaning and processing of ethylene-based polymers, propylene-based polymers, and , polyester, poly(vinyl chloride), polystyrene, acrylonitrile butadiene styrene polyethylene, polyamide, ethylene vinyl alcohol, ethylene vinyl acetate, or polyvinyl chloride The PCR may contain one or more contaminants. This may be the result of using polymer materials before they are slightly modified for reuse. In some embodiments, the contaminants are in addition to the polymers resulting from the regeneration process. may contain paper, ink, food residue, or other recycled materials. It is understood to include pasteurized resin (PIR) resins.

[0043] PCR differs from virgin polymeric materials in that it is the initial heating and molding process that PCR is not a "virgin" polymer material because it has undergone a process. "Material" refers to a polymer that has not been subjected to or has not been subjected to a heating or forming process. PCR resins are polymer materials that have improved physical and chemical properties compared to virgin polymer resins. They have different chemical and flow properties.

[0044] In one embodiment, the PCR is polyethylene-PCR. Non-limiting examples of sources include HDPE plastic bottles (milk jugs, juice containers, etc.). Packaging, and LDPE / LLDPE packaging such as film Polyethylene-PCR also contains residues from its original use, such as paper, glue, ink, and Iron, ethylene vinyl alcohol (EVOH), polyamide (PA), polyethylene terephthalate Contains residues such as polyethylene terephthalate (PET), and other odor-causing agents.

[0045] Non-limiting examples of suitable PCR include EcoPrime™, PRISMA™, Trademark), Natural HDPE PCR Resins, Mixed Color and Black HDPE PCR Resins under the trade name Envision P PC sold by Lastics (North Carolina, USA) R, the following product names: KWR101-150, KWR101-150-M5-BLK, KWR 101-150-M10 BLK, KWR102-8812 BLK, KWR102, K WR102LVW, KWR105, KW620, KWR102-M4, KWR-105M 2, KWR105M4, KWR621 FDA, KWR621-20-FDA, KW30 8A, KW621, KW621-T10, KW621-T20, KW622-20, KW 622-35, KW627C, KW1250G, and KWBK10-NB for KW Pl Examples of such PCR include those sold by Astics (Alabama, USA).

[0046] In one embodiment, the outer sheath is composed of 100% PCR by weight, is based on the total weight of the outer sheath.

[0047] In one embodiment, in addition to the PCR, the outer sheath may optionally comprise an olefin-based polymer. The olefin-based polymer may include a propylene-based polymer or an ethylene-based polymer. Non-limiting examples of propylene-based polymers include propylene copolymers, propylene homopolymers, and combinations thereof. The propylene-based polymer is a propylene / α-olefin copolymer. Non-limiting examples of fins include C2 and C4-C 20 α-olefins or C4~ C 10 α-olefins or C4 to C8 α-olefins. The olefins include ethylene, 1-butene, 1-pentene, 1-hexene, and 1-heptene. In one embodiment, the olefin-based polymer may be virgin It is an olefin polymer.

[0048] In one embodiment, the propylene / α-olefin copolymer is propylene / ethylene More than 50% by weight, or 51% by weight, of units derived from propylene, based on the weight of the copolymer , or 55% by weight, or 60% to 70% by weight, or 80% by weight, or 90% by weight % by weight, or 95% by weight, or 99% by weight of propylene-derived units Propylene / ethylene copolymer is a propylene / ethylene copolymer. Based on the weight of the copolymer, the reciprocal amount of units derived from ethylene, or 50 times less than 49% by weight, or 45% by weight, or 40% to 30% by weight, is 20% by weight, or 10% by weight, or 5% by weight, or 1% by weight, or 0% by weight Contains units derived from ethylene.

[0049] In one embodiment, the olefin-based polymer is an ethylene-based polymer. The polymer may be an ethylene homopolymer or an ethylene / α-olefin copolymer. do.

[0050] In one embodiment, the ethylene-based polymer is an ethylene / α-olefin copolymer. Non-limiting examples of suitable α-olefins include C3-C 20 α-olefins, and is C4~C 10 Examples include α-olefins and C4 to C8 α-olefins. Common α-olefins include propylene, 1-butene, 1-pentene, 1-hexene, and 1-hexane. These include 1-butene, 1-butene, and 1-octene.

[0051] In one embodiment, the outer sheath comprises 5%, or 20%, or 30% by weight of %, or 40% by weight, or 50% to 60% by weight, or 70% by weight, if or 80% by weight or 95% by weight of PCR and the reciprocal amount of unused olefin or 95% by weight, or 80% by weight, or 70% by weight, or 60% by weight, or 50% by weight to 40% by weight, or 30% by weight, or 20% by weight %, or 5 wt. % virgin olefin-based polymer. The weight percentages are: Based on total weight of outer sheath.

[0052] The outer sheath made of PCR has a GI200 value of greater than 50. In one embodiment The PCR of the outer sheath is 100, 200, 500, 1000, or 50 In a further embodiment, the PCR has a GI200 value of 10,000 or 10,000. 100-10,000, or 200-5000, or 300-1600, or 30 It has a GI200 value of 0-1000.

[0053] In one embodiment, the outer sheath is used to protect the ink or to seal the ink during the heat sealing process. Surface printing and / or coating with high temperature lacquer to provide heat protection to the surface during It will be googled.

[0054] In one embodiment, each layer structure comprises between 10 volume percent (vol%) and 90 volume% of the outer shell. and the reciprocal volume percent of the inner liner, or 90% to 10% by volume of the inner liner. Includes side liners. Volume percent is based on the total volume of the layered structure.

[0055] In one embodiment, each layer structure comprises greater than 50% to 95% by volume of the outer sheath, and the reciprocal Contains 50% to 5% by volume of inner liner or less than 50% by volume of inner liner .

[0056] The flexible pouch includes a peripheral seal. The peripheral seal is formed by sealing at least one of the common peripheral edges. In one embodiment, the peripheral seal extends along the entire common peripheral edge. The peripheral seal forms a storage compartment within the flexible pouch.

[0057] In one embodiment, the flexible pouch comprises a first layer structure and a second layer structure along a peripheral seal. The peripheral seal includes a fixture disposed between the first layer structure and the second layer structure. Hermetically seal the container.

[0058] The perimeter seal seals or bonds the first layer structure to the second layer structure. Sealing can be done by ultrasonic sealing, heat sealing, adhesive sealing, or a combination of these methods. The peripheral seal is formed by opposing seals on each inner liner that are in direct contact with each other. Includes a core layer.

[0059] In one embodiment, the perimeter seal is formed by a heat sealing procedure. The term "heat sealing" as used herein refers to the sealing of the opposing inner surfaces (sealing layers) of a layer structure. The layers are brought into contact, melted, heat sealed, or welded together to adhere the layers to one another. The two layer structures are placed between opposing heat seal bars so that the heat seal bars face each other. Heat sealing is the act of sandwiching a layer structure and applying heat and pressure to the layer structure. The seal bars are moved towards and against each other to perform the heat sealing procedure. As a result, the term "thermal" as used herein includes suitable structures and mechanisms for moving the The term "seal" refers to the weld formed between two layer structures that are subjected to a heat sealing process. the weld is formed from the melted polymeric material from the first heat-sealed layer structure, and Also comprised of molten polymer material from the second heat sealed layer structure, The mer material then solidifies.

[0060] In one embodiment, the peripheral seal comprises a heat seal between opposing inner liners. In one embodiment, each inner liner is a flexible multilayer film having an A / B / A structure. The heat seal is formed by bonding the A layer material of the first inner liner and the A layer material of the second inner liner. The welded part is formed by

[0061] In one embodiment, the peripheral seal is between the outer sheath and its respective inner liner. The heat seal includes a weld between the first inner liner and the first outer sheath. The heat seal also includes a weld between the second inner liner and the second outer sheath.

[0062] In one embodiment, when the perimeter seal is viewed in cross section, the perimeter seal has the following layer structure: It has a first outer sheath / first inner liner / second inner liner / second outer sheath. The " / " indicates the boundary surface of each layer. It is understood that a welded portion exists at the boundary surface " / " of each layer. do.

[0063] In one embodiment, the peripheral seal comprises a first outer liner heat sealed to a first inner liner. a first inner liner heat sealed to a second inner liner, and a second outer liner. The second inner liner is heat sealed to the outer liner.

[0064] In one embodiment, the peripheral seal is the only seal or seal that is otherwise attached to the inner liner. The only seal between the inner liner and its respective outer sheath. There is no adhesive contact at the interface other than the peripheral seal. The inner surface is in contact with or direct contact with the outer surface of its respective inner liner, As used herein, "adhesive contact" refers to a lack of or otherwise non-existent adhesive contact. The term "contact" refers to the contact and fixing mechanism between the films relative to each other. The terms "direct contact" or "being in direct contact" or similar terms are used in One film layer is disposed directly adjacent to a second film layer, and the first film layer is disposed adjacent to the second an intervening layer and / or a second intervening layer in contact with the first film layer and the second film layer; refers to a film layer structure with no intervening structure. In this method, except for the peripheral seal, A gap or void exists between the inner liner and its respective outer sheath.

[0065] The peripheral seal seals the first layer structure to the second layer structure and separates each outer sheath from its respective The gap between the inner liner and the flexible pouch is in an area where the peripheral seal does not extend. In other words, except for the peripheral seal, the gap is the outer sheath-inner liner At the interface between the outer sheath and the inner liner in areas of the flexible pouch other than the peripheral seal The gaps or voids that exist at the outer sheath-inner liner interface between the without the need for a separate sheath, allowing movement and / or separation between the outer sheath and inner liner.

[0066] The flexible pouch has a structure between layers, an outer sheath / inner liner interface, and a peripheral sheath. The flexible liner only has adhesion at the liner / liner interface (compared to the welded joint). In a flexible pouch, the interface of the layers not disposed in the peripheral seal is free of adhesion. The void exists at the outer sheath / inner liner interface. The inner liner is not a peripheral seal. A gap or void exists between the inner liner and inner liner interface. Applicant believes that the gap is ) advantageously provides a barrier between the outer sheath and its respective inner liner; and (ii) It was also discovered that this contributes to the drop strength of the flexible pouch.

[0067] In one embodiment, each layer structure includes a printed film. The printed film is a PCR sheath. The printed film covers the PCR sheath. is the outermost layer of each layer structure and flexible pouch. When a printed film is provided, When a human looks at the flexible pouch or observes it in any other way, the PCR sheath is visible. Non-limiting examples of suitable materials for the print film include polyethylene terephthalate. Ethylene-based materials such as polyethylene terephthalate (PET), biaxially oriented polypropylene (BOPP), and HDPE Polymers are included.

[0068] If a printed film is provided, the peripheral seal of the flexible pouch is attached to the PCR sheath and In addition to the heel seal between each inner liner, the printed film and its respective The heat seal includes a heat seal between the first inner liner and the first PCR sheath. and a weld between the PCR sheath and the first printed film. The heat seal also forms a weld between the second inner liner and the second PCR sheath, and The second PCR sheath and the second printed film are welded together.

[0069] When a printed film is provided, the peripheral seal when viewed in cross section has the following layer structure: : First printing film / First PCR sheath / First inner liner / Second inner liner / second PCR sheath / second printed film, and " / " indicates the interface between the layers. It can be seen that a weld exists at the boundary surface " / ".

[0070] In one embodiment, the flexible pouch contains a food product within a storage compartment. The food product comes into direct contact with one or both of the outer sheaths. The food product does not come into contact with the outer sheath. - An interface gap between the PCR of the outer sheath and the food product in the storage compartment is added. The food product may be a solid and / or liquid substance. Non-limiting examples of liquid foodstuffs include industrial cleaning chemicals, industrial additives, solvents, liquid stones, Soap, or beverages, sauces, condiments (ketchup, mustard, mayonnaise), butter, Non-limiting examples of suitable solid food products include: Industrial granules, soap powder, salt crystals, or powdered sugar, grains, meat chunks, granulated solids, animal feed, and and food-related products such as pet food.

[0071] The present disclosure provides another flexible pouch. In one embodiment, the flexible pouch comprises a first and a second layer structure, each layer structure including a PCR layer, a foam layer, and a seal layer. The foam layer is disposed between the PCR layer and the sealing layer. The PCR layer is the outermost layer. The sealing layer is the innermost layer. The first layer structure and the second layer structure are such that the sealing layer is The first layer structure and the second layer structure are stacked on top of each other so as to face each other. The layer structure defines a common peripheral edge. The PCR has a GI200 value of greater than 50. Flexible The pouch includes a peripheral seal. The peripheral seal extends along at least a portion of the common peripheral edge. The peripheral seal seals the first layer structure to the second layer structure.

[0072] The foam layer can be a separate layer. Alternatively, the foam layer can be integrated into the PCR layer. do.

[0073] In one embodiment, the foam layer is comprised of foamed PCR. , may be the same as or different from the outermost PCR.

[0074] In one embodiment, each layer structure is formed by co-extrusion of the PCR, foam, and inner layer. When the layer structure is a co-extrusion structure with a foam layer, each layer structure has the following structure: Layer configuration: outer PCR / foam / inner liner, with " / " representing the layer interface.

[0075] In one embodiment, the foam layer is formed by co-extrusion with the outer PCR layer and the inner liner layer during the co-extrusion process. By utilizing or incorporating a blowing agent into the polymeric materials being co-extruded during Each layer structure is made up of the following layers: outer PCR / (in-situ) foam / It has an inner liner and the " / " indicates the interface of the layers.

[0076] By way of example, and not limitation, the following examples are provided for some embodiments of the present disclosure: This is explained in detail below in the examples. [Example]

[0077] The materials used in the examples are provided in Table 1 below. [Table 1]

[0078] A. Preparation of Inner Liner / Outer Sheath 1. Inner liner a. Inner liner structure - both outer layers are sealant layers, and the core layer is highly puncture resistant A polymeric three-layer multilayer film. Each A layer is made of AFFINITY 1146G. Sealant layer B is made of LLDPE INNATE ST50, 20 / A three-layer film with a layer structure A / B / A with a layer ratio of 60 / 20 was used as a conventional blow-through film. The total film thickness of the inner liner was 25 microns (1 mil). )

[0079] b. The process for manufacturing the inner liner is to use the Alpine 7-layer extrusion line. Layers 1 and 2 are 10% layers each containing AFFINITY 1146G, and layer 3, Layers 4 and 5 are 20% layers containing INNATE ST50, and layers 6 and 7 are 20% layers containing INNATE ST50, respectively. The 10% layer included AFFINITY 1146G.

[0080] 2.Outer sheath a.PCR outer sheath - monolayer film produced using a conventional blown film process In most cases, the polymer used was free of the formulation for the production of the desired film. The PCR pellet was dried using a desiccator.

[0081] b. Drying of PCR pellets - Approximately 50 lbs of PCR resin were each dried in a forced air oven. Conair Franklin "Closed Loop" Dehu, a Bun dryer The moisture was removed by placing it in a midifying dryer for over 12 hours. The drying air temperature was The temperature was set at 60°C (140°F). The dried PCR pellets were stored in a moisture-proof bag until use. The samples were stored in a refrigerator.

[0082] c. Process for producing the outer sheath - LabTech 5-layer blown film extrusion The line was used and all extruder feeds were filled with unmodified PCR pellets. The up-ratio is 2.5, and the final film thickness of each single-layer outer sheath is 150 microns. (6 mils).

[0083] B. Pouch manufacturing Cut the inner liner into a 28cm (11 inch) x 51cm (20 inch) rectangle. The outer sheath was cut into a rectangle measuring 28 cm (11 inches) x 51 cm (20 inches). The two inner liners and the two inner liners are placed together so that the sealing layers A of the inner liners face each other. The outer sheaths were stacked and arranged directly on top of each other in the following order shown in Structure A below: Thus, the inner liner / outer sheath are stacked and positioned to define a common peripheral edge. . Structural formula (A) i. Layer 1 (bottom layer) - outer sheath ii. Layer 2—Inner Liner Layer iii. Layer 3—Inner Liner Layer iv. Layer 4 (top layer) - outer sheath

[0084] Use Impulse Heat Sealer to seal the inner liner and outer seal of Structure A. The inner liner was sealed together to form a peripheral seal along the common peripheral edge. / Adjust the seal level by turning the dial until the outer sheath is sealed together without burning at the seal point. By forming a perimeter seal, Structure A was attached to the storage compartment along a common peripheral edge. The non-sealed portion is formed into a flexible pouch having a non-sealed area along a common peripheral edge. The area is an opening for introducing contents into the storage compartment.

[0085] C. Filling flexible pouches The flexible pouch was filled with water through the opening shown in Figure 1. Two inner sealant layers 5.5 kg of water was added to the flexible pouch so that water was added between the The design does not allow water to come into contact with the outer sheath at any point. After filling is complete, use a pressure sensitive adhesive. The flexible pouch was sealed with a perimeter seal and an opening seal. There is no adhesive contact between the inner liner and the outer sheath other than at the seal.

[0086] Before testing, the flexible pouches were inspected for leaks. Only leak-free pouches were exposed. was rated as.

[0087] D. Flexible Pouch Drop Test A Lansmont Bottle Drop Tester is used for drop testing. The Lansmont Bottle Drop Tester places flexible pouches The flexible pouch is equipped with a horizontal plate that allows it to remain in a horizontal position without the use of restraints. will hold its position.

[0088] The drop surface is a smooth metal surface. After each test, all water is removed from the metal surface. The actuator arm falls out from under the flexible pouch faster than the acceleration rate, causing the pouch to The flexible pouch was inspected after each drop. If any water leakage occurred, the flexible pouch was considered to be damaged.

[0089] E. Data Analysis To determine the usefulness of flexible pouches with structure A, the inner liner sealed to each other was A bag containing only the inner core was formed and tested by itself. The bag had the following structure B: do. Structure (B) i. Layer 1—Inner liner layer ii. Layer 2—Inner Liner Layer

[0090] Comparative Blank ID1 and Comparative Blank ID each had Structure B and were filled with water. The comparative blanks ID1 and ID2 were sealed flexible bags. The bag passed the drop test from a 0.91 meter drop. When the blanks were dropped from the container, the comparison blanks ID1 and ID2 were dropped twice each. also failed.

[0091] To determine the usefulness of flexible pouches having structure A, the outer seals were sealed together. A bag with only the outer sheath was formed and tested by itself. , having the following structure C: Structure (C) i. Layer 1 - Outer sheath layer ii. Layer 2 - Outer Sheath Layer

[0092] Comparative samples (CS) 1, 2, 3, and 4 use an outer sheath to achieve the same results as the flexible pouch. Bags having the dimensions were fabricated. Drop test results for all comparative samples are provided in Table 2 below. do. [Table 2]

[0093] The comparative blank samples 1 to 4 in Table 2 above had a 100% breakage rate after a 1.22 meter drop. Comparative blank samples 3 and 4 showed 100% failure at a 0.91 meter drop. Comparative samples (CS) 1-4 showed at least 50% failure rate at 1.22 meters. Ta.

[0094] The flexible pouches of invention examples (IE) 1, 2, 3, 4, and 5 have the same inner liner. The inner liner is shown in Table 1. The PCR resin of the outer sheath is each of IE1 to IE5. The drop test results for Examples 1, 2, 3, 4, and 5 are provided in Table 3 below. [Table 3]

[0095] From Table 2, each flexible pouch CS1 to CS4 has a 50% drop resistance in a 1.22 meter drop test. In Table 3, the breakage rates of IE1 to IE5, which are invention examples (IE), were 1.22 meters. IE4 to IE5 each passed the drop test from a height of 1.22 meters. It passes and also passes a subsequent drop test from 1.52 meters without any breakage / leaking.

[0096] The present disclosure is not limited to the embodiments and examples contained herein, but includes all parts of the embodiments, and variations of these embodiments, including combinations of elements of different embodiments. It is specifically intended that such inventions fall within the scope of the following claims.

Claims

1. A flexible pouch comprising: a first layer structure and a second layer structure, each layer structure comprising: (i) an inner liner; and (ii) an outer sheath; The first layer structure is arranged so that the inner liners face each other. and the first layer structure and the second layer structure define a common peripheral edge. 、 each inner liner (i) is made of a flexible film made of a polymeric material; Each outer sheath (ii) is made of post-consumer resin (PCR), a first layer structure and a second layer structure, wherein the PCR has a GI200 value of greater than 50; a peripheral seal along at least a portion of the common peripheral edge, a peripheral seal that seals the first layer structure to the second layer structure. Sex pouch.

2. 2. The method of claim 1, wherein the PCR has a GI200 value of 100 to 10,000. Flexible pouch.

3. 3. The method of claim 1, wherein the peripheral seal comprises a heat seal between opposing inner liners. The flexible pouch as described above.

4. Each layer structure comprises 10% to 90% by volume of the outer sheath, and 90% to 10% by volume of the outer sheath.

4. The flexible pouch according to claim 1, comprising the inner liner in an amount of 0.05 wt. % by volume.

5. The peripheral seal is a heat seal between the outer sheath and its respective inner liner. The flexible pouch of any one of claims 1 to 4, comprising:

6. The peripheral seal may include, in cross section, a first outer sheath, a first liner, a second liner, and a 6. The flexible pouch of claim 5, comprising a layer configuration of an inner, and a second outer sheath.

7. The peripheral seal is the outer sheath heat sealed to the first liner; the first liner heat sealed to the second liner; and 7. The flexible tube of claim 6, including the second liner heat sealed to the second sheath. Flexible pouch.

8. 10. The method of claim 1, wherein each inner liner is a flexible multi-layer film comprising at least three layers.

8. A flexible pouch according to any one of claims 1 to 7.

9. The flexible pouch according to any one of claims 1 to 8, wherein each layer structure comprises a printed film. blood.

10. The peripheral seal is the only seal between the inner liner and its respective outer sheath. The flexible pouch according to any one of claims 1 to 9, which is a roll.

11. an interface between said inner liner and its respective outer sheath; 11. The flexible seal of claim 10, wherein a gap exists at the interface except for the peripheral seal. Pouch.

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