Dimensionally stable flexible microwaveable package

Abstract

A microwaveable package includes a sidewall and a patch. The package includes a top portion and a bottom portion. The sidewall is a monopolymer-based film. The patch is a heat-resistant polymer-based film positioned in the bottom portion of the package and includes a thermal conductivity value of 0.11 to 0.44 Watts per meter per Kelvin (W / m K) at 25°C (77°F) when measured according to ASTM 1530-11.

Description

Technical Field

[0001] This disclosure relates to flexible microwaveable packaging that is dimensionally stable and resistant to heat, puncture, or contamination. The flexible microwaveable packaging is recyclable. Background Technology

[0002] Flexible microwaveable packaging typically includes stand-up pouches, four-seal bags, pillowcases, pouches, or small bags. The packaging contains microwaveable products, such as fresh or frozen foods, or non-food products such as pharmaceuticals. The packaging is usually made of laminated film, which includes oriented polyester film (OPET) or oriented polypropylene film (OPP) laminated onto a sealant film based on polyethylene (PE) or polypropylene (PP). The oriented film provides rigidity, print quality, and heat resistance to the laminate. Many countries lack the necessary recycling systems to recover these blended polymer laminates.

[0003] The pursuit of recycling has led to the development of monopolymer-based membranes and packaging. Monopolymer-based membranes are recyclable because all layers are made of the same type of polymer, which makes sorting easier and results in a cleaner recycling stream. Monopolymer-based membranes are typically made of polyethylene or polyethylene-based polymers.

[0004] Flexible, polyethylene, or microwaveable polyethylene-based packaging (i.e., monopolymer-based films) are easily exposed to high temperatures when the contents of the package are heated by microwave. Summary of the Invention

[0005] Flexible microwaveable packaging can be used to accommodate a wide range of products, including food and non-food items. When microwaving food products, uneven heating can occur, which may be due to factors such as product size, composition, density, or fat content. This can cause the flexible packaging material to become extremely warm or hot in certain areas. The high product temperature can cause the flexible packaging material to warp or deform. Packaging failures can also occur (e.g., film thinning, hole formation, film tearing, etc.), which may lead to product leakage from the packaging.

[0006] Polyethylene or polyethylene-based packaging films are recyclable. However, polyethylene or polyethylene-based packaging films may not be resistant to warping, deformation, or failure that can occur when products in packaging made from these films are microwaved. For example, the contents of packaging containing food products with a high fat content often reach temperatures higher than the glass transition temperature or melting point of the polyethylene or polyethylene-based film forming the packaging when microwaved according to the manufacturer's instructions.

[0007] Flexible packaging materials, including heat-resistant polymers such as polyamide or polypropylene, can resist warping, deformation, and failure. However, these polymers may not be recyclable in single-polymer recycling streams, such as polyethylene-based recycling streams.

[0008] This disclosure relates to flexible microwaveable packaging that can resist warping, deformation and failure and can also be recycled in a polyethylene-based recycling stream.

[0009] In one embodiment, the microwaveable package may include sidewalls comprising a membrane, the membrane including a first surface and a second surface. The package may include a patch comprising a membrane, the membrane including a first surface and a second surface. The package includes a seal attaching the sidewalls to itself. The package includes a top portion and a bottom portion. The sidewall membrane is a monopolymer-based membrane. The first surface of the sidewall is the exposed surface of the sidewall. The second surface of the sidewall is the sealant surface of the sidewall. The patch is a heat-resistant polymer-based membrane. The patch is positioned in the bottom portion of the package. The patch may include a thermal conductivity value of 0.11 W / m Kelvin (W / m·K) at 25°C (77°F) when measured according to ASTM 1530-11.

[0010] In another embodiment, the microwaveable package may include a first sidewall comprising a first sidewall film, the first sidewall film including a first exposed surface and a second sealant surface. The package may include a second sidewall comprising a second sidewall film, the second sidewall film including a second exposed surface and a second sealant surface. The package may include a patch comprising a film including a first surface and a second surface. The package may include a seal connecting the first sidewall to the second sidewall. The package includes a top portion and a bottom portion. The first sidewall film is a first monopolymer-based film. The second sidewall film is a second monopolymer-based film. The patch is a heat-resistant polymer-based film. The patch is positioned in the bottom portion of the package. The patch is attached to the first sidewall, the second sidewall, or a combination thereof. The patch includes a thermal conductivity value of 0.11 W / m Kelvin (W / m·K) to 0.44 W / m·K at 25°C (77°F) when measured according to ASTM 1530-11.

[0011] Other features that can be used individually or in combination with the implementation plan are as follows.

[0012] The first surface of the patch can be attached to the second surface of the sidewall.

[0013] The patch's second surface can be attached to the second surface of the sidewall.

[0014] The packaging can contain food products. Furthermore, the food products can be frozen food products.

[0015] Food products may contain 0.3% to 7% fat.

[0016] Membranes based on monopolymers can be polyethylene-based membranes.

[0017] Films based on heat-resistant polymers may include high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), polypropylene (PP), polyester (PET), polyamide (PA), or combinations thereof.

[0018] Films based on heat-resistant polymers may include high-density polyethylene, polypropylene, polyamide, or combinations thereof.

[0019] The patch can be positioned independently of the seal.

[0020] The packaging may include ventilation openings.

[0021] The patch can be positioned independently of the vent.

[0022] The packaging is suitable for recycling.

[0023] The total composition of the packaging may include between 90% and 99% by weight of a polyethylene-based polymer.

[0024] The packaging may include an additional patch positioned in the bottom of the packaging.

[0025] In another embodiment, the packaged product may include sidewalls, the sidewalls including a film, the film including a first surface and a second surface. The packaged product may include a patch, a seal, and a product, the patch including a film, the film including a first surface and a second surface. The seal joins to form the sidewalls of the package. The package includes a package body. The sidewall film is a film based on a single polymer. The first surface of the sidewall is the exposed surface of the sidewall. The second surface of the sidewall is the sealant surface of the sidewall. The patch is a film based on a heat-resistant polymer. The product is contained within the package body. The product may contain 0.3% to 7% fat content. When the package is in an upright position, the product is positioned within the portion of the package including the patch. The patch may include a thermal conductivity value of 0.11 W / m Kelvin (W / m·K) to 0.44 W / m·K at 25°C (77°F) when measured according to ASTM 1530-11.

[0026] Other features that can be used individually or in combination with the implementation plan are as follows.

[0027] The first surface of the patch can be attached to the second surface of the sidewall.

[0028] The patch's second surface can be attached to the second surface of the sidewall.

[0029] The packaging can contain food products. Furthermore, the food products can be frozen food products.

[0030] Food products may contain 0.3% to 7% fat.

[0031] Membranes based on monopolymers can be polyethylene-based membranes.

[0032] Films based on heat-resistant polymers may include high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), polypropylene (PP), polyester (PET), polyamide (PA), or combinations thereof.

[0033] Films based on heat-resistant polymers may include high-density polyethylene, polypropylene, polyamide, or combinations thereof.

[0034] The patch can be positioned independently of the seal.

[0035] The packaging may include ventilation openings.

[0036] The patch can be positioned independently of the vent.

[0037] The packaging is suitable for recycling.

[0038] The total composition of the packaging may include between 90% and 99% by weight of a polyethylene-based polymer.

[0039] The packaging may include an additional patch positioned in the bottom of the packaging. Attached Figure Description

[0040] This disclosure will be more fully understood by considering the following detailed description of various embodiments of the disclosure in conjunction with the accompanying drawings, in which:

[0041] Figure 1 A schematic cross-sectional view illustrating one embodiment of a monolayer polymer-based membrane is shown.

[0042] Figure 2 A schematic cross-sectional view illustrating one embodiment of a multilayer monopolymer-based membrane is shown.

[0043] Figure 3 A schematic cross-sectional view illustrating one embodiment of a multilayer monopolymer-based membrane is shown.

[0044] Figure 4 A schematic cross-sectional view illustrating one embodiment of a multilayer monopolymer-based membrane is shown.

[0045] Figure 5 A schematic cross-sectional view illustrating one embodiment of a multilayer monopolymer-based membrane is shown.

[0046] Figure 6 A schematic cross-sectional view illustrating one embodiment of a multilayer monopolymer-based membrane is shown.

[0047] Figure 7 A schematic perspective view illustrating one implementation scheme of the packaging;

[0048] Figure 8 It indicated Figure 7 A schematic cross-sectional view of one embodiment of the packaging is shown in the figure;

[0049] Figure 9 A schematic perspective view illustrating one implementation scheme of the packaged product;

[0050] Figure 10 It indicated Figure 9 A schematic cross-sectional view of the packaged product shown in the image;

[0051] Figure 11 A schematic perspective view illustrating one implementation scheme of the packaging;

[0052] Figure 12 It indicated Figure 11 A schematic cross-sectional view of one embodiment of the packaging is shown in the figure; and

[0053] Figure 13 A graph illustrating the thermal strain (%) data of embodiments of films based on heat-resistant polymers and films based on monopolymers is shown.

[0054] The accompanying drawings illustrate some, but not all, of the embodiments. The elements depicted in the drawings are illustrative and not necessarily drawn to scale, and throughout the drawings, the same (or similar) reference numerals denote the same (or similar) features. Detailed Implementation

[0055] This article describes a dimensionally stable, potentially heat-, puncture-, or stain-resistant flexible microwaveable packaging. The flexible microwaveable packaging is also recyclable. The microwaveable packaging includes sidewalls formed from a flexible film based on a single polymer. The microwaveable packaging includes patches that provide dimensional stability to the packaging.

[0056] Suitable products that can be contained in the flexible microwaveable packaging may include, but are not limited to, fresh foods, refrigerated foods, frozen foods, shelf-stable foods, pharmaceuticals, nutritional supplements, medical products, consumer products, cosmetics, and chemicals. Many products, such as food products, may contain 0% to 100% by weight of fat per serving (e.g., a serving size). As used herein, the term "fat content" refers to the total weight of fat contained in each serving of product and is expressed as a percentage of the product's weight. Total fat refers to the sum of saturated fat, trans fat, monounsaturated fat, and polyunsaturated fat in a single serving of product. For example, nutrition labels on packaged food products in the United States include total fat content expressed in grams per serving size. Total fat information expressed in grams per serving size can be used to determine fat content, as used herein, i.e., a percentage by weight of a single serving of product. 0% fat content means that the product contains no fat at all, while 100% fat content means that the product consists entirely of fat. In one embodiment, the fat content of a product can be any percentage between 0% and 100% by weight or in between for a given serving size of product. In other embodiments where the product is a food product, the fat content can be any percentage of 0.1% to 30% by weight, 0.2% to 20% by weight, 0.3% to 10% by weight, or between, of a given portion of the food product. In other embodiments, the fat content can be any percentage of 0.3% to 7% by weight, or between, of a given portion of the product.

[0057] Food products may include fresh foods such as dairy products (e.g., milk, cheese, etc.), vegetables, and proteins such as beef, pork, poultry, fish, or seafood, or frozen foods such as dairy products, vegetables, and proteins. In some cases, frozen food products may be combinations of food products. Non-limiting examples of frozen food products include frozen dairy products and vegetables (e.g., frozen broccoli and cheese sauce) and frozen proteins and vegetables (e.g., frozen beef appetizers, mixed vegetables, and gravy / sauce).

[0058] Membranes based on monopolymers

[0059] As used herein, "monopolymer-based membrane" refers to a membrane that is primarily composed of a single polymer class (i.e., a monopolymer). Examples of monopolymers include polyethylene, polypropylene, polyamide, etc. The monopolymer does not necessarily refer to the number of layers contained in a monopolymer-based membrane. Monopolymer-based membranes can be produced by monoextrusion or coextrusion or via lamination of multiple membranes comprising the same single polymer class. As used herein, the term "monopolymer-based" refers to articles (i.e., packaging, films, layers, etc.) containing a high level of monopolymer. In some cases, monopolymer-based articles contain at least 50% monopolymer. In other cases, monopolymer-based articles contain at least 50% polyethylene-based polymers.

[0060] In some embodiments, the monopolymer-based membrane may comprise a single polymer suitable for monopolymer recovery streams. In such embodiments, the total amount of the monopolymer should be at a high level, and any additives used should be kept to a minimum. The presence of any non-monopolymers should be minimized. In these embodiments, the total composition of the monopolymer-based membrane may comprise 90% to 100% by weight of a single polymer, including any range or combination thereof. In some embodiments, the total composition of the monopolymer-based membrane comprises more than 90% by weight or more than 95% by weight of a single polymer. In one embodiment, the single polymer is present in an amount of 95% to 100% by weight of the monopolymer-based membrane.

[0061] As used herein, the term "polyethylene-based" refers to articles (i.e., packaging, films, layers, etc.) containing a high level of polyethylene-based polymers. In some cases, polyethylene-based articles have at least 50% by weight of polyethylene-based polymers. Polyethylene-based articles may have at least 60% by weight, at least 70% by weight, at least 80% by weight, at least 90% by weight, at least 95% by weight, or any range or combination thereof of polyethylene-based polymers. In some cases, polyethylene-based articles consist entirely of polyethylene-based polymers. Articles may contain other minor components, such as slip agents, anti-blocking agents, processing aids, nucleating additives, or hydrocarbon additives.

[0062] As used herein, the term "polyethylene-based polymer" refers to a polymer having ethylene bonds and maintaining a glass transition temperature below 50°C. The polymer can be a homopolymer of ethylene or a copolymer of ethylene with other monomers. Examples of polyethylene-based polymers include, but are not limited to, low-density polyethylene (LDPE), high-density polyethylene (HDPE), linear low-density polyethylene (LLPDE), metallocene-catalyzed linear low-density polyethylene (mLLDPE), ethylene-vinyl acetate copolymer (EVA), cyclic olefin copolymer (COC), and maleic anhydride-grafted polyethylene (MAH-PE). As used herein, "polyethylene-based polymer" does not cover ethylene-vinyl alcohol copolymers (i.e., EVOH, saponified or hydrolyzed ethylene-vinyl acetate copolymers, or ethylene alcohol copolymers having ethylene comonomers). For example, EVOH may be used to increase gas barrier properties if required for a particular packaging application. EVOH is not considered a polyethylene-based polymer as described herein because it may cause problems in polyethylene-based recycled streams. In one embodiment, the total composition of a monopolymer-based membrane may include 0% to 5% by weight of an ethylene-vinyl alcohol copolymer. In another embodiment, the total composition of the monopolymer-based membrane may include 0% to 10% by weight of ethylene vinyl alcohol copolymer.

[0063] In some cases, articles based on a single polymer include articles rich in polyethylene. As used herein, the term "rich in polyethylene" refers to an article containing a very high level of polyethylene-based polymer (i.e., packaging, films, layers, etc.). In some cases, articles rich in polyethylene have at least 90% by weight of polyethylene-based polymer. For example, articles rich in polyethylene may have at least 92% by weight, at least 94% by weight, at least 96% by weight, at least 98% by weight, 100% by weight, or any range or combination thereof of polyethylene-based polymer. In some cases, articles rich in polyethylene are composed of polyethylene-based polymer.

[0064] Membranes based on a single polymer can be single-layer or multi-layer membranes. As used herein, the term "membrane" refers to a single-layer or multi-layer web having a negligible z-direction dimension (thickness) compared to its x- and y-direction dimensions (length and width). A membrane is generally considered to have two main surfaces opposing each other, extending in the length and width directions. The surfaces of the membrane not attached to another layer or membrane are the exposed surfaces of the membrane. Membranes can be constructed from an unlimited number of membranes or layers bonded together to form multilayer membranes. Reference Figure 1 The diagram illustrates a monolayer polymer-based membrane 1. The monolayer polymer-based membrane 1 includes a first surface 3 and a second surface 5. The first surface includes an exposed surface of the polymer-based membrane 1. The second surface 5 includes the exposed surface of the polymer-based membrane 1. The second surface may include a sealant surface of the monolayer polymer-based membrane. In one embodiment, the monolayer polymer-based membrane comprises a polyethylene-based polymer.

[0065] refer to Figure 2-3 This illustrates a multilayered membrane based on a single polymer. As used herein, the term "multilayer" refers to a single membrane structure that may have multiple layers bonded together by any known means known in the art (i.e., co-extrusion, lamination, coating, or a combination thereof), these layers typically in the form of sheets or webs, and may be made of polymeric or non-polymeric materials. The layers of the structure can be created and combined via a multilayer co-extrusion process. All, some, or none of these layers may be combined via co-extrusion. Layers and materials can be added to the membrane structure by means of adhesive lamination, extrusion coating, vacuum metallization, solution coating, printing, or other known processes.

[0066] refer to Figure 2The polymer-based membrane 10 comprises a first sheet or web for a first membrane 12, laminated to a second sheet or web for a second membrane 14. The first membrane 12 includes a first surface 13 and a second surface 15, the first surface including the exposed surface of the polymer-based membrane 10. The second membrane 14 includes a first surface 17 and a second surface 19, the second surface including the exposed surface of the polymer-based membrane 10. For example, the first membrane 12 and the second membrane 14 are joined by a laminate 16 comprising an adhesive or a polyethylene extrusion laminator. In one embodiment, the first membrane comprises a polyethylene-based polymer. In one embodiment, the second membrane comprises a polyethylene-based polymer. In one embodiment, both the first and second membranes comprise a polyethylene-based polymer.

[0067] The second membrane may be a sealant membrane. A "sealant membrane" has at least one exposed sealant surface that can be sealed (e.g., sealed, joined, adhered, attached, etc.) to itself or another membrane to form a seal. That is, the exposed sealant surface softens upon exposure to heat and returns to its original state upon cooling to room temperature. In some cases, the seal is hermetically tight. For example, the second surface 19 of the second membrane 14 may include a sealant surface.

[0068] As used herein, the term "layer" refers to a building block of a membrane, which is a structure of a homogeneous blend of a single polymer or material. Layers may contain other non-polymer materials and may have additives. Layers may be continuous or discontinuous (i.e., patterned), having the length and width of a membrane. In monolayer membranes, "membrane," "sheet," and "layer" are synonymous.

[0069] In some embodiments, the first film may be an oriented film, such as an oriented polyethylene film. As used herein, the term "oriented" refers to a film, sheet, web, etc., that is elongated in at least one direction, either longitudinally or transversely. This elongation is achieved by processes known in the art. Non-limiting examples of such processes include single-bubble blown film extrusion and slot-cast sheet extrusion followed by stretching (e.g., by stretching) to provide orientation. Longitudinal orientation can be achieved by using rolls rotating at different speeds, or by pulling or stretching the film tube longitudinally. In some embodiments, the first film is oriented for the aesthetics, rigidity, or abuse resistance of the packaging produced from the monopolymer-based film.

[0070] The first membrane 12 and the second membrane 14 each have Figure 2 The image shows a single-layer film. In some embodiments, the first and second films may each be multilayer co-extruded films. In other embodiments, the first film may be a multilayer film and the second film may be a single-layer film. In still other embodiments, the first film may be a single-layer film and the second film may be a multilayer film, for example, as shown in the image. Figure 3 As shown in the diagram. A multilayer film may include as many layers as desired, but shall include at least two layers. Reference Figure 3 The second membrane 14 is shown as a multilayer membrane, comprising a first co-extruded layer 2, a second co-extruded layer 4, and a third co-extruded layer 6. Layer 6 may include the sealant surface of a co-extruded monopolymer-based membrane.

[0071] In some embodiments, the first film, the second film, or both the first film and the second film are blown films. As used herein, the term "blown film" refers to a film produced by a blown co-extrusion process. In a blown co-extrusion process, a stream of melt plasticized polymer is forced through an annular die having a central mandrel to form a tubular extrudate. The tubular extrudate can be expanded to a desired wall thickness by a volume of fluid (e.g., air or other gas) entering the hollow interior of the extrudate via the mandrel, and then rapidly cooled or quenched by any of a variety of methods known to those skilled in the art.

[0072] In some other embodiments, at least one additional layer may be positioned between the first membrane and the second membrane. (Reference) Figure 4 The diagram illustrates a monopolymer-based membrane 20 comprising a first membrane 22, a second membrane 24, a laminate 26, and a first additional layer 28. The first membrane 22 includes a first surface 23 and a second surface 25, the first surface comprising the exposed surface of the monopolymer-based membrane 20. The second membrane 24 includes a first surface 27 and a second surface 29, the second surface comprising the exposed surface of the monopolymer-based membrane 20. The first membrane 22 and the second membrane 24 are connected by the laminate 26. For example, the first additional layer 28 may be a printing layer, an ink layer, a primer layer, a coating layer, or an oxide coating. The first additional layer 28 may be continuous or discontinuous. In one embodiment, the first membrane comprises a polyethylene-based polymer. In one embodiment, the second membrane comprises a polyethylene-based polymer. In one embodiment, both the first and second membranes comprise a polyethylene-based polymer.

[0073] In other embodiments, the first additional layer may be positioned on a first surface of a first membrane based on a monopolymer. (See reference) Figure 5 The diagram illustrates a monopolymer-based membrane 30, comprising a first membrane 32, a second membrane 34, a laminate 36, and a first additional layer 38. The first membrane 32 includes a first surface 33 and a second surface 35. The second membrane 34 includes a first surface 37 and a second surface 39, the second surface comprising the exposed surface of the monopolymer-based membrane 30. The first membrane 32 and the second membrane 34 are connected by the laminate 36. The first additional layer 38 is shown positioned on the first surface 33 of the first membrane 32. In this embodiment, the first additional layer 38 is the exposed surface of the monopolymer-based membrane 30. In one embodiment, the first membrane comprises a polyethylene-based polymer. In one embodiment, the second membrane comprises a polyethylene-based polymer. In one embodiment, both the first and second membranes comprise a polyethylene-based polymer.

[0074] In one embodiment, in addition to the first additional layer, the monopolymer-based film may also include multiple additional layers. That is, a second additional layer, a third additional layer, etc. The additional layers may be continuous or discontinuous. The additional layers may differ in composition. The additional layers may be located between the first and second films and / or on the exterior of the first surface of the first film. As many additional layers as desired can be used in the final film structure, as long as it conforms to the spirit of the embodiments disclosed herein, i.e., including a monopolymer-based film and a package that provides dimensional stability and integrity.

[0075] The first membrane may have a thickness of 10 micrometers to 100 micrometers, preferably 20 micrometers to 50 micrometers. The second membrane may have a thickness of 10 micrometers to 100 micrometers, preferably 20 micrometers to 50 micrometers. The membrane based on the monopolymer may have a thickness of 20 micrometers to 200 micrometers, preferably 40 micrometers to 100 micrometers.

[0076] In other embodiments, the monopolymer-based film can be a multilayer co-extruded film. (See reference) Figure 6 The illustration shows a monopolymer-based membrane 40 comprising a first layer 42, a second layer 44, and a binding layer 46. In one embodiment, the first layer comprises a polyethylene-based polymer. In one embodiment, the second layer comprises a polyethylene-based polymer. In one embodiment, both the first and second layers comprise a polyethylene-based polymer.

[0077] Binding layer 46 may provide adhesion (i.e., adhesive or binding material) between first layer 42 and second layer 44. As used herein, the terms “binding material,” “polymer adhesive layer,” “adhesive layer,” or “binding layer” refer to a polymeric material whose primary purpose or function is to bond two surfaces (typically planar surfaces of two film layers) to each other. Binding material bonds one film layer surface to another film layer surface. Binding material may include any polymer, copolymer, or polymer blend having polar groups, or any other polymer, homopolymer, copolymer, or polymer blend that provides sufficient interlayer adhesion to adjacent layers containing otherwise non-adhesive polymers, including modified and unmodified polymers (such as graft copolymers). In some embodiments, a laminated layer is not included. The second layer may be a sealing layer. In other embodiments, the monopolymer-based film may be co-extruded to include a polyethylene-based supplementary layer. In other embodiments, the monopolymer-based film may include additional layers such as printing layers, ink layers, coating layers, etc. Co-extruded multilayer monopolymer-based films may have a thickness of 10 micrometers to 100 micrometers, preferably 20 micrometers to 50 micrometers.

[0078] Membranes based on heat-resistant polymers

[0079] The heat-resistant polymer-based membrane can be a single-layer or multi-layer membrane. It can include laminated membranes, co-extruded membranes, or combinations thereof. In some embodiments, the heat-resistant polymer-based membrane can be based on a single polymer. In other embodiments, the heat-resistant polymer-based membrane is a polyethylene-based membrane, and in some other embodiments, it is a polyethylene-rich membrane. In some embodiments, the heat-resistant polymer-based membrane includes HDPE, LDPE, LLDPE, polypropylene (PP), polyester (polyethylene terephthalate PET), polyamide (e.g., PA6, PA6,6, PA12, etc.), or combinations thereof. In one embodiment, the heat-resistant polymer-based membrane includes HDPE, polyamide, PP, or combinations thereof.

[0080] As used throughout this application, the terms "polypropylene" or "PP" refer to a plastic, homopolymer, or copolymer having at least one propylene monomer bond within the repeating backbone of the polymer. A propylene bond can be represented by the following general formula: [CH2CH(CH3)] n Such polypropylene can be a polypropylene impact copolymer, a polypropylene random copolymer, or a polypropylene homopolymer; it can be syndiotactic or isotactic; and it may or may not be clarified.

[0081] As used herein, the term "polyester" refers to homopolymers and copolymers having recurring ester bonds, which can be formed by any method known in the art. The recurring ester bonds can be formed by reacting one or more diols with one or more diacids. Non-limiting examples of suitable diols include ethylene glycol, diethylene glycol, 1,3-propanediol, 1,4-butanediol, resorcinol, 1,4-cyclohexanediol, 2,2,4,4-tetramethyl-1,3-cyclobutanediol, and polyoxytetramethylene glycol. Non-limiting examples of suitable diacids include terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, 2,5-furandicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, trimellitic anhydride, succinic acid, adipic acid, and azelaic acid.

[0082] Non-limiting examples of suitable polyesters include polyethylene terephthalate (PET), poly(ethylene terephthalate-co-cyclohexanediol terephthalate) (PETG), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polyethylene furfurylate (PEF), polypropylene furfurylate (PPF), and poly(butylene adipate-co-terephthalate) (PBAT).

[0083] Suitable polyesters can also be formed by the ring-opening polymerization of suitable cyclic monomers, such as lactide to form, for example, polylactic acid (PLA); glycolide to form, for example, polyglycolic acid (PGA); and lactones to form, for example, polycaprolactone and polybutyrolactone.

[0084] Suitable polyesters can also be formed through the direct condensation reaction of α-hydroxy acids. For example, PGA can be formed through the condensation reaction of glycolic acid.

[0085] Suitable polyesters can also be synthesized by microorganisms. Examples of suitable polyesters include various polyhydroxyalkanoates, such as polyhydroxybutyrate (PHB) and polyhydroxyvalerate (PHV).

[0086] As used throughout this application, the terms "polyamide," "PA," or "nylon" refer to homopolymers or copolymers having amide bonds between monomer units and formed by any method known in the art. Recurring amide bonds can be formed by reacting one or more diamines with one or more diacids. Non-limiting examples of suitable diamines include 1,4-diaminobutane, hexamethylenediamine, decamethyldiamine, m-xylylenediamine, and isophoronediamine. Non-limiting examples of suitable diacids include terephthalic acid, isophthalic acid, 2,5-furandicarboxylic acid, succinic acid, adipic acid, azelaic acid, decanoic acid, and lauric acid.

[0087] Polyamides can also be formed by the ring-opening polymerization of suitable cyclic lactams such as ε-caprolactam, ω-undecaprolactam and ω-dodecanolactam.

[0088] Non-limiting examples of suitable polyamides include poly(ε-caprolactam) (Nylon 6), poly(ω-undecaprolactam) (Nylon 11), poly(ω-dodecanolactam) (Nylon 12), poly(hexamethylene adipamide) (Nylon 6,6), poly(hexamethylene adipamide-co-caprolactam) (Nylon 66 / 6), poly(caprolactam-co-hexamethylene adipamide) (Nylon 6 / 66), poly(caprolactam-co-hexamethylene nonadiamide) (Nylon 6 / 69), poly(m-xylyl adipamide) (MXD6), and poly(hexamethylene terephthalamide-co-hexamethylene isophthalamide) (Nylon 6I / 6T).

[0089] Films based on heat-resistant polymers can withstand thermal effects. These films are dimensionally stable; that is, they will not shrink or otherwise deform (e.g., wrinkle, bubble, form holes, stretch, etc.) when exposed to the temperatures of microwave cooking conditions. Microwave cooking conditions can include, for example, temperatures exceeding 93°C (200°F), 107°C (225°F), 121°C (250°F), 135°C (275°F), 149°C (300°F), 177°C (350°F), 204°C (400°F), or any temperatures in between.

[0090] Dimensional stability can be characterized and quantified by analyzing the stretching of a film at high temperatures. In the development of the flexible microwaveable packaging disclosed herein, the inventors discovered that the dimensional stability of a film can be characterized by a property defined as "thermal strain value." The thermal strain value is a useful measure for predicting the heat resistance of heat-resistant polymer-based films suitable for use in dimensionally stable flexible microwaveable packaging.

[0091] The thermal strain value of films based on heat-resistant polymers can be less than 0.5% at temperatures below 120°C. The difference in thermal strain value between films based on heat-resistant polymers and films based on monopolymers can be between 0% and 1.0% at 80°C, between 0% and 2.0% at 100°C, and between 0% and 4.0% at 120°C.

[0092] The heat-resistant polymer-based film also includes a thermal conductivity value, which is a material property describing its thermal conductivity. As used throughout this application, the term "thermal conductivity" refers to the amount of heat transferred per unit thickness of a heat-resistant polymer-based film in a direction perpendicular to a unit area surface due to a unit temperature gradient under steady-state conditions. In other words, thermal conductivity is a measure of the heat flow of a material and represents the material's resistance to heat transfer. Thermal conductivity values ​​are directly proportional to the material's insulating behavior. That is, a relatively high thermal conductivity value represents very good thermal conductivity and almost no insulating behavior, while a relatively low thermal conductivity value represents poor thermal conductivity and insulating behavior. As used throughout this application, the term "non-insulating" refers to a thermal conductivity value representing good thermal conductivity and minimal to no insulating behavior.

[0093] The heat-resistant polymer-based membranes disclosed herein include thermal conductivity values ​​ranging from 0.11 W / m·K (W / m·K) to 0.44 W / m·K at 25°C (77°F) when measured according to ASTM 1530-11. Thermal conductivity values ​​can be any range or combination of ranges from 0.11 W / m·K to 0.44 W / m·K, 0.22 W / m·K, 0.33 W / m·K, 0.44 W / m·K, or between. Heat-resistant polymer-based membranes with thermal conductivity values ​​within this range will transfer heat, making them non-insulating. In one embodiment, a heat-resistant polymer-based membrane comprising polyamide may include a thermal conductivity value of 0.25 W / m·K. In another embodiment, a heat-resistant polymer-based membrane comprising high-density polyethylene may include a thermal conductivity value from 0.42 W / m·K to 0.44 W / m·K. In another embodiment, the heat-resistant polymer-based film comprising low-density polyethylene may have a thermal conductivity value of 0.33 W / m·K. In yet another embodiment, the heat-resistant polymer-based film comprising polypropylene may have a thermal conductivity value of 0.11 W / m·K to 0.22 W / m·K.

[0094] For comparison, insulation materials may include thermal conductivity values ​​of 0.08 W / m·K or less. Common insulation materials (i.e., bubble wrap) having multiple air-filled cavities disposed between thermoplastic sheets or films include thermal conductivity values ​​of 0.027 W / m·K or less. In some cases, the thermal conductivity values ​​of the insulation materials differ significantly from those of the heat-resistant polymer-based films of this disclosure by at least one order of magnitude. The heat-resistant polymer-based films of this disclosure are not thermally insulating. Furthermore, the heat-resistant polymer-based films of this disclosure do not include air-filled cavities disposed between or within the films (i.e., foam films).

[0095] Furthermore, the film based on heat-resistant polymers is transparent to microwave energy. In other words, the film based on heat-resistant polymers will not react to microwave energy as known in the field of microwaveable packaging sensors (i.e., absorb or reflect it).

[0096] Package

[0097] Flexible microwaveable packaging may warp, deform, or fail when exposed to temperatures above the glass transition temperature or melting point of the monopolymer-based film (e.g., polyethylene or polyethylene-based film) forming the sidewalls of the packaging. Warping, deformation, or failure of the packaging film (e.g., stretching, bubbling, wrinkling, holes, thinning, etc.) can affect packaging integrity, negatively impacting packaging stability. The packaging may fail to stand upright or lie flat as intended, or may make it difficult for the end user to grip or hold it (e.g., the packaging tipps over or collapses onto itself, holes form in the packaging, etc.). Furthermore, warping or deformation of the packaging film can affect the packaging appearance, including graphics, printing, or instructions for use, making them distorted, unreadable, or unattractive. Additionally, holes may allow product leakage, potentially posing a burn hazard to consumers or causing consumer frustration with the mess created in the microwave. Flexible microwaveable packaging may include film patches based on heat-resistant polymers that help the packaging resist warping, deformation, or failure.

[0098] The packaging disclosed herein is not limited to stand-up pouches, four-seal bags, pillowcases, pouches, or sachets. The packaging comprises sidewalls of a monopolymer-based film and a patch of a heat-resistant polymer-based film. The sidewalls incorporate the properties of the monopolymer-based film, and the patch incorporates the properties of the heat-resistant polymer-based film, as previously described. The sidewalls are sealed by a sealant to form a packaging body capable of containing products that can be any type of consumer or industrial article, medical product, pharmaceutical article, food article, or non-food article.

[0099] The packaging includes a top portion, a bottom portion, a height, and a width. The bottom portion of the packaging is opposite to the top portion and corresponds to the portion of the packaging that rests on a shelf or surface when the packaging is in an upright manner (e.g., in an upright position). For example, the bottom portion includes the portion of the packaging at the bottom, because in normal use the packaging typically sits on a table or surface (e.g., the product rests against the bottom of the packaging due to gravity, and packaging graphics or instructions (if included) are displayed in a readable manner as intended). The packaging includes a horizontal center line parallel to the surface on which the packaging can rest when placed upright. The horizontal center line is located at half the height of the packaging. The horizontal center line divides the packaging into a top portion and a bottom portion, such that the top portion includes 50% of the packaging above the horizontal center line and the bottom portion includes 50% of the packaging below the horizontal center line.

[0100] The packaging may include ventilation features that allow air to move from inside the packaging body to the external environment. Ventilation features may be useful when cooking products contained in the packaging, for example, to allow steam to escape from the packaging. Ventilation features may include, for example, perforations, micro-perforations, slits, or small holes in the panel, or tortuous paths formed in the seal.

[0101] Packaging can be manufactured with additional features or components such as tear lines, tear notches, and mechanical closures (e.g., hooks and loops, snaps, zippers). These features facilitate easy opening of the packaging and reclosing it after the initial opening.

[0102] The patch is positioned in the bottom portion of the package. The patch may comprise 20% to 100% of the bottom portion or any range or combination thereof. The patch includes a first surface and a second surface corresponding to the first and second surfaces of the previously described heat-polymer-based film. The first or second surface of the patch may be attached (e.g., bonded) to a sidewall comprising a monopolymer-based film. In some embodiments, the patch may be positioned on a sidewall comprising the first surface (exposed surface) of the monopolymer-based film. In other embodiments, the patch may be positioned on a sidewall comprising the second surface (sealant surface) of the monopolymer-based film. In some embodiments, the first surface of the patch comprising the heat-polymer-based film may be attached to a sidewall comprising the second surface of the monopolymer-based film. In some other embodiments, the second surface of the patch comprising the heat-polymer-based film may be attached to a sidewall comprising the second surface of the monopolymer-based film. The patch may be positioned independently of a seal forming (e.g., closing) the package. The patch may be positioned independently of any ventilation features. The patch can be attached to a single polymer-based film by means of an adhesive, such as a cut and placed film laminate or a die-cut label, or any other means known to those skilled in the art.

[0103] Packaging may include additional patches. For example, a first additional patch, a second additional patch, etc. For packaging that includes multiple patches, the combination of patches includes: the patch comprising a film based on a heat-resistant polymer, the patch being positioned in the bottom portion of the packaging, and all other requirements for a single patch as described above.

[0104] exist Figure 7 and Figure 8 In one non-limiting embodiment shown, package 50 is made of a monopolymer-based film that forms sidewalls 52, including an exposed surface 51 and a sealant surface 53. Package 50 can be formed by a molding-filling-sealing process or by a bagging process known in the art. Figure 8 It indicated Figure 7 The cross-section of package 50 is shown. Package 50 is a stand-up pouch with a seal 54 that seals the sidewalls 52 at or near their edges, thereby forming a package body 55 capable of containing a product. Package 50 includes a ventilation feature 56, shown as a series of perforations. Package 50 includes a height h, a width w, and a horizontal centerline c. Package 50 also includes a patch 58 comprising a film based on a heat-resistant polymer. Patch 58 is positioned below the horizontal centerline c in the bottom portion 60 of package 50. Package 50 includes a top portion 61. Patch 58 is shown as comprising approximately 100% of the bottom portion 60. Patch 58 is attached to the sealant surface 53 of the sidewalls 52 formed from a monopolymer-based film.

[0105] Figure 9 and Figure 10 It illustrates a package containing product 65, such as food product 50.

[0106] exist Figure 11 and Figure 12 In another non-limiting embodiment shown, the package 90 is made of a first sidewall 92 formed of a first monopolymer-based film and a second sidewall 99 formed of a second monopolymer-based film. Figure 12 It indicated Figure 11The diagram shows a cross-section of package 90. In some embodiments, the first and second monopolymer-based films may comprise the same composition or structure. In other embodiments, the first and second monopolymer-based films may differ in composition or structure. The first sidewall 92 includes an exposed surface 91 and a sealant surface 93. The second sidewall film 99 includes an exposed surface 91' and a sealant surface 93'. Package 90 is a pillow-shaped bag with a seal 94 that seals the first sidewall 92 to the second sidewall 99 at or near its respective edge, thereby forming a package body 95 capable of containing a product. Package 90 includes a height h, a width w, and a horizontal centerline c. Package 90 also includes a patch 98 comprising a film based on a heat-resistant polymer. Patch 98 is positioned below the horizontal centerline c in the bottom portion 100 of package 90. Package 90 includes a top portion 101. Patch 98 is attached to the sealant surface 93' of the second monopolymer-based film 99. Patch 98 is shown as approximately 100% including the bottom portion 100.

[0107] Patches can provide heat resistance to packaging. For example, a polyethylene-based sidewall package without patches containing products containing fat may become very warm or hot when exposed to microwave energy, allowing fat to migrate into the sidewall film, leading to warping, deformation, or failure of the film. Polyethylene-based sidewall packages with patches containing products containing fat may also become very warm or hot when exposed to microwave energy. However, the patches prevent fat migration into the sidewall film and thus provide heat resistance, preventing or minimizing warping, deformation, or failure of the sidewall film. Patches can also provide puncture resistance or stain resistance to packaging.

[0108] As previously stated, patches are not heat-insulating. For example, the temperature of the portion of packaging containing the patch may exceed 60°C (140℉). According to ASTM C1055-20 (“Standard Guideline on Surface Conditions of Heated Systems that Cause Contact Burns”), temperatures above 60°C can cause irreversible damage to human epidermis (i.e., human skin) with contact time of 5 seconds or longer. In other words, when exposed to microwave energy, packaging containing patches may reach temperatures exceeding the level of reversible damage in the portion of the packaging containing the patch. When packaging contains a product with a low fat content (e.g., 7% or less) and is exposed to microwave energy, temperatures exceeding the reversible damage threshold may be reached.

[0109] Recyclable packaging

[0110] The packaging disclosed herein is suitable for recycling. As used herein, the terms "suitable for recycling" and "recyclable" refer to the treatment or processing of used material to make it suitable for reuse. In some cases, recyclable is intended to reflect that the material can be readily handled in recycling processes that accept "all-polyethylene" or "all-polyolefin" articles. In other cases, recyclable is intended to reflect that the material conforms to recycling content standards established by an organization (e.g., the Plastics Recycling Association or Recycled Materials Standards). Typically, these recycling processes can accept low levels of certain contaminants. Therefore, recyclable further reflects that the packaging film has a very high level of polyethylene and a low level of acceptable contaminants. The recyclability of the packaging film is defined by the total composition, as determined by the weight of the material. As described herein, the "total composition" of the packaging refers to all components and materials, including sidewalls, patches, zippers, and any other additional components. The total composition of the packaging may include between 90% and 99% by weight of a polyethylene-based polymer. In some embodiments, the total composition of the packaging includes more than 90% by weight or more than 95% by weight of a polyethylene-based polymer. In some other embodiments, the packaging may comprise a total composition containing at least 95% by weight of a polyethylene-based polymer.

[0111] In some embodiments where the heat-resistant polymer-based film in which the patch is formed does not contain more than 90% by weight of polyethylene-based polymer, the patch can be removed from the packaging (e.g., peeled off or cut off if applied as an adhesive label) and the patch and sidewall material can be placed in the appropriate waste and recycling stream.

[0112] Test methods

[0113] Microwave Cooking: Prepare the package and fill it with 284g (10oz) of frozen broccoli and frozen cheese sauce. The fat content of the frozen broccoli and cheese product is approximately 2% per 106g serving. Expose the filled package to microwave energy in a 1,000W microwave oven for up to 7 minutes. Immediately after cooking, measure the temperature of the outside bottom of the package using a non-contact infrared (IR) thermometer. Observe for deformation, warping, and failure of the package. Sample size: 5 packages.

[0114] Thermomechanical Analysis - Thermal Strain Measurement: The procedure uses a thermomechanical analysis (TMA) program utilizing a Dynamic Mechanical Analysis (DMA) / TMA testing device, such as the TA Instruments Q800 DMA with a DMA controlled force module. Membrane deformation is measured under controlled tension (non-oscillating) within a defined temperature range. A membrane sample 6.3 mm wide × at least 25.0 mm long is cut and loaded into a membrane tension fixture. The fixture is tightened to the manufacturer-recommended clamping force to prevent sample slippage. The distance between the fixtures is approximately 12 mm. The membrane is cut and clamped such that force is applied longitudinally along the membrane. A preload (static) force of 0.504 N is applied to the sample, and the initial distance is recorded. The device is then equilibrated to 35°C. The test is performed using a constant force temperature gradient, where the temperature is gradually varied from 35°C to 130°C at a rate of 10°C / min while a constant force of 0.504 N is applied. During the test, the displacement of the fixtures (i.e., the stretching or shrinkage of the membrane) is measured. The thermal strain value (%) is then calculated and reported as a function of temperature, resulting in a thermal strain curve. The thermal strain value (%) is the displacement distance divided by the initial distance. Standardized data can be collected by re-measuring the samples at equilibrium temperature. The sample size is 10 samples per type of membrane.

[0115] Example

[0116] Pillow Bag: Packaging in pillow bag form is prepared using sidewalls and patches formed from a polyethylene-based film (oriented polyethylene, OPE). The sidewall film structure is a laminate of 90ga OPE / ink / adhesive / 2.0 mil white linear low-density PE (LLDPE). The sidewall film thickness is 73.7 micrometers (2.9 mils). The patch is a die-cut label and includes a polypropylene structure. The patch structure is 65ga PP / adhesive / polyvinylidene chloride (PVDC) / 2.0 mil PP, wherein an acrylic-based adhesive coating is applied to the 65ga PP surface at 13.8 lbs / rm. The patch is adhered to the sealant surface of the sidewall. The patch occupies 100% of the bottom portion of the packaging and is independent of the packaging seal. The patch has a thermal conductivity value of approximately 0.22 W / m·K. The patch thickness is 73.7 micrometers (2.9 mils). The package measures 20.32cm x 22.54cm (8,000 inches x 8.875 inches). The top section of the package includes 67,400 micrometer-long laser-perforated holes.

[0117] Comparative pillow-shaped bag: A pillow-shaped bag was prepared using a laminated film structure with sidewalls of 90ga OPE / ink / adhesive / 2.0 mil white LLDPE. The sidewall film thickness was 73.7 micrometers. The package dimensions were 20.32 cm × 22.54 cm. The top portion of the package included 67,400 micrometer laser-perforated holes.

[0118] Molded-Fill-Sealed Bag: A package in the form of a molded-fill-seal stand-up pouch is prepared using a laminated film structure of 90ga OPE / ink / adhesive / 2.0 mil white LLDPE sidewalls and a patch. The patch is a die-cut label and includes a polypropylene structure. The patch structure is 65ga PP / adhesive / polyvinylidene chloride (PVDC) / 2.0 mil PP, wherein an acrylic-based adhesive coating is applied to the 65ga PP surface at 13.8 lbs / rm. The patch is adhered to the sealant surface of the sidewalls. The patch occupies 100% of the bottom portion of the package and is independent of the package seal. The patch has a thermal conductivity value of approximately 0.22 W / m·K. The sidewall film thickness is 73.7 microns. The patch thickness is 73.7 microns. The package dimensions are 18.73 cm(h) × 20.32 cm(w) (7.375 inches × 8.000 inches). The package includes a 3.81cm (1.50-inch) wide gusset plate. The top section of the package contains 67,400 micron laser-drilled perforations.

[0119] Comparative Molding-Filling-Sealing Bag: A stand-up pouch is prepared using a laminated film structure of 90ga OPE / ink / adhesive / 2.0 mil white LLDPE sidewalls. The sidewall film thickness is 73.7 microns. The package dimensions are 20.32 cm × 22.54 cm. The package includes a 3.81 cm (1.50 inch) wide gusset plate. The top portion of the package includes 67,400 micron laser-perforated holes.

[0120] External packaging temperature results: The bottom external temperature of all packages exceeded 62.8℃ (145℉).

[0121] Deformation, Warping, and Failure Results: Use the rating scale shown in Table 1 to assess defects in the microwaveable packaging. Observe defects throughout the packaging, especially where the product contacts the sidewalls. The four main types of defects reported include holes, wrinkles, blistering, and stretching. The rating scale indicates the severity of defects on a scale of 0 to 5, where 0 indicates no defects observed and 5 indicates severe and / or numerous defects.

[0122] Table 1

[0123]

[0124] Table 2 includes rating results from pillow bag packaging.

[0125] Table 2

[0126]

[0127]

[0128] Table 3 includes an explanation of the defects observed in the pillow-shaped bag packaging samples.

[0129] Table 3

[0130]

[0131] The results of pillow bag packaging indicate that the sample including the patch had a significantly lower average defect rating compared to the control sample, which is further supported by the observations noted in Table 3.

[0132] Table 4 includes rating results from molded-filled-sealed bag packaging.

[0133] Table 4

[0134]

[0135]

[0136] Table 5 includes an explanation of the defects observed in the pillow-shaped bag packaging samples.

[0137] Table 5

[0138]

[0139] The results of the molding-filling-sealing bag packaging indicate that the sample including the patch had a significantly lower average defect rating compared to the control sample, which is further supported by the observations indicated in Table 5.

[0140] Table 6 includes the average defect ratings for the sample groups. The average defect rating for pillow-shaped bag packaging with patches (samples 1-5) is 1.75. The average defect rating for pillow-shaped bag packaging without patches (comparative sample 1-2) is 3.75. The average defect rating for molded-fill-seal bag packaging with patches (samples 1-5) is 1.45. The average defect rating for molded-fill-seal bag packaging without patches (comparative sample 1-2) is 3.125.

[0141] The overall comparative samples (packaging without patches) had an average defect rating of 3.44. The overall packaged samples (packaging with patches) had an average defect rating of 1.6. When patches were present in the packaging, the defect rating decreased by 50%.

[0142] Table 6

[0143]

[0144] Thermal strain value: Figure 13The diagram shows thermal strain curves for the sidewall film (a monopolymer-based film) and patch (a heat-resistant polymer-based film) used in the previously described pillow-shaped bag and form-fill-seal bag packaging embodiments. At temperatures below 120°C, the thermal strain value of the patch film (heat-resistant polymer-based film) can be less than 0.5%. At temperatures below 120°C, the thermal strain value of the sidewall film (a monopolymer-based film) can be less than 3.75%.

Claims

1. A microwaveable package, the microwaveable package comprising: The sidewall includes a membrane, the membrane including a first surface and a second surface; A patch, the patch comprising a film, the film comprising a first surface and a second surface; and Seals; The seal connects the sidewall to itself, the package includes a top portion and a bottom portion, the sidewall film is a monopolymer-based film, the first surface of the sidewall is the exposed surface of the sidewall, the second surface of the sidewall is the sealant surface of the sidewall, the patch is a heat-resistant polymer-based film, the patch is positioned in the bottom portion of the package, and the patch includes a thermal conductivity value of 0.11 W / m Kelvin (W / m·K) to 0.44 W / m·K at 25°C (77°F) when measured according to ASTM 1530-11.

2. The microwaveable package of claim 1, wherein the first surface of the patch is connected to the second surface of the sidewall.

3. The microwaveable package of claim 1, wherein the second surface of the patch is connected to the second surface of the sidewall.

4. The microwaveable packaging according to any one of claims 1-3, wherein the microwaveable packaging further comprises food products.

5. The microwaveable packaging according to claim 4, wherein the food product is frozen.

6. The microwaveable package according to claim 4, wherein the food product contains 0.3% to 7% fat.

7. The microwaveable packaging according to any one of claims 1-3, wherein the monopolymer-based film is a polyethylene-based film.

8. The microwaveable packaging according to any one of claims 1-3, wherein the heat-resistant polymer-based film comprises high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), polypropylene (PP), polyester (PET), polyamide (PA), or a combination thereof.

9. The microwaveable packaging of claim 8, wherein the heat-resistant polymer-based film comprises high-density polyethylene (HDPE), polypropylene (PP), polyamide (PA), or a combination thereof.

10. The microwaveable package according to any one of claims 1-3, wherein the patch is positioned independently of the seal.

11. The microwaveable packaging according to any one of claims 1-3, wherein the microwaveable packaging further comprises a vent.

12. The microwaveable package of claim 11, wherein the patch is positioned independently of the vent.

13. The microwaveable packaging according to any one of claims 1-3, wherein the packaging is suitable for recycling.

14. The microwaveable package according to any one of claims 1-3, wherein the total composition of the package comprises 90% to 99% by weight of a polyethylene-based polymer.

15. A packaged product, the packaged product comprising: The sidewall includes a membrane, the membrane including a first surface and a second surface; The patch includes a film, the film including a first surface and a second surface; a seal; and product; The sealing element connects to form the sidewall of the package, the package includes a package body, the sidewall film is a monopolymer-based film, the first surface of the sidewall is the exposed surface of the sidewall, the second surface of the sidewall is the sealant surface of the sidewall, the patch is a heat-resistant polymer-based film, the product is contained in the package body, the product contains 0.3% to 7% fat content, the product is positioned in the portion of the package including the patch when the package is in an upright position, and the patch has a thermal conductivity value of 0.11 W / m Kelvin (W / m·K) to 0.44 W / m·K at 25°C (77°F) when measured according to ASTM 1530-11.

16. The packaging product of claim 15, wherein the first surface of the patch is connected to the second surface of the sidewall.

17. The packaging product of claim 15, wherein the second surface of the patch is connected to the second surface of the sidewall.

18. The packaged product according to any one of claims 15-17, wherein the product includes food products.

19. A microwaveable package, the microwaveable package comprising: A first sidewall, the first sidewall including a first sidewall membrane, the first sidewall membrane including a first exposed surface and a first sealant surface; The second sidewall includes a second sidewall membrane, and the second sidewall membrane includes a second exposed surface and a second sealant surface; A patch, the patch comprising a film, the film comprising a first surface and a second surface; and Seals; The seal connects the first sidewall to the second sidewall, the package includes a top portion and a bottom portion, the first sidewall film is a first monopolymer-based film, the second sidewall film is a second monopolymer-based film, the patch is a heat-resistant polymer-based film, the patch is positioned in the bottom portion of the package, the patch is attached to the first sidewall, the second sidewall, or a combination thereof, and the patch includes a thermal conductivity value of 0.11 W / m Kelvin (W / m·K) at 25°C (77°F) when measured according to ASTM 1530-11.

20. The microwaveable packaging of claim 19, further comprising an additional patch positioned in the bottom portion of the packaging.

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