Protective laminates

Abstract

The present disclosure relates to flame retardant laminates that can be used to make flame retardant textiles and flame retardant garments. The laminates described herein allow the use of non-flame retardant textiles to produce the flame retardant laminates. This use of non-flame retardant textile can provide laminates that can be much lighter in weight, more comfortable against the skin, more breathable, more durable, produced in a wider array of colors, have better moisture management properties, mechanical strength, and more environmentally friendly than flame retardant laminates that use inherently flame retardant textiles.

Description

TITLEPROTECTIVE LAMINATESTECHNICAL FIELD OF THE DISCLOSURE

[0001] The present disclosure relates to protective laminates comprising multiple textile layers. In particular, the protective laminates can provide protection from flash fires and the discharge of an electric arc.BACKGROUND OF THE DISCLOSURE

[0002] In order to reduce injuries, protective laminates and clothing is desired for professional working in hazardous environments where short duration exposure to flames or electric arc flash is possible. Protective gear for workers exposed to these conditions should provide some enhanced protection to allow the wearer to get away from the hazard quickly and safely, rather that repair the hazard.

[0003] Traditionally, garments that provide protection from an exposure to a short duration flash fire or an electrical flash are relatively heavy and require multiple layers, each layer providing an additional level of protection against the heat from the exposure. Such garments are made with multiple layers comprising non-combustible, non-melting fabric made of, for example, aramids, polybenzimidazole (PBI), poly p- phenylene-2,6-benzobisoxazole (PBO), modacrylic blends, polyamines, carbon, polyacrylonitrile (PAN), and blends and combinations thereof. These fabrics may be inherently flame resistant and are often used in the firefighting community but have several limitations. Specifically, in order to achieve the desired level of protection, relatively heavy weight, bulky fabrics are required. Typically, these fabrics can have a basis weight in excess of 400 grams per square meter. The fibers used to form these fabrics may be very expensive, difficult to dye and print, and may not have adequate abrasion resistance. Additionally, these fibers pick up more water and offer unsatisfactory tactile comfort as compared to nylon or polyester based fabrics. Foroptimum user performance in environments with a potential arc flash exposure and / or flash fires, a lightweight, breathable, water resistant garment with enhanced burn protection may be desired. There is a continuing need for waterproof, flame resistant (FR), arc flash resistant, protective clothing that minimizes or eliminates the use of typical non-combustible, non-melting fabric textiles such as those used in firefighting community.SUMMARY OF THE DISCLOSURE

[0004] In a first embodiment, the present disclosure relates to laminates comprising a) a first textile layer; b) a first layer of a heat reactive material; c) a carrier layer comprising porous polyethylene; d) a second layer of heat reactive material; and e) a second textile layer. In the embodiments described herein, the first and second layer of heat reactive material each independently comprise a polymer resin and expandable graphite. In any of the previous embodiments, the expandable graphite expands at least about 900 micrometers upon heating to about 280°C, as measured in the TMA expansion test.

[0005] Additionally, in any of the embodiments described herein, the first layer of heat reactive material is located between the first textile layer and the carrier layer, and the second layer of heat reactive material is located between the carrier layer and the second textile layer.

[0006] In a second embodiment, each layer of heat reactive material is independently applied in a continuous manner or a discontinuous manner.

[0007] In any of the previous embodiments, each layer of the heat reactive material can be in the form of a pattern of discontinuous dots, lines or grids.

[0008] In any of the previous embodiments, the expandable graphite expands at least about 900 micrometers upon heating to 280°C, as measured in the TMA expansion test.

[0009] In any of the previous embodiments, at least one of the first and the second layer of heat reactive material comprises a flame retardant additive.

[0010] In any of the previous embodiments, the first textile layer, comprises or consists essentially of meltable fibers. In any of the previous embodiments, the first textile layercomprises or consists essentially of nonmeltable fibers. In any of the previous embodiments, the first textile layer comprises or consists essentially of a mixture of meltable and nonmeltable fibers.

[0011] In any of the previous embodiments, the first textile layer can comprise in the range of from 0% to 100% meltable fibers, based on the total weight of the meltable and nonmeltable fibers in the first textile layer. In other embodiments, the first textile layer can comprise in the range of from greater than 0% to 100% meltable fibers, or from 0.5% to 100% meltable fibers, or from 1 % to 100%, or from 1 % to 99% meltable fibers, or from 3% to 100% meltable fibers, or from 5% to 100% meltable fibers, or from 10% to 100% meltable fibers, or from 20% to 100% meltable fibers, or from 25% to 100% meltable fibers, or from 30% to 100% meltable fibers, or from 35% to 100% meltable fibers, or from 40% to 100% meltable fibers, or from 50% to 100% meltable fibers, or from 60% to 100% meltable fibers, or from 70% to 100% meltable fibers, or from 80% to 100% meltable fibers, or from 90% to 100% meltable fibers. In other embodiments, the first textile comprises a combination of meltable and nonmeltable fibers in the range of from 1 to 99% nonmeltable fibers and from 1 to 99% meltable fibers, wherein the percentages by weight are based on the total weight of the fibers in the first textile layer. Each of the percentages are based on the total weight of the fibers in the first textile layer.

[0012] In some of the previous embodiments, the first textile layer can comprise a 100% nylon textile. In some of the previous embodiments, the first textile layer can be a 100% polyester textile. In other embodiments, the first textile layer can be a cotton textile comprising up to 100% cotton. In other embodiments, the first textile layer can be a wool textile comprising up to 100% wool.

[0013] In still further embodiments, the first textile layer can comprise a mixture of nylon and cotton, for example in the range of from 30% to 70% nylon and 30% to 70% cotton; or from 30% to 68% nylon, from 30% to 68% cotton and up to about 5% by weight, based on the total weight of the textile of an antistatic additive.

[0014] In a further embodiment, the first textile layer may comprise a mixture of polyester and cotton, for example in the range of from 30% to 70% polyester and 30%to 70% cotton; or from 30% to 68% polyester, from 30% to 68% cotton and up to about 5% by weight, based on the total weight of the textile of an antistatic additive.

[0015] In any of the previous embodiments, the second textile layer comprises or consists essentially of meltable fibers. In any of the previous embodiments, the second textile layer comprises or consists essentially of nonmeltable fibers. In any of the previous embodiments, the second textile layer comprises or consists essentially of a mixture of meltable and nonmeltable fibers.

[0016] In any of the previous embodiments, the second textile layer can comprise in the range of from 0% to 100% meltable fibers, based on the total weight of the meltable and nonmeltable fibers in the second textile layer. In other embodiments, the second textile layer can comprise in the range of from greater than 0% to 100% meltable fibers, or from 0.5% to 100% meltable fibers, or from 1% to 100%, or from 1 % to 99% meltable fibers, or from 3% to 100% meltable fibers, or from 5% to 100% meltable fibers, or from 10% to 100% meltable fibers, or from 20% to 100% meltable fibers, or from 25% to 100% meltable fibers, or from 30% to 100% meltable fibers, or from 35% to 100% meltable fibers, or from 40% to 100% meltable fibers, or from 50% to 100% meltable fibers, or from 60% to 100% meltable fibers, or from 70% to 100% meltable fibers, or from 80% to 100% meltable fibers, or from 90% to 100% meltable fibers. In other embodiments, the second textile comprises a combination of meltable and nonmeltable fibers in the range of from 1 to 99% nonmeltable fibers and from 1 to 99% meltable fibers. Each of the percentages are based on the total weight of the fibers in the second textile layer.

[0017] In some of the previous embodiments, the second textile layer can comprise a 100% nylon textile. In other embodiments, the second textile layer can be a 100% polyester textile. In other embodiments, the second textile layer can be a cotton textile comprising up to 100% cotton. In other embodiments, the second textile layer can be a wool textile comprising up to 100% wool.

[0018] In still further embodiments, the second textile layer can comprise a mixture of nylon and cotton, for example in the range of from 30% to 70% nylon and 30% to 70% cotton; or from 40% to 60% nylon and from 40% to 60% cotton or from 30% to 68%nylon, from 30% to 68% cotton and up to about 5% by weight, based on the total weight of the textile of an antistatic additive.

[0019] In another embodiment, the second textile layer may comprise a mixture of polyester and cotton, for example in the range of from 30% to 70% polyester and 30% to 70% cotton; or from 30% to 68% polyester, from 30% to 68% cotton, and up to about 5% by weight, based on the total weight of the textile of an antistatic additive.

[0020] In another embodiment the second textile layer may a mixture of aramid and flame retardant viscose, for example in the range of from 30 to 68% of an aramid and from 30 to 68% of a flame retardant viscose with up to about 5% by weight, based on the total weight of the textile, of an antistatic additive.

[0021] In any of the previous embodiments, the layers a) and c) are bonded to each other using the first layer of heat reactive material and the layers c) and e) are bonded to each other using the second layer of heat reactive material.

[0022] In any of the previous embodiments, the first layer of heat reactive material covers greater than or equal to 25% of the first textile layer and / or the carrier layer.

[0023] In any of the previous embodiments, the second layer of heat reactive material covers greater than or equal to 25% of the second textile layer and / or the carrier layer.

[0024] In any of the previous embodiments, the carrier layer comprises porous polyethylene. In some embodiments, the carrier layer can be a film or a membrane. In any of the previous embodiments, the porous polyethylene is an expanded ultrahigh molecular weight polyethylene. In other embodiments, the porous polyethylene is a porous polymer comprising pores, and the pores are at least partially filled with a hydrophilic polymer. In some embodiments, the hydrophilic polymer is a polyurethane, a polyamide, a polyester, a polyether, an ionomer, or a copolymer or a combination thereof. In some embodiments, the weight average molecular weight of the porous polyethylene is greater than 500,000 grams / mole.

[0025] In any of the previous embodiments, the laminate may further comprise one or more additional layers of heat reactive material and one or more additional layers of textile layers, wherein each subsequent additional layer is positioned adjacent to at least one of the first and / or second textile layers.

[0026] In any of the previous embodiments, the polymer resin comprises an aqueous acrylic resin.

[0027] In any of the previous embodiments, the laminate further comprises a protective layer. In any embodiments comprising a protective layer, the protective layer is located between the first textile layer and the carrier layer.

[0028] The present disclosure also relates to a method of forming a laminate comprising: i) adhering a first textile layer to a carrier layer with a first heat reactive material in between to form a precursor laminate; and ii) adhering the precursor laminate to a second textile layer with a second heat reactive material in between, wherein the first and second heat reactive materials independently comprise a polymer resin and expandable graphite, and wherein the carrier layer comprises a porous polyethylene.

[0029] In any of the previous embodiments, the laminates can be used in a protective article, wherein the first textile layer is an outer portion of the protective article, when compared with the second textile layer, which forms an inner portion of the protective article. The protective articles can include, for example, garments such as shirts, jackets, pants, coveralls, overalls, aprons, hats, gloves and footwear; covers, blankets, tents.

[0030] The present disclosure also relates to the use of any of the previously described laminates to increase the thermal protective performance of a protective article comprising the laminate against an arc discharge, when compared to a protective article that does not use the first and second layers of heat reactive material.

[0031] The disclosure relates to a garment comprising the laminate of any one of the previous embodiments.

[0032] Laminates according to the present disclosure are useful for use as flame retardant articles, for example, as a flame retardant garment, a flame retardant blanket, or a flame retardant cover. Typically, flame retardant garments were required to use flame retardant textiles to make the flame retardant garments. The laminates described herein allow the use of non-flame retardant textiles and films to produce the laminates. This use of non-flame retardant textile can provide laminates that can have one or moreof the following benefits:The laminates can be much lighter in weight, more comfortable against the skin, more breathable, more durable, produced in a wider array of colors, have better moisture management properties, mechanical strength, and become more environmentally friendly. The disclosed laminates can also help to reduce the environmental footprint by utilizing recycled components in the textile layers.DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic illustration of a cross-sectional view of one embodiment described herein.

[0034] Figure 2 is a schematic illustration of a cross-sectional view of one embodiment described herein.

[0035] Figures 3A and 3B are schematic illustrations of laydowns of the heat reactive material according to two different embodiments.

[0036] Figure 4 is a schematic illustration of overlapping, partially overlapping and nonoverlapping dots of heat reactive material.DETAILED DESCRIPTION

[0037] The disclosures of all cited patent and non-patent literature are incorporated herein by reference in their entirety.

[0038] As used herein, the term “embodiment” or “disclosure” is not meant to be limiting, but applies generally to any of the embodiments defined in the claims or described herein. These terms are used interchangeably herein.

[0039] Unless otherwise disclosed, the terms “a” and “an” as used herein are intended to encompass one or more (i.e. , at least one) of a referenced feature.

[0040] The features and advantages of the present disclosure will be more readily understood, by those of ordinary skill in the art from reading the following detailed description. It is to be appreciated that certain features of the disclosure, which are, for clarity, described above and below in the context of separate embodiments, may alsobe provided in combination in a single element. Conversely, various features of the disclosure that are, for brevity, described in the context of a single embodiment, may also be provided separately or in any sub-combination. In addition, references to the singular may also include the plural (for example, “a” and “an” may refer to one or more) unless the context specifically states otherwise.

[0041] The use of numerical values in the various ranges specified in this application, unless expressly indicated otherwise, are stated as approximations as though the minimum and maximum values within the stated ranges were both proceeded by the word “about”. In this manner, slight variations above and below the stated ranges can be used to achieve substantially the same results as values within the ranges. Also, the disclosure of these ranges is intended as a continuous range including each and every value between the minimum and maximum values.

[0042] As used herein, the terms “fiber”, “filament” and “yarn” may be used interchangeably, unless specifically stated otherwise. A fiber is intended to mean a thin thread having a finite length, for example, from a few millimeters to about 30 centimeters in length. The term “filament” is intended to mean a thin thread having an essentially endless length. A filament may be thousands of meters long. The term “yarn” means a continuous strand comprising one or more fibers and / or filaments. Any of the known yarns can be used, for example, single-ply yams, plied yarns, cord yarns, stretch yarns or any combinations thereof. Fibers and / or filaments can be used to make the yarns.

[0043] As used herein, the term “membrane” means a polymer in the form of an essentially two-dimensional sheet, wherein the length and the width are both much greater than the thickness, for example, both the length and the width are at least 100 times the thickness. In some embodiments, the membrane is a porous membrane having a structure of pores that allows, for example, water vapor to pass through the thickness of the membrane without liquid water being able to penetrate from one side of the membrane to the other. On average, the pore size is on the order of several nanometers to approximately one micrometer.

[0044] As used herein, the term “film” means a porous membrane having a structure of pores wherein the pores have been at least partially filled with a polymer such that theflow of gases or liquids does not occur through open pore channels in the membrane. In some embodiments, the polymer at least partially filling the pores can be a hydrophilic polymer.

[0045] The term “hydrophilic polymer” refers to a polymer that can allow substantial amounts of water to be transferred through the film by absorbing water on one side of the film where the water concentration is higher and desorbing or evaporating the water on the opposite side of the film where the water vapor concentration is lower. In some embodiments, a layer of the hydrophilic polymer that is 10 micrometers thick can have a moisture vapor transmission rate of greater than or equal to 5,000 g / meter2 / day, or greater than or equal to 10,000 g / meter2 / day.

[0046] The phrases "porous polyethylene membrane”, “microporous polyethylene membrane” and “polyethylene membrane” are used interchangeably throughout the specification. Unless specifically stated otherwise, the above phrases mean a polyethylene membrane having pores, the membrane is characterized with i) a weight average molecular weight greater than 500,000 g / mol; ii) a porosity of at least 40%; and iii) a Gurley number of less than 200 seconds.

[0047] Under magnification, the porous polyethylene membrane shows a fibrillated structure of polyethylene fibrils, and with sufficient magnification it is possible to see one or more polyethylene fibrils, optionally three or more of the fibrils can be interconnected by one or more intersections of the three or more fibrils.

[0048] As used herein, the term “polyethylene” means a polyethylene polymer having less than 5 percent by weight of one or more comonomers. In some embodiments, the polyethylene is free from any fluorine containing comonomers, and, in still further embodiments, the polyethylene is polyethylene homopolymer.

[0049] As used herein, the term “meltable”, when used in relation to a fiber, a filament, a yarn, or a textile, means a fiber that melts at less than or equal to 280°C or less than or equal to 300°C, according to the melting and thermal stability test described herein. In embodiments wherein the yarn or textile is made from a singular material, for example, 100% nylon, the melting point of the material is the melting point of the nylon. However, in yarn or textile embodiments comprising a mixture of both meltable and non- meltable fibers, the presence of the non-meltable component may mask the melting ofthe meltable material. For example, in the case of a textile comprising a 50 / 50 blend of nylon 6.6 and cotton, the melt of melted nylon 6.6 may be absorbed by the cotton component and, when subjected to the melting and thermal stability test described herein, may appear to show that the textile sample is not meltable. Therefore, when there is a meltable fiber present in a blend of meltable and non-meltable fibers, the blend material will be considered to be a meltable material for the purposes of this disclosure.

[0050] The disclosure describes textiles that are used in various layers of the laminate. As used herein, each of the first and second textile layers can independently be a single textile layer or a multilayer textile layer in a woven, knit or nonwoven form. Textiles are produced from fibers, filaments and / or yarns that can be meltable, nonmeltable, or a combination thereof. The fibers, filaments or yarns can be synthetic and / or natural. Depending upon the type and the compositions of the fibers, filaments or yarns, the corresponding textiles can have a variety of different properties. The textiles can be meltable, nonmeltable, flammable, flame-resistant, abrasion-resistant, heat-resistant, shrink-resistant or the textiles can have a combination of those properties.

[0051] As use herein, the term “shrink-resistant” means that the textiles and / or laminates shrink less than 20% or less than 10% or less than 5% of their width, their length or both, when exposed to a high energy event. In other embodiments, the laminates described herein shrink less than 20% or less than 10% or less than 5% when subjected to the shrink test according to ISO 17493 at 180°C. In other embodiments, the laminates described herein shrink less than 20% or less than 10% or less than 5% when subjected to the shrink test according to ISO 17493 at 260°C. As used herein, the term “high energy” or “high energy event” means an exposure of greater than or equal to 0.1 seconds to a temperature of greater than or equal to 180°C.

[0052] Described herein are laminates having a) a first textile layer, b) a first layer of a heat reactive material, c) a carrier layer comprising porous polyethylene, d) a second layer of heat reactive material and e) a second textile layer, wherein the first and second layers of heat reactive material each independently comprise a polymer resin and expandable graphite; wherein the first layer of heat reactive material is between the first textile layer and the carrier layer and the second layer of heat reactive material isbetween the carrier layer and the second textile layer. The laminates can be used to make protective articles, including protective clothing, wherein the first textile layer is typically the outermost layer of the clothing, and the second textile layer is an inner layer of the clothing. Protective articles can include, for example, clothing, garments, tents, blankets, and / or coverings. Protective clothing includes garments like jackets, trousers, shirts, vests, overalls as well as gloves, gaiters, hoods, footwear and shoes. Protective clothing comprising the laminates may be waterproof or water resistant, and breathable. Protective clothing needs to be lightweight to be widely used, especially in cases where the danger of an exposure to a flash fire or a high heat incident, for example, exposure to an electrical arc flash is present, but of a low probability.

[0053] In some embodiments, the laminates can have a weight of, for example, less than or equal to 500 grams per meter2(gsm). In some embodiments, the laminates can have a weight of in the range of from 200 gsm to 500 gsm, or from 200 gsm to 475 gsm, or from 200 gsm to 450 gsm or from 200 gsm to 425 gsm, or from 200 gsm to 400 gsm. In still further embodiments, the laminate can have a weight in the range of from 225 gsm to 400 gsm, or from 250 gsm to 375 gsm, or from 275 gsm to 375 gsm, or from 275 gsm to 350 gsm.

[0054] To reduce the weight of the laminates, the weight has to be reduced without losing the protective properties or decreasing breathability or waterproofness. As described herein, the weight of each of the first textile layer, the carrier layer and the second textile layer can be reduced without sacrificing the ability of the laminate to provide the wearer with protection from a high heat incident or electric arc flash exposure. By utilizing relatively lightweight layers, the overall weight of the laminates can be reduced. However, when the weight of the layers a), c) and / or e) is too low, there can be an increased risk during a flash fire or other high heat condition that enough heat or energy from the incident can affect the wearer. Therefore, the present laminates provide additional protection by utilizing at least two layers of heat reactive material. The first layer of heat reactive material absorbs at least a portion of the heat from the incident, while the second layer of heat reactive material can absorb an additional amount of heat that may have been transferred through the carrier layer and can help to minimize the heat transferred to a wearer.

[0055] FIRST TEXTILE LAYER

[0056] Laminates described herein comprise a first textile layer. Suitable fibers, filaments or yarns for the first textile layer can comprise nylon, nylon 6, nylon 6.6, nylon 12, nylon 6.12, polyester, polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyurethane, elastane, acrylic, polyolefin, polyethylene, polypropylene, aramids, meta-aramids, para-aramids, NOMEX® aramid, KEVLAR® aramid, polyamide-imides, polybenzimidazole (PBI), polybenzoxazole (PBO), FR viscose, FR cotton, modacrylic, polyamine, carbon fiber, fiberglass, polyacrylonitrile (PAN), PTFE, viscose, rayon, cotton, wool, silk, cellulose, jute, flax, bamboo, hemp or a combination thereof. Virgin or recycled fibers or a combination thereof, filaments or yarns may be used. The fibers and / or filaments can be combined using known methods to form yarns. A yarn can be produced from a single type of fiber or filament, or the yarn may be produced from a blend of two or more different types of fibers or filaments. Similarly, the first textile layer may be formed from a single type of fibers, filaments, and / or yarns or from multiple different fibers, filaments and / or yarns to provide the desired textile properties. The textiles can be woven, knits or nonwoven textiles.

[0057] The first textile layer forms a portion of the laminate that is intended to be an outer layer of a protective article, exposed directly to a high energy event, for example, exposure to heat and / or flame. In some embodiments, the first textile layer comprises a meltable textile layer, i.e. , a textile layer that comprises meltable fibers according to the definition of meltable as provided herein. In some embodiments, the first textile layer comprises a nonmeltable textile layer, for example, a cotton textile. In other embodiments, the first textile layer can comprise a combination of meltable and nonmeltable fibers, filaments and / or yarns, for example, a nylon / cotton blend or a polyester / cotton blend. In some embodiments, the first textile is a textile that is a no melt and / or no drip textile according to the melting and thermal stability test as defined herein. In some embodiments, the first textile is a textile that comprises meltable fibers, filaments or yarns and considered to be a no melt and / or no drip textile according to the melting and thermal stability test as defined herein. In still further embodiments, the first textile layer can comprise a combination of meltable fibers, filaments, and / or yarns and nonmeltable fibers, filaments, and / or yarns that are flame retardant. For example, thefirst textile layer can be a woven textile with flame retardant filaments or yarns in the warp and / or weft direction in a regular repeating pattern, for example every n warp and / or weft courses, wherein each n is independently 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 , 12, 13, 14, 15, 16, 17, 18, 19 or 20, with the remaining filaments or yarns being meltable. The placement of a flame retardant filament or yarn every n courses is similar to a ripstop woven textile. Suitable textile layers incorporating both meltable and flame retardant nonmeltable fibers can be found in International Patent Application Publication No. WO2019 / 212549 to W.L. Gore and Associates, Inc., or U.S. Patent Application Publication No. 2022 / 0363042 to W.L. Gore and Associates, Inc., the contents of both which are herein incorporated by reference in their entirety.

[0058] In any of the previous embodiments, the first textile layer can comprise in the range of from 0% to 100% meltable fibers, based on the total weight of the meltable and nonmeltable fibers in the first textile layer. In other embodiments, the first textile layer can comprise in the range of from greater than 0% to 100% meltable fibers, or from 0.5% to 100% meltable fibers, or from 1 % to 100%, or from 1 % to 99% meltable fibers, or from 3% to 100% meltable fibers, or from 5% to 100% meltable fibers, or from 10% to 100% meltable fibers, or from 20% to 100% meltable fibers, or from 25% to 100% meltable fibers, or from 30% to 100% meltable fibers, or from 35% to 100% meltable fibers, or from 40% to 100% meltable fibers, or from 50% to 100% meltable fibers, or from 60% to 100% meltable fibers, or from 70% to 100% meltable fibers, or from 80% to 100% meltable fibers, or from 90% to 100% meltable fibers. In other embodiments, the first textile comprises a combination of meltable and nonmeltable fibers in the range of from 1 to 99% nonmeltable fibers and from 1 to 99% meltable fibers, wherein the percentages by weight are based on the total weight of the fibers in the first textile layer. Each of the percentages are based on the total weight of the fibers in the first textile layer.

[0059] In some of the previous embodiments, the first textile layer can comprise a 100% nylon textile. In some of the previous embodiments, the first textile layer can be a 100% polyester textile. In other embodiments, the first textile layer can be a cotton textile comprising up to 100% cotton. In other embodiments, the first textile layer can be a wool textile comprising up to 100% wool.

[0060] In still further embodiments, the first textile layer can comprise a mixture of nylon and cotton, for example in the range of from 30% to 70% nylon and 30% to 70% cotton; or from 30% to 68% nylon, from 30% to 68% cotton and up to about 5% by weight, based on the total weight of the textile of an antistatic additive.

[0061] In a further embodiment, the first textile layer may comprise a mixture of polyester and cotton, for example in the range of from 30% to 70% polyester and 30% to 70% cotton; or from 30% to 68% polyester, from 30% to 68% cotton and up to about 5% by weight, based on the total weight of the textile of an antistatic additive.

[0062] In still further embodiments, the laminate comprises a first textile layer comprising a combination of meltable and nonmeltable fibers in the range of from 1 to 99% nonmeltable fibers and from 1 to 99% meltable fibers. In other embodiments, the first textile layer can comprise meltable fibers in the range of from 5% to 100%, or from 10% to 100%, or from 20% to 100%, or from 25% to 100%, or from 30% to 100%, or from 35% to 100%, or from 40% to 100%, or from 50% to 100%, or from 60% to 100%, or from 70% to 100%, or from 80% to 100%, or from 90% to 100%. Each of the percentages are based on the total weight of the meltable and nonmeltable fibers in the first textile layer.

[0063] In further embodiments, the first textile layer can be a knit, e.g., a nylon knit, a polyester knit, a polyurethane knit or knits containing combinations of one or more nylons, polyesters, cotton, and / or polyurethanes. A knit construction may provide a relatively lightweight textile that helps to reduce the overall weight of the laminate while still retaining the desired flame resistant and / or arc resistant properties of the laminate. In some embodiments, the laminate comprises a first textile layer that is free from or essentially free from flame retardant or flame resistant additives. In some embodiments, the first textile layer may be produced from one or more recycled fibers, filaments or textiles.

[0064] In some embodiments, the first textile layer comprises a textile produced from fibers, filaments or yarns having a denier (weight in grams of 9,000 meters of the fiber, filament or yarn) in the range of from 5 denier (D) to 400D. In other embodiments, the fibers, filaments or yarns can have a denier in the range of from 5D to 300D or from 5D to 250D or from 5D to 200D or from 7D to 150D or from 7D to 100D.

[0065] In some embodiments, the first textile layer can be a woven or a knit textile comprising nylon fibers, filaments or yarns with a denier of in the range of from 5D to 400D. In some embodiments the first textile layer comprises a woven or knit textile made from nylon yarns with a denier in the range of from 5D to 400D or from 5D to 300D or from 5D to 250D or from 5D to 200D or from 7D to 150D or from 7D to 100D. In other embodiments, the first textile layer can be a woven or a knit textile made from polyester fibers, filaments or yarns, wherein the yarns have a denier in the range of from 5D to 400D or from 5D to 300D or from 5D to 250D or from 5D to 200D or from 7D to 150D or from 7D to 100D. Optionally, any of the first textile layers described herein can be waterproof and / or the first textile layer can be water resistant by applying a durable water resistant (DWR) treatment to the first textile layer or to the laminate. This DWR coating can be on the outer side of the first textile layer, on the side that is opposite the first layer of heat reactive material. In another embodiment, the first textile layer comprises a waterproof material.

[0066] The first textile layer may also comprise antistatic agents, antistatic particles, antistatic fibers, or antistatic polymers as a filler, as a coating, or as part of the fibers that make up the first textile layer. Suitable antistatic materials can comprise, for example, carbon black, conductive fibers, metal particles, or electrically conductive polymers.

[0067] The first textile layer is lightweight, having a weight less than or equal to 200 grams / square meter (gsm), e.g., less than 200 gsm, less than 190 gsm, less than 180 gsm, less than 170 gsm, less than 160 gsm, less than 150 gsm, less than 140 gsm, less than 130 gsm, less than 125 gsm, less than 120 gsm, less than 110 gsm, less than 100 gsm, less than 90 gsm or less than 85 gsm. In order for the first textile layer to have sufficient strength and durability, the textile weight should be greater than or equal to 15 gsm, or greater than or equal to 20 gsm, or greater than or equal to 25 gsm, or greater than or equal to 30 gsm, or greater than or equal to 35 gsm, or greater than or equal to 40 gsm, or greater than or equal to 45 gsm, or greater than or equal to 20 gsm, or greater than or equal to 55 gsm. It should be noted that with increasing amounts of nonmeltable fibers, the weight of the textile generally needs to be higher in order to have a first textile layer with adequate durability, strength, and abrasion-resistance. Forexample, with a 50 / 50 nylon / cotton blend, the textile weight should be in the range of 120 to about 150 gsm.

[0068] In another embodiment, the laminate may further comprise a protective layer comprising a scrim layer or an open textile layer. The protective layer is an intermediate layer that is between the first textile layer and the carrier layer and is made from a flame retardant material. As used herein, scrim is intended to mean a woven textile that has an average gap between adjacent warp and / or weft filaments or yarns in the range of from 0.50 millimeters to 10 millimeters. As used herein, open textile is intended to mean a knit or nonwoven textile that has an average open area between adjacent courses of filaments or yarns in the range of from 0.25 millimeters2to 100 millimeters2as measured by optical profilometry using a Keyence VR-5000 Wide Area 3D Measurement System Controller using the integrated software, by measuring 4 to 6 openings and then calculating the average of those measurements. The protective textile should also be relatively thin, between 0.002 millimeters and 0.5 millimeters thick.

[0069] The protective layer, being relatively open and thin, allows the heat reactive material to adhere both the first textile layer and the protective layer to the carrier layer. It is believed that during exposure to heat, the heat reactive material is able to expand in the open areas of the protective layer, i.e., the spaces between the filaments or yarns and absorb the melting first textile layer. Thus, the thicker the protective layer, the larger the average open area between adjacent warp and / or weft filaments or yarns of a scrim or the larger the open area of the knit or the nonwoven textile needs to be.

[0070] The protective layer can comprise inherently flame retardant fibers or fibers that have been treated with flame retardant agents. Inherently flame retardant fibers can include, for example, aramid fiber, meta aramid fiber, para aramid fiber, polyamideimide fiber, polybenzimidazole (PBI) fiber, polybenzoxazole (PBO) fiber, FR viscose fiber, FR cotton fiber, modacrylic fiber, polyamine fiber, carbon fiber, fiberglass fiber, polyacrylonitrile (PAN) fiber, alumina silica fiber, BELCOTEX® silica gel fiber, ceramic fiber, calcium magnesium silicate fiber, basalt fiber, novoloid / phenolic fiber, PTFE fiber or a combination thereof. In some embodiments, the inherently flame retardant fibers are aramid fibers, glass fibers, or a combination thereof. Materials that are not inherently flame retardant, but can be treated with flame retardant agents can include,for example, nylon, nylon 6, nylon 6.6, nylon 12, nylon 6.12, polyester, polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyurethane, elastane, acrylic, polyolefin, polyethylene, polypropylene, or a combination thereof. These materials can be made into fibers, filaments or yarns and fabrics produced therefrom.

[0071] The use of a protective layer located between the first textile layer and the carrier layer can help the laminate pass the break open evaluation when tested against the ISO 15025 A / B horizontal flame test. In other words, laminates that comprise the protective layer do not break open when tested against the ISO 15025 A / B horizontal flame test.

[0072] HEAT REACTIVE MATERIAL

[0073] Laminates described herein also comprise a first layer of heat reactive material and a second layer of heat reactive material. The first and second layers of heat reactive material can be chosen independently of each other and can be the same or different. For the purpose of this disclosure, the following description of the heat reactive material is intended to describe materials that can be used for the first and / or the second layers of heat reactive materials, unless otherwise specifically noted.

[0074] Laminates described herein comprise at least two layers of heat reactive material. Each layer of the heat reactive material independently comprises a mixture of a polymer resin and a graphite, for example, an expandable graphite. If tested using the Furnace Expansion Test described herein, expandable graphite suitable for use in the protective articles have an average expansion of at least 9 cc / g at 300°C. In one example, Asbury 3626 expandable graphite (available from Asbury Graphite Mills, Inc) has an average expansion rate of about 19 cc / g at 300°C, whereas Asbury 3538 expandable graphite (available from Asbury Graphite Mills. Inc.) has an average expansion rate of about 4 cc / g at 300°C, when tested according to the Furnace Expansion Test as described herein.

[0075] Suitable expandable graphite expands at least 300%, or at least 350%, or at least 400%, or at least 450%, or at least 500%, according to the TMA expansion test provided herein. In some embodiments, laminates comprising heat reactive materialwith expandable graphite having an expansion greater than 900 micrometers (pm) at 280°C, according to the TMA expansion test provided herein.

[0076] In one embodiment the heat reactive materials are in the form of a mixture of a polymer resin and an expandable graphite. Expandable graphite particle size suitable for present invention should be chosen so that the heat reactive material may be applied with the selected application method. For example, where the heat reactive material is applied by a gravure printing technique, the expandable graphite particle size should be small enough to fit in the gravure cells.

[0077] In certain embodiments, the heat reactive materials comprise expandable graphite having at least the expansion as described above and an endotherm of at least about 100 Joules / gram (J / g) when tested according to the Differential Scanning Calorimetry (DSC) Endotherm Test method described herein. In other embodiments, it may be desirable to use expandable graphite with an endotherm greater than or equal to about 150 J / g greater than or equal to about 200 J / g or an endotherm greater than or equal to about 250 J / g.

[0078] In some embodiments, laminates comprising heat reactive material with expandable graphite having an expansion greater than 900 micrometers (pm) at 280°C and an endotherm greater than 100 J / g, have an average afterflame value of less than 20 seconds or an average char length of less than 20 centimeters (cm) or both, when tested according to the Edge Ignition Test described herein.

[0079] In other embodiments, the laminates can have an average afterflame of less than 10 seconds, or less than 2 seconds and / or the laminates may have an average char length less than 15 cm or less than 10 cm, when tested according to the Edge Ignition Test.

[0080] The first and second layer of heat reactive material each independently comprise a polymer resin and expandable graphite. Polymer resins having a melt or softening temperature of less than 280°C (as measured by DSC) are suitable for use in the heat reactive material. In some embodiments, the polymer resins are sufficiently flowable or deformable to allow the expandable graphite to expand substantially upon heat exposure at or below 280°C. It may be desirable that the extensional viscosity of a polymer resin is low enough to allow for the expansion of expandable graphite and highenough to maintain the structural integrity of the heat reactive material after expansion of the mixture of polymer resin and expandable graphite.

[0081] In other embodiments, a polymer resin is used which has a storage modulus between 103and 108dyne / cm2and Tan delta between 0.1 and 10 at 200°C. In other embodiments, the polymer resin has a storage modulus between 103and 106dyne / cm2. In another embodiment, a polymer resin is used that has a storage modulus between 103and 104dyne / cm2.

[0082] Polymer resins suitable for use in some embodiments are elastomeric. Other polymer resins suitable for use in some embodiments are cross-linkable, such as crosslinkable polyurethane, for example, MOR-MELT® R7001 E (from Rohm & Haas). In other embodiments, suitable polymer resins are thermoplastic having a melt temperature between 50°C and 250°C, such as DESMOMELT® VP KA 8702 (from Covestro AG, Leverkusen, DE). Polymer resins suitable for use in embodiments described herein comprise polymers which include but are not limited to polyesters, thermoplastic polyurethanes and cross-linkable polyurethanes, and combinations thereof. Other polymer resins may comprise one or more polymers selected from polyester, polyamide, acrylic, vinyl polymer, polyolefin, silicone or epoxy.

[0083] In other embodiments, the polymer resin may be an aqueous polymer resin, for example, an aqueous acrylic resin such as the acrylic resins taught in EP4030952, the disclosure of which is herein incorporated in its entirety.

[0084] In some embodiments, the aqueous acrylic resin may be a water-based acrylic polymer resin. The aqueous acrylic resin may include acrylamide repeat units. The aqueous acrylic resin may include N-methylol acrylamide repeat units. The aqueous acrylic resin may be a water-based acrylic polymer resin and may contain N-methylol acrylamide repeat units such as, for example, EDOLAN® AM available from Tanatex Chemicals B.V., Ede, Netherlands. The aqueous acrylic resin may be an acrylic copolymer comprising styrene in different amounts. The aqueous acrylic resin may be an acrylic copolymer comprising acrylamide monomers in different amounts. The aqueous acrylic resin may further comprise acrylonitrile, vinyl acetates, styrene or a combination thereof.

[0085] In some embodiments, the aqueous acrylic resin may be a thermoplastic. The aqueous acrylic resin may be self-crosslinked. The acrylic polymer may be a crosslinkable acrylic polymer. The term “self-crosslinking” means that the aqueous acrylic resin comprises functional groups that can react with one another under certain conditions, for example, elevated temperature, hydrolysis conditions, etc., as is known in the art, to form a crosslinked polymer. In some aspects, the self-crosslinking can start cross-linking by applying an elevated temperature of, for example, about 120°C or higher without any additional chemicals. The aqueous acrylic resin may comprise a cross-linker. The aqueous acrylic resin may be uncrosslinked. The aqueous acrylic resin may be self-crosslinked and may further comprise a cross-linker. An additional crosslinker may improve the bonding to textiles. The heat reactive composition may comprise a crosslinker in order to form a crosslinked aqueous acrylic resin.

[0086] In some embodiments, the heat reactive composition may comprise or consist essentially of an aqueous acrylic resin, expandable graphite, at least one FR additive and a crosslinking agent. Suitable crosslinking agents may include, for example, one or more of: polyisocyanate based crosslinking agents, blocked polyisocyanate based crosslinking agents. Other suitable crosslinking agents are the following materials: N- methoxymethylmelamine, methylolmelamine, carbodiimide, polycarbodiimide, isocyanate, polyisocyanate, diaminocarbamate, propylenimine crosslinker depending on their chemical construction, propylenimine, aliphatic propylenimine, aromatic propylenimine deritatives, reaction products between polyfunctional acrylates and propylenimine, (cyclo)aliphatic bisamide crosslinker or a combination thereof.

[0087] In some embodiments, the heat reactive composition may comprise a crosslinking agent at equal to or less than about 10% by weight, or equal to or less than about 9% by weight, or equal to or less than about 8% by weight, or equal to or less than about 7% by weight, or equal to or less than about 6% by weight, or equal to or less than about 5% by weight, or equal to or less than about 4% by weight, or equal to or less than about 3% by weight, or equal to or less than about 2% by weight, or equal to or less than about 1 % by weight, based on the total weight of the aqueous acrylic resin and the crosslinking agent.

[0088] Aqueous acrylic resins having a melt or softening temperature of less than about 280°C may be used. The aqueous acrylic resins may allow expandable graphite to expand at least about 900 micrometers upon heating to about 280°C, as measured in the TMA expansion test.

[0089] The heat reactive material may comprise a flame retardant material. In some embodiments, the flame retardant materials may be optionally incorporated in the polymer resin. In some embodiments, the polymer resins may include at least one component or additive selected from the group consisting of chlorinated compounds, brominated compounds, antimony oxide, organic phosphorous-based compounds, phosphate esters, resorcinol bis(diphenyl phosphate), zinc borate, ammonium polyphosphate, melamine cyanurate, melamine polyphosphate, molybdenum compounds, alumina trihydrate and magnesium hydroxide, which may enhance the flame resistance of the composite articles. In some embodiments, the flame retardant materials are melamine polyphosphate, resorcinol bis(diphenyl phosphate), or a combination thereof. The flame retardant materials may be present in an amount in the range of from 0% to 60% by weight, based on the total weight of the heat reactive material. In other embodiments, the flame retardant materials may be present in an amount in the range of from 10% to 55% by weight, based on the total weight of the heat reactive material. In some embodiments, at least one of the first layer or the second layer of heat reactive material comprises a flame retardant material.

[0090] In some embodiments, upon exposure of the laminate to flames and / or extreme heat, for example, at a temperature greater than or equal to 280°C, a meltable portion of the first textile layer, if present, melts and absorbs into the heat reactive material. At the same time, the heat reactive material can expand. In other embodiments, upon exposure of the laminate to flames and / or extreme heat, for example, at a temperature greater than or equal to 300°C, a meltable portion of the first textile layer, if present, melts and absorbs into the heat reactive material. At the same time, the heat reactive material can expand. These processes can also form a char comprised of the first textile layer and the heat reactive material.

[0091] The char, resulting from exposure of the first textile layer and the first layer of heat reactive material to heat and / or high temperatures, for example, greater than orequal to 280°C or greater than or equal to 300°C, is a heterogeneous mixture of the first textile layer and the expanded first layer of heat reactive material. Char, according to this disclosure, is meant to refer to the carbonaceous material remaining after exposing the melt of the first textile layer and the heat reactive material to a temperature of greater than or equal to 280°C or greater than or equal to 300°C. The char is a mixture of the expanded graphite and one or both of the melted polymer resin and any meltable portion of the first textile layer. At temperatures greater than or equal to 280°C or greater than or equal to 300°C, one or both of the first textile layer and polymer resin may also oxidize or participate in the combustion process forming additional carbonaceous material that becomes part of the char. The formation of the char can help to insulate the layers behind the char from exposure to heat.

[0092] Upon exposure of the laminate to flames and / or extreme heat, the first layer of heat reactive material can expand within (or mix with) the melt of the first textile layer. In doing so the first layer of heat reactive material mixes with the melted first textile layer and protects the layers beneath and the wearer of the article. In one embodiment, laminates can have a break-open time that is increased by at least 20 seconds, or increased by at least 30 seconds, over a laminate constructed of substantially the same materials, but without the expandable graphite material, in which the expansion process described above does not occur, when tested according to the method for Horizontal Flame Test described herein.

[0093] In some embodiments of the heat reactive material, the mixture of polymer resin and expandable graphite, upon expansion, forms a plurality of tendrils comprising expanded graphite. The total surface area of the heat reactive material increases significantly when compared to the same mixture prior to expansion. In one embodiment, the surface area of the mixture is increased at least five times after expansion. In another embodiment, the surface area of the mixture increases at least ten times after expansion. In addition, tendrils will often extend outward from the expanded mixture. In an embodiment where the heat reactive material is situated on a substrate in a discontinuous form, the tendrils will extend to at least partially fill the open areas between the discontinuous domains. In a further embodiment, the tendrils will be elongated, having a length to width aspect ratio of at least 5 to 1 .

[0094] During exposure to a high energy event, for example, exposure to heat, flame and / or an arc flash, the combination of the first textile layer and the first layer of heat reactive material may dissipate or absorb at least a portion of the incident energy being transferred during the high energy event, due to the melting and / or expansion described above. If the energy and / or heat transferred through the carrier layer is high enough, the expandable graphite particles of the second layer of heat reactive material can expand in the same manner as the expandable graphite in the first layer of heat reactive material, forming an additional layer of insulation and absorbing another portion of the energy from the high energy event, thereby providing an increased level of thermal protection to the wearer. In some embodiments, the second textile layer may comprise meltable fibers, filaments and / or yarns. If the second textile layer also melts, the second layer of heat reactive material can absorb the melting second textile layer to minimize injury to a wearer.

[0095] In some embodiments, the heat reactive material may be produced by a method that provides an intimate blend of polymer resin and expandable graphite, without causing substantial expansion of the expandable graphite. Suitable mixing methods include but are not limited to paddle mixer, blending and other low shear mixing techniques. In one method, the intimate blend of polymer resin and expandable graphite particles is achieved by mixing the expandable graphite with a monomer or prepolymer prior to polymerization of the polymer resin. In another method, the expandable graphite may be blended with a dissolved polymer, wherein the solvent in removed after mixing. In another method, expandable graphite is blended with a hot melt polymer at a temperature below the expansion temperature of the expandable graphite and above the melting temperature of the polymer. In methods which provide an intimate blend of polymer resin and expandable graphite particles or agglomerates of expandable graphite, the expandable graphite is coated or encapsulated by the polymer resin prior to expansion of the expandable graphite. In other embodiments, the intimate blend is achieved prior applying the heat reactive material to a substrate.

[0096] The heat reactive material comprises less than or equal to 50 weight percent (wt%), or less than or equal to 40 wt%, or less than or equal to 30 wt% of the expandable graphite based on the total weight of the heat reactive material, and thebalance substantially comprising the polymer resin and flame retardant materials. In other embodiments, the expandable graphite comprises less than or equal to 20 wt%, or less than or equal to 10 wt%, or less than or equal to 5 wt% of the heat reactive material, and the balance substantially comprising the polymer resin and flame retardant materials. Generally, from 5 wt% to 50 wt% of expandable graphite based on the total weight of the heat reactive material, is desired. In some embodiments, desirable flame resistance performance may be achieved with even lower amounts of expandable graphite. Loadings as low as 1 wt% may be useful. Depending on the properties desired and the construction of the resulting laminates, other levels of expandable graphite may also be suitable for other embodiments. Other additives such as pigments, fillers, antimicrobials, processing aids and stabilizers may also be added to the heat reactive material. If present, the other additives are generally present in amounts of less than about 10% by weight, based on the total weight of the heat reactive material.

[0097] The first and second layers of heat reactive material and, more particularly, the polymer resin may function as an adhesive, for example, for attaching or bonding one layer to an adjacent layer. For example, the first layer of heat reactive material may adhere the first textile layer to the carrier layer and the second layer of heat reactive material may adhere the carrier layer to the second textile layer. The first and second layers of heat reactive material may independently be in the form of a discontinuous adhesive, for example, a series of individual dots or shapes that do not touch or overlap one another. In other embodiments, the first and / or the second layers of heat reactive material may be a continuous layer extending across a majority of the length and / or the width of the laminate. In still further embodiments, the first and / or the second layers of heat reactive material may be in the form of a series of lines or grids extending across a majority of the length and / or width of the laminate. The lines or grids may be straight, curved, may be essentially parallel to each other, and / or they may overlap one another. When the first and / or second layers of heat reactive material are applied in a discrete discontinuous manner, the shape of the dot of the heat reactive material may take essentially any form. In some embodiments, the shape may be a circle, an oval, a triangle, a square, a rectangle, a star, a polygon, a four-sided polygon or any otherdiscrete shape. The shape of the first layer of heat reactive material may be chosen independently of that of the shape of the second layer of heat reactive material.

[0098] An amount of the heat reactive material should be applied to adhere each of the first textile layer, the carrier layer and the second textile layer of the laminate and to provide the desired protection from a high energy event. Typically, each of the first and second layers of heat reactive materials are applied so as to provide at least 20 grams per meter2(gsm) of the heat reactive material. In some embodiments, the amount of each of the first and second layer of heat reactive material can independently be in the range of from 20 gsm to about 130 gsm. In other embodiments, the amount of each of the first and second layer of heat reactive material can independently be in the range of from 30 gsm to 120 gsm , or from 40 gsm to 110 gsm , or from 50 gsm to 110 gsm , or from 60 gsm to 110 gsm, or from 70 gsm to 110 gsm.

[0099] CARRIER LAYER

[0100] The laminate comprises a carrier layer that is located between the first and second layers of heat reactive material. The carrier layer can provide the laminate with strength and durability before an exposure to a high energy event that causes expansion of one or more layers of the heat reactive material. The carrier layer can comprise polyethylene. Prior art laminates comprising the disclosed heat reactive material have utilized a heat stable layer or a thermally stable layer laminated to a meltable layer in order to provide strength after exposure to a high energy event, that is, the thermally stable layer maintained structural integrity after the exposure to the high energy event. It is surprising that laminates comprising a layer that is a meltable material or a layer that is thought of as a non-thermally stable layer can be used in the disclosed laminates and still retain at least some of the thermal protection properties required for the laminates that are exposed to high energy events.

[0101] In some embodiments, the carrier layer can comprise a polyethylene membrane. The polyethylene membrane can be a waterproof, breathable polyethylene membrane that has a porous structure. The porous polyethylene membrane comprises a f ibril lated structure of polyethylene fibrils, and with sufficient magnification it is possible to see one or more polyethylene fibrils, optionally three or more of the fibrils that can be interconnected by one or more intersections of the three or more fibrils. Itshould be noted that a porous film having the fibril structure is considered to be different from a textile. In some embodiments, the carrier layer is free from or essentially free from flame retardant or flame resistant additives. In other embodiments, the carrier layer can be a porous film with pores that is at least partially filled with a polymer. In another embodiment the polymer that fills at least a portion of the pores comprises a flame retardant additive.

[0102] Suitable polyethylene membranes can comprise a) greater than or equal to 30% by weight of the porous polyethylene has a weight average molecular weight greater than 500,000 grams / mole (g / mol), wherein the percentage by weight is based on the total weight of the porous polyethylene; b) a porosity of at least 40%; and c) a Gurley number of less than 200 seconds. In some embodiments, the porous polyethylene membrane comprises greater than or equal to 30% by weight of the polyethylene having a weight average molecular weight of greater than 750,000 g / mol. In still further embodiments, the porous polyethylene membrane comprises greater than or equal to 30% by weight of the polyethylene having a weight average molecular weight of greater than 1 .0x106g / mol. In still further embodiments, greater than or equal to 40% by weight of the polyethylene has a weight average molecular weight of greater than 500,000 g / mol or greater than or equal to 50% by weight of the polyethylene has a weight average molecular weight of greater than 500,000 g / mol. All of the percentages by weight are based on the total weight of the porous polyethylene membrane. In some embodiments, the porous polyethylene membrane has a weight average molecular weight of greater than 750,000 g / mol. In still further embodiments, the porous polyethylene has a weight average molecular weight of greater than 1 ,000,000 g / mol. In still further embodiments, the polyethylene membrane has a weight average molecular weight of greater than 1 ,500,000 g / mol or greater than to 1 ,750,000 g / mol. In still further embodiments, the polyethylene has a weight average molecular weight of greater than 2,000,000 g / mol, 3,000,000 g / mol, 4,000,000 g / mol, 5,000,000 g / mol or greater than 6,000,000 g / mol or greater than 7,000,000 g / mol or greater than 8,000,000 g / mol.

[0103] The porous polyethylene membrane is a porous polyethylene membrane wherein the membrane has a porosity of at least 40%. In some embodiments, theporosity of the porous polyethylene membrane can be at least 50% or at least 60% or at least 70% or at least 80%. The porosity can be calculated using the porosity test described herein. The porous polyethylene membrane can also have a Gurley of less than 200 seconds or less than 100 seconds or less than or equal to 90 seconds or less than or equal to 80 seconds or less than or equal to 70 seconds or less than or equal to 60 seconds or less than or equal to 50 seconds or less than or equal to 40 seconds or less than 10 seconds.

[0104] The porous polyethylene membrane can have a relatively light weight, for example, less than or equal to 10 grams per meter2(gsm). In other embodiments, the porous polyethylene membrane can have a weight of less than or equal to 9 gsm or less than or equal to 8 gsm or less than or equal to 7 gsm or less than or equal to 6 gsm or less than or equal to 5 gsm or less than or equal to 4 gsm or less than or equal to 3 gsm or less than or equal to 2 gsm.

[0105] The polyethylene film can also comprise a hydrophilic polymer that fills at least a portion of the pores of the porous polyethylene membrane. The phrase “filling at least a portion of the pores” means that the hydrophilic polymer is imbibed into the pores of the polyethylene membrane and fills the pores to the point that no airflow (a Gurley number of greater than or equal to 1000 seconds) can be determined through the area of the film containing the hydrophilic polymer. In other words, the hydrophilic polymer is not simply a coating on the walls of the polyethylene membrane that define the pores.While some voids may be present, it is thought that the hydrophilic polymer forms a continuous layer within the area of the porous polyethylene membrane to which the hydrophilic polymer is applied. In other embodiments, the hydrophilic polymer forms a continuous layer free from or essentially free from any voids within the area of the porous polyethylene membrane to which the hydrophilic polymer is applied. In still further embodiments, substantially all of the pores of the porous polyethylene membrane are filled with the hydrophilic polymer.

[0106] The polyethylene membrane has a first side and a second side. The hydrophilic polymer can be applied to the first side of the porous polyethylene membrane and the hydrophilic polymer can permeate at least a portion of the pores to form the polyethylene film, resulting in filling at least a portion of the pores of the polyethylene 1membrane. The first side of the polyethylene membrane can comprise a cap layer of the hydrophilic polymer on the exterior of the membrane. The cap layer or amount of the hydrophilic polymer on the first side of the porous polyethylene membrane has essentially no upper limit. However, if the cap layer is too thick, then the beneficial properties of the porous polyethylene membrane cannot be realized, therefore, the upper limit of the cap is about 50 micrometers. In some embodiments, the cap layer of the hydrophilic polymer can be up to 40 micrometers or up to 30 micrometers or up to 20 micrometers or up to 15 micrometers thick on the first surface of the polyethylene membrane. In some embodiments, the cap layer of the hydrophilic polymer can be up to about 10 micrometers thick on the first surface of the polyethylene membrane. In other embodiments, the cap layer on the first side of the polyethylene membrane is less than or equal to 10 micrometers thick, or less than or equal to 8 micrometers or less than or equal to 6 micrometers or less than or equal to 4 micrometers or less than or equal to 2 micrometers. In still further embodiments, no cap layer of the hydrophilic polymer is present on the first surface of the polyethylene membrane. The second side of the polyethylene membrane can be essentially free from any of the hydrophilic polymer on the surface, for example, no hydrophilic polymer of a thickness more than 1 micrometer above the surface of the polyethylene membrane. In some embodiments, less than the entire thickness of the porous polyethylene membrane is filled with the hydrophilic polymer, for example, less than or equal to 90% of the thickness of the polyethylene membrane may be filled with the hydrophilic polymer, with the proviso that enough hydrophilic polymer is imbibed so as to provide the porous polyethylene film with a Gurley number of greater than or equal to 1000 seconds. In other embodiments, essentially the entire thickness of the porous polyethylene membrane is filled with the hydrophilic polymer. As used herein, the phrase “essentially the entire thickness” means that at least 90% of the thickness of the porous polyethylene membrane is filled with the hydrophilic polymer. In other embodiments, a hydrophilic polymer can be applied to the second side of the polyethylene membrane as well as the first side. The hydrophilic polymer applied to the second side may be the same or different from the hydrophilic polymer applied to the first side. In still further embodiments, the polyethylene film can be a composite film wherein a hydrophilic polymer is applied to afirst side of a first porous polyethylene membrane with a sufficient amount of the hydrophilic polymer applied to the first side of the porous polyethylene membrane so as to form a cap layer and a second porous polyethylene membrane that may be the same or different as the first porous polyethylene membrane, is thereafter bonded to the laminate via the cap layer of the hydrophilic polymer. This can result in a 3-layer composite film having 2 porous polyethylene membranes adhered to one another with the hydrophilic polymer as the layer in between the two porous polyethylene membranes. If desired, an additional layer or layers of hydrophilic polymer may be applied to one or both of the exterior sides of the composite film.

[0107] In some embodiments, the hydrophilic polymer may be applied to the porous polyethylene membrane in a continuous manner, so that essentially 100 percent of the surface area of the porous polyethylene membrane comprises the hydrophilic polymer. As used in this context, the term “continuous” means that the full width or nearly the full width of the porous polyethylene membrane is coated with the hydrophilic polymer. It should be noted that in many coating processes, the edges of a roll of material may not be coated due to frames or dams at the edges not allowing the entire width of the membrane to be coated. In other embodiments, the hydrophilic polymer may be applied to the porous polyethylene membrane in a discontinuous manner. As used in this context, the term “discontinuous” means that less than 100 percent of the surface area of the porous polyethylene membrane is coated with the hydrophilic polymer and that portions of the non-edge areas of the porous polyethylene membrane do not contain the hydrophilic polymer. For example, a hydrophilic polymer applied to the porous polyethylene membrane as a series of dots or as a grid of orthogonal lines are to be considered as discontinuous coatings. The area percent of the porous polyethylene membrane that is filled with the hydrophilic polymer can be in the range of from greater than or equal to 20 percent to 100 percent or from 30 percent to less than 100 percent or from 40 percent to less than 100 percent or from 50 percent to less than 100 percent or from 60 to less than 100 percent or from 70 to less than 100 percent or from 80 to less than 100 percent or from 90 to less than 100 percent. In other embodiments, the application of the hydrophilic polymer can be done in a manner that produces a random or non-random pattern of dots, polygons, parallel lines, intersecting lines, straight lines,curved lines or any combination thereof in order to provide the desired percent by area coverage. If oleophobicity is desired in such films, it may be desirable in certain embodiments to include an oleophobic coating, as described otherwise herein.

[0108] As a weight ratio, the polyethylene film can have a ratio of the weight of the hydrophilic polymer to the weight of the porous polyethylene membrane in the range of from 30.0 to 0.5. In other embodiments, the weight ratio of the hydrophilic polymer to the polyethylene membrane can be 20.0, 15.0, 10.0, 9.0, 8.0, 7.0, 6.0, 5.0, 4.0, 3.0, 2.0, 1 .0, 0.9, 0.8, 0.7, 0.6, 0.5 or any weight ratio in between those numbers.

[0109] Suitable hydrophilic polymers can include, for example, polyurethane, polyamide, polyester, polyether, ionomer, or a copolymer or a combination thereof. In other embodiments, nearly any suitable hydrophilic polymer could be used provided that the hydrophilic polymer is capable of having a moisture vapor transmission rate of greater than or equal to 5,000 grams / meter2 / day or greater than or equal to 10,000 grams / meter2 / day or greater than or equal to 15,000 grams / meter2 / day or greater than or equal to 20,000 grams / meter2 / day or greater than or equal to 25,000 grams / meter2 / day. The hydrophilic polymer can be a thermoplastic or a crosslinkable polymer. In some embodiments, the hydrophilic polymer is a polyurethane and in further embodiments, the polyurethane is a crosslinked polyurethane. Suitable polyurethane polymers can be, for example, polyesterurethanes, polyetherurethanes or polyether-polyesterurethanes.

[0110] In some embodiments where coloring is desired, the color can be add using, for example, a pigmented hydrophilic polymer wherein pigments or dyes have been added to the hydrophilic polymer, resulting in a film having the desired color. In other embodiments, the porous polyethylene film can be colored during the formation of the porous polyethylene membrane according to known methods, for example, masterbatching. Therefore, one or both of the porous polyethylene membrane and the hydrophilic membrane can be colored or uncolored. If both the porous polyethylene and the hydrophilic polymer are colored, they can be colored in the same or a similar shade or the colors can be chosen independently of one another. Any of the known pigments or dyes can be used, including organic pigments and dyes, inorganic pigments or dyes, metals, metal oxides, carbon black, titanium dioxide or combinations thereof.

[0111] After the addition of the hydrophilic polymer, the polyethylene film comprising both the porous polyethylene membrane and the hydrophilic polymer can in certain embodiments be undesirably stiff and noisy when flexed. If these stiff and noisy films are used to make a multilayer laminate, the laminate will also be undesirably stiff and noisy when incorporated in, for example, an article of apparel. It has been found that heating the film comprising the polyethylene membrane and the hydrophilic polymer to a temperature above the melting temperature of the polyethylene for a sufficient time, as described in more detail herein, can result in a multilayer laminate having improved hand and reduced noise, when compared to multilayer laminates that have not received this heat treatment process. The temperature required for this heat treatment is at least 125°C. In other embodiments, the temperature required for the heat treatment is at least 130°C. In still further embodiments, the temperature for the heat treatment step is at least 135°C or at least 140°C or at least 145°C or at least 150°C or at least 155°C or at least 160°C or at least 165°C or at least 170 °C or at least 175°C. At temperatures above 200°C and for a sufficient length of time, the heat treatment temperature may begin to decompose the hydrophilic polymer and / or the polyethylene, depending upon the choice of the hydrophilic polymer. The time required for this heat treatment depends on the heating temperature and on the method used for heating, for example, a heating temperature of 125°C may require a longer heating time than the case where the heating temperature is 165°C. The minimum heating time required for a given film and heating process can readily be determined by one skilled in the art, provided that the temperature is high enough to be able to melt at least a portion of the polyethylene. In those regions of the film where the polyethylene membrane structure is surrounded or encased by the hydrophilic polymer, no collapse or coalescence of the polyethylene or macro-scale deformation of the polyethylene membrane occurs upon melting of the polyethylene, and the breathability of the film is surprisingly maintained.

[0112] The resulting polyethylene film comprising the porous polyethylene membrane and the hydrophilic polymer can have a moisture vapor transmission rate (MVTR) of greater than or equal to 2500 grams / meter2 / day (g / m2 / day); a weight of less than 30 grams / meter2and, optionally, a Gurley of greater than or equal to 1000 seconds. In order to be breathable, i.e. , moisture vapor is able to be transported from one side ofthe film to the other without liquid water moving through the film, the MVTR should be greater than or equal to 2500 g / m2 / day. In other embodiments, the film can have an MVTR of greater than or equal to 3000 g / m2 / day, greater than or equal to 3500 g / m2 / day, greater than or equal to 4000 g / m2 / day, greater than or equal to 4500 g / m2 / day, greater than or equal to 5000 g / m2 / day, greater than or equal to 5500 g / m2 / day, greater than or equal to 6000 g / m2 / day, greater than or equal to 6500 g / m2 / day, greater than or equal to 7000 g / m2 / day, greater than or equal to 7500 g / m2 / day, greater than or equal to 8000 g / m2 / day, greater than or equal to 8500 g / m2 / day, greater than or equal to 9000 g / m2 / day, greater than or equal to 9500 g / m2 / day, or greater than or equal to 10,000 g / m2 / day.

[0113] In some embodiments, the carrier layer comprises a polyethylene film, wherein the polyethylene film is a porous polyethylene membrane with at least a portion of the pores of the porous polyethylene membrane filled with a hydrophilic polymer. Useful porous polyethylene films that can be used as the carrier layer are described in International Patent Application Publication No. W02020 / 028328 to W.L. Gore and Associates, Inc. or International Patent Application Publication No. W02020 / 028331 to W.L. Gore and Associates, Inc., both of which are incorporated herein by reference in their entirety.

[0114] In some embodiments, as exemplified by Figure 1 , the laminate (10) comprises a first textile layer (20), two layers of heat reactive material (30) and (30’), a carrier layer (40), and a second textile layer (50).

[0115] The carrier layer may also comprise antistatic agents, antistatic particles, antistatic polymers, or antistatic fibers as a filler or as a coating. Suitable antistatic agents, particles or polymers can comprise, for example, carbon black, conductive fibers, metal particles, or electrically conductive polymers.

[0116] SECOND TEXTILE LAYER

[0117] The laminate further comprises a second textile layer that is adjacent to the second layer of heat reactive material on the opposite side from that of the carrier layer. The second textile layer forms one of the outer layers of the laminate and is on the opposite side of the first textile layer. Therefore, the laminate has two ‘outer’ layers, the first textile layer and the second textile layer, with the two layers of heat reactivematerial and the carrier layer forming the ‘inner’ layers of the laminate. When the laminate is formed into an article, for example, a garment, the first textile layer is intended to be an outer layer of the garment and the second textile layer is intended to be an inner layer of the garment. However, because the laminate is a 3-layer laminate with adhesive layers (the first and second heat reactive material layers) connecting the 3-layers (first textile layer, carrier layer and second textile layer), in certain embodiments, the second textile layer may be used as an outer layer and the first textile layer may be an inner layer of the garment.

[0118] The second textile layer can be any single layer or multilayer textile that is commonly used in the textile industry. Suitable fibers, filaments or yarns can comprise nylon, nylon 6, nylon 6.6, nylon 12, nylon 6.12, polyester, polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyurethane, elastane, acrylic, polyolefin, polyethylene, polypropylene, aramids, meta-aramids, para-aramids, NOMEX® aramid, KEVLAR® aramid, TWARON® aramid, polyamide-imides, polybenzimidazole (PBI), polybenzoxazole (PBO), FR viscose, FR cotton, modacrylic, polyamine, carbon fiber, fiberglass, polyacrylonitrile (PAN), PTFE, viscose, rayon, cotton, wool, silk, cellulose, jute, flax, bamboo, hemp or a combination thereof. The fibers and / or filaments can be combined using known methods to form yarns. A yarn can be produced from a single type of fiber or filament, or the yarn may be produced from a blend of two or more different types of fibers or filaments. Similarly, the second textile layer may be formed from a single type of fibers, filaments, and / or yarns or from multiple different fibers, filaments and / or yarns to provide the desired textile properties. The textiles can be woven, knits or nonwoven textiles. In some embodiments, the second textile layer is free from or essentially free from flame retardant or flame resistant additives.

[0119] In any of the previous embodiments, the second textile layer can comprise in the range of from 0% to 100% meltable fibers, based on the total weight of the meltable and nonmeltable fibers in the second textile layer. In other embodiments, the second textile layer can comprise in the range of from greater than 0% to 100% meltable fibers, or from 0.5% to 100% meltable fibers, or from 1% to 100%, or from 1 % to 99% meltable fibers, or from 3% to 100% meltable fibers, or from 5% to 100% meltable fibers, or from10% to 100% meltable fibers, or from 20% to 100% meltable fibers, or from 25% to 100% meltable fibers, or from 30% to 100% meltable fibers, or from 35% to 100% meltable fibers, or from 40% to 100% meltable fibers, or from 50% to 100% meltable fibers, or from 60% to 100% meltable fibers, or from 70% to 100% meltable fibers, or from 80% to 100% meltable fibers, or from 90% to 100% meltable fibers. In other embodiments, the second textile comprises a combination of meltable and nonmeltable fibers in the range of from 1 to 99% nonmeltable fibers and from 1 to 99% meltable fibers. Each of the percentages are based on the total weight of the fibers in the second textile layer.

[0120] In some of the previous embodiments, the second textile layer can comprise a 100% nylon textile. In other embodiments, the second textile layer can be a 100% polyester textile. In other embodiments, the second textile layer can be a cotton textile comprising up to 100% cotton. In other embodiments, the second textile layer can be a wool textile comprising up to 100% wool. In still further embodiments, the second textile layer can comprise a mixture of nylon and cotton, for example in the range of from 30% to 70% nylon and 30% to 70% cotton; or from 40% to 60% nylon and from 40% to 60% cotton or from 30% to 68% nylon, from 30% to 68% cotton and up to about 5% by weight, based on the total weight of the textile of an antistatic additive.

[0121] In another embodiment, the second textile layer may comprise a mixture of polyester and cotton, for example in the range of from 30% to 70% polyester and 30% to 70% cotton; or from 30% to 68% polyester, from 30% to 68% cotton, and up to about 5% by weight, based on the total weight of the textile of an antistatic additive. In some embodiments, the second textile layer can be a textile comprising a mixture of polyester and cotton, for example in the range of from 45 to 90% polyester and from 10 to 55% cotton.

[0122] In another embodiment the second textile layer may comprise a mixture of aramid and flame retardant viscose, for example in the range of from 30 to 68% of an aramid and from 30 to 68% of a flame retardant viscose with up to about 5% by weight, based on the total weight of the textile, of an antistatic additive. In other embodiments, the second textile layer may comprise a mixture of polyamide-imide and viscose, forexample in the range of from 40% to 60% of a polyamide-imide, from 40 to 60% of viscose and 1 to 5% of an anti-static agent.

[0123] In other embodiments, the second textile layer may comprise a mixture of viscose and polyester, for example in the range of from 50 to 70% viscose and from 30 to 50% polyester.

[0124] In some embodiments, the second textile layer can be a flame retardant textile layer comprising one or more flame retardant natural fibers or flame retardant synthetic fibers or filaments. In other embodiments, the second textile can be a textile comprising a meta-aramid or a para-aramid, viscose and nylon. In other embodiments, the second textile layer can be a meltable textile layer. In some embodiments, the first textile layer and the second textile layer comprise meltable textile layers. In some embodiments, the second textile is a textile that is a no-melt and / or no-drip textile according to the melting and thermal stability test as defined herein. In some embodiments, the second textile is a textile that comprises meltable fibers, filaments or yarns and considered to be a no-melt and / or no-drip textile according to the melting and thermal stability test as defined herein.

[0125] In still further embodiments, the laminate comprises a second textile comprising a combination of meltable and nonmeltable fibers in the range of from 1 to 99% nonmeltable fibers and from 1 to 99% meltable fibers. In other embodiments, the second textile layer can comprise in the range of from 5% to 100% meltable fibers, or from 10% to 100% meltable fibers, or from 20% to 100% meltable fibers, or from 25% to 100% meltable fibers, or from 30% to 100% meltable fibers, or from 35% to 100% meltable fibers, or from 40% to 100% meltable fibers, or from 50% to 100% meltable fibers, or from 60% to 100% meltable fibers, or from 70% to 100% meltable fibers, or from 80% to 100% meltable fibers, or from 90% to 100% meltable fibers. Each of the percentages are based on the total weight of the fibers in the second textile layer. In further embodiments, the second textile layer can be a knit, e.g., a nylon knit, a polyester knit, a polyurethane knit or knits containing combinations of one or more nylons, polyesters and / or polyurethanes. A knit construction may provide a relatively lightweight textile that helps to reduce the overall weight of the laminate while still retaining the desired flame resistant and / or arc resistant properties of the laminate. Insome embodiments, the laminate comprises a second textile layer that is free from or essentially free from flame retardant or flame resistant additives. In some embodiments, the second textile layer may be produced from one or more recycled fibers, filaments or textiles.

[0126] The second textile layer may also comprise antistatic agents, antistatic particles, antistatic polymers, or antistatic fibers as a filler or as a coating. Suitable antistatic agents, particles or polymers can comprise, for example, carbon black, conductive fibers, metal particles, or electrically conductive polymers. In some embodiments, the second textile layer can comprise meltable fibers and one or more antistatic agents.

[0127] In some embodiments, the second textile can be a knit or a woven textile comprising a blend of greater than or equal to 20% of an aramid and one or more of viscose, flame retardant viscose, polyester and / or nylon with a textile weight of greater than or equal to 80 grams / square meter (gsm). In other embodiments, the second textile can be a knit or a woven textile comprising a blend of greater than or equal to 20% of an aramid and one or more of viscose, flame retardant viscose, polyester and / or nylon with a textile weight of greater than or equal to 90 gsm; or the second textile can be a knit or a woven textile comprising a blend of greater than or equal to 20% of an aramid and one or more of viscose, flame retardant viscose, polyester and / or nylon with a textile weight of greater than or equal to 100 gsm; or the second textile can be a knit or a woven textile comprising a blend of greater than or equal to 20% of an aramid and one or more of viscose, flame retardant viscose, polyester and / or nylon with a textile weight of greater than or equal to 110 gsm. In other embodiments, the second textile can be a knit or a woven textile comprising a blend of greater than or equal to 23% of an aramid and one or more of viscose, flame retardant viscose, polyester and / or nylon with a textile weight of greater than or equal to 90 gsm; or the second textile can be a knit or a woven textile comprising a blend of greater than or equal to 23% of an aramid and one or more of viscose, flame retardant viscose, polyester and / or nylon with a textile weight of greater than or equal to 100 gsm; or the second textile can be a knit or a woven textile comprising a blend of greater than or equal to 23% of an aramid and one or more of viscose, flame retardant viscose, polyester and / or nylon with a textile weight of greater than or equal to 110 gsm.

[0128] The second textile layer can be a woven, knit or a nonwoven textile. In some embodiments, the second textile is a relatively lightweight textile produced from one or more synthetic fibers, for example, a knit comprising a blend of cotton and polyester. In another embodiments, the second textile layer can be an inherently flame retardant layer comprising flame retardant fibers or filaments. In one embodiment, the second textile layer can be a woven textile comprising a blend of aramid, flame retardant viscose and an anti-static additive. The second textile layer is lightweight, having a weight less than or equal to 200 grams / square meter (gsm), e.g., less than 200 gsm, less than 190 gsm, less than 180 gsm, less than 170 gsm, less than 160 gsm, less than 150 gsm, less than 140 gsm, less than 130 gsm, less than 125 gsm, less than 120 gsm, less than 110 gsm, less than 100 gsm, less than 90 gsm or less than 85 gsm. In order for the second textile layer to have sufficient strength and durability, the textile weight should be greater than or equal to 15 gsm, or greater than or equal to 20 gsm, or greater than or equal to 25 gsm, or greater than or equal to 30 gsm, or greater than or equal to 35 gsm, or greater than or equal to 40 gsm, or greater than or equal to 45 gsm, or greater than or equal to 50 gsm, or greater than or equal to 55 gsm. It should be noted that with increasing amounts of nonmeltable fibers, the weight of the textile generally needs to be higher in order to have a second textile layer with adequate durability, strength, and abrasion-resistance. For example, with a 50 / 50 nylon / cotton blend, the textile weight should be in the range of 120 to about 150 gsm.

[0129] In some embodiments, as exemplified by Figure 1 , the laminate (10) comprises a first textile layer (20), two layers of heat reactive material (30) and (30’), a carrier layer (40), and a second textile layer (50). In a further embodiment, as exemplified in Figure 2, the laminate (10) may comprise a first textile layer (20), a carrier layer (40) that may be a porous polyethylene layer (42), two layers of heat reactive material (30) and (30’), and a second textile layer (50). The carrier layer (40) comprises porous polyethylene layer (42, shown as a dark colored rectangle) and hydrophilic layer (42, shown as cross- hatched pattern) which may form a cap layer (45) on one side of the polyethylene layer. While Figure 2 shows the cap layer oriented toward the direction of the second textile layer (50), in other embodiments, the cap layer can be oriented toward the first textile layer (20). The polymer layer (44) may be waterproof or air impermeable or both. Thepolymer layer (44) may be a polyurethane or a layer of polyurethane that contains one or more flame retardant agents.

[0130] As discussed above, in some embodiments, the laminate (10) may also include a protective layer positioned between the first textile layer (20) and the carrier layer (40). In such embodiments, the protective layer may be positioned to either side of the layer of heat reactive material (30) (e.g., may be positioned either between the first textile layer (20) and the layer of heat reactive material (30), or between the layer of heat reactive material (30) and the carrier layer (40). In such embodiments, due to the relatively open structure of the protective layer as described above, the heat reactive material (30) is able to adhere the first textile layer (20) to the carrier layer (40) through the material of the protective layer.

[0131] ADDITIONAL LAYERS

[0132] One or more additional layers can be adhered to the laminates (10), wherein the additional layers are adhered to the first textile layer (20), to the second textile layer (50), or both. If the one or more additional layers are adhered to the first textile layer (20), then the one or more additional layers are chosen from the list of materials that are described as useful for the first textile layer (20). If the one or more additional layers are adhered to the second textile layer (50), then the one or more additional layers can be chosen from the list of materials that are described as useful for the second textile layer (50). The one or more additional layers can be adhered to the laminate using a known lamination adhesive, using one or more additional layers of the heat reactive material (30 and 30’) described herein or by any other conventional technique, for example, stitching, quilting, gluing, hook and loop fasteners, buttons, snaps or a combination thereof.

[0133] For example, with reference to Figures 1 and 2, in some embodiments, at least one additional layer of the heat reactive material (30) and at least one additional textile layer including a material chosen from the list of materials described as useful for the first textile layer (20) are applied to first textile layer (20) by utilizing the additional layer of the heat reactive material (30) to adhere the at least one additional textile layer to the first textile layer (20). Similarly, in some embodiments, at least one additional layer of the heat reactive material (30’) and at least one additional textile layer including amaterial chosen from the list of materials described as useful for the second textile layer (50) are applied to second textile layer (50) by utilizing the additional layer of the heat reactive material (30’) to adhere the at least one additional textile layer to the second textile layer (50). In such embodiments in which more than one additional layer is included, each subsequent additional layer is positioned adjacent to the textile layer. For example, in some embodiments, additional layers positioned on the first textile layer (20) may include, in layered order, the first textile layer (20), a first additional layer of the heat reactive material (30), a first additional textile layer, a second additional layer of the heat reactive material (30), a second additional textile layer, etc.

[0134] APPLICATION OF FIRST AND SECOND LAYERS OF HEAT REACTIVE MATERIAL

[0135] The first layer of heat reactive material may be applied to the carrier layer, to the first textile layer or to both. The second layer of heat reactive material can be applied to the carrier layer (on a side opposite the first layer of heat reactive material), to the second textile layer or to both. In some embodiments, the first and / or second layer of heat reactive material may be applied as a continuous layer. However, in embodiments where increased breathability and / or lower hand is desired, the first and / or second layer of heat reactive material may be applied discontinuously to form a layer of heat reactive material having less than 100% surface coverage. A discontinuous application providing less than 100% surface coverage may take a variety of forms including, but not limited to, dots, grids, lines or a combination thereof. In some embodiments with discontinuous coverage, the average distance between adjacent areas of the discontinuous pattern is less than 5 millimeters (mm), or preferably less than 3.5 mm, 2.5 mm, 1 .5 mm, or 0.5 mm. The average distance between adjacent areas can be measured by measuring the edge-to-edge spacing between adjacent dots. In embodiments where properties such as hand, breathability, and / or laminate weight are important, a surface coverage of less than 90%, or less than 80%, or less than 70%, or less than 60%, or less than 50%, or less than 40%, or less than 30% may be used. In some embodiments, the first layer of heat reactive material covers greater than or equal to 25% of a surface of the first textile layer. In some embodiments, the second layer of heat reactive material covers greater than or equal to 25% of a surface of the secondtextile layer. The percent coverage may be calculated by measuring the geometry of the gravure cell or screen printing masks, depending on which application method is used. One method for achieving a coverage of less than 100% comprises applying the heat reactive material by printing the heat reactive material onto a surface of the first textile layer or a surface of the carrier layer by, for example, gravure printing. Figures 3A and 3B illustrate examples in which the layer of heat reactive material (330) is provided in discontinuous patterns of dots (FIG 3A) and grids (FIG 3B) to a layer, for example, the first textile layer (320). Each individual layer of the heat reactive material may be applied at a rate to achieve an add-on weight of between 20 gsm to 120 gsm of the heat reactive material. In some embodiments, a layer of the heat reactive material can be applied at a rate to achieve an add-on weight of less than 120 gsm, or less than 100 gsm, or less than 90 gsm, or less than 80 gsm. The add-on weight can be determined by weighing identical sized samples of the layer before and after the heat reactive material is applied and normalizing the size of the sample to one square meter.

[0136] In some embodiments, the process of forming a laminate comprising the first textile layer, the carrier layer, the second textile layer and the two layers of heat reactive material may be accomplished in a step-wise process, while in other embodiments, in a continuous process. In some embodiments, a step-wise process may include the step of forming a precursor laminate comprising the second textile layer, the carrier layer and the second layer of heat reactive material adhering the second textile layer and carrier layer together. In this step-wise process, a layer of the second heat reactive material may be applied in a continuous or a discontinuous manner to the second textile layer, to the carrier layer or to both the second textile layer and the carrier layer. The second textile layer and the carrier layer can then be adhered using any of the known lamination techniques, for example, using calender rolls to form a precursor laminate. The precursor laminate can be used directly as it is or can be stored for several minutes to days or months until needed. Following the formation of the precursor laminate, the first textile layer can then be applied. In this step, the first layer of heat reactive material can be applied in a continuous or a discontinuous manner to the first textile layer, to the carrier layer side of the precursor laminate, or to both, followed by adhering the firsttextile layer to the precursor laminate (on the carrier layer side), for example, using two or more calender rolls.

[0137] In other embodiments, the process of forming a laminate comprising the first textile layer, the carrier layer, the second textile layer and the two layers of heat reactive material may be accomplished in a step-wise process, wherein the precursor laminate comprises the first textile layer, the first layer of heat reactive material and the carrier layer. In these embodiments, a layer of the first heat reactive material may be applied in a continuous or a discontinuous manner to the first textile layer, to the carrier layer or to both the first textile layer and the carrier layer. The first textile layer and the carrier layer can then be adhered using any of the known lamination techniques, for example, using calender rolls to form the precursor laminate. The precursor laminate can be used directly as it is or can be stored for several minutes to days or months until needed. Following the formation of the precursor laminate, the second textile layer can then be applied. In this step, the second layer of heat reactive material can be applied in a continuous or a discontinuous manner to the second textile layer to the carrier layer side of the precursor laminate or to both, followed by adhering the second textile layer to the precursor laminate (on the carrier layer side), for example, using calender rolls. The step-wise processes as described herein can be performed in one facility, or multiple facilities, optionally in different locations. For example, the precursor laminate may be formed in one facility and transported to a second facility to form the laminate.

[0138] In other embodiments, a continuous lamination process can be used, wherein the first layer of heat reactive material can be applied to the first textile layer, to the carrier layer, or to both, the second layer of heat reactive material can be applied to the second textile layer to the carrier layer or to both, and in one or more lamination steps, the layers are adhered together wherein the first textile layer and the second textile layer form the outermost layers of the laminate and the carrier layer forms an inner layer between the outermost layers. In some embodiments, the first and second layers of heat reactive material act as an adhesive, adhering the laminate layers together.

[0139] In some embodiments, a method for forming the laminate comprises i) adhering the first textile layer to the carrier layer with a layer of the first heat reactive material to form a precursor laminate; and ii) adhering the precursor laminate to the second textilelayer with a layer of the second heat reactive material. In other embodiments, a method for forming the laminate comprises i) adhering the second textile layer to the carrier layer with a layer of the second heat reactive material to form a precursor laminate; and ii) adhering the precursor laminate to the first textile layer with a layer of the first heat reactive material.

[0140] The first and second layers of heat reactive material are separated from each other by the carrier layer. When the first and second layers of heat reactive material are in a discontinuous form, for example, in the form of a series or array of dots, then a dot of the first layer of heat reactive material applied to one side of the carrier layer may be fully aligned, partially aligned or may not be aligned at all with a corresponding dot of the second layer of heat reactive material applied to the opposite side of the carrier layer. As used herein, fully aligned means that less than or equal to 10% of the surface area of a dot of the first layer of the heat reactive material is out of alignment with the corresponding surface area of a dot of the second layer of heat reactive material. As used herein, dots of the first and second layer of heat reactive material are said to be unaligned when less than or equal to 10% of the surface area of a dot of the first layer of heat reactive material aligns with the surface area of a corresponding dot of the second layer of heat reactive material. The dots of first and second layers of heat reactive material are said to be partially aligned when greater than 10% to less than 90% of the surface area of a dot of the first layer of heat reactive material extends beyond the surface area of a corresponding dot of the second layer of heat reactive material.

[0141] Figure 4 shows illustrative examples of aligned, partially aligned, and unaligned dots of the heat reactive materials. Figure 4 shows carrier layer (40) with dots of first layer of heat reactive material (31a), (32a) and (33a) on a first surface (40a) of the carrier layer (40) and dots of the second heat reactive material (31 b), (32b) and (33b) shown on the second surface (40b) of the carrier layer (40). Heat reactive material (31 b) is an example of an unaligned dot, when compared to the corresponding dot of the heat reactive material (31 a). Heat reactive material (32b) is an example of a partially aligned dot, when compared with the corresponding dot of the heat reactive material (32a). Heat reactive material (33b) is an example of an aligned dot, whencompared with the corresponding dot of heat reactive material (33a). While not wishing to be bound by theory, it is believed that the breathability and the moisture vapor transmission rate (MVTR) can be increased by increasing the alignment between the dots or lines of the first and second heat reactive materials.

[0142] In some embodiments, the first and second layers of heat reactive material are applied in a discontinuous manner having the form of a discrete shape, wherein at least a portion of the discrete shapes of the first layer of heat reactive material are at least partially aligned with a corresponding discrete shape of the second layer of heat reactive material. In other embodiments, the first and second layers of heat reactive material are applied in a discontinuous manner having the form of a discrete shape, wherein at least a portion of the discrete shapes of the first layer of heat reactive material are aligned with a corresponding discrete shape of the second layer of heat reactive material. In still further embodiments, the first and second layers of heat reactive material are applied in a discontinuous manner having the form of a discrete shape, wherein at least a portion of the discrete shapes of the first layer of heat reactive material are unaligned with a corresponding discrete shape of the second layer of heat reactive material. In still further embodiments, the first and second layers of heat reactive material are applied in a discontinuous manner having the form of a discrete shape, wherein the discrete shapes of the first layer of heat reactive material comprise a mixture of aligned, partially aligned and unaligned shapes when compared to the corresponding discrete shapes of the second layer of heat reactive material.

[0143] In some embodiments, the laminate has a weight of less than or equal to 500 grams / meter2(gsm). In other embodiments, the laminates have a weight of less than or equal to 450 gsm, or less than or equal to 425 gsm or less than or equal to 400 gsm, or less than or equal to 375 gsm, or less than or equal to 350 gsm, or less than or equal to 325 gsm.

[0144] The laminates described herein can provide a lightweight laminate that can provide protection against an electric arc as measured by IEC 61482-2 in the Electric Arc Box test (IEC 61482-1 -2:2014) and / or the Open Arc Test (IEC 61482-1-1 :2009, method A). In some embodiments, the laminates described herein complies with the standards IEC 61482-1 -1 :2014 and / or IEC 61482-1-2:2014 and has a weight of lessthan or equal to 500 gsm. In some embodiments, the laminates described herein complies with the standards IEC 61482-1-1 :2014 and / or IEC 61482-1-2:2014 and has a weight of less than or equal to 475 gsm. In some embodiments, the laminates described herein complies with the standards IEC 61482-1-1 :2014 and / or IEC 61482-1 - 2:2014 and has a weight of less than or equal to 450 gsm. In some embodiments, the laminates described herein complies with the standards IEC 61482-1 -1 :2014 and / or IEC 61482-1 -2:2014 and has a weight of less than or equal to 425 gsm. In some embodiments, the laminates described herein complies with the standards IEC 61482- 1 -1 :2014 and / or IEC 61482-1 -2:2014 and has a weight of less than or equal to 400 gsm. In some embodiments, the laminates described herein complies with the standards IEC 61482-1 -1 :2014 and / or IEC 61482-1-2:2014 and has a weight of less than or equal to 375 gsm. In some embodiments, the laminates described herein complies with the standards IEC 61482-1-1 :2014 and / or IEC 61482-1-2:2014 and has a weight of less than or equal to 350 gsm. In some embodiments, the laminates described herein complies with the standards IEC 61482-1-1 :2014 and / or IEC 61482-1 - 2:2014 and has a weight of less than or equal to 325 gsm. In some embodiments, the laminates described herein complies with the standards IEC 61482-1 -1 :2014 and / or IEC 61482-1 -2:2014 and has a weight of less than or equal to 300 gsm. In some embodiments, the laminates described herein complies with the standards IEC 61482- 1 -1 :2014 and / or IEC 61482-1 -2:2014 and has a weight of less than or equal to 275 gsm. In some embodiments, the laminates described herein complies with the standards IEC 61482-1 -1 :2014 and / or IEC 61482-1-2:2014 and has a weight of less than or equal to 265 gsm. In some embodiments, the laminates described herein complies with the standards IEC 61482-1-1 :2014 and / or IEC 61482-1-2:2014 and has a weight of less than or equal to 250 gsm.

[0145] USES

[0146] Laminates as described herein can be useful to make protective articles. The protective articles can include, for example, garments such as shirts, jackets, pants, coveralls, overalls, aprons, hats, gloves and footwear; covers, blankets, tents and more. In each of these applications, the laminate should be oriented such that the meltable layer faces the potential threat. For example, wherein the laminate is used to form ajacket, the first textile layer should be oriented to face the outer portion of the jacket and the second textile layer is closer to a wearer so that in the event of exposure to a high energy or high temperature event, the first textile layer is exposed to the energy before the second textile layer.EXAMPLES

[0147] Weight Average Molecular Weight Determination

[0148] Molecular weight determinations were performed according to the procedures given by Mead, D. W., Determination of Molecular Weight Distributions of Linear Flexible Polymers from Linear Viscoelastic Material Functions, Journal of Rheology 1994, 38(6): 1797-1827.

[0149] Porosity

[0150] Porosity was expressed as a percent porosity and was determined by subtracting the quotient of the average density of the porous polyethylene membrane and that of the true density of the polymer from 1 , then multiplying that value by 100. For the purposes of this calculation, the true density of polyethylene was taken to be 0.94 grams / cubic centimeter. The density of the sample was calculated by dividing the mass / area of a sample by its thickness.

[0151] Gurley

[0152] The Gurley air flow test measures the time it takes in seconds for 100 cm3of air to flow through a 6.45 cm2sample at 12.4 cm of water pressure. The samples were measured in a Gurley Densometer Model 4110 Automatic Densometer equipped with a Gurley Model 4320 automatic digital timer. The reported results are the average of multiple measurements.

[0153] Melting and Thermal Stability TestThe test was used to determine the thermal stability of textile materials. This test was based on thermal stability test as described in section 8.3 of NFPA 1975, 2004 Edition. The test oven was a hot air circulating oven as specified in ISO 17493. The test was conducted according to ASTM D 751 , Standard Test Methods for Coated Fabrics, using the Procedures for Blocking Resistance at Elevated Temperatures (Sections 89 to 93), with the following modifications:

[0154] Borosilicate glass plates measuring 100 millimeters (mm) x 100 mm x 3 mm (4 inches (in) x 4 in x 1 / 8 in) were used; and

[0155] An internal oven test temperature of 280°C ± 5°C was used. The specimens were allowed to cool a minimum of 1 hour after removal of the glass plates from the oven.

[0156] Any sample side sticking to the glass plate, sticking to itself when unfolded or showing evidence of melting or dripping was considered as meltable. Any sample lacking evidence of melting was then retested (using a new sample of the material) at an internal oven test temperature of 300°C. After removal from the oven and cooling for 1 hour, any sample side sticking to the glass plate, sticking to itself when unfolded or showing evidence of melting or dripping was considered as meltable. Any sample not showing one of these melting criteria was considered to be a no-melt sample and / or a no-drip sample (i.e. , a sample of a no-melt textile and / or a no-drip textile).

[0157] TMA Expansion test:TMA (Thermo-mechanical analysis) was used to measure the expansion of expandable graphite particles. Expansion was tested with TA Instruments TMA 2940 instrument. A ceramic (alumina) TGA pan, measuring roughly 8mm in diameter and 12mm in height was used for holding the sample. Using the macro-expansion probe, with a diameter of roughly 6mm, the bottom of the pan was set to zero. Flakes of expandable graphite about 0.1 -0.3mm deep, as measured by the TMA probe applying a compressive load of 0.005 N, were placed in the pan. The furnace was closed, and initial sample height was measured. The furnace was heated from about 25°C to 600°C at a ramp rate of 10°C / min. The TMA probe displacement was plotted against temperature; the dimension change normalized for the initial sample height was used as a measure of expansion.

[0158] DSC Endotherm Test:Tests were run on a Q2000 DSC from TA Instruments using TZERO T™ hermetic pans. For each sample, about 3 milligrams (mg) of expandable graphite were placed in the pan. The pan was vented by pressing the corner of a razor blade into the center, creating a vent that was approximately 2 mm long and less than 1 mm wide. The DSCwas equilibrated at 20°C. Samples were then heated from 20°C to 400°C at 10°C / min. Endotherm values were obtained from the DSC curves.

[0159] Weight:Weight measurements on materials were conducted as specified in ASTM D751 , section 10. The units given are in grams per square meter.

[0160] Electric Arc Box Tests were performed using IEC 61482-1 -2:2014.

[0161] The electric arc box test provides information about the performance of the material relative to the Stoll curve, a result of “below” means that the material passes that portion of the test, while a result of “above” means that material failed the test. The box test also provides a measure of the burn time (pass <5 seconds, fail >5 seconds); hole formation (tested material passes this part of the test with no hole larger than 5mm); and an overall pass / fail designation.

[0162] Open arc test was performed according to IEC 61482-1-1 :2009, method A.

[0163] The data is provided as the Arc Thermal Performance Value and is provide in units of calories per square centimeter (cal / cm2).

[0164] Furnace Expansion Test

[0165] A nickel crucible was heated in a hot furnace at 300°C for 2 minutes. A measured sample (about 0.5 g) of expandable graphite was added to the crucible and placed in the hot furnace at 300°C for 3 minutes. After the heating period, the crucible was removed from the furnace and allowed to cool and then the expanded graphite was transferred to a measuring cylinder to measure expanded volume. The expanded volume was divided by the initial weight of the sample to get expansion in cc / g units.

[0166] Air Permeability Test:To test the air permeability of a carrier film layer after thermal exposure, a 381 mm (15 in.) square specimen was clamped in a metal frame and then suspended in a forced aircirculating oven set to a temperature of 260°C. Following a 5-minute exposure, the specimen was removed from the oven. After allowing the specimen to cool down, the air permeability of the specimen was tested according to test methods entitled ISO 9237 (1995).

[0167] Vertical Flame Test

[0168] Testing was performed in accordance with the ASTM D6413. Samples were exposed to flame for 12-seconds. After-flame time was averaged for 3 samples. Laminates with after-flame of greater than 2 seconds were considered as flammable. Char length was also determined by this test. Samples were tested in both the warp and weft directions.

[0169] Horizontal flame Test

[0170] Procedure was followed according to ISO 15025 and the tests were performed on the face side and separately on the back side of the laminate. The test provided information on afterflame and the duration in seconds (if any); afterglow; hole formation; the presence of flaming debris; and the presence of flaming to the upper or vertical edge of the material.

[0171] Moisture Vapor Transmission Rate (MVTR)

[0172] A description of the test employed to measure moisture vapor transmission rate (MVTR) is given below. The procedure has been found to be suitable for testing films, coatings, and coated products.

[0173] In the procedure, approximately 70 ml of a solution consisting of 35 parts by weight of potassium acetate and 15 parts by weight of distilled water are placed into a 133 ml polypropylene cup, having an inside diameter of 6.5 cm at its mouth. An expanded polytetrafluoroethylene (PTFE) membrane having a minimum MVTR of approximately 85,000 g / m2 / 24 hrs. as tested by the method described in U.S. Patent 4,862,730 (to Crosby), is heat sealed to the lip of the cup to create a taut, leakproof, porous barrier containing the solution.

[0174] A similar expanded PTFE membrane is mounted to the surface of a water bath. The water bath assembly is controlled at 23°C plus 0.2°C, utilizing a temperature controlled room and a water circulating bath.

[0175] The sample to be tested is allowed to condition at a temperature of 23°C and a relative humidity of 50% prior to performing the test procedure. Samples are placed so the porous polymeric membrane is in contact with the expanded polytetrafluoroethylene membrane mounted to the surface of the water bath and allowed to equilibrate for at least 15 minutes prior to the introduction of the cup assembly.

[0176] The cup assembly is weighed to the nearest 1 / 1000g and placed in an inverted manner onto the center of the test sample.

[0177] Water transport is provided by the driving force between the water in the water bath and the saturated salt solution providing water flux by diffusion in that direction. The sample is tested for 15 minutes, and the cup assembly is then removed, weighed again within 1 / 1000g. The MVTR of the sample is calculated from the weight gain of the cup assembly and is expressed in grams of water per square meter of sample surface area per 24 hours.

[0178] Edge Ignition Test

[0179] The edge ignition test was performed according to ISO 11612. This test provided information on afterflame and the duration in seconds (if any); afterglow; hole formation; the presence of flaming debris; and the presence of flaming to the upper or vertical edge of the material.

[0180] Heat Reactive Material 1

[0181] A flame retardant polyurethane resin was prepared by first forming a resin in accordance with the examples of commonly owned U. S. Pat. No. 4,532,316 and adding in the reactor a phosphorus-based additive FYROLFLEX® RDP, phosphate ester in an amount of about 20% by weight. After the polyurethane resin was formed, 65 parts by weight of the polyurethane resin was mixed with 24 parts by weight of expandable graphite (the expandable graphite having an expansion of greater than 900 micrometers at 280°C as determined by the TMA Expansion test) and an additional 17 parts by weight of another phosphorus-based flame retardant agent at 80°C in a stirring vessel. The mixture was cooled and used as is.

[0182] Heat Reactive Material 2

[0183] An aqueous heat reactive material was formed by hand mixing 1000 parts by weight (pbw) EDOLAN® AM aqueous acrylic resin (available from Tanatex Chemicals, Ede, Netherlands), 175 pbw of expandable graphite (the expandable graphite having an expansion of greater than 900 micrometers at 280°C as determined by the TMA Expansion test), 175 pbw of a phosphorus-based flame retardant agent, 120 pbw of glycerin, and 10 pbw of RESPUMIT ® NF01 defoamer. This mixture was hand-stirred until relatively homogeneous to form an acrylic mixture.

[0184] Prior to use, a mixture of 100 pbw of ARKOPHOP® DAN crosslinker (available from Archroma, Basal, Switzerland), 5 pbw of EDOLAN® XTP crosslinker and 10 pbw of ACRACONC® FN thickener (available from Tanatex Chemicals, Ede, Netherlands) was hand-stirred. This crosslinking mixture was added to the acrylic mixture and was stirred. This mixture was used as is.

[0185] Heat Reactive Material 3

[0186] An aqueous heat reactive material was formed by hand mixing 1000 parts by weight (pbw) EDOLAN® AM aqueous acrylic resin (available from Tanatex Chemicals, Ede, Netherlands), 240 pbw of expandable graphite (the expandable graphite having an expansion of greater than 900 micrometers at 280°C as determined by the TMA Expansion test), 240 pbw of a phosphorus-based flame retardant agent, 130 pbw of glycerin, and 10 pbw of RESPUMIT ® NF01 defoamer. This mixture was hand-stirred until relatively homogeneous to form an acrylic mixture.

[0187] Prior to use, a mixture of 130 pbw of ARKOPHOP® DAN crosslinker (available from Archroma, Basel, Switzerland), 5 pbw of EDOLAN® XTP crosslinker and 15 pbw of ACRACONC® FN thickener (available from Tanatex Chemicals, Ede, Netherlands) was hand-stirred. This crosslinking mixture was added to the acrylic mixture and was stirred. This mixture was used as is.

[0188] Heat Reactive Material 4

[0189] An aqueous heat reactive material was formed by hand mixing 1000 parts by weight (pbw) LURAPRET® DS 150 aqueous acrylic resin (available from Archroma, Basel, Switzerland), 240 pbw of expandable graphite (the expandable graphite having an expansion of greater than 900 micrometers at 280°C as determined by the TMA Expansion test), 240 pbw of a phosphorus-based flame retardant agent, 130 pbw of glycerin, and 10 pbw of RESPUMIT ® NF01 defoamer. This mixture was hand-stirred until relatively homogeneous to form an acrylic mixture.

[0190] Prior to use, a mixture of 130 pbw of ARKOPHOP® DAN crosslinker (available from Archroma, Basel, Switzerland), 5 pbw of EDOLAN® XTP crosslinker and 15 pbw of ACRACONC® FN thickener (available from Tanatex Chemicals, Ede, Netherlands) was stirred. This crosslinking mixture was added to the acrylic mixture and was hand- stirred. This mixture was used as is.

[0191] Polyethylene membrane 1

[0192] A waterproof breathable porous polyethylene membrane was prepared according to co-owned International Patent Application Publication No. W02020 / 028328, which is incorporated herein by reference in its entirety. The porous membrane comprised an ultrahigh molecular weight porous polyethylene film and the pores of the porous polyethylene were filled with a breathable polyurethane polymer.

[0193] Preparation of Laminate 1

[0194] A meltable layer of 100% recycled polyester knit fabric (item no. RJ47PmbG-T from Na Ya Plastics Corp., Taipei City, Taiwan) was laminated to carrier layer of polyethylene membrane 1 . Heat Reactive material 1 was gravure printed onto the polyethylene membrane using a gravure roll having a pattern of repeating dots providing an adhesive coverage of about 40-45% and an adhesive laydown of 40-45 grams meter2(gsm). The meltable layer was placed on top of the carrier layer and rolled between the nip of two rollers. This laminate was placed on a roll to cure for at least 24 hours. A second layer of heat reactive material 1 was printed onto the exposed side of the carrier layer, that is, opposite the meltable layer using the same gravure as was previously used and a 75-80 grams / meter2non-flame retardant jersey knit textile layer of 38% polyester / 60% viscose / 2% antistatic fibers was adhered to the second layer of the printed heat reactive material and the laminate was rolled between the nip of two rollers. This laminate was then placed on a roll to cure for at least 24 hours.

[0195] Preparation of Laminate 2

[0196] A meltable layer of 100% recycled polyester knit fabric (item no. RJ47Pmb, from Nan Ya Plastics Corp., Taiwan) was laminated to carrier layer of the polyethylene membrane 1 . Heat Reactive material 1 was gravure printed onto the ePTFE membrane using a gravure roll having a pattern of repeating dots providing an adhesive coverage of about 40-45% and an adhesive laydown of 40-45 grams meter2. The meltable layer was placed on top of the carrier layer and rolled between the nip of two rollers. This laminate was placed on a roll to cure for at least 24 hours. A second layer of heat reactive material 1 was printed onto the exposed side of the carrier layer, that is, opposite the meltable layer using the same gravure as was previously used and a 93 gram / meter2flame retardant jersey knit textile layer of 65% viscose / 23% TWARON®aramid / 12% polyamide 6 was adhered to the second printed layer of heat reactive material and the laminate was rolled between the nip of two rollers. This laminate was then placed on a roll to cure for at least 24 hours.

[0197] Each of laminates 1 and 2 were subjected to a Class 1 Box Arc test. In these tests, the laminates provided protection such that the energy transferred to a wearer was below the Stoll curve.

[0198] Preparation of Laminate 3

[0199] A meltable layer of MGNY08jPF fabric (available from Colorprint Textilveredlungs GmbH, Krefeld, Germany) was laminated to carrier layer of polyethylene membrane 1 . Heat Reactive material 2 was screen printed onto the ePE membrane using a 250 micrometer thick screen having a pattern of repeating 1 .3 millimeter (mm) holes providing an adhesive coverage area of about 30.5%. The meltable layer was placed on top of the carrier layer and rolled between the nip of two rollers. This laminate was heated at 100°C for 60 seconds and then allowed to cool to room temperature. A second layer of heat reactive material 2 was printed onto the exposed side of the carrier layer, that is, opposite the meltable layer using the same screen as was previously used and a textile layer (part number 310.300-000, available from Ames Textiles, Inc, Christiansburg, Virginia) was adhered to the second printed layer of heat reactive material and the laminate was rolled between the nip of two rollers. This laminate was then heated to 160°C for 60 seconds and allowed to cool to room temperature.

[0200] Preparation of Laminate 4

[0201] A meltable layer of 100% 85 gsm polyester knit fabric (part no. A04Y036DU available from Nan Ya Plastics, Taipei City, Taiwan) was laminated to carrier layer of polyethylene membrane 1 . Heat Reactive material 3 was screen printed onto the ePE membrane using a 250 micrometer thick screen having a pattern of repeating 1 .3 mm holes providing an adhesive coverage area of about 30.5%. The meltable layer was placed on top of the carrier layer and rolled between the nip of two rollers. This laminate was heated at 100°C for 60 seconds and then allowed to cool to room temperature. A second layer of heat reactive material 3 was printed onto the exposed side of the carrier layer, that is, opposite the meltable layer using a 250 micrometer thickscreen having a repeating pattern of 1 .6 mm holes and providing a coverage area of about 32.5%. An 80 gsm textile layer (available from Live Textil, Portugal) was adhered to the second printed layer of heat reactive material and the laminate was rolled between the nip of two rollers. This laminate was then heated to first to 100°C for 60 seconds followed by heating to a temperature of 160°C for 60 seconds and allowed to cool to room temperature.

[0202] Preparation of Laminate 5

[0203] A meltable layer of B 100% 85 gsm polyester knit fabric (part no. A04Y036DU available from Nan Ya Plastics, Taipei City, Taiwan) was laminated to carrier layer of polyethylene membrane 1 . Heat Reactive material 3 was screen printed onto the ePE membrane using a 250 micrometer thick screen having a pattern of repeating 1 .6 mm holes providing an adhesive coverage area of about 32.5%. The meltable layer was placed on top of the carrier layer and rolled between the nip of two rollers. This laminate was heated at 100°C for 60 seconds and then allowed to cool to room temperature. A second layer of heat reactive material 3 was printed onto the exposed side of the carrier layer, that is, opposite the meltable layer using a 250 micrometer thick screen having a repeating pattern of 1 .3 mm holes and providing a coverage area of about 30.5%. An 80 gsm textile layer (available from Live Textil, Portugal) was adhered to the second printed layer of heat reactive material and the laminate was rolled between the nip of two rollers. This laminate was then heated to first to 100°C for 60 seconds followed by heating to a temperature of 160°C for 60 seconds and allowed to cool to room temperature.

[0204] Preparation of Laminate 6

[0205] A meltable layer of 100% nylon 6,6 fabric (part no. TESF001 DK available from Knopfs & Sohn, Helmbrechts, Germany) was laminated to carrier layer of polyethylene membrane 1 . Heat Reactive material 3 was screen printed onto the ePE membrane using a 250 micrometer thick screen having a pattern of repeating 1 .6 mm holes providing an adhesive coverage area of about 32.5%. The meltable layer was placed on top of the carrier layer and rolled between the nip of two rollers. This laminate was heated at 100°C for 60 seconds and then allowed to cool to room temperature. A second layer of heat reactive material 3 was printed onto the exposed side of the carrierlayer, that is, opposite the meltable layer using a 250 micrometer thick screen having a repeating pattern of 1 .3 mm holes and providing a coverage area of about 30.5%. A layer of textile (part no. TEAB001 , available from Borgini Jersey S.r.l., Cassina Rizzardi CO Italy) was adhered to the second printed layer of heat reactive material and the laminate was rolled between the nip of two rollers. This laminate was then heated to first to 100°C for 60 seconds followed by heating to a temperature of 160°C for 60 seconds and allowed to cool to room temperature.

[0206] Preparation of Laminate 7

[0207] A meltable layer of B 100% 85 gsm polyester knit fabric (part no. A04Y036DU available from Nan Ya Plastics, Taipei City, Taiwan) was laminated to carrier layer of polyethylene membrane 1 . Heat Reactive material 4 was screen printed onto the ePE membrane using a 250 micrometer thick screen having a pattern of repeating 1 .3 mm holes providing an adhesive coverage area of about 30.5%. The meltable layer was placed on top of the carrier layer and rolled between the nip of two rollers. This laminate was heated at 100°C for 60 seconds and then allowed to cool to room temperature. A second layer of heat reactive material 4 was printed onto the exposed side of the carrier layer, that is, opposite the meltable layer using a 250 micrometer thick screen having a repeating pattern of 1 .6 mm holes and providing a coverage area of about 32.5%. An 80 gsm textile layer (available from Life Textile, Helmbrechts, Germany) was adhered to the second printed layer of heat reactive material and the laminate was rolled between the nip of two rollers. This laminate was then heated to first to 100°C for 60 seconds followed by heating to a temperature of 160°C for 60 seconds and allowed to cool to room temperature.

[0208] Preparation of Laminate 8

[0209] A meltable layer of B 100% 85 gsm polyester knit fabric (part no. A04Y036DU available from Nan Ya Plastics, Taipei City, Taiwan) was laminated to carrier layer of polyethylene membrane 1 . Heat Reactive material 4 was screen printed onto the ePE membrane using a 250 micrometer thick screen having a pattern of repeating 1 .6 mm holes providing an adhesive coverage area of about 32.5%. The meltable layer was placed on top of the carrier layer and rolled between the nip of two rollers. This laminate was heated at 100°C for 60 seconds and then allowed to cool to roomtemperature. A second layer of heat reactive material 4 was printed onto the exposed side of the carrier layer, that is, opposite the meltable layer using a 250 micrometer thick screen having a repeating pattern of 1 .3 mm holes and providing a coverage area of about 30.5%. An 80 gsm textile layer (available from Life Textile, Helmbrechts, Germany) was adhered to the second printed layer of heat reactive material and the laminate was rolled between the nip of two rollers. This laminate was then heated to first to 100°C for 60 seconds followed by heating to a temperature of 160°C for 60 seconds and allowed to cool to room temperature.

[0210] Preparation of Laminate 9

[0211] A meltable layer of TESF001 DK 100% nylon 6,6 fabric (part no. TESF001 DK available from Knopfs & Sohn, Helmbrechts, Germany) was laminated to carrier layer of polyethylene membrane 1 . Heat Reactive material 4 was screen printed onto the ePE membrane using a 250 micrometer thick screen having a pattern of repeating 1 .6 mm holes providing an adhesive coverage area of about 32.5%. The meltable layer was placed on top of the carrier layer and rolled between the nip of two rollers. This laminate was heated at 100°C for 60 seconds and then allowed to cool to room temperature. A second layer of heat reactive material 4 was printed onto the exposed side of the carrier layer, that is, opposite the meltable layer using a 250 micrometer thick screen having a repeating pattern of 1 .3 mm holes and providing a coverage area of about 30.5%. A layer of TEAB001 textile layer (part no. TEAB001 , available from Borgini Jersey S.r.i., Cassina Rizzardi CO Italy) was adhered to the second printed layer of heat reactive material and the laminate was rolled between the nip of two rollers. This laminate was then heated to first to 100°C for 60 seconds followed by heating to a temperature of 160°C for 60 seconds and allowed to cool to room temperature.

[0212] Each of laminates 3-9 was subjected to a horizontal flame test in both the warp and weft direction. Laminate 6 failed in the warp direction. All other laminates passed in both warp and weft directions. In each of these cases, the heat reactive materials were stirred by hand. It is believed that the hand-stirring resulted in a less than ideal dispersion of the components of the heat reactive material. These non-homogeneous dispersions did not have good screen printing properties which resulted in less thandesired penetration of the heat reactive material through each screen hole, which may account for the failure for laminate 6.

Claims

CLAIMS1 . A laminate comprising: a) a first textile layer; b) a first layer of a heat reactive material; c) a carrier layer comprising porous polyethylene; d) a second layer of a heat reactive material; and e) a second textile layer; wherein the first and second layers of heat reactive material each independently comprise a polymer resin and expandable graphite; and wherein the first layer of heat reactive material is between the first textile layer and the carrier layer and the second layer of heat reactive material is between the carrier layer and the second textile layer.

2. The laminate of claim 1 wherein each layer of heat reactive material is independently applied in a continuous manner or a discontinuous manner.

3. The laminate of claim 1 or 2 wherein each layer of heat reactive material is in a form of a pattern of discontinuous dots, lines or grids.

4. The laminate of any one of claims 1 to 3 wherein the expandable graphite expands at least about 900 micrometers upon heating to about 280°C, as measured in a thermomechanical analysis (TMA) expansion test.

5. The laminate of any one of claims 1 to 4 wherein at least one of the first and the second layer of heat reactive material comprises a flame retardant material.

6. The laminate of any one of claims 1 to 5 wherein the first textile layer and the second textile layer each comprise at least one meltable fiber.

7. The laminate of any one of claims 1 to 6 wherein the porous polyethylene is an expanded ultrahigh molecular weight polyethylene.

8. The laminate of any one of claims 1 to 7, wherein the porous polyethylene comprises pores which are at least partially filled with a hydrophilic polymer.

9. The laminate of any one of claim 1 to 8, wherein the porous polyethylene has a weight average molecular weight of greater than 500,000 grams / mole.

10. The laminate according to claim 8, wherein the hydrophilic polymer is a polyurethane, polyamide, polyester, polyether, ionomer, or a copolymer or a combination thereof.11 . The laminate of any one of claims 1 to 10 wherein the layers a) and c) are bonded to each other using the first layer of heat reactive material and the layers c) and e) are bonded to each other using the second layer of heat reactive material.

12. The laminate of any one of claims 1 to 11 wherein the first layer of heat reactive material covers greater than or equal to 25% of a surface of the first textile layer.

13. The laminate of any one of claims 1 to 12 wherein the second layer of heat reactive material covers greater than or equal to 25% of a surface of the second textile layer.

14. The laminate of any one of claims 1 to 13, wherein the laminate further comprises one or more additional layers of heat reactive material and one or more additional textile layers, wherein each subsequent additional layer is positioned adjacent to the textile layer.

15. The laminate of any one of claims 1 to 14, wherein the second textile comprises meltable fibers and is considered a no-melt / no-drip textile according to a melting and thermal stability test.

16. The laminate of any one of claims 1 to 15, wherein the polymer resin comprises an aqueous acrylic resin.

17. The laminate of any one of claims 1 to 16, wherein the laminate further comprises a protective layer.

18. The laminate of claim 17, wherein the protective layer is located between the first textile layer and the carrier layer.

19. A method of forming the laminate of any one of claim 1 to 18, comprising; i) adhering a first textile layer to a carrier layer with a first heat reactive material in between to form a precursor laminate; and ii) adhering the precursor laminate to a second textile layer with a second heat reactive material in between to form the laminate.

20. An article comprising the laminate of any one of claims 1-18.21 . The article of claim 20, wherein the article is a garment.

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