278 results about "Polyethylene membrane" patented technology

The invention provides a diepoxy alkoxy anthracene photosensitizer, and relates to the field of photopolymerization. The invention further comprises a light-cured resin composition containing the diepoxy alkoxy anthracene photosensitizer, a light-sensitive dry film containing the diepoxy alkoxy anthracene photosensitizer and application of the light-cured resin composition and the light-sensitive dry film. The photosensitizer provided by the invention has the characteristics of low migration before curing and low precipitation after curing, and is excellent in photosensitive property and high in photobleaching efficiency; the polymer can be widely applied to the fields of photopolymerization and photocuring of dry films, paints, coatings, printing ink, forming materials and the like; in a photosensitive dry film, the photosensitizer cannot migrate to a polyethylene film, and when an electroplating process is carried out after exposure and development, fragments cannot be separated out to pollute electroplating liquid, so that undesirable phenomena of short circuit, open circuit and the like of an anti-corrosion pattern are avoided, and the yield of a product is remarkably improved.

The present invention relates to a flash-spun polyethylene film material with a good toughness and a manufacturing method therefor. The raw materials thereof comprise polyethylene. The gram weight G of the flash-spun polyethylene film material is greater than 50 g / m2; the initial toughness Z0 of the flash-spun polyethylene film material is 20-35 (N·m) / g; and Z0=[RM×EM+RT×ET] / G, wherein RM is the tensile strength in the MD direction, RT is the tensile strength in the TD direction, EM is the tensile elongation in the MD direction, and ET is the tensile elongation in the TD direction. The flash-spun polyethylene film material is exposed in a dry and hot atmosphere at 90ºC for 6 hours, and is then cooled under the conditions of a temperature of 25ºC and a relative humidity of 65% for 24 hours, and the light transmittance thereof is measured to be 8-13%. The testing of the light transmittance is performed according to GBT2410-2008, and the light transmittance is the ratio of the luminous flux of light penetrating a sample to the luminous flux of light emitted onto the sample, and is expressed as a percentage. The flash-spun polyethylene film material of the present application has a relatively good toughness.

The invention provides a composite current collector, a secondary battery and an electronic device, the composite current collector comprises a base film and a conductive layer arranged on at least one surface of the base film, the base film comprises at least one of a polypropylene film, a polyethylene film, a polyimide film or aramid fiber, the porosity of the base film is P1%, 30 < = P1 < = 80, the aperture of the base film is phi1nm, 200 < = phi1 < = 1000, and the thickness of the conductive layer is 0.1-0.5 mm. The porosity of the conductive layer is P2%, 10 < = P2 < = 75, the aperture of the conductive layer is phi 2nm, and 100 < = phi 2 < = 800. The composite current collector comprises the structure, the type, the porosity and the aperture of the base membrane and the porosity and the aperture of the conductive layer are within the range of the application, so that lithium ions can be bidirectionally transmitted, the transmission path of the lithium ions is shortened, and the rate capability of the secondary battery is favorably improved.

The invention relates to the technical field of aluminum product film laminating, in particular to an aluminum product production film laminating device which comprises a supporting frame, and a conveying roller and a supporting roller are rotationally connected to the supporting frame through bearings; a vertical plate is fixedly connected to the supporting frame, a rotating column is rotationally connected to the vertical plate through a bearing, a cross is fixedly connected to the rotating column, a plurality of rotating shafts are rotationally connected to the cross through bearings, pressure rollers are fixedly connected to the rotating shafts, and the lengths of the pressure rollers are different. The rotating column is fixedly connected with a gear, the gear is meshed with a rack, and the rack moves through a moving mechanism. According to the device, when the pressure roller presses a polyethylene film, the pressure is uniform, the condition of wrinkles is avoided, and therefore the film covering effect on an aluminum material is guaranteed.

The invention discloses a preparation method of a multifunctional polyvinyl composite film and application of the multifunctional polyvinyl composite film in food preservation. The preparation method comprises the following steps: firstly, preparing Ag-coated MOF through a hydrothermal method, then uniformly dispersing the Ag-coated MOF and tannic acid into a carboxymethyl chitosan solution, and carrying out crosslinking modification on the Ag-coated MOF; and coating the prepared CMCS / TA / Ag (at) MOF mixed solution on a polyethylene film treated by oxygen plasma, and drying to form a film, so as to obtain the multifunctional polyethylene-based composite film. The CMCS and the TA are adopted to perform crosslinking modification on the Ag-coated MOF, so that the stability of the Ag-coated MOF can be further improved, and the release of silver ions is reduced. Compared with a common PE preservative film, the composite film prepared on the basis has better barrier capacity and mechanical property, and has antibacterial, anti-ultraviolet and anti-oxidation effects. The multifunctional preservative film is convenient to use and low in price, and has an important application prospect in the aspect of fresh-keeping packaging of meat products.

The invention relates to a liquid metal gel material, a preparation method thereof and a thermal interface material, and belongs to the field of thermal interface materials. Wherein the liquid metal gel material comprises a modified polyethylene film, and the modified polyethylene film comprises a polyethylene film and metal particles attached to at least part of the surface of the polyethylene film; the modified polyethylene film is at least partially filled with the liquid metal. The liquid metal gel material provided by the invention has the advantages of low thermal resistance, high thermal conductivity, excellent mechanical properties and high stability in a dynamic environment, and can meet the use requirements of high-end fields on thermal interface materials.

The invention discloses a comfortable medical nursing pad with a multi-layer structure and a preparation process thereof, and relates to the field of hygienic products, the nursing pad comprises a top layer, a bottom layer and a top layer, the top layer is a skin-friendly layer and is made of a non-woven fabric material; the composite core layer is an attached water absorption diffusion layer and comprises a supporting structure of a three-dimensional porous material, a cellulose gel structure embedded in the three-dimensional porous material and a fluff pulp fiber structure mixed in the three-dimensional porous material; the bottom layer is an anti-seepage breathable layer and is made of a polyethylene film material. A three-dimensional porous material is used as a supporting structure of the composite core layer, a cellulose gel structure is embedded, a large amount of liquid can be rapidly absorbed and kept, a gelatinous substance is formed, the liquid is effectively locked and prevented from back seepage, meanwhile, a fluff pulp fiber structure is mixed, dynamic balance of liquid absorption, diffusion and storage can be achieved, and the effect of improving the quality of the product is achieved. Therefore, the overall absorption efficiency and comfort are improved.

The invention discloses a preparation method of a solvent-resistant nanofiltration membrane and the solvent-resistant nanofiltration membrane. The preparation method comprises the following steps: infiltrating a polyethylene-based membrane; performing hydrophilic modification treatment on the infiltrated polyethylene base membrane by using a hydrophilic modification solution to obtain a precursor base membrane; preparing a water phase solution containing UiO-66, and preparing an oil phase solution containing polyfunctional aromatic acyl chloride; performing interfacial polymerization reaction on the surface of the precursor base membrane by using the water-phase solution and the oil-phase solution to obtain a polyethylene nanofiltration membrane; performing cross-linking treatment on the polyethylene nanofiltration membrane by using a cross-linking solution to obtain the solvent-resistant nanofiltration membrane, wherein the solute of the hydrophilic modification solution comprises dopamine and polyethyleneimine. Hydrophilic modification treatment of dopamine and polyethyleneimine is carried out on the polyethylene film, and UiO-66 nanoparticles are added into a water-phase solution, so that the flux and the interception performance of the film are remarkably improved.

The invention discloses a fireproof flame-retardant battery diaphragm, a preparation method thereof and a fireproof flame-retardant battery, and relates to the technical field of battery diaphragms. When the fireproof flame-retardant battery diaphragm is prepared, boric acid diglyceride and chlorinated trimellitic anhydride mixed liquor react to prepare a flame-retardant monomer; the preparation method comprises the following steps: polymerizing 4, 4 '-diaminodiphenyl ether and a flame-retardant monomer, and carrying out electrostatic spraying to prepare polyamide acid microspheres; dehydrating and drying the polyamide acid microspheres to obtain polyimide microspheres; performing etching-acidification on the polyimide microspheres to prepare carboxylated polyimide microspheres; allyl phosphoric acid and acrylic acid are copolymerized and grafted on the surface of a polyethylene film to prepare a modified polyethylene film; and coating the surface of the modified polyethylene film with the carboxylated polyimide microspheres to prepare the fireproof flame-retardant battery diaphragm. The prepared fireproof flame-retardant battery diaphragm has excellent flame retardance, wetting performance and thermal stability.

The invention provides a photosensitive resin composition containing an alkynyl anthracene photosensitizer and application of the photosensitive resin composition. A conjugated alkynyl functional group is introduced to the 9 and / or 10 position of a structural main body anthracene ring of the photosensitizer. Compared with the existing DBA photosensitizer, the introduction of alkynyl expands the size of a conjugated system, lengthens the maximum absorption wavelength of molecules, improves the initiation efficiency, is especially suitable for a photo-initiation system under the 405nm illumination condition, reduces the exposure energy, and also ensures good solubility and compatibility of a formula; besides, compared with an existing DBA photosensitizer, small molecule fragments cannot be generated and cannot be migrated to a polyethylene film, and when an electroplating procedure is carried out after exposure and development, the fragments cannot be separated out to pollute electroplating liquid, so that the undesirable phenomena of short circuit, open circuit and the like of an anti-corrosion pattern are avoided, and the yield of a product is remarkably improved; the method can be widely applied to the photo-curing fields of dry films, paints, coatings, printing ink, forming materials and the like.

To provide a polyethylene film having excellent transparency and good appearance while containing mechanically recycled polyethylene, and a laminate and a packaging bag using the same.SOLUTION: A polyethylene film 1 of a single layer contains mechanically recycled polyethylene, wherein a rate of existence of foreign matters having a size of 1 mm2 or more is 0.03 piece / m2 or less, and a haze value is 30% or less.SELECTED DRAWING: Figure 1

The invention relates to the field of high polymer material processing, and discloses an antifogging antibacterial PE film production process, which comprises: S1, raw material blending and mixing: blending low density polyethylene, linear low density polyethylene, a bio-based antifogging agent, a modified zinc oxide-graphene composite antibacterial agent, a polylactic acid compatibilizer and a slipping agent according to a ratio, mixing through a double-screw extruder, and adopting temperature gradient control; s2, three-layer co-extrusion film blowing: preparing a polyethylene film with a three-layer structure by adopting a three-layer co-extrusion film blowing process; s3, traction and rolling are conducted, specifically, the film is pulled through a traction device, the traction speed is controlled in a segmented mode, and rolling is center surface friction rolling; and S4, slitting and packaging. By adopting the modified zinc oxide-graphene composite antibacterial agent and utilizing the synergistic effect of zinc oxide nanoparticles and graphene, the antibacterial rate of the film reaches 90%-95% and is improved compared with 70%-75% of common zinc oxide, and the antibacterial ability of the film is enhanced.

The invention relates to the technical field of bearing films, in particular to a normal-temperature easy-to-peel bearing film and a preparation method thereof. The normal-temperature easy-to-peel bearing film comprises a base material, a polyester adhesive coated on the surface of the base material, and an isolating film adhered on the surface of the polyester adhesive, the base material is at least one of a polyethylene glycol terephthalate film, a polyimide film and a polyolefin film; and the isolating film is at least one of a release film, release paper, synthetic paper, a polypropylene film and a polyethylene film. The polyester adhesive is obtained by dissolving polyester resin and a coupling agent in a solvent, then adding a cross-linking agent and uniformly mixing; or the polyester adhesive is obtained by dissolving polyester resin, a coupling agent and a stabilizing material in a solvent, then adding a cross-linking agent and uniformly mixing. The bearing film is easy to strip under the normal temperature condition, operation of an automatic technology is facilitated, it is ensured that when the temperature rises in the manufacturing process, the bearing film can provide enough viscosity, and meanwhile the bearing film has the advantages of being resistant to acid and alkali and free of adhesive residues.

The embodiment of the utility model provides a photovoltaic backboard and a solar photovoltaic panel. The photovoltaic backboard comprises an outer layer, a first adhesive layer, a middle layer, a second adhesive layer and an inner layer which are arranged in sequence, the outer layer adopts a polyethylene glycol terephthalate film; the first adhesive layer is used for bonding the outer layer and the middle layer; the middle layer is made of a continuous glass fiber reinforced thermoplastic polyester composite material; the second adhesive layer is used for bonding the middle layer and the inner layer; and the inner layer adopts a polyethylene film. The photovoltaic backboard is light in weight and high in strength, and has more excellent insulativity, aging resistance, environmental erosion resistance and dimensional stability.

A freight vehicle has a cargo space that is convertible for handling piece goods and is also suitable for hauling liquid bulk material. A conventional cargo space is equipped with a drop-down frame and flexible liquid enclosure that is stowed in the ceiling of the trailer while hauling a full load of palletized or piece goods materials that can be lowered to the floor for transporting liquid bulk loads. Generally, the long tubular (round and or oval in shape from an end view) can be fitted with a polyethylene film disposable liner. The disposable poly liner will ensure the liquid freight is free from contamination. This concept not only eliminates the need for a liquid tanker to be washed out between each load but also allows for the hauling of piece goods freight when the frame system is raised back to the ceiling.

The invention belongs to the technical field of total heat exchange membranes for fresh air systems, and relates to a cleanable, efficient and environment-friendly total heat exchange membrane and a preparation method thereof. The total heat exchange membrane comprises a base membrane and a membrane casting layer compounded on the surface of the base membrane, the base membrane is a wet-process double-drawing polyethylene membrane, and the membrane casting solution comprises a high-molecular polymer and a moisture absorbent and can also comprise a modifier. The high-molecular polymer is one of polyvinyl alcohol, sodium alginate, chitosan, polyvinylpyrrolidone and polyurethane; the moisture absorbent is one of common metal chloride and glycerol; and the modifier is one of malic acid, calcium chloride and magnesium chloride. When the water resistance of the film is improved, the film has high moisture permeability and can be recycled; the total heat exchange membrane prepared by the method is simple in process, low in cost, good in moisture permeability and gas barrier property, and suitable for being used as a total heat exchanger of a fresh air system, and secondary pollution is avoided.

The invention discloses a steam eyeshade with effects of soothing nerves and helping sleep and a preparation method of the steam eyeshade. The steam eyeshade comprises an eyeshade body, and ear hooks are connected to the two sides of the eyeshade The eyeshade body comprises an inner layer and an outer layer, and a heat insulation layer, a micro-bead massage layer, a double-U-shaped heating unit and a filtering layer are sequentially arranged from the inner layer to the outer layer. And a far infrared ceramic powder coating is arranged on one side, facing the double-U-shaped heating unit, of the filter layer. The inner layer and the outer layer are non-woven fabrics, the heat insulation layer is a polyethylene-polyvinylidene fluoride microporous composite membrane, and the filter layer is a polyethylene microporous membrane. Wherein the micro-bead massage layer is mainly prepared from aluminum oxide micro-beads with the diameter of 0.8-1.2 mm, compound essential oil, natural plant extract liquor and polyvinyl alcohol. The steam eyeshade prepared by the invention is comfortable to wear, safe and environment-friendly, and can keep constant temperature for more than 30 minutes; the eye mask can massage eye skin, relieve fatigue, fade fine lines around eyes and dark circles, soothe the nerves and help sleep.

The invention relates to the technical field of polyethylene film materials, in particular to a weather-resistant flame-retardant PE composite film and a preparation method thereof.The preparation method comprises the following steps that S1, a PE-based copolymer, an antioxidant and a light stabilizer are mixed and then discharged; s2, mixing LDPE resin, magnesium hydroxide, a silane coupling agent and zinc stearate, and discharging; s3, the outer-layer mixture and the core-layer mixture are put into a double-screw extruder for melt extrusion granulation and drying, and outer-layer master batches and core-layer master batches are obtained; and S4, respectively putting the outer-layer master batch and the core-layer master batch into an extruder for extrusion, and carrying out three-layer co-extrusion casting film forming, cooling shaping and rolling to obtain the weather-resistant flame-retardant PE composite film. The weather-resistant flame-retardant PE composite film obtained by the preparation method disclosed by the invention has relatively good weather resistance and flame retardance.

The invention belongs to the technical field of film materials, and particularly relates to a high-barrier polyethylene film and a preparation method thereof. The material consists of a polyethylene-based film layer, a coating barrier layer and an aluminum-plated layer, wherein the polyethylene-based film layer is prepared by combining nine layers of co-extruded films with a micro-stretching process; the coating blocking layer is composed of a water-based acrylic acid coating layer and a water-based polyvinyl alcohol coating layer which are connected in sequence, the polyvinyl base film layer is coated with the water-based acrylic acid coating layer, and the aluminum plating layer is plated on the water-based polyvinyl alcohol coating layer in a vacuum mode. The high-barrier polyethylene film material is good in barrier effect and can be recycled.

The present invention discloses a photosensitive resin composition containing an anthracene-based chalcone photosensitizer and its application. The photosensitive resin composition includes an anthracene-based chalcone photosensitizer, and the anthracene-based chalcone photosensitizer includes at least one anthracene derivative represented by general formula (I) to (III); #imgabs0# wherein: R 1 The anthracene chalcone is selected from the group consisting of a C1-C5 straight-chain or branched alkyl group, an N-methylpyrrole-2-yl group, a furan-2-yl group, a benzofuran-2-yl group, a thiophene-2-yl group, a naphthalene-2-yl group, a phenyl group, and a substituted aryl group. In the present invention, anthracene chalcone is used as a photosensitizer for the photosensitive resin composition. The photosensitizer does not migrate into the polyethylene film (PE), and in the electroplating process after exposure and development, small molecular fragments are not precipitated to contaminate the electroplating solution, thereby avoiding adverse phenomena such as short circuit and open circuit of the resist pattern and significantly improving the yield rate of the product.

The present invention relates to a layered polyethylene MDO film comprising high amounts of a specific ethylene copolymer with a narrow molecular weight distribution in a layer. This film provides a high stiffness and excellent adhesion properties. The invention further relates to a barrier film comprising a metal layer or barrier coat and the aforementioned layered polyethylene MDO film, to a process for forming a barrier film from said layered polyethylene MDO film, to a laminate and to an article comprising the barrier film. The oxygen and vapor permeability of the barrier film are low so that the barrier film is particularly suited for packaging foodstuff or other oxygen sensitive products.

A process for producing a polyethylene composition oriented film comprising: providing from 60 to 90 wt% of a linear low density polyethylene resin; the linear low density polyethylene resin has an MI2 in the range of from 0.9 to 4.0 g / 10 min; a density ranging from 0.910 to 0.930 g / cm3; an Mw / Mn of at least 2.5; a z average molecular weight (Mz) of up to 310, 000 g / mol; and the linear low density polyethylene resin is a copolymer of ethylene and one or more comonomers wherein the one or more comonomers are present in a content ranging from 7.0 to 11.0 wt% based on the linear low density polyethylene resin; providing from 10 to 40 wt% of a high density polyethylene resin; the high density polyethylene resin has an MI2 in the range of from 0.5 to 1.6 g / 10 min; a density ranging from 0.950 to 0.965 g / cm3; and melt blending the linear low density polyethylene resin with the high density polyethylene resin to produce a polyethylene composition.

The invention relates to the technical field of waterproof coiled materials, in particular to a self-adhesive waterproof coiled material and a preparation method thereof. The waterproof roll comprises a polyethylene film, a main body layer, a self-adhesive layer and an isolating film from top to bottom, wherein the main body layer is obtained by extruding, granulating and melting matrix asphalt, butyl rubber, modified vermiculite, a borate compound, an antioxidant and sulfur, dip-coating gridding cloth on two sides, and calendaring and shaping; and the self-adhesive layer is obtained by melting and curing SEBS, hydrogenated petroleum resin, polyisobutene, modified vermiculite, a borate compound, a plasticizer and an antioxidant. Compared with the prior art, the prepared self-adhesive waterproof coiled material has better resistance to damp-heat aging and salt erosion, and is especially suitable for coastal, underground, high-humidity and other severe environments.

An assembly includes an acoustic device. The acoustic device can include a polyethylene membrane. The polyethylene membrane can have first direction and a second direction, the second direction being orthogonal to the first direction. The polyethylene membrane can have a surface area per volume of at least 39×106 / m. The polyethylene membrane can have a geometric mean tensile modulus of 250 to 750 MPa. The polyethylene membrane can have a maximum tensile modulus in the first direction of 440 to 915 MPa. The polyethylene membrane can have a maximum tensile modulus in the second direction of 275 to 515 MPa. The polyethylene membrane can be an expanded polyethylene membrane.

The invention relates to the technical field of polyethylene films, and particularly discloses a low-precipitation polyethylene film and a preparation method thereof. The low-precipitation polyethylene film is prepared from the following raw materials: polyethylene, silicon carbide nanowires, nano talcum powder, an antioxidant and glyceryl stearate. The alkane precipitation amount of the obtained polyethylene film is 5 ppm or below, and precipitation of alkane molecules of the polyethylene film is obviously reduced.

The utility model relates to a novel PE (Poly Ethylene) reticulated protective film, which comprises a polyethylene film layer and an adhesive layer coated on one side of the polyethylene film layer, the adhesive layer is of a reticulated structure, the polyethylene film layer is provided with arrayed small holes, the aperture of the small holes is 0.1-0.3 mm, and the distance between adjacent small holes is smaller than the distance between corresponding sides of a single reticulated hole of the adhesive layer. As the arrayed small holes are formed in the polyethylene film layer, and the distance between the adjacent small holes is smaller than the distance between the corresponding edges of the single reticulate pattern hole of the adhesive layer, each mesh hole formed by the reticulate pattern is provided with the small holes, the protective film is attached to the surface of a part workpiece during production, and then the part workpiece is put into a negative pressure box, so that the surface of the part workpiece is protected; under the action of negative pressure, residual small bubbles attached to a protective surface can be pumped away, so that a film is tightly attached to the protective surface, the purpose of film pasting can be achieved without excessive mechanical actions in the film pasting process, protective film pasting of easily-damaged products is achieved, the film pasting quality is good, the workpiece effect is high, and parts are not prone to being damaged.

The utility model discloses a plasterboard with multilayer protection, which comprises a first protective layer, a plasterboard layer and a second protective layer, the first protective layer is arranged on the end face of one side of the plasterboard layer, the second protective layer is arranged on the end face of the other side of the plasterboard layer, and the first protective layer and the second protective layer have the same structure. The damp-proof layers are arranged on the two sides of the gypsum board layer, the damp-proof layers are the polyethylene films, the good damp-proof effect can be achieved, the mildew-proof layers are arranged in the damp-proof layers and are the micropore ceramic boards, the good mildew-proof effect is achieved, the fireproof layers are arranged on the inner sides of the mildew-proof layers and are the fireproof coatings, and therefore the fireproof effect is achieved. And the reinforcing layer is arranged on the inner side of the fireproof layer, and the reinforcing layer is made of glass fiber cloth, so that a very good reinforcing effect is achieved, and the gypsum board layer has multiple protections in the using process and is long in service life.

The utility model relates to the technical field of veterinary diagnosis equipment, and discloses a forming device for producing a polyethylene film plastic bag, which comprises a device main body and a wind-up roller, the device main body is provided with a mounting rack, the mounting rack is provided with a rotating motor, an action output shaft of the rotating motor is provided with a rotating disc, and the rotating disc is provided with a wind-up roller. Four sliding rods are arranged on the rotating disc in the circumferential direction at intervals, mounting blocks are mounted on the sliding rods, mounting grooves are formed in the mounting blocks, a connecting shaft is arranged at one end of the winding roller in a protruding mode, the connecting shaft is clamped in the mounting grooves, and a hexagonal butt joint block is arranged at the other end of the winding roller in a protruding mode. When the winding device is used, the other winding roller on the rotating disc can be driven by the rotating motor to be in butt joint with the winding motor, and the limiting rod is pulled out to remove the connection and fixation between the limiting clamping block and the mounting block, so that the connecting shaft can be separated from the mounting block, and the purpose of detaching the winding roller from the device for replacement is achieved.

The utility model relates to a medical liquid preparation packaging bag with a sealing strip structure. Comprising three heat sealing edges, a clamping chain, an easy-to-tear opening and a bag wall and further comprises a sealing strip, the sealing strip is arranged above the clamping chain, the sealing strip structurally comprises a polyethylene film layer, a nylon film layer and a bonding layer for fixedly bonding the polyethylene film layer and the nylon film layer, a polyethylene thin layer is arranged on the outer side of the nylon film layer, the polyethylene film layer is fixedly bonded with the inner wall of the bag wall on one side, and the sealing strip is arranged on the outer side of the nylon film layer. The polyethylene thin layer is fixedly bonded with the inner wall of the bag wall on the other side, and the thickness of the polyethylene thin layer is far smaller than that of the polyethylene film layer on the sealing strip. The two sides of the additionally arranged sealing strip have heat sealability, but due to the fact that the thicknesses of the heat sealability materials on the two sides are obviously different, the thin spraying film side of the heat sealability materials can achieve the heat sealing and complete anti-seepage effects, and the other side of the heat sealability materials has lower heat sealing strength. And the required force value during opening is relatively low.

The present invention relates to a film comprising at least one sealing layer wherein at least one layer A of the sealing layer(s) comprises a polyethylene comprising moieties derived from ethylene and moieties derived from an α-olefin comprising 4 to 10 carbon atoms, the polyethylene having a density of ≥870 and ≤920 kg / m3 as determined in accordance with ASTM D792 (2013), wherein the polyethylene has: x a fraction of material that is eluted in analytical temperature rising elution fractionation (a-TREF) at a temperature ≤30.0° C. of ≥5.0 wt %, preferably ≥10.0 wt %, with regard to the total weight of the polyethylene; x a shear storage modulus G′ determined at a shear loss modulus G″=5000 Pa of >700 Pa, G′ and G″ being determined in accordance with ISO 6721-10 (2015) at 190° C.; x a melt mass-flow rate, determined at 190° C. under a load of 2.16 kg in accordance with ASTM D1238 (2013) of ≥2.60 and ≤4.90 g / 10 min; and x a chemical composition distribution broadness (CCDB) of ≥15.0, preferably ≥20.0. Such film allows for sealing of the film at a reduced temperature, whilst still providing a desirable seal strength, and a desirable hot-tack strength.