172 results about "Ethylene propylene copolymer" patented technology

Disclosed are a high-strength high-elongation separator and a preparation method therefor. The high-strength high-elongation separator comprises ultra-high molecular weight polyolefin and a solubilizer, wherein the solubilizer is one of or a mixture of more of an ethylene-propylene copolymer, an ethylene-butylene copolymer and an ethylene-octene copolymer. The preparation method therefor comprises: mixing ultra-high molecular weight polyolefin, a solubilizer and a pore-forming agent, and stirring same until uniform, so as to obtain a premixed raw material; injecting the premixed raw material into an extruder, heating same to obtain a thermodynamic single-phase melt, and subjecting the thermodynamic single-phase melt to melt casting onto a cooling roller, so as to obtain a crystallized cast sheet; and subjecting the crystallized cast sheet to primary stretching and cooling to obtain a primary stretched film, subjecting the primary stretched film to secondary stretching to obtain a secondary stretched film, performing extraction and washing, and then drying same, so as to obtain a high-strength high-elongation separator. The preparation method utilizes the solubilizing effect of a copolymer and multiple operations of stretching performed in steps, and therefore the separator has good ductility and tensile strength.

The invention discloses a hot melt adhesive with high initial adhesion strength and a preparation method thereof, and relates to the technical field of hot melt adhesives, the hot melt adhesive comprises the following raw materials by weight: 50-70 parts of APAO resin; 10 to 20 parts of an ethylene-propylene copolymer; 20 to 30 parts of modified petroleum hydrogenated resin; 10 to 20 parts of phenolic terpene resin; 15 to 25 parts of polyethylene wax; 20 to 40 parts of a styrene-butadiene-styrene block copolymer; 0.5 to 1 part of an antioxidant; the modified petroleum hydrogenated resin is prepared by modifying petroleum hydrogenated resin, tetrahydrofuran, triethylamine, p-hydroxyanisole and acryloyl chloride. The hot melt adhesive has the effect of improving the initial adhesion strength of the hot melt adhesive.

The invention relates to the field of high polymer materials, and particularly discloses a high-temperature-resistant and aging-resistant polypropylene insulating material and a preparation method thereof.The polypropylene insulating material is prepared from 70-90 parts of polypropylene, 15-25 parts of ethylene-propylene copolymer, 5-8 parts of nanometer functional filler, 0.5-2 parts of antioxidant, 1-3 parts of stabilizer and the like. The nano functional filler is prepared by wrapping core nano zinc oxide with a boron nitride-based composite shell layer. The polypropylene insulating material prepared in the invention has good high temperature resistance and aging resistance.

The invention belongs to the technical field of high polymer materials, and particularly relates to a polyolefin composite material as well as a preparation method and application thereof. The polyolefin composite material is prepared from the following raw materials: polyethylene, a polyolefin toughening agent, a compound flame retardant and a filler, the melt index of the polyethylene at 190 DEG C / 2.16 kg is greater than or equal to 18 g / 10 min, and the bending modulus is less than or equal to 160 MPa; the polyolefin toughening agent is selected from at least one of an ethylene-propylene copolymer, an ethylene-butylene copolymer and an ethylene-vinyl acetate copolymer, and the melt index at 230 DEG C / 2.16 kg is greater than or equal to 9 g / 10 min; the compound flame retardant comprises tetrabromobisphenol S bis (2, 3-dibromopropyl) ether, antimony trioxide and hydroquinone bis (diphenyl phosphate), and the filler is at least one of talcum powder, barium sulfate and wollastonite. Through specific types of polyethylene, the polyolefin flexibilizer, the compound flame retardant and the filler, excellent flame retardance and toughness can be obtained.

The invention relates to the technical field of special plastics, in particular to a low-friction-coefficient plastic, a production process and a low-friction-coefficient plastic product, the low-friction-coefficient plastic comprises the following components in parts by weight: 100 parts of a matrix resin system, and the matrix resin system comprises 70-90 parts of polypropylene; 10 to 30 parts of an ethylene-propylene copolymer; 3 to 10 parts of functional microcapsules; 4-12 parts of an interface regulation and control system; according to the low-friction-coefficient plastic, the static friction coefficient is smaller than or equal to 0.10, the dynamic friction coefficient is smaller than or equal to 0.08, meanwhile, the extremely low atomization value is kept to be smaller than or equal to 1.5%, and the extremely low atomization value (smaller than or equal to 1.5%) and the high glossiness retention rate (larger than or equal to 95%) are kept while the low-friction-coefficient plastic obtains excellent friction performance (the static friction coefficient is smaller than or equal to 0.10, and the dynamic friction coefficient is smaller than or equal to 0.08).

To provide a polyolefin-based resin film from which a packaging bag obtained from a laminate laminated on a base material film is excellent in rectilinear cutting properties, easy tearing properties and bag making workability, is less likely to be broken at the time of falling even after retort, and is less likely to generate whiskers at the time of opening, even in a case in which the base material film has large distortion of a molecular orientation axis.SOLUTION: A polyolefin-based resin film is composed of a polypropylene-based resin composition, contains 40 to 97 pts. wt. of a propylene-ethylene block copolymer composed of propylene and ethylene having an ethylene content of 20 to 50 pts. wt, and 3 to 10 pts. wt. of one or more kinds of elastomers selected from an ethylene-propylene copolymerization elastomer, a propylene-butene copolymerization elastomer, and an ethylene-butene copolymerization elastomer, and has a heat shrinkage percentage in a longitudinal direction of 1% or more and 9% or less, and an x-axis orientation coefficient ΔNx calculated from a refractive index of 0.0180 or more and 0.0220 or less.SELECTED DRAWING: None

The invention relates to the technical field of polymer composite materials, in particular to a corrosion-resistant composite material for a pin insulator wire fixing device and a preparation method of the corrosion-resistant composite material. 5-10 parts of an ethylene-propylene copolymer elastomer; 2 to 4 parts of maleic anhydride grafted polypropylene; 0.5 to 1 part of polyethylene glycol; 3-5 parts of nano silicon dioxide subjected to surface silanization treatment; 5-10 parts of surface modified mica sheets; 0.5 to 2 parts of fluorinated graphene; 0.2 to 0.5 part of a hindered amine light stabilizer; 0.2 to 0.5 part of a hindered phenol antioxidant; 0.2 to 0.4 part of a benzotriazole ultraviolet light absorber; 0.3 to 0.6 part of metal stearate; the corrosion-resistant coating has the advantages that the corrosion medium permeation is effectively blocked, and the corrosion-resistant coating has excellent corrosion resistance under the corrosion medium in acidic, alkaline and salt mist environments.

The invention discloses a polypropylene insulated cable and a processing method thereof, and belongs to the technical field of insulated cables. The cable sequentially comprises a conductor, an insulating layer and a sheath layer from inside to outside. Wherein the insulating layer is prepared from the following raw materials in parts by weight: 70 to 80 parts of polypropylene resin, 10 to 20 parts of functional additive, 3 to 5 parts of chopped glass fiber, 0.6 to 1.0 part of lubricant and 0.1 to 0.3 part of initiator, and the sheath layer is additionally provided with superfine aluminum oxide and ethylene-propylene copolymer. Wherein the functional additive improves the flame retardance and thermal stability of the cable. The insulating layer and the sheath layer of the cable are kept consistent on the main body material, so that the overall interface bonding force and the structural consistency of the cable are improved, and meanwhile, the raw material purchasing and production process flow is simplified; in conclusion, the cable prepared by the invention simultaneously solves the problems of poor flame retardance and easy thermal aging of a polypropylene cable, and can be widely applied to the technical field of insulated cables with high performance requirements.

Provided are multilayer films including ethylene-based polymers. The multilayer films can be fully compatible with polyethylene recycling streams. The multilayer films comprise a first outer layer, a second outer layer, and a core, the core including a first core layer that includes an ethylene-propylene copolymer. The multilayer films of the present invention can exhibit improved, maintained, or desirable properties, such as high tear resistance, in comparison to existing multilayer film structures that are not fully compatible with polyethylene recycling streams.

The present disclosure relates to a multilayer film, which successively has: a first outer layer containing a propylene homopolymer (A) and a propylene-ethylene random copolymer (B) as a heat-seal layer; an inner layer containing a propylene-ethylene block copolymer (C) and an ethylene-propylene copolymer elastomer (D); and a second outer layer containing the propylene homopolymer (A) and the propylene-ethylene random copolymer (B), wherein at least any one of the first outer layer, the inner layer, and the second outer layer further contains a polyphenol compound.

The invention relates to a polypropylene material as well as a preparation method and application thereof. The polypropylene material comprises the following components: co-polypropylene, the co-polypropylene comprises a continuous phase formed by a homo-polypropylene chain segment and a rubber phase formed by an ethylene-propylene copolymer chain segment; the isotacticity of the homo-polypropylene chain segment is 98 to 99 percent; the mass percentage content of the rubber phase in the co-polypropylene is 10-15%; the mass percentage content of the ethylene unit in the rubber phase is 20-40%; the melt index of the polypropylene material is 60 to 100g / 10min. Through component design, the polypropylene material provided by the invention has the characteristics of high melt index, high modulus and high impact resistance, and can meet the application requirements of large thin-wall workpieces.

According to one embodiment of the present disclosure, a multilayer film may comprise a first outer layer, a second outer layer, and a core. The core may comprise a first core layer, a second core layer, and a third core layer. The core may be positioned between the first outer layer and the second outer layer. The first core layer may comprise a first recycled resin. The second core layer may comprise at least one of a polypropylene or an ethylene-propylene copolymer. The multilayer film may comprise at least 20 wt. % of the first recycled resin and the optional second recycled resin, based on the total weight of the multilayer film.

The invention belongs to the technical field of PTFE (polytetrafluoroethylene) coating materials, and particularly relates to a polytetrafluoroethylene resin material as well as a preparation method and application thereof. The polytetrafluoroethylene resin material provided by the invention comprises the following preparation raw materials in parts by mass: 90-100 parts of polytetrafluoroethylene, 1-10 parts of an organic additive and 15-25 parts of a lubricant, the organic additive comprises a perfluoroalkoxy resin and / or a fluorinated ethylene propylene copolymer. The obtained polytetrafluoroethylene resin material is better in flexibility, the produced E + PTFE coating pad can be softer, the sealing performance and the pressure bearing capacity are improved, and the problems that a PTFE coating membrane is high in hardness and poor in flexibility are solved; and meanwhile, the polytetrafluoroethylene resin material provided by the invention is transparent in character, and even if bubbles are generated in the E + PTFE coating pad during preparation, the bubbles can be found in time, so that the product quality is ensured.

The application discloses a high-strength high-ductility diaphragm and a preparation method thereof. The high-strength high-ductility diaphragm comprises ultrahigh molecular weight polyolefin and a solubilizing agent, wherein the solubilizing agent is a mixture of one or more of ethylene-propylene copolymer, ethylene-butene copolymer and ethylene-octene copolymer. The preparation method comprises the following steps: mixing the ultrahigh molecular weight polyolefin, the solubilizing agent and a pore-forming agent, stirring until uniform to obtain premixed raw materials; injecting the premixed raw materials into an extruder, heating to obtain a thermodynamic single-phase melt, and melt casting the thermodynamic single-phase melt onto a cooling roller to obtain a crystalline casting sheet; once stretching the crystalline casting sheet, cooling to obtain a once-stretched film, twice stretching the once-stretched film to obtain a twice-stretched film, washing, drying to obtain the high-strength high-ductility diaphragm. The preparation method utilizes the solubilizing effect of the copolymer and multiple step-by-step stretching, so that the diaphragm has excellent ductility and tensile strength.

The present invention relates to a polypropylene composition comprising a heterophasic propylene copolymer wherein the heterophasic propylene copolymer consists of: a propylene homopolymer matrix in an amount of 71 to 92 wt%, preferably 78 to 89 wt%, more preferably 84 to 89 wt%, based on the heterophasic propylene copolymer; an ethylene-propylene copolymer in an amount of from 8 to 29 wt%, preferably from 10 to 29, more preferably from 11 to 29 wt%, even more preferably from 11 to 22 wt%, even more preferably from 11 to 16 wt%, based on the heterophasic propylene copolymer; and wherein the amount of units derived from ethylene is 42 to 60% by weight, more preferably 42 to 55% by weight, more preferably 45 to 51% by weight, based on the ethylene-propylene copolymer, and wherein the polypropylene composition has a melt flow rate (MFR) in the range of 0.50 to 120 dg / min wherein the melt flow rate is determined using ISO 1133-1: 2011 using 2.16 kg at 230 DEG C, and wherein the polypropylene composition has a melt flow rate (MFR) in the range of 0.50 to 120 dg / min. And a methylene sequence ngt in an amount of units derived from ethylene based on the ethylene-propylene copolymer of less than 0.30; and 5.

The invention relates to the technical field of box body materials, in particular to a box body material and a preparation method and application thereof to a box body, by preparing a modified damping agent and a modified flame retardant and adding a degradable polymer into the modified damping agent and the modified flame retardant, when the box body material is applied to a sound box shell, the damping effect of the sound box shell can be well guaranteed; the environment-friendly, non-toxic and harmless box shell can be guaranteed, non-toxic and harmless treatment in the box body raw material preparation process is achieved, polyethylene glycol diacrylate and maleic anhydride grafted polyethylene are mixed, poisonous and harmful gas generated in the maleic anhydride grafted polyethylene can be effectively adsorbed during high-temperature treatment, and the environment-friendly, non-toxic and harmless box shell is obtained. The dispersity of the internal toxicity of the maleic anhydride grafted polyethylene is reduced; polycarbonate and polyethylene terephthalate are weighed in parts by weight, and are added into a high-speed mixer together with styrene butadiene rubber and ethylene-propylene copolymer, so that when the prepared box body material is applied to the sound box shell, the high-damping, high-flame-retardant and environment-friendly effects can be ensured.

The invention relates to the technical field of cables, and discloses a low-voltage cable with a self-cleaning function and a preparation method thereof.The low-voltage cable is prepared by adding an ethylene-propylene copolymer, polypropylene, amino-modified fluorosilane, epoxy nano-silicon dioxide, an antioxidant 1010 and modified phenolic resin into an internal mixer, mixing, extruding and molding. And carrying out hot press molding on the mixed material in a press vulcanizer to obtain the low-voltage cable with the self-cleaning function. In the banburying process, amino groups in the amino-modified fluorosilane, hydroxyl groups in the modified phenolic resin and epoxy groups in the epoxy nano silicon dioxide are subjected to ring-opening reaction, and a cross-linked network is formed among the amino groups and the hydroxyl groups, so that more cross-linked fulcrums exist, and the tensile property is better. A quaternary ammonium salt group contained in the amino-modified fluorosilane has a good self-cleaning function, and fluorine is introduced into the amino-modified fluorosilane, so that a smooth fluorine carbonization layer which is not easy to adhere to an object can be formed on the surface of the amino-modified fluorosilane, and therefore, the amino-modified fluorosilane also has a good self-cleaning effect.

The invention provides a multi-layer composite fiber sheet and a preparation method and application thereof, and belongs to the technical field of high polymer materials.The multi-layer composite fiber sheet is characterized in that at least one ethylene-propylene copolymer fiber layer (B) is added between at least two high-density polyethylene fiber layers (A) to form an A-B-A sandwich structure; a plurality of bonding points exist between the ethylene-propylene copolymer and the high-density polyethylene, bonding and curing are achieved, the self heat melting phenomenon cannot occur, and the mechanical property, the heat resistance, the air permeability, the opacity and the layering strength of the multi-layer composite fiber sheet are improved.

The present invention relates to a polypropylene composition comprising a heterophasic propylene copolymer wherein the heterophasic propylene copolymer consists of: a propylene homopolymer matrix in an amount of 71 to 92 wt%, preferably 78 to 89 wt%, more preferably 83 to 87 wt%, based on the heterophasic propylene copolymer; and an ethylene-propylene copolymer in an amount of from 8 to 29 wt%, preferably from 11 to 22 wt%, more preferably from 13 to 17 wt%, based on the heterophasic propylene copolymer; wherein the amount of units derived from ethylene is from 40 to 60% by weight, preferably from 42 to 55% by weight, more preferably from 43 to 51% by weight, based on the ethylene-propylene copolymer, and wherein the polypropylene composition has a number of units derived from ethylene by USA FDA 21 CFR PRG 177.1520; an n-hexane extract content of less than 5% by weight as determined on the olefin polymer (determined on the membrane); wherein a heterophasic propylene copolymer within a polypropylene composition is prepared by visbreaking an intermediate heterophasic propylene copolymer having an initial melt flow rate (MFR initial) of 1.0 to 25 dg / min, preferably 1.5 to 20 dg / min, as determined according to ISO 1133: 2011 using 2.16 kg at 230 DEG C, with a peroxide during melt mixing, the peroxide is in an amount such that a composition comprising a heterophasic propylene copolymer having a desired final melt flow rate (MFR final) of from 3 to 45 dg / min as determined according to ISO 1133: 2011 using 2.16 kg at 230 DEG C is obtained.

A lubricating oil composition contains 0.1 to 3.0% by mass of an ethylene-propylene copolymer having a weight average molecular weight of 5000 to 20000, and it is a lubricating oil composition for a helical gear mechanism.

The invention provides a high-temperature-resistant packaging bag film and a preparation method and application thereof, and belongs to the technical field of packaging. The high-temperature-resistant packaging bag film comprises an inner layer and an outer layer, and the inner layer is prepared from ternary co-polypropylene, ethylene-propylene copolymer and smooth opening master batch; the core layer comprises at least three first sub-layers made of block co-polypropylene and at least two second sub-layers made of heat-resistant homo-polypropylene, and the first sub-layers and the second sub-layers are stacked in an alternating mode; and the outer layer is prepared from heat-resistant homo-polypropylene and smooth open master batch. According to the high-temperature-resistant packaging bag film with the structural design, the mechanical property, the heat sealing performance and the processing adaptability are remarkably improved, the heat sealing temperature is low, the heat sealing strength is high, a firm and reliable seal can be formed, knife sticking is avoided in the bag making and hot cutting process, and the excellent impact resistance is achieved.

The present invention provides a vapor phase rust-proof cold stretch protective film, which comprises an inner layer, a middle layer and an outer layer from the inside out; the outer layer, by weight, comprises 70-80 parts of metallocene linear polyethylene, 20-30 parts of linear polyethylene and 1-4 parts of processing aid masterbatch as raw materials; the middle layer, by weight, comprises 5-30 parts of ethylene propylene copolymer and 70-95 parts of metallocene linear polyethylene as raw materials; the inner layer, by weight, comprises 60-80 parts of metallocene linear polyethylene, 20-30 parts of linear polyethylene, 2-10 parts of vapor phase rust-proof masterbatch and 1-4 parts of processing aid masterbatch as raw materials. The protective film of the present invention has excellent tensile strength and tear resistance, small permanent deformation, good flexure and resilience, and the cold stretch protective film produced using the material has excellent clamping force and weather resistance, high packaging efficiency during use, is not easily damaged, and can better improve production efficiency; when used as a protective film in the field of ferrous metal products, it has an excellent and long-lasting rust-proof effect.

A carbon fiber particle and a manufacturing method thereof are disclosed. The carbon fiber particle includes a plurality of reinforcing fibers and a resin material. The reinforcing fibers include a plurality of carbon fibers and a sizing agent composition. The sizing agent composition includes a sizing agent of an acrylate graft-modified polyurethane resin. The acrylate graft-modified polyurethane resin is graft-modified with a plurality of modifying monomers, and the modifying monomers are at least one selected from the group consisting of an alkyl-containing (meth)acrylate, a hydroxyl-containing (meth)acrylate, and a carboxyl-containing vinyl monomer. The resin material includes a polypropylene resin and a modified ethylene propylene copolymer. The modified ethylene propylene copolymer is a maleic anhydride-modified ethylene propylene copolymer. The weight ratio between the plurality of reinforcing fibers and the resin material is between 1:9 and 11:9. Thus, the adhesion between the plurality of reinforcing fibers and the resin material can be improved, so that the carbon fiber particle can have better mechanical properties.

The invention discloses a high-temperature-resistant solid tire tread material and application thereof, and relates to the technical field of nano modified materials. The material is composed of matrix resin, a reinforcing filler, a regenerated material and a composite cross-linking agent, wherein the matrix resin adopts an ethylene-propylene copolymer and maleic anhydride grafted ethylene-propylene copolymer composite system, and the grafting rate is 5-15 wt%; the reinforcing filler is iron-doped porous nano aluminum oxide; the regenerated material is polyester fiber recovered from waste tires; and the cross-linking system is prepared by carrying out plasma treatment on dicumyl peroxide and m-phenylenediamine bismaleimide. A gradient structure with the surface layer grafting rate of 15% and the core layer grafting rate of 5% is formed through a gradient pressing technology, and cross-linked network optimization is achieved in combination with a dynamic vulcanization technology. The material is particularly suitable for high-temperature heavy-load scenes such as harbor machinery and mining equipment, and the service life is prolonged by 2-3 times. Through the nano-porous structure design, gradient interface regulation and control and regeneration material cooperation, the high performance and environmental protection characteristics are achieved.

The invention provides a preparation method of a modified high-density polyethylene material, and relates to the field of high-density polyethylene materials. The modified high-density polyethylene material comprises 70%-85% of high-density polyethylene, 5%-15% of a flexibilizer, 3%-10% of an environmental stress cracking resistant modifier, 1%-5% of a heat stabilizer, 0.5%-2% of an antioxidant, 0.5%-3% of a nano inorganic filler and 0.5%-3% of other functional additives. By optimizing the combination of the flexibilizer, the environmental stress cracking resistance modifier, the heat stabilizer and the antioxidant, the problem that the environmental stress cracking resistance of the material is reduced due to the introduction of the modifier or filler in the prior art is effectively solved; the impact resistance and the flexibility of the material are improved.

The present invention relates to a blown film comprising a polypropylene composition comprising an ethylene-propylene copolymer and a polyethylene-polyethylene glycol block copolymer.

This invention discloses an inorganic-reinforced ethylene-propylene copolymer material and its preparation method, relating to the field of ethylene-propylene copolymer technology. The material, by mass parts, comprises: 30-70 parts ethylene-propylene copolymer, 10-20 parts modified starch, 10-30 parts ethylene-styrene copolymer, 5-12 parts maleic anhydride-grafted polyethylene, 1-10 parts montmorillonite, 1-10 parts magnesium oxide, and 0.01-1.0 parts initiator. The modified starch is obtained by oxidizing starch and then using (S)-1,2-epoxy-5-hexene as an etherification modifier. This invention introduces modified starch containing double bonds, giving the material a certain degree of biodegradability; utilizes ethylene-styrene copolymer and maleic anhydride-grafted polyethylene to improve heat resistance and starch dispersibility; and modifies montmorillonite and magnesium oxide with a coupling agent to form a cross-linked network with the matrix, producing a significant reinforcing synergistic effect. The resulting material possesses good thermal stability, rigidity, processing performance, and partial biodegradability, making it suitable for applications such as hot melt adhesives.

The present application relates to a kind of four-layer co-extrusion infusion film and its preparation process, using four-layer structure, film is composed of A layer, B layer, C layer and D layer. Wherein, A layer is the outer layer of product, thickness is 15-25 μm, is composed of polypropylene and styrene-ethylene-butadiene hydrogen block copolymer. B layer is the secondary outer layer of product, thickness is 10-15 μm, is composed of modified linear low density polyethylene. C layer is the intermediate layer of product, thickness is 130-160 μm, is composed of modified polyethylene. D layer is the inner layer of product, thickness is 10-30 μm, is composed of ethylene-propylene copolymer and styrene-ethylene-butadiene hydrogen block copolymer. The present application adopts four-layer co-extrusion down blowing process, and prepares the packaging suitable for various infusion. The present application not only guarantees the light transmittance, low temperature heat sealing property, heat sealing strength, printability, resistance to 121 ℃ cooking and other properties of film. Film material is compatible with the softness of traditional five-layer co-extrusion infusion film and the high strength characteristics of three-layer co-extrusion infusion film.

The invention discloses a stress-cracking-resistant and chemical-resistant ABS (Acrylonitrile Butadiene Styrene) composition as well as a preparation method and application thereof. The ABS composition is prepared from the following components in parts by weight: 58 to 92 parts of ABS resin; 3 to 32 parts of an ethylene-propylene copolymer; 2-10 parts of a compatilizer; wherein the compatilizer is SEBS (Styrene-Ethylene-Butylene-Styrene) grafted maleic anhydride. According to the invention, the ethylene-propylene copolymer is added into the ABS resin to improve the chemical resistance of the ABS resin, and the SEBS grafted maleic anhydride is added as a compatilizer which has a better compatilizer with the ABS resin, so that the chemical resistance and stress cracking resistance of the ABS composition are effectively improved by cooperating with the ethylene-propylene copolymer.

A tie layer composition with improved bonding in polypropylene multi-layer structures, and improved bonding in general under retort conditions is disclosed. The tie layer composition comprises two components, an ethylene-propylene copolymer and a maleic anhydride-grafted copolymer of ethylene and an a-olefin, preferably 1 -hexene, and is prepared by compounding the two components. Tie layers that comprise the novel composition and multi-layer films and sheets that incorporate tie layers made from the novel composition are also disclosed.