828 results about "Ethylene vinyl alcohol copolymer" patented technology

The invention provides a high-barrier layer flexible packaging film for isolating contents of a polymer lithium battery. The high-barrier layer flexible packaging film comprises at least two kinds of films which are combined to form a layer of composite film, wherein the composite film comprises a basic layer, a functional layer and a heat sealing layer; the high-barrier layer flexible packaging film is characterized in that: the basic layer is a copolymer film prepared by combining at least two film base materials of PP (polypropylene), CPP (chlorinated polypropylene or casting polypropylene), PE (polyethylene), PET (poly(ethylene terephthalate)), PA (polyamide) or MXD6 (aromatic polyimide), MPE (elastomer blend), PVDC (polyvinyl dichloride), EVOH (ethylene-vinyl alcohol), PEN (polyethylene naphthalate) and GT, or by complexing pairwise; and a high-barrier water-tolerant modified PVA (poly vinyl alcohol) coating film is coated on the copolymer film base materials. The high-barrier layer flexible packaging film has excellent gas barrier property, remarkably low oxygen permeability, water resistance, corrosion resistance, good high temperature resistance and great barrier property, and resists organic solvents and highly-volatile substances. In the invention, the high-barrier PVA is preferably coated on various base materials to obtain a base layer serving as a high-barrier layer which has great barrier property and excellent performance in resisting gas, water, corrosion, ultraviolet rays and the like.

The present invention relates to a nanocomposite blend composition having superior barrier properties, and more particularly to a nanocomposite blend composition comprising a polyolefin resin; one or more nanocomposites having barrier properties, selected from an ethylene-vinyl alcohol (EVOH) / intercalated clay nanocomposite, a polyamide / intercalated clay nanocomposite, an ionomer / intercalated clay nanocomposite, and a polyvinyl alcohol (PVA) / intercalated clay nanocomposite; and a compatibilizer. This nanocomposite blend composition has superior mechanical strength and superior barrier properties to oxygen, organic solvent, and moisture. Also, it has superior chemical barrier properties and is applicable to single / multi-layer blow molding and film processing.

The invention discloses a highly obstructed multilayer coextrusion thermal shrink film which comprises a heat sealing layer, an outer surface layer, an obstruction layer and a bonding layer, wherein the heat sealing layer, the outer surface layer and the obstruction layer are contacted with a packaged object, and the bonding layer connects the outer surface layer, the heat sealing layer and the obstruction layer; the heat sealing layer comprises polyolefin resin; the outer surface layer comprises polyethylene with middle density and the like; the obstruction layer comprises at least one layer of one out of ethylene-vinyl alcohol copolymer or polyamide or the mixture of the two; and the structure of the multilayer coextrusion thermal shrink film has 5-9 layers. The highly obstructed multilayer coextrusion thermal shrink film has good oxygen obstruction performance and higher tensile strength, and even objects sensitive to air cannot suffer from the risk that the color is changed or even aged or the food flavor is changed due to entrance of oxygen after being stored for a longer time. Furthermore, the structure of the outer layer can improve the optical property, the mechanical property, the surface printing capability and the stretching capability, and resist high temperature sealing and burning.

The invention discloses a high-separation multilayer joint-extrusion shrink film, which comprises an outer surface layer, a separation layer, a heat sealing layer and two bonding layers. The two bonding layers are respectively located between the separation layer and the outer surface layer and between the separation layer and the heat sealing layer, the separation layer is made of one of or a combination of two of ethylene vinyl alcohol (EVOH) resin, polyvinylidene chloride resin and modified polyamide resin, the thickness of the separation layer is 10%-45% of the total thickness, the thickness of the outer surface layer is 3%-5% of the total thickness, the thickness of the heat sealing layer is 25%-35% of the total thickness, the thickness of the bonding layers is 10%-30% of the total thickness, and the number of the separation layer is one or three. The outer surface layer of the film is made of high-melting-point resin to overcome the shortcoming that users are easy to burn during a using process of products, simultaneously oxygen and water vapor separation performance are good, the anti-puncturing effect and heat sealing strength are good, and the high-separation multilayer joint-extrusion shrink film can be suitable to vacuum shrink package of chilled pork, cheese products and seafood products.

The invention relates to a method for preserving the stability of a hemoglobin blood substitute comprising maintaining the hemoglobin blood substitute in an atmosphere substantially free of oxygen. The method for preserving a deoxygenated hemoglobin blood substitute comprises maintaining the deoxygenated hemoglobin blood substitute in an oxygen barrier film overwrap package. In one embodiment, the package comprises a transparent laminate material comprising an oxygen barrier layer and a polyolefin layer, wherein the laminant has a thickness of between about 0.001 and about 0.01 inches (or about 0.0254 to about 0.254 millimeters) and an oxygen permeability of less than about 0.01 cubic centimeters per 100 square inches (or about 0.01 cc per 645 square centimeters) over 24 hours at 1 atmosphere and at about 23° C. The oxygen barrier layer comprises ethylene vinyl alcohol. Aso provided herein is a preserved deoxygenated hemoglobin blood substitute comprises a deoxygenated hemoglobin blood substitute and an oxygen barrier film overwrap package. The package comprises a transparent laminant material comprising an oxygen barrier layer and a polyolefin layer. Said oxygen barrier layer has an oxygen permeability of less than about 0.01 cubic centimeters per 100 square inches (or about 0.01 cc per 645 square centimeters) over 24 hours at 1 atmosphere and at about 27° C. room temperature, wherein the deoxygenated hemoglobin blood substitute is sealed within the overwrap package. In one embodiment, the oxygen barrier layer comprises ethylene vinyl alcohol.

Oxygen barrier polymer compositions exhibiting high oxygen scavenging capability suitable for extended shelf-life, packaging applications. These polymer compositions comprise at least one ethylene vinyl alcohol copolymer, at least one oxidizable polydiene, and at least one metal salt catalyst. The polymer products are particularly suited to making barrier packaging articles such as monolayer or multi-layer films, sheets, tubes, pipes, thermoformed containers and coinjection / coextrusion blow molded bottles comprising PET, polyolefin or polycarbonate as structural layers. Such articles are useful in a variety of oxygen-sensitive food, beverage, pharmaceutical and health care product packaging applications.

A nanocomposite composition having superior barrier properties and an article comprising the same are provided. The nanocomposite composition includes: a polyolefin resin; a nanocomposite having barrier properties, and including intercalated clay and one or more resins having barrier properties, and a compatibilizer. The resin having barrier properties comprises an ethylene-vinyl alcohol copolymer, a polyamide, an ionomer, a polyvinyl alcohol, or a combination comprising one or more of the foregoing resins. The nanocomposite composition has superior mechanical strength and can form a strong barrier to oxygen, organic solvent, and moisture. Also, the nanocomposite composition has superior chemical barrier properties and can be used in single / multi-layer blow molding and film processing.

To provide a resin composition comprising an ethylene-vinyl alcohol copolymer (A) having an ethylene content of from 15 to 65 mol % and a degree of saponification of 95 mol % or more, a phosphoric acid salt (B) which can form a hydrate, and a dispersing agent (C), wherein the dispersing agent (C) comprises at least one species selected from the group consisting of aliphatic acid salts, glycerol aliphatic acid esters and aliphatic acid amides, the resin composition comprises (A) and (B) in amounts of from 50 to 99 parts by weight and from 1 to 50 parts by weight, respectively, based on 100 parts by weight of (A) and (B) in total, and the resin composition comprises (C) in an amount of from 1 to 20 parts by weight based on 100 parts by weight of (B). This resin composition excels in gas barrier property and also in moisture resistance at high temperatures and high humidities. Therefore, it is suitable for food packaging containers to be retorted.