818 results about "Ethylene vinyl alcohol copolymer" patented technology

Packaging laminate for packages for liquid foods having excellent liquid and oxygen gas barrier properties in which all included layers are biodegradable. The packaging laminate includes at least one liquidtight layer (11, 13) of homo or copolymers of monomers selected from a group consisting of lactic acid, glycol acid, lactide, glycolide, hydroxy butyric acid, hydroxy valeric acid, hydroxy caproic acid, valerolactone, butyrolactone and caprolactone, as well as an oxygen gas barrier layer (12) of ethylene vinyl alcohol, polyvinyl alcohol, starch or starch derivatives. The oxygen gas barrier layer is preferably applied by a dispersion coating process. The layers may be laminated directly to one another or indirectly by means of interjacent adhesive layers. The packaging laminate may also include a core layer of, for example, paper or paperboard, or a biopolymer. The invention also realises a method of producing the biodegradable packaging laminate according to the invention.

A laminated article includes a substrate of a building material; and an adaptive vapor retarder film adhered to the substrate. The film is selected as being at least one from the group consisting of: ethylene vinyl alcohol (EVOH), EVOH coextruded or laminated with at least a second polymer, a blended polymer comprising EVOH, or a combination of these materials.

Provided is a resin composition comprising 1-99% by weight of a modified ethylene-vinyl alcohol copolymer (C) having an ethylene content of 5-55 mol %, which contains a specific structural unit (I) in an amount of 0.3-40 mol % and can be obtained by reacting an ethylene-vinyl alcohol copolymer (A) with a monofunctional epoxy compound (B) having a molecular weight of not more than 500, and 1-99% by weight of a thermoplastic resin (T1) other than (C). Moreover, a multilayer structure in which the resin composition and a thermoplastic resin (T2) are laminated is also provided. Thus, a resin composition superior in barrier properties, transparency, stretchability, flexibility, flexing resistance and interlayer adhesiveness and various kinds of molded articles made thereof are provided.

The present invention generally relates to a barrier coating composition for application to a thermoplastic film comprising (a) a nano-clay additive in an amount from about 1 wt % to 50 wt % of said barrier coating, wherein said nano-clay additive comprises untreated nano-clay platelets; and (b) a base coating in an amount from about 50 wt % to 99 wt % of said barrier coating, wherein said base coating comprises a polymer selected from the group consisting of polyvinylidene chloride (PVdC), poly(vinyl)alcohol (PVOH), ethylene vinyl alcohol (EVOH), acrylate copolymers and mixtures thereof.

Multilayer laminated shrink films that have good interlayer adhesion comprise at least three layers, a first layer comprising a polymer selected from the group consisting of polyamides, ethylene vinyl alcohol copolymers and mixtures thereof, a second adhesive layer consisting essentially of a blend of a functionalized polymer component, an ethylene copolymer component and a tackifier and a third layer comprising a polymer selected from the group consisting of polyethylene homopolymers, ethylene copolymers, polypropylene homopolymers, propylene copolymers, polyesters, polyamides, polyvinyl chloride, polycarbonates, and mixtures thereof The adhesive layer is positioned between and contacts the first and third layers.

The present invention provides a multiple layer structure (10) for fabricating medical products. The layer structure (10) has a core layer (14) of an ethylene vinyl alcohol copolymer having an ethylene content of about 25-45 mole percent, a solution contact layer of a polyolefin positioned on a first side of the core layer, an outer layer (12) positioned on a second side of the core layer opposite the solution contact layer (16), the outer layer (12) being selected from the group consisting of polyamides, polyesters and polyolefins; two tie layers (18)-one of each adhered to the first and second sides of the core layer (14) and positioned between the solution contact layer (16) and the core layer (14) and between the outer layer (12) and the core layer (14), and wherein the structure (10) is produced in a cast coextrusion process.

To prepare a shaped product comprising a thermal adhesive fiber under moisture and having a fiber aggregate nonwoven structure. In the shaped product, the thermal adhesive fibers under moisture are melted to bond to fibers constituting the fiber aggregate nonwoven structure and the bonded fiber ratio is not more than 85%. The shaped product has an apparent density of 0.05 to 0.7 g/cm³, a maximum bending stress of not less than 0.05 MPa in at least one direction, and a bending stress of not less than ⅕ of the maximum bending stress at 1.5 times as large as the bending deflection at the maximum bending stress. The moistenable-thermal adhesive fiber may be a sheath-core form conjugated fiber comprising a sheath part comprising an ethylene-vinyl alcohol-series copolymer and a core part comprising a polyester-series resin. Such a shaped product can be used for a building board or the like since the shaped product has a high bending stress although the product is light and has a low density.

Oxygen barrier films exhibiting high oxygen scavenging capability suitable for extended shelf-life, packaging applications. These films comprise a polyamide homopolymer, copolymer, or blends thereof; an ethylene vinyl alcohol copolymer; an oxidizable polydiene; and at least one metal salt catalyst. These films are particularly suited to making high barrier, retortable packaging structures such as pouches, containers etc. Such articles are useful for packaging a variety of oxygen-sensitive foods, beverage, medical and health care products.

This invention relates to a multiple layer thermoplastic structure, use of the said structure for manufacturing a tank, and a tank comprising the said structure. Multi-layer thermoplastic structure of the said invention comprising at least one layer composed of an ethylene-vinyl alcohol copolymer with a density of between 0.94 and 1.4, and a melt flow index of between 1.3 and 4.2 g/10 minutes at a temperature between 170 and 240° C. It is used for manufacturing gas tanks.

To provide a resin composition including: an ethylene-vinyl alcohol copolymer (A) having an ethylene content of from 15 to 65 mol % and a saponification degree of at least 95 mol %, a phosphoric acid salt (B) which can form a hydrate, and a conjugated polyene compound (C) having a boiling point of at least 150° C., wherein the resin composition comprises from 50 to 99 parts by weight of (A), from 1 to 50 parts by weight of (B) and from 0.00001 to 1 parts by weight of (C), based on 100 parts by weight of the total amounts of (A) and (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.

A coextruded multilayer film includes a core layer including a polyamide; two intermediate layers each including an ethylene vinyl alcohol copolymer; a first and second outer layer each including an olefinic copolymer or an amorphous cyclic olefin copolymer; and two tie layers each adhering an intermediate layer to a respective outer layer; the ethylene vinyl alcohol copolymer of the first intermediate layer having a mole % ethylene at least 5 greater than the mole % ethylene of the ethylene vinyl alcohol copolymer of the second intermediate layer An aseptic package includes a sterilized food product, and a sterilized pouch in which the sterilized food product is disposed, the sterilized pouch including the film of the invention. A method of making an aseptic package is also disclosed.

The invention provides a high strength wood-plastic coated coextruded composite material. The material is composed of a core layer and a coating layer. The coating layer coats the surface of the core layer through a co-extrusion technology, biomass powder in the core layer is improved to a biomass fiber material, because of a large length-diameter ratio, the biomass fiber material not only plays a "filling" role in a wood-plastic composite material, but also plays a "reinforcing" role, greatly improves the mechanical properties of the composite material, especially improves the impact resistance, creep resistance and other properties, thereby broadening the application scope of the wood-plastic composite material. In addition, the coating layer involved in the invention preferably contains ethylene-methyl acrylate copolymer resin, ethylene-vinyl alcohol copolymer resin and high strength fiber, thus being conducive to further enhancing the mechanical properties of the composite material and the binding force with the core layer.

A multi-layer structure comprising a layer of an ethylene-vinyl alcohol copolymer (A), a layer of a carboxylic acid-modified polyolefin (B), a layer of a thermoplastic resin (C) having a solubility parameter of 11 or less, and a layer of a resin composition (E), wherein the resin composition (E) comprises an ethylene-vinyl alcohol copolymer (A), a carboxylic acid-modified polyolefin (B), a thermoplastic resin (C) and a thermoplastic resin (D) having at least one functional group selected from the group consisting of a boronic acid group and boron-containing groups capable of being converted into a boronic acid group in the presence of water, and the layer of an ethylene-vinyl alcohol copolymer (A) is laminated with the layer of a thermoplastic resin (C) or the layer of a resin composition (E) through the layer of a carboxylic acid-modified polyolefin (B). This provides a multi-layer structure which allows effective reuse of regrind and which is excellent in impact resistance and gas barrier properties.

An object of the present invention is to provide: a film which is applicable to a tire, has excellent gas barrier properties and bending resistance, allows weight of a tire to be reduced with improving internal pressure retainability of the tire at both the brand-new stage and the used stage thereof, and is capable of demonstrating good gas barrier properties without breaking especially in a running condition at a relatively low temperature in winter time or the like; an inner liner for tire, using the film; and a tire provided with the inner liner for tire. The film of the present invention comprises at least a layer composed of resin composition (D) produced by dispersing viscoelastic substance (C) in a resin containing modified ethylene-vinyl alcohol copolymer (B) obtained by subjecting ethylene-vinyl alcohol copolymer (A) to a reaction, wherein 100% modulus at −30° C. of the viscoelastic substance (C) is smaller than 6 MPa. The inner liner for tire, and the tire, of the present invention are an inner liner for tire, using said film, and a tire provided with said inner liner for tire, respectively.

A coextruded multilayer film includes a core layer including an ethylene vinyl alcohol copolymer; two intermediate layers each including a polyamide; a first outer layer comprising an amorphous cyclic olefin copolymer; a second outer layer comprising an amorphous cyclic olefin copolymer or an olefinic copolymer; and two tie layers each adhering an intermediate layer to a respective outer layer. An aseptic package includes a sterilized food product, and a sterilized pouch in which the sterilized food product is disposed, the sterilized pouch including the coextruded multilayer film of the invention. A method of making an aseptic package is also disclosed.

The present invention discloses one kind of multilayer high blocking film for packing liquid material, the multilayer high blocking film includes polyethylene-based heat sealing layer(s), blocking polymer layer(s) preferably of ethylene-vinyl alcohol copolymer, PVA or polyvinylidene dichloride; and protecting layer(s) of polypropylene, polyester, etc. It has the total thickness below 80 micron, preferably of 55-65 micron. The present invention discloses also the making process of the multilayer high blocking film.

A printed sterilizable laminate for aseptic packaging includes two films each including a core layer including ethylene vinyl alcohol copolymer, polymeric adhesive, or polyamide; first and second intermediate layers each including a polyamide; an outer layer including amorphous cyclic olefin copolymer, or a blend of amorphous cyclic olefin copolymer and at least one olefinic copolymer; an inner layer including olefinic copolymer, or a blend of an olefinic copolymer and amorphous cyclic olefin copolymer; and first and second tie layers adhering the intermediate layers to the outer and inner layers respectively; a printed image disposed on the outside surface of the first film, or the inside surface of the second film; and an adhesive that bonds the outer layer of the first coextruded film to the inner layer of the second coextruded film. An aseptic package, and a method of making an aseptic package are also disclosed.

The present invention relates to a method of producing an ethylene-vinyl alcohol copolymer resin.

The present invention provides to an ethylene-vinyl alcohol copolymer composition excellent in neck-in reduction, stretching properties and further, gas barrier properties and a multilayer structure using the same. The ethylene-vinyl alcohol copolymer composition of the present invention is the blend of two or more ethylene-vinyl alcohol copolymers and at least one of the copolymers has the following structural unit (1).

(wherein X represents any binding chain excluding an ether bond, each of R¹ to R⁴ represents independently any substituent and n represents 0 or 1).

Preferably, the ethylene-vinyl alcohol copolymer having the structural unit (1) is obtained by hydrolyzing of a copolymer of 3,4-diacyloxy-1-butene, a vinyl ester monomer and ethylene.

A coextruded multilayer film includes a core layer including an ethylene vinyl alcohol copolymer; two intermediate layers each including a blend of an amorphous polyamide having a glass transition temperature of at least 80° C., and a semicrystalline polyamide; two outer layers each including an olefinic polymer; and two tie layers each adhering an intermediate layer to a respective outer layer; wherein the film exhibits an elongation at yield (ASTM D 882) of less than 15% in each of the longitudinal and transverse directions, and a free shrink (ASTM D 2732) at 200° F. of less than 8% in each of the longitudinal and transverse directions. An aseptic package includes a sterilized food product, and a sterilized pouch in which the sterilized food product is disposed, the sterilized pouch including the coextruded multilayer film of the invention. A method of making an aseptic package is also disclosed.

A film structure having an inner barrier layer comprised of a blend of a polyamide and ethylene vinyl alcohol copolymer. The polyamide is present in the blend in an amount of from 15-40%, and most preferably from 25-30%. The inner barrier layer is laminated on each side with a layer of a polyamide. The preferred polyamide is nylon, and particularly nylon 6. In a preferred embodiment, the film structure is layered with an oxide or ceramic layer. Included is a method of manufacturing the film and for using the film structure to package a product in a retort packaging process.

The present invention relates to a thermoplastic resin composition which excels in impact resistance, dimension stability and rigidity, and also excels in appearance, fluidity and paint film adhesion property, and further which is very useful as manufacturing materials for exterior parts of automobile. A thermoplastic resin composition comprising component (A): a polyamide resin; component (B): a hydrogenated product of block copolymer comprising vinyl aromatic polymer block (a) and conjugated diene based polymer block (b), and/or ethylene-α-olefin based block copolymer; component (C): a modified hydrogenated product of block copolymer comprising the vinyl aromatic polymer block (a) and the conjugated diene based polymer block (b), which hydrogenated product is modified by addition of an unsaturated acid and/or derivative thereof; component (D): a plate-like and/or needle-like inorganic filler; and component (F): an ethylene-vinyl alcohol copolymer and/or a partial saponified product of ethylene-vinyl acetate copolymer.