Ethylene Vinyl Alcohol::EVOH Resins - Introduction, Products, Patents, Process, Study, Company Profiles, Consultants

Ethylene Vinyl Alcohol EVOH , Technology, Products, Patents, Process, Study, Company Profiles, Consultants Primary Information Services Home. Polyvinyl Alcohol . Ordering Information. Contact
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Ethylene Vinyl Alcohol, commonly abbreviated EVOH, is a formal copolymer of ethylene and vinyl alcohol. Because the latter monomermainly exists as its tautomer acetaldehyde, the copolymer is prepared by polymerization of ethylene and vinyl acetate to give the ethylene vinyl acetate (EVA) copolymer followed by hydrolysis. EVOH copolymers are highly crystalline, and their properties are highly dependent on the relative concentration of the comonomers. Generally speaking, as the ethylene content increases, the gas barrier properties decreases, the moisture barrier properties improve, and the resins are processed more easily. One of the major applications for EVOH is in auto-motive fuel systems to control emissions of hydro-carbons from fuel lines and tanks. The first and foremost producer of EVOH (ethylene vinyl-alcohol copolymer resins) under the name EVAL™ and the manufacturer of KURARISTER™ film, today the Kuraray Group consists of about 70 companies, employing around 7,000 people worldwide. Ethylene vinyl alcohol copolymer (EVOH) is a barrier resin often used in multilayer food packages and blow-molded rigid containers. The production of EVOH is a two-step process of polymerization and saponification. First, ethylene and vinyl acetate are polymerized using an initiator/activator complex. Second, the ethylene-vinyl acetate copolymer (EVAc) is saponified to ethylene vinyl alcohol copolymer. Kuraray uses a proprietary system for copolymerization using solution polymerization with a heat exchanger. Their method entails simultaneously passing the solvent solution of vinyl acetate and discharged ethylene through a heat exchanger provided with a cooling means, thus, causing the solution of vinyl acetate to absorb and solubilize ethylene before the solution returns to the polymerization vessel. In the vessel, the vinyl acetate with solubilized ethylene is mixed with the polymerization solution. Saponification is done with a two-stage process patented by Kuraray to achieve a high degree of saponification (99.5%) with less alkali catalyst by using different conditions corresponding to the differences in reaction mechanism between initial and final stages of EVAc saponification. The process uses methanol as a solvent and a sodium hydroxide catalyst. The EVOH product is extruded into polymer pellets and stored for shipping.	Introduction Introduction of EVAL®EVOH for Geosynthetics Ethylene Vinyl Alcohol Copolymer (EVOH) Resins EVOH Msds EVAL Resin EV-3201V Polibarr Bioriented Coextruded EVOH Ethylene/vinyl alcohol copolymer Soarnol Barrier Resin Soarnol Products Multilayer high barrier sheet EVAL for Agricultural Films EVAL Resins in powder form DuPont Selar High Gas Barrier Resin EVAL EVOH film solutions for VIP laminates with an improved performance Processing Ethylene Vinyl Alcohol Copolymer Explained Preparation of vinyl alcohol groups containing polymer nanocomposites EVAL Processing Producing Co-extruded High Barrier Heat Shrinkable Packaging Films Unique technology from Kurarayof Study Changes in Physicochemical, Morphological and Thermal Properties Effects of Polymer Structure on Gas Barrier of (EVOH) Influence of processing on the ethylene-vinyl alcohol (EVOH) properties Oxygen Barrier and Enthalpy of Melting of Multilayer EVOH Films Plastic deformation of EVA, EVOH and their multilayers Step Change Improvements in EVOH Barrier Using MDO Synthesis and Characterisation of Novel Carboxylated EVOH Polymers Textures and Barrier Properties of EVOH Copolymer films Thermal and morphological behavior of EVOH Patents Ethylene vinyl alcohol copolymer blends Method for producing ethylene-vinyl alcohol copolymer resin Multilayered pellet comprising ethylene-vinyl alcohol copolymer resin composition Process for producing ethylene-vinyl alcohol copolymers Method for producing ethylene-vinyl alcohol copolymer resin composition Method for processing ethylene-vinyl alcohol copolymer solution Method for producing saponified ethylene-vinyl acetate copolymer Method of producing hydrous ethylene-vinyl alcohol copolymer composition	Applications The better barrier for fuel containment Building Better Barrier Packaging solutions for sliced Cheese The better barrier for construction The better barrier for cosmetic packaging A guide to Polyolefin Film Extrusion Hydrogen fuel cell systems New EVAL EVOH Resins for Flexible Packaging EVAL™ EVOH barrier resins Synthesis , Characterization and Applications of EVOH Copolymers Market Kuraray: EVOH demand to grow EVOH resin global demand growth rate of more than 10% A review of the past and a Look at the future Ethylene-Vinyl Alcohol Resins Company Profiles Company from China Company from Japan Another Company from Japan Company from US Company from Victoria Reports Financial Results for 1stHalf of FY2011 Kuraray plans $49 million production expansion at Pasadena plant Soarus L.L.C. Introduces New Nichigo G-Polymer Biodegradable, Water Soluble, Extrudable, High Barrier An Update on the Development of TIF Mulching Films EVAL completes world's largest EVOH resin plant Suppliers Suppliers List List of Suppliers Manufacturers List Wholesalers Consultants Consultant from Chennai Consultant from Florida Consultant from UK Expert Plant Information and Turnkey Plant Company from Korea Company from Germany Company from Guangzhou New material offers plasticity and high gas impermeability Production Begins of EVAL SP EVAL Production Expansion, Antwerp, Belgium Order the CD ROM Today
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