What Is Ethylene Vinyl Acetate

It is the basis of many hot melt adhesives when blended with a petroleum wax and a resin tackifier.

What is ethylene vinyl acetate. Eva ethylene vinyl acetate this copolymer resin can be used in adhesives sealants and coatings. It readily evaporates into air and dissolves easily in water. Ethylene vinyl acetate copolymer eva for instance is produced by the copolymerization of ethylene and vinyl acetate under pressure using free radical catalysts. Ethylene is now the preferred feedstock for vam vinyl acetate monomer largely replacing the earlier acetylene based process.

Vinyl acetate is a clear colorless liquid. Ethylene vinyl acetate eva also known as poly ethylene vinyl acetate peva is the copolymer of ethylene and vinyl acetate the weight percent of vinyl acetate usually varies from 10 to 40 with the remainder being ethylene. Ethylene vinyl acetate copolymer does not have an acid odor if it is not thermally degraded. It has a sweet pleasant fruity smell but the odor may be sharp and irritating to some people.

It is a polymer that approaches elastomeric materials in softness and flexibility yet can be processed like other thermoplastics. Also it imparts plastic like properties that enable wax to compete effectively with high quality polymeric coatings. Many different grades are manufactured with the vinyl acetate content varying from 5 to 50 percent by weight. The major industrial route involves the reaction of ethylene and acetic acid with oxygen in the presence of a palladium catalyst.

Vinyl acetate ethylene vae emulsions are based on the copolymerization of vinyl acetate and ethylene in which the vinyl acetate content can range between 60 and 95 percent and the ethylene content ranges between 5 and 40 percent of the total formulation. Vam is usually produced by the catalysed vapour phase reaction of acetic acid with ethylene and oxygen in a fixed bed tubular reactor using a supported noble metal catalyst. This product should not be confused with the ethylene vinyl acetate eva copolymers. Since vinyl alcohol is highly unstable with respect to acetaldehyde the preparation of vinyl acetate is more complex than the synthesis of other acetate esters.

The food and drug administration fda has stated that ethylene vinyl acetate is safe when used in food production packaging or transportation and it s not an especially dangerous material. Vinyl acetate is the acetate ester of vinyl alcohol. Eva copolymers are more. 47 but elevated temperature and presence of some additives for example high amounts of clay cause the production of pungent acetic acid odor which is a product of thermal degradation of ethylene vinyl acetate copolymer.

Ethylene vinyl acetate also known as eva is the copolymer of ethylene and vinyl acetate the weight percent vinyl acetate usually varies from 10 to 40 with the remainder being ethylene.