What Is Ethylene Vinyl Acetate Copolymer

The major industrial route involves the reaction of ethylene and acetic acid with oxygen in the presence of a palladium catalyst.

What is ethylene vinyl acetate copolymer. Ethylene vinyl acetate or eva is a copolymer of ethylene and vinyl acetate with a structure as shown below. The va comonomer interferes with chain packing reducing crystallinity and thus lowering t m and improving transparency when compared with ldpe. 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. Vinyl acetate is used to make other industrial chemicals such as polyvinyl acetate polymers and ethylene vinyl acetate copolymers.

On a weight basis ethylene is far more effective a fact that is reflected in the low tg of polyethylene homopolymer below 80 c. Ethylene vinyl acetate eva is a random copolymer of ethylene and varying amounts of vinyl acetate va. As the va content increases crystallinity decreases until at 50 the eva is. The food and drug administration fda has determined that.

These other chemicals are used mostly to make glues for the packaging and building industries. 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. They are also used to make paints textiles and paper. Ethylene vinyl acetate is a type of plastic a polymer with a wide variety of uses both residential and industrial.

There are three different types of eva copolymer which differ in the vinyl acetate va content and the way the materials are used. Both effects result in a lowering of the tg of the final copolymer. Vinyl acetate is the acetate ester of vinyl alcohol. Other articles where ethylene vinyl acetate is discussed.

Ethylene vinyl acetate copolymer eva for instance is produced by the copolymerization of ethylene and vinyl acetate under pressure using free radical catalysts. It is an extremely elastic and tough thermoplastic of excellent clarity and gloss and with little odor. Many different grades are manufactured with the vinyl acetate content varying from 5 to 50 percent by weight. Ewg s skin deep rates thousands of personal care product ingredients culled from ingredient labels on products based on hazard information pulled from the scientific literature and industry academic and regulatory databases.

Eva has many attractive properties including low cost excellent adhesion to many polar and nonporous substrates good flex crack and.