Ethylene Vinyl Acetate Copolymer

As the va content increases crystallinity decreases until at 50 the eva is.

Ethylene vinyl acetate copolymer.

Ethylene vinyl acetate eva copolymers ethylene vinyl acetates are leading polymers for hot melt manufacturing due to their high versatility. The ethylene vinyl acetate copolymer evac 40 vinyl acetate by weight. Eva copolymers are used in molded caps and seals footwear and car interiors. Both effects result in a lowering of the tg of the final copolymer.

The va comonomer interferes with chain packing reducing crystallinity and thus lowering t m and improving transparency when compared with ldpe. They are the base polymer in many adhesive resin formulations and in. On a weight basis ethylene is far more effective a fact that is reflected in the low tg of polyethylene homopolymer below 80 c. Eva based hot melts are able to fulfill various requirements in applications such as packaging bookbinding or label sticking.

Ethylene vinyl acetate eva is a random copolymer of ethylene and varying amounts of vinyl acetate va. In addition poly vinyl acetate ethylene vae copolymers possess enhanced toughness flexibility and serviceability. Visit chemicalbook to find more ethylene vinyl acetate copolymer 24937 78 8 information like chemical properties structure melting point boiling point density molecular formula molecular weight physical properties toxicity information customs codes.

Ethylene vinyl acetate eva copolymers are used in extrusion film processes for applications including packaging surface protection and greenhouse covers and in photovoltaic cell encapsulation. Elvax 40p was obtained from the du pont company wilmington de. Emblem in packaging technology 2012. Ethylene vinyl acetate eva copolymer resins.

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. There are three different types of eva copolymer which differ in the vinyl acetate va content and the way the materials are used. 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. Chemical formula diagram.

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