Polyethylene Vinyl Acetate Copolymer

On a weight basis ethylene is far more effective a fact that is reflected in the low tg of polyethylene homopolymer below 80 c.

Polyethylene vinyl acetate copolymer.

A copolymer having a vinyl acetate content of 28 wt shows a melting temperature of 70 c for the polyethylene crystallites. In addition poly vinyl acetate ethylene vae copolymers possess enhanced toughness flexibility and serviceability. The cross linking does not significantly influence the melting temperature. They are thermoplastic solids with a range of molecular weights typically supplied in the form of small beads.

Many different grades are manufactured with the vinyl acetate content varying from 5 to 50 percent by weight. There are three different types of eva copolymer which differ in the vinyl acetate va content and the way the materials are used. Ethylene vinyl acetate copolymer eva for instance is produced by the copolymerization of ethylene and vinyl acetate under pressure using free radical catalysts. Some applications require a 100 dry solids polymer that can be pre mixed with other solid additives.

Synthomer s polyvinyl acetates homopolymers and acid copolymers of vinyl acetate. 3 the monomer vinyl acetate was first produced on an industrial scale by the addition of acetic acid to acetylene with a mercury i salt 4 but it is now primarily made by palladium catalyzed oxidative addition of acetic acid to ethylene. Poly ethylene vinyl acetate 1 product result match criteria. Selectophore 91 vinyl chloride 3 vinyl acetate 6 vinyl.

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. Copolymer of vinyl chloride vinyl acetate and vinyl alcohol cas number. Ethylene vinyl acetate eva copolymer is a redispersible polymer a vailable as a free flowing powder that can easily be redispersed to form a latex dispersion. Eva copolymers are more permeable to.

Eva copolymers are used in molded caps and seals footwear and car interiors. 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. Poly vinyl acetate was discovered in germany in 1912 by fritz klatte.