Ethylene Vinyl Acetate Polymerization Process

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Ethylene vinyl acetate polymerization process.

Authority us united states prior art keywords ethylene vinyl acetate weight copolymer water prior art date 1951 09 04 legal status the legal status is an assumption and is not a legal conclusion. Ethylene vinyl acetate polymerization process download pdf info publication number. Eva generally contains 1 50 of the va comonomer along the carbon chain backbone. The application of factorial experiments to optimize the ethylene vinyl acetate emulsion polymerization process is described herein.

To ensure good product properties and to optimize conversion and production rates the polymerization reaction is carried out at 2000 2600 bar tubular. There are three different types of eva copolymer which differ in the vinyl acetate va content and the way the materials are used. The ethylene vinyl acetate eva copolymer can be prepared by copolymeriztion of ethylene and vinyl acetate then alcoholized to form ethylene vinyl alcohol evoh copolymer. 12 8 1 ethylene vinyl acetate eva is a copolymer of ethylene and vinyl acetate va segments typically formed via free radical polymerization.

The evoh copolymer is an excellent oxygen barrier due to its recyclability and transparent nature which makes it an ideal film for food packaging 1 2. A prior extensive experimental phase identified those variables that are most important for ethylene vinyl acetate emulsion copolymer production. Process description versalis tubular and autoclave processes are based on high pressure free radical initiated polymerization of ethylene and vinylacetate monomers to give eva. Accordingly the present invention relates to a process for the production of ethylene vinyl acetate copolymers containing from 30 to 80 by weight copolymerized vinyl acetate by bulk polymerization of the monomers by the high pressure method under pressures of 500 to 5 000 bar and preferably under pressures of 1 000 to 3 000 bar characterized in that the polymerization is carried out in the presence of from 50 ppm to 2 by weight and preferably in the presence of from 100 ppm to 1 by.

Synthesizing vae emulsions 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. 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 c4h6o2 cid 7904 structure chemical names physical and chemical properties classification patents literature biological activities safety.