Adhesives raw material. (Materials).

Levamelt is a product-family name used for a series of ethylene and vinyl acetate copolymers where the vinyl acetate ranges from 40-80%. Suitable for a broad range of adhesive applications, either as a hot melt or solvent-borne adhesive, Levamelt properties can be specifically tailored to a diverse variety of applications. Ethylene vinyl acetate (EVA) copolymers are said to be well known as adhesives. The EVAs normally have a vinyl acetate content of less than 40%, but the company is said to achieve significant improvements with Levamelt grades containing 40-80%. There is said to be a direct relationship between a lower vinyl content and lower elasticity and modulus, according to the company. Compared with EVA copolymers of lower vinyl acetate content, Levamelt is said to offer improved adhesion characteristics, better low temperature adhesion. and is particularly useful in the formulation of pressure sensitive hot-melt adhesives, according to the company. Levamelt as an ethylene-vinyl alcohol (EVOH) modifier may help address some of the inherent limitations associated with the use of EVOH, such as thermoformability, processability, flexibility, retortion behavior, delamination, flexcrack resistance and gel formation at long residence time during extrusion, according to the company. (Bayer)

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