Elvax®

Ethylene has also been copolymerised with a number of non-olefinic monomers and of the copolymers produced those with vinyl acetate have so far proved the most significant commercially . The presence of vinyl acetate residues in the chain reduces the polymer regularity and hence by the vinyl acetate content the amount of crystallinity may be controlled. Copolymers based on 45% vinyl acetate are rubbery and may be vulcanised with peroxides. They are commercially available (Levapren). Copolymers with about 30% vinyl acetate residues (Elvax-Du Pont) are flexible resins soluble in toluene and benezene at room temperature and with a tensile strength of about lOOOlbf/in (6.9 MPa) and a density of about 0.95 g/cm. Their main uses are as wax additives and as adhesive ingredients. 

Airflex, Alcudia, AmscoRes, Elvace, Elvax, Escorene, Evatane, Levapren, Meva, Mowilith, Riblene, Sumikaflex,Vinivil,Vinnapas,WackerVAE. .. 

Elvax Poly(ethylene-co-vinyl acetate) DuPont... 

Elvax. DuPont Co trademark for a series of high.molecular weight vinyl resins. They are translucent white, amorphous copolymers, wax-compatible but in sol in aqueous mixts and in most polar solvents. Used as a wax additive to improve its toughness, its heat-seal bond strength.and to reduce flaking. 

Ref 94 covers studies involving use of Mobil-wax 2300 microcrystalline wax, paraffin wax, ethylene vinyl acetate copolymer (Elvax 40,... 

ElvaX Regression program, 513 EMPA. See Electron microprobe analysis... 

Formula for Beva 371B Elvax Resin Grade 150, 500 g Ketone N. Resin,... 

Nemours, Wilmington, DE). A predetermined volume of Elvax-40 casting solution is mixed with a given amount of test molecule on a flat surface and the polymer is allowed to dry under a laminar flow hood. After drying, the film sequestering the compound is cut into 1 X 1 X 0.5 mm pieces. Empty pellets of Elvax-40 are used as controls. 

Ethylene/ethylene vinyl acetate/ unsaturated acids Plexars Elvax 4000 Orevacs CXA Resin Chemplex Du Pont Atochem Du Pont Polyamides, ionomers... 

Ethylene/methacrylic acid Elvax II Nuerel Du Pont Polyesters... 

Elvax . [DuPont DuPont UK] EVA copolymer for coating and adhesive ai lics., specialty inks and lacquers, for blending with waxes. 

Certain copolymers of ethylene and vinyl acetate, poly[ethylene-co-(vinyl acetate)] (EVAc, ELVAX , Dupont Corp.), have exceptionally good biocompatibility and are therefore widely used in implanted and topical devices. 

The copolymer is synthesized by free-radical polymerization from ethylene and vinyl acetate. The most commonly used EVAc (ELVAX-40, DuPont) consists of 40% vinyl acetate, with a low degree of crystallinity (5-20%). EVAc is hydrophobic it swells less than 0.8% in water [28]. 

Polymers. The polymers used in this study Included ethylene - (18 wt%) vinyl acetate, EVA (Du Pont Elvax 460) ethylene (65... 

Elvax 150 softens to a viscous melt above 70°C, and therefore Is not suitable for temperature service above 70°C when employed In a fabricated module. A cure system was developed for Elvax 150 that results In a temperature-stable elastomer ( ). Elvax 150 was also compounded with an antioxidant and UV stabilizers, which Improved Its weather stability and did not affect Its transparency. The formulation of the encapsulation grade ethylene vinyl acetate Is given In Table I. These Ingredients are compounded Into Elvax... 

EVA (Elvax 150, Du Pont) Lupersol 101 (peroxide) Naugard-P (antioxidant) Tlnuvln 770 (UV stabilizer) Cyasorb UV-531 (UV stabilizer)... 

A Gulf Oil ethylene/methyl acrylate rubber of 20 weight % EMA which is not nearly as transparent as Elvax 150 EVA is being... 

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