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The weight percent of vinyl acetate usually varies from 10 to 50%, 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 EVA copolymer which is based on a low proportion of VA (approximately up to 4%) may be referred to as vinyl ...
Vinyl acetate is the acetate ester of vinyl alcohol. Since vinyl alcohol is highly unstable (with respect to acetaldehyde), the preparation of vinyl acetate is more complex than the synthesis of other acetate esters. The major industrial route involves the reaction of ethylene and acetic acid with oxygen in the presence of a palladium catalyst. [6]
Polyvinyl acetate was discovered in Germany in 1912 by Fritz Klatte. [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.
Acrylic elastomer can generally be characterized as one of two types. "Old" types include ACM (copolymer of acrylic acid ester and 2-chloroethyl vinyl ether) containing chlorine and ANM (copolymer of acrylic acid ester and acrylonitrile) without chloride. "New" types do not contain chlorine and are less prone to mold-related staining.
An environmental coalition recently discovered chemicals called phthalates in vinyl gloves used at certain McDonald's, Burger King, and Wendy's locations.. Phthalates are part of the plasticizer ...
If unsaturated esters are copolymerized with ethylene, either the alcohol moiety may be in the polymer backbone (as it is the case in ethylene-vinyl acetate copolymer) or of the acid moiety (e. g. in ethylene-ethyl acrylate copolymer). Ethylene-vinyl acetate copolymers are prepared similarly to LD-PE by high pressure polymerization. The ...
Fenceline monitoring for six toxic air pollutants — ethylene oxide, chloroprene, vinyl chloride, benzene, 1,3-butadiene and ethylene dichloride — will be crucial to ensure accountability and ...
The auricular splint (AS) is easy to fit and remove, self-retaining, lightweight and easy to camouflage due to its transparency. The AS is made from ethylene-vinyl acetate (EVA), which is inert and non-toxic, non-absorbent, sufficiently elastic to allow it to fitted and removed but sufficiently rigid to avoid breakage.