Polyvinyl alcohol additive-free

Water-based dispersions or emulsions such as polyvinyl acetate, acrylics, polyvinyl chloride and polyvinyl alcohol with plasticizers and tackifiers. In addition, this range can include urea formaldehyde and phenolic adhesives, resins, natural adhesives produced from starch, dextrin, casein, animal glues (see Polyvinyl alcohol in adhesives, Phenolic adhesives single-stage resoles. Phenolic adhesives two-stage novolacs. Animal glues and technical gelatins) and rubber latex (see Emulsion and dispersion adhesives). Solvent-free 100% solids such as polyurethane. Hot melt adhesives include Ethylene-vinyl acetate copolymers, polyolefins, polyamides, polyesters with tackifiers and waxes. More recent additions include cross-linkable systems. 

In 2009, an estimated four billion metric tons of natural, semisynthetic, and synthetic water-soluble polymers were consumed globally for use in the production of food, clean water, energy, for personal care, pharmaceutical, and industrial applications [1], Synthetic water-soluble polymers synthesized by free radical addition polymerization methods account for half of this volume. They include polyacrylamides, polyacrylates, polydiaUyldimethylammonium chloride (polyDAD-MAC), polyvinyl alcohol, and polyvinylpyrrolidones. Depending on the target applications, these polymers can have different molecular weight, charge, and architecture. 

Carboxylic acids often have been identified by means of paper chromatography Clarke and Bazill (10) have extracted plasticizers from polyvinyl chloride first with ether and then with methanol. Subsequently the extracts were saponified with alcoholic potassium hydroxide, and the precipitated potassium salts were isolated and converted into free acids. These, in alcoholic solution, were then applied to paper and chromatographed ascendingly with a mixture of butanol, pyridine, water, and ammonia the migration period was about six hours. A number of additional color tests facilitated identification of unknown acids. 

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