polyvinylacetaat

Polyvinyl acetate (PVAc) is a synthetic polymer produced from vinyl acetate monomer by free-radical polymerization. The repeating unit is [-CH2-CH(OAc)-]n. In industry PVAc is mainly prepared as water-based emulsions (PVAc latex) that act as binder resins. The polymer can be partially or fully hydrolyzed to form polyvinyl alcohol (PVA), yielding grades with varying degrees of hydrolysis and solubility in water.

PVAc exists as solid resins and as latexes used in coatings and adhesives. The glass transition temperature of PVAc is typically in the low- to mid-30s Celsius, depending on molecular weight and hydrolysis. Film formation occurs when water or solvent evaporates and the dispersed droplets coalesce, producing a continuous PVAc film. PVAc adheres well to paper, wood, textiles, and many substrates, making it popular as a binder and adhesive.

Applications of PVAc include white glues (PVA glues), interior paints and coatings, textile sizing, and packaging and bookbinding adhesives. PVAc emulsions are widely used as water-based binders in coatings and as components in formulated adhesives, often in combination with other binders or additives to tailor properties such as flexibility and tack.

Safety and environmental notes: Vinyl acetate monomer, the precursor to PVAc, is flammable and considered a potential occupational carcinogen by inhalation. PVAc polymers and emulsions themselves are generally regarded as low-to-moderate hazard formulations when used as intended, though residual monomer, additives, and proper handling and ventilation are important considerations.