Airflex 920 carboxylated vinyl acetate-ethylene (VAE) copolymer Air Products Ethylene copolymers - emulsions (VAE, EVC) >> Vinyl Acetate Ethylene copolymers, VAE ADHESIVE >> Hot-melt >> Pressure sensitive (HMPSA) Airflex 920 emulsion is a -20 °C Tg carboxylated vinyl acetate-ethylene (VAE) copolymer emulsion that offers excellent flow, wetout and adhesion to a wide variety of polymeric-based films, overprint coatings and other difficult-to-adhere substrates for use in adhesive formulations. The polymer emulsion combines high ethylene content and carboxyl functionality through a unique polymerization process to exhibit adhesion properties that are an improvement over conventional, plasticized VAE copolymer emulsions. The carboxyl functionality also allows the copolymer film to be crosslinked and provides a means for the emulsion to be thickened through the addition of alkalis. Airflex 920 emulsion is poly(vinyl alcohol) stabilized for high wet tack, good setting speed and machinability. Its excellent film coalescence also offers improved film clarity, water resistance and initial green strength over conventional VAEs. The polymer emulsion also exhibits greater flexibility, adhesion and residual tack than conventional VAEs because of its lower glass transition temperature. Airflex 920 emulsion has a total volatiles content of less than 1,000 ppm. Compounding Airflex 920 emulsion is extremely versatile because it is compatible with many other raw materials and polymer systems including Vinac® homopolymer, Flexbond® copolymer and Airflex copolymer emulsions. The viscosity and rheology can be modified with additives such as poly(vinyl alcohol), cellulosic thickeners, starch and alginates, inverse polyacrylate emulsions, or associative thickeners. Airflex 920 emulsion can also be thickened through the addition of specific sulfonated alkyl ester-based wetting agents. Although plasticizers will further lower the Tg of the Airflex 920 emulsion film, they do not yield the same high viscosity thickening response associated with our Airflex 400 and 300 emulsions. The adhesive emulsion does accept high loadings of dry fillers and wets them well. Extremely high levels of fillers require that they be predispersed. The addition of standard bases or other alkalis will neutralize the carboxyl groups present in the polymer backbone, swell the particles, and produce an increase in the emulsion viscosity. Applications: The excellent adhesion and wet properties of Airflex 920 emulsion suggest its suitability for a host of specialty packaging and converting applications including film to board/paper laminating, film to film, window film, bottle labeling, and folding carton manufacturing. The properties of the emulsion also lend themselves as an adhesion promoter and modifier in many other adhesive formulations where flow, wetout and specific adhesion are critical. The semi-pressuresensitive nature of the copolymer film is beneficial in enhancing the shear properties of other pressure-sensitive adhesives. Carboxylated, low Tg vinyl acetate-ethylene (VAE) copolymer emulsion. Offers excellent flow, wetout and adhesion to a wide variety of polymeric-based films, overprint coatings and other difficult-to-adhere substrates for use in adhesive formulations. Poly(vinyl alcohol) stabilized for high wet tack, good setting speed and machinability. Good film coalescence, film clarity, water resistance and initial green strength. Great flexibility, adhesion and residual tack.