Airflex 400H Air Products Ethylene copolymers - emulsions (VAE, EVC) >> Vinyl Acetate Ethylene copolymers, VAE Airflex 400H emulsion is a 0 °C Tg vinyl acetateethylene copolymer emulsion developed as a versatile high-performance base for adhesives. The emulsion offers a superior balance of adhesive/cohesive properties and depending on how it is compounded, can be used in an extremely wide variety of applications. Airflex 400H emulsion is a higher viscosity version of Airflex 400 emulsion and as a result of its higher starting viscosity, much higher formulation viscosities can be achieved. Incorporating Airflex 400H emulsion into adhesive formulations can also help yield lower overall costs by allowing more dilution water to be used to reach the same end viscosities. The backbone of the polymer itself gives the dried adhesive film both toughness and flexibility that persist even with fluctuations in temperature and humidity. The resistance to creep demonstrated by Airflex 400H emulsion at elevated temperatures is much greater than that exhibited by other similar Tg vinyl acetate-ethylene, vinyl acetate-maleate and vinyl acetate-acrylate copolymers. Its powerful initial adhesive strength is maintained even after aging and resists plasticizer migration. Airflex 400H emulsion offers a rapid setting speed, strong wet tack and good machinability because of its poly(vinyl alcohol) stabilization. It also has a total volatiles content of less than 1,000 ppm. Compounding Airflex 400H emulsion is compatible with other vinyl acetate-based emulsions, including Vinac® homopolymer, Flexbond® copolymer and Airflex copolymer emulsions. It is also compatible with rubber lattices; with poly(vinyl chloride) dispersions; and with an assortment of resins, solvents, plasticizers and other modifiers. Airflex 400H emulsion thickens rapidly to high viscosities with the addition of plasticizers and/or solvents. The viscosity can also be increased with additives such as poly(vinyl alcohol), cellulosic thickeners, starch and alginates. Inverse polyacrylate emulsions or associative thickeners may also be used. The addition of plasticizers to Airflex 400H emulsion will improve its specific adhesion, water resistance and setting speed. Additionally, the adhesive emulsion accepts the addition of dry fillers and wets them well; in many cases they do not even need to be predispersed. Applications: Airflex 400H emulsion forms strong bonds between porous substrates and such films as poly(vinyl chloride) (PVC), poly(vinylidene chloride) (Saran), cellulose acetate, polystyrene, Sarancoated cellophane and acrylic. Airflex 400H emulsion adheres such widely diversified substrates as paper, wood, cotton cloth, nylon cloth, hardboard (Masonite), urethane foam and certain types of coated paperboard — notably SBR-coated board and acrylic-coated board. It even bonds tin plate, stainless steel and galvanized metallic surfaces. (This does not mean, however, that it can be used as a structural adhesive for metals) The excellent adhesion of Airflex 400H emulsion to so many substrates suggests its broad use as a versatile base in adhesives manufactured for such applications as packaging, luggage and handbags, bookbinding, shoes, textiles, upholstery, wall paneling, siding and molding, and furniture construction. Airflex 400H emulsion machines well at high speeds and is suitable for the variety of roll, extruder or spray applications for wet adhesives. It can also be pre-applied and heat reactivated (heat sealed). 0 °C Tg vinyl acetate ethylene copolymer emulsion developed as a high-performance base for adhesives. High viscosity. (polyvinyl alcohol protected emulsion). The dried adhesive film has both toughness and flexibility. Resistance to creep at elevated temperatures. Provides powerful initial adhesive strength, rapid setting speed, strong wet tack and good machinability.