Typical Formulation Ingredients
Ingredient
Parts by weight
Polyester polyol (Desmophen 1200, Bayer)
Polyester polyol (Desmophen 1700, Bayer)
Vinyl emulsion (Mowilite 30, Hoechst Celanese) 20% in solvent mix*
Aromatic polyisocyanate (Desmodur L75, Bayer)
Resulting Properties
Contact adhesives are widely used because of their easy application, fast setting properties, and excellent adhesion to many different substrates. The contact adhesive is coated on both surfaces to be joined. After the carrier evaporates, the two surfaces are brought together under slight pressure, and the adhesive bonds to itself. Polyurethane contact adhesives can be applied similarly to polychloroprene contact adhesives. A typical formulation for a solvent borne polyurethane contact adhesive is provided in the above table.