Polychloroprene lattices have not widely replaced solvent based contact cements as originally thought. It takes a waterborne adhesive much longer to dry, and if force dried the energy used is an added cost. The autohesion properties of water based polychloroprene adhesives provide lower initial strength and make bonding at low pressures difficult. Also the heat and moisture resistance of these adhesive is generally lower than their solvent based counterparts because of the presence of surface active ingredients. However, significant development work has occurred over the last several years to minimize these problems.
RESULTING PROPERTIES
A starting formulation for two polychloroprene emulsion contact adhesives and their resulting adhesive properties are given in the table above. The data also shows the effect of different resins on peel adhesion at room and elevated temperatures.
