Abstract: The present invention provides a process to preparing a polyurethane or polyurethane/urea closed cell foam. This foam, when compared to neoprene foam, exhibits a low water absorption and an additional quality of chlorine content of not greater than 0.5% based on the total weight of the closed cell foam.

Abstract: Chemically blown polyurethane elastomeric closed cell foams which exhibit physical characteristics similar to those of neoprene foams are disclosed. The foams are prepared by blending a diisocyanate or polyisocyanate prepolymer, a polyol, such as a polyether polyol or polyester polyol, an amine catalyst, a chemical blowing agent, and optionally a C2-10 diol such as butanediol, and allowing the compounds to cure to form a polymeric material. The polymer is initially heated to a temperature at or above its softening temperature, but below the temperature at which the blowing agent becomes activated, to soften the polymer. The softened polymer is then heated to a temperature at which the blowing agent is activated. The resulting polymer foam includes closed cells, but has less rigidity than conventional closed cell foams. The foam can be used in various applications, for example, in diving suits and orthotic brace materials.

Abstract: The present invention provides a polymer composition having a low water absorption and a chlorine content of not greater than 0.5% based on the total weight of the polymer composition. A process for preparing a polymer composition is also provided.