Urethan Rubber from a Polyether Glycol. Factors Influencing Processability

Abstract

Adiprene-B urethan rubber is a high-viscosity thermoplastic elastomer that can be compounded and otherwise processed on conventional rubber manufacturing equipment. There are fundamental differences between Adiprene-B and the more common elastomers in processing which must be taken into consideration. 1. Processing temperatures should be less than 121° C to ensure smooth plastic flow and reduce the rate of scorching. 2. Processing temperature is proportional to Mooney viscosity, and both can be reduced by the use of plasticizers. 3. Moisture increases the rate of scorch, and it should be held to a minimum through all phases of processing. 4. Since stocks containing Adiprene-B increase in viscosity during storage, close scheduling of operations will ensure the maximum processable life.