LANXESS: A NEW PREPOLYMER FOR CAST ELASTOMERS WITH UNUSUAL PROPERTIES - HIGH TEAR RESISTANCE AND LOW COMPRESSION SET

摘要

A new MDI-terminated prepolymer based on a polyester has been developed. It cures with 1,4-butanediol to give polyurethane hot-cast elastomers. These are characterized by high tear resistance and low compression set at the same time. Under catalysis, the prepolymer can be economically processed in short to medium pot life. This enables the production of elastomer solutions with hardnesses of 83 - 87 Shore A, covering a wide range of requirements. The post-curing of the resulting components can be delayed without any loss of mechanical properties.