EMBEDDED MATERIAL OF POLYURETHANE

摘要

A process for the preparation of a polyurethane which comprises reacting an excess of an aromatic diisocyanate with a mixture of castor oil and trimethylol propane to obtain an NCO group-containing pre-adduct and cross-linking the pre-adduct using a castor oil or a mixture of castor oil and trimethylol propane. The present invention further relates to a polyurethane obtainable by such a process. An embedding process which comprises embedding a material to be embedded in such a polyurethane and hardening the polyurethane is also disclosed as is a material when embedded by such a process or an apparatus comprising such a material.