Preparing polyurethane hard foams, useful e.g. in engine cover and pipe bowls, and for isolating heated material, comprises reacting polyisocyanate with compound having at least two isocyanate reactive groups in presence of blowing agents

摘要

Preparing polyurethane hard foams (I) with low thermal conductivity, comprises reacting polyisocyanate with at least a compound having at least two isocyanate reactive groups in the presence of blowing agents, where the foam further comprises oxidized graphite. An independent claim is included for polyurethane-hard foam material produced by the process.