申请人:Covestro LLC
公开号:US20170158801A1
公开(公告)日:2017-06-08
Rigid polyurethane foams are made by reacting an organic polyisocyanate with an isocyanate-reactive composition which includes a polyol, a blowing agent blend of hydrofluorocarbons, a urethane-forming catalyst, a polyether-modified polysiloxane, and water. The blowing agent blend includes a C
4
polyfluorohydrocarbon and a C
3
polyfluorohydrocarbon. The rigid polyurethane foams exhibit improved adhesion to facer substrates and excellent thermal conductivity, compressive strength, and dimensional stability.