Process for the preparation of a rigid polyurethane foam

摘要

Process for the preparation of a rigid polyurethane foam by reacting a suitable polyisocyanate with a polyol component comprising from 1 to 45 wt % of recycled polyol in the presence of water and a suitable urethane catalyst and optionally usual auxiliaries, characterised in that the urethane catalyst comprises benzyl dimethylamine in an amount of from 1 to 10 parts by weight per 100 parts by weight of polyol component.