Process for the production of fluorocarbon-free, ethanol-containing forms with a cellular core and a compact peripheral zone

摘要

The invention relates to a process for the preparation of chlorofluorocarbon-free (CFC-free), elastomeric, semi-rigid or rigid mouldings containing urethane groups or urethane and urea groups and having a cellular core and a compacted peripheral zone with an essentially pore-free, smooth surface, by reacting … …  a) organic and/or modified organic polyisocyanates with …  b) at least one relatively high-molecular-weight compound containing at least two reactive hydrogen atoms and optionally …  c) low-molecular-weight chain extenders and/or crosslinking agents, in the presence of …  d) blowing agents, …  e) catalysts, …  f) at least one microporous activated charcoal and/or a microporous carbon molecular sieve, which preferably has a mean pore diameter with more than 40% in the range from 0.3 to 3 nm, a pore volume of from 0.20 to 1.4 ml/g and a BET surface area of from 500 to 2500 m2/g or greater, and optionally further additives and …  g) auxiliaries, … in a closed mould with compaction.