Production of chlorofluorocarbon-free, urethane-containing...

Details Production of chlorofluorocarbon-free, urethane-containing... Production of chlorofluorocarbon-free, urethane-containing...

B - Operations, Transporting

29

C

B29C 44/06 (2006.01) C08G 18/12 (2006.01) C08J 9/34 (2006.01) C08K 3/04 (2006.01)

Patent

CA 2083647

A process for the production of chlorofluorocarbon-free, urethane- or urethane- and urea-containing, soft-elastic, semirigid or rigid moldings having a cellular core and a compacted peripheral zone and an essentially pore-free, smooth surface involves reacting a) an organic and/or modified organic polyisocyanate with b) at least one relatively high-molecular-weight compound containing at least two reactive hydrogen atoms, and, if desired, c) a low-molecular-weight chain extender and/or cross- linking agent, in the presence of d) a blowing agent, e) a catalyst, f) at least one microporous activated charcoal and/or microporous carbon molecular sieve which preferably has a mean pore diameter with a frequency of occur- rence of 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, and, if desired, further additives and g) assistants, in a closed mold with compaction.

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