Fremgangsmåde til fremstilling af fluorchlorcarbonhydridfrie, urethangruppeholdige formlegemer med en kerne af celler og en komprimeret randzone
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...
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Main Authors | , , , , , |
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Format | Patent |
Language | Danish |
Published |
18.11.1996
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Edition | 6 |
Subjects | |
Online Access | Get full text |
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Summary: | 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 m /g or greater, and optionally further additives and
g) auxiliaries,
in a closed mould with compaction. |
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Bibliography: | Application Number: DK19920119790T |