Process for the production of flexible, elastic mouldings containing urethane groups, having a compacted peripheral zone and a cellular core and having improved demoulding properties, and internal mould release agents suitable for this process

摘要

The invention relates to a process for the production of flexible, elastic mouldings containing urethane groups having a compacted peripheral zone and a cellular core 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 polyhydric alcohols and/or low-molecular-weight polyoxyalkylene-polyols, in the presence of d) an internal mould release agent comprising A) from 0.1 to 12% by weight, based on the total weight of (b) or (b) and (c), of a mixture comprising i) from 60 to 90 parts by weight of at least one organic amine, ii) from 10 to 40 parts by weight of at least one ketimine and iii) from 20 to 95 parts by weight of at least one metal salt of stearic acid, and B) from 0.01 to 32% by weight, based on the total weight of (b) or (b) and (c), of at least one organic mono- and/or dicarboxylic acid or carboxylic anhydride thereof, and e) catalysts, f) blowing agents, and optionally g) auxiliaries and/or additives, in a closed mould with compaction, and to the internal mould release agents which are suitable for this purpose.