| 摘要 |
Chlorofluorocarbon-free, urethane-containing moldings having a cellular core and an integral skin with an essentially pore-free surface, ie. polyurethane (PU) integral foams, are produced by reacting the conventional starting components in the presence of blowing agents, catalysts and at least one additive selected from the group consisting of the partially or completely neutralized (1) homopolymers of monoethylenically unsaturated monocarboxylic acids, dicarboxylic acids or the internal anhydrides thereof, (2) copolymers of (2i) monoethylenically unsaturated monocarboxylic acids, di carboxylic acids or the internal anhydrides thereof and (2ii) carboxyl-free, monoethylenically unsaturated monomers copolymerizable with (2i) and (3) copolymers or graft copolymers of (3i) monoethylenically unsaturated monocarboxylic acids and/ or their salts, (3ii) monoethylenically unsaturated dicarboxylic acids, their salts and/or their internal anhydrides and (3iii)if required, carboxyl-free, monoethylenically unsatu rated monomers copolymerizable with (3i) and (3ii) in a closed mold with compaction.
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