| 摘要 |
The invention relates to a process for the preparation of cellular plastics by the polyisocyanate polyaddition process, 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) assistants and/or additives, … where the blowing agents (d) used are … … d1) low-boiling, fluorinated and/or perfluorinated tertiary alkylamines or … mixtures of (d1) and at least one further physical and/or chemical blowing agent (d2) other than (d1), … and to blowing agent-containing emulsions of the abovementioned blowing agents (d1) or the blowing agent mixture of (d1) and (d2) and the formative components (a), (b), (c) or (b) and (c). |
