VERFAHREN ZUR HERSTELLUNG VON URETHAN- ODER URETHAN- UND ISOCYANURATGRUPPEN ENTHALTENDEN HARTSCHAUMSTOFFEN UND TREIBMITTEL ENTHALTENDE EMULSIONEN HIERFUER

摘要

The invention relates to a process for the preparation of rigid foams containing urethane groups or urethane and isocyanurate groups, 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 and optionally ���f) assistants and/or additives, � where the blowing agent (d) used is at least one vinylfluoroalkane of the formula CH2=CH-CnF2n+1 in which n is an integer from 1 to 6 (di), or mixtures of at least one such vinylfluoroalkane (di) and at least one further physical and/or chemical blowing agent (dii) which is different from (di), and to blowing agent-containing emulsions which contain at least one vinylfluoroalkane and at least one formative component (a), (b), (c) or (b) and (c).