23.
    发明专利
    未知

    公开(公告)号:DE4333795C2

    公开(公告)日:2003-04-10

    申请号:DE4333795

    申请日:1993-10-04

    Applicant: BASF AG

    Abstract: The invention relates to a process for the production of thermoplastically mouldable rigid polyurethane foams by reacting a) organic polyisocyanates with b) a mixture of polyhydroxyl compounds containing, based on the total weight: b1) from 40 to 60 % by weight of a trifunctional polyoxyalkylene-polyol having a hydroxyl number of from 350 to 500, b2) from 15 to 30 % by weight of a difunctional polyoxyalkylene-polyol having a hydroxyl number of from 200 to 350, b3) from 5 to 20 % by weight of a difunctional or trifunctional polyoxyalkylene-polyol having a hydroxyl number of from 25 to 40, and b4) from 15 to 30 % by weight of a dialkylene glycol, in the presence of c) blowing agents, d) catalysts, e) auxiliaries and/or additives, and to the mixtures of relatively high-molecular-weight polyhydroxyl compounds which can be used for this purpose.

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