VERFAHREN ZUR HERSTELLUNG VON POLYURETHAN-HARTSCHAUMSTOFFEN.

摘要

Prodn. of rigid polyurethane foam (I) involves reacting polyisocyanates (II) with cpds. (III) with at least 2 NCO-active H atoms and mol. wt. 350-4000, in the presence of blowing agents (IV), additives (V) contg. P and opt. catalysts, cpds. with at least two NCO-active H atoms and mol. wt. 32-349, surfactive flame retardants and conventional additives. The novel features are that: a) (II) consist of a mixt. of 5-49 (wt.)% diphenylmethane diisocyanates and 95-52% polyphenyl-polymethylene diisocyantes; b) (IV) is water in an amt. of 2-5, pref. 2.5-4.5 pts./100 pts. (III); and c) (V) are P cpds. free from halogen. Specifically inorganic flame retardants can be added; and also CHF2Cl as (IV).