A method for the preparation of urethane - or urethane - and rigid foams containing isocyanurate groups according to the polyisocyanate polyaddition process of - and in this case for suitable polyoxyalkylene - polyols

摘要

items of the invention are a process for the production of urethane or urethane and isocyanuratgruppen containing hartschaumstoffen through implementation of $(a) polyoxypropylene polyoxyethylene - polyoxypropylene polyols or with secondary hydroxyl groups, a functionality of 3.5 to 4. 3, a hydroxylzahl from 350 to 650 and a viscosity of 500 to 5000 mpa-s at 23u00b0c,$a which are produced by anionic polymerization of ethylene oxide and propylene oxide, or 1.2 - 1.2 - propylene oxide to a startermoleku00fclmischung, which, as a percentage of the total weight, contains (a1) a $40 to 80 wt.% hexantetrole, $a (a) 1 to 30 wt.% hexantriole, $a, a3) from 0 to 35% w / w glycerol. nd $a a4) from 0 to 15% by weight.-% sorbitol or mannitol or mixtures thereof, $a and $b) where low molecular weight kettenverlu00e4ngerungs and / or vernetzungsmitteln with $a (c) organic, eventually modified polyisocyanaten $a $a (d) in the presence of propellant.$a $a and, if necessary, (e) catalysts $f) tools and / or additives for $a, and the polyoxypropylene polyols usable polyoxyethylene - polyoxypropylene polyols and.