| abstract |
The present invention relates to a process for the preparation of rock packs and preferably cellular (cellular) polyethane retainers a) 800-6000 molecular weight polyhydroxy compounds and optionally b) up to 800 molecular weight chain strength and / or crosslinking agents, at least one diisylene ethylene diisocyanate, diphenylmethane diisocyanate, 3,3'-dimethyldiphenyl diisocyanate, 1,2-diphenylethane diisocyanate or phenylene diisocyanate base / or C12-C12 aliphatic diisocyanate and / or C 6-18 carbonate by reacting, in which case the building blocks (a), (c) and in the additive (b) are preferably reacted by a) a prepolymer, d) catalysts in the presence of e) blowing agents and f) additives. The invention further relates to isocyanate prepolymers. ŕ |