Process for the preparation of polyols

摘要

The present invention provides polyols which can be obtained by a simple process. These polyols, unless explicitly specified, are to be understood to encompass both polyether polyols and polyether ester polyols. The invention further provides the simple process for the production of the polyols, and also, the production of polyurethanes comprising reacting a polyol according to the invention with a polyisocyanate.

主权项

1. A process for the preparation of polyols comprising
(1) base-catalysed addition of
(a) one or more alkylene oxides, wherein the proportion of ethylene oxide in the alkylene oxides is at least 10 weight %, based on 100 weight % of the alkylene oxides,to(b) one or more polyfunctional starter compounds having Zerewitinoff-active hydrogen atoms,in the presence of(c) one or more catalysts selected from the group consisting of alkali metal hydroxides, alkali metal hydrides, alkaline earth metal hydrides, alkali metal carboxylates, alkaline earth metal carboxylates and alkaline earth hydroxides, in which the concentrations of said catalysts, based on the amount of end product, is from 0.004 to 0.5 weight %, (2) neutralizing the alkaline polymerisation-active centers of the crude alkylene oxide addition product by adding sulfuric acid in such a manner that, of from 66 mol % to 100 mol % of the acid used, only the first dissociation stage of sulfuric acid is effective for neutralization of the amount of catalyst contained in the crude polymer, wherein the resultant polyols are not filtered.