| abstract |
This invention relates to a process for the preparation of non-cellular or cellular polyurethane elastomers by the reaction of (a) an organic polyisocyanate, preferably in the form of NCO groups containing prepolymers and/or modified urethane group containing organic polyisocyanates with (b) a higher molecular weight compound having at least two reactive hydrogen atoms, (c) a polyester polyol containing tin and/or titanium compounds as catalysts, and optionally (d) a chain extending agent and/or crosslinking agent in the presence of (e) blowing agents, (f) auxiliaries and/or additives whereby from 0.1 to 10 parts by weight, based on 100 parts by weight of the (b) component, of a polyester polyol is used as a catalyst, which is prepared by the polycondensation of organic polycarboxylic acid with multivalent alcohols in the presence of from 0.002 to 5 weight percent, based on the weight of the polycondensation mixture, of a titanium and/or tin compound used as a catalyst at temperatures from 150 DEG to 200 DEG C., as well as using this catalyst in the preparation of plastics using the polyisocyanate addition polymerization process, preferably for preparing polyurethane-plastics. |