Polyurethane for use e.g. in shoe sole production, based on a prepolymer obtained by reacting polyisocyanate with an alkoxylated diol and a polyether-ol obtained by alkoxylating a triol

摘要

Polyurethane foam derived from (a) an isocyanate prepolymer, (b) a polyether-ol and other components, in which (a) is obtained by reacting a polyisocyanate with a polyether-ol (OH number 15-250) obtained by alkoxylating a diol starter compound, and (b) is obtained by alkoxylating a triol starter compound. Polyurethane (PUR) containing the reaction mixture of (a) a polyisocyanate prepolymer with an NCO content of 8-25% with (b) a polyether-ol with an OH number of 20-200 and optionally (c) chain extenders, in presence of (d) water as blowing agent, (e) catalysts and optionally (f) additives. The prepolymer (a) is obtained by reacting a polyisocyanate (a1) with a polyether-ol component (a2) with an OH number of 15-250 which is obtained by alkoxylating a diol starter compound; polyether-ol (b) is obtained by alkoxylating a triol starter compound. An independent claim is also included for a method for the production of PUR by reacting components (a)-(f) together as above.