LOW-DENSITY POLYURETHANE SHOE SOLES OR SOLE PARTS HAVING HIGH REBOUND RESILIENCE AND A LOW COMPRESSION SET

摘要

The present invention relates to a method for producing polyurethane shoe soles having a molded-part density of 100 to 350 g/L, wherein (a) organic polyisocyanates, (b) polyols, (c) propellants containing water, optionally (d) chain extenders and/or cross-linking agents, (e) catalysts, and (f) other auxiliary agents and/or additives are used, wherein in a first step polyisocyanate (a), polyol (b), and optionally chain extenders and/or cross-linking agents (d) are mixed and reacted at a temperature of 110 DEG C to 180 DEG C to form a prepolymer comprising polyisocyanate groups, and in a second step the resulting isocyanate-terminated prepolymer and possibly remaining polyisocyanate (a) are mixed with possibly remaining polyol (b), propellants containing water (c), possibly remaining chain extenders and/or cross-linking agents (d), optionally present catalysts (e), and other auxiliary agents and/or additives (f), introduced into a mold, and allowed to fully cure to form a polyurethane shoe sole.