Reducing absorption/desorption tendency of poly:isocyanate polyaddition products eg poly:urethane(s)

摘要

Use is claimed of 24-34C fatty acids (and/or their amides and/or esters) in the production of polyisocyanate-polyaddition products with reduced tendency to absorb and/or desorb substances, the production comprising reacting (a) a polyisocyanate with (b) an NCO-reactive compound of mol. wt. 500-8,000, (c) optionally also a chain extender and/or crosslinker of mol. wt. below 500, (d) a catalyst and (e) conventional additives etc in presence of the fatty acid and/or derivative.