| abstract |
The present invention relates to a method for producing pore-free polyurethane molded parts having a Shore D hardness in accordance with DIN 53505 of 60 or above, by mixing (a) polyester diol having an OH number of 20 to 100 mg KOH/g and (b) chain extenders consisting of diol having a molecular weight of less than 300 g/mol with (c) isocyanate prepolymers, obtainable by reacting diisocyante with polyesterols having a functionality of 1.95 to 2.2 and an OH number of 20 to 200 mg KOH/g, and optionally (d) catalysts, (e) emulsifier and (f) other additives to a reaction mixture, applying said reaction mixture into a mold and hardening to a polyurethane elastomer. The present invention further relates to polyurethane elastomer molded parts obtainable by such method and the use of said polyurethane molded parts as trim part for utility vehicles, vehicle body components in vehicle construction or as a trim for a machine system. |