| 摘要 |
A method for the production of semi-rigid polyurethane foam (I) by reacting (a) isocyanates with (b) isocyanate-reactive compounds in presence of (d) blowing agents and optionally (c) catalysts and/or (e) additives involves carrying out the reaction in presence of polyester(s) as component (b) or (e) and using isocyanate (a) containing polymeric MDI. Independent claims are also included for (1) (1) polyurethane foam (I) obtained by this method (2) (2) polyurethane foam (I) containing polyester and polymeric MDI in which, after 7 days at 140degreesC, the tensile strength, elongation at break and crushing strength are each reduced by not more than 40% and in which, after humidity/heat ageing (DIN 53578; 3 cycles of 5 hours at 120degreesC) the corresponding reductions are not more than 40%, not more than 10% and not more than 50% (based on untested foam) (3) (3) back-foaming of instrument panels, door side panelling, arm rests, flange edges, central consoles, airbag covers and glove box covers with (I) .
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