| 摘要 |
PRODUCTION OF POLYURETHANE MOLDINGS BY THE REACTION INJECTION MOLDING PROCESS The present invention is directed to a process for the production of polyurethane moldings by reacting a reaction mixture comprising a) an organic polyisocyanate b) a compatible polyol blend comprising (i) at least one polyether polyol having an hydroxyl functionality of from 2 to 8, and a molecular weight of from 350 to below 1800, and (ii) at least one hydroxyl functional organic material containing from 2 to 8 hydroxyl groups and having a molecular weight below 350, components i) and ii) being used in a weight ratio of component b)i) to b)ii) of from about 10:1 to about 1:10, and (iii) no more than 45% by weight based on the weight of component b) of an active hydrogen containing compound having a molecular weight of 1800 or more, said reaction mixture being processed as a one-shot system by the RIM process at an isocyanate index of from about 70 to about 130. |
