| 摘要 |
This invention relates to a process for the production of a polyurethane molded part from a reaction injection molding process. The reaction mixture comprises: A) an isocyanate distillation residue resulting from the production of 1,6-hexamethylenediisocyanate by phosgenation of the corresponding amine, followed by the distillation of the pure 1,6-hexamethylenediisocyanate to yield said residue, wherein said residue has an NCO content of from 20 to 27%, a viscosity of from 1500 to 5000 cps at 25 DEG C., and from 0.1 to 3% by weight of hydrolyzable chlorides; with B) an isocyanate-reactive component comprising at least one organic compound having a molecular weight of from 500 to 10,000 and containing at least two isocyanate-reactive hydroxyl groups, and at least one organic diol having a molecular weight of from about 62 to 500, in the presence of C) a specific catalyst mixture. The catalyst comprises at least one tertiary amine catalyst in combination with another catalyst selected from the group consisting of metal carboxylates, metal halides, ammonium carboxylates, and mixtures thereof.
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