| 摘要 |
This invention relates to a process for making elastomeric polyurethane reaction injection moldings from (a) organic polyisocyanates (b) polyhydroxyl compounds having molecular weights in the range from about 1,800 to about 10,000, (c) a chain extender, (d) a catalyst (e) a blowing agent and, (f) optionally the auxiliaries and additives commonly used in making polyurethanes, where the catalyst used is a dialkyl tin dithiocarboxylate and the chain extender comprises at least 75% by weight of ethylene glycol based on the total amount of chain extender.
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