| 摘要 |
This invention relates to a process for making polyurethane elastomer moldings from A. ORGANIC POLYISOCYANATES B. POLYHYDROXYL COMPOUNDS HAVING MOLECULAR WEIGHTS IN THE RANGE FROM ABOUT 1800 TO ABOUT 10,000, C. A CHAIN EXTENDER, D. A BLOWING AGENT AND E. OPTIONALLY THE AUXILIARIES AND ADDITIVES COMMONLY USED IN MAKING POLYURETHANES, THE IMPROVEMENT WHEREIN SAID CHAIN EXTENDER (C) IS A POLYOL MIXTURE COMPRISING I. ETHYLENE GLYCOL AND II. AT LEAST ONE OTHER POLYOL HAVING A MOLECULAR WEIGHT BELOW 1800 AND WHEREIN SAID POLYOL MIXTURE HAS AN AVERAGE MOLECULAR WEIGHT BELOW ABOUT 600. |
