| 摘要 |
<p>This invention relates to non-polymeric, asymmetrical, low freezing, high boiling, aliphatic compounds containing from 2 to 5 pyrrolidonyl rings and from 13 to 40 carbon atoms which melt below 0 °C and which boil above 300 °C at atmospheric pressure and to the synthesis and use of said liquid polypyrrolidonyl compounds.</p> |
