| 摘要 |
<p>PURPOSE:To deodorize an odoriferous resin effectively without detriment to the properties of the resin, by bringing the odoriferous resin into contact with a deodorant selected from among 3C or lower alkenes or alkanes and carbon dioxide at a temperature higher than the critical temperature of the deodorant and a pressure higher than its critical pressure. CONSTITUTION:An odoriferous resin containing odorants (e.g., ethylene/ethyl acrylate copolymer or ethylene/vinyl acetate copolymer) is brought into contact with a deodorant selected from among 3C or lower alkenes (e.g., ethylene or propylene), 3C or lower alkanes (e.g., methane or ethane) and carbon dioxide at a temperature higher than the critical temperature of the deodorant and a pressure higher than its critical pressure to remove the odorants from the resin. By using a cosolvent selected from among 1-3C alcohols (e.g. methanol), ethers, and ketones, it is possible to enhance an effect of extracting the odorants to thereby reduce the amount of a deodorant used.</p> |
