| 摘要 |
Bis-hydroxyalkyl esters of benzene dicarboxilic acids are produced by suspending 1 mole of the acid in nitrobenzene or a nitrobenzene/nitrotoluene mixture and reacting at 80 deg.-200 deg.C (especially 100 deg.-150 deg.C), with 1.7 to 5 moles, (especially 2 to 4 moles), of alkylene oxide in the presence of a soluble catalyst such as an amine, arsine, stibine, phosphine or quaternary ammonium compound. The reaction is stopped when 75 to 98% of the acid has reacted; time required is 10 to 180 minutes. Similar processes exist using different dispersion media. These new media give conversions and the products have a low dialkylene glycol contamination. Polymer prepared from the ester is suitable for tyre cord. The solubility of the ester in the media is high acid concentrations may be used and still give a yield which is entirely soluble. The acid is completely insoluble and separation is easy. |
