| 摘要 |
The invention concerns a method for preparing polyorganosiloxanes with high purity ester function (acetoxyalkyl or acetoxyalkenyl), consisting in: hydrosilylation between a hydrogenopolyorganosiloxane oil and alpha-olefin alcohol; esterification of the resulting hydroxy-alkylated or polyorganosiloxane with an acetyl halide; elimination of alpha-olefin derivatives and the halohydric acid formed. The resulting polyorganosiloxanes with ester function (acetoxyalkyl) have global siloxane, alpha-olefin unit and/or alpha-olefin impurities contents corresponding to a number of alpha-olefin groups for 100 g of polyorganosiloxane, with ester function less than 10-3 mol. |
