| 摘要 |
<p>The present invention is an improved method for stabilising acetal copolymers by hydrolising the copolymer product in a low energy reaction process wherein undesirable side products are continuously and efficiently removed by melting and extruding the unhydrolysed oxymethylene copolymer into a hydrolysis reaction zone in which the necessary reactants are intimately contacted with the copolymer, preferably by means of flow division and rearrangement mixing technique. Subsequently, the hydrolysed copolymer product is devolatilised to remove the unwanted side products by passing it through a devolatilisation zone preferably having more than one devolatilisation port and a vacuum source from which negative pressure is available for application to the devolatilisation ports so that the undesired products may be effectively removed.</p> |
