| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a polyether-based polymer of high quality, and a classification method enhancing classification precision and productivity. <P>SOLUTION: The number of particles having 100 mg or less of mass is 99% or more with respect to total particle number, in this polyether-based polymer pellets of the present invention. The polyether polymer pellets is high in its quality. The high quality of pellets is obtained by classification. Multi-stage classification passing the pellets through a screen having at least one kind of sieve opening at two stages or more is carried out in this classification method of the present invention for obtaining the polyether-based polymer pellets. The screen comprises preferably punching metal, in the classification method. Recycle classification is preferably carried out to reclassify the pellets not having passed through the screen in the final stage in the multi-stage classification, together with the unclassified pellets. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
