| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a modified polyphenylene ether type resin foam enabling manufacture of a modified polyphenylene ether type resin foam of a high ratio of open cells and a high foaming rate. <P>SOLUTION: The method comprises feeding a modified polyphenylene ether type resin to an extruder to melt and knead with a foaming agent, extruding the resultant mixture from a circular die attached to the tip of the extruder and foaming in order to manufacture a modified polyphenylene ether type resin foam of a ratio of open cells of ≥70% and a foaming rate of at least 20-fold. A temperature-adjusting passage is formed at the tip part of the outer die of the circular die, and a liquid temperature-adjusting medium is caused to flow through the temperature-adjusting passage so as to adjust the temperature of the land part of the circular die. <P>COPYRIGHT: (C)2007,JPO&INPIT |
