申请人:MATSUMOTO YUSHI-SEIYAKU CO., LTD.
公开号:EP1952881A1
公开(公告)日:2008-08-06
The heat-expandable microspheres comprise a shell of thermoplastic resin and a blowing agent encapsulated therein having a boiling point not higher than the softening point of the thermoplastic resin, have a maximum expanding ratio not lower than 50 times, and are thermally expanded into hollow particulates having a repeated-compression durability not lower than 75 percent. The method of producing the heat-expandable microspheres comprises the steps of dispersing an oily mixture containing a polymerizable component and the blowing agent in an aqueous dispersing medium containing a specific water-soluble compound and polymerizing the polymerizable component contained in the oily mixture.
热膨胀微球由热塑性树脂外壳和封装在其中的发泡剂组成,发泡剂的沸点不高于热塑性树脂的软化点,最大膨胀比不低于 50 倍,经热膨胀成空心颗粒,重复压缩耐久性不低于 75%。生产热膨胀微球的方法包括以下步骤:在含有特定水溶性化合物的水性分散介质中分散含有可聚合组分和发泡剂的油性混合物,并聚合油性混合物中所含的可聚合组分。