公开(公告)号：US20030034580A1

公开(公告)日：2003-02-20

申请号：US10163366

申请日：2002-06-07

Applicant: JSP CORPORATION

Inventor： Hidehiro Sasaki ,  Kazuya Ogiyama ,  Akinobu Hira ,  Keiichi Hashimoto ,  Hiroki Yanagisawa ,  Hisao Tokoro

IPC: B29C044/02

CPC classification number: C08J9/18 ,  B29C44/445 ,  C08J2203/06 ,  C08J2323/12

Abstract: A method for producing expanded polypropylene resin particles wherein polypropylene resin particles impregnated with a physical blowing agent are heated along with an aqueous medium and a dispersant and are released and expanded at reduced pressure from the interior of a pressure-tight vessel, wherein the aforementioned aqueous medium has an electrical conductivity of from not less than 0.00 ms/m to not more than 20.00 mS/m. The resulting particles obtained are without inconsistencies caused by differences in the amount of dispersant adhering to the particles or the amount of dispersant added to prevent the particles from fusing together during the heat treatment step of the method.

Abstract translation: 一种生产发泡聚丙烯树脂颗粒的方法，其中浸渍有物理发泡剂的聚丙烯树脂颗粒与水性介质和分散剂一起加热，并在减压下从压力容器的内部释放和膨胀，其中上述水溶液 介质的导电率不小于0.00ms / m到不大于20.00mS / m。 获得的所得颗粒没有由附着于颗粒的分散剂的分散量的不均匀性或加入的分散剂的量而引起的不一致，以防止在该方法的热处理步骤期间颗粒熔合在一起。