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。

公开(公告)号：US20040254254A1

公开(公告)日：2004-12-16

申请号：US10855633

申请日：2004-05-28

Applicant: JSP CORPORATION

Inventor： Keiichi Hashimoto ,  Akinobu Hira ,  Hidehiro Sasaki

IPC: C08G11/00 ,  C08J009/22 ,  C08J009/18

CPC classification number: C08J9/0061 ,  C08J9/0066 ,  C08J9/122 ,  C08J9/18 ,  C08J2201/024 ,  C08J2203/06 ,  C08J2323/12 ,  C08J2400/22 ,  C08J2423/00

Abstract: A process for the production of expanded beads, including kneading a base resin containing a polypropylene resin and having a tensile modulus of at least 1,200 MPa together with a mixture of a coloring agent and a thermoplastic polymer having a tensile modulus lower than that of the base resin to form a kneaded mixture including a matrix of the base resin and a multiplicity of domains dispersed in the matrix and each containing the thermoplastic polymer and the coloring agent. The kneaded mixture is formed into resin particles, then treated with an organic peroxide to modify surfaces of the resin particles therewith. Foaming and expanding of the surface-modified resin particles gives expanded beads having an inside region surrounded by a surface region. The heat of fusion of a high temperature peak of the surface region is lower than that of the inside region.

Abstract translation: 一种生产发泡珠粒的方法，包括捏合含有聚丙烯树脂的基础树脂和拉伸模量至少为1200MPa的着色剂和热塑性聚合物的混合物，其拉伸模量低于基体的拉伸模量 树脂以形成包含基体树脂的基体和分散在基体中的多个畴并且各自包含热塑性聚合物和着色剂的捏合混合物。 捏合的混合物形成树脂颗粒，然后用有机过氧化物处理以改性树脂颗粒的表面。 表面改性树脂颗粒的发泡和膨胀产生具有由表面区域包围的内部区域的发泡珠粒。 表面区域的高温峰的熔化热低于内部区域的熔融热。