Expandable styrene resin particles, expandable bea

专利名称：Expandable styrene resin particles,

expandable beads, and foamed article

发明人：Makoto Kunimi,Tetsuya Katou,Makoto

Saitou,Hiroshi Nakaguki,Toshio Akima

申请号：US10901970申请日：20040730

公开号：US20050004241A1公开日：20050106

摘要：A process of producing expandable styrene resin particles, wherein insuspension polymerization of styrene monomers, the concentration of oxygen in areaction vessel is kept low at least in a late stage of the polymerization, and the resultingstyrene resin particles are impregnated with an expanding agent before or after

completion of the polymerization. Preferably, at a polymerization rate of 60% or higher,the concentration of oxygen in the reaction vessel is kept at 7 volt % or lower. Whenadditional styrene monomers are added during the polymerization, they are added andadsorbed to styrene resin particles in the course of polymerization while the

concentration of oxygen is kept low. By this method, the particles whose internal portionhas a low molecular weight and surface portion has a high molecular weight are obtained.A foamed article produced from the particles has high strength and a good appearance.

申请人：Makoto Kunimi,Tetsuya Katou,Makoto Saitou,Hiroshi Nakaguki,Toshio Akima

地址：Ichihara-shi JP,Ichihara-shi JP,Ichihara-shi JP,Ichihara-shi JP,Ichihara-shi JP

国籍：JP,JP,JP,JP,JP

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