| 发明名称 | Pre-expanded particles, process for producing the same, and expanded molded article | ||
| 摘要 | A process for producing pre-expanded particles, comprising the steps of: impregnating 100 parts by weight of polystyrene type resin particles with a volatile blowing agent in the presence of 0.1 to 2.0 parts by weight of a first antistatic agent to obtain expandable resin particles; andbringing 100 parts by weight of the expandable resin particles into contact with 0.1 to 2.0 parts by weight of a second antistatic agent in the presence of an antifoaming agent, and then pre-expanding the particles, thereby obtaining pre-expanded particles, whereinthe second antistatic agent and the antifoaming agent are used in a ratio by weight of 1:0.04 to 1.50. | ||
| 申请公布号 | US8796344(B2) | 申请公布日期 | 2014.08.05 |
| 申请号 | US200913140231 | 申请日期 | 2009.12.25 |
| 申请人 | Sekisui Plastics Co., Ltd. | 发明人 | Gondo Yuichi;Matsumura Hideyasu |
| 分类号 | C08J9/16;C08J9/22;C08J9/18 | 主分类号 | C08J9/16 |
| 代理机构 | Greenblum & Bernstein, P.L.C. | 代理人 | Greenblum & Bernstein, P.L.C. |
| 主权项 | 1. A process for producing pre-expanded particles, comprising: impregnating 100 parts by weight of polystyrene type resin particles with a volatile blowing agent in the presence of 0.1 to 2.0 parts by weight of a first antistatic agent to obtain expandable resin particles; and bringing 100 parts by weight of the expandable resin particles into contact with 0.1 to 2.0 parts by weight of a second antistatic agent in the presence of an antifoaming agent, and then pre-expanding the particles, thereby obtaining pre-expanded particles, wherein the second antistatic agent and the antifoaming agent are used in a ratio by weight of 1:0.04 to 1.50, the first antistatic agent comprises a nonionic surfactant, the second antistatic agent comprises a cationic surfactant, and the antifoaming agent comprises a polyoxyalkylene glycol or polyoxyalkylene alkylether, and has a hydrophilic-lipophilic balance (HLB) value of 9 or less. | ||
| 地址 | Osaka JP | ||