| 发明名称 |
PROCESS FOR PRODUCING PRE-FOAMED PARTICLES OF POLYPROPYLENE RESIN |
| 摘要 |
<p>A process for producing pre-foamed particles of a polypropylene resin which comprises expanding original pre-foamed particles of a polypropylene resin, said original pre-foamed particles having the following relation 2<E1/3xn1/2<45 wherein E is the expansion ratio of the original pre-foamed particles, and n is the number of cells per mm2 of the cross section of the original pre-foamed particles, by (1) imparting expanding ability to the original pre-foamed particles and then heating them with a heated gas to the heat distortion temperature of the base resin of the pre-foamed particles or a higher temperature or (2) heating the original pre-foamed particles with steam to the heat distortion temperature of the base resin of the particles or a higher temperature with or without imparting expanding ability thereto, whereby pre-foamed particles having an expansion ratio higher than the original expansion ratio E are obtained.</p> |
| 申请公布号 |
EP0108245(B1) |
申请公布日期 |
1987.12.23 |
| 申请号 |
EP19830109827 |
申请日期 |
1983.09.30 |
| 申请人 |
JAPAN STYRENE PAPER CORPORATION |
发明人 |
KUWABARA, HIDEKI;YOSHIMURA, SHOHEI;YAMAGUCHI, TORU;SUDO, YOSHIMI |
| 分类号 |
B29C44/34;C08J9/228;C08J9/232 |
主分类号 |
B29C44/34 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
