发明名称 |
Process for producing pre-foamed particles of polyolefin resin |
摘要 |
In a process for producing pre-foamed particles of a polyolefin resin which comprises impregnating a volatile blowing agent into particles of a polyolefin resin while dispersing the resin particles and the blowing agent in a dispersing medium under heat in a closed vessel, opening one end of the vessel and releasing the resin particles and the dispersing medium simultaneously into an atmosphere kept at a lower pressure than the inside pressure of the vessel; the improvement wherein the pressure of the inside of the vessel after opening its one end is maintained at a substantially constant pressure which is at least 0.7 times the vapor pressure f of the blowing agent before opening the end of the vessel.
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申请公布号 |
US4436840(A) |
申请公布日期 |
1984.03.13 |
申请号 |
US19820420874 |
申请日期 |
1982.09.21 |
申请人 |
JAPAN STYRENE PAPER CORPORATION |
发明人 |
AKIYAMA, HIROYUKI;SHIMADA, SUMIO;HIROSAWA, KUNINORI;KUWABARA, HIDEKI |
分类号 |
B29C67/00;B29B9/16;B29C44/00;B29C59/00;B29K23/00;B29K105/04;C08J9/16;C08J9/18;C08J9/22;(IPC1-7):C08J9/22;B29D27/00 |
主分类号 |
B29C67/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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