发明名称 |
METHOD FOR THE PREPARATION OF STYRENE POLYMER FOAM AND FOAM PREPARED THEREBY |
摘要 |
Styrene polymer foam that is more environmentally acceptable, capable of making foam insulation over a wide range of densities, decorative and does not require the modification of existing equipment for high pressure operation is prepared using a mixed blowing agent of carbon dioxide plus ethyl chloride and optionally a fluorocarbon to provide a foam having primary cells and secondary cells defined by the struts and walls. The method of preparation involves heat-plastifying the styrene polymer and adding to the heat-plastified polymer a mixed blowing agent of carbon dioxide, ethyl chloride and optionally a fluorocarbon under a pressure sufficiently high to prevent foaming; reducing the temperature of the mixture and reducing the pressure of the mixture as it is extruded to form the foamed product. |
申请公布号 |
WO8606084(A1) |
申请公布日期 |
1986.10.23 |
申请号 |
WO1986US00589 |
申请日期 |
1986.03.26 |
申请人 |
THE DOW CHEMICAL COMPANY |
发明人 |
SUH, KYUNG, W.;KENNEDY, JOHN, M. |
分类号 |
B29C47/00;B29K25/00;B29K105/04;C08J9/12;(IPC1-7):C08J9/14;C08J9/30;B29C67/22 |
主分类号 |
B29C47/00 |
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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