发明名称 |
Foamable composition and process for making large cell size alkenyl aromatic polymer foam structure with 1,1-difluoroethane |
摘要 |
Disclosed is a process for making extruded, closed-cell alkenyl aromatic polymer foam structure having an average cell size of from about 0.3 to about 3.0 millimeters. The process comprises: a) heating an alkenyl aromatic polymer material having greater than 50 percent by weight alkenyl aromatic monomeric units to form a melt polymer material; b) incorporating into the melt polymer material at an elevated pressure a blowing agent comprising at least 50 percent by weight 1,1-difluoroethane (HFC-152a) based upon the total weight of the blowing agent to form a foamable gel; c) cooling the foamable gel to an optimum foaming temperature prior to extrusion through a die; and d) extruding the foamable gel through a die to form the foam structure. Further disclosed is a foamable gel capable of forming an alkenyl aromatic polymer foam structure having an average cell size of from about 0.3 to about 3.0 millimeters.
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申请公布号 |
US5276063(A) |
申请公布日期 |
1994.01.04 |
申请号 |
US19930073854 |
申请日期 |
1993.06.08 |
申请人 |
THE DOW CHEMICAL COMPANY |
发明人 |
SMITH, ROY E.;GRIFFIN, WARREN H.;KOCSIS, DEBORAH L.;LANTZ, DENNIS R. |
分类号 |
C08J9/14;(IPC1-7):C08J9/14 |
主分类号 |
C08J9/14 |
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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