发明名称 |
Verwendung von Nukleierungstreibmitteln bei der Herstellung von isolierenden alkenyl-aromatischen Polymerschaumstoffen |
摘要 |
<p>Alkenyl aromatic thermoplastic synthetic resinous elongate foam bodies having a machine direction, a traverse direction and closed noninterconnecting gas-containing cells are prepared using at least 70 percent by weight of 1,1,1-trifluoroethane and or 1,1,1,2-tetrafluoroethane as a blowing agent or part of a blowing agent mixture. These foam bodies have an average cell size of 0.01 to 0.3 millimeters, a density of from 0.75 to 6.0 pounds per cubic foot, an absolute dimensional stability of less than 4 percent in any direction when measured by the test designated ASTM D2126/C578, and preferably a minimum cross-sectional dimension of at least 0.25 inch, a cross-sectional area of at least 8 square inches, a water vapor permeability not greater than 1.8 perm inches. A cell size enlarger agent may be necessary for cell sizes in the 0.2-0.3 range.</p> |
申请公布号 |
DE69031066(D1) |
申请公布日期 |
1997.08.21 |
申请号 |
DE1990631066 |
申请日期 |
1990.11.07 |
申请人 |
THE DOW CHEMICAL CO., MIDLAND, MICH., US |
发明人 |
SUH, KYUNG WON, GRANVILLE, OHIO 43023, US |
分类号 |
C08J9/12;C08J9/04;C08J9/14;(IPC1-7):C08J9/14 |
主分类号 |
C08J9/12 |
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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