发明名称 |
Production and use of open cell rigid polyurethane foam |
摘要 |
A method of producing an open cell rigid polyurethane foam which comprises reacting a polyol with a polymethylene polyphenyl polyisocyanate prepolymer with a monool exemplified by diethylene glycol monomethyl ether by use of a substitute such as 1,1-dichloro-1-fluoroethane or methylene chloride as a volatile blowing agent, or a mixture of the volatile blowing agent with water, for trichlorofluoromethane as a blowing agent in the presence of a catalyst, a foam stabilizer and a cell opening agent. The resultant open cell rigid polyurethane foam has a cell size of about 200-250 microns, and is suitable for use, for example, as a core material in a vacuum heat insulating material. The foam may be enclosed in a container under a vacuum of 0.1-0.01 mmHg readily attainable to provide a vacuum heat insulating material of a high heat insulating performance.
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申请公布号 |
US5350777(A) |
申请公布日期 |
1994.09.27 |
申请号 |
US19930095214 |
申请日期 |
1993.07.23 |
申请人 |
MATSUSHITA REFRIGERATION COMPANY;TAKEDA CHEMICAL INDUSTRIES, LTD. |
发明人 |
YUGE, KIYOHIRO;MURAMATSU, HITOSHI;MASUDA, YASUTO;UEKADO, KAZUTAKA;TANIMOTO, YASUAKI |
分类号 |
C08G18/28;C08G18/80;C08J9/14;(IPC1-7):C08G18/00 |
主分类号 |
C08G18/28 |
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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