发明名称 |
Fractionation process of reaction mixture containing methylene bridged polyphenylene polyisocyanate |
摘要 |
<p>A fractionation process of a methylene bridged polyphenylene polyisocyanate mixture obtained by phosgenating condensation product of aniline and formaldehyde is disclosed. In order to apply the above mixture to a variety of uses, the process separates the mixture into fractions by giving primary attention to the content of 4,4'- and 2,4'-isomer of diphenylmethane diisocyanate and at the same time reduces the content of impurities having acidity and hydrolyzable chlorine.</p> |
申请公布号 |
EP0482490(B1) |
申请公布日期 |
1998.09.02 |
申请号 |
EP19910117622 |
申请日期 |
1991.10.16 |
申请人 |
MITSUI CHEMICALS, INC. |
发明人 |
ISHIDA, NORITOSHI;TASHIMA, ZUNZI;SHIMAMATSU, MITSUNORI;NITTA, KAZUNARI;NAGOU, TAKASHI |
分类号 |
C07C263/10;C07C263/20;C07C265/14;C08G18/76;(IPC1-7):C07C263/10;C08J11/02 |
主分类号 |
C07C263/10 |
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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