发明名称 |
Verfahren zur Herstellung von Polyisocyanaten der Diphenylmethanreihe mit vermindertem Farbwert |
摘要 |
A method for the production of polyamines of the diphenylmethane series involves acid-catalyzed reaction of aniline with formaldehyde. The reaction mixture is neutralized with a base at above 110 degrees C, or heated to above 110 degrees C after neutralization with a base. An Independent claim is also included for a method for the production of polyisocyanates of the diphenylmethane series, by phosgenation of the polyamines obtained by the new method. |
申请公布号 |
DE50209217(D1) |
申请公布日期 |
2007.02.22 |
申请号 |
DE2002509217 |
申请日期 |
2002.08.12 |
申请人 |
BAYER MATERIALSCIENCE AG |
发明人 |
HAGEN, TORSTEN, DR.;KAEMPER, FRIEDHELM, DR.;KOCH, DANIEL, DR.;MUELLER, HEINZ-HERBERT, DR. |
分类号 |
C07C209/78;C08G12/08;C07C211/50;C07C263/10;C07C265/14;C08G12/40;C08G18/76;C08G73/02 |
主分类号 |
C07C209/78 |
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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