发明名称 |
VERFAHREN ZUR HERSTELLUNG VON NIEDERMOLEKULAREN POLYHYDROXYLVERBINDUNGEN |
摘要 |
<p>Prodn. of mixts. of low mol. polyhydroxy cpds. (I) and opt. hydroxy-aldehydes (II) and hydroxyketones (III) comprises condensn. of HCHO in the presence of Pb (II) cpds. as catalyst and of cocatalysts contg. a mixt. of (II) and (III). In the parent patent, the soln. is kept at pH 6.0-7.0 by controlled addn. of an (in)organic base until the conversion is 10-60% and then at 4.0-6.0. The novelty is that, in the second phase of condensn., the pH is 0.5-3, pref. 0.8-1.7 units lower than that in the first phase. The catalyst pref. is a soluble Pb (II) salt.</p> |
申请公布号 |
DE2732077(A1) |
申请公布日期 |
1979.02.01 |
申请号 |
DE19772732077 |
申请日期 |
1977.07.15 |
申请人 |
BAYER AG |
发明人 |
WAGNER,KUNO,DR.;PETER,DR. MUELLER,HANNS;SCHNEIDER,GOTTFRIED,DR. |
分类号 |
C07C29/38;C07C45/00;C07C45/75;(IPC1-7):C07C31/18;C07C49/17;C07C47/19 |
主分类号 |
C07C29/38 |
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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