发明名称 |
Process for the production of poly(O-alkylurethanes) of the diphenyl methane series |
摘要 |
The present invention relates to an improved process for the production of monomeric and polymeric poly(O-alkylurethanes) of the diphenyl methane series. The process comprises the reaction of the corresponding amines with dialkyl carbonates in the presence of a catalyst, followed by the isolation of the products in a highly pure form. The invention also relates to the use of the produced monomeric and polymeric poly(O-alkylurethanes) for the production of the corresponding isocyanates. |
申请公布号 |
US5347034(A) |
申请公布日期 |
1994.09.13 |
申请号 |
US19920871914 |
申请日期 |
1992.04.21 |
申请人 |
BAYER AKTIENGESELLSCHAFT |
发明人 |
HAMMEN, GUENTER;SCHIEB, THOMAS;WERSHOFEN, STEFAN |
分类号 |
B01J31/12;C07B61/00;C07C263/04;C07C265/12;C07C269/04;C07C271/26;C08G18/72;C08G71/00;C08G71/04;(IPC1-7):C07C261/00 |
主分类号 |
B01J31/12 |
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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