发明名称 |
MANUFACTURE OF AROMATIC DIIAND*OR POLYISOCYANATE |
摘要 |
This invention pertains to a process for the preparation of an aromatic di- and/or polyisocyanate comprising the steps of A. preparing an aromatic di- and/or polyurethane by 1. reacting a primary aromatic di- and/or polyamine with an O-alkyl carbamate at temperatures greater than 100 DEG C.; 2. separating the ammonia and other by-products from the aromatic di- and/or polyurethane; B. heating and the aromatic di- and/or polyurethane at temperatures of from 175 DEG C. to 600 DEG C.; and C. isolating the di- and/or polyisocyanate resulting from step B. |
申请公布号 |
JPS5665858(A) |
申请公布日期 |
1981.06.03 |
申请号 |
JP19800142171 |
申请日期 |
1980.10.13 |
申请人 |
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发明人 |
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分类号 |
C07C265/14;C07C67/00;C07C241/00;C07C263/04;C07C265/12;C07C271/06 |
主分类号 |
C07C265/14 |
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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