发明名称 |
Process for the production of polyisocyanates having a high iminooxadiazindione group content |
摘要 |
A process for the production of polyisocyanates having at least 30 mol% iminooxadiazindione group content comprises use of a quat. ammonium and/or phosphonium fluoride catalyst with a solvating agent. A process for the production of polyisocyanates (I) containing at least 30 mol% iminooxadiazindione group (asymmetric trimer) (with respect to total quantity of isocyanurate and iminooxadiazindione groups), comprises catalytically induced trimerization of organic di-or polyisocyanates having an average mol. wt. of 140-600 g/mol and aliphatic and/or araliphatic bound isocyanate groups. The trimerization catalyst is a quat. ammonium and/or phosphonium fluoride of formula (1) which is used pure or mixed with a solvating agent (S) for the fluoride anion. (S) is a pure compound or a mixture of protic compounds having a pKa of greater than 2 (in H2O at 25 deg C) or is oxalic acid but excluding higher functional alcohols (di and/or polyols) or HF. The molar ratio of (S) to F<-> is no greater than 20. R4E<+>F<-> (1) E = N or P; R = 1-20C aliphatic, aromatic and/or araliphatic group, optionally forming saturated or unsaturated cyclic rings with N or P; n = 0.1-20
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申请公布号 |
DE19824485(A1) |
申请公布日期 |
1999.12.09 |
申请号 |
DE19981024485 |
申请日期 |
1998.06.02 |
申请人 |
BAYER AG |
发明人 |
RICHTER, FRANK;STELTER, EBERHARD;LITZ, WILFRIED;GROTH, STEFAN |
分类号 |
C07D251/34;C07D273/04;C08G18/02;C08G18/16;C08G18/78;C08G18/79;(IPC1-7):C07D251/34;C09D175/04;B01J27/14;C07F9/54;C07F9/656 |
主分类号 |
C07D251/34 |
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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