Organic compounds -- part of the class 532-570 series – Organic compounds – Chalcogen in the nitrogen containing substituent
Patent
1999-05-25
2000-07-18
Sergent, Rabon
Organic compounds -- part of the class 532-570 series
Organic compounds
Chalcogen in the nitrogen containing substituent
528 51, 528 67, 528 73, 528 74, 544 68, 544193, 544222, C07D27304, C07D25134, C08G 1816, C08G 1879, C08G 1872
Patent
active
060909390
ABSTRACT:
The present invention relates to a process for the preparation of trimerized polyisocyanates that contain at least 30 mole % of iminooxadiazinedione groups (asymmetric trimers) in the trimer mixture, by catalytically trimerizing a starting isocyanate selected from organic di- or polyisocyanates having a number average molecular weight of 140 to 600 and containing aliphatically, cycloaliphatically and/or araliphatically bound isocyanate groups in the presence of a quaternary phosphonium polyfluoride trimerization catalyst corresponding to the formula
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J. Thermal Anal. 1983, pp. 215-228.
Groth Stefan
Litz Wilfried
Richter Frank
Stelter Eberhard
Bayer Aktiengesellschaft
Gil Joseph C.
Roy Thomas W.
Sergent Rabon
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