Patent · US Expired

Process and device for preparing (cyclo)aliphatic biuret groups-containing polyisocyanates

US6066759A · kind A · utility

7Cited by

10References

24Claims

0Family size

Assignee

BASF SE

Inventors

Wolfgang Heider · Neustadt, DE
Stefan Wolff · Sunnyvale, US
Bernd Bruchmann · Ludwigshafen, DE
Klaus Bittins · Bischofswerda, DE

Key dates

Filing date	Mar 9, 1998
Grant date	May 23, 2000
Priority date	—
Expiry date	Mar 9, 2018

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01J2219/185
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

In a process and an apparatus for preparing (cyclo)aliphatic polyisocyanates containing biuret groups from (cyclo)aliphatic diisocyanates and steam or a substance capable of splitting off water as reactants which are mixed with one another in a stirred reactor, the reactants are passes in countercurrent through a cascade-type stirred reactor comprising at least two stages. The dispersion of the gaseous reactant in the liquid reactant is reinforced by baffles installed in the stirred reactor. As baffles, use is made of discs provided with central openings and arranged at a distance from one another and/or strip baffles running in the longitudinal direction of the stirred reactor.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.