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US 2005/0033006 A1Published application
New catalysts for selective isocyanate dimerization
AssigneeBayer MaterialScience AG
InventorsJurgen Kocher, Hans-Josef Laas
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Abstract
A method of dimerizing isocyanates using sulphonamide anions as a dimerization catalyst for the isocyanates and also to a process for preparing oligomeric isocyanates using such catalysts.
Claims18
A method of dimerizing isocyanates comprising reacting the isocyanates in the presence of sulphonamide salts according to the formula (I)
- in which
- R1 is an aliphatic, cycloaliphatic, aromatic or araliphatic, optionally heteroatom-containing radical which is optionally substituted,
- Het is a radical selected from the group consisting of thiazolyl, benzthiazolyl, 2-pyrimidyl, 4-pyrimidyl, 2-pyridyl and 4-pyridyl and is optionally substituted and
- Ion(+) is an organic or inorganic cation.
1 more element
A method of preparing oligomeric isocyanates comprising reacting
- a) one or more organic compounds having an average NCO functionality≧1 in the presence
- b) of a catalyst comprising one or more sulphonamide salts, and
- c) optionally solvents;
- wherein the sulphonamide salts conform to figure (I):
- wherein
- R1 is an aliphatic, cycloaliphatic, aromatic or araliphatic, optionally heteroatom-containing radical which is optionally substituted,
- Het is a radical selected from the group consisting of thiazolyl, benzthiazolyl, 2-pyrimidyl, 4-pyrimidyl, 2-pyridyl and 4-pyridyl and is optionally substituted and
- Ion(+) is an organic or inorganic cation.
5 more elements
Dependencies are inferred from the claim text.