Use of tin derivatives as catalysts
AssigneeRhodia Chimie
InventorsJean-Marie Bernard, Bernard Jousseaume, Christian Laporte, Thierry Toupance
Life of this patent
Estimating the term…
Abstract
The invention concerns the use as catalyst for transforming carbamates of compounds corresponding to the general formula (I): —Sn (X) (X′) wherein: X′ is selected among chloride, bromide, iodide, thiocyanate radicals, sulphonate radicals, advantageously perfluorinated on the carbon bearing the sulphonate function; X is selected among the values of X′ and among radicals of formula Y-Z; Y is selected among the chalcogen groups, advantageously light (that is oxygen and sulphur); Z is selected in the group consisting of trisubstituted tin, monosubstituted zinc, and the oxygenated acid radicals after ignoring the OH function. The invention is applicable to the coating industry.
Claims17
A transcarbamation process, comprising the step of reacting a carbamate vith an alcohol in the presence of an efficient catalytic amount, as transcarbamation catalyst, of compounds of general formula (I):
- wherein:
- X′ is chloride, bromide, iodide, thiocyanate radicals or sulfonate radicals;
- X is X′ or radicals of formula Y-Z;
- Y is a chalcogen;
- and
- Z is trisubstituted tin, monosubstituted zinc or groups of oxygen-comprising acids, without the OH functional group.
A composition, comprising at least one carbamate capable of being obtained by reaction of a hydroxylated compound with an isocyanate and at least one compound of following general formula (I):
- wherein:
- X′ are sulfonate radicals:
- X is X′ or radicals of formula Y-Z;
- and
- Z is trisubstituted tin, monosubstituted zinc or groups of oxygen-comprising acids, without the OH functional group, wherein the isocyanate is aliphatic, the X′ sulfonate radicals are perfluorinated on the carbon carrying the sulfonate functional group;
- and
- Y is oxygen or sulfur.
Dependencies are inferred from the claim text.