Chemtura Corporation

Rhodia Chimie

Thierry Toupance

Bernard Jousseaume

Uwe Schneider

Karine Darriet

Jean-Marie Bernard

Christian Laporte

Supported heterogeneous organotin catalysts of the formula X1, X2, or X3: 

Heterogeneous organotin catalysts

The invention concerns the use as catalyst for transforming carbamates of compounds corresponding to the general formula (I): &#x2014;Sn (X) (X') wherein: X&#x2032; 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&#x2032; 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.

Use of tin derivatives as catalysts

The invention concerns a novel catalyst for forming urethanes. Said catalyst is characterized by the general formula: MY[Z], wherein: Z is the radical corresponding to the anion of a super acid whereof the Hamett constant is at least equal to 13 and advantageously more than 13, M representing a trivalent metal, preferably known for forming Lewis acids; Y is an anion or a monovalent anionic function; and q is an integer selected advantageously between 1 and 3, inclusively. The invention is applicable to paint.

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Talence, France

Thierry Toupance