Centre National De La Recherche Scientifique

Luzenac Europe Sas

Talc De Luzenac

Imerys Talc Europe

Centre National De La Recherche Scientifique-cnrs

Didier Arseguel

Francois Martin

Jean-Pierre Bonino

Jocelyne Ferret

Eric Ferrage

Sabine Petit

Olivier Grauby

Alain Decarreau

Cedric Lebre

Cederic Lebre

Pierre Charles Goffinet

Brigitte Riviere

The invention relates to a method for preparing a composition, that is a talcose composition, comprising synthetic mineral particles which contain silicon, germanium and metal, have a crystalline and lamellar structure, and are of formula (SiGe)MO(OH), wherein M is at least one divalent metal and is of formula MgCOZnCuMnFeNiCr, and x is a real number of the interval [0; 1]. According to said method, a gel containing silicon, germanium and metal, of formula &#x2014;(SiGe)MO, n'HO&#x2014;, in the liquid state, is subjected to a hydrothermal treatment over a defined period of time and at a temperature of between 300&#xb0; C. and 600&#xb0; C., said time and temperature being selected according to the desired particle size and structural stability for the mineral particles containing silicon, germanium and metal, to be prepared.

Method for preparing talcose compositions comprising synthetic mineral particles containing silicon, germanium and metal

The invention relates to a method for preparing a synthetic talc composition. According to said method, a kerolite composition is subjected to an anhydrous thermal treatment carried out at a pressure lower than 5 bar, from over a few hours up to over a few days, at a treatment temperature higher than 300&#xb0; C. The invention also relates to a synthetic talc composition prepared in this way, the synthetic talc particles of the composition being exclusively of chemical formula &#x2014;(Si)MgO(OH)&#x2014; and identifiable, during X-ray diffraction, by the presence of a characteristic diffraction peak located at a distance of between 9.40-9.68 and corresponding to a plane (001). Said synthetic talc particles also have a thermally stable crystalline structure of stacked laminae, which is very similar to that of a natural talc and has a particle size smaller than approximately ten micrometers.

Method for preparing a synthetic talc composition from a kerolite composition

A method for preparing a composition including mineral particles, that is swelling TOT-TOT interlayer particles, formed by interlayering between: at least one non-swelling mineral phase formed by a stack of elementary laminae of the phyllogermanosilicate 2/1 type and of formula &#x2014;(SiGe)MO(OH)&#x2014;, and at least one swelling mineral phase formed by a stack of elementary laminae of the phyllogermanosilicate 2/1 type and at least one interlaminar space between two consecutive elementary laminae, the swelling mineral phase being of formula &#x2014;(SiGe)MO(OH), (M)&#x3b5;'.nHO. The composition is prepared by subjecting a gel containing silicon, germanium and metal, of chemical formula &#x2014;(SiGe)MO,nHO&#x2014;, in the liquid state to a hydrothermal treatment which is carried out over a defined period of time and at a temperature of between 150&#xb0; C. and 300&#xb0; C., the time and temperature being selected according to the desired structural characteristics for the swelling TOT-TOT interlayer particles to be prepared.

Preparation of a composition of a swelling tot-tot interlayer

The invention relates to a method of making a solid product in a form capable of being handled based on hydrophobic mineral powder such as talcum or mica powder, in particular for cosmetic or hygienic use. This process is characterized in that a hydrophobic mineral powder, particularly based on talcum or mica, is impregnated using a volatile liquid binder in proportions by weight such that the proportion of volatile liquid binder is at least equal to 5% and the proportion of mineral powder at least equal to 80%, and in that the resulting impregnated powder is pressed so as to shape it and to provide it with cohesion ensuring the rigidity of the product. The solid product obtained can take the form of a stick ( ) that can be used to ensure a deposit of talcum or mica by contact.

Solid product capable of being handled based on hydrophobic mineral powder

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Deyme, France

Didier Arseguel