Solvay (societe Anonyme)

Solvay Sa

Imertech Sas

Imerys Sa

Roberto Rosa

Karine Cavalier

Didier Sy

Claude Vogels

Bernard Bataille

Michele Delalonde

Gilles Baylac

Gaëlle Rodary

Alberto Galasco

Gianfranco Cervellati

Alkaline earth metal carbonate exhibiting a resistance to acids expressed as pH of less than 7 measured after suspending 1.0 g of the particles in a mixture made of 20 ml of toluene and 80 ml of an aqueous phase consisting of deionized water, 11.76 g/L of citric acid monohydrate, 2.57 g/L of NaCl and 0.068 mol/L of NaOH, after 35 minutes of stirring at 25&#xb0; C. and at 1 000 rpm, or expressed as a moisture pick-up lower than or equal to 2 g water/kg of calcium carbonate after one week of storage at 22&#xb0; C. and 50% relative humidity, or as a Differential Scanning Calorimetry (DSC) spectrum showing at least one peak between 170 and 190&#xb0; C. when measured at a heating rate of 10&#xb0; C./min under nitrogen atmosphere from 25 to 250&#xb0; C. in open cells. Process for the preparation of said particles, compositions containing said particles and the use thereof.

Acid resistant particles of an alkaline earth metal carbonate

Tablet comprising at least one biologically active substance and an excipient, in which the excipient contains calcium carbonate and at least one additive selected from fatty acids, their salts, their esters, lipid materials, polysaccharides, polyvinylpyrrolidone and polyvinylpyrrolidone derivatives, acrylic compounds, mono-, di- or triglyceride esters, animal proteins, and mixtures of at least two of these. Method for producing these tablets. Use of calcium carbonate in tablets containing at least one biologically active substance, for the prolonged release of this substance.

Tablets comprising a biologically active substance and an excipient containing calcium carbonate

The present invention relates to particles of an alkaline earth metal carbonate which are at least partially coated with at least one coating agent and which have a specific surface of more than 50 mgbefore coating. Preferably, the alkaline earth metal is calcium and the coating agent comprises a compound selected from the group consisting of organic sulfonic acids, alkylsulfates, fatty acids and the salts thereof.

Coated particles of calcium carbonate having a high specific surface

Process for the production of precipitated calcium carbonate particles, structured at the nanoscale, by carbonation of milk of lime in the presence of a crystallization controller selected from the following list: polyaspartic acid, dioctyl sodium sulphosuccinate, polyacrylic acid, the molecular weight of which is between 500 and 15 000, and citric acid. When the crystallization controller is citric acid, its concentration in the milk of lime is between 5 and 15%.

Method for obtaining precipitated calcium carbonate particles of nanometric scale structure

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Ranco, Italy

Roberto Rosa