Rhodia Chimie

Other

Michelin Recherche Et Technique S.a.

Rhodia Operations

Saint Gobain Isover

Kerneos

Rémi Valero

Yvonick Chevallier

Julien Hernandez

Dominique Petit

Adrien Dromard

Olivier Durel

Pierre-Yves Lahary

Arnaud Lapra

Joël Racinoux

Bernard Lericque

Kyu-Min Hwang

Soline De Cayeux

Lionel Sever

Franck Schroeder

Youn-Kwon Yoo

Philippe Deffrasnes

Jean-Noel Jas

Joel Racinoux

Soline Daudey

Jean-Noël Jas

Alexis Ponnouradjou

The invention relates to the use of carboxylic acid during the preparation of precipitated silica or a suspension of precipitated silica and to the precipitated silicas thus obtained, particularly with low water uptake, which can be used, for example, as a reinforcing filler in silicon matrices.

Preparation of precipitated silicas useful as fillers in silicon matrices

The invention relates to a novel method of preparing silicas and to highly-structured silicas having the following characteristics: a specific surface area CTAB (S) of between 40 and 525 m/g; a specific surface area BET (S) of between 45 and 550 m/g; an object size distribution width Ld ((d84&#x2212;D16)/d50), which is measured by XDC particle size analysis after deagglomeration with ultrasound, of at least 0.91; and a pore-size distribution such that ratio V(d5&#x2212;d50)/V(d5&#x2212;d100) is at least 0.66. The invention also relates to the use of said silicas as polymer reinforcing fillers.

Method of preparing silicas, silicas with specific pore-size and/or particle-size distributions, and the uses thereof, in particular for reinforcing polymers

The invention relates to a highly-structured precipitated silica having a low water uptake and high dispersibility in different pasty or solid matrices or media, elastomers or silicon, and to the preparation method thereof. The invention also relates to the use of said silica, for example, as a reinforcing filler in matrices based on elastomers (clear or semi-clear for shoe soles), in silicon matrices (in particular, for the coating of electric cables), as a filler and/or support and/or vehicle in different compositions (food compositions, cosmetic compositions, pharmaceutical compositions, compositions for the production of paints or paper, compositions for the production of porous membrane separators for batteries) or as a thickening agent in toothpastes.

Highly-structured silica having a low water uptake, preparation method thereof and uses of same

The invention concerns a method for preparing low water uptake precipitated silicas, comprising successive steps which consist in: (a) producing an initial starter including a silicate, the silicate concentration in said starter, expressed in SiOequivalent, being less than 15 g/L; (b) bringing the medium pH to a value ranging between 7 and 8 by adding an acidifying agent, (c) in the resulting medium, simultaneously adding a silicate and an acidifying agent the respective amounts of silicate and acidifying agent added in time being specifically such that, during the entire addition (1) the reaction medium pH stays between 7 and 8, and (ii) the silicon concentration in the medium, expressed in SiOequivalent, stays below 35 g/L; (d) adding an acidifying agent in the medium resulting from step (c), so as to bring the medium to a pH ranging between 3 and 6.5; and (e) filtering the resulting aqueous silica dispersion, then drying the filter cake obtained at the end of the filtering step. The invention also concerns low water uptake silicas obtained by said method and their use, in particular for reinforcing silicones or polymer or elastomer matrices.

Low water uptake silicas

Diene rubber compositions are described containing a diene elastomer, a reinforcing inorganic filler, and a coupling agent wherein the inorganic filler includes a silica having the following characteristics:

Diene rubber composition for tire comprising a specific silica as reinforcing filler

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Lyons, France

Rémi Valero