Rhodia Operations

Rhodia Chimie

Compagnie Generale Des Etablissements Michelin

Rhodia (china) Co. Ltd.

Laurent Guy

Eric Perin

Cédric Boivin

Kilani Lamiri

Sylvaine Neveu

Emmanuelle Allain Najman

Pascaline Garbey

Caroline Fayolle

Cédric Feral-Martin

Michel Fernandez

Sébastien Sterin

Dominique Dupuis

Emmanuelle Allain

Virginie Pevere

Julien Hernandez

Thierry Vidal

Floryan De Campo

Thomas Chaussee

Lionel Ventelon

Laure Bertry

Anne-Laure Pinault

Frédéric Colbeau-justin

Cyril Chomette

Zhaoqing Liu

Philippe Jost

Cedric Boivin

Fabien Stocklouser

Stéphanie Croyeau

Stéphane Badaire

Marc Airiau

Cèdric Boivin

Angélique Pawlak

David James Wilson

A precipitated silica containing are least one element M selected from the group consisting of B, Al, Ga and mixtures thereof and characterized by the presence of specific acid sites on its surface and a process for its manufacture. Said precipitated silica is suitable for multiple applications, for instance as catalyst or catalyst support as well as reinforcing filler in polymeric compositions.

Precipitated silica and process for its manufacture

A precipitated silica for use in tire applications. In particular, a precipitated silica characterised by a CTAB surface area Sgreater than 140 m/g; a width of the aggregate size distribution Ld, measured by centrifugal sedimentation, of at least 1.2; a pH of less than 5.5; and a carbon content of less than 1500 ppm.

Precipitated silica with improved processing properties

A chemically modified precipitated silica characterised by the presence of alkyl moieties chemically bound to the silica and a process for its manufacture.

A precipitated silica having a broad particle size distribution and large median particle size as well as its method of manufacture is provided. The precipitated silica has a CTAB surface area Sin the range from 40 to 300 m/g, a difference between BET surface area Sand CTAB surface area Sof at least 35 m/g, a width of the particle size distribution Ld, measured by centrifugal sedimentation, of at least 1.5, an amount of aluminium Win the range from 0.5 to 7.0 wt %, and a median particle size d50, measured by centrifugal sedimentation, such that for a given value of CTAB surface area Sand amount of aluminium W, parameter A, defined by the following equation: A=|d50|+0.782×|S|−8.524×|W|.

A precipitated silica characterised by the presence of specific acid sites on its surface and a process for its manufacture.

The invention relates to a process for the preparation of a novel precipitated silica, wherein: a silicate is reacted with an acidifying agent, so as to obtain a silica suspension; said silica suspension is filtered, so as to obtain a filter cake; said filter cake is subjected to a liquefaction operation, optionally in the presence of an aluminium compound; wherein at least one polycarboxylic acid is added to the filter cake, during or after the liquefaction operation. It also relates to a novel precipitated silica and to its uses.

Process for the preparation of precipitated silicas, precipitated silicas and their uses, in particular for the reinforcement of polymers

The invention relates to a novel process for preparing a precipitated silica, in which: a silicate is reacted with an acidifying agent, so as to obtain a suspension of precipitated silica, said suspension of precipitated silica is filtered, so as to obtain a filter cake, said filter cake is subjected to a liquefaction operation comprising the addition of an aluminum compound, after the liquefaction operation, a drying step is performed, characterized in that at least one polycarboxylic acid is added to the filter cake, during or after the liquefaction operation. The invention also relates to novel precipitated silicas and to uses thereof.

Method of preparing precipitated silicas, novel precipitated silicas, and their uses, in particular for reinforcing polymers

The invention relates to a process for the preparation of a novel precipitated silica, wherein: a silicate is reacted with an acidifying agent, so as to obtain a silica suspension; said silica suspension is filtered, so as to obtain a filter cake; said filter cake is subjected to a liquefaction operation, in the absence of an aluminium compound; wherein a mixture of polycarboxylic acids is added to the filter cake, during or after the liquefaction operation. It also relates to novel precipitated silicas and to their uses.

A rubber composition is based on at least one elastomer, a reinforcing inorganic filler, an agent for coupling the elastomer to the reinforcing inorganic filler, and a crosslinking system. The reinforcing inorganic filler comprises at least one silica S having: a CTAB specific surface area Swithin a range extending from 40 to 300 m/g; a difference between the BET specific surface area Sand the CTAB specific surface area Sof greater than or equal to 35 m/g; an aluminium content Wwithin a range extending from 0.5 to 7.0% by weight relative to the weight of the silica S; a width of the aggregate size distribution Ld, measured by centrifugal sedimentation, of greater than or equal to 1.5; and a median aggregate diameter d50, measured by centrifugal sedimentation, such that for a given value of CTAB specific surface area Sand a given aluminium content W, a magnitude A is defined by the following equation (I): A=[d50]+0.782&#xd7;[S]&#x2212;8.524&#xd7;[W] (I), in which: [d50] is the numerical value of d50, expressed in nm; [S] is the numerical value of S, expressed in m/g; [W] is the numerical value of W, expressed in % by weight relative to the weight of the silica S; and said magnitude A satisfies the relationship (II): A&#x2265;253 (II). The compositions of the invention are of use in tyres or semi-finished articles for tyres.

Rubber composition comprising at least one silica as inorganic reinforcing filler

The invention relates to a process for preparing a precipitated silica, to precipitated silicas, and to uses thereof. The process of the invention generally includes reacting a silicate with an acidifying agent, so as to obtain a suspension of precipitated silica; filtering the precipitated silica to obtain a filter cake; subjecting the filter cake to a liquefaction operation to form a second filter cake; and drying the second filter cake. In the process of the invention, at least one polycarboxylic acid is added to the filter cake, during or after the liquefaction operation

Method for preparing precipitated silicas, novel precipitated silicas, and uses thereof, particularly for polymer reinforcement

The invention relates to a process for preparing a precipitated silica, to precipitated silicas, and to uses thereof. The process of the invention generally includes reacting a silicate with an acidifying agent, so as to obtain a suspension of precipitated silica; filtering the precipitated silica to obtain a filter cake; subjecting the filter cake to a liquefaction operation to form a second filter cake; and drying the second filter cake. In the process of the invention, at least one polycarboxylic acid is added to the filter cake, during or after the liquefaction operation.

Method for preparing precipitated silicas, novel precipitated silicas and uses thereof, particularly for the reinforcement of polymers

The invention relates to a novel process for the preparation of a precipitated silica, in which: It also relates to novel precipitated silicas and to their uses.

Method for preparing precipitated silicas, novel precipitated silicas and their uses, in particular for strengthening polymers

A precipitated silica having a CTAB specific surface in the range of from 50 to 300 m/g; a BET/CTAB specific surface ratio equal to or greater than 1.3 and comprising at least one polycarboxylic acid.

The invention relates to a novel process for preparing a precipitated silica, in which: The invention also relates to novel precipitated silicas and to uses thereof.

Growing community of inventors

Rillieux-La-Pape, France

Laurent Guy