Rhodia Chimie

Michelin Recherche Et Technique S.a.

Centre National De La Recherche Scientifique

Symyx Technologies, Inc.

Bluestar Silicones France Sas

Bluestar Silicones France

Societe Detechnologie Michelin

Centre National De La Recherche Scientifique-cnrs

Sébastien Sterin

Delphine Blanc-Magnard

Alain Pouchelon

Laurent Guy

Catherine George

Michel Fernandez

José Carlos Araujo Da Silva

Rémi Thiria

Istvan Marko

Olivier Buisine

Eric D Carlson

Laurent Saint-Jalmes

Etienne Fleury

Christian Prud'Homme

Pierre Robert

Anne Veyland

Karine Longchambon

Yves Giraud

Stefan Breunig

Antoine Baceiredo

Thomas Crevier

Fabio Zanandrea

Anne-Marie La Pointe

Jean-Pierre Delarche

Nathalie Binde

Christian PRUD'HOMME

Tyre and rubber composition for tyre, based on at least one isoprene elastomer (for example natural rubber), an inorganic filler as reinforcing filler (for example silica) and a coupling system which provides the bonding between the said reinforcing inorganic filler and the isoprene elastomer, the said coupling system comprising, in combination:

Rubber composition for tire comprising an organosilicon coupling system

Elastomer isoprene rubber compositions contain an effective amount of a polyfunctional coupling system (A) as an inorganic-elastomer filler coupling agent, and (B) at least one elastomer of natural or synthetic rubber; (C) an inorganic filler as reinforcing filler; (D) other conventional constituents or additives comprising one or more vulcanizing agent(s), the polyfunctional coupling system being of the constituents (A1) and (A2): (A1) is at least one coupling agent selected from among the functionalized organosilicon compounds of formula (I): [(G)SiO][(G)SiO][GSiO][Si][(G)(G)(Z&#x2014;CO&#x2014;N&#x2550;N&#x2014;CO-A)SiO]and (A2) is at least one coupling agent selected among polysulfurated 'symmetric' silanes, or sulfurated 'asymmetric' silanes.

Rubber compositions comprising two different coupling agents and also inorganic fillers

Thermally-stable silicone elastomers are prepared from organopolysiloxane compositions by polyaddition, polycondensation or vulcanization reactions in the presence of peroxide; the thermal stability of the silicone elastomers is achieved by the inclusion of an additive derived from an iron (III) complex.

Thermally-stable crosslinked silicone elastomers

Elastomeric isoprene rubber compositions contain an effective amount of a coupling system (A) as an inorganic filler/elastomer coupling agent, and (B) at least one natural or synthetic rubber elastomer, (C) an inorganic filler as reinforcing filler, (D) other conventional constituents or additives comprising (a) vulcanization agent(s), the coupling system (A) being a particular mixture of the following combination of constituents (A1) and (A2): (A1) is at least one coupling agent selected from among the following functionalized organosilicon compounds of formula (I):[(G)SiO][(G)SiO][GSiO][SiO][(G)(G)(Z&#x2014;CO&#x2014;N&#x2550;N&#x2014;CO-A)SiO]and (A2) is at least one coating agent for the reinforcing filler including one compound with the single function Y in the structure thereof which is capable of bonding physically and chemically to the inorganic filler and resulting in an increase in dispersion of the charge within the rubber matrix and a reduction in viscosity of the composition.

Rubber compositions comprising coupling agents and coating agents and also inorganic fillers

Elastomeric isoprene rubber compositions contain an effective amount of a coupling agent (A) comprising an organosilicon compound with coupling agent functions for inorganic/elastomeric fillers and include (B) at least one natural or synthetic rubber elastomer, (C) an inorganic filler as reinforcement filler, (D) other conventional constituents or additives comprising vulcanization agents; the coupling agent (A) being a functionalized organosilicon compound, including the following two compounds (i) and (2i), (i) being at least one functionalized siloxane corresponding to the formula (I): [(G)SiO][(G)SiO][GSiO][SiO][(G)(G)(Z&#x2014;CO&#x2014;N&#x2550;N&#x2014;CO-A)SiO]and (2i) being a mixture of at least one functionalized siloxane (i) with (3i) at least one functionalized organosilane also corresponding to formula (I) where m=n=o=p=0 (zero), q=1, a=0, 1, 2 or 3 and the sum a+a'=3.

Rubber compositions comprising organosilicon coupling agents and inorganic fillers

A subject-matter of the present invention is a rubber composition intended for the manufacture of tires or of tire semi-finished products, based on at least one isoprene elastomer, an inorganic filler as reinforcing filler and a polyfunctional organosiloxane coupling agent capable of providing the bonding between the reinforcing inorganic filler and the isoprene elastomer, comprising per molecule, grafted to its silicon atoms, on the one hand at least one hydroxyl or hydrolysable functional group allowing it to be grafted to the reinforcing inorganic filler and, on the other hand, at least one group bearing at least one azodicarbonyl functional group &#x2014;CO&#x2014;N&#x2550;N&#x2014;CO&#x2014; allowing it to be grafted to the isoprene elastomer.

Rubber composition for tire comprising an organosiloxane coupling agent

The synthesis of purified functionalized organosilicon compounds containing at least one active azo group having formula (I): [(G)SiO][(G)SiO][GSiO][SiO][(G)(G)(Z&#x2014;CO&#x2014;HN&#x2550;NH&#x2014;CO-A)SiO] entails providing at least one hydrazino (&#x2014;HN&#x2014;NH&#x2014;) precursor (II) of the compound (I) and oxidizing the precursor (II) into an azo group specific to the compound (I) with the aid of an oxidizing system comprising at least one oxidant (Ox) and at least one base (B), wherein 1) Ox is selected from among the oxidants that can oxidize a hydrazine function into an azo function, with or without the exclusion of N-bromosuccinimide (NBS), 2) and/or Ox (optionally B) is/are employed in stoichiometric quantities in relation to the precursor (II); 3) and/or the organosilicon compounds (I) thus prepared are subjected to a purification post-treatment to eliminate any unwanted residues of the base B used, with the proviso that, when NBS is not excluded, characteristic (1) is combined with characteristic (2) and/or characteristic (3).

Preparation of organosilicon compounds

This invention is directed to stabilizing additives that contain at least one platinum complex, with the complex including a carbene group. The stabilizing additives make it possible to improve the resistance to decomposition of silicone elastomers under high temperatures. The additive can be used in a polyorganosiloxane composition intended for the production of a silicone elastomer with either crosslinks at high temperature under the action of organic peroxides or crosslinks at ambient temperature or with heat by polyaddition reactions in the presence of a metal catalyst.

Use of a specific platinum compound in order to improve the resistance of silicon elastomers to degredation caused by very high temperatures

Functionalized organosilicon compounds comprising at least one activated azo group of formula (I): [(G)SiO][(G)SiO][GSiO][SiO][(G)(G)(Z-CO&#x2014;HN&#x2550;NH&#x2014;CO-A)SiO], for example a mixture of silane species of formula (i): (CHO)Si&#x2014;(CH)&#x2014;NH&#x2014;CO&#x2014;N&#x2550;N&#x2014;COOCH; with siloxane species of formulae: (20.1): [(CH)SiO] [(CHO){(CH)&#x2014;NH&#x2014;CO&#x2014;N&#x2550;N&#x2014;COOCH} SiO] and (20.2): [(CH)SiO][(CHO) {(CH)&#x2014;NH&#x2014;CO&#x2014;N&#x2550;N&#x2014;COOCH} SiO], are prepared from at least one hydrazino precursor (II) (&#x2014;HN&#x2014;NH&#x2014;) of compound (I), by oxidizing the precursor (II) into an azo group for the compound (I) utilizing at least one oxidizing agent (Ox) and at least one vase (B) and also a supplementary reagent selected from among silanes of formula (III): (G DEG)4-p1Si (G)p1 [for example, (CH)(CHO)Si].

Organosilicon compounds and process for the preparation thereof

A method for preparing polyorganosiloxanes (POS) by a ring-opening polymerization and/or linear, non-linear or cyclic POS redistribution in the presence of a nucleophilic carbene. The initial efficiency of the POS conversion is substantially increased at low temperature, resulting in less residual content of initial POS.

Method for preparing PolyOrganoSiloxanes (POS) by ring (S)&#x2014;opening polymerization and/or POS redistribution in the presence of carbene (S) and POS compounds produced by said method

Process for preparing catalyst assemblies by mixing a metal catalyst capable of catalyzing a hydrosilylation reaction and an organophosphorus inhibitor of the formula (I) or of formula (VIII) P(OR), either by mixing the inhibitor into a solution of catalyst in an unsaturated silane or siloxane or by mixing the inhibitor into a gum or oil at a temperature greater than the melting temperature or softening temperature of the organophosphorus compound, then mixing the catalyst. Catalyst assemblies, process for preparing one-component silicone compositions, and resultant compositions.

Catalyst assembly for hydrosilylation, process for preparing it and silicone compositions incorporating it

This invention relates to silicone compositions which can be crosslinked, preferably into elastomers, by hydrosilylation of at least one PolyOrganoSiloxane -A- carrying unsaturated bonds, using at least one polyorganohydrosiloxane &#x2014;B&#x2014; in the presence of a carbene-based metal catalyst &#x2014;C&#x2014; as defined in the description and which optionally comprises at least one inhibitor -D- of the hydrosilylation reaction.

Silicone composition which can be crosslinked into an elastomer by hydrosilylation in the presence of carbene-based metal catalysts, and catalysts of this type

The invention relates to adhesive silicone elastomer compositions which can be crosslinked by polyaddition. The composition, crosslinkable by polyaddition (hydrosilylation), comprises: &#x3b1;/ at least one polyorganosiloxane (POS) bearing ethylenic and/or acetylenic unsaturations [POS with &#x2261;Si-(unsaturated) units]; &#x3b2;/ at least one polyorganosiloxane (POS) with &#x2261;Si&#x2014;H units; &#x3b3;/ a catalytic combination comprising &#x3b3;.1 at least one metallic catalyst (preferably platinum based), &#x3b3;.2 and at least one crosslinking inhibitor; &#x3b4;/ a filler; &#x3b5;/ at least one adhesion promoter; &#x3c1;/ at least one POS resin; &#x3bb;/ at least one thermal resistance agent; and &#x3c6;/ optionally at least one other functional additive. Methods of making and using the subject composition are also described.

Single-component adhesive silicone elastomer composition which can be crosslinked by polyaddition

Process for the preparation of a functionalized silicone oil by hydrosilylation of synthons in the presence of at least one organohydrosilicon compound, characterized in that:

Process for the preparation of silicone oils carrying a group comprising at least one hydrocarbon-comprising ring in which is included an oxygen atom

Organosilicon compounds having at least one &#x2261;SiH unit per molecule are functionalized via heterogeneous catalysis into, for example, epoxidized POS by hydrosilylation between an ethylenically unsaturated epoxide such as VCMX and a hydrogenated POS of the MDD'M type with M=RSiO, D=R&#x2014;SiO, D&#x2032;=RH=SiO, in which R=alkyl, and wherein the viscosity of the final product is controlled, i.e., to limit the parasitic reactions of cationic polymerization by opening of heterocycles, resulting in partial or total gelling of the reaction mixture, said hydrosilylation characteristically being carried out in the presence of at least one inorganic non-nucleophilic base and, optionally, water.

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Saint Cyr au Mont d'or, France

Sébastien Sterin