Rhodia Chimie

Michelin Recherche Et Technique S.a.

Rhodia Operations

Bluestar Silicones France Sas

Societe Detechnologie Michelin

Bluestar Silicones France

Nathalie Guennouni

Marc Chaussade

Salvatore Pagano

Gérard Mignani

Virginie Pevere

Jean-Claude Tardivat

Kamel Ramdani

Christel Thonier

Gerard Mignani

Christian Priou

Yves Bomal

Olivier Durel

Paul Branlard

G&eacute;rard Mignani

Jean-Christophe Galland

Philippe Karrer

Bernard Vogin

Roland Rauline

Pierre Barruel

The invention relates to a method of preparing polyorganosiloxanes containing at least one functional group using a lithium silanolate catalyst. A polyorganosiloxane, having at least one hydroxyl group, is reacted with a polyalkoxysilane having the formula (R)(R)Si(OR)(I), where Ris an alkyl radical, a cycloalkyl radical, or an aryl radical; Ris &#x2014;(Z)m-(X)n, wherein m=0 or 1, n=1 or 2; Z is a divalent hydrocarbon residue; X is an unsaturated hydrocarbon radical when m=0 and, when m=1, X is chlorine, bromine, iodine, &#x2014;O&#x2014;CO&#x2014;CR&#x2550;CRR(in which R, Rand Reach represent a hydrogen atom, an alkyl radical and/or a phenyl radical), &#x2014;R(in which Ris a perfluorinated residue), &#x2014;NHR(in which Ris a hydrogen atom, an alkyl radical, or a radical-R&#x2014;NH, wherein Ris Z), or &#x2014;SH; Ris an alkyl radical; a=0, 1, 2 or 3; b=0 or 1 and a+b=0, 1, 2 or 3, with the additional condition that the sum a+b=3, symbol b cannot be equal to 0. The method is performed in the presence of an effective quantity of a lithium organosilanolate catalyst having formula (R)(R)(OR)SiOLi(II), wherein R, R, R, a and b have the meanings indicated above. The method is performed without the addition of an aliphatic alcohol having the formula ROH to the reaction medium.

Method of preparing polyorganosiloxane with functional groups in the presence of lithium silanolate

The present invention relates to a process for the preparation of 3-chloropropyldimethylchlorosilane by hydrosilylation reaction in a reaction medium comprising dimethylhydrochlorosilane and allyl chloride, in the presence of a catalytically effective amount of di-&#x3bc;-chlorobis(&#x3b7;-1,5-cyclooctadiene)diiridium, the said process being characterized in that at least one auxiliary in the free or supported state selected from the group of compounds consisting of:

Process for the preparation of halogenoalkyldialkyl chlorosilane

The invention relates to polyorganosiloxane monocomponent compounds (POS) which are stable when stored without humidity and crosslinking into elastomer in the presence of water. The inventive compounds comprise at least one type of crosslinkable linear polyorganosiloxane (POS), a mineral filler and a crosslinking catalyst of formula (I) which provides said compound with an excellent compromise between cross linking kinetics and a storage stability (i.e. more than 6 months).

Polyorganosiloxane monocomponent compound crosslinking into silicone elastomer

The invention concerns the preparation of halogenated monoorganoxysilanes, of formula (I), said compounds being useful as synthesis intermediate in organic chemistry. Said method for preparing monoorganoxysilanes consists in: using as starting product halogenoalkylsilanes of the (CH)SiCltype and in substituting the silicon with a radical bearing a divalent unit bound to an electrophilic reactive group capable of reacting with at least an appropriate nucleophilic agent to form a functionalised monoorganoxysilane of formula (II) with, for example: R&#x3c;1&#x3e;=C-Calkyl; R&#x3c;2&#x3e;, R&#x3c;3&#x3e;=C-Calkyl; B=C-Calkylene; m=1 or 2; Hal=halogen; W=amino, mercapto, (organosilyl)-organopolythio radical.

Method for obtaining halogenated monoorganoxysilanes useful in particular as synthesis intermediates

The invention concerns the preparation of halogenated monoorganoxysilanes, of formula (I), said compounds being useful as synthesis intermediate in organic chemistry. Said method for preparing monoorganoxysilanes consists in: using as starting product halogenoalkylsilanes of the (CH)SiCltype and in substituting the silicon with a radical bearing a divalent unit bound to an electrophilic reactive group capable of reacting with at least an appropriate nucleophilic agent to form a functionalised monoorganoxysilane of formula (II) 

Process for obtaining halogenated monoorganoxysilanes which can be used in particular as synthesis intermediates

The invention relates to the preparation of organodialkylalkoxysilane using a continuous method consisting in bringing an alkanol into continuous contact with an omega-haloalkyl dialkylhalosilane in a countercurrent reactor, such as a plate column or a packed column. The reaction is performed in the aforementioned countercurrent reactor in the presence or absence of a non-reactive solvent with scavenging of the hydrochloric acid formed. The omega-haloalkyl dialkylalkoxysilane thus formed is particularly suitable for use as a starting material for the preparation of organosilicon compounds containing sulphur having general formula (I) by means of sulphidisation reaction on an alkaline metal polysulphide.

Method of preparing organo dialkylalkoxysilane

Single-component silicone compositions which are stable on storage in the absence of moisture and which crosslink by polycondensation reactions catalyzed using a mixed titanium/metal catalyst to give non-yellowing elastomers which adhere to various supports, the reactions being carried out at ambient temperature and in the presence of water; each single-component POS composition comprises: 100 parts by weight of linear diorganopolysiloxane(s) A functionalized at the chain ends by functional group Rof alkoxy, acyloxy, iminoxy or enoxy type; 0 to 30 parts by weight of polysiloxane resin(s) B; 0 to 15 parts by weight of crosslinking agent(s) C; 0 to 2 parts by weight of aliphatic alcohol(s) E; 0 to 30 parts by weight of non-functionalized and unreactive linear diorganopolysiloxane(s) F; 2 to 40 parts by weight of inorganic filler G; 0 to 20 parts by weight of auxiliary agent(s) H; and 1 to 150 &#x3bc;g.at (microgram atom) of the metals M1+M2 per 1 g of single-component POS composition, wherein M1 is selected from among titanium, zirconium and mixtures thereof and M2 is selected from among zinc, aluminum, boron, bismuth and mixtures thereof.

Single-component polyorganosiloxane compositions which crosslink into silicone elastomers

A process for the preparation of a haloalkyldialkylchlorosilane is provided, wherein at the end of a hydrosilylation reaction, the product is recovered and iridium is recovered, the iridium being found in its original form of catalyst or in a converted form, the recovery of the iridium taking place under the following conditions a), b) and c): a) the recovery of the iridium is carried out: 1. either directly on the reaction medium at the end of the reaction, 2. or on the liquid distillation residue, including the byproducts and the iridium or its derivatives, as is obtained after distillation of the reaction medium in order to separate therefrom the product of formula (I), b) the iridium is recovered by bringing the reaction medium or the distillation residue into contact with an effective amount of carbon black which adsorbs the iridium, and c) the carbon black is separated from the iridium for the purpose of recovering the iridium.

Method of preparing halogenoalkyldialkyl chlorosilane

A tire or tire tread incorporating an elastomeric composition having improved vulcanization kinetics, based on at least a diene elastomer, a reinforcing inorganic filler and, as (inorganic filler/elastomer) coupling agent, a bis-alkoxysilane tetrasulfide of the formula: in which:

Tire and tread comprising a bis-alkoxysilane tetrasulfide as coupling agent

The present invention relates to a sulfur-cross-linkable elastomeric composition that is useful for the manufacture of tires. This elastomeric composition is based on at least one isoprene elastomer (in particular natural rubber), a reinforcing inorganic filler (in particular, silica), and an (inorganic filler/isoprene elastomer) coupling agent. The coupling agent is a multifunctional polyorganosiloxane (POS), which comprises functions denoted as 'Y' and 'X', wherein the Y function is at least one hydroxyl or hydrolyzable function grafted to the silicon atoms of the coupling agent and the X function is a group bearing at least one activated ethylene double bond and is grafted to the silicon atoms of the coupling agent. This POS is, in particular, a POS having an imide, acid or ester function, the ethylene double bond of which is activated by at least one adjacent carbonyl group (&#x2014;C&#x2550;O). The present invention further relates to a tire comprising the composition described above as well as semi-finished products for tires, in particular, treads, where the tires comprise a rubber composition according to the present invention.

Rubber composition for a tire comprising a multifunctional polyorganosiloxane as coupling agent

The present invention relates to a process for preparing multifunctionalized polyorganosiloxanes (POSs) comprising alkoxyl functional siloxyl units and siloxyl units each having an SH functional group, which consists in introducing the SH functional group by the reaction of H S on a precursor POS of formula: A&mdash;(RXSiO) &mdash;(RYSiO) &mdash;B where R is especially a C -C alkyl radical, X is a C -C alkoxyl radical, Y is a C -C hydrocarbon group which includes an ethylenically unsaturated group from which the SH functionality derives, a is a number ranging from 1 to 150, b is a number ranging from 1 to 150, the number a&plus;b ranging from 2 to 300 and A and B are terminal groups which are selected respectively, from, in particular, on the one hand (R) SiO&mdash; radicals taken alone or as mixtures with (R) XSiO&mdash; and/or R(X) SiO&mdash; and/or (X) SiO&mdash; radicals and on the other hand &mdash;Si(R) radicals taken alone or as mixtures with &mdash;SiX(R) and/or &mdash;Si(X) R and/or &mdash;Si(X) radicals.

Method for preparing polyorganosiloxanes (POS) with thiol functions, POS obtainable by this method and their use particularly in rubber materials

The invention concerns a novel cross-linkable composition and its use for preparing novel polyurethane films. The cross-linkable composition comprises (a) 20 to 50 wt. % of polyisocyanate, (b) 50 to 80 wt. % of acrylic oligomer containing hydroxyl groupings whose content in weight relative to the acrylic oligomer is between 2.5 and 4.5% and (c) 1 to 10 wt. % of a silicon fluid of formula (1).

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Irigny, France

Nathalie Guennouni