Rhodia Chimie

Rhone-poulenc Chimie

Rhodia Limited

Other

The Procter Gamble Company

Christian Priou

Jacques Cavezzan

Jean-Pierre Fouassier

Frederic Castellanos

Philippe Jost

Leo Zhaoqing Liu

Michel Peignier

Jacques Richard

Jean-Marc Frances

Gerard Mignani

Michel M Gay

Fabrice Bohin

Michel Dury

Stuart R Kerr, Iii

Andre Soldat

Jean-Louis Bertry

Mark Robert Sivik

Bernard William Kluesener

Glenn Thomas Jordan, Iv

Yves Bomal

Paul-Joel Derian

Nathalie Guennouni

Robert Violland

Reeshemah L Beaty

Pierre Barruel

Christian Fischer

Fr&eacute;d&eacute;ric Leising

Paul William Huber, Jr

Philippe Neyraval

Andr&eacute; Soldat

Eric Gaulle

Patricia Beurdeley

A method of grafting galactomannan-type polysaccharide polymers, preferably guar, to a functional group by irradiation with high energy electron beams in the presence of an unsaturated monomer-compressing the described functional group. The method may include the depolymerization of the grafted polymer to a pre-selected low molecular weight. The preferred galactomannans for treatment according to this method are guar gum, guar splits and hydroxypropyl guar. In a preferred embodiment the guar gum is also depolymerized, preferably to a molecular weight of below about 700,000 Daltons, and most preferably to a molecular weight of between about 100,000 Daltons to about 250,000 Daltons. The depolymerized guar most preferably has a polydispersity of less than about 3.0 and is useful in oil well fracturing to enhance oil production.

Grafting polymerization of guar and other polysaccharides by electron beams

A silicone composition which can be used in the production of varnishes that can be applied to supports to reduce the friction coefficient. The silicone composition includes at least one polyorganosilane A (POS) which can be cationically and radically cross-linked by functional cross-linking groups (GER) and a primer C chosen from onium borates. The composition also includes molecules (POS D) which are substituted by secondary functional groups (GFS) caned by silicon atoms and selected from those that include at least one alkoxy and/or epoxy and/or carboxy motif and optionally a charge (e.g. silica). The composition can be used with antifriction varnishes for RTV silicone coatings for material used in airbags, thermal transfer ribbons or packing films 

Silicone composition used in the production of antifriction varnishes, method for the application of said varnishes to a support and support thus treated

A method of depolymerizing galactomannan-type polysaccharide polymers and xanthan, preferably galactomannans, to a pre-selected lower molecular weight by irradiation with high energy electron beams. The preferred galactomannans for treatment according to this method are guar gum, guar splits and hydroxypropyl guar. In a preferred embodiment the guar gum is depolymerized preferably to a molecular weight of about 150,000 Daltons to about 200,000 Daltons. The depolymerized guar has a polydispersity of less than about 3.0 and is useful in oil well fracturing to enhance oil production.

Molecular weight reduction of polysaccharides by electron beams

The invention relates to silicone compositions that are used in the production of varnishes that can be applied to supports in order to reduce the friction coefficient. The inventive composition comprises at least one polyorganosiloxane A (POS) which can be cationically and radically cross-linked by functional cross-linking groups (GFR) and a primer C chosen from onium borates, characterized in that the inventive composition also comprises molecules (POS D) which are substituted by secondary functional groups (GFS) carried by silicon atoms and selected from those that include at least one alkoxy and/or epoxy and/or carboxy motif and optionally a charge (e.g. silica). The invention can be used with anti-friction varnishes for RTV silicone coatings for material used in air bags, thermal transfer ribbons or packing films.

The invention concerns a novel method for preparing tetrakis(pentafluorophenyl)borate derivatives of general formula MB(C F ) , M being selected among Na , Li , or K , wherein: (a) a C F X solution, X being selected among H, Cl, Br or I, in anhydrous butylic ether is contacted with an alkyllithium, the mol ratio of C F X/alkyllithium being 1 to 1.1, and the alkyl radical, linear or branched comprising 1 to 10 carbon atoms; (b) the resulting product is contacted with previously non-dissolved BR , R, identical or different being selected among a chlorine atom, a fluorine atom, a bromine atom, an alkoxy radical comprising between 1 and 4 carbon atoms.

Process for the preparation of tetrakis (pentafluorophenyl) borate derivatives

Process for alkoxylation with a boron-containing catalyst

Polymerization and/or crosslinking method under electron beam and/or gamma radiation

Method for preparing tetrakis (pentafluorophenyl) borate derivatives

Process for preparing ether-capped poly(oxyalkylated) alcohol surfactants

The invention concerns the manufacturing, on an industrial scale, of multifunctional polyorganosiloxanes. The process of the invention is a (semi) continuous method of manufacturing polyorganosiloxanes with Si-alkyl and SiOR (R-alkyl) functionality, in which: 1. A dehydrogenocondensation reactor A is continuously fed with one polyorganosiloxanes with SiH, a ROR alcohol and platinum; 2. The gas formed is evacuated and recuperated continuously by eliminating the hydrogen H it contains and by recycling the ROH by condensation; 3. The polyorganosiloxanes with SiH and with SiOR derived from 1., is immediately transferred in a hydrosilylation reactor B, to recuperate finally one polyorganosiloxanes with Si-alkyl and with SiOR.

Process for the manufacture of multifunctional polyorganosiloxanes (POSs) by dehydrocondensation and hydrosilylation, and device for carrying out this process

Process for alkoxylation in the presence of rare earth triflimides

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 present invention relates to multifunctionalized polyorganosiloxanes comprising, per molecule at least one functional siloxy unit Y having C alkoxy radical and at least one other functional siloxy unit W having an halogenated or polyhalogenated alkyl, aralkyl or aryl; polyether ether; epoxidized alkyl; alkoxyalkyl; hydroxylated, carbonylated or esterified alkyl; phenol; and alkoxysilyl; and optionally at least one siloxy unit having a SiH group. The alkoxy functionality Y is introduced onto a suitable polyhydroorganosiloxane by a dehydrogenation/condensation reaction from the alcohol from which Y derives and then the non-hydrogen functionality W by a hydrosilylation reaction from the olefinic compound from which W derives. The multifunctionalized polyorganosiloxanes can be used as antiadhesion modulators in silicone compositions.

Functionalized polyorganosiloxanes and one of the processes for the preparation thereof

The invention concerns a novel method for preparing non-toxic resins crosslinkable under radiation in the presence of an initiator system. Said resins are prepared from compositions of an organic and/or silicon type comprising monomers, oligomers and/or polymers with organofunctional groups, and are cross-linked in the presence of an initiator system consisting of an onium salt with low toxicity whereof the cationic structure is &lsqb;(CH(CH,),&mdash;C,H,&mdash;)&mdash;I&mdash;(&mdash;R,)&rsqb;&plus;(I).

Non-toxic initiators and their use for preparing stable and non-toxic polymers

Growing community of inventors

West Windsor, NJ, United States of America

Christian Priou