Rhone-poulenc Chimie

Rhone-poulenc Specialites Chimiques

Rhodia Operations

Ciba-geigy Corporation

Rhone-poulenc Specialties Chimiques

Jacques Cavezzan

Christian Priou

Frederic Castellanos

Jean-Pierre Fouassier

Jean-Marc Frances

Christian Prud'Homme

Lars Fischer

Claude Millet

Gerard Soula

Stephan Verdier

Louis Giral

Michel Peignier

Sébastien Lomel

Francois Schue

Christelle Chretien

Terry Chamberlain

Christian Rouyer

Jean-François Thome

Jean-Louis Di Martino

Sylvianne Dumas

Pierre Lancelin

Edith Cavinenc

A process for unloading a container containing an oxidizable compound having a melting point Tgreater than 15&#xb0; C. is described. This process comprises the steps consisting in heating the container using a heating means until the oxidizable compound is liquid, the temperature of the heating means remaining less than or equal to T+105&#xb0; C., and then unloading the oxidizable compound in the liquid state. A process for handling such an oxidizable compound, comprising this unloading step, and also a device enabling this process to be carried out, are also proposed.

Method for discharging an oxidisable compound in the liquid state

The invention relates to a process for preparing concentrated solutions of polymerization inhibitor, that can be used for the production, purification and storage of monomer compositions. This process comprises a step in which at least one polymerization inhibitor in the molten state is mixed with a solvent.

Process for preparing a polymerization inhibitor solution

The invention describes a composition that inhibits the polymerization of ethylenically unsaturated monomers, including at least 98% by weight of 4-tert-butylcatechol (4-TBC), 0.03% to 0.2% by weight of catechol (PC), and at least one impurity selected among 3-tert-butylcatechol, tert-butylhydroquinone, 3,5-di-tert-butylcatechol and mixture thereof, the total quantity of said impurities and of the PC being 0.1% to 0.8% by weight of said composition. The invention also describes a method for removing said polymerization-inhibiting composition present in a mixture including at least one ethylenically unsaturated monomer.

Composition preventing the polymerization of ethylenically unsaturated monomers and the removal thereof before polymerization

Novel onium borates of an element of Groups 15 to 17 of the Periodic Table, or borates of an organometallic complex of an element of Groups 4 to 10 of the Periodic Table, well suited for the photochemical/electron beam cationic initiation of polymerization/crosslinking, the anionic borate moiety of which having the formula:

Onium borates/borates of organometallic complexes and cationic

The present invention relates to an organopolysiloxane composition containing a cyclopentenyl radical and crosslinkable in a thin layer by exposure to ultraviolet light, characterized in that it comprises: A. 100 parts of diorganopolysiloxane containing at least 3 cyclopentenyl radicals per molecule, each of these groups being directly linked, by an SiC bond, to a different silicon atom, and B. an effective amount of at least one photoinitiator. Application of the compositions to the production of coatings, especially for the production of non-stick coatings on paper, and for the encapsulation of printed circuits.

Organopolysiloxane composition containing a cyclopentenyl radical and

Cationically crosslinkable polyorganosiloxane compositions, well suited for providing antiadhesive coatings on a wide variety of shaped substrates via the photochemical/electron beam crosslinking thereof, include a catalytically effective amount of an onium borate of an element of Groups 15 to 17 of the Periodic Table, the anionic borate moiety of which onium borate having the formula:

Cationically crosslinkable polyorganosiloxanes and antiadhesive coatings

Linear and cyclic diorganopolysiloxanes containing thioalkyl (meth)acrylate functional groups bonded via an SiC linkage to the polysiloxane backbone are crosslinkable under the influence of UV or an electron beam, and thus are well suited, e.g., for the sheathing of optical fibers.

Photocurable diorganopolysiloxanes containing thioalkyl (meth) acrylate

Organopolysiloxane compositions curable into elastomeric state, whether in single- or two-component form, comprise an .alpha.,.omega.-dihydroxypolydiorganopolysiloxane oil, a crosslinking agent therefor, optionally, inorganic fillers and an adhesion promoter, and a catalytically effective amount of a pentacoordinated tin monochelate produced by reacting a tin oxide with a .beta.-dicarbonyl compound and a carboxylic acid.

Tin monochelate catalysis of organopolysiloxane compositions

Peelable, laminated shaped articles well adapted as transfer adhesives useful, e.g., for the restoration of works of art, include (i) a flexible first substrate having a nonstick polyaddition cyclotrisoloxane/organopolysiloxane composition crosslinked from an organic solvent solution on at least one face surface thereof, (ii) a precured adhesive layer adhered onto the at least one nonstick silicone layer, wherein the adhesive comprises an organopolysiloxane devoid or organic peroxide and constituting the intercondensation product of an MQ resin with a phenylated resin having silanol end groups, and (iii) a second substrate adhered to the opposite face surface of the precured adhesive layer.

Laminated shaped article/silicone transfer adhesive

Aqueous silicone emulsions, especially useful for rendering a wide variety of substrates nonadhesive/water-repellent by polycondensation crosslinking, contain (a) an .alpha.,.omega.-dihydroxydiorganopolysiloxane, (b) an organohydropolysiloxane containing at least 3 hydrogen atoms bonded to silicon atoms per molecule, (c) a polyvinyl alcohol, (d) a nonionic emulsifying agent, and (e) a crosslinking catalytically effective amount of a monochelate of pentacoordinated tin of valency IV.

Aqueous silicone emulsions containing tin monochelate crosslinking

Substrates, e.g., silicon wafers, coated with a UV-curable organopolysiloxane composition including a crosslinking catalyst therefor (e.g., a platinum group metal compound) and an amount of a crosslinking inhibitor (e.g., an azodicarboxylate) which is effective at ambient temperature, but ineffective to prevent crosslinking on exposure of the composition to ultraviolet radiation, are well adapted for the imaging of negative intelligence patterns thereon.

Growing community of inventors

Villeurbanne, France

Jacques Cavezzan