Rhodia Chimie

Centre National De La Recherche Scientifique

Bluestar Silicones France Sas

Delphine Blanc-Magnard

Alain Pouchelon

Sébastien Sterin

Catherine George

Etienne Fleury

Gérard Mignani

Antoine Baceiredo

Christian Mirou

Jean-Paul Benayoun

Rémi Thiria

Fabio Zanandrea

Olivier Buisine

Single-component silicone elastomer compositions (SEA) are crosslinkable by polyaddition into self-adhesive state, contain at least one polyorganosiloxane (POS) including sites of ethylenic and/or acetylenic unsaturation {POS containing units &#x2550;Si&#x2014; [unsaturation]}; at least one polyorganosiloxane (POS) containing units &#x2550;Si&#x2014;H; a catalytic system including at least one metal catalyst and at least one crosslinking inhibitor; a filler; at least one adhesion promoter; optionally, at least one POS resin; optionally, at least one thermal resistance agent; and, optionally, at least one other functional additive, and are useful for gluing, assembling, sealing, e.g., joints, coatings, electrical, electronic and automobile engineering parts.

Single-component silicone elastomer compositions crosslinkable into self-adhesive state

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

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 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

The invention concerns a silicone composition crosslinkable into elastomer by hydrosilylation, in the presence of carbene-based metal catalysts. The invention aims at providing a composition of that type, stable over long periods at room temperature (one day to several months), without loss of its characteristic of being heat-curable by hydrosilylation and without generating secondary isomerization or coloring reactions. The invention is characterised in that the composition comprises: a polyorganovinylsiloxane(polydimethyl)(methylvinyl) siloxane; a polyorganohydrogenosiloxane; a platinum catalyst formed by a complex of formula C3 and optionally an acetylene crosslinking inhibitor, optionally a siliceous filler. The invention also concerns novel hydrosilylation catalysts of the metal complex type of formula C3 above. The life span of the potted single-constituent compositions of the invention is significantly increased 

Silicone composition crosslinkable into elastomer by hydrosilylation, in the presence of carbene-based metal catalysts, and catalysts

An &#x2261;SiH/&#x2261;SiOH silicone composition polymerizable/crosslinkable by dehydrogenating condensation in the presence of a catalyst judiciously selected to achieve at least one of the following: kinetics, concentration/efficiency ratio of the catalyst, cost, lowering of the catalyst activation temperature (room temperature), control of the release of gaseous hydrogen and the quality of the polymerized product and the crosslinked network, and finally limitation of the secondary reactions. This composition includes: Also disclosed is the catalyst &#x2014;C&#x2014; and processes which involve crosslinking of silicone by dehydrogenating condensation (non-stick coating on paper).

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Lyons, France

Delphine Blanc-Magnard