Centre National De La Recherche Scientifique

Universite Claude Bernard – Lyon1

Elkem Silicones France Sas

Cpe Lyon Formation Continue Et Recherche-Cpe Lyon Fcr

Bostik Sa

Elken Silicones France Sas

Centre National De La Recherche Scientifique-Cnrs

Cpe Lyon

Jean Raynaud

Guillaume Michaud

Delphine Blanc

Vincent Monteil

Sébastien Marrot

Magali Bousquie

Delphine Crozet

Magali Puillet

Magali Bousquié

Federico Sanz

Frédéric Simon

Sébastien Norsic

Lionel Bosco

James Delorme

Raphaël Mirgalet

Magali BousquiÉ

The present invention relates to a method for producing a composition comprising at least one polyurethane with NCO end groups, and at least one catalyst B selected from among tertiary amines, said method comprising the following steps: a) production of a polyurethane with NCO end groups, comprising a step of polyaddition of a polyol composition and a polyisocyanate composition, in the presence of at least one catalyst A selected from the group consisting of—organo-metallic catalysts excluding tin-based catalysts, —tertiary amines, and—mixtures of same; and b) the addition of at least one catalyst B, selected from among tertiary amines, to the polyurethane with NCO end groups obtained in step a).

Method for producing a composition comprising a polyurethane with NCO end groups

The subject of the present invention is the use, as hydrosilylation and/or dehydrogenative silylation catalyst, of a cobalt compound of formula (1): [CO(N(SiR))]in which: &#x2014;the R symbols, which are identical or different, represent a hydrogen atom or a hydrocarbon-based radical having from 1 to 12 carbon atoms, and preferably the R symbols, which are identical or different, are chosen from the group consisting of: a hydrogen atom, alkyl groups having from 1 to 8 carbon atoms and aryl groups having from 6 to 12 carbon atoms, &#x2014;x=1, 2 or 3 and&#x2014;y=1 or 2.

Cobalt compound useful as catalyst for hydrosilylation, dehydrogenative silylation and crosslinking of silicone compositions

An object of the present invention is the use of iron compounds as hydrosilylation and dehydrogenative silylation catalysts.

Iron compound useful as hydrosilylation, dehydrogenative silylation and crosslinking catalyst for silicone compositions

A precatalyst for the polymerization of &#x3b1;-olefins, having the formula FeMX(LA)(LB)wherein:

Iron-based precatalyst and its use in the polymerization of &#x3b1;-olefins

The invention relates to a crosslinkable composition X, comprising: at least one organopolysiloxane compound A comprising, per molecule, at least two C2-C6 alkenyl radicals bonded to silicon atoms; at least one organohydrogenopolysiloxane compound B comprising, per molecule, at least two hydrogen atoms bonded to an identical or different silicon atom; at least one catalyst C which is a complex corresponding to the following formula: [Fe(L1)2] in which: the symbol Fe represents iron at degree of oxidation II; the symbols L1, which may be identical or different, represent a ligand which is a &#x3b2;-dicarbonylato anion or the enolate anion of a &#x3b2;-dicarbonylated compound; optionally at least one adhesion promoter D; and optionally at least one charge E. The invention also relates to the use of the previously described catalyst C as silicone composition crosslinking catalyst, to a silicone composition crosslinking method, wherein it comprises heating the composition X to a temperature of between 70 and 200&#xb0; C., and to the resulting crosslinked silicone material Y.

Silicone composition crosslinking catalysts

The invention relates to a crosslinkable composition X, comprising: at least one organopolysiloxane compound A comprising, per molecule, at least two C2-C6 alkenyl radicals bonded to silicon atoms; at least one organohydrogenopolysiloxane compound B comprising, per molecule, at least two hydrogen atoms bonded to an identical or different silicon atom; at least one catalyst C which is a complex corresponding to the following formula: [Co (L1)2] in which: the symbol Co represents cobalt at degree of oxidation II; the symbols L1, which may be identical or different, represent a ligand which is a &#x3b2;-dicarbonylato anion or the enolate anion of a &#x3b2;-dicarbonylated compound; optionally at least one adhesion promoter D; and optionally at least one filler E. The invention also relates to the use of the previously described catalyst C as silicone composition crosslinking catalyst, to a silicone composition crosslinking method, characterized in that it consists in heating the composition X to a temperature of between 70 and 200&#xb0; C., and to the resulting crosslinked silicone material Y.

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Villeurbanne, France

Jean Raynaud