摘要:
The invention relates to a crosslinkable composition X, comprising: at least one organopolysiloxane compound A comprising, per molecule, at least two C 2 -C 6 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(L 1 )2] in which: the symbol Fe represents iron at degree of oxidation II; the symbols L 1 , which may be identical or different, represent a ligand which is a β-dicarbonylato anion or the enolate anion of a β-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, characterized in that it consists in heating the composition X to a temperature of between 70 and 200°C, and to the resulting crosslinked silicone material Y.
摘要:
The invention relates to a crosslinked silicone material Y obtained by heating to a temperature of between 70 and 200°C, preferably between 80 and 150°C, and more preferably between 80 and 130°C, a crosslinkable composition X comprising: at least one organopolysiloxane compound A comprising, per molecule, at least two C 2 -C 6 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: [Ni (L 1 ) 2 ] in which: the symbol Ni represents nickel at degree of oxidation II; the symbols L 1 , which may be identical or different, represent a ligand which is a β-dicarbonylato anion or the enolate anion of a β-dicarbonylated compound; optionally at least one adhesion promoter D; and optionally at least one charge E. The invention also relates to a crosslinkable composition X, 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°C, and to the resulting crosslinked silicone material Y.
摘要:
The invention relates to a crosslinkable composition X, comprising: at least one organopolysiloxane compound A comprising, per molecule, at least two C 2 -C 6 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 (L 1 ) 2 ] in which: the symbol Co represents cobalt at degree of oxidation II; the symbols L 1 , which may be identical or different, represent a ligand which is a β-dicarbonylato anion or the enolate anion of a β-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, characterized in that it consists in heating the composition X to a temperature of between 70 and 200°C, and to the resulting crosslinked silicone material Y.
摘要:
The invention concerns compositions that can be cured in the presence of water or atmospheric moisture comprising at least one polyorganosiloxane having one or a plurality of condensable group(s) or hydrolysable and condensable group(s)and at least one compound capable of catalysing the condensation reaction of the condensable or hydrolysable and condensable groups of the polyorganosiloxane. This compound is a heterometallic complex of which the chemical formula comprises at least two different metal atoms M and M', M being an atom chosen from the group consisting of the atoms of columns 2 and 13 of the periodic table and M' being an atom chosen from the group consisting of the atoms of column 4 of the periodic table, and at least one alkoxide or chelating ligand.
摘要:
A precatalyst for the polymerization of α-olefins, having the formula FeuMalc vXw(LA)y(LB)z wherein: - Malc is an alkali metal and/or an alkaline-earth metal. - X is an anion; - LA is a Lewis acid; - LB is a Lewis base; - u is between 0.001 and 10; - v is an integer > 1; - w is between 1 and 20; - y is between 0 and 10; z is between 0 and 10.