C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/5327
C08L 83/07 (2006.01) C08K 3/22 (2006.01) C08K 5/54 (2006.01) C08K 5/544 (2006.01) C08K 13/02 (2006.01)
Patent
CA 1337533
Compositions which can be crosslinked to form flame retardant and/or tracking resistant and arc resistant organo- polysiloxane elastomers which comprises adding to a cross- linkable organopolysiloxane an additive which is obtained by mixing (A) 60 to 80 percent by weight of diorgano- polysiloxane having 75 to 85 mol percent of dimethylsiloxane units and 15 to 25 mol percent of vinylmethylsiloxane units, (B) 20 to 35 percent by weight of a metal oxide selected from the group consisting of titanium dioxide, zirconium dioxide, zinc oxide, Ce(III) oxide and Ce(IV) oxide, (C) 0.05 to 0.25 percent by weight of plati- num, calculated as the element, (D) 1 to 5 percent by weight of an organo- silicon compound having basic nitrogen bonded via carbon to silicon in which the sum of the percentages (A) to (D) adds up to 100 percent by weight based on the total weight of the additive. In order to achieve tracking resistance and arc resistance, only titanium dioxide or zirconium dioxide are used, while any of the metal oxides can be used to achieve flame resistance. The additive is present in the composition in amounts of from 1 to 4 percent by weight, based on the total weight of the composition.
611660
Marsch Wilhelm
Wolfer Dietrich
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Wacker-Chemie G.m.b.h.
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