C - Chemistry – Metallurgy – 08 – K
Patent
C - Chemistry, Metallurgy
08
K
400/4103, 400/51
C08K 5/54 (2006.01) C08L 83/04 (2006.01)
Patent
CA 1069240
ABSTRACT OF THE DISCLOSURE Highly transparent or optically clear elastomers are prepared by mixing (1) an organopolysiloxane having a viscosity of at least 500,000 cSt at 25°c.; (2) at least 0.02 percent by weight based on the weight of the organopolysiloxane (1) of a nitrogen-containing compound having at least one triorganosilyl group in which at least one nitrogen atom is linked directly to a silicon atom or via an oxygen atom, but no more than one con- densable group is linked to a silicon atom and which is selected from the class consisting of N-triorganosilylcarbamic acid esters, N-triorganosilyl- ureas, O-triorganosilyloxyamines, aminoorganosiloxanes and triorganosilyloxy- N-triorganosilylamines; (3) more than 4 to 40 percent by weight based on the weight of the organopolysiloxane (1) of a hexaorganodisilazane; and (4) from 10 to 150 percent by weight based on the weight of the organopolysiloxane (1) of silicon dioxide having a surface area of at least 50 m2/g. The resulting composition may be cured by the addition of a curing agent to form highly transparent or optically clear elastomers.
226213
Burkhardt Jurgen
Krohberger Herbert
Patzke Jorg
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