C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
402/16, 400/3010
C08L 83/04 (2006.01) C08F 283/12 (2006.01) C08G 77/442 (2006.01) C08L 57/00 (2006.01) C08L 83/10 (2006.01)
Patent
CA 1104744
ABSTRACT OF THE DISCLOSURE A modified organopolysiloxane composition is provided herein. Such organopolysiloxane composition is obtained from the polymerization of (1) a monomer having ethylenic unsaturation in the presence of (2) an organohy- drogenpolysiloxane fluid having a viscosity of from 10 to 1,000,000 centi- poise at 25°C., in which the organohydrogenpolysiloxane fluid is present in an amount of from 20 to 95 percent by weight based on the weight of mono- mer (1) and organohydrogenpolysiloxane (2) and (3) a free radical initiator to form a composition having in-situ generated particulate matter dispersed therein and having a polymeric organic group which is constituted of recur- ring units derived from monomer (1) grafted to the organohydrogenpolysiloxane (2). The composition contains in-situ generated particulate matter. The particulate matter results from the polymerization of monomer (1) in the presence of organohydrogenpolysiloxane (2) and free radical initiator (3), (b) a vinyl containing compound having at least two vinyl groups per molecule which is capable of crosslinking with (A) and (C) a catalyst capable of pro- moting the addition of silicon-bonded hydrogen groups to silicon-bonded vinyl groups. A process is also provided for preparing such composition, the process comprising reacting an organohydrogenpolysiloxane with an organic monomer in the presence of a free radical initiator at an elevated tempers- ture. The resultant composition may be combined with vinyl containing com- pounds having at least two vinyl groups per molecule and a catalyst which promotes addition of SiH groups to vinyl groups to form elastomers. These organopolysiloxane compositions have improved physical properties, e.g. the mixture is homogeneous, and the composition does not shrink on curing, thus making it essentially suitable for use as molding or potting compositions.
314537
Marcus & Associates
Sws Silicones Corporation
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