C - Chemistry – Metallurgy – 07 – F
Patent
C - Chemistry, Metallurgy
07
F
400/5346, 402/9,
C07F 7/18 (2006.01) C08F 283/12 (2006.01) C08L 43/04 (2006.01) C08L 83/04 (2006.01)
Patent
CA 1136640
ABSTRACT OF THE DISCLOSURE Modified organopolysiloxane compositions containing in situ genera- ted particulate matter and vulcanizable compositions containing them are pro- vided herein. The in situ generated particulate matter is capable of being cross-linked with an organosilicon compound having an average of more than two hydrogen atoms per molecule in the presence of a catalyst capable of pro- moting the addition of silicon bonded hydrogen to silicon bonded vinyl groups. The composition comprises vinyl-terminated organopolysiloxanes having a viscosity of from 10 to 10,000,000 centipoises at 25°C, which are free of hydrolyzable groups and having at least one polymeric organic group linked to the vinyl-terminated organopolysiloxanes through a carbon-to-carbon link- age in which the polymeric organic group is constituted of recurring units derived from at least one monomer having ethylenic unsaturation, the organic monomer is present in an amount of from 80 to 5 percent by weight and the vinyl terminated organopolysiloxanes are present in an amount of from 20 to 95 percent by weight based on the weight of the organic monomer and the vinyl-terminated organopolysiloxanes, the in situ generated particulate matter ranges from 10 to 500 microns in length and from 1 to 5 microns in diameter and is formed as a result of the free radical polymerization of at least one monomer having ethylenic unsaturation in the presence of the vinyl-terminated organopolysiloxanes. The composition may be cured to an elastomeric solid by combining the composition obtained from the polymerization with organo- silicon compounds having an average of more than two hydrogen atoms per molecule and a catalyst which promotes the addition of SiH groups to vinyl groups. These cured organopolysiloxanes have improved physical properties. They are useful in the preparation of elastomers, sealants, potting compounds, as coatings, and as molding compositions, especially where it is desired to keep shrinkage to a minimum.
324149
Marcus & Associates
Sws Silicones Corporation
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