초록

Aqueous diorganopolysiloxane emulsions containing dispersed inorganic silicates which have been treated with an organosilicon compound to impart hydrophobic properties thereto. The resultant dispersions may be employed as release agents especially in molding tires.

대표청구항 ▼

An aqueous emulsion containing a diorganopolysiloxane having a viscosity of at least 1000 cP at 25°C. and having mica dispersed therein which has a particle size of from 0.02 to 0.25 mm, said mica having been treated with an organosilicon compound selected from the class consisting of octamethylcycl

An aqueous emulsion containing a diorganopolysiloxane having a viscosity of at least 1000 cP at 25°C. and having mica dispersed therein which has a particle size of from 0.02 to 0.25 mm, said mica having been treated with an organosilicon compound selected from the class consisting of octamethylcyclotetrasiloxane, hydroxyl-terminated dimethylpolysiloxanes having from 2 to 12 siloxane units per molecule and silicon compounds having the formula (R3Si)aZ and Ra′SiZ′4-a′ in which R is selected from the class consisting of monovalent hydrocarbon radicals having from 1 to 18 carbon atoms and halogenated hydrocarbon radicals, Z and Z′are radicals selected from the class consisting of halogen, hydrogen, －OH, －OR′, －NR′X, －ONR′, －SR′, －OOCR′and when a is 2, then Z is also selected from the class consisting of －O－, 〓NX and －S－, R′is selected from the class consisting of a hydrocarbon radical and a substituted hydrocarbon radical, X is selected from the class consisting of hydrogen and R′, a is 1 or 2 and a′is 1, 2 or 3.