ANTIFOAMS

摘要

Antifoams containing an organopolysiloxane and a solid dispersed in such organopolysiloxane are provided herein. The organopolysiloxane consists of units of the formula in which R is an alkyl radical having from 1 to 4 carbon atoms, n has an average value of from 0.5 to 1.4 and a viscosity of from 5 to 40 mm2.s-1 at 25.degree.C. The solid is present in an amount of from 0.1 to 30 percent by weight based on the weight of the organopolysiloxane. These antifoams are easy to prepare and are just as effective as the antifoams used heretofore. They are more stable for longer periods of time without any apparent separation. They can also easily be combined with organic materials which are used as emulsifiers, and are more readily dispersed in an aqueous system.