| 摘要 |
PURPOSE:To obtain the subject composition excellent in viscosity stability, torque stability and siloxane gelation-preventing performance, and suitable as a viscous fluid for viscous coupling by adding a specific thiadiazole derivative and a phosphorus compound to a polyorganosiloxane having a specific viscosity. CONSTITUTION:This composition comprises (A) a polyorganosiloxane having a derivative comprising either of compounds of formula I and II each [R1, R2 number (un)saturated group (atom) composed of at least one of C, H, O, N and S, but either of R1 and R2 is a univalent group of Sx-R (R is the same as R1, R2; X is >=1], etc., in an amount of 0.05-0.15wt.% based on the whole weight of the composition, and (C) a phosphorus compound comprising either of compounds of formula III and IV (R<1>-R<3> are each H, a 1-20C hydrocarbon, but at least one of the R<1>-R<3> is a hydrocarbon group, etc.,), etc., in an amount of 0.1-0.3wt.% based on the whole weight of the composition. |
