| abstract |
A hydraulic, lubricating and coupling composition which comprises an organopolysiloxane and, as an anti-wear agent, at least one compound of formulae (I) to (IV) :n nwherein each of R 1 to R 4 is independently hydrogen or a monovalent hydrocarbon group containing from 1 to 20 carbon atoms ; each of R 5 to R 7 is independently a divalent hydrocarbon group containing from 1 to 6 carbon atoms ; each of X 1 to X 4 is independently oxygen or sulfur ; each Y is independently a direct bond, oxygen or sulfur ; and n is an integer of from 0 to 2, with the proviso that both X 2 and X 3 are sulfur when n is 0 ;n nwherein R 1 to R 7 , X 1 to X 4 , Y and n are as defined in formula (I) ;n nwherein each of R 1 to R 4 is independently hydrogen or a monovalent hydrocarbon group containing from 1 to 20 carbon atoms ; each of R 5 to R 6 is independently a divalent hydrocarbon group containing from 1 to 6 carbon atoms ; each of X 1 to X 4 is independently oxygen or sulfur ; each Y is independently a direct bond, oxygen or sulfur ; and n is an integer of from 0 to 2 ;n nwherein each of R 1 and R 2 is independently hydrogen or a monovalent hydrocarbon group containing from 1 to 20 carbon atoms; R 8 is a hydrocarbon group containing from 1 to 20 carbon atoms and containing at least one esterbond ; each of X 1 and X 2 is independently oxygen or sulfur ; and each Y is independently a direct bond, oxygen or sulfur. |