Abstract: The present invention concerns a lubricating composition which comprises:(A) 100 parts by weight of polyorganosiloxane having a viscosity of 50 cSt or more at 25.degree. C., wherein an organic group bonded to a silicon atom being a monovalent hydrocarbon group containing no aliphatic unsaturated bonding and(B) 0.01 to 7 parts by weight of polymethylsilsesquioxane powder having an average particle size of 0.05 to 50 .mu.m.Also, the present invention concerns a hydraulic fluid which comprises:(C) 100 parts by weight of polyorganosiloxane having a viscosity of 500 cSt or more at 25.degree. C., wherein an organic group bonded to a silicon atom being a methyl group or a phenyl group, and0.01 to 7 parts by weight of Component (B) as mentioned above.

Abstract: Disclosed is a method for preventing multiplication of algae which is characterized by coating the surfaces of solid materials with a silicone emulsion composition prepared by emulsion polymerization of:(1) 0.1 to 60% by weight of a reaction product prepared by reacting(A) 50 to 99.9% by weight of a polydiorganosilozane having more than one silanol group on the average in each molecule and having a viscosity of 5 to 10,000 cSt at 25.degree. C. with(B) 0.1 to 50% by weight of a product prepared by reacting (a) 1 mol of a compound represented by the formula: ##STR1## wherein Q.sup.1 is a monovalent group selected from the group consisting of a hydrogen atom, --CH.sub.3, --CH.sub.2 CH.sub.2 NH.sub.2 and --CH.sub.2 CH.sub.2 NHCH.sub.2 CH.sub.2 NH.sub.2, R.sup.1 is a divalent hydrocarbon group having 1 to 4 carbon atoms, R.sup.2 and R.sup.3 are monovalent hydrocarbon groups each having 1 to 4 carbon atoms, and a is an integer of 0 or 1,with (b) 0.5 to 3.

Abstract: A process for preventing odor in a polyoxyalkylene group-containing polyorganosiloxane comprising adding phytic acid to the polyoxyalkylene group-containing polyorganosiloxane during and/or after its production.

Abstract: A polishing agent composition containing a polyorganosiloxane preparation comprising:(A) from 4 to 40% by weight of a benzene soluble polyorganosiloxane resin comprising:(1) 70 to 100 mole percent (R.sup.1).sub.3 SiO.sub.1/2 units, and(2) 0 to 30 mole percent (R.sup.2).sub.2 SiO units and having Si bonded OR.sup.3 groups;(B) from 55 to 95% by weight of a liquid linear or branched polyorganosiloxane terminated by (HO)(R.sup.4).sub.2 SiO.sub.1/2 units or (R.sup.4).sub.3 SiO.sub.1/2 units, and whose units other than the terminal units comprise 90 to 100 mole percent (R.sup.5).sub.2 SiO units and 0 to 10 mole percent(R.sup.5).sub.a SiO.sub.