Patent ID: 8101279

Claim:
A composition comprising: (a) at least one nonreactive linear polyorganosiloxane oil having lubricating properties, having a dynamic viscosity of the order of 5×10 −2 to 30×10 2 Pa·s at 25° C. and consisting of a linear polyorganosiloxane: consisting along each chain: of units of formula R 2 R 3 SiO 2/2 , combined with units of formula (R 2 ) 2 SiO 2/2 , or of units of formula (R 3 ) 2 SiO 2/2 , combined with units of formula (R 2 ) 2 SiO 2/2 , and blocked at each chain end with a unit of formula (R 2 ) 3 SiO 1/2 ; where the radicals R 2 and R 3 have the following definitions: the radicals R 2 , which are identical to or different from each other, are selected from the group consisting of methyl, ethyl, propyl and isopropyl radicals, the radicals R 3 , which are identical to or different from each other, are selected from the group consisting of phenyl, tolyl and benzyl radicals; and where at least 1%, in numerical terms, of the substituents R 2 and R 3 are phenyl, tolyl and/or benzyl radicals; (a′) at least one reactive linear polyorganosiloxane oil having at least two OH groups per molecule and having a dynamic viscosity ranging from 5×10 −2 to 200,000 Pa·s at 25° C.; (b) at least one polyorganosiloxane resin carrying condensable hydroxyl substituents and having at least two different siloxyl units selected from those of the formula (R 1 ) 3 SiO 1/2 (M); (R 1 ) 2 SiO 2/2 (D); R 1 SiO 3/2 (T) and SiO 4/2 (Q), at least one of said units being a T or Q unit, in which formulae R 1 represents a monovalent organic substituent, the average number per molecule of organic radicals R 1 for a silicon atom being between 1 and 2; (c) at least one crosslinking agent which is soluble in the silicone phase comprising at least two functional groups capable of reacting with the polyorganosiloxane resin (b); (d) at least one condensation catalyst capable of catalyzing the reaction of the constituent (b) with the constituent (c); (e) at least one surfactant; and (f) water, the quantities of surfactant(s) and of water being sufficient for producing an oil-in-water emulsion, the constituent (a)/constituent (a′) weight ratio being within the range from 2 to 5, and the constituents (a), (a′), (b) and (c) being mixed with each other before emulsification, said composition being in the form of an oil-in-water emulsion which does not emit hydrogen and said composition having a lower coefficient of friction and increased durability relative to a composition having an a/a′ ratio outside the claimed range.