Patent ID: 6825153
Filing Date: 2004-11-30
Classification: B29C,C08G,C08L,C10M,C10N

Abstract:
A lubricating composition, in the form of an oil-in-water emulsion, based on siloxane and not emitting hydrogen, comprising:a) a polydiorganosiloxane oil which is nonreactive to the lubricating properties, having a dynamic viscosity of the order of 5Ã—10âˆ’2 to 30Ã—10âˆ’2 Pa.s at 25Â° C. b) a polyorganosiloxane resin carrying, before emulsification, condensable hydroxyl substituents and comprising, before emulsification, at least two different siloxyl units selected from the group consisting of formula (RO)3SiO1/2(M); (RO)2SiO3/2(D); ROSiO3/4(T) and SiO4/2(Q), at least one of these units being a T or Q unit, in which formulae RO represents a monovalent organic substituent, the average number per molecule of organic radicals RO for a silicon atom being between 1 and 2; and said resin having a weight content of hydroxyl substituents of between 0.1 and 10% by weight; c) a crosslinking agent which is soluble in the silicone phase, comprising at least two functional groups capable of reacting with the polyorganosiloxane resin (b); d) a condensation catalyst capable of catalyzing the reaction of constituent (b) with constituent (c); e) a surfactant; and f) water, said composition comprising from 5 to 95 parts by weight of constituent (a); from 0.5 to 50 parts by weight of constituent (b); from 0.1 to 20 parts by weight of constituent (c); from 0.05 to 10 parts by weight of constituent (d); per 100 parts by weight of the sum of constituents (a)+(b)+(c)+(d); the quantities of surfactants and water being sufficient to obtain an oil-in-water emulsion.