Patent ID: 8987176
Filing Date: 2015-03-24
Classification: B29C,B29D,C10M,C10N,Y10T

Abstract:
1. A method for lubricating an article, comprising: applying a lubricating composition in the form of an oil-in-water emulsion, based on a polyorganosiloxane that can be polymerized and/or crosslinked by dehydrogeno-condensation, the composition comprising: (a) at least one reactive polyorganosiloxane (A) comprising at least two OH groups per molecule and having a dynamic viscosity of from 50 to 3×106 mPa·s, at 25° C.; wherein the reactive polyorganosiloxane (A) comprises an α,ω-dihydroxypolydimethylsiloxane, (b) at least one crosslinking agent (B) having, per molecule, at least three reactive units ═SiH; comprising crosslinking agents S1 or S2, wherein wherein, 0≦a≦10,000, 3≦b≦10,000, 1≦d≦10,000 0≦e≦10,000, (c) at least one organic polymer latex (C), selected from the group consisting of styrene/butyl acrylate/acrylic acid copolymers with the following weight ratios relative to total weight of copolymer: styrene monomer: from 25 to 55% by weight; butyl acrylate monomer: from 74.5 to 40% by weight; and acrylic acid monomer: from 0.5 to 5% by weight; (d) mica (D), wherein said mica has a particle size of less than 500 μm; (e) at least one surfactant (E); (f) at least one unreactive linear polyorganosiloxane oil (F) having a dynamic viscosity of around 50 to 100000 mPa·s at 25° C. and comprising a polydimethylsiloxane; (g) optionally, at least one additive (G) selected from the group consisting of a film-forming polymer thickening agent, a complementary lubricant, an antifriction agent, a coalescence agent, a wetting or dispersing agent, a mineral filler, an antifoam agent, a thickener, a stabilizer, an acidifying agent, a biocide and an antifungal agent; (h) optionally, at least one dehydrogeno-condensation catalyst; and (i) water, the amounts of surfactant and water being sufficient to obtain an oil-in-water emulsion and wherein the constituents (a) to (i), if present in the composition, are found in amounts comprising 1 to 30 parts by weight of constituent (a); 1 to 30 parts by weight of constituent (b); 0.1 to 10 parts by weight of constituent (c); 3 to 25 parts by weight of constituent (d); 0.5 to 10 parts by weight of constituent (e); up to 30 parts by weight of constituent (f); 0 to 30 parts by weight of constituent (g); 0 to 10 parts by weight of constituent (h); and 20 to 60 parts by weight of constituent (i), per 100 parts by weight of a sum of constituents (a) to (i) to said article, wherein said method is employed during the shaping and curing of a pneumatic or semi-pneumatic tire, for the lubrication of an inflatable rubber curing bladder.