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US 2010/0078104 A1Published application
Siloxane-based lubricating compositions that release no hydrogen
OwnerStefan Breunig, Nadia Martininventors
Life of this patent
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Abstract
Lubricating compositions, in the form of oil-in-water emulsions, are based on a siloxane and do not release hydrogen and are particularly suited for the lubrication of internal surfaces of uncured or unvulcanized envelopes useful for the manufacture of rubber pneumatic or semi-pneumatic tires for vehicles, as well as for vulcanization bladders useful for the shaping and vulcanizing of pneumatic or semi-pneumatic tires.
Claims19
-18. (canceled)
A siloxane-based lubricating composition, formulated as an oil-in-water emulsion, which does not release hydrogen, comprising:
- (a) at least one non-reactive polydiorganosiloxane oil (A) having lubricating properties, having a dynamic viscosity on the order of 20 to 100,000 mPa·s at 25° C.;
- (b) at least one reactive linear polydiorganosiloxane oil (B) having per molecule at least two OH groups, said polydiorganosiloxane having a dynamic viscosity at 25° C. ranging from 50 to 50×106 mPa·s,
- (c) optionally, at least one polyorganosiloxane resin (C) which before emulsification carries condensable hydroxyl substituents and also which before emulsification contains at least two different siloxy units selected from among those of formulae)(R0)3SiO1/2 (M);
- (R0)2SiO2/2(D);
- R0SiO3/2 (T), and SiO4/2 (Q), at least one of these units being a T or Q unit, R0 in the formulae representing a monovalent organic substituent, the average number of organic radicals R0 per molecule for one silicon atom being 1 or 2;
- and said resin having a weight content of hydroxyl or alkoxy substituents ranging from 0.1% to 10% by weight,
- (d) at least one crosslinking agent (D) which is soluble in the silicone phase,
- (e) at least one water-soluble crosslinking agent (E), whose formula, in its monomeric form, is:
- (R2)(R1)N—Ra—Si(OH)3
- in which Ra is a C1-C20 alkylene radical, and R1 and R2 are independently a hydrogen atom or a C1-C6 alkyl radical, such crosslinking agent being capable of oligomerization by condensation of one or more silanol functions,
- (f) at least one surfactant (F),
- (g) water (K),
- (h) at least one film-forming polymer (G),
- (i) optionally, at least one thickener (H),
- (j) optionally, at least one wetting agent (I), and
- (k) optionally, at least one additive (J), with the proviso that:
- (1) the amounts of surfactant(s) and water are sufficient to provide an oil-in-water emulsion, and
- (2) said lubricating composition contains no metallic condensation catalyst.
15 more elements
Dependencies are inferred from the claim text.