Siloxane-based composition which is intended for tire molding/stripping

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.

2. An article coated by the method as claimed in claim 1 .

3. An article that can be obtained by heating an article as claimed in claim 2 .

4. An inflatable rubber bladder coated on an external surface thereof by a method as claimed in claim 1 , for the shaping and/or curing of pneumatic or semi-pneumatic tires.

5. An inflatable rubber that can be obtained by heating a bladder as claimed in claim 4 to a temperature of 80° C. to 180° C.

6. A green pneumatic or semi-pneumatic tire comprising an element that will constitute an external tread thereof intended to come into contact with the ground, said tire being coated on an internal surface thereof by a method as claimed in claim 1 .

7. A method as claimed in claim 1 , wherein the composition comprises:

3 to 15 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).

8. The method as claimed in claim 1 , wherein surfactant (E) is present in an amount of 0.5 to 7% by weight relative to the total weight of the emulsion.

9. The method as claimed in claim 1 , wherein at least one additive (G) is present.

10. The method as claimed in claim 1 , wherein additive (G) is present and comprises a biocide and a thickener.

11. The method as claimed in claim 1 , wherein the at least one dehydrogeno-condensation catalyst (h) is not present.

12. The method as claimed in claim 7 , containing 0 parts by weight of constitute (h).

13. The method as claimed in claim 1 , wherein at least one additive (G) is present, and the at least one dehydrogeno-condensation catalyst (h) is not present.

14. The method as claimed in claim 1 , wherein

0≦a≦8,000,

10≦b≦100,

20≦d≦60; and

0≦e≦1,000.

15. The method as claimed in claim 1 , wherein

0≦a≦5,000

30≦b≦55.