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1. WO2020109799 - REVÊTEMENTS PROTECTEURS

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

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CLAIMS

1. A mixture curable in the presence of a suitable metallic catalyst to provide an intumescent coating material, wherein the mixture comprises:

a siloxane polymer;

a cross-linker for cross-linking the siloxane polymer;

filler, wherein the filler comprises char reinforcing filler; and an intumescent ingredient, wherein the intumescent ingredient comprises a phosphorus containing compound or a composition comprising a phosphorus containing compound, wherein the mixture comprises 5 to 20 % by weight of the phosphorus containing compound or composition comprising a phosphorus containing compound;

wherein the intumescent ingredient comprises 10 to 40 % by weight expandable graphite.

2. A mixture according to claim 1 , wherein the intumescent ingredient comprises 10 to 35 % by weight expandable graphite.

3. A mixture according to claims 1 or 2, wherein the phosphorus containing compound or composition comprising a phosphorus containing compound comprises ammonium polyphosphate.

4. A mixture according to any of the preceding claims, wherein the mixture comprises

6 to 25 % by weight of the char reinforcing filler.

5. A mixture according to any of the preceding claims, wherein the mixture comprises

7 to 20 % by weight of the char reinforcing filler.

6. A mixture according to any of the preceding claims, wherein the expandable graphite has a mean particle size about equal to or below 350 pm.

7. A mixture according to any of the preceding claims, wherein the expandable graphite has an onset of expansion temperature of 160 to 180°C.

8. A mixture according to any of the preceding claims, wherein the expandable graphite is a blend of two or more grades.

9. A mixture according to claim 8, wherein a first of the grades has a relatively low thermal expansion, and a second of the grades has a relatively high thermal expansion.

10. A mixture according to any of the preceding claims, wherein the mixture comprises polydialkylsiloxane which is unreactive with the siloxane polymer.

1 1. A mixture according to any of the preceding claims, wherein the siloxane polymer comprises polydiorganopolysiloxane.

12. A mixture according to claim 1 1 , wherein the polydiorganopolysiloxane comprises at least two condensable or hydrolyzable groups.

13. A mixture according to claim 12, wherein the at least two condensable or hydrolyzable groups comprise hydroxyl groups or alkoxy groups.

14. A mixture according to any of the preceding claims, wherein the suitable metallic catalyst comprises a metallic condensation catalyst.

15. A mixture according to claim 14, wherein the metallic condensation catalyst comprises a tin based condensation catalyst.

16. A mixture according to any of the preceding claims, wherein the filler comprises reinforcing and/or non-reinforcing filler.

17. A mixture according to any of the preceding claims, wherein the mixture comprises an adhesion promotor.

18. A mixture according to any of the preceding claims, wherein the mixture comprises a compatibilizer.

19. A method, the method comprising mixing:

a siloxane polymer;

a cross-linker for cross-linking the siloxane polymer;

filler, wherein the filler comprises char reinforcing filler; and an intumescent ingredient, wherein the intumescent ingredient comprises a phosphorus containing compound or a composition comprising a phosphorus containing compound, wherein the mixture comprises 5 to 20 % by weight of the phosphorus containing compound or composition comprising a phosphorus containing compound; wherein the intumescent ingredient comprises 10 to 40 % by weight expandable graphite;

the method further comprising allowing the mixture to cure in the presence of a suitable metallic catalyst to provide an intumescent coating material.

20. An intumescent coating material, wherein the intumescent coating material is the cured reaction product of a mixture comprising:

a siloxane polymer;

a cross-linker for cross-linking the siloxane polymer;

filler, wherein the filler comprises char reinforcing filler; and an intumescent ingredient, wherein the intumescent ingredient comprises a phosphorus containing compound or a composition comprising a phosphorus containing compound, wherein the mixture comprises 5 to 20 % by weight of the phosphorus containing compound or composition comprising a phosphorus containing compound;

wherein the intumescent ingredient comprises 10 to 40 % by weight expandable graphite.

21. An intumescent coating for protecting a substrate, the intumescent coating comprising an intumescent coating material, wherein the intumescent coating material is the cured reaction product of a mixture comprising:

a siloxane polymer;

a cross-linker for cross-linking the siloxane polymer;

filler, wherein the filler comprises char reinforcing filler; and

an intumescent ingredient, wherein the intumescent ingredient comprises a phosphorus containing compound or a composition comprising a phosphorus containing compound, wherein the mixture comprises 5 to 20 % by weight of the phosphorus containing compound or composition comprising a phosphorus containing compound;

wherein the intumescent ingredient comprises 10 to 40 % by weight expandable graphite.

22. An intumescent coating according to claim 21 , wherein the intumescent coating comprises a plurality of layers of the intumescent coating material.

23. A method of protecting a substrate, the method comprising:

coating the substrate with a mixture curable in the presence of a suitable metallic catalyst to provide an intumescent coating material, wherein the mixture comprises:

a siloxane polymer;

a cross4inker for cross4inking the siloxane polymer;

filler, wherein the filler comprises char reinforcing filler; and an intumescent ingredient, wherein the intumescent ingredient comprises a phosphorus containing compound or a composition comprising a phosphorus containing compound, wherein the mixture comprises 5 to 20 % by weight of the phosphorus containing compound or composition comprising a phosphorus containing compound;

wherein the intumescent ingredient comprises 10 to 40 % by weight expandable graphite;

the method further comprising allowing the mixture to cure in the presence of the suitable metallic catalyst to provide a protected substrate.

24. A method of protecting a substrate according to claim 23, wherein the method comprises providing the substrate with a plurality of layers of the intumescent coating material.

25. A protected substrate, the substrate comprising an intumescent coating comprising an intumescent coating material, wherein the intumescent coating material is the cured reaction product of a mixture comprising:

a siloxane polymer;

a cross-linker for cross-linking the siloxane polymer;

filler, wherein the filler comprises char reinforcing filler; and

an intumescent ingredient, wherein the intumescent ingredient comprises a phosphorus containing compound or a composition comprising a phosphorus containing compound, wherein the mixture comprises 5 to 20 % by weight of the phosphorus containing compound or composition comprising a phosphorus containing compound;

wherein the intumescent ingredient comprises 10 to 40 % by weight expandable graphite.