Protective coatings

Patent metadata

Field	Value
Publication number	US-2022002563-A1
Application number	US-201917296625-A
Country	US
Kind code	A1
Filing date	Nov 28, 2019
Priority date	Nov 30, 2018
Publication date	Jan 6, 2022
Grant date	—

Abstract

A mixture curable in the presence of a suitable metallic catalyst to provide an intumescent coating material. 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. The intumescent ingredient comprises a phosphorus containing compound or a composition comprising a phosphorus containing compound. The mixture comprises 5 to 20% by weight of the phosphorus containing compound or composition comprising a phosphorus containing compound. The intumescent ingredient comprises 10 to 40% by weight expandable graphite.

First claim

I/we claim:

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 claim 1 , wherein the phosphorus containing compound or composition comprising a phosphorus containing compound comprises ammonium polyphosphate.

4 . A mixture according to claim 1 , wherein the mixture comprises 6 to 25% by weight of the char reinforcing filler.

5 . A mixture according to claim 1 , wherein the mixture comprises 7 to 20% by weight of the char reinforcing filler.

6 . A mixture according to claim 1 , wherein the expandable graphite has a mean particle size about equal to or below 350 μm.

7 . A mixture according to claim 1 , wherein the expandable graphite has an onset of expansion temperature of 160 to 180° C.

8 . A mixture according to claim 1 , 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 claim 1 , wherein the mixture comprises polydialkylsiloxane which is unreactive with the siloxane polymer.

11 . A mixture according to claim 1 , wherein the siloxane polymer comprises polydiorganopolysiloxane.

12 . A mixture according to claim 11 , 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 claim 1 , 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 claim 1 , wherein the filler comprises reinforcing and/or non-reinforcing filler.

17 . A mixture according to claim 1 , wherein the mixture comprises an adhesion promotor.

18 . A mixture according to claim 1 , 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 - 25 . (canceled)

Assignees

• Advanced Insulation Ltd
• Dow Silicones Corp

Inventors

• Shepherd Simon Harry
• Jordan Laura Louise
• Naik Anil
• Dimitrova Tatiana
• Van Stiphoudt Anne-Marie

Classifications

• C09D7/61

  inorganic · CPC title

• C09D183/06

  containing silicon bound to oxygen-containing groups (C09D183/12 takes precedence) · CPC title

• C09D5/185 Primary

  Intumescent paints · CPC title

• C09D7/69

  Particle size larger than 1000 nm · CPC title

• C09D5/00 Primary

  Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced {(electrically insulating plastics, resins or waxes H01B3/30)}; Filling pastes · CPC title