Structured endothermic fire-retardant agents

Patent metadata

Field	Value
Publication number	US-2016200919-A1
Application number	US-201314913239-A
Country	US
Kind code	A1
Filing date	Aug 22, 2013
Priority date	Aug 22, 2013
Publication date	Jul 14, 2016
Grant date	—

Abstract

A fire-retardant composition includes a first reagent and a second reagent; the first reagent is isolated from the second reagent; and the first reagent and the second reagent are configured to react with each other endothermically.

First claim

1 . A fire-retardant composition comprising:
a microcapsule comprising a first reagent encapsulated with a first encapsulating material and a second reagent encapsulated with a second encapsulating material; the first reagent is isolated from the second reagent; and the first reagent and the second reagent are configured to react with each other endothermically; wherein the first encapsulating material comprises a thermally-sensitive material, wherein the thermally-sensitive material comprises an ethylene-vinyl alcohol co-polymer, neoprene, a chlorinated polyethylene, a chlorosulfonated polyethylene, a polyvinylidene chloride, a polyvinylidene chloride-methyl acrylate co-polymer, or a combination of any two or more thereof.

2 .- 3 . (canceled)

4 . The fire-retardant composition of claim 1 , wherein the microcapsule comprises a core comprising the first reagent and a shell comprising the second reagent.

5 .- 6 . (canceled)

7 . The fire-retardant composition of claim 1 , wherein the second encapsulating material comprises a thermally-sensitive material.

8 . (canceled)

9 . The fire-retardant composition of claim 7 , wherein the thermally-sensitive material comprises an ethylene-vinyl alcohol co-polymer, neoprene, a chlorinated polyethylene, a chlorosulfonated polyethylene, a polyvinylidene chloride, a polyvinylidene chloride-methyl acrylate co-polymer, or a combination of any two or more thereof.

10 . The fire-retardant composition of claim 1 , wherein the first encapsulating material and the second encapsulating material are configured to allow the first reagent to contact the second reagent upon heating.

11 . The fire-retardant composition of claim 1 , wherein the first reagent comprises urea, dimethyl urea, diethylurea, 1,3-dimethyl-1,3-diphenyl urea, 1,1-dimethyl urea, 1,3-dimethyl urea, 1,3-diphenyl urea, 1,3-bis(4-methylphenyl)urea, 1,3-bis(4-methoxyphenyl)urea, 1,3-bis(4-ethoxyphenyl)urea, or a combination of any two or more thereof.

12 . The fire-retardant composition of claim 1 , wherein the second reagent comprises ammonium chloride, ammonium hypophosphite, ammonium nitrate, ammonium sulfate, ammonium carbonate, ammonium bromide, ammonium iodide, or a combination of any two or more thereof.

13 . A fire-retardant composition comprising:
a polymer matrix; and a plurality of microcapsules of claim 1 dispersed in the polymer matrix.

14 . The fire-retardant composition of claim 13 , wherein the polymer matrix comprises a thermoset polymer, a thermoplastic polymer, or a combination of any two or more thereof.

15 . The fire-retardant composition of claim 13 , wherein the polymer matrix comprises polyethylene, polypropylene, poly(butylene terephthalate), poly(ethylene terephthalate), acrylonitrile-butadiene-styrene, high impact polystyrene, a rubber latex, silicone, nylon, or a combination of any two or more thereof.

16 . The fire-retardant composition of claim 13 , wherein the polymer matrix comprises high impact polystyrene.

17 . The fire-retardant composition of claim 13 , wherein the polymer matrix is present in the composition at a concentration of about 5 wt % to about 45 wt %.

18 . The fire-retardant composition of claim 13 , wherein the microcapsules have an average particle diameter of about 2 μm and about 10 μm.

19 . The fire-retardant composition of claim 13 , further comprising a filler, an additive, or both a filler and an additive.

20 . A process of making a fire-retardant composition, the process comprising:
coating a first reagent with a first encapsulant to form a first encapsulated reagent; coating a second reagent with a second encapsulant to form a second encapsulated reagent; and incorporating the first encapsulated reagent and the second encapsulated reagent into a microcapsule; wherein the first encapsulating material comprises a thermally-sensitive material, wherein the thermally-sensitive material comprises an ethylene-vinyl alcohol co-polymer, neoprene, a chlorinated polyethylene, a chlorosulfonated polyethylene, a polvvinylidene chloride, a polyvinylidene chloride-methyl acrylate co-polymer, or a combination of any two or more thereof.

21 . The process of claim 20 , further comprising dispersing a plurality of microcapsules in a polymer matrix.

22 . The process of claim 21 , further comprising extruding or molding the fire-retardant composition.

23 .- 27 . (canceled)

28 . The fire-retardant composition of claim 1 , wherein the microcapsule has an average particle diameter of about 1 μm and about 500 μm.

29 . The fire-retardant composition of claim 1 , wherein the microcapsule has an average particle diameter of about 2 μm and about 10 μm.

30 . The fire-retardant composition of claim 13 , further comprising an antioxidant, a UV absorber, a heat stabilizer, a light stabilizer, or a combination of any two or more thereof.

Assignees

• Empire Technology Dev Llc

Inventors

• Warner John
• Tang Pui-Ln
• Stewart Amie
• Kelly Colleen

Classifications

• C09D5/18 Primary

  Fireproof paints {including high temperature resistant paints} · CPC title

• C09K21/10

  containing nitrogen · CPC title

• C08L23/06

  Polyethylene · CPC title