Patent EA-000252-B1 (EA)
Title: Particles of solid chemical compound, having antipyrene properties and method obtaining thereof
Inventor: MCLAUGHLIN JOHN R
IPC: C09D127/04
Filed: 1996-06-07
Abstract: 1. Finely divided particles of a solid chemical compound having flame retardant or smoke suppressant properties, said particles having a volumetric average particle size of less than 0.5 microns, and said particles being produced by comminution. 2. The finely divided particles of Claim 1, wherein at least 99% of said particles have sizes less than 1 micron. 3. The finely divided particles of Claim 1, wherein said solid chemical compound is selected from the group consisting of hydrated salts, organic phosphates, metal borates, polyamides, solid halogenated flame retardants with a melting point greater than 250 degree C, molybdenum compounds, metallocenes, antimony compounds, zinc compounds, and bismuth compounds. 4. The finely divided particles of Claim 1, wherein said solid chemical compound is selected from the group consisting of aluminum trihydrate, magnesium sulphate pentahydrate, magnesium hydroxide, hydrated magnesium carbonate, ammonium polyphosphate, melamine pyrophoaphate, barium metaborate, melamine, brominated polymers, ethylene bis-tetrabromophthalamide, decabromodiphenylethane, dodecachlorododecahydrodimetnanodibenzocyclooctene, molybdenum oxide, ammonium octamolybdate, ferrocene, antimony metal, antimony pentoxide, sodium antimonate, mixed metal oxide of zinc and magnesium, zinc sulfide and bismuth subcarbonate. 5. The finely divided particles of Claim l, wherein said solid chemical compound is zinc borate. 6. The finely divided particles of Claim 1, wherein said solid chemical compound is decabromodiphenyloxide. 7. The finely divided particles of Claim 1, wherein said solid chemical compound is antimony trioxide. 8. A dispersion comprising a fluid vehicle, a dispersion agent and the particles of Claim 1. 9. The dispersion of Claim 8, wherein said fluid vehicle is selected from the group consisting of organic liquids, polyvinyl chloride plasticizers and low melting point waxes or fats. 10. The dispersion of Claim 8, wherein said fluid vehicle is selected from the group consisting of dimethylacetamide, ethylene glycol and diisodecylphthalate. 11. The dispersion of Claim 8, wherein said fluid vehicle is water. 12. The dispersion of Claim 8, wherein said dispersion agent is selected from the group consisting of cationic surfactants, amphoteric surfactants, and non-ionic surfactants. 13. The dispersion of Claim 8, wherein said dispersion agent is selected from the group consisting of wetting agents and anionic surfactants. 14. A process for producing finely divided particles of a solid compound having flame retardant or smoke suppressant properties comprising: loading an agitated media mill with comminuting media, a fluid vehicle, and particles of a solid compound having flame retardant or smoke suppressant properties; and agitating said comminuting media, fluid vehicle, and particles until said particles are reduced in size by at least 10% and have a volumetric average particle size of less than 0.5 microns, wherein at least 99% of said particles is sized less than 1 micron. 15. The process of Claim 14 wherein said slurry further comprises a dispersion agent. 16. The process of Claim 14, wherein said agitated media mill is operated at a tip speed ranging from 1000 to 6000 feet per minute (304.8-1828.8 m/min). 17. The process of Claim 14, wherein said comminuting media are provided in an amount sufficient to fill about 80 to 92% of the bulk volume within said mill. 18. The process of Claim 14, wherein said comminuting media are selected from the group consisting of sand, glass beads, metals, and ceramics. 19. The process of Claim 18, wherein said comminuting media are selected from the group consisting of barium titanite, leaded soda lime, borosilicate, carbon steel, stainless steel, tungsten carbide, zirconium silicate, and alumina. 20. The process of Claim 19, wherein said media is yttrium stabilized zirconium oxide. 21. The process of Claim 14, wherein said solid chemical compound is selected from the group consisting of hydrated salts, organic phosphates, metal borates, polyamides, solid halogenated flame retardants with a melting point greater than 250 degree C, molybdenum compounds, metallocenes, antimony compounds, zinc compounds, and bismuth compounds. 22. The process of Claim 14, wherein said solid chemical compound is selected from the group consisting of zinc borate, decabromodiphenyloxide and antimony trioxide. 23. The process of Claim 14, wherein said fluid vehicle is selected from the group consisting of organic liquids, polyvinyl chloride plasticizers and low melting point waxes or fats. 24. The process of Claim 14, wherein said fluid vehicle is selected from the group consisting of dimechylacetamide, ethylene glycol and diisodecylphthalate. 25. The process of Claim 14, wherein said fluid vehicle is water. 26. The process of Claim 15, wherein said dispersion agent is selected from the group consisting of cacionic surfactants, amphoteric surfactants, and non-ionic surfactants. 27. The process of Claim 14, wherein said dispersion agent is selected from the group consisting of wetting agents and anionic surfactants. 28. The process of Claim 14, wherein said comminuting media has an average size ranging from about 0.012 to 0.2 mm. 29. The process of Claim 28 wherein said comminuting media is yttrium stabilized zirconium. 30. The method of Claim 29 wherein said comminuting media has an average diameter of about 0.2 mm. 31. Finely divided particles of a solid chemical compound having flame retardant or smoke suppressant properties, produced by the process of Claim 14. 32. A process for producing finely divided antimony trioxide comprising: loading an agitated media mill with ceramic comminuting media, a fluid vehicle, a dispersion agent and starting particles of antimony trioxide; and agitating said comminuting media, fluid vehicle, dispersion agent and antimony trioxide starting particles until said antimony trioxide starting particles are reduced in size by at least 10% and comminuted antinomy trioxide particles are produced within said agitated media mill having a size distribution wherein said comminuted antimony trioxide particles have a volumetric average particle size of less than 0.1 micron and wherein at least 99% of said comminuted antimony trioxide particles are sized less than 1 micron. 33. The process of Claim 32 wherein said dispersion agent is an anionic surfactant. 34. The process of Claim 32 wherein said fluid vehicle is water. 35. The process of Claim 32 wherein said ceramic comminuting media is yttrium stabilized zirconium oxide having an average diameter of about 0.2 mm. 36. Finely divided particles of antimony trioxide having a volumetric average particle size of less than 0.1 micron, at least 99% of said particles having sizes less than about 1 micron, said particles being produced by comminution and being dispersed in a fluid vehicle containing a dispersion agent. 37. The finely divided particles of Claim 36 wherein said dispersion agent is an anionic surfactant. 38. The finely divided particles of Claim 36 wherein said fluid vehicle is water. 39. A process for producing finely divided particles of a solid compound having flame retardant or smoke suppressant properties comprising: loading an agitated media mill with comminuting media, a fluid vehicle, and starting particles of a solid compound having flame retardant or smoke suppressant properties; and agitating said comminuting media, fluid vehicle, and starting particles until said starting particles are reduced in size by at least 10% and comminuted particles are produced within said agitated media mill having a size distribution wherein said comminuted particles have a volumetric average particle size of less than 0.25 micron and wherein at least 99% of said comminuted particles is sized less than 1 micron, wherein said size distribution is produced in a residence time of less than 15 minutes. 40. (Amended) A process for producing finely divided antimony trioxide comprising: loading an agitated media mill with ceramic comminuting media, a fluid vehicle, a dispersion agent and starting particles of antimony trioxide; and agitating said comminuting media, fluid vehicle, dispersion agent and antimony trioxide starting particles until said antimony trioxide starting particles are reduced in size by at least 10% and comminuted antinomy trioxide particles are produced within said agitated media mill having a size distribution wherein said comminuted antimony trioxide particles have a volumetric average particle size of less than 0.25 micron and wherein at least 99% of said comminuted antimony trioxide particles are sized less than 1 micron, wherein said size distribution is produced in a residence time of less than 15 minutes.