# US 5,710,309 A · Process for producing tris (tribromoneopentyl) phosphate

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- Number: US 5,710,309 A
- Document ID: US5710309A
- Status: Granted
- Kind: A
- Application number: 08/657,840
- Filed: 1996-05-31
- Granted: 1998-01-20
- Earliest claimed: 1995-06-08
- Assignees: Dai-Ichi Kogyo Seiyaku Co., Ltd.
- Inventors: Setsuo Nishibori; Hideaki Ohnishi
- Web page: https://patentgrep.com/patent/US5710309A

## CPC

- C07F 9/091: {with hydroxyalkyl compounds with further substituents on alkyl}
- C07F: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM (metal-containing porphyrins C07D487/22)

## Abstract

The invention relates to a process for producing tris(tribromoneopentyl) phosphate (TTBNPP), which is of value as a flame retardant. The process comprises reacting tribromoneopentyl alcohol with a phosphorus oxyhalide in the presence of anhydrous aluminum chloride as catalyst in an organic solvent to give tris(tribromoneopentyl) phosphate characterized in that a basic magnesium salt is added to the reaction mixture at the completion of the reaction. Compared with the conventional production technology, the process of the invention is conducive to high production safety and insures a high yield and a high recovery rate through a simplified procedure.

## Claims

### Claim 1

A process for producing tris(tribromoneopentyl) phosphate comprising reacting tribromoneopentyl alcohol with phosphorus oxyhalide in the presence of anhydrous aluminum chloride catalyst in an organic solvent characterized in that a basic magnesium salt is added to the reaction mixture at completion of the reaction.

### Claim 2 (depends on 1)

The process according to claim 1 wherein said basic magnesium salt is at least one member selected from the group consisting of magnesium oxide, magnesium hydroxide, magnesium carbonate, magnesium carbonate-magnesiumhydroxide, and their hydrates and is added in a proportion of 0.01-10 weight % relative to the theoretical yield of tris(tribromoneopentyl) phosphate.

### Claim 3 (depends on 2)

The process according to claim 2 further characterized in that addition of said basic magnesium salt is carried out at a temperature not causing precipitation of tris(tribromoneopentyl) phosphate from the reaction mixture.

### Claim 4 (depends on 3)

The process according to claim 3 further characterized in that water is added to the mixture obtained after addition of the basic magnesium salt.