Neopentylglycol bis(diaryl phosphate) esters
Neopentyl glycol bis(diphenyl phosphate) liquid compositions are described that comprise from about 75% to about 90%, by weight, of neopentyl glycol bis(diphenyl phosphate), less than about 5% by weight of cyclic product, less than about 8% by weight of triphenyl phosphate, and with a P 3 content of no less than about 1%, by weight. These compositions are made by continuously adding neopentyl glycol to a diaryl chlorophosphate mixture at elevated temperature, under vacuum, and in the presence of a catalyst.
1. A neopentylglycol bis(diphenyl phosphate) liquid composition comprising from about 75% to about 90%, by weight, of neopentylglycol bis(diphenyl phosphate), less than about 5% by weight of cyclic product, less than about 8% by weight of triphenyl phosphate, and with a P 3 content of no less than about 1% by weight.
2. A method of making a neopentylglycol bis(diphenyl phosphate) composition as claimed in claim 1 by a semi-continuous process in which neopentyl glycol bis(diphenyl phosphate) is continuously added to a diaryl chlorophosphate mixture at elevated temperature.
3. A method to produce neopentylglycol bis(diphenyl phosphate) composition as claimed in claim 1 by a continuous process in which neopentyl glycol and the diphenyl chlorophosphate (DPCP) mix are continuously reacted at elevated temperature.
4. A composition according to claim 1 , wherein the P 3 content is no less than 3% by weight.
5. A process for forming a neopentylglycol bis(diphenyl phosphate) liquid composition as claimed in claim 1 comprising the continuous addition of neopentyl glycol to diphenyl chlorophosphate mix containing 90% or more of diphenyl chlorophosphate, 3% or less monophenyl dichlorophosphate and 5% or less triphenyl phosphate at elevated temperature, under vacuum, and in the presence of a catalyst.
6. A process for forming a neopentylglycol bis(diphenyl phosphate) liquid composition as claimed in claim 1 in which neopentyl glycol and a diphenyl chlorophosphate mix containing 90% or more of diphenyl chlorophosphate, 3% or less monophenyl dichlorophosphate and 5% or less triphenyl phosphate are continuously reacted at elevated temperature, under vacuum and in the presence of a catalyst.
7. A process according to claim 5 where the catalyst is a Lewis acid catalyst.
8. A process according to claim 2 where the elevated temperature is from about 120 to about 180° C.
9. A process according to claim 5 wherein the catalyst is magnesium chloride.
10. A process according to claim 3 where the elevated temperature is from about 120 to about 180° C.
11. A process according to claim 5 where the elevated temperature is from about 120 to about 180° C.
12. A process according to claim 6 where the elevated temperature is from about 120 to about 180° C.
13. A process according to claim 6 wherein the catalyst is magnesium chloride.
14. A process according to claim 7 wherein the catalyst is magnesium chloride.