DOPO derivative flame retardants
The present invention relates to novel, halogen-free flame retardant derived from 9,10-Dihydro-9-Oxa-10-Phosphaphenantrene-10-oxide (DOPO). This invention also relates to the use of the halogen free DOPO derived flame retardant in polymers.
1. A compound having the following structure:
2. A composition comprising the compound of claim 1 , wherein said composition has an unreacted DOPO concentration of less than about 50,000 ppm.
3. A composition comprising the compound of claim 1 , wherein said composition has a solvent concentration less than about 1,000 ppm.
4. A composition comprising the compound of claim 1 , wherein the amount of said compound in the composition is greater than about 95 wt %.
5. A composition comprising the compound of claim 1 , wherein said composition has a 5% TGA weight loss at a temperature of greater than about 245° C.
6. A composition comprising the compound of claim 1 , wherein said composition has a total chlorine or bromine concentration less than about 1000 ppm.
7. A process for preparing the compound of Formula I:
comprising reacting a compound of Formula A
with dihaloethane in the presence of a base said base is potassium methoxide, sodium methoxide, lithium methoxide, potassium ethoxide, sodium ethoxide, lithium ethoxide, potassium t-butoxide, sodium t-butoxide, or mixtures thereof.