abstract |
The present invention is characterized in that the acid value is improved by post-treatment with alkylene oxide in the process for preparing a phosphorus compound of Formula 1 below: [Formula 1] (In the above, R is an alkyl group of C 4 -C 10 , C 6 -C 20 Aryl group, C 6 -C 20 Alkyl substituted aryl group, CC 6 -C 20 aralkyl group, n is 0 or 1. |