| 摘要 |
Cyclic phosphates containing 2-hydroxybenzophenone residues are prepared by reacting monochloro cyclic phosphate esters with 2-hydroxybenzophenones or derived compounds which contain a second reactive hydroxyl group or by reacting dichlorophosphate esters in which the esterifying group is or contains a 2-hydroxybenzophenone residue with a dihydroxy compound wherein the hydroxyl groups are so positioned that a cyclic phosphate ester is formed. The cyclic phosphate esters are stabilizers for organic materials, especially polymers, against degradation by heat, light or oxidation. |
