| 摘要 |
<p>The invention relates to a process for preparing the 2'-hydroxydiphenyl-2-phosphinic acid in the form of a mixture with 6-hydroxy-(6H)-dibenzo(c, e) (1,2)-oxaphosphorine, said mixture being used in preparing copolycondensable fireproofing agents, for polyesther fibres. The process consists in the reaction of the o-phenylphenol with the phosphorus trichloride, directly, without isolating the intermediary compounds.</p> |
