| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain an ion-exchange resin catalyst which has a higher selectivity to bisphenols and a longer life time as compared to a conventional ion-exchange resin as a catalyst for preparing bisphenols from phenol compounds and ketones, and to provide a method for producing the ion-exchange resin catalyst. <P>SOLUTION: In the method for preparing bisphenols, the modified acidic ion-exchange resin in which at least one kind of cationic compound selected from the following (a), (b), (c) and (d) ionically binds to an acidic functional group, is used as a catalyst: (a) a quaternary phosphonium ion, (b) a quaternary ammonium ion, (c) a bis(phosphoranylidene) ammonium ion and (d) an N-substituted nitrogen-containing heterocyclic cation. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
