MODIFIED FREE-ACID TYPE HETEROPOLYACID, MODIFIED HETEROPOLYACID SALT AND FREE-ACID TYPE HETEROPOLYACID-BASED POLYMER

摘要

PROBLEM TO BE SOLVED: To obtain a free-acid type heteropolyacid-based polymer usable as an acid catalyst to be readily recovered and reused.;SOLUTION: The modified free-acid type heteropolyacid represented by general formula (1) H_m[XY]-nH₂O (1) [X is a heteropolyanion in which a backbone constituent atom is partially deficient; Y is a metal group containing a reactive organic functional group; n is an integer of 1; m is an integer of 1 and is the absolute value of negative charge determined from [XY] in the general formula (1)] is homopolymerized or copolymerized to give the free-acid type heteropolyacid-based polymer.;COPYRIGHT: (C)2008,JPO&INPIT