| 摘要 |
<p>An organic polyol ester of a polycarboxylic acid having formulae (Para) and/or (Meta) and/or (Ortho), wherein R6 is -(COOR1)x, or (I), R7 is H; or R6 and R7 together form (II); R1 and R2 are hydrogen or -OR1 and -OR2 together form an anhydride (-O-) bond; x is an integer of 0 or 1; Z is an integer ranging from 1 to the number of hydroxy groups on the polyol and D is a polyol residue. Also disclosed are processes for the preparation of these polyol esters, a tanning composition comprising a metallic salt and a polyol ester, and a method of tanning using said composition.</p> |
