MANUFACTURING METHOD OF LEATHER OR LEATHER PRODUCT USING HEXAVALENT CHROMIUM TREATMENT AGENT AND LEATHER OR LEATHER PRODUCT USING HEXAVALENT CHROMIUM TREATMENT AGENT

摘要

PROBLEM TO BE SOLVED: To provide a manufacturing method of leather capable of treating the leather with a hexavalent chromium treatment agent without changing appearance during a manufacturing method of the leather.;SOLUTION: The manufacturing method of leather includes a chromium tanning process for conducting chromium tanning on skin to obtain leather and a finishing process for arranging a decorative layer containing a resin on a silver surface of the leather and further includes a reference amount determination process for determining a reference amount A of the hexavalent chromium treatment agent and a hexavalent chromium treatment process for applying the hexavalent chromium treatment agent containing the hexavalent chromium reduction compound at concentration a (mass%) with the amount of less than the reference amount A two or more times on a back surface of a silver surface of (i) finish treated leather for the lather finish treated in the finishing process or the like, where total applied amount is more than the reference amount A.;SELECTED DRAWING: None;COPYRIGHT: (C)2017,JPO&INPIT