METHOD FOR TANNING SKINS OR MATERIALS CONTAINING COLLAGEN, WITH A DENSE FLUID UNDER PRESSURE

摘要

The invention concerns a method for tanning skins and materials containing collagen comprising the following successive steps: (a) contacting said skins or said materials containing collagen, in a chamber, with a dense fluid under pressure containing at least a tanning agent insoluble or hardly soluble in said dense pressurised fluid, but soluble in water; (b) bringing said chamber to atmospheric pressure so as to eliminate said fluid in gas form; then following step b), directly introducing into the chamber at least a basification agent; then pressurising the chamber again with said fluid; and carrying out step (c) which consists in contacting said skins or said materials containing collagen with the dense pressurised fluid containing said basification agent; and finally in a step (d) bringing the chamber back to atmospheric pressure so as to eliminate said fluid in gas form.