公开(公告)号：GB1067798A

公开(公告)日：1967-05-03

申请号：GB3829865

申请日：1965-09-08

Applicant: BASF AG

Inventor： MILLER FRANZ-FRIEDRICH ,  LIDLE HELMUT ,  LEPPMEIER FRANZ

IPC: C14C1/06

Abstract: Hides and skins are depilated in an aqueous medium with compounds (e.g. sodium chlorite) which split off chlorine dioxide in the presence of an acid, the acid used being one which does not tan or swell the hides. The hides may be immersed in a mixture of the solutions of the chlorine dioxide yielding substance and acid or in the solution of the chloride dioxide yielding substance or acid alone before the addition of the other. The pH of the treating composition may be raised to dissolve the damaged hair or the pH may be adjusted to allow the hides to be tanned. The acid may be produced in the treating medium by adding to the treating medium a salt which gives the desired acid on the addition of an acid or acid salt (e.g. sulphuric, phosphoric, acetic or trichloroacetic acid or potassium or sodium hydrogen sulphate). Suitable non-swelling acids are sulphuric and/or carboxylic acids of the benzene series containing hydroxy, amaino or nitro groups and/or halogen atoms and sulphuric acids of the napthalene series which contain the said substituents (long list of such acids given) and linear polyphosphoric acids.

公开(公告)号：FR1446704A

公开(公告)日：1966-07-22

申请号：FR30945

申请日：1965-09-09

Applicant: BASF AG

Inventor： MILLER FRANZ FRIEDRICH ,  LIDLE HELMUT ,  LEPPMEIER FRANZ

IPC: C14C1/06