EP 0814168 B1 20001018 - Process for tanning of leather
Title (en)
Process for tanning of leather
Title (de)
Verfahren zur Gerbung von Leder
Title (fr)
Procédé de tannage du cuir
Publication
Application
Priority
DE 19624821 A 19960621
Abstract (en)
[origin: EP0814168A1] A tanning process comprises (1) treatment with a compound containing carbamoyl sulphonate groups and (2) treatment at a pH greater than 4 with a mineral tanning agent chosen from chromium (III), iron (II) or (III), aluminium (III), titanium (IV) or zirconium (IV) compounds, without the use of a pickling agent. The compound used in step (1) is a reaction product of the following components : (A) an organic polyisocyanate ; (B) 0.01-0.4 equivalents per isocyanate group in (A) of a polyether alcohol containing polyalkylene oxide groups, of which 40-100 mol.% are polyethylene oxide units with a sequence length of 5-70 (the equivalents are based on the hydroxyl groups in the alcohol) ; (C) optional further components which can react with isocyanate groups ; and (D) ammonium or alkali bi- or di-sulphites.
IPC 1-7
IPC 8 full level
C14C 3/04 (2006.01); C14C 3/18 (2006.01); C14C 3/28 (2006.01)
CPC (source: EP US)
Designated contracting state (EPC)
DE ES GB IT NL SE
DOCDB simple family (publication)
EP 0814168 A1 19971229; EP 0814168 B1 20001018; DE 19624821 A1 19980102; DE 59702486 D1 20001123; ES 2152594 T3 20010201; JP H1060499 A 19980303; US 5820634 A 19981013
DOCDB simple family (application)
EP 97109282 A 19970609; DE 19624821 A 19960621; DE 59702486 T 19970609; ES 97109282 T 19970609; JP 17514897 A 19970617; US 87738197 A 19970617