EP 0304677 B1 19910306 - TANNING METHOD WITH HIGH CHROME EXHAUSTION
Title (en)
TANNING METHOD WITH HIGH CHROME EXHAUSTION
Publication
Application
Priority
DE 3726796 A 19870812
Abstract (en)
[origin: EP0304677A1] The present invention relates to a process for the chrome tanning of pickled pelts with a reaction product of a basic chromium(III) sulphate and aliphatic dicarboxylic acids having 4 to 6 C atoms and/or salts thereof, the reaction product being prepared in aqueous solution from the basic chromium(III) sulphate and 0.2 to 0.8 mol of the aliphatic dicarboxylic acids per mol of chromium oxide of the basic chromium sulphate with subsequent adjustment of the theoretical basicity to 0 to 50% with the customary alkalis, and the reaction products being added to the pickling liquor as an aqueous solution having a chromium oxide content of at least 5% or in pulverulent form in an amount of 0.9 to 1.5% of chromium oxide (based on pelt weight), the liquor volume being less than 100% (based on pelt weight), the final pH being above 4.0 and the final temperature being above 40 DEG C.
IPC 1-7
IPC 8 full level
CPC (source: EP KR US)
C14C 3/06 (2013.01 - EP KR US)
Designated contracting state (EPC)
CH DE ES FR GB IT LI
DOCDB simple family (publication)
EP 0304677 A1 19890301; EP 0304677 B1 19910306; AU 2058788 A 19890216; AU 607525 B2 19910307; BR 8804055 A 19890307; DE 3726796 A1 19890223; DE 3861936 D1 19910411; DK 169080 B1 19940808; DK 450488 A 19890213; DK 450488 D0 19880811; ES 2021122 B3 19911016; JP H0814000 B2 19960214; JP S6466300 A 19890313; KR 890003960 A 19890419; KR 960010048 B1 19960725; MX 169356 B 19930630; NZ 225747 A 19900226; TR 23818 A 19900913; US 4919680 A 19900424; ZA 885914 B 19890530
DOCDB simple family (application)
EP 88112496 A 19880801; AU 2058788 A 19880808; BR 8804055 A 19880811; DE 3726796 A 19870812; DE 3861936 T 19880801; DK 450488 A 19880811; ES 88112496 T 19880801; JP 19811088 A 19880810; KR 880010287 A 19880812; MX 1255588 A 19880804; NZ 22574788 A 19880809; TR 59388 A 19880809; US 23123388 A 19880811; ZA 885914 A 19880811