EP 0204213 B1 19880518 - METHOD OF RETANNING CHROME-TANNED LEATHER
Title (en)
METHOD OF RETANNING CHROME-TANNED LEATHER
Publication
Application
Priority
DE 3519287 A 19850530
Abstract (en)
[origin: ES8707767A1] The present invention relates to a process for the retanning (afterchroming) of chrome leathers. It has been found very high chromium exhaustion of the liquor can be achieved if the leather is retanned with mixtures of, (a) chromium (III) salts, (b) from 1.0 to 2.5 mol (per mole of Cr2O3 of the used chromium(III) salt) of aliphatic dicarboxylic acids having from 4 to 6 carbon atoms or aromatic dicarboxylic acids having from 8 to 12 carbon atoms and/or the salts thereof, (c) such a quantity of basifying agents, that a theoretical basicity of the used chromium(III) salt of from 80 to about 120% is established, and (d) from 150-250 g (per mol of Cr2O3 of the used chromium(III) salt) of one or more synthetic tanning agents (syntans).
IPC 1-7
IPC 8 full level
C14C 3/06 (2006.01); C14C 3/02 (2006.01); C14C 3/18 (2006.01); C14C 3/28 (2006.01)
CPC (source: EP US)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0204213 A1 19861210; EP 0204213 B1 19880518; CA 1275755 C 19901106; DE 3519287 A1 19861204; DE 3660208 D1 19880623; ES 555543 A0 19870816; ES 8707767 A1 19870816; JP H0531920 B2 19930513; JP S61278599 A 19861209; US 4834763 A 19890530; ZA 864008 B 19870128
DOCDB simple family (application)
EP 86106874 A 19860521; CA 510138 A 19860528; DE 3519287 A 19850530; DE 3660208 T 19860521; ES 555543 A 19860530; JP 11939286 A 19860526; US 18519888 A 19880422; ZA 864008 A 19860529