EP 0204213 A1 19861210 - Method of retanning chrome-tanned leather.
Title (en)
Method of retanning chrome-tanned leather.
Title (de)
Verfahren zum Nachgerben von Chromledern.
Title (fr)
Procédé de retannage des cuirs tannés au chrome.
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).
Abstract (de)
Die vorliegende Erfindung betrifft ein Verfahren zum Nachgerben von Chromledern mit einem Gemisch, das im wesentlichen aus Cr(III)-Salzen, Dicarbonsäuren, Abstumpfmitteln und synthetischem Gerbstoff besteht.
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)
Citation (search report)
- [Y] FR 2271290 A1 19751212 - BAYER AG [DE]
- [YD] US 3888625 A 19750610 - DAWSON WILLIAM ORVAL
- [A] FR 2270328 A1 19751205 - DIAMOND SHAMROCK CORP [US]
- [A] FR 1238641 A 19600812 - NOPCO CHEM CO
- [T] LEDER, Band 37, Nr. 5, Mai 1986, Seiten 69-74, Darmstadt, DE; W. LUCK: "Chrom- und Chrom enthaltende Gerbstoffe"
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