EP 0007555 B1 19811230 - APPLICATION OF WATER-INSOLUBLE ALUMINIUM SILICATES TO THE MANUFACTURE OF LEATHER
Title (en)
APPLICATION OF WATER-INSOLUBLE ALUMINIUM SILICATES TO THE MANUFACTURE OF LEATHER
Publication
Application
Priority
DE 2831846 A 19780720
Abstract (en)
[origin: US4264319A] In an improved process of tanning for the production of leather comprising subjecting pickled uncured hides to the action of an aqueous liquor containing (1) chemical tanning or pretanning agents and (2) auxiliary chemicals to tanning and recovering leather, the improvement consisting essentially of employing (i) a water-insoluble aluminosilicate, containing bound water, of the formula (Cat2/nO)x.Al2O3.(SiO2)y wherein Cat represents a cation selected from the group consisting of alkali metals, bivalent metal ions, trivalent metal ions, and mixtures thereof; n represents an integer of from 1 to 3; x is a number of from 0.5 to 1.8; and y is a number of from 0.8 to 50, said aluminosilicates having an average particle size in the range of from about 0.1 mu to 5 mm and a calcium binding power of from about 0 to 200 mg CaO/gm of anhydrous active substance measured at 22 DEG C. according to the Calcium Binding Power Test Method, and (ii) carboxylic acids having at least two carboxyl groups and containing ester groups and/or urethane groups and/or amide groups, said carboxylic acids having a molecular weight of from about 200 to 30,000 and being water-soluble or water-dispersible, as partial replacement of said chemical tanning or pretanning agents and said auxiliary chemicals to tanning.
IPC 1-7
IPC 8 full level
CPC (source: EP US)
Designated contracting state (EPC)
FR GB IT
DOCDB simple family (publication)
EP 0007555 A1 19800206; EP 0007555 B1 19811230; BR 7904607 A 19800325; DE 2831846 A1 19800207; JP S5516096 A 19800204; JP S6234800 B2 19870729; US 4264319 A 19810428
DOCDB simple family (application)
EP 79102490 A 19790717; BR 7904607 A 19790719; DE 2831846 A 19780720; JP 9105979 A 19790719; US 5635579 A 19790710