Dispersing agent composition for tanning of hides/skins and process for the preparation thereof

Patent metadata

Field	Value
Publication number	US-10280474-B2
Application number	US-201615539953-A
Country	US
Kind code	B2
Filing date	Jul 11, 2016
Priority date	Jul 13, 2015
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

Disclosed herein is a dispersing agent composition essentially comprising polyalkylene polyhydric compound, an organic acid and a non-ionic surfactant. The dispersing composition finds application in leather processing industry for tanning without adding any water or any other medium. It finds tremendous application potential in the tanning industry to ensure eco-benign leather processing that does not add to environmental pollution as no effluent is generated. The invention is therefore envisaged to play a crucial role in enhancing the economic and environmental benefits associated with tanning industry. The disclosure also relates to a process for preparing the composition and also the process of eco-benign tanning using the said composition.

First claim

I claim:

1. A dispersing agent composition for tanning of hides/skins without adding water or any other medium, wherein said composition comprises:
(a) 60-80 wt % of a polyalkylene polyhydric compound having carbon chain length in the range of C3 to C15 with high solubility in water, with transparent to translucent appearance;
(b) 5-25 wt % of an organic acid and
(c) 5-15 wt % of a non-ionic surfactant.

2. The composition as claimed in claim 1 , wherein said composition exhibits pH in the range of 1-4.

3. The composition as claimed in claim 1 , wherein the polyalkylene polyhydric compound is selected from the group consisting of sorbitol, mannitol, glycerol or their polymeric derivatives.

4. The composition as claimed in claim 1 , wherein the organic acid is selected from the group consisting of ethanoic acid, propionic acid and hydroxy propionic acid.

5. The composition as claimed in claim 1 , wherein the non-ionic surfactant is selected from the group consisting of poly ethylene glycol and poly propylene glycol.

6. A process for preparation of the dispersing agent composition as claimed in claim 1 , wherein the steps comprise mixing:
[i] 60-80 wt % of a polyalkylene polyhydric compound having carbon chain length in the range of C3 to C15 with high solubility in water, with transparent to translucent appearance;
[ii] 5-25 wt % of an organic acid; and
[iii] 5-15 wt % of a non-ionic surfactant;

for a period of 30 minutes to 2 hours to obtain the desired dispersing agent.

7. A tanning process for treatment of a delimed pelt comprising applying to said delimed pelt a mixture of the dispersing agent composition according to claim 1 and a tanning agent mixed in the ratio of 1:5 to 3:4 for a period of 3 to 10 hours to obtain the tanned hide/skin.

Assignees

• Council Scient Ind Res

Inventors

• Chellappa Muralidharan

Classifications

• C14C3/10

  Vegetable tanning · CPC title

• C14C3/02 Primary

  Chemical tanning · CPC title

• C14C3/22 Primary

  using polymerisation products · CPC title

• C14C3/06

  using chromium compounds · CPC title

• C14C3/08 Primary

  by organic agents · CPC title