# US 4,398,911 A · Tanning method

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- Number: US 4,398,911 A
- Document ID: US4398911A
- Status: Granted
- Kind: A
- Application number: 06/354,202
- Filed: 1982-03-03
- Granted: 1983-08-16
- Earliest claimed: 1979-07-26
- Assignees: Rohm Co., Ltd.
- Inventors: Max May; Rolf Monsheimer; Ernst Pfleiderer
- Web page: https://patentgrep.com/patent/US4398911A

## CPC

- C14C 3/00: Tanning; Compositions for tanning
- C14C 1/00: Chemical treatment prior to tanning
- C14C: CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING (bleaching of leather or furs D06L; dyeing of leather or furs D06P)

## Abstract

What is disclosed are improved methods for the preparation of leather wherein, in one or more steps for preparing leather from animal skins or hides, including beamhouse operations such as soaking, dehairing, opening of the hide structure, deliming, bating, pickling, and degreasing to prepare dehaired tannable hides from animal skins or hides, and including subsequent tanning, retanning, and dying steps performed on said tannable hides, a thickening agent is added to at least one of the treating baths involved in such method steps.

## Claims

### Claim 1

In a process for the preparation of leather from skins or hides, which process includes beamhouse method steps for the preparation of dehaired hides ready for tanning as well as the subsequent method steps of tanning and dressing said dehaired skins or hides, the improvement wherein a cellulose ether is added to the treating bath used in at least one of said method steps.

### Claim 2 (depends on 1)

A process as in claim 1 wherein said cellulose ether is added in an amount from 0.01 to 2 percent by weight of the total weight of the bath to which it is added.

### Claim 3 (depends on 1)

A process as in claim 1 wherein said cellulose ether is added in an amount from 0.03 to 1.2 percent by weight of the total weight of the bath to which it is added.

### Claim 4 (depends on 1)

A process as in claim 1 wherein said cellulose ether is added in an amount from 0.03 to 0.35 percent by weight of the total weight of the bath to which it is added.

### Claim 5 (depends on 1)

A process as in claim 1 wherein said cellulose ether is selected from the group consisting of methyl cellulose, hydroxyethyl cellulose, hydroxypropylmethyl cellulose, and hydroxybutylmethyl cellulose.