US1628160A - Preparation and dyeing of leather - Google Patents

Description

Patented May 10, i927.

[UNITED STATES PATENT oFFicE;

creams-ensures LAMB, or BnnMonnsnY, LONDON, nuenmn.

PREPARATION AN!) DYEING F LEATHER.

No Drawing. Application filed June 9, 1925,3eria1 No. 36,052, and in Great Britain April 27, 1925.

This invention relates to the dyeing of leather and provides a treatment whicheffects the equaldistribution andsolubilization of the natural. grease inthe skins and enables them to be dyed a level shade of color and also gives greater penetration of the dyestuti' and enhancemen ot' the color produced.

According to this invention I treat the.

leather with a solution or emulsion of a .compound containing a naphthalene nucleus. The term is used in the generally accepted sense as representing a nucleus of the form containing from 8-to 16 hydrogen atoms. The leatheremployed may be tanned either by vegetable or mineral tanning agents or dressed by the oil or aldehyde process. it has been found that the. treatmentby the compound containing'the naphthalene nucleus applied either before or during the process of dyein etfects solubilizationof the natural andarti cial grease contained in the leather and'the leather is so modified that the dyestufi, penetrates more deeply than is usually the case and there i.; considerable increase in the intensity of shade produced. Various compounds of the type referred to can be uscdbut the compound preferred is hydrogenated naphthalene, used either alone 3 in a soluble or finely divisible form or in an emulsified form obtained by the employment of emulsifying agents, e. g, sodium, potassium or ammonium ricinoleate, hydrogenated phenol soaps-,hydrogenated cresol soaps, sul-' phonated or soluble oils of vegetable, animal or mineral origin, the salts of sulphonated aromatic acids, or aromatic acids either used alone or in conjunction with each other; or'

the employment of a mixture of an emulsion conjunction with halogen or other hydrocarbon compounds;

The method of treatment may be considerably varied and the following are four exa or solutionof hydrogenated naphthalene in East India tanned sheepskins and hides,

bark and sumach tanned calfskins, skivers,

genated naphthalene is added, and the goodstreated in the mixture for a period of about 15 minutes, when the requisite coal-tar dyestuti is then added and the treatment continued for a further period of minutes.

Ewample 2.

Vegetable tanned leathers, such' as enu merated above, are first thoroughl wetted out, when an addition is made to t 1e vessel of- 2 per cent to 3 per cent of a 90 per cent emulsion of hydrogenated naphthalene, and the goods processed for any desirable period. They are then washed and dyed with coaltar or natural dyestutl's by any of the common methods in use.

Example 3.

Ewample 4.

Ve etable, mineral tanned, or oil dressed or al ehyde leather is first wetted in water by any of the ordinary methods and is then treated with 2 per cent to 3\per cent'of an emulsion of per cent h drogenated naphthalene, 10 per cent hytl soap, and 10 per cent ordinary ammonia or potash soap, for a period of 30-minutes, when the dyein either by the a dition of the requisite coal- ,t. l p e of the treatment, /p py h h, tar or natural dyestufi' o the so ution, or by se arate treatment by any ordinary method.

t is to be understood thatthe term emulsion as used in the claims is intended to cover rogenated phenol process 1s proceeded with,

"W at I claim and desire to secure by Letters Patent of the United States is 1. lln the dyeing of leather, treating the leather with an emulsion of hydrogenated 5 naphthalene and with a dyeing agent.

2. ln the dyeing of leather, a process which consists in adding an emulsion of hydrogenated naphthalene to thedye bath.

3. lln the dyeing of leather, a process 10 which consists in employing an emulsion or a compound containing a naphthalene nuwearer) cleusin conjunction with coal-tar colouring matter and With a halogen hydrocarbon.

4 In the dyeing of leather, treating the leather With an emulsion of a compound containing 4 a naphthalene nucleus together with a soluble ricinoleate.

5. A process as in claim 4:, in which trichlorethylene is also employed with the aforesaid substances.

MORRIS CHARLES LAMB.