US2112508A - Process of treating hides and skins - Google Patents

Description

Patented Mar. 29, 1938 UNITED STATES 2,112,508 PROCESS OF TREATING HIDES AND SKINS Christoph Thomsen,

Alfred Eckelmann, and

Ernst Koch,'Frankfort-on-the-Main, Germany, assignors to I. G. Farbenindustrie Aktiengee sellschaft, Frankfort-on-the-Main, Germany N Drawins. Original 1935, Serial No. 54,944. plication May 19, 1937, Serial No. 143,620.

application December 17, Divided and this air;

Germany December 22, 1934 '4 Claims.

The present invention relates to a process of treating hides and skins.

This application is a division of application Ser. No. 54,944, filed December 1'7, 1935, in the name of Christoph Thomsen et al.

We have found that hides and skins are improved by a treatment with basic compounds containing nitrogen and having a straight or branched, saturated or unsaturated carbon chain of at least 5 carbon atoms, or a cycloaliphatic ring containing at least 5 members, in the form of their addition salts. The carbon chain may be interrupted by other atoms or atom groups such as, for instance, by O, S, N, C0, CONE, butat least 5 carbon atoms must directly be connected with each other. The substitution products and derivatives of these bodies may also be used.

As such compounds there may, for instance,

be named: primary, secondary and tertiary amines, amino-oxides, imidazoles, imidazolines,

pyrimidines; furthermore imido-ethers, imidothioethers and amidines, the last three obtainable, for instance, according to the copending applications Ser. Nos. 751,252 and 751,253, filed November 2,1934, in the name of Alfred Eckelmann and Ernst. Koch, furthermore substituted ureas, thioureas, guanidines and carbaminic acid esters.

There may be used, for instance, the addition salts of the following bodies: octylamine, dodecylamine, stearylamine, the technical fatty amines such as, for instance, mixtures of amines prepared from coco-nut oil fatty acid, palm nut oil fatty acid or from technical stearic acid, the

amines made from technical montanic acid or naphthenic acid, abietylamine, para-octylaniline monomethvl-stearylamine, octylglucamine, monooleylhydron-propylene-diamine, stearoyldiethyl ethylenediamine, decylhexahydrophen- 4o ylamine, N-octylaniline, N-stearyl-para-phenylene-diamine, N-dodecylnaphthylamine, dodecylfurfurylamine, dimethyldodecylamine, dodecylmethylglimamine, asymmetric ethyloctylethylenediamine, N-dioctylaniline, dimethyldo- 45 decylamine oxide; furthermore N-methylstearbenzimidazole, N-dodecylacetbenzimidazole, N- stearoylhydroxy-ethylacetbenzimidazole, laurimidazoline, N-dodecylpyrimidine, stearimidomethylether, laurimidobutylether, the imidoisobutylether of coconut oil fatty acid, benzimldodecylether, acetimidostearylether, stearimidomethylthioether, stearamidine, the amidine of palm nut oil fatty acid, symmetrical and asymmetrical steardiethylamidine, steardiethylaminoethylamidine, stearethylamidine, monostearylurea, asymmetrical dodecylaminoethylurea, asymmetrical decylmethylolurea, N-stearyl-N'- diethylaminoethylurea, dodecylthiourea, symmetrical dioctylguanidine, diethylaminoethylcarbam'inic acid stearylester, N-dodecylpiperidine, beta-stearylaminopyridine. As salts there may be used, for instance, the chlorides, sulfates, formates or acetates of these bodies.

There may also be used the mixtures of these products with each other or with other products, for instance: mixtures of stearimidometbyl ether hydrochloride and stearamidine hydrochloride or stearimidazoline hydrochloride, or mixtures of dodecylurea with steardiethylamidine hydrochloride, of stearic acid diethylamide with stearamidine hydrochloride.

Insofar as these bodies are liquid, they may be used without application of solvents, otherwise they may suitably be used in the-form of an aqueous solution, or in case they are not sumciently soluble in water in the form of an emulsion. If necessary, they may be applied in conjunction with organic solvents, oils and the like or with dispersing agents.

The said products are well absorbed by hides and skins. They may be applied before or during the tanning process. The leathers and furs .which have been prepared from hides and skins either pre-treated with the said products or in the presence of the said products, have an agreeable soft feel. The tanning process takes place more uniformly and more rapidly. The products,

furthermore, prevent in many cases deleterious influences on the flber, and, with the aid of these products, there may be obtained leathers of very good resistance to tearing. Since many of these products are fast to light, they may be used with orhides thus treatedmayagainveryeasilybe soaked, if necessary, with addition of other soaking mnts.

The following examples serve to illustrate the invention, but they are not intended to limit it thereto; the parts are by weight:

(1) 100 parts of goat skin are shaken for 20 hours with a solution of 20 parts of diethylaminoethylcarbaminic acid stearyl ester hydorchloride in 300 parts of water; 9 parts of a formaldehyde solution of 30 per cent. strength are then added and shaking is continued for a further day. A feebly yellow, somewhat fatty leather of very good resistance to testing is obtained.

I (2) 80 parts of calf-skin are first pre treated with a solution of 8.5 parts of steardiethylamidine hydrochloride and 3.5 parts of dodecyi urea in 250 parts of water. Subsequently, 3 parts of acetaldehyde are added to this liquor and the sun is then after-drummed for a short time. A soft, feebly yellow leather of very good resistance to tearing is obtained.

We claim: y

l. The process which comprises treating untanned hides and skins with the salts of basic compounds having the general formula:

Nan,

wherein X stands for ORsNRaR-a, Y stands for O, S,NH,NR4; R,R1,Ra,Ra,R4being members of the group consisting of hydrogen, aliphatic radicals with a straight chain, aliphatic radicals with a branched'chain and radicals having a cycloaliphatic ring, at least one of the substituent radicalsinsaidbasiccompoundhavingatleast5 caflaon atoms.

2. The process which comprises treating untanned hides and skins with the salts of carbaminic esters of the general formula: Y v

' NBBi R0 wherein R, R1, R0 stand for members of the group consisting of hydrogen, aliphatic radicals with a straight chain, aliphatic, radicals with a branched chain and radicals having a cycloaliphatic ring. at least one of them having at least carbon atoms.

3. The process which comprises treating untanned hides and skins with diethyiaminoethyl,--

wherein x stands for ORs, NRaR-a', Y stands for Eli-N81 KOCH.