DER0015671MA - - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

Registration date: December 24, 1954. Advertised on February 9, 1956

GERMAN PATENT OFFICE

The enzymatic mordants are mostly built up on the basis of pancreatic stryptase. the The disadvantage of such products which are excellent in terms of their pickling effect is that they often lead to leather with insufficient grain strength, also those formed by microorganisms Enzymes are used to pickle pelts, leaving leathers with a firm grain thus avoiding the disadvantage that occurs when using pancreatic stryptase will. When pickling with the proteolytic enzymes formed by bacteria and molds however, the removal of the ground or gneiss from the scar of the nakedness is insufficient. Also with a combination of both types of enzyme, namely the pancreatic trryptase on the one hand and the Mold and bacterial protease, on the other hand, address the shortcomings mentioned of both The pickling process does not resolve in a satisfactory manner. '

It has now been found that pelts can be removed with excellent protection of the scar with the aid of the proteolytic formed by microorganisms, i.e. by bacteria or or and by molds Enzymes, in a pp range between 6 and 9, can be pickled if the pelts

509 657/180

R 15671 IVc / '28a

before, during or after the pickling process with animal, vegetable, mineral or synthetic Oils are treated. The simultaneous use of pancreatic stryptase in suitable Quantities can be beneficial in some cases. With a view to the fact that during the pickling process the fatty substances, pigments and residues of the epidermis sitting in the pores of the skin loosened and - partly in the subsequent

to mechanical "processing - to be removed should, it must be described as surprising that a aimed at the removal of fatty substances Process is promoted precisely by adding fatty substances or oils. For yourself in the process according to the invention, the interpretation probably applies that the added oil penetrates into the pores and - regardless of the enzymatic action - the Makes pore-filling ground or gneiss slippery and therefore easy to slide. In the sense of this Explanation it is understandable that the additives promoting the basic solution before, during or after the action of the enzymatic mordant, but before the mechanical removal of the ground can be added to the pickling liquor.

For the purposes of the present invention, oils are intended to mean those products of vegetable, animal and mineral origin or synthetic origin, which are primarily based on their physical appearance Behavior act as a lubricant for the bottom sitting in the pores. These oils are in Water is difficult, mostly insoluble and liquid at the temperature chosen for the pickling process.

The treatment according to the invention can improve the desired effect in the presence known,) nonionic or cationic emulsifiers, such as ethylene oxide condensation products or quaternary ammonium bases or salts that do not damage the enzymes. These emulsifiers can also be used in combination with one another.

If one proceeds, as already described as possible, in such a way that the oils only after the end of the enzymatic Pickling process, but must be added to the liquor before mechanical processing - if emulsifiers are used at the same time. should be - for their compatibility with the Enzymes are not taken into account, d. H.

This type of procedure also requires the use of anionic emulsifiers or wetting agents, z. B. of fatty alcohol sulfonates, possible.

It can also be advantageous to first emulsify the oils in a manner known per se and to add them in this form to the enzymatic pickling liquor.

Example ι

Zickelblößen be at a p _H between 6

and 7 pickled with 300 ⁰ Zo water at 35 ⁰ C, 0.5 ⁰ Zo mold tryptase, 0.5 ⁰ Zo bacterial ^{protease, 10 0} Zo ammonium sulfate, 0.25 ⁰ Zo ¹ spindle oil raffinate, 0.25 ⁰ Zo water-soluble ethylene oxide condensation product.

When the stain is finished, it is smoothed, then fleshed and worked on as usual.

Example 2

Goat pelts are at a p _H between 6.5 and 7.5, stained with 300 Zo'Wasser ⁰ 34-36 ⁰ C, 2 to s ⁰ Zo sperm oil having a cold resistance of i ° C, 0.6 ⁰ Zo ammonium sulfate. After 30 minutes, 0.8 ⁰ zo of mold tryptase is added. After a total of 6 hours of pickling time, smoothing, fleshing and further work are carried out as usual.

Example 3

Beef pelts for vachettes are pickled at a p ^ between 7 and 8 with 300 ⁰ Zo water at 35 ° C, 0.6 ⁰ Zo bacterial protease, 0.6 ⁰ Zo ammonium sulfate, 0.5 ⁰ Zo rapeseed oil, 0.5 ⁰ Zo quaternary Ammonium salt, such as. B. dimethylbenzyl ammonium chloride. After 4 hours of pickling time, painting is carried out, then work continues as usual.

Example 4

Goat pelts are at a p _H 8-9 stained overnight with 300 ⁰ Zo water at 35 ° C, 0.6 ⁰ Zo Schimmelpilztryptase, 0.2 ⁰ Zo Pankreastryptase, 0.6 ⁰ Zo ammonium sulfate. The next morning this Bates is fulled with the addition of 1 ⁰ Zo Spindelölraffinat in barrel 1 hour, then fleshed and as further worked usual 10 ⁰ Zo.

Example 5

Lamb pelts are stained overnight with 8.5 300 ⁰ Zo of water at 35 ⁰ C, 0.5 ⁰ Zo Schimmelpilztryptase, 0.6 ⁰ Zo ammonium sulfate, 2.5 ° ZoKlauenölsulfonat at p _H.

Claims (1)

PATENT CLAIMS: ■ i. Process for pickling animal hide with the help of the proteolytic enzymes formed by microorganisms in a Pfj area between 6 and 9, characterized in that the pelts before, during or after Pickling process with water-insoluble, vegetable, animal, mineral or synthetic Oils are treated. ν 2. The method according to claim 1, characterized in that that pancreatic stryptase is also used. 3. The method according to claims 1 to 2, characterized in that known cationic and Z or non-ionic emulsifiers are also used will. 4. Process according to claims 1 to 3, characterized in that the pelts with Treated aqueous emulsions of water-insoluble vegetable, mineral or synthetic oils will. , Referred publications:
German Patent Nos. 605 961, 749 830, 847 947, 888 741. 509 657/180 1. 56