US1706325A - Manufacture of synthetic tanning material free from mineral acid - Google Patents

Manufacture of synthetic tanning material free from mineral acid Download PDF

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Publication number
US1706325A
US1706325A US211630A US21163027A US1706325A US 1706325 A US1706325 A US 1706325A US 211630 A US211630 A US 211630A US 21163027 A US21163027 A US 21163027A US 1706325 A US1706325 A US 1706325A
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United States
Prior art keywords
acid
synthetic tanning
manufacture
tanning
mineral acid
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Expired - Lifetime
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US211630A
Inventor
Schafer Josef
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Novartis AG
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JR Geigy AG
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
    • C14C3/00—Tanning; Compositions for tanning
    • C14C3/02—Chemical tanning
    • C14C3/08—Chemical tanning by organic agents
    • C14C3/18—Chemical tanning by organic agents using polycondensation products or precursors thereof
    • C14C3/20—Chemical tanning by organic agents using polycondensation products or precursors thereof sulfonated

Definitions

  • the synthetic tanning materials hitherto known and in commercialuse are organic substances of highly complex molecular structure of strongly acid character, the sol- 5 ubility in water of which relies on the presence of sulpho groups. They are so strongly acid that the hide substance can easily be damaged. Thus it is for example possible to hydrolize completely hides by concentrated solutions of a condensation product from phenolsulphonic acids and formaldehyde. If such synthetic tanning substances are in the form of salts or if the acid products are transformed into their salts, they 1 do not show any useful tanning effect.
  • inoperative salts are capable of being restored again to tanning material if they are mixed with salts of hydrofluosilicic acid, which are entirely 2 harmless with respect to the hide substance.
  • One molecule of such a salt corresponds to and replaces herein two molecules of sulphuric acide or soda. If for example the neutralization of a tanning material obtained by condensation of phenolsulphonic acids with formaldehyde needs 106 parts of soda, 94 parts of fluosilicate of sodium or equivalent quantities of another salt of hydrofluosilicic acid are sufiicient to set free again the whole tanning substance, as experiments wit-h hide powder'have proved.
  • the described quantities of salts of hydrofiuosilicic acid may be sufiicient to set free the whole of the tanning substance, it may be advantageous in cases where in presence of acid reacting bodies an abundant deposition of tanning matter on the hide fibre is desired, to usean excess of fluosilicates or salts of hydrofiuosilicic acid without injuring the hide substance. There'is then produced silicic acid -which slightly tans the hide, and hydrofluoric acid which transforms the neutralized synthetic tanning material into an active tanning product.
  • a synthetic tanning'material obtainedfrom cresolsulphonic acid according to known methods is neutralized with soda and dried. 100 parts of the dry product are mixed with 50 parts of fiuosilicate of sodium. The mixture shows contents of tanning matter of 40 to per cent.
  • Goat-skin is introduced with 10Q per cent of water into the fulling tub and gradually mixed with 30 per cent (calculated on the skin) of the product obtained according to said Example 1.
  • the tanning operation necessitates 24hours, whereupon'the goods are washed, dried and worked up in the usual manner.
  • a synthetic tanning material obtained according to known methods from a mixture of equal parts of phenolsulphonic and naphtholsulphonic acids is neutralized by means of magnesia and dried. 100 parts of the dryproduct are mixed with 50 parts of fluosilicate of sodium. The mode of use is the same as above.
  • the'process may be carried out on synthetic tanning matters resulting from any aromatic oxysulphoacids, such as ordinary phenolsulphonic acid, cresolsulphonic acid, naptholsulphonic acid, etc., and formaldehyde, the solubility of which in water relies on the presence of sulpho groups in the molecule.
  • a process for the manufacture of synthetic tanning material free from mineral acid consisting in mixingsalts of synthetic tanning substances resulting from the condensation of aromatic oxysulphoacids and formaldehyde, the solubility of which in water relies on the presence of sulpho.
  • a process for the manufacture of synthetic tanning material free from mineral acid consisting in mixing salts of synthetic tanning substances resultin fromthe condensation of phenolsulphonlc acids and formaldehyde, the solubility of which in water relies on the presence of sulpho groups in the molecule, with salts of hydrofluosilicic acid.
  • the herein described synthetic tanning materials free from mineral acid, consisting in a mixture of a dr salt of a synthetic tanning substance resu ting from the condensation of aromatic oxysul ho acids and formaldehyde, the solubility 0 which in water relies on the presence of sulpho groups in the molecule, with a salt of hydrofiuosilicic acid.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)

Description

Patented Mar. 19, 1929.
HTED STATES T706325 PATENT OFFICE.
"JosEr scn irnn, or BASEL, swrrznnnann, ASSIGNOR TO I. n. GEIGY, s. a or 3am,
' SWITZERLAND, A FIRM.
MANUFACTURE OF SYNTHETIC TANNING MATERIAL FREE FROM MINERAL No Drawing. Application filed August 8, 1927, Serial No. 211,680, and in Germany August 16, 1926.
The synthetic tanning materials hitherto known and in commercialuse are organic substances of highly complex molecular structure of strongly acid character, the sol- 5 ubility in water of which relies on the presence of sulpho groups. They are so strongly acid that the hide substance can easily be damaged. Thus it is for example possible to hydrolize completely hides by concentrated solutions of a condensation product from phenolsulphonic acids and formaldehyde. If such synthetic tanning substances are in the form of salts or if the acid products are transformed into their salts, they 1 do not show any useful tanning effect.
Now I have found that such inoperative salts are capable of being restored again to tanning material if they are mixed with salts of hydrofluosilicic acid, which are entirely 2 harmless with respect to the hide substance. One molecule of such a salt corresponds to and replaces herein two molecules of sulphuric acide or soda. If for example the neutralization of a tanning material obtained by condensation of phenolsulphonic acids with formaldehyde needs 106 parts of soda, 94 parts of fluosilicate of sodium or equivalent quantities of another salt of hydrofluosilicic acid are sufiicient to set free again the whole tanning substance, as experiments wit-h hide powder'have proved. Although the described quantities of salts of hydrofiuosilicic acid may be sufiicient to set free the whole of the tanning substance, it may be advantageous in cases where in presence of acid reacting bodies an abundant deposition of tanning matter on the hide fibre is desired, to usean excess of fluosilicates or salts of hydrofiuosilicic acid without injuring the hide substance. There'is then produced silicic acid -which slightly tans the hide, and hydrofluoric acid which transforms the neutralized synthetic tanning material into an active tanning product.
The following examples illustrate the invention, the parts being-by weight:
1. A synthetic tanning'material obtainedfrom cresolsulphonic acid according to known methods is neutralized with soda and dried. 100 parts of the dry product are mixed with 50 parts of fiuosilicate of sodium. The mixture shows contents of tanning matter of 40 to per cent.
The mode of use of such product is as follows: Goat-skin is introduced with 10Q per cent of water into the fulling tub and gradually mixed with 30 per cent (calculated on the skin) of the product obtained according to said Example 1. The tanning operation necessitates 24hours, whereupon'the goods are washed, dried and worked up in the usual manner.
2. A synthetic tanning material obtained according to known methods from a mixture of equal parts of phenolsulphonic and naphtholsulphonic acids is neutralized by means of magnesia and dried. 100 parts of the dryproduct are mixed with 50 parts of fluosilicate of sodium. The mode of use is the same as above.
It may be noted that the'process may be carried out on synthetic tanning matters resulting from any aromatic oxysulphoacids, such as ordinary phenolsulphonic acid, cresolsulphonic acid, naptholsulphonic acid, etc., and formaldehyde, the solubility of which in water relies on the presence of sulpho groups in the molecule.
What I claim is:
' 1. A process for the manufacture of synthetic tanning material free from mineral acid, consisting in mixingsalts of synthetic tanning substances resulting from the condensation of aromatic oxysulphoacids and formaldehyde, the solubility of which in water relies on the presence of sulpho.
groups in the molecule, with salts of hydrofluosilicic acid.
2. A process for the manufacture of synthetic tanning material free from mineral acid, consisting in mixing salts of synthetic tanning substances resultin fromthe condensation of phenolsulphonlc acids and formaldehyde, the solubility of which in water relies on the presence of sulpho groups in the molecule, with salts of hydrofluosilicic acid.
3. As new articles of manufacture, the herein described synthetic tanning materials free from mineral acid, consisting in a mixture of a dr salt of a synthetic tanning substance resu ting from the condensation of aromatic oxysul ho acids and formaldehyde, the solubility 0 which in water relies on the presence of sulpho groups in the molecule, with a salt of hydrofiuosilicic acid.
In witnesswhereof I have hereunto signed my name this 28th day of July, 1927.
' JOSEF SGHAFER.
US211630A 1926-08-16 1927-08-08 Manufacture of synthetic tanning material free from mineral acid Expired - Lifetime US1706325A (en)

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DE1706325X 1926-08-16

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3990842A (en) * 1975-05-15 1976-11-09 Pennwalt Corporation Ammonium silicofluoride assisted dyeing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3990842A (en) * 1975-05-15 1976-11-09 Pennwalt Corporation Ammonium silicofluoride assisted dyeing

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