EP0349892B1 - Tanning method presenting a high chrome exhaustion of the tanning bath - Google Patents
Tanning method presenting a high chrome exhaustion of the tanning bath Download PDFInfo
- Publication number
- EP0349892B1 EP0349892B1 EP89111743A EP89111743A EP0349892B1 EP 0349892 B1 EP0349892 B1 EP 0349892B1 EP 89111743 A EP89111743 A EP 89111743A EP 89111743 A EP89111743 A EP 89111743A EP 0349892 B1 EP0349892 B1 EP 0349892B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tanning
- weight
- chromium
- aldehyde
- acid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims description 24
- 238000000034 method Methods 0.000 title claims description 22
- -1 alkali metal bicarbonates Chemical class 0.000 claims description 10
- HHLFWLYXYJOTON-UHFFFAOYSA-N glyoxylic acid Chemical compound OC(=O)C=O HHLFWLYXYJOTON-UHFFFAOYSA-N 0.000 claims description 8
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 150000001299 aldehydes Chemical class 0.000 claims description 6
- 150000004715 keto acids Chemical class 0.000 claims description 6
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 5
- 239000000395 magnesium oxide Substances 0.000 claims description 5
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 5
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 4
- 235000019253 formic acid Nutrition 0.000 claims description 4
- 229910052783 alkali metal Inorganic materials 0.000 claims description 3
- 229910000288 alkali metal carbonate Inorganic materials 0.000 claims description 2
- 150000008041 alkali metal carbonates Chemical class 0.000 claims description 2
- 229910000514 dolomite Inorganic materials 0.000 claims description 2
- 239000010459 dolomite Substances 0.000 claims description 2
- 239000002610 basifying agent Substances 0.000 claims 3
- 150000001340 alkali metals Chemical class 0.000 claims 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims 1
- 235000012211 aluminium silicate Nutrition 0.000 claims 1
- 229910000323 aluminium silicate Inorganic materials 0.000 claims 1
- BFGKITSFLPAWGI-UHFFFAOYSA-N chromium(3+) Chemical class [Cr+3] BFGKITSFLPAWGI-UHFFFAOYSA-N 0.000 claims 1
- 238000000605 extraction Methods 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 235000012217 sodium aluminium silicate Nutrition 0.000 claims 1
- 229910052804 chromium Inorganic materials 0.000 description 15
- 239000011651 chromium Substances 0.000 description 15
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 8
- 150000003839 salts Chemical class 0.000 description 6
- 239000003513 alkali Substances 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 5
- 241000283707 Capra Species 0.000 description 4
- 235000015278 beef Nutrition 0.000 description 4
- 239000002585 base Substances 0.000 description 3
- 239000010985 leather Substances 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- LCTONWCANYUPML-UHFFFAOYSA-N Pyruvic acid Chemical compound CC(=O)C(O)=O LCTONWCANYUPML-UHFFFAOYSA-N 0.000 description 2
- 206010000496 acne Diseases 0.000 description 2
- 150000001991 dicarboxylic acids Chemical class 0.000 description 2
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 2
- 241001494479 Pecora Species 0.000 description 1
- 229920013631 Sulfar Polymers 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- WDNIVTZNAPEMHF-UHFFFAOYSA-N acetic acid;chromium Chemical compound [Cr].CC(O)=O.CC(O)=O WDNIVTZNAPEMHF-UHFFFAOYSA-N 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 235000010633 broth Nutrition 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 150000001844 chromium Chemical class 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 210000004197 pelvis Anatomy 0.000 description 1
- 235000015277 pork Nutrition 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 229940107700 pyruvic acid Drugs 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 231100000241 scar Toxicity 0.000 description 1
- 230000036555 skin type Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229920001864 tannin Polymers 0.000 description 1
- 239000001648 tannin Substances 0.000 description 1
- 235000018553 tannin Nutrition 0.000 description 1
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
- C14C3/04—Mineral tanning
- C14C3/06—Mineral tanning using chromium compounds
Definitions
- the invention relates to a chrome tanning process with which complete tanning is achieved and with which the chrome broths are practically completely exhausted.
- the object of the invention was therefore to develop a chrome tanning process with which an even higher exhaustion of the tanning liquors is achieved in comparison with the known processes.
- the invention is based on the surprising finding that the degree of exhaustion of tanning liquors is substantially improved if the tanning liquor is pre-dulled with basic agents in the presence of aldehyde and / or keto acids.
- the invention accordingly relates to a process for chrome tanning with a high chromium exhaustion of the tanning liquors, which is characterized in that pelts pickled with formic acid and / or sulfuric acid are tanned with 0.5 to 12 percent by weight of chromium III salts, based on pelvis weight, which Pre-dull tanning liquor with base agents in the presence of aldehyde and / or keto acids to a pH between 3.6 and 4.3 and then blunted to a pH of 4.2 to 5.5 with alkali aluminum silicates. Pre-blunting is preferably carried out in the presence of glyoxylic acid.
- the process according to the invention is distinguished by a very high degree of exhaustion of the chrome tanning agents, with the result that the concentration of the chromium III salts in the tanning liquor can be significantly reduced in comparison with known processes.
- the residual chromium content of the exhausted tanning liquors is reduced to values less than 0.2 g Cr2O3 per liter of tanning liquor.
- the quality of the wetblue which are subjected to the tanning process according to the invention is significantly improved.
- the scar is finer and the wetblue color lighter than in conventional tanning processes, in which the blunting is carried out in the presence of dicarboxylic acids.
- the tanning of pelts piqued with formic acid and / or sulfuric acid is masked in a manner known per se with chromium III salts, for example with chromium III sulfates, basic chromium III sulfates and / or with organic acids such as formic acid, acetic acid Chromium III salts carried out in a pimple bath or in a new fleet.
- chromium III salts 0.5 to 12% by weight, preferably 3 to 6% by weight, based in each case on the pelvic weight, of chromium III salts are used.
- chromium III salts 0.5 to 3.0 wt. such as alkyl sulfars containing 12-18 carbon atoms.
- the tanning liquors preferably 0.3 to 0.7% by weight, based on the pelt weight, of base agents in the presence of preferably 0.3 to 4.0% by weight, particularly preferably 0.5 to 2.0% by weight .-%, based in each case on pelt weight, aldehyde and / or keto acids, such as pyruvic acid and / or glyoxylic acid.
- base agents preferably 0.3 to 4.0% by weight, particularly preferably 0.5 to 2.0% by weight .-%, based in each case on pelt weight, aldehyde and / or keto acids, such as pyruvic acid and / or glyoxylic acid.
- aldehyde and / or keto acids such as pyruvic acid and / or glyoxylic acid.
- keto acids such as pyruvic acid and / or glyoxylic acid.
- Magnesium oxide, dolomite, alkali metal carbonates, alkali metal bicarbonates are suitable as base agents and
- the tanning liquor is dulled to pH values between 4.2 and 5.5, preferably to pH values between 4.5 and 5.0, with 0.5 to 3.0% by weight, preferably with 1.0 to 2.0% by weight, based in each case on the pelt weight, of alkali aluminum silicates.
- the alkali aluminum silicates preferably sodium aluminum silicates, are added to the tanning liquors either in solid form or in the form of aqueous dispersions.
- the alkali aluminum silicates are accessible by known processes, for example by the processes written in DE-OS 27 32 217.
- the temperature of the tanning liquor after the addition of the alkali aluminum silicates is between 30 and 50 ° C., preferably between 35 and 45 ° C.
- all skin types for example of beef, pork, goat or sheep, can be tanned.
- Example 2 (comparison: DE-OS 35 16 842)
Landscapes
- 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
Die Erfindung betrifft ein Chromgerbverfahren, mit dem man eine vollständige Durchgerbung erreicht und mit dem die Chrombrühen praktisch restlos ausgezehrt werden.The invention relates to a chrome tanning process with which complete tanning is achieved and with which the chrome broths are practically completely exhausted.
Bei der Herstellung chromgegerbter Leder nach herkömmlichen Verfahren werden je nach Arbeitsweise etwa 70 bis 80 % der angebotenen Chrommenge in der Haut fixiert. Die restlichen 20 bis 30 % verbleiben in der sogenannten Restflotte, die nur mit großem Aufwand gereinigt werden kann.In the production of chrome-tanned leather using conventional methods, around 70 to 80% of the chromium offered is fixed in the skin, depending on the working method. The remaining 20 to 30% remain in the so-called residual liquor, which can only be cleaned with great effort.
Sowohl aus ökologischen als auch aus ökonomischen Gründen hat es in der Vergangenheit hicht an Versuchen gefehlt, die Chromaufnahme der Haut zu verbessern und die für eine kochgare Gerbung notwendige Chrommenge zu reduzieren.In the past, there has been a lack of attempts to improve the chromium absorption of the skin and to reduce the amount of chromium required for cookable tanning, both for ecological and economic reasons.
Zur Verbesserung der Chromauszehrung wurden beispielsweise in "Das Leder" 26, 21 bis 31 (1975) Recyclingverfahren vorgeschlagen, bei denen die Restflotten nach Zusatz von frischen Chromsalzen erneut zur Gerbung oder nach Ausfällung und Aufarbeitung zu Chromgerbstoffen wieder verwendet werden. Der Nachteil dieser Verfahren besteht jedoch darin, daß sich Lederfasern und unerwünschte Salze in den Gerbflotten anreichern und somit keine optimalen Gerbresultate mehr zulassen. Darüber hinaus sind diese Verfahren sehr umständlich in der Durchführung.To improve chromium exhaustion, recycling processes have been proposed, for example, in "Das Leder" 26 , 21 to 31 (1975), in which the remaining liquors are used again for tanning after the addition of fresh chromium salts or after precipitation and working up to chromium tannins. The disadvantage of this process, however, is that leather fibers and unwanted salts accumulate in the tanning liquors and therefore no longer permit optimal tanning results. In addition, these procedures are very cumbersome to implement.
In "Das Leder" 34, 89 bis 93 (1983) wird beschrieben, daß durch Verwendung von Magnesiumoxyd und Dicarbonsäuren zur Vorabstumpfung und von Natrium-Aluminiumsilikaten zur Endabstumpfung eine gute Auszehrung der Chromgerbflotte erzielt wird. Weiterhin ist aus DE-OS 35 16 842 bekannt, daß die Verwendung von Glyoxylsäure im Pickel zu einer Verbesserung der Chromauszehrung in Gerbflotten führt. Mit beiden Verfahren läßt sich jedoch kein zufriedenstellend hoher Auszehrungsgrad der Chromgerbflotten erreichen.In "The Leather" 34 , 89 to 93 (1983) it is described that the use of magnesium oxide and dicarboxylic acids for preliminary bluntings and sodium aluminum silicates for final bluntings results in a good exhaustion of the chrome tanning liquor. It is also known from DE-OS 35 16 842 that the use of glyoxylic acid in the pimple leads to an improvement in the chromium exhaustion in tanning liquors. However, with both methods it is not possible to achieve a satisfactorily high level of chromium tanning liquor consumption.
Die Aufgabe der Erfindung bestand daher in der Entwicklung eines Chromgerbverfahrens, mit dem im Vergleich zu den bekannten Verfahren eine noch höhere Auszehrung der Gerbflotten erreicht wird.The object of the invention was therefore to develop a chrome tanning process with which an even higher exhaustion of the tanning liquors is achieved in comparison with the known processes.
Die Erfindung geht von der überraschenden Feststellung aus, daß der Auszehrungsgrad von Gerbflotten wesentlich verbessert wird, wenn die Vorabstumpfung der Gerbflotte mit Basifizierungsmitteln in Gegenwart von Aldehyd- und/oder Ketosäuren durchgeführt wird.The invention is based on the surprising finding that the degree of exhaustion of tanning liquors is substantially improved if the tanning liquor is pre-dulled with basic agents in the presence of aldehyde and / or keto acids.
Gegenstand der Erfindung ist demzufolge ein Verfahren zur Chromgerbung mit hoher Chromauszehrung der Gerbflotten, welches dadurch gekennzeichnet ist, daß man mit Ameisensäure und/oder Schwefelsäure gepickelte Blößen mit 0,5 bis 12 Gewichtsprozent Chrom-III-Salzen, bezogen auf Blößengewicht, gerbt, die Gerbflotte mit Basifizierungsmitteln in Gegenwart von Aldehyd- und/oder Ketosäuren auf einen pH-Wert zwischen 3,6 und 4,3 vorabstumpft und anschließend mit Alkali-Aluminiumsilikaten auf einen pH-wert von 4,2 bis 5,5 abstumpft. Vorzugsweise wird die Vorabstumpfung in Gegenwart von Glyoxylsäure durchgeführt.The invention accordingly relates to a process for chrome tanning with a high chromium exhaustion of the tanning liquors, which is characterized in that pelts pickled with formic acid and / or sulfuric acid are tanned with 0.5 to 12 percent by weight of chromium III salts, based on pelvis weight, which Pre-dull tanning liquor with base agents in the presence of aldehyde and / or keto acids to a pH between 3.6 and 4.3 and then blunted to a pH of 4.2 to 5.5 with alkali aluminum silicates. Pre-blunting is preferably carried out in the presence of glyoxylic acid.
Das erfindungsgemäße Verfahren zeichnet sich durch einen sehr hohen Auszehrungsgrad der Chromgerbstoffe aus, mit der Folge, daß die Konzentration der Chrom-III-Salze in der Gerbflotte im Vergleich zu bekannten Verfahren deutlich verringert werden kann. Der Restchromgehalt der ausgezehrten Gerbflotten wird auf Werte kleiner 0,2 g Cr₂O₃ pro Liter Gerbflotte reduziert. Die Qualität der wetblue, die dem erfindungsgemäßen Gerbprozeß unterworfen werden, ist deutlich verbessert. Das Narbenbild ist feiner und die wetblue-Farbe heller als bei herkömmlichen Gerbverfahren, bei denen die Verabstumpfung in Gegenwart von Dicarbonsäuren durchgeführt wird.The process according to the invention is distinguished by a very high degree of exhaustion of the chrome tanning agents, with the result that the concentration of the chromium III salts in the tanning liquor can be significantly reduced in comparison with known processes. The residual chromium content of the exhausted tanning liquors is reduced to values less than 0.2 g Cr₂O₃ per liter of tanning liquor. The quality of the wetblue which are subjected to the tanning process according to the invention is significantly improved. The scar is finer and the wetblue color lighter than in conventional tanning processes, in which the blunting is carried out in the presence of dicarboxylic acids.
Die Gerbung von mit Ameisensäure und/oder Schwefelsäure gepikkelten Blößen wird in an sich bekannter Weise mit Chrom-III-Salzen, beispielsweise mit Chrom-III-Sulfaten, basischen Chrom-III-Sulfaten und/oder mit organischen Säuren wie Ameisensäure, Essigsäure, maskierten Chrom-III-Salzen im Pickelbad oder in neuer Flotte durchgeführt. Es werden 0,5 bis 12 Gew.-%, vorzugsweise 3 bis 6 Gew.-%, jeweils bezogen auf Blößengewicht, Chrom-III-Salze eingesetzt. In der Gerbflotte können 0,5 bis 3,0 Gew.-%, bezogen auf Blößengewicht, elektrolytbeständige Fettungsmittel, beispielsweise sulfitiertes Fischöl oder 0,5 bis 3,0 Gew.-%, bezogen auf Blößengewicht, Mischungen aus elektolytbeständigen Fettungsmitteln und Tensiden, wie Alkylsulfare mit 12-18 C-Atomen enthalten sein.The tanning of pelts piqued with formic acid and / or sulfuric acid is masked in a manner known per se with chromium III salts, for example with chromium III sulfates, basic chromium III sulfates and / or with organic acids such as formic acid, acetic acid Chromium III salts carried out in a pimple bath or in a new fleet. 0.5 to 12% by weight, preferably 3 to 6% by weight, based in each case on the pelvic weight, of chromium III salts are used. In the tanning liquor, 0.5 to 3.0 wt. such as alkyl sulfars containing 12-18 carbon atoms.
Zur Vorabstumpfung der Gerbflotten werden vorzugsweise 0,3 bis 0,7 Gew.-%, bezogen auf Blößengewicht, Basifizierungsmittel in Gegenwart von vorzugsweise 0,3 bis 4,0 Gew.-%, besonders bevorzugt von 0,5 bis 2,0 Gew.-%, jeweils bezogen auf Blößengewicht, Aldehyd- und/oder Ketosäuren, wie Brenztraubensäure und/oder Glyoxylsäure eingesetzt. Als Basifizierungsmittel eignen sich beispielsweise Magnesiumoxid, Dolomit, Alkalicarbonate, Alkalibicarbonate und/oder Erdalkalicarbonate. Vorzugsweise wird jedoch Magnesiumoxid eingesetzt.To pre-dull the tanning liquors, preferably 0.3 to 0.7% by weight, based on the pelt weight, of base agents in the presence of preferably 0.3 to 4.0% by weight, particularly preferably 0.5 to 2.0% by weight .-%, based in each case on pelt weight, aldehyde and / or keto acids, such as pyruvic acid and / or glyoxylic acid. Magnesium oxide, dolomite, alkali metal carbonates, alkali metal bicarbonates are suitable as base agents and / or alkaline earth carbonates. However, magnesium oxide is preferably used.
Die Abstumpfung der Gerbflotte auf pH-Werte zwischen 4,2 und 5,5, vorzugsweise auf pH-Werte zwischen 4,5 und 5,0 wird mit 0,5 bis 3,0 Gew.-%, vorzugsweise mit 1,0 bis 2,0 Gew.-%, jeweils bezogen auf Blößengewicht, Alkali-Aluminiumsilikaten durchgeführt. Die Alkali-Aluminiumsilikate, vorzugsweise Natrium-Aluminiumsilikate, werden den Gerbflotten entweder in fester Form oder in Form wäßriger Dispersionen zugesetzt. Die Alkali-Aluminiumsilikate sind nach bekannten Verfahren, beispielsweise nach den in DE-OS 27 32 217 geschriebenen Verfahren zugänglich. Die Temperatur der Gerbflotte nach Zugabe der Alkali-Aluminiumsilikate liegt zwischen 30 und 50 °C, vorzugsweise zwischen 35 und 45 °C.The tanning liquor is dulled to pH values between 4.2 and 5.5, preferably to pH values between 4.5 and 5.0, with 0.5 to 3.0% by weight, preferably with 1.0 to 2.0% by weight, based in each case on the pelt weight, of alkali aluminum silicates. The alkali aluminum silicates, preferably sodium aluminum silicates, are added to the tanning liquors either in solid form or in the form of aqueous dispersions. The alkali aluminum silicates are accessible by known processes, for example by the processes written in DE-OS 27 32 217. The temperature of the tanning liquor after the addition of the alkali aluminum silicates is between 30 and 50 ° C., preferably between 35 and 45 ° C.
Mit dem erfindungsgemäßen Verfahren lassen sich alle Hauttypen, beispielsweise von Rind, Schwein, Ziege oder Schaf, gerben.With the method according to the invention, all skin types, for example of beef, pork, goat or sheep, can be tanned.
Die Angabe Gewichtsprozent bezieht sich, sofern nicht anders angegeben, auf Blößengewicht.
konz. = konzentriert
min = MinutenUnless otherwise stated, the percent by weight relates to the weight of the nakedness.
conc. = concentrated
min = minutes
Ausgangsmaterial - Entkälkte und gebeizte Rindblößen, Dicke 4 mm
wetblue auf Bock und betriebsüblich weiterarbeitenStarting material - decalcified and pickled beef, thickness 4 mm
Wetblue on the goat and continue working as usual
Ausgangsmaterial - Entkälkte und gebeizte Rindblößen, Dicke 4 mm
wetblue auf Bock und betriebsüblich weiterarbeitenStarting material - decalcified and pickled beef, thickness 4 mm
Wetblue on the goat and continue working as usual
Ausgangsmaterial - Entkälkte und gebeizte Rindblößen, Dicke 4 mm
wetblue auf Bock und betriebsüblich weiterarbeiten
Wetblue on the goat and continue working as usual
Claims (5)
- A chrome tanning process with high chrome extraction of the tanning liquors, characterized in that pelts pickled with formic acid and/or sulfuric acid are tanned with 0.5 to 12% by weight chromium(III) salts, based on pelt rate, the tanning liquor is prebasified to pH 3.6 to 4.3 with basifying agents in the presence of aldehyde and/or keto acids and is then basified to pH 4.2 to 5.5 with alkali metal aluminium silicates.
- A process as claimed in claim 1, characterized in that the tanning liquor is prebasified with 0.3 to 0.7% by weight, based on pelt weight, basifying agents in the presence of 0.3 to 4.0% by weight and preferably 0.5 to 2.0% by weight, based on pelt weight, of aldehyde and/or keto acids.
- A process as claimed in one or both of claims 1 to 2, characterized in that magnesium oxide, dolomite, alkali metal carbonates, alkali metal bicarbonates, alkaline earth metal carbonates or mixtures thereof, preferably magnesium oxide, are used as basifying agents.
- A process as claimed in one or more of claims 1 to 3, characterized in that glyoxylic acid is used as the aldehyde and/or keto acid.
- A process as claimed in one or more of claims 1 to 4, characterized in that the tanning liquor is basified to pH 4.5 to 5.0 with sodium aluminium silicates.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3822823 | 1988-07-06 | ||
| DE3822823A DE3822823A1 (en) | 1988-07-06 | 1988-07-06 | GERB PROCESSES OF HIGH CHROME PERFORMANCE OF GERBFLOTTEN |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0349892A2 EP0349892A2 (en) | 1990-01-10 |
| EP0349892A3 EP0349892A3 (en) | 1992-01-15 |
| EP0349892B1 true EP0349892B1 (en) | 1994-09-21 |
Family
ID=6358054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89111743A Expired - Lifetime EP0349892B1 (en) | 1988-07-06 | 1989-06-28 | Tanning method presenting a high chrome exhaustion of the tanning bath |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US4938779A (en) |
| EP (1) | EP0349892B1 (en) |
| JP (1) | JPH0270800A (en) |
| KR (1) | KR0126916B1 (en) |
| AR (1) | AR245505A1 (en) |
| AT (1) | ATE111963T1 (en) |
| BR (1) | BR8903305A (en) |
| DE (2) | DE3822823A1 (en) |
| ES (1) | ES2058406T3 (en) |
| FI (1) | FI94149C (en) |
| MX (1) | MX170321B (en) |
| TR (1) | TR26613A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0583697A2 (en) * | 1992-08-14 | 1994-02-23 | Hoechst Aktiengesellschaft | Tanning process saving chrome and improved fixing of chrome |
| DE4323123A1 (en) * | 1993-07-10 | 1995-01-12 | Hoechst Ag | Process for dyeing fur skins with oxidation dyes |
| EP2853604A1 (en) * | 2013-09-30 | 2015-04-01 | Rhodia Poliamida E Especialidades Ltda | Tanning process |
| EP2853605A1 (en) * | 2013-09-30 | 2015-04-01 | Rhodia Poliamida E Especialidades Ltda | Tanning process for obtaining leather |
| CN104109723B (en) * | 2014-07-18 | 2016-02-03 | 四川德华皮革制造有限公司 | A kind of preparation method of both fur and leather skin of formaldehydeless chrome-free tanning |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3516842A1 (en) * | 1985-05-10 | 1986-11-13 | Hoechst Ag, 6230 Frankfurt | METHOD FOR CHROME SAVING |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2732217A1 (en) * | 1977-07-16 | 1979-02-01 | Henkel Kgaa | USE OF FINE-PIECE WATER-INSOLUBLE ALKALIAL ALUMINUM SILICATES IN THE MANUFACTURING OF LEATHER |
| US4272242A (en) * | 1977-07-16 | 1981-06-09 | Henkel Kommanditgesellschaft Auf Aktien | Use of water-insoluble aluminosilicates in tanning process for the production of leather |
-
1988
- 1988-07-06 DE DE3822823A patent/DE3822823A1/en not_active Withdrawn
-
1989
- 1989-06-28 AT AT89111743T patent/ATE111963T1/en not_active IP Right Cessation
- 1989-06-28 ES ES89111743T patent/ES2058406T3/en not_active Expired - Lifetime
- 1989-06-28 DE DE58908384T patent/DE58908384D1/en not_active Expired - Lifetime
- 1989-06-28 EP EP89111743A patent/EP0349892B1/en not_active Expired - Lifetime
- 1989-07-03 TR TR89/0534A patent/TR26613A/en unknown
- 1989-07-03 MX MX016672A patent/MX170321B/en unknown
- 1989-07-05 AR AR89314328A patent/AR245505A1/en active
- 1989-07-05 BR BR898903305A patent/BR8903305A/en not_active IP Right Cessation
- 1989-07-05 FI FI893276A patent/FI94149C/en not_active IP Right Cessation
- 1989-07-06 KR KR1019890009636A patent/KR0126916B1/en not_active IP Right Cessation
- 1989-07-06 JP JP1175395A patent/JPH0270800A/en active Pending
- 1989-07-06 US US07/376,262 patent/US4938779A/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3516842A1 (en) * | 1985-05-10 | 1986-11-13 | Hoechst Ag, 6230 Frankfurt | METHOD FOR CHROME SAVING |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0270800A (en) | 1990-03-09 |
| KR0126916B1 (en) | 1997-12-26 |
| BR8903305A (en) | 1990-02-13 |
| FI94149B (en) | 1995-04-13 |
| EP0349892A2 (en) | 1990-01-10 |
| DE3822823A1 (en) | 1990-01-11 |
| FI94149C (en) | 1995-07-25 |
| AR245505A1 (en) | 1994-01-31 |
| ES2058406T3 (en) | 1994-11-01 |
| US4938779A (en) | 1990-07-03 |
| MX170321B (en) | 1993-08-16 |
| FI893276A0 (en) | 1989-07-05 |
| FI893276A (en) | 1990-01-07 |
| KR900001862A (en) | 1990-02-27 |
| DE58908384D1 (en) | 1994-10-27 |
| TR26613A (en) | 1994-04-05 |
| ATE111963T1 (en) | 1994-10-15 |
| EP0349892A3 (en) | 1992-01-15 |
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