GB2075051A - Tanning composition - Google Patents
Tanning composition Download PDFInfo
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- GB2075051A GB2075051A GB8111559A GB8111559A GB2075051A GB 2075051 A GB2075051 A GB 2075051A GB 8111559 A GB8111559 A GB 8111559A GB 8111559 A GB8111559 A GB 8111559A GB 2075051 A GB2075051 A GB 2075051A
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- United Kingdom
- Prior art keywords
- acid
- tanning
- tanning composition
- salt
- composition according
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- 239000000203 mixture Substances 0.000 title claims abstract description 34
- 150000003839 salts Chemical class 0.000 claims abstract description 19
- 235000002906 tartaric acid Nutrition 0.000 claims abstract description 13
- 235000012208 gluconic acid Nutrition 0.000 claims abstract description 7
- 239000002253 acid Substances 0.000 claims abstract description 6
- 239000007787 solid Substances 0.000 claims abstract description 6
- 125000001931 aliphatic group Chemical group 0.000 claims abstract description 5
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 claims abstract description 5
- 235000015165 citric acid Nutrition 0.000 claims abstract description 5
- 235000014655 lactic acid Nutrition 0.000 claims abstract description 4
- 235000011090 malic acid Nutrition 0.000 claims abstract description 4
- 239000010985 leather Substances 0.000 claims description 20
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 12
- 239000011975 tartaric acid Substances 0.000 claims description 12
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical group [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 10
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 10
- RGHNJXZEOKUKBD-SQOUGZDYSA-N D-gluconic acid Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C(O)=O RGHNJXZEOKUKBD-SQOUGZDYSA-N 0.000 claims description 8
- RGHNJXZEOKUKBD-UHFFFAOYSA-N D-gluconic acid Natural products OCC(O)C(O)C(O)C(O)C(O)=O RGHNJXZEOKUKBD-UHFFFAOYSA-N 0.000 claims description 6
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 claims description 6
- 239000000174 gluconic acid Substances 0.000 claims description 6
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims description 6
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 claims description 3
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 3
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 claims description 3
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 3
- 239000004310 lactic acid Substances 0.000 claims description 3
- 239000001630 malic acid Substances 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 159000000007 calcium salts Chemical group 0.000 claims description 2
- 125000004432 carbon atom Chemical group C* 0.000 claims description 2
- -1 FeSO4.7H2O Chemical class 0.000 abstract description 10
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 abstract 1
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 25
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 12
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 10
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 8
- 235000014113 dietary fatty acids Nutrition 0.000 description 6
- 239000000194 fatty acid Substances 0.000 description 6
- 229930195729 fatty acid Natural products 0.000 description 6
- 229910000029 sodium carbonate Inorganic materials 0.000 description 6
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 5
- 235000019253 formic acid Nutrition 0.000 description 5
- 239000011780 sodium chloride Substances 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 241001494479 Pecora Species 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 150000004665 fatty acids Chemical class 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 241000283690 Bos taurus Species 0.000 description 2
- FRPHFZCDPYBUAU-UHFFFAOYSA-N Bromocresolgreen Chemical compound CC1=C(Br)C(O)=C(Br)C=C1C1(C=2C(=C(Br)C(O)=C(Br)C=2)C)C2=CC=CC=C2S(=O)(=O)O1 FRPHFZCDPYBUAU-UHFFFAOYSA-N 0.000 description 2
- 235000019687 Lamb Nutrition 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 239000000975 dye Substances 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 235000021323 fish oil Nutrition 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- HLBBKKJFGFRGMU-UHFFFAOYSA-M sodium formate Chemical compound [Na+].[O-]C=O HLBBKKJFGFRGMU-UHFFFAOYSA-M 0.000 description 2
- 239000001117 sulphuric acid Substances 0.000 description 2
- 235000011149 sulphuric acid Nutrition 0.000 description 2
- OHVLMTFVQDZYHP-UHFFFAOYSA-N 1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-2-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]ethanone Chemical compound N1N=NC=2CN(CCC=21)C(CN1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)=O OHVLMTFVQDZYHP-UHFFFAOYSA-N 0.000 description 1
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 description 1
- LDXJRKWFNNFDSA-UHFFFAOYSA-N 2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]ethanone Chemical compound C1CN(CC2=NNN=C21)CC(=O)N3CCN(CC3)C4=CN=C(N=C4)NCC5=CC(=CC=C5)OC(F)(F)F LDXJRKWFNNFDSA-UHFFFAOYSA-N 0.000 description 1
- JQMFQLVAJGZSQS-UHFFFAOYSA-N 2-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-N-(2-oxo-3H-1,3-benzoxazol-6-yl)acetamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)CC(=O)NC1=CC2=C(NC(O2)=O)C=C1 JQMFQLVAJGZSQS-UHFFFAOYSA-N 0.000 description 1
- 241000283707 Capra Species 0.000 description 1
- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 244000309466 calf Species 0.000 description 1
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 150000004688 heptahydrates Chemical class 0.000 description 1
- 159000000014 iron salts Chemical class 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 235000021110 pickles Nutrition 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 239000000176 sodium gluconate Substances 0.000 description 1
- 235000012207 sodium gluconate Nutrition 0.000 description 1
- 229940005574 sodium gluconate Drugs 0.000 description 1
- 239000008247 solid mixture Substances 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 238000005406 washing Methods 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
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)
Abstract
A tanning composition in solid form, comprises a ferrous (Fe<II>) salt, e.g. FeSO4.7H2O, and an aliphatic hydroxy-carboxylic acid or a salt thereof. The acid may be glycolic, lactic, tartaric, malic, citric or gluconic acids.
Description
SPECIFICATION
Improvements in or relating to organic compounds
The present invention relates to a tanning composition in solid form and to a process for tanning pelts in the presence of such a tanning composition.
It is generally believed that although ferric salts can be used as tanning agents, ferreous salts are completely useful for this purpose. Nevertheless, French Patent 881,676 discloses a tanning process using a solution containing a ferreous salt and tartaric or citric acid. However, according to the single
Example, the pseudo-tanned pelt is oxidized with air. In 1 947 it was still stated in a dissertation that ferreous salts are inactive in tanning pelts or skins. The only tanning process using iron salts which has been developed is the so-called "ferrigan" tanning process employing ferric (Fe"') salts.
It has now been found that powdered mixtures of a ferreous (Fe") salt and an aliphatic hydroxycarboxylic acid can be used for tanning skins and pelts without an oxidation step, i.e. the ferreous salt acts in its diva lent form as tanning agent.
Accordingly, the present invention provides a tanning composition in solid form comprising
a) a ferreous (Fe") salt, and
b) an aliphatic hydroxy-carboxylic acid/or salt thereof.
The preferred ferreous salt a) is ferreous sulphate in the form of the heptahydrate (FeSO4, 7H20).
Suitable aliphatic hydroxy-carboxylic acids for component b) are those containing 2 to 8 carbon atoms, one or more carboxy groups, preferably 1 to 3 carboxy groups, and one or more hydroxy groups, preferably 1 to 6 hydroxy groups. Preferred aliphatic hydroxy-carboxylic acids include glycolic acid, lactic acid, tartaric acid, malic acid, citric acid and gluconic acid or mixtures thereof. Suitable salts for component b) are e.g. alkali metal salts, e.g. sodium or potassium. However, component b) is preferably present in the free acid form, except for gluconic acid which is preferably used in form of an alkali metal or alkaline-earth metal salt, e.g. sodium or calcium salt. Gluconic acid may also be employed in its dehydrated form, e.g. gluconic acid-3-lactone. More preferred component b) is tartaric acid.
The weight ratio of the ferreous salt a) to component b) is approximately from 3:1 to 5 :1, preferably 4:1.
The solid composition of the invention is prepared by mixing and grinding according to known methods both components together until an homogeneous powder is obtained.
The present invention provides also a process for tanning pelts by contacting them with a solid tanning composition such as specified above.
The amount of composition to be used may vary within wide limits, depending on factors such as the origin and the nature of the pelts and the type of leather desired. Satisfactory results are obtained when the composition is used in an amount from 7 to 40%, preferably from 1 3 to 25% by weight based on the weight of the pickled pelt.
When for example a composition comprising FeSO4, 7H20 and tartaric acid is used, it is preferably employed in the following amounts with respect to the mentioned pelts:
Amount of
Composition FeSO4, 7H20 in% in% Sheep and lamb pelts 15.2 12
Goat and kid skins 15.2 12
Pig skins 20.3 1 6 Calf and side skins 20.3 1 6 The tanning may be carried out according to known methods, e.g. as with chrome tanning powder.
The rate of penetration of the ferreous salt depends on factors such as the concentration in the treatment bath, the temperature, the rotation speed of the drum and the thickness of the pelts. Usually, the treatment duration with the composition is from 1 to 4 hours. Subsequently, the pH of the treatment bath is adjusted to approximately 4.2-4.8. After the tanning, the resulting leather may be aged, usually for 2-3 days and, if desired, it may be dyed. The affinity of the leather obtained according to the invention for dyestuffs is good. Furthermore, the resulting leather is flexible, supple and has a full handle. It does not shrink when treated for 1 minute with hot water at 900 C.
The composition of the invention may also be used for tanning pelts or skins in combination with chrome tanning compositions.
The following Examples further serve to illustrate the invention. In the Examples all parts are by weight and all temperatures in degrees Centigrade. All percentages are by weight and, except otherwise stated, based on the pickled weight.
EXAMPLE 1
3 degreased pickled sheep pelts (weighing 2300 g) are treated at 300 with 100% of a 5% sodium chloride solution in a glass drum having a diameter of 60 cm and rotating at a speed of 10 r.p.m. 1% of an amphoteric sulpho group-containing fatty acid derivative (commercially available, e.g. as Tergolix A, Sandoz, Switzerland) is added thereto followed, after 10 minutes, by the addition of 0.8% formic acid 85% and 0.1% concentrated sulphuric acid. After 30 minutes, the final pH is about 1.7.
15% of a homogeneous powdered mixture of 790 parts of FeSO4, 7H20 and 210 parts tartaric acid are then added and after 2 hours of treatment, the pH is 1.8.5, 5% calcinated sodium carbonate diluted to 1:20 with water is added slowly and dropwise over the course of 2 hours, the pH being 4.9.
After a further hour of treatment, the rotation of the drum is stopped for the night and next morning started again for 1 hour. The pH of the treatment bath is now 3.8. A further 5% of calcinated sodium carbonate diluted to 1:20 with water is added dropwise over a period of 15 minutes whereby the final pH is 4.2.
The pelts are aged for 3 days and exhibit thereafter in the wet state a light green-yellow shade.
When submitted to the hot water test (900 for 1 minute), the leather does not shrink. Subsequently, the leather is sammed and shaved.
The following percentages are based on the shaved weight.
The resulting leather is washed at 300 for 10 minutes with 500% water and subsequently treated at 30 for 1 hour with 300% water and 1% sodium formiate (pH of the bath after 1 hour: 4.9). A section of the leather stained with bromocresol green gives a green-blue shade. The leather is then dyed at 400 in a dyebath containing 300% water, 2% of a commercially available anionic fatty acid derivative (e.g.
Sandolix(B) WWL, Sandoz, Switzerland) and 3% of dyestuff C.I. Acid Brown 362. After dyeing for 45 minutes, 1% formic acid 85% is added and the leather is further treated for 1 5 minutes. The dyed leather is washed at 300 for 1 5 minutes with 500% water and subsequently fat liquored at 500C in 300% water containing 4% of a commercially available sulphated fish oil and 4% of an emulsion of a commercially available anionic synthetic fatty acid derivative (e.g. Sandolix(F) SE, Sandoz, Switzerland).
After 60 minutes, the bath is acidified with 1% formic acid 85% and the leather is washed at 300 for 5 minutes with 500% water. After ageing on a horse, the leather is sammed, set out, dried, laid in damp sawdust, staked and toggled.
Evenly dyed leather with a full handle and a good softness is obtained.
EXAMPLE 2
A pickled bovine side weighing 3200 g is treated at 200 for 10 minutes with 100% of a 5% sodium chloride solution in a glass drum having a diameter of 60 cm and rotating at a speed of 8 rpm. After the addition of 0.2% sulphuric acid, the pelt is further treated for 40 minutes. The final pH is 1.6.
20% of a powdered mixture of 790 parts FeSO4, 7H20 and 210 parts tartaric acid is added thereto and the pelt is treated for 4 hours (pH = 1.7). 5.0% sodium carbonate (diluted to 1 :20 with water) is added dropwise to the treatment bath in 5 portions at intervals of 30 minutes. After a further hour of treatment (pH = 4.2), the rotation of the drum is stopped for the night and started again next morning for 30 minutes (pH = 3.9). A further 1.5% of sodium carbonate diluted to 1:20 with water is added dropwise over 1 hour and the side is treated for a further hour (pH = 4.8.).
After ageing for 3 days, the tanned side exhibits in the wet state a light green yellow shade. When submitted to the hot water test (900 for 1 minute), it does not shrink. Subsequently, the side is sammed and shaved. It is then washed for 10 minutes at 300 with 500% water and thereafter for 1 hour with 300% water and 0.8% sodium formic acid salt (pH of the bath: 4.8). A section of the leather stained with bromocresolgreen is green-blue at the edge and yellow in the middle.
After washing at 300 for 10 minutes with 500% water, the leather is dyed for 30 minutes at 400 in a bath containing 300% water, 2% of the anionic fatty acid derivative of Example 1 and 1% of the dyestuff C.I. Acid Brown 362. The dyebath is then slightly acidified by the addition over 1 5 minutes of 0.5% formic acid 85%. Subsequently, the dyed leather is treated at 400 for 45 minutes with 300% water containing 4% fish oil and 4% of the anionic fatty acid derivative of Example 1. After acidification of the bath with formic acid for 10 minutes, the leather is washed for 5 minutes with 500% water, dried, laid in damp sawdust, staked and toggled.
A leather with a full handle and a somewhat firm feel is obtained.
EXAMPLE 3
2 degreased pickled sheep skins weighing 1 500 g are treated for 10 minutes at 300 with 100% of a 5% sodium chloride solution in a glass drum having a diameter of 60 cm and a rotation speed of 10 rpm. 20% of a mixture of 819 parts FeSO4, 7H20, 74 tartaric acid and 107 parts sodium gluconate is added thereto and the skins are treated for 2 hours (pH = 2.0). 6% sodium carbonate diluted to 1 :20 with water is added portionwise in 5 portions at intervals of 30 minutes. After 2 hours of treatment, the pH of the bath is 4.5. The skins are laid on a horse. When the tanned skins are submitted 1 hour later to the hot water test at 900 for 1 minute, they do not shrink.
EXAMPLE 4
2 bovine sides having a pelt weight of 7200 g are delimed as for a normal chrome tannage, and then bated and pickled. Tanning is started with 3% of a commercially available tanning agent (26% chrome oxide and 33% basicity). Two hours later, 8% of a mixture containing 790 parts of FeSO4, 7H2O and 210 parts tartaric acid is added thereto. After 2 hours, 3% sodium carbonate diluted to 1:20 with water is added dropwise over the course of 2 hours. After two further hours, the final pH is 4.6. The tanned skins are laid on a horse. When they are submitted one hour after tanning to the hot water test at 900 for 1 minute, they do not shrink.
EXAMPLE 5
2 Australian lamb skins weighing 620 g are soaked, fleshed, scoured and pickled according to known methods. All percentages are based on the dry weight of the skins.
After the pickle, the skins are aged for 1 day. Subsequently, they are introduced in a bath at 350 containing 2000% water, 50 g/l sodium chloride and 0.5 g/l of the amphoteric fatty acid derivative of
Example 1. After 20 minutes, 16 g/l of a mixture of 790 parts FeSO4, 7H2O and 210 parts tartaric acid is added thereto and followed, after 2 hours of treatment, by the addition of 4 g/l of an aqueous emulsion containing a commercially available cationic ethoxylated aliphatic ester-amide (e.g. Katalix(H) GS,
Sandoz, Switzerland). After 2 further hours of treatment, the bath is neutralized with 5.0 g/l sodium bicarbonate which is added slowly in 5 portions at intervals of 30 minutes and the skins are treated for 1 hour. Thereafter, the tanned skins are aged for 1 day. When submitted to the hot water test at 800 for 1 minute, the tanned skins do not shrink.
Claims (14)
1. A tanning composition in solid form comprising
a) a ferreous (Fe") salt, and
b) an aliphatic hydroxy-carboxylic acid or salt thereof.
2. A tanning composition according to claim 1, in which the ferreous salt is FeSO4, 7H2O.
3. A tanning composition according to claims 1 and 2, in which the aliphatic hydroxy-carboxylic acid is an acid containing 2 to 8 carbon atoms, 1 to 3 carboxy groups and 1 to 6 hydroxy groups.
4. A tanning composition according to claim 3, in which the aliphatic hydroxycarboxylic acid is selected from glycolic acid, lactic acid, tartaric acid, malic acid, citric acid and gluconic acid or mixtures thereof.
5. A tanning composition according to claim 4, in which glycolic acid, lactic acid, tartaric acid, malic acid and citric acid are used in the free acid form.
6. A tanning composition according to claim 4, in which gluconic acid is used in the salt form.
7. A tanning composition according to claim 6, in which gluconic acid is used in the.sodium or calcium salt form.
8. A tanning composition according to any one of claims 1 to 5, comprising
a) FeSO4, 7H2O, and
b) tartaric acid.
9. A tanning composition according to any one of the preceding claims, in which the weight ratio of the ferreous salt a) to component b) is from 3 :1 to 5:1.
1 0. A tanning composition according to any one of the preceding claims substantially as hereinbefore described with reference to any one of Examples 1 to 5.
1 A process for tanning pelts or skins comprising contacting the pelts and skins with a tanning composition in solid form according to any one of claims 1 to 10.
12. A process according to claim 1 in which the composition is used in an amount from 7 to 40% by weight based on the weight of the pickled pelt.
13. A process according to claim 12, in which the composition is used in an amount from 13 to 25% by weight based on the weight of the pickled pelt.
14. A process according to any one of claims 11 to 1 3 substantially as hereinbefore described with reference to any one of Examples 1 to 5.
1 5. Leather whenever obtained by a process according to any one of claims 11 to 14.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH3305/80A CH647259A5 (en) | 1980-04-29 | 1980-04-29 | METHOD FOR TANNING ANIMAL SKIN AND SKIN WITH IRON SALT. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2075051A true GB2075051A (en) | 1981-11-11 |
| GB2075051B GB2075051B (en) | 1983-11-16 |
Family
ID=4253110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8111559A Expired GB2075051B (en) | 1980-04-29 | 1981-04-13 | Tanning composition |
Country Status (6)
| Country | Link |
|---|---|
| CH (1) | CH647259A5 (en) |
| DE (1) | DE3114768A1 (en) |
| FR (1) | FR2481319A1 (en) |
| GB (1) | GB2075051B (en) |
| IN (1) | IN158336B (en) |
| IT (1) | IT1170927B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3537511A1 (en) * | 1984-10-24 | 1986-06-12 | Tioxide Group Plc, London | LEATHER TANNING METHOD USING ALUMINUM (III) AND TITANIUM (IV) COMPLEXES |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009115487A1 (en) * | 2008-03-20 | 2009-09-24 | Basf Se | Method for manufacturing leather |
| EP3670675A1 (en) * | 2018-12-21 | 2020-06-24 | LANXESS Deutschland GmbH | Leather agents for beamhouse |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB305562A (en) * | 1927-11-07 | 1929-02-07 | Edmund Georg Stiasny | An improved process for tanning hides and skins |
| FR881676A (en) * | 1941-04-15 | 1943-05-05 | New tanning process for leather and fur hides |
-
1980
- 1980-04-29 CH CH3305/80A patent/CH647259A5/en not_active IP Right Cessation
-
1981
- 1981-04-11 DE DE19813114768 patent/DE3114768A1/en not_active Withdrawn
- 1981-04-13 GB GB8111559A patent/GB2075051B/en not_active Expired
- 1981-04-22 FR FR8108163A patent/FR2481319A1/en active Granted
- 1981-04-28 IT IT48363/81A patent/IT1170927B/en active
-
1982
- 1982-04-12 IN IN402/CAL/82A patent/IN158336B/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3537511A1 (en) * | 1984-10-24 | 1986-06-12 | Tioxide Group Plc, London | LEATHER TANNING METHOD USING ALUMINUM (III) AND TITANIUM (IV) COMPLEXES |
Also Published As
| Publication number | Publication date |
|---|---|
| IN158336B (en) | 1986-10-25 |
| CH647259A5 (en) | 1985-01-15 |
| IT8148363A0 (en) | 1981-04-28 |
| FR2481319B1 (en) | 1984-09-14 |
| FR2481319A1 (en) | 1981-10-30 |
| IT1170927B (en) | 1987-06-03 |
| GB2075051B (en) | 1983-11-16 |
| DE3114768A1 (en) | 1982-02-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |