EP0339437A1 - Verfahren zur Chromspargerbung - Google Patents
Verfahren zur Chromspargerbung Download PDFInfo
- Publication number
- EP0339437A1 EP0339437A1 EP89106934A EP89106934A EP0339437A1 EP 0339437 A1 EP0339437 A1 EP 0339437A1 EP 89106934 A EP89106934 A EP 89106934A EP 89106934 A EP89106934 A EP 89106934A EP 0339437 A1 EP0339437 A1 EP 0339437A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chromium
- tanning
- acid
- salts
- iii
- 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.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 16
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title description 25
- 239000011651 chromium Substances 0.000 title description 10
- 229910052804 chromium Inorganic materials 0.000 title description 9
- 239000002253 acid Substances 0.000 claims abstract description 25
- BFGKITSFLPAWGI-UHFFFAOYSA-N chromium(3+) Chemical class [Cr+3] BFGKITSFLPAWGI-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000000203 mixture Substances 0.000 claims abstract description 22
- 150000003839 salts Chemical class 0.000 claims abstract description 15
- 150000003628 tricarboxylic acids Chemical class 0.000 claims abstract description 12
- 125000003118 aryl group Chemical group 0.000 claims abstract description 11
- 206010000496 acne Diseases 0.000 claims description 14
- HHLFWLYXYJOTON-UHFFFAOYSA-N glyoxylic acid Chemical compound OC(=O)C=O HHLFWLYXYJOTON-UHFFFAOYSA-N 0.000 claims description 14
- 239000011230 binding agent Substances 0.000 claims description 12
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 claims description 10
- 229910000514 dolomite Inorganic materials 0.000 claims description 8
- 239000010459 dolomite Substances 0.000 claims description 8
- -1 keto carboxylic acid Chemical class 0.000 claims description 7
- 150000001299 aldehydes Chemical class 0.000 claims description 5
- 229930194542 Keto Natural products 0.000 claims description 2
- HQWKKEIVHQXCPI-UHFFFAOYSA-L disodium;phthalate Chemical compound [Na+].[Na+].[O-]C(=O)C1=CC=CC=C1C([O-])=O HQWKKEIVHQXCPI-UHFFFAOYSA-L 0.000 claims 1
- 238000002203 pretreatment Methods 0.000 claims 1
- 239000000370 acceptor Substances 0.000 abstract 1
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 30
- 235000002639 sodium chloride Nutrition 0.000 description 18
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 12
- 239000010985 leather Substances 0.000 description 10
- GRWVQDDAKZFPFI-UHFFFAOYSA-H chromium(III) sulfate Chemical compound [Cr+3].[Cr+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GRWVQDDAKZFPFI-UHFFFAOYSA-H 0.000 description 9
- 239000003795 chemical substances by application Substances 0.000 description 8
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 7
- 150000007513 acids Chemical class 0.000 description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 6
- 235000015217 chromium(III) sulphate Nutrition 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 4
- 150000001844 chromium Chemical class 0.000 description 4
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 4
- 239000000395 magnesium oxide Substances 0.000 description 4
- 239000011780 sodium chloride Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 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 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical class OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 3
- 150000001735 carboxylic acids Chemical class 0.000 description 3
- 235000019253 formic acid Nutrition 0.000 description 3
- 239000011833 salt mixture Substances 0.000 description 3
- 239000001648 tannin Substances 0.000 description 3
- 235000018553 tannin Nutrition 0.000 description 3
- 229920001864 tannin Polymers 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- LCTONWCANYUPML-UHFFFAOYSA-N Pyruvic acid Chemical compound CC(=O)C(O)=O LCTONWCANYUPML-UHFFFAOYSA-N 0.000 description 2
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 229910000423 chromium oxide Inorganic materials 0.000 description 2
- 230000000873 masking effect Effects 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 159000000000 sodium salts Chemical class 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- KDYFGRWQOYBRFD-UHFFFAOYSA-N succinic acid Chemical compound OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 2
- 208000032544 Cicatrix Diseases 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 235000019606 astringent taste Nutrition 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 235000010216 calcium carbonate Nutrition 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical class [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 1
- 229910000356 chromium(III) sulfate Inorganic materials 0.000 description 1
- 239000011696 chromium(III) sulphate Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 150000004715 keto acids Chemical class 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 235000014380 magnesium carbonate Nutrition 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 150000002790 naphthalenes Chemical class 0.000 description 1
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 229940107700 pyruvic acid Drugs 0.000 description 1
- 231100000241 scar Toxicity 0.000 description 1
- 230000037390 scarring Effects 0.000 description 1
- 230000037387 scars Effects 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- RPACBEVZENYWOL-XFULWGLBSA-M sodium;(2r)-2-[6-(4-chlorophenoxy)hexyl]oxirane-2-carboxylate Chemical compound [Na+].C=1C=C(Cl)C=CC=1OCCCCCC[C@]1(C(=O)[O-])CO1 RPACBEVZENYWOL-XFULWGLBSA-M 0.000 description 1
- 239000001384 succinic acid Substances 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 239000002351 wastewater Substances 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
- C14C3/28—Multi-step processes
-
- 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
- C14C1/00—Chemical treatment prior to tanning
- C14C1/08—Deliming; Bating; Pickling; Degreasing
-
- 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
- Chrome tanning is an essential step in leather production.
- chromium salts are offered in a concentration which corresponds to an equivalent of 2 to 2.5% by weight of Cr 2 O 3, based on nakedness, in order to achieve a cookable leather. Of these, however, only 70 to 80% are actually permanently fixed in the skin, so that 20 to 30% of the chromium tannin offered ends up in the waste water.
- the level of chromium tanning can be improved.
- the increased astringency of the chrome tanning agents leads to scarring i.e. lower quality leathers. In most cases, a loss of space also has to be accepted.
- aromatic di- and tricarboxylic acids such as phthalic acid and / or their salts are used in pimples or in chrome tanning, to achieve a better fixation of the chromium in the skin. If they are used in the pimple, however, this leads to a significant reduction in the penetration speed of the subsequent chrome tanning agents, an uneven chrome distribution and, in the case of stronger, unsplit nakedness, even insufficient tanning in some cases.
- tanning must usually be carried out in two stages in order to reduce these deficiencies by using mild organic tanning which is carried out with mostly organically masked chromium (III) sulfate tanning agent and which is then carried out with the addition of aromatic di- and tricarboxylic acids follow alone or in the presence of further chrome tanning agent and / or a base agent.
- mild organic tanning which is carried out with mostly organically masked chromium (III) sulfate tanning agent and which is then carried out with the addition of aromatic di- and tricarboxylic acids follow alone or in the presence of further chrome tanning agent and / or a base agent.
- the invention relates to a process for chromium-saving tanning, in which the bosses are pretreated with 0.5 to 2% by weight, preferably 0.7 to 1.2% by weight, of an aldehyde or ketocarboxylic acid before the tanning Tanned and then tanned with 1 to 4.5% by weight, preferably 1 to 3% by weight, of a mixture of chromium (III) salts, acid-binding agents and aromatic di- or tricarboxylic acids or their salts.
- the preferred aldehyde or keto acid is glyoxylic acid, but also pyruvic acid.
- the pretreatment with these acids is carried out from an aqueous liquor with the above-mentioned concentrations. This pretreatment can be carried out separately, it is expedient to combine this pretreatment with these acids with the pimple.
- the combination with the pimple also has the advantage that the addition of the acids mentioned to the pimple eliminates the masking acids which are usually used there, such as formic acid or acetic acid.
- the pimple otherwise contains the usual acids and salts in the usual concentrations, for example 0.1 to 2% by weight sulfuric acid (90%). This pretreatment generally lasts 0.5 to 20 hours.
- the subsequent chrome tanning is carried out using the customary commercially available chromium (III) tannins according to the processes known per se.
- the chromium available, based on the pelt weight, is generally 0.8 to 1.5% by weight.
- the tanning time is approx. 30 to 180 minutes.
- chromium (III) salts for The tanning is suitable for the chrome (III) salts which are customarily used for chrome tanning, in particular chromium (III) sulfates, basic chromium (III) sulfates, and also with organic acids, for example formic acid, acetic acid, and chromium (III) salts masked , self-dulling chromium tanning agents which, in addition to chromium (III) salts, also contain inorganic salts, such as sodium sulfate, or reaction products of hexavalent chromium compounds with reducing agents.
- the tanning is carried out by treatment with an aqueous solution which contains chromium (III) salts, acid-binding agents and aromatic di- or tricarboxylic acids or their salts.
- the mixtures used for tanning preferably contain chromium sulfates and basic chromium sulfates as chromium (III) salts.
- Masked chromium (III) salts, in particular chromium (III) sulfates, which expediently only have a low degree of masking, can also be used.
- Suitable acid-binding agents are e.g. Dolomite, alkali carbonates and bicarbonates, alkaline earth carbonates and bicarbonates, magnesium oxide or sodium sulfite.
- the dolomite can be used either alone or in combination with other acid-binding substances, the dolomite content of the mixtures preferably being at least 10% of the total amount of acid-binding agents used.
- dolomite Mixtures containing 10 to 130% by weight of dolomite per 100% by weight of Cr2O3 are particularly suitable.
- the amount of dolomite to be used depends on the basicity of the chromium (III) salts used, and also on the basicity to which these chromium (III) compounds are to be made in the course of the tanning, on the basicity and the amount of those used in the preliminary tanning Chromium (III) salts and according to the amount of other acid-binding substances which may be used in the mixture.
- Aromatic dicarboxylic acids and tricarboxylic acids with 8 to 13 carbon atoms are those of the benzene and naphthalene series which, in addition to the carboxyl groups, can also contain hydroxyl, amino or nitro groups and / or halogen atoms. Phthalic acid and isophthalic acid are preferably used. Aromatic di- and tricarboxylic acids, which contain sulfonic acid groups in addition to the carboxyl groups, can only be used up to about a third of the total amount of carboxylic acid used.
- the carboxylic acids can expediently be used both in the form of the free acids, in the form of mixtures of the free acids and the salts of such carboxylic acids and also solely in the form of the salts, the alkali metal salts. Powdery mixtures of the free carboxylic acids and their salts in a molar ratio of 60:40 and 40:60 are preferably used.
- the tanning is expediently carried out in the same bath by adding the mixtures in powder form.
- the components of the claimed mixtures can preferably be added together. Only a few of these components can be added together, but also each individually.
- the basic chromium (III) salts are expediently added alone or together with further components. These chromium (III) salts can also be added together with the chromium (III) salts used for pretanning.
- the amounts of the mixtures to be used are such that the total amount of Cr2O3 offered in the pretanning and retanning is 1.2 to 2%, in particular 1.5 to 1.8% Cr2O3, based on the weight of the skin, and that the aromatic di - And / or tricarboxylic acids with 8-14 carbon atoms and / or their salts amount to at least 1.0 mole per mole of chromium oxide of the total chrome tanning agents used both for pretanning and for tanning.
- the tanning is carried out with a liquor in a liquor ratio of less than 100%, preferably 10 to 50%, based on the pelt weight, at temperatures of approx. 36-45 ° C.
- the tanning is carried out in such a way that at the end of the tanning the liquor has a pH of more than 3.6, in particular 3.9 to 4.5.
- the tanning process takes approximately 7 to 12 hours.
- the method of operation described above is particularly recommended for thinner nakedness.
- about 0.5 to 2.5% by weight, preferably 0.5 to 1.5% by weight, based on the nakedness, is used.
- the rest of this mixture about 1.5 to 2 wt .-%, is then used for tanning as described above. All of the operations described can be carried out in the same bathroom, but you can also work in several separate steps.
- the leather obtained by this process is cooked, soft, firm-grained, extremely fine-grained, easy to color with excellent physical properties and good yield.
- the chromium oxide content in the residual tannin liquor is extremely low.
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)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3814220 | 1988-04-27 | ||
| DE3814220A DE3814220A1 (de) | 1988-04-27 | 1988-04-27 | Verfahren zur chromspargerbung |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0339437A1 true EP0339437A1 (de) | 1989-11-02 |
Family
ID=6353008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89106934A Withdrawn EP0339437A1 (de) | 1988-04-27 | 1989-04-18 | Verfahren zur Chromspargerbung |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US4978361A (es) |
| EP (1) | EP0339437A1 (es) |
| JP (1) | JPH01315500A (es) |
| KR (1) | KR900016474A (es) |
| AR (2) | AR240483A1 (es) |
| AU (1) | AU614055B2 (es) |
| BR (1) | BR8901956A (es) |
| DE (1) | DE3814220A1 (es) |
| PT (1) | PT90355A (es) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2686099A1 (fr) * | 1992-01-14 | 1993-07-16 | Hoechst France | Application de sols de silice a l'obtention d'une peau dite blanc pickle stabilise ou blanc stabilise. |
| EP0634517A1 (de) * | 1993-07-10 | 1995-01-18 | Hoechst Aktiengesellschaft | Verfahren zum Färben von Pelzfellen mit Oxidationsfarbstoffen |
| EP0822263A1 (en) * | 1996-07-31 | 1998-02-04 | Seta S.A.-Extrativa Tanino de Acacia | Leather tanning process |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0583697A2 (de) * | 1992-08-14 | 1994-02-23 | Hoechst Aktiengesellschaft | Verfahren zur Chromspar- und Chromfüllgerbung |
| TR200708916A1 (tr) * | 2007-12-25 | 2009-07-21 | Soda Sanay� A.�. | Krom komplekslerinin dericilikte kullanılması. |
| 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 |
| CN105567885B (zh) * | 2016-01-26 | 2017-11-21 | 湖州长城皮业有限公司 | 一种无铬鞣猪皮二层鞋里革制备工艺 |
| CN105543425B (zh) * | 2016-01-26 | 2017-11-17 | 湖州长城皮业有限公司 | 一种无铬鞣山羊皮服装革制备工艺 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2271290A1 (es) * | 1974-05-18 | 1975-12-12 | Bayer Ag | |
| EP0201054A1 (de) * | 1985-05-10 | 1986-11-12 | Hoechst Aktiengesellschaft | Verfahren zur Chromspargerbung |
-
1988
- 1988-04-27 DE DE3814220A patent/DE3814220A1/de not_active Withdrawn
-
1989
- 1989-04-13 AR AR313664A patent/AR240483A1/es active
- 1989-04-18 EP EP89106934A patent/EP0339437A1/de not_active Withdrawn
- 1989-04-24 PT PT90355A patent/PT90355A/pt not_active Application Discontinuation
- 1989-04-25 US US07/343,010 patent/US4978361A/en not_active Expired - Fee Related
- 1989-04-25 AR AR313762A patent/AR240482A1/es active
- 1989-04-25 KR KR1019890005413A patent/KR900016474A/ko not_active Application Discontinuation
- 1989-04-26 BR BR898901956A patent/BR8901956A/pt not_active Application Discontinuation
- 1989-04-26 JP JP1104780A patent/JPH01315500A/ja active Pending
- 1989-04-26 AU AU33350/89A patent/AU614055B2/en not_active Ceased
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2271290A1 (es) * | 1974-05-18 | 1975-12-12 | Bayer Ag | |
| EP0201054A1 (de) * | 1985-05-10 | 1986-11-12 | Hoechst Aktiengesellschaft | Verfahren zur Chromspargerbung |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2686099A1 (fr) * | 1992-01-14 | 1993-07-16 | Hoechst France | Application de sols de silice a l'obtention d'une peau dite blanc pickle stabilise ou blanc stabilise. |
| EP0551785A1 (fr) * | 1992-01-14 | 1993-07-21 | SOCIETE FRANCAISE HOECHST Société anonyme dite: | Application de sols de silice à l'obtention d'une peau dite blanc picklé stabilisé ou blanc stabilisé |
| US5480456A (en) * | 1992-01-14 | 1996-01-02 | Societe Francaise Hoechst | Silica sols for obtaining a hide which is called a stabilized pickled or white or stabilized white |
| EP0634517A1 (de) * | 1993-07-10 | 1995-01-18 | Hoechst Aktiengesellschaft | Verfahren zum Färben von Pelzfellen mit Oxidationsfarbstoffen |
| US5466263A (en) * | 1993-07-10 | 1995-11-14 | Hoechst Aktiengesellschaft | Process for dyeing fur skins with oxidation dyes |
| EP0822263A1 (en) * | 1996-07-31 | 1998-02-04 | Seta S.A.-Extrativa Tanino de Acacia | Leather tanning process |
Also Published As
| Publication number | Publication date |
|---|---|
| AR240482A1 (es) | 1990-04-30 |
| PT90355A (pt) | 1989-11-10 |
| BR8901956A (pt) | 1989-12-05 |
| AU3335089A (en) | 1989-11-02 |
| AU614055B2 (en) | 1991-08-15 |
| DE3814220A1 (de) | 1989-11-09 |
| US4978361A (en) | 1990-12-18 |
| KR900016474A (ko) | 1990-11-13 |
| AR240483A1 (es) | 1990-04-30 |
| JPH01315500A (ja) | 1989-12-20 |
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