EP1520911B1 - Method for manufacturing leather - Google Patents
Method for manufacturing leather Download PDFInfo
- Publication number
- EP1520911B1 EP1520911B1 EP03425647A EP03425647A EP1520911B1 EP 1520911 B1 EP1520911 B1 EP 1520911B1 EP 03425647 A EP03425647 A EP 03425647A EP 03425647 A EP03425647 A EP 03425647A EP 1520911 B1 EP1520911 B1 EP 1520911B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hides
- weight
- watery
- retanned
- emulsion
- 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
- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000010985 leather Substances 0.000 title claims abstract description 41
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 238000011282 treatment Methods 0.000 claims description 39
- 239000000839 emulsion Substances 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 239000003795 chemical substances by application Substances 0.000 claims description 17
- 238000004043 dyeing Methods 0.000 claims description 17
- 229920001296 polysiloxane Polymers 0.000 claims description 16
- 239000004925 Acrylic resin Substances 0.000 claims description 13
- 229920000178 Acrylic resin Polymers 0.000 claims description 13
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 12
- 150000001875 compounds Chemical class 0.000 claims description 12
- 239000000975 dye Substances 0.000 claims description 12
- 150000003839 salts Chemical class 0.000 claims description 11
- 239000003921 oil Substances 0.000 claims description 10
- 239000012071 phase Substances 0.000 claims description 10
- 230000002209 hydrophobic effect Effects 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 230000001050 lubricating effect Effects 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- 238000004061 bleaching Methods 0.000 claims description 7
- 239000012074 organic phase Substances 0.000 claims description 7
- -1 siloxane compounds Chemical class 0.000 claims description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 5
- 125000002091 cationic group Chemical group 0.000 claims description 5
- 239000011651 chromium Substances 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 235000006408 oxalic acid Nutrition 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 3
- 125000000129 anionic group Chemical group 0.000 claims description 3
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 229910000077 silane Inorganic materials 0.000 claims description 3
- JVBXVOWTABLYPX-UHFFFAOYSA-L sodium dithionite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])=O JVBXVOWTABLYPX-UHFFFAOYSA-L 0.000 claims description 3
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 2
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims description 2
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims description 2
- 239000001099 ammonium carbonate Substances 0.000 claims description 2
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 2
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 2
- 235000013870 dimethyl polysiloxane Nutrition 0.000 claims description 2
- 239000000194 fatty acid Substances 0.000 claims description 2
- 229930195729 fatty acid Natural products 0.000 claims description 2
- 150000004665 fatty acids Chemical class 0.000 claims description 2
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 2
- 239000000344 soap Substances 0.000 claims description 2
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 2
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 2
- 239000004615 ingredient Substances 0.000 claims 6
- 238000004078 waterproofing Methods 0.000 abstract description 15
- 238000005562 fading Methods 0.000 abstract description 3
- 241000283690 Bos taurus Species 0.000 abstract description 2
- 238000005406 washing Methods 0.000 description 9
- 230000005068 transpiration Effects 0.000 description 8
- 239000004744 fabric Substances 0.000 description 6
- 238000005461 lubrication Methods 0.000 description 6
- 239000011148 porous material Substances 0.000 description 6
- 239000002253 acid Substances 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 239000001648 tannin Substances 0.000 description 4
- 235000018553 tannin Nutrition 0.000 description 4
- 229920001864 tannin Polymers 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 239000003995 emulsifying agent Substances 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 239000003925 fat Substances 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 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 description 1
- 241001465754 Metazoa Species 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 239000004902 Softening Agent Substances 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
- 238000013019 agitation Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 125000002877 alkyl aryl group Chemical group 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 150000001244 carboxylic acid anhydrides Chemical group 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 125000002843 carboxylic acid group Chemical group 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 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 1
- 239000003086 colorant Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000002255 enzymatic effect Effects 0.000 description 1
- 210000004209 hair Anatomy 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 1
- 239000002195 soluble material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000000271 synthetic detergent Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000010891 toxic waste Substances 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
- 150000003754 zirconium Chemical class 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
- C14C9/00—Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes
- C14C9/02—Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes using fatty or oily materials, e.g. fat liquoring
-
- 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
- C14C13/00—Manufacture of special kinds or leather, e.g. vellum
Definitions
- the present invention relates to the treatment of raw hides for manufacturing leather destined to be used in clothing items, footwear, leather goods.
- the present invention relates to a method for manufacturing a leather having an improved combination of characteristics that make it particularly suitable for the above uses.
- the raw hides undergo a series of treatments having the aim of smoothing and cleaning them so as to make them suitable for being tanned.
- the treatments of this first manufacturing step generally include:
- the cleaned hides are tanned according to any of a variety of conventional methods.
- the hides are tanned by using a tanning agent of the mineral or vegetal type.
- the hides are first treated with a saline and acid solution (so called pickling) and then with a solution of the tanning agent (e.g. chromium sulphate) containing additives facilitating the fixing of the tanning agent to the hide.
- a saline and acid solution so called pickling
- a solution of the tanning agent e.g. chromium sulphate
- the hides are generally first treated with a solution containing tannin and suitable additives and then with an acid solution facilitating the fixing of the tannin to the hide and the removal of the residual tannin.
- a vegetal agent typically tannin
- the third manufacturing step begins, wherein the tanned hide may undergo a variety of treatments according to the final destination of use and to the desired characteristics to be conferred to the hide itself.
- the hide can be lubricated with a suitable mixture of fats and oils to improve for instance its characteristics of softness, and it can be dyed by using any of the conventional methods known to the skilled in the art.
- washing characteristics can be conferred to the hides, these characteristics giving the possibility of subjecting the hide to a washing treatment with common household means without incurring in dye release for example on possible fibres coupled with the hide itself.
- the hides also undergo a retanning treatment for introducing further additives able to confer to the hide additional characteristics, e.g. waterproofing, fulness to the touch, and/or to enhance the previously conferred characteristics.
- a retanning treatment for introducing further additives able to confer to the hide additional characteristics, e.g. waterproofing, fulness to the touch, and/or to enhance the previously conferred characteristics.
- EP 0761823 discloses a process for the production of household-machine washable and dryable, waterproof, nonflammable, and extremely colorfast leathers from wet blue hides, the process having the advantage that significantly reduced volumes of toxic wastes are generated.
- the wet blue hides are washed and treated to equalize the pH at the surface and in the interior of the leather and to build at least one wanted end characteristics such as suppleness into the leather. This is followed by the introduction of additional character builders into the pores of the hide and the substitution of one or more softening agents for fats originally present in the pores of the hide. Next there are dyeing and the fixing of previously introduced substances in the pores of the hide.
- EP 1087021 discloses a leather treatment composition (I) comprising: (a) a polysiloxane containing carboxylic acid or carboxylic anhydride groups, where the carboxylic acid groups are in neutralized form; (b) an amphiphilic copolymer prepared from hydrophilic and hydrophobic monomer units; (c) an emulsifier; and (d) an oil or wax.
- a leather treatment method involving application of (I) at 1-25 wt. % (based on the leather) from an aqueous liquor of pH 4.0-8.5 during or after retanning, leaving (I) in contact with the leather for 20-150 minutes and adjusting the pH to 3-5, preferably followed by treatment with a 2-4 valent metal salt.
- US 5658484 discloses anhydrous and water-containing agents for waterproofing leathers and furs, which comprise a silicone and as emulsifier an alkyl polyalkylol ether carboxylic acid and/or an alkylaryl polyalkylol ether carboxylic acid and/or one of their alkali, alkaline earth, ammonia, amine, or alkanolamine salts. These agents are used for waterproofing, Preferably in retanning or afterwards.
- the problem underlying the present invention is that of providing a method for manufacturing leather satisfying all the above needs.
- washable leather comprising the preparation, in a conventional way, of tanned hides starting from raw hides and characterised in that it comprises the following additional steps of:
- the method further comprises, before step b), at least one of the following steps:
- the preparation of tanned hides starting from raw hides includes the normal operations of cleaning the raw hides so as to get them ready for the tanning and the tanning treatment itself.
- the operations of cleaning the raw hides can be carried out in a conventional way by following the above described procedures, which render the hides smooth, clean and hides ready for being tanned.
- the tanning is carried out by means of a chromium tanning agent so as to obtain hides of the type known as Wet Blue.
- a chromium tanning agent so as to obtain hides of the type known as Wet Blue.
- hides can be subjected, before retanning, to a bleaching treatment with sodium hydrosulphite and oxalic acid, the latter as a reducing agent.
- bleaching treatment results being efficient to get rid of superficial dirt and thus it is preferable especially if, in the following manufacturing steps, a light dye is to be given to the hides.
- the bleaching treatment is preferably carried out by placing the hides in a conventional apparatus known as tumbler and thus by adding in sequence, the percentages by weight on the weights of the hides to be treated, 100-300% of water, preferably around 200%, 1-3%, preferably 2% by weight of anhydrous sodium hydrosulphate and 0,3-1%, preferably 0,5% of a conventional dislubricating agent chosen among fatty acids and soaps.
- the tumbler is then placed in rotation for a period of around 30-90 minutes, preferably 60 minutes and, at the end of the rotation 0,7-1,5% by weight of oxalic acid are added, preferably 1%. After having placed the tumbler again in rotation for around 30-60 minutes, preferably 40 minutes, an abundant washing with running water is then carried out.
- the retanning treatment of the hides is carried out in a conventional way, preferably by using a chromium tanning agent, e.g. powder oxide chromium.
- a chromium tanning agent e.g. powder oxide chromium.
- the retanning treatment is carried out by adding to the tumbler containing the hides to be treated, in percentages by weight on the weight of the hides, 50-200% of water, preferably around 100%, 5-6% of chromium oxide and 0,5-0,6% of sodium bicarbonate. Then the tumbler is placed in rotation for a period of 2-4 hours, preferably 3 hours and at the end of the rotation an abundant washing with running water is carried out.
- the enhancement of the pH of the retanned hides is preferably carried out by adding to the tumbler containing hides, in percentages by weight on the weight of the hides to be treated, 50-200% of water, preferably around 100% and 1,5-3%, preferably 2% of ammonium bicarbonate (pH regulator) so as to enhance the pH to a value of 6-7. Then the tumbler is placed in rotation for a period of 60-120 minutes, preferably 90 minutes and, at the end of the rotation an abundant washing with running water is carried out.
- pH regulator ammonium bicarbonate
- the enhancement of the acid pH typical of the retanned hides to a value around the neutrality advantageously allows to prepare the hides in the best way for the subsequent treating steps and it results to be particularly suitable for obtaining a good softness of the hides in said subsequent steps.
- the optional treatment of the retanned hides with the mixture of acrylic resins is preferably carried out in the tumbler containing the hides to be treated by adding therein, in percentages by weight on weight of the hides, 100-300% of water, preferably around 200% and 3-5% of a watery solution of acrylic resins.
- the tumbler is placed in rotation for a peroiod of 30-90 minutes, preferably 60 minutes and, at the end of the rotation, an abundant washing with running water is carried out.
- the acrylic resins useful in the method according to the invention are composed of polymers and co-polymers of the methacrylic acid, the percentage by weight of the resins in the solution is of around 40% and the pH of the solution is comprised between 4,2 and 5,5.
- the treatment of the retanned hides with the mixture of acrylic resins advantageously confers to the hide the proper degree of fulness to touch.
- step b A very important aspect of the present invention is given by the lubrication step (step b).
- such lubrication step is carried out by treating the hides in a tumbler with an emulsion obtained by mixing under agitation 70-90 parts by weight on the total weight of the emulsion of an organic phase constituted of hydrophobic synthetic oils and 10-30 parts by weight of a watery phase constituted of an emulsion of silicone compounds.
- the hydrophobic synthetic oils constituting the organic phase preferably have anionic character, i.e. they comprise anionic organic units.
- a preferred product for the organic phase is sold by Dermacolor s.r.1. with the name of DERMADOL W 300 and it comprises a mixture of syntetical oils able to confer waterproofing to the hide.
- the silicone compounds constituting the emulsion of the watery phase are chosen from the group comprising silane and siloxane compounds and respective polymeric products of condensation.
- a preferred product for the watery phase is constituted of a watery emulsion of dimethylpolysiloxane.
- the emulsion used in the lubricating process is prepared in situ and it is used in percentages by weight on the weight of the hides to be treated comprised between 8% and 15%.
- the tumbler is placed in rotation for a period of 60-120 minutes, preferably 90 minutes and, at the end of the rotation, an abundant washing with running water is carried out.
- the above specified lubricating treatment confers to the hides characteristics of softness, waterproofing, transpiration and elasticity desired for the final application.
- the lubricated hides as specified above are dryed in a conventional way, e.g. by means of vaccum applications and windy conditioning for then being selected for the following manufacturing steps.
- step c before subjecting the selected hides to dyeing (step c), it is preferred to carry out on the same a second lubricating treatment with the same emulsion used for the first lubrication.
- the emulsion is used in proportions from 2% to 8% by weight on the weight of the dryed hides.
- This second lubricating treatment allows to improve, i.e. enhancing, the characteristics of softness, waterproofing/transpiration and elasticity already conferred to the hides in the previous lubrication.
- the lubricated hides (in one or two steps as specified above) are then subjected to the dyeing treatment.
- the dyeing is carried out by adding to the hides to be dyed placed in a tumbler, 100-300% by weight on the weight of the hides of water and 1-6% by weight of a dyeing agent of a conventional type chosen according to the colour which is to be conferred to the final hide.
- the tumbler is then placed in rotation according to the normal dyeing times.
- the hides are further treated with a solution containing 1-3% by weight of cationic acrylic resins.
- These resins act as auxiliaries for dyeing, facilitating the fixing of the chosen dyeing agent to the hide and thus allow the improvement of the characteristics of fastness of the colour.
- the dyeing is generally completed by a fixing step which allows to bind permanently in the pores of the hides all the chemical products used in the previous treatments (es. lubrication and dyeing).
- the silicone compounds are preferably chosen from the group comprising silane and siloxane compounds and their respective polymeric products of condensation whereas the nature of the metallic salts varies according to the chosen dyeing agent.
- Suitable metallic salts are chosen among chromium, aluminium and zirconium salts.
- the fixing treatment is carried out by adding in the tumbler containing the dyed hides, in percentages by weight on the weight of the hides, 100-300% of water, preferably 200%, 0,5-3% of silicone emulsion and 3-6% of metallic salts.
- the leather obtained with the method according to the invention has high qualities and characteristics of softness, waterproofing, transpiration, elesticity, fulness to touch, colour fastnessand stability, washability, fastness to light and to fading, which fully satisfy the standards required by the international rules in this field.
- the leather obtained according to the invention has mean values on the scale of the grey in the range of 4-5 as determined according to the international rule IUF 423.
- samples of dyed leather are coupled with particular non-dyed fabrics, agitated in a neutral solution of synthetic detergent and then rinsed and dryed.
- variations of colour on the samples as well as the degree of migration of the colour on the accompanying fabrics are evaluated by comparing them with the scale of the grey.
- the results are then expressed in values of the scale of the grey variable from 1 to 5 wherein a significant bleaching of the hide and/or a significant migration of the colour from the hide to the coupling fabric correspond to the minimum value of 1 whereas the maximum value of 5 is given to a leather that, at the end of the test, has no variation of the colour of the leather and/or colouring of the accompanying fabric.
- the leather according to the invention also has improved characteristics of transpiration and waterproofing.
- measures on samples of leather carried out on according to the international rule IUP 15 have shown transpiration values (i.e. permeability to water vapour) higher or equal to 10 mg/cm 2 h and generally comprised between 10 and 15 mg/cm 2 h.
- measures on samples of leather carried out according to the international rule IUP 10 have shown values of resistance to the penetration of water comprised between 90 and 120 minutes with absorption of water varying from 10% to 15% by weight on the weight of the examined sample of leather.
- the leather obtained according to the method of the invention also has excellent elasticity characteristics.
- a breaking load higher or equal to 12 N/mm 2 and a stretch higher or equal to 40% have been detected.
- the main advantage of the leather obtained through the method according to the invention lies in the fact that it can be efficiently subjected to washing with neutral detergent at a temperature of around 40°C without any substantial structural alteration of the hide (e.g. loss of elasticity and/or shrinking) and of the softness, and without any release and variation of colour.
- the leather obtained according to the invention is advantageously suitable for being used as it is alone or coupled to other natural or synthetic fibres for manufacturing washable items, e.g in the field of clothing, footwear, leather goods and furnishing.
- the leather does not need further specific finishing treatments.
- the method according to the invention is efficiently appliable to all the raw hides of natural origin with particular reference to bovine and ovogoaty hides.
Abstract
Description
- In its more general aspect, the present invention relates to the treatment of raw hides for manufacturing leather destined to be used in clothing items, footwear, leather goods.
- In particular, the present invention relates to a method for manufacturing a leather having an improved combination of characteristics that make it particularly suitable for the above uses.
- Several methods for manufacturing leather from raw animal hides are known in the art. As a general rule, these methods comprise three manufacturing steps.
- In the first manufacturing step, the raw hides undergo a series of treatments having the aim of smoothing and cleaning them so as to make them suitable for being tanned.
- The treatments of this first manufacturing step generally include:
- soaking the preserved hides in water in order to recover the umidity lost during their conservation and to remove water-soluble materials such as salts, blood.
- dehairing and liming by treating the hides in suitable dressings with calcium hydroxide and sodium sulphide,
- deliming, i.e. treating the hides with weak acid solutions or salts thereof in order to remove the residual calcium hydroxide,
- treating the hides with enzymatic products (so called "bating") with the aim of removing residual parts (residual hairs and relevant roots) thus smoothing and cleaning the hides and making them suitable for being tanned.
- In the second manufacturing step, the cleaned hides are tanned according to any of a variety of conventional methods. Typically the hides are tanned by using a tanning agent of the mineral or vegetal type. In the tanning with a mineral agent, the hides are first treated with a saline and acid solution (so called pickling) and then with a solution of the tanning agent (e.g. chromium sulphate) containing additives facilitating the fixing of the tanning agent to the hide.
- Instead, in the tanning with a vegetal agent (typically tannin), the hides are generally first treated with a solution containing tannin and suitable additives and then with an acid solution facilitating the fixing of the tannin to the hide and the removal of the residual tannin.
- At this stage the third manufacturing step begins, wherein the tanned hide may undergo a variety of treatments according to the final destination of use and to the desired characteristics to be conferred to the hide itself. For example the hide can be lubricated with a suitable mixture of fats and oils to improve for instance its characteristics of softness, and it can be dyed by using any of the conventional methods known to the skilled in the art.
- According to the used dyeing method, also washing characteristics can be conferred to the hides, these characteristics giving the possibility of subjecting the hide to a washing treatment with common household means without incurring in dye release for example on possible fibres coupled with the hide itself.
- In some cases, the hides also undergo a retanning treatment for introducing further additives able to confer to the hide additional characteristics, e.g. waterproofing, fulness to the touch, and/or to enhance the previously conferred characteristics.
- Although a great deal of methods for treating raw hides for obtaining a leather having one or more characteristics chosen for example among softness, fulness to the touch, waterproofing, washability, elasticity, colour fastness, are thus available to the skilled in the art, it is anyway difficult at present to manufacture a leather having a suitable combination of these characteristics.
- In fact, the suitable conferment of these characteristics to the final leather is reached only by accurately controlling a complex series of variables involved by the manufacturing method among which the nature of the additives and solutions used in the various manufacturing steps, pH of the treatment solutions, treatment times.
-
EP 0761823 discloses a process for the production of household-machine washable and dryable, waterproof, nonflammable, and extremely colorfast leathers from wet blue hides, the process having the advantage that significantly reduced volumes of toxic wastes are generated. The wet blue hides are washed and treated to equalize the pH at the surface and in the interior of the leather and to build at least one wanted end characteristics such as suppleness into the leather. This is followed by the introduction of additional character builders into the pores of the hide and the substitution of one or more softening agents for fats originally present in the pores of the hide. Next there are dyeing and the fixing of previously introduced substances in the pores of the hide. This is followed by refloatation with a hydrophobic waterproofing agent and buffering for pH equalization and increase of the pH. The hides are next treated to impart a pleasing, silky feel to the leather into which the hides are being converted and a hydrophobic silicone which promotes waterproofability and washability; and this is followed by a second fixing step. -
EP 1087021 discloses a leather treatment composition (I) comprising: (a) a polysiloxane containing carboxylic acid or carboxylic anhydride groups, where the carboxylic acid groups are in neutralized form; (b) an amphiphilic copolymer prepared from hydrophilic and hydrophobic monomer units; (c) an emulsifier; and (d) an oil or wax. There is also disclosed a leather treatment method involving application of (I) at 1-25 wt. % (based on the leather) from an aqueous liquor of pH 4.0-8.5 during or after retanning, leaving (I) in contact with the leather for 20-150 minutes and adjusting the pH to 3-5, preferably followed by treatment with a 2-4 valent metal salt. -
US 5658484 discloses anhydrous and water-containing agents for waterproofing leathers and furs, which comprise a silicone and as emulsifier an alkyl polyalkylol ether carboxylic acid and/or an alkylaryl polyalkylol ether carboxylic acid and/or one of their alkali, alkaline earth, ammonia, amine, or alkanolamine salts. These agents are used for waterproofing, Preferably in retanning or afterwards. - There is thus the need of providing a method for manufacturing leather allowing to confer to the finished product improved characteristics with respect to those conferred by state-of-the-art methods. In particular, there exist the need of providing a washable dyed leather having at the same time good characteristics of softness, fulness to the touch, fastness of the colour, waterproofing and elesticity.
- The problem underlying the present invention is that of providing a method for manufacturing leather satisfying all the above needs.
- Such a problem is solved, according to the invention, by a method for manufacturing washable leather comprising the preparation, in a conventional way, of tanned hides starting from raw hides and characterised in that it comprises the following additional steps of:
- a) subjecting the tanned hides to retanning,
- b) subjecting said retanned hides to at least a lubrification treatment with an emulsion obtained by mixing 70-90 parts by weight of an organic phase constituted of synthetic hydrophobic oils and 10-30 parts by weight of a watery phase constituted of an emulsion of silicone compounds.
- c) subjecting said retanned and lubricated hides to dyeing with a dyeing agent possibly in association with cationic acrylic resins,
- d) subjecting the dyed hides obtained by step c) to a fixing treatment with a watery emulsion comprising silicone compounds and with metallic salts.
- According to an embodiment of the invention, the method further comprises, before step b), at least one of the following steps:
- treating said retanned hides with a pH regulating agent so as to enhance the pH to a value of around 6-7,
- treating said retanned hides possibly after having enhanced their pH to 6-7 with a watery solution or watery suspension of acrylic resins.
- In the method according to the invention, the preparation of tanned hides starting from raw hides includes the normal operations of cleaning the raw hides so as to get them ready for the tanning and the tanning treatment itself.
- The operations of cleaning the raw hides can be carried out in a conventional way by following the above described procedures, which render the hides smooth, clean and hides ready for being tanned.
- Preferably, the tanning is carried out by means of a chromium tanning agent so as to obtain hides of the type known as Wet Blue. Such hides can be subjected, before retanning, to a bleaching treatment with sodium hydrosulphite and oxalic acid, the latter as a reducing agent. Such bleaching treatment results being efficient to get rid of superficial dirt and thus it is preferable especially if, in the following manufacturing steps, a light dye is to be given to the hides.
- In the method according to the invention, the bleaching treatment is preferably carried out by placing the hides in a conventional apparatus known as tumbler and thus by adding in sequence, the percentages by weight on the weights of the hides to be treated, 100-300% of water, preferably around 200%, 1-3%, preferably 2% by weight of anhydrous sodium hydrosulphate and 0,3-1%, preferably 0,5% of a conventional dislubricating agent chosen among fatty acids and soaps.
- The tumbler is then placed in rotation for a period of around 30-90 minutes, preferably 60 minutes and, at the end of the rotation 0,7-1,5% by weight of oxalic acid are added, preferably 1%. After having placed the tumbler again in rotation for around 30-60 minutes, preferably 40 minutes, an abundant washing with running water is then carried out.
- In the method according to the invention, the retanning treatment of the hides, possibly having already been subjected to the above described bleaching treatment, is carried out in a conventional way, preferably by using a chromium tanning agent, e.g. powder oxide chromium.
- Preferably, the retanning treatment is carried out by adding to the tumbler containing the hides to be treated, in percentages by weight on the weight of the hides, 50-200% of water, preferably around 100%, 5-6% of chromium oxide and 0,5-0,6% of sodium bicarbonate. Then the tumbler is placed in rotation for a period of 2-4 hours, preferably 3 hours and at the end of the rotation an abundant washing with running water is carried out.
- In the method according to the invention, the enhancement of the pH of the retanned hides is preferably carried out by adding to the tumbler containing hides, in percentages by weight on the weight of the hides to be treated, 50-200% of water, preferably around 100% and 1,5-3%, preferably 2% of ammonium bicarbonate (pH regulator) so as to enhance the pH to a value of 6-7. Then the tumbler is placed in rotation for a period of 60-120 minutes, preferably 90 minutes and, at the end of the rotation an abundant washing with running water is carried out.
- The enhancement of the acid pH typical of the retanned hides to a value around the neutrality advantageously allows to prepare the hides in the best way for the subsequent treating steps and it results to be particularly suitable for obtaining a good softness of the hides in said subsequent steps.
- In the method according to the invention, the optional treatment of the retanned hides with the mixture of acrylic resins is preferably carried out in the tumbler containing the hides to be treated by adding therein, in percentages by weight on weight of the hides, 100-300% of water, preferably around 200% and 3-5% of a watery solution of acrylic resins.
- Then the tumbler is placed in rotation for a peroiod of 30-90 minutes, preferably 60 minutes and, at the end of the rotation, an abundant washing with running water is carried out.
- Preferably, the acrylic resins useful in the method according to the invention are composed of polymers and co-polymers of the methacrylic acid, the percentage by weight of the resins in the solution is of around 40% and the pH of the solution is comprised between 4,2 and 5,5.
- The treatment of the retanned hides with the mixture of acrylic resins advantageously confers to the hide the proper degree of fulness to touch.
- A very important aspect of the present invention is given by the lubrication step (step b). In accordance with the present invention, such lubrication step is carried out by treating the hides in a tumbler with an emulsion obtained by mixing under agitation 70-90 parts by weight on the total weight of the emulsion of an organic phase constituted of hydrophobic synthetic oils and 10-30 parts by weight of a watery phase constituted of an emulsion of silicone compounds.
- The hydrophobic synthetic oils constituting the organic phase preferably have anionic character, i.e. they comprise anionic organic units. A preferred product for the organic phase is sold by Dermacolor s.r.1. with the name of DERMADOL W 300 and it comprises a mixture of syntetical oils able to confer waterproofing to the hide.
- The silicone compounds constituting the emulsion of the watery phase are chosen from the group comprising silane and siloxane compounds and respective polymeric products of condensation. A preferred product for the watery phase is constituted of a watery emulsion of dimethylpolysiloxane.
- Preferably, the emulsion used in the lubricating process is prepared in situ and it is used in percentages by weight on the weight of the hides to be treated comprised between 8% and 15%. After adding the emulsion to the hides, the tumbler is placed in rotation for a period of 60-120 minutes, preferably 90 minutes and, at the end of the rotation, an abundant washing with running water is carried out.
- The above specified lubricating treatment confers to the hides characteristics of softness, waterproofing, transpiration and elasticity desired for the final application.
- The lubricated hides as specified above are dryed in a conventional way, e.g. by means of vaccum applications and windy conditioning for then being selected for the following manufacturing steps.
- In accordance with a preferred embodiment of the invention, before subjecting the selected hides to dyeing (step c), it is preferred to carry out on the same a second lubricating treatment with the same emulsion used for the first lubrication.
- Preferably, for the second lubrication treatment the emulsion is used in proportions from 2% to 8% by weight on the weight of the dryed hides.
- This second lubricating treatment allows to improve, i.e. enhancing, the characteristics of softness, waterproofing/transpiration and elasticity already conferred to the hides in the previous lubrication.
- In the method according to the invention, the lubricated hides (in one or two steps as specified above) are then subjected to the dyeing treatment.
- In accordance with the invention, the dyeing is carried out by adding to the hides to be dyed placed in a tumbler, 100-300% by weight on the weight of the hides of water and 1-6% by weight of a dyeing agent of a conventional type chosen according to the colour which is to be conferred to the final hide. The tumbler is then placed in rotation according to the normal dyeing times.
- In accordance with a preferred embodiment of the invention, in the dyeing step, the hides are further treated with a solution containing 1-3% by weight of cationic acrylic resins.
- These resins act as auxiliaries for dyeing, facilitating the fixing of the chosen dyeing agent to the hide and thus allow the improvement of the characteristics of fastness of the colour.
- The dyeing is generally completed by a fixing step which allows to bind permanently in the pores of the hides all the chemical products used in the previous treatments (es. lubrication and dyeing).
- In the method according to the invention, carrying out the fixing by treating the hides in a tumbler with a watery emulsion comprising silicone compounds and with metallic salts has resulted advatageous.
- The silicone compounds are preferably chosen from the group comprising silane and siloxane compounds and their respective polymeric products of condensation whereas the nature of the metallic salts varies according to the chosen dyeing agent. Suitable metallic salts are chosen among chromium, aluminium and zirconium salts.
- Preferably, the fixing treatment is carried out by adding in the tumbler containing the dyed hides, in percentages by weight on the weight of the hides, 100-300% of water, preferably 200%, 0,5-3% of silicone emulsion and 3-6% of metallic salts.
- The leather obtained with the method according to the invention has high qualities and characteristics of softness, waterproofing, transpiration, elesticity, fulness to touch, colour fastnessand stability, washability, fastness to light and to fading, which fully satisfy the standards required by the international rules in this field.
- In particular, as regards the characteristic of colour fastness, which is strictly correlated with washability, it has surprisingly been discovered that the leather obtained according to the invention has mean values on the scale of the grey in the range of 4-5 as determined according to the international rule IUF 423.
- According to this international rule, samples of dyed leather are coupled with particular non-dyed fabrics, agitated in a neutral solution of synthetic detergent and then rinsed and dryed. At this stage the variations of colour on the samples as well as the degree of migration of the colour on the accompanying fabrics are evaluated by comparing them with the scale of the grey. The results are then expressed in values of the scale of the grey variable from 1 to 5 wherein a significant bleaching of the hide and/or a significant migration of the colour from the hide to the coupling fabric correspond to the minimum value of 1 whereas the maximum value of 5 is given to a leather that, at the end of the test, has no variation of the colour of the leather and/or colouring of the accompanying fabric.
- In the case of the leather obtained according to the method of the invention, from washing tests on samples coloured with 50 different colours and associated with accompanying fabrics having fibres of materials chosen among cellulose acetate, cotton, nylon, polyesther, acrilic fibres and wool, mean values have been detected in the range 4-5 both as regards the colour variation of the hide (colour fastness) and the dyeing of the accompanying fabric.
- The leather according to the invention also has improved characteristics of transpiration and waterproofing. As regards transpiration, measures on samples of leather carried out on according to the international rule IUP 15 have shown transpiration values (i.e. permeability to water vapour) higher or equal to 10 mg/cm2 h and generally comprised between 10 and 15 mg/cm2 h.
- Instead, as regards waterproofing, measures on samples of leather carried out according to the international rule IUP 10 have shown values of resistance to the penetration of water comprised between 90 and 120 minutes with absorption of water varying from 10% to 15% by weight on the weight of the examined sample of leather.
- The leather obtained according to the method of the invention also has excellent elasticity characteristics. In fact, from measures of resistance to the traction (e.g. by means of the rules ISO 3376 or IUP 6) a breaking load higher or equal to 12 N/mm2 and a stretch higher or equal to 40% have been detected.
- Without being linked to any scientific theory it is believed that the improvement of all these characteristics is reached thanks to the peculiarity of the treatment steps of the hides provided in the method according to the invention and to the peculiarity of the chemical compositions used in these treatment steps.
- More particularly, it is believed that the improved characterstics of colour fastness, washability, fastness to light and to fading (characteristics strictly connected one another) are reached thanks to the use, during the dyeing steps, of dyeing agents selected together in association with cationic acrylic resins as auxiliaries of dyeing and of the peculiarity of the fixing of said agents to the hide.
- In particular, the use of the above dyeing agents together with the auxiliaries of dyeing in the above described ways would allow the dyes themselves to adequately penetrate into the pores of the hides whereas by means of the fixing said dyes would form very strong chemical bonds with the hides in correspondence with active sites in their pores.
- Instead, as regards the improvement of the characteristics of softness, waterproofing, transpiration and elesticity it is believed that such improvement is reached thanks to the use of the particular emulsions with their oily and watery phases used in the lubricating steps.
- In particular, the use of these particular emulsions in the above indicated proportions and modes would allow a sufficient and uniform penetration of the hide by the fatty substances contained in the emulsions, which fatty substances would thus form interactions of various type with the collagene matrix of the hide. The bond among fatty substances of the hide would be then highly reinforced during the fixing treatment thus ensuring to the hide the desired characteristics of softness, transpiration, waterproofing and elesticity.
- The main advantage of the leather obtained through the method according to the invention lies in the fact that it can be efficiently subjected to washing with neutral detergent at a temperature of around 40°C without any substantial structural alteration of the hide (e.g. loss of elasticity and/or shrinking) and of the softness, and without any release and variation of colour.
- Therefore, the leather obtained according to the invention is advantageously suitable for being used as it is alone or coupled to other natural or synthetic fibres for manufacturing washable items, e.g in the field of clothing, footwear, leather goods and furnishing.
- In this use, advantageously the leather does not need further specific finishing treatments.
- The method according to the invention is efficiently appliable to all the raw hides of natural origin with particular reference to bovine and ovogoaty hides.
Claims (16)
- A method for manufacturing washable leather comprising the preparation, in a conventional way, of tanned hides starting from raw hides and characterised in the fact that it comprises the additional steps of:a) subjecting the tanned hides to retanning,b) subjecting said retanned hides to at least a lubricating treatment with an emulsion obtained by mixing 70-90 parts by weight of an organic phase constituted of synthetic hydrophobic oils and 10-30 parts by weight of a watery phase constituted of an emulsion of silicone compounds,c) subjecting said retanned and lubricated hides to dyeing with a dyeing agent possibly in association with cationic acrylic resins,d) subjecting the dyed hides obtained from step c) to a fixing treatment with a watery emulsion comprising silicone compounds and metallic salts.
- A method according to claim 1, further comprising before step b), at least one of the following steps:- treating said retanned hides with a pH regulating agent so as to enhance the pH to a value of around 6-7,- treating said retanned hides possibly after having enhanced their pH to 6-7 with a watery solution of acrylic resins.
- A method according to claim 1 or claim 2, wherein said retanning step is carried out by treating the tanned hides in a watery bath comprising the following ingredients in percentages by weight on the weight of the hides:50-200% water,5-6% cromium oxide0,5-0,6% sodium bicarbonate.
- A method according to any of the previous claims, wherein two lubricating steps of said retanned hides are provided by means of a treatment of the same respectively with 8-15% and 2-8% by weight on the weight of the hides of said emulsion obtained by mixing 70-90 parts by weight of an organic phase constituted of synthetic hydrophobic oils and 10-30 parts by weight of a watery phase constituted of an emulsion of silicone compounds.
- A method according to claim 4, wherein said synthetic oils comprise anionic organic units.
- A method according to claim 4 or claim 5, wherein said silicone compounds are chosen from the group comprising silane and siloxane compounds and respective polymeric products of condensation.
- A method according to any of the claims from 4 to 6, wherein said watery phase is constituted of an emulsion of dimethylpolysiloxane.
- A method according to any of the previous claims, wherein said dyeing step is carried out by treating said retanned and lubricated hides in a watery bath comprising the following ingredients in percentages by weight on the weight of the hides:100-300% water1-6% dyeing agent1-3% cationic acrylic resins.
- A method according to any of the previous claims, wherein said fixing step is carried out by treating the dyed hides in a watery bath comprising the following ingredients in percentages by weight on the weight of the hides:100-300% water0,5-3% emulsion comprising silicone compounds3-6% metallic salts.
- A method according to any of the claims 2 to 9, wherein said treating step of the hides retanned with a pH regulating agent is carried out in a watery bath comprising the following ingredients in percentages by weight on the weight of the hides:50-200% water,1,5-3% ammonium bicarbonate.
- A method according to any of the claims 2 to 10, wherein said treating step of the hides retanned with a watery solution of acrylic resins is carried out in a watery bath comprising the following ingredients in peercentages by weight on the weight of the hides:100-300 % water,3-5% watery solution of acrylic resins.
- A method according to any of the previous claims, wherein the conventional preparation of the tanned hides provides the use of a chromium tanning agent so as to obtain Wet Blue hides.
- A method according to any of the previous claims, further comprising before the retanning step (step a), the step of subjecting the tanned hides to a bleaching treatment with sodium hydrosulphite and oxalic acid.
- A method according to claim 13, wherein said bleaching treatment of the retanned hides is carried out in a watery bath comprising the following ingredients in percentages by weight on the weight of the hides:100-300% water1-3% sodium hydrosulphite0,3-1% dislubricating agent chosen among fatty acids and soaps.0,7-1,5% oxalic acid.
- Use of a washable leather obtained by the method according to any of the claims 1 to 14 in the manufacturing of clothing items, footwear, leather goods and furnishing.
- Chemical composition for use in the lubricating treatment of retanned hides consisting of 70-90% by weight on the weight of the composition of an organic phase constituted of synthetic hydrophobic oils and 10-30% by weight on the weight of the composition of a watery phase constituted of an emulsion of silicone compounds, said organic and watery phases being mixed one another before said use in order to form an emulsion.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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AT03425647T ATE451479T1 (en) | 2003-10-03 | 2003-10-03 | METHOD OF PRODUCING LEATHER |
EP03425647A EP1520911B1 (en) | 2003-10-03 | 2003-10-03 | Method for manufacturing leather |
DE60330458T DE60330458D1 (en) | 2003-10-03 | 2003-10-03 | Method of making leather |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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EP03425647A EP1520911B1 (en) | 2003-10-03 | 2003-10-03 | Method for manufacturing leather |
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EP1520911A1 EP1520911A1 (en) | 2005-04-06 |
EP1520911B1 true EP1520911B1 (en) | 2009-12-09 |
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EP03425647A Expired - Lifetime EP1520911B1 (en) | 2003-10-03 | 2003-10-03 | Method for manufacturing leather |
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EP (1) | EP1520911B1 (en) |
AT (1) | ATE451479T1 (en) |
DE (1) | DE60330458D1 (en) |
Families Citing this family (6)
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CN100378269C (en) * | 2005-08-04 | 2008-04-02 | 中国皮革和制鞋工业研究院 | Leather-making used dyeing filler and preparation thereof |
CN101713004B (en) * | 2009-11-18 | 2012-09-05 | 华斯农业开发股份有限公司 | Method for curling fine fur |
CN102586507A (en) * | 2012-03-21 | 2012-07-18 | 陕西科技大学 | Method for preparing acrylic resin modified graphene oxide leather tanning agent |
CN113454283A (en) * | 2018-12-21 | 2021-09-28 | 伊科斯克有限公司 | Method for dyeing collagen short fiber |
CN114541128A (en) * | 2021-12-15 | 2022-05-27 | 浙江中辉裘革科技有限公司 | Bleaching treatment process for sheep skin fur leather raw skin |
CN116397056B (en) * | 2023-05-09 | 2024-02-20 | 辛集市凌爵皮革有限责任公司 | Processing technology and application of washable waterproof sheep leather |
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DE4415062B4 (en) | 1994-04-29 | 2004-04-01 | Stockhausen Gmbh & Co. Kg | Means and processes for waterproofing leather and furs |
US5972037A (en) | 1995-07-26 | 1999-10-26 | Scheen Industries, Inc | Leather tanning processes and the products thereof |
ATE246732T1 (en) | 1999-09-18 | 2003-08-15 | Trumpler Gmbh & Co Chem Fab | LEATHER TREATMENT PRODUCTS |
-
2003
- 2003-10-03 AT AT03425647T patent/ATE451479T1/en not_active IP Right Cessation
- 2003-10-03 DE DE60330458T patent/DE60330458D1/en not_active Expired - Lifetime
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ATE451479T1 (en) | 2009-12-15 |
DE60330458D1 (en) | 2010-01-21 |
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