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
• • 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
  • C14C1/02—Curing raw hides
• • 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

Definitions

• the present invention relates to a method of treating skins and the skins thus treated.
• It relates more particularly to a treatment making it possible to ensure better conservation from a biological point of view thereof, in particular during the process of preparation thereof before or after their tanning.
• skins are generally marketed in different forms: - in the raw state (salted, brined, salted - dry and fresh, etc 7) - in the pickled state (treatment with a strong acid solution in the presence of salt) - in the reversible pretanned state (BSH or BSS, wet white, dry white, for example) - in the tanned state (for example by a treatment with chromium) - in the semi-worked state (called "stain”) - or in the finished state.
• BSH or BSS reversible pretanned state
• stain semi-worked state
• products or compositions comprising compounds with antifungal or anti-bacterial action such as, for example, tri or pentachlorophenols, paramethacresol, orthophenyphenol and their sodium salts, benzothiazole derivatives (for example, TCMTB), isothiazolones, metal salts such as zinc or copper salts.
• compounds with antifungal or anti-bacterial action such as, for example, tri or pentachlorophenols, paramethacresol, orthophenyphenol and their sodium salts, benzothiazole derivatives (for example, TCMTB), isothiazolones, metal salts such as zinc or copper salts.
• waste water treatment processes biological treatment
• these products can also be annoying in the development of skins after tanning, for example.
• the object of the invention is in particular to remedy these drawbacks by proposing a method for treating the skins to protect them from fungal or bacterial attacks, capable of being applied at all stages or stages of the method for producing a skin.
• the invention provides a method of treating skins to protect them from fungal and / or bacterial attacks, consisting in treating them with a treatment bath comprising at least one lanthanum or cerium salt.
• lanthanum or cerium salts any salt soluble in water such as mineral salts such as nitrates, chlorides, sulfates, for example, organic salts or organosulfonic or gluconate salts.
• the lanthanum or cerium salts are organic salts derived from a vinyl carboxylic acid such as, for example, acrylic acid, methacrylic acid.
• the preferred salts of the invention are the lanthanum acrylates and methacrylates.
• the skins are treated with an amount of lanthanum or cerium expressed in oxide of between 0.02 and 1.25%, preferably between 0.04% and 1.25%.
• the salt is a vinyl carboxylic acid salt
• free vinyl carboxylic acid is added to the treatment solution.
• the amount of vinyl anion or of vinyl acid expressed as free vinyl acid is advantageously between 0.5% and 5% of skin in guts, preferably between 1% and 3%.
• This treatment bath can be used alone or in combination with a skin treatment bath, such as for example the pickling, tanning or pre-tanning baths such as the BSH or BSS baths, described for example in French patent no. 2 610 643 from the Technical Center for Leather Shoes and Leather Goods.
• a skin treatment bath such as for example the pickling, tanning or pre-tanning baths such as the BSH or BSS baths, described for example in French patent no. 2 610 643 from the Technical Center for Leather Shoes and Leather Goods.
• This antifungal and antibacterial treatment bath is particularly suitable for treating tanned skins in order to preserve them against molds which damage their appearance.
• the treatment bath according to the invention preserves the skin against attack by fungi such as, for example, aspergillus niger, penicillium funiculosum, rhizopus nigricans, trichoderma viride or bacteria bacilus subtilis, escherichia coli.
• fungi such as, for example, aspergillus niger, penicillium funiculosum, rhizopus nigricans, trichoderma viride or bacteria bacilus subtilis, escherichia coli.
• Another advantage of the process of the invention lies in the fact that the treatment agent does not become fixed irreversibly on the skin fiber and therefore can be easily removed by washing.
• lanthanum or cerium are not harmful and therefore can be discharged into waste water.
• the method of the invention can be implemented by any known means and for example by impregnation with a treatment bath by passing through a fuller.
• the invention also relates to skins treated according to the method of the invention and comprising lanthanum and / or cerium.
• the treated skins comprise from 0.02% to 1.2% of lanthanum or cerium expressed relative to the weight of dry matter, that is to say after drying in a ventilated oven for 6 hours at 105 ° C and drying at this temperature at constant weight.
• the treated skins also include vinyl units either in monomeric form or in polymerized form.
• the skin was divided into strips which were then treated with stabilization baths to obtain B.S.H.
• This stabilization treatment consists in adding to the pickling solution after neutralization 2% (tripe weight) of aluminum polychlorosulfate (i.e. 0.16% expressed as AllO3) in the form of an aqueous solution having a basicity of 55%, a desulfation rate of 82% and an Al2O3 content of 8.3% obtained according to the process described in European patent application No. 218487.
• aluminum polychlorosulfate i.e. 0.16% expressed as AllO3
• an antifungal and / or antiseptic treatment agent was added to the stabilization bath, with neutralization of the bath to obtain a pH equal to approximately 4.
• a conventional antiseptic agent marketed under the trade name "Busan 30" is added to the stabilization bath to have a concentration of 0.07% relative to the weight of tripe.
• control strip No. 1 is invaded by mold both in the full-thickness leather and in the split flower.
• Tests of skin contamination by molds were carried out in a PETRI box, on small leather samples seeded with microbial cells, at the rate of 1 ⁇ 105 cells per cm2 of leather.
• the sample thus sown is placed in an agar medium poured into a PETRI box and itself sown with the suspension of corresponding microbial molds.
• the whole is incubated at 30 ° C. in a thermostatically controlled oven.
• a leather tanned with chromium salts and commonly called “wet-blue” leather, is impregnated with a solution containing an antibacterial compound either in accordance with the invention, or by way of comparison with a known compound and commonly used, namely a derivative of benzothiazole marketed under the name "BUSAN".
• the lanthanum content, expressed as lanthanum oxide, or the busan content is 0.4%
• the results are collated in the attached table: ANTIBACTERIAL COMPOSITION % INVASION OF THE SAMPLE AFTER 3 DAYS 6 DAYS 12 DAYS 16 DAYS 27 DAYS - 50% 100% 100% 100% 100% LANTHANE XYLENE SULFONATE 10% 60% 80% 80% 80% LANTHANE GLUCONATE 5% 60% 80% 80% 80% LANTHANE SULFATE 5% 80% 80% 100% 100% LANTHANE ACRYLATE 0% 5% 40% 40% 60% LANTHANE ACRYLATE + ACRYLIC ACID 0% 5% 5% 15% BUSAN 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0%

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)
• Agricultural Chemicals And Associated Chemicals (AREA)
• Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
• Polishing Bodies And Polishing Tools (AREA)
• Stringed Musical Instruments (AREA)
• Disintegrating Or Milling (AREA)
• Pinball Game Machines (AREA)
• Adornments (AREA)
• Treatments Of Macromolecular Shaped Articles (AREA)
• Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
• Treatment Of Fiber Materials (AREA)
• Ink Jet Recording Methods And Recording Media Thereof (AREA)
• Chemical And Physical Treatments For Wood And The Like (AREA)
• Superconductors And Manufacturing Methods Therefor (AREA)
• Crystals, And After-Treatments Of Crystals (AREA)
• Glass Compositions (AREA)
• Materials For Medical Uses (AREA)
• Gloves (AREA)
• Laminated Bodies (AREA)
• Silver Salt Photography Or Processing Solution Therefor (AREA)

Applications Claiming Priority (2)

Publications (2)

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ID=9384240

Family Applications (1)

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Cited By (1)

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Citations (2)

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• 1989
  • 1989-07-28 FR FR8910195A patent/FR2650294B1/fr not_active Expired - Lifetime
• 1990
  • 1990-07-23 AT AT90402108T patent/ATE124727T1/de not_active IP Right Cessation
  • 1990-07-23 EP EP90402108A patent/EP0410862B1/de not_active Expired - Lifetime
  • 1990-07-23 DE DE69020659T patent/DE69020659D1/de not_active Expired - Lifetime
  • 1990-07-23 NZ NZ234621A patent/NZ234621A/en unknown
  • 1990-07-25 CN CN90106961A patent/CN1049527A/zh active Pending
  • 1990-07-26 CS CS903729A patent/CS277501B6/cs unknown
  • 1990-07-26 ZA ZA905879A patent/ZA905879B/xx unknown
  • 1990-07-26 NO NO90903322A patent/NO903322L/no unknown
  • 1990-07-26 AU AU59839/90A patent/AU5983990A/en not_active Abandoned
  • 1990-07-26 MA MA22186A patent/MA21916A1/fr unknown
  • 1990-07-26 IL IL9519390A patent/IL95193A/xx not_active IP Right Cessation
  • 1990-07-27 FI FI903775A patent/FI903775A0/fi not_active IP Right Cessation
  • 1990-07-27 DD DD90343106A patent/DD296705A5/de not_active IP Right Cessation
  • 1990-07-27 RU SU904830729A patent/RU2052507C1/ru active
  • 1990-07-27 BR BR909003683A patent/BR9003683A/pt not_active Application Discontinuation
  • 1990-07-27 PT PT94841A patent/PT94841A/pt not_active Application Discontinuation
  • 1990-07-27 IE IE273590A patent/IE902735A1/en unknown
  • 1990-07-27 JP JP2198105A patent/JPH0717920B2/ja not_active Expired - Lifetime
  • 1990-07-27 RO RO145637A patent/RO109558B1/ro unknown
  • 1990-07-27 HU HU904672A patent/HUT56399A/hu unknown
  • 1990-07-28 KR KR1019900011763A patent/KR950000075B1/ko active IP Right Grant

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