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1. (WO2015044765) TANNING PROCESS FOR OBTAINING LEATHER
Latest bibliographic data on file with the International Bureau   

Pub. No.: WO/2015/044765 International Application No.: PCT/IB2014/001956
Publication Date: 02.04.2015 International Filing Date: 30.09.2014
IPC:
C14C 1/08 (2006.01) ,C14C 3/06 (2006.01)
C CHEMISTRY; METALLURGY
14
SKINS; HIDES; PELTS; LEATHER
C
TREATING SKINS, HIDES OR LEATHER WITH CHEMICALS, ENZYMES OR MICRO-ORGANISMS, e.g. TANNING, IMPREGNATING OR FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
1
Treating skins or hides with chemicals, enzymes or micro-organisms prior to tanning
08
Deliming; Bating; Pickling; Degreasing
C CHEMISTRY; METALLURGY
14
SKINS; HIDES; PELTS; LEATHER
C
TREATING SKINS, HIDES OR LEATHER WITH CHEMICALS, ENZYMES OR MICRO-ORGANISMS, e.g. TANNING, IMPREGNATING OR FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
3
Tanning; Compositions for tanning
02
Chemical tanning
04
Mineral tanning
06
using chromium compounds
Applicants:
RHODIA POLIAMIDA E ESPECIALIDADES LTDA [BR/BR]; Av. Maria Coelho Aguiar, 215 - Bloco B - 1° andar Parte 1 - Jardim Sao Luiz CEP 05804-902 Sao Paulo - SP, BR
Inventors:
LOURENÇO, Wagner Célio Ferraz; BR
Priority Data:
EP13186726.930.09.2013EP
Title (EN) TANNING PROCESS FOR OBTAINING LEATHER
(FR) PROCÉDÉ DE TANNAGE POUR OBTENIR UN CUIR
Abstract:
(EN) The invention concerns a process for tanning hide to obtain leather. The general process for obtaining the intermediary wet blue stage comprises the following steps: a) a picking step with acid and salt, followed by b) a tanning step with chromium salt, followed by c) a basification step. The invention is characterized in that the bath of the pickling step comprises organic acids selected from 2-Methyl glutaric acid (MGA), ethyl succinic acid (ESA) and mixture thereof instead of the traditional strong acid, generally sulfuric acid This process requires less basification agent and enables an increase of the up-taking of the re- tanning products. This invention provides leather with improved mechanical properties.
(FR) La présente invention concerne un procédé de tannage d'une peau afin d'obtenir un cuir. Le procédé général pour obtenir l'étape intermédiaire de procédé en bleu humide (wet-blue) comprend les étapes suivantes : a) une étape de décapage à l'acide et au sel, suivie b) d'une étape de tannage au sel de chrome, suivie c) d'une étape de basification. L'invention est caractérisée en ce que le bain de l'étape de décapage comprend des acides organiques choisis parmi l'acide 2-méthylglutarique (MGA), l'acide éthylsuccinique (ESA) et un mélange de ceux-ci à la place de l'acide fort traditionnel, généralement l'acide sulfurique. Ce procédé requiert moins d'agent de basification et permet d'améliorer l'absorption des produits de retannage. La présente invention concerne un cuir doté de propriétés mécaniques améliorées.
Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JP, KE, KG, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Office (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (EPO) (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)