公开(公告)号：BR0315817A

公开(公告)日：2005-09-13

申请号：BR0315817

申请日：2003-11-25

Applicant: BASF AG

Inventor： HUEFFER STEPHAN ,  SCHROEDER STEFAN ,  CARLE JUERGEN ,  RODLER THORSTEN ,  BACH VOLKER ,  TAEGER TILMAN LUEDECKE

IPC: C14C3/16 ,  C14C3/28

Abstract: A semifinished leather product is produced from an animal hide by pretanning with the use of a chromium-free tanning agent and of a clay mineral which, after stirring for 30 minutes in water at 50° C. at a circumferential rotor speed of from 5 to 25 m/s, has a number average particle diameter of less than 2 μm or a bimodal particle size distribution with a first, finely divided fraction whose number average particle diameter is less than 0.5 μm and a second, coarser fraction whose number average particle diameter is less than 5 μm, determined in each case by the method according to ISO 13320-1, by combined laser light diffraction and light scattering, a proportion of the first, finely divided fraction being from 10 to 90% by weight, and drying of the pretanned animal hide to a water content of from 5 to 45%, based on the total weight of the semifinished leather product.

公开(公告)号：DE4440846A1

公开(公告)日：1996-05-23

申请号：DE4440846

申请日：1994-11-15

Applicant: BASF AG

Inventor： BRETH MANFRED ,  CARLE JUERGEN ,  BIRKHOFER HERMANN DR ,  KNEIP MICHAEL DR

IPC: C14C3/16 ,  C14C3/22 ,  C14C3/28 ,  C14C9/02

Abstract: The invention concerns the preparation of leather and furs by tanning without the use of plant, synthetic and mineral tanning agents and only with polymer tanning agents. Aldehydes or reactive carbonyl compounds can optionally be used in the pre-tanning stage.

公开(公告)号：DE10255095A1

公开(公告)日：2004-06-03

申请号：DE10255095

申请日：2002-11-26

Applicant: BASF AG

Inventor： HUEFFER STEPHAN ,  SCHROEDER STEFAN ,  CARLE JUERGEN ,  RAEDLER THORSTEN ,  BACH VOLKER ,  TAEGER TILMAN LUEDECKE

IPC: C14C3/16 ,  C14C3/28 ,  C14B3/00

Abstract: A semifinished leather product is produced from an animal hide by pretanning with the use of a chromium-free tanning agent and of a clay mineral which, after stirring for 30 minutes in water at 50° C. at a circumferential rotor speed of from 5 to 25 m/s, has a number average particle diameter of less than 2 μm or a bimodal particle size distribution with a first, finely divided fraction whose number average particle diameter is less than 0.5 μm and a second, coarser fraction whose number average particle diameter is less than 5 μm, determined in each case by the method according to ISO 13320-1, by combined laser light diffraction and light scattering, a proportion of the first, finely divided fraction being from 10 to 90% by weight, and drying of the pretanned animal hide to a water content of from 5 to 45%, based on the total weight of the semifinished leather product.

公开(公告)号：DE4430290A1

公开(公告)日：1996-02-29

申请号：DE4430290

申请日：1994-08-26

Applicant: BASF AG

Inventor： BIRKHOFER HERMANN DR ,  BRETH MANFRED ,  MOSER ERWIN ,  WOLF GERHARD DR ,  CARLE JUERGEN

IPC: C14C3/04 ,  C14C3/16 ,  C14C3/08

Abstract: Prodn. of leather and hides involves: (a) pretanning with an aldehyde tanning agent (I); and (b) retanning with a mineral tanning agent, with omission of the defatting, pickling, deliming and neutralisation steps. The novelty is that (I) comprises 2-8C aliphatic, 8-14C aromatic or 9-16C araliphatic dialdehyde, 2-8C aliphatic monobasic aldehydocarboxylic acid, 3-10C aliphatic mono- or di-basic keto-carboxylic acid, their acetals with 1-10C aliphatic mono- or dihydric alcohols, opt. reacted with 1-50 mole ethylene oxide and/or propylene oxide/OH gp., or mixts. of these cpds. (I) esp. is 2-4C aliphatic dialdehyde(s) and/or their acetal(s).