The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 13, 2010
Filed:
Nov. 25, 2003
Stephan Hueffer, Ludwigshafen, DE;
Stefan Schroeder, Neuleiningen, DE;
Juergen Carle, Ludwigshafen, DE;
Thorsten Raedler, Ludwigshafen, DE;
Volker Bach, Neustadt, DE;
Tilman Luedecke Taeger, Seeheim-Jugenheim, DE;
Stephan Hueffer, Ludwigshafen, DE;
Stefan Schroeder, Neuleiningen, DE;
Juergen Carle, Ludwigshafen, DE;
Thorsten Raedler, Ludwigshafen, DE;
Volker Bach, Neustadt, DE;
Tilman Luedecke Taeger, Seeheim-Jugenheim, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
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.