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:
Mar. 09, 1982
Filed:
Sep. 06, 1979
Chemische Fabrik, Cologne, DE;
Abstract
The invention relates to a process for improving the lightfastness of conventionally dyed leathers by treating the leathers before, during or after fatting with alkane and/or chloroalkane sulfonamides in amounts of about 0.1 to 8 weight percent, based on the shaved weight of the leather. Used as alkane sulfonamides and chloroalkane sulfonamides are preferably products with a chain length of about 10 to 35 carbon atoms and a chlorine content of about 10 to 40%. The alkane and/or chloroalkane sulfonamides are advantageously used in aqueous solution or in stable emulsion. A substantial improvement in lightfastness is obtained regardless of the type of the dye, tanning agent, fatting agent or other leather treating agent used.