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:
Nov. 21, 1978
Filed:
May. 31, 1977
Harro Traubel, Leverkusen, DE;
Helga Heinze, Cologne, DE;
Bayer Aktiengesellschaft, Leverkusen, DE;
Abstract
In the tanning or re-tanning of a hide with a tanning composition comprising a tanning-active substance and at least one of a Cr(III) salt, a dicarboxylic acid, a dicarboxylic acid salt, an emulsifier and an acid-binding agent, the improvement which comprises employing as said tanning-active substance a carboxylic acid carrying at least one of an ester, urethane or amide group. Advantageously the agent has at least two carboxyl groups per molecule and a molecular weight of about 170 to 30,000, preferably 310 to 10,000. The products are softer and better through-tanned and there is maximum utilization of chromium, thereby minimizing the waste disposal problem.