Patents Assigned to Muenzing Chemie GmbH
  • Re-tanning process
    Patent number: 5464451
    Abstract: A process for the re-tanning of tanned leather or pelt, wherein the tanned leather pelt is re-tanned with(A) a polymeric carboxylic acid, containing .alpha.-hydroxyacrylic units as constituent units of the polymer, optionally in salt formwith the proviso that for this re-tanning (A) is not employed immediately after a mineral tanning, immediately before a mineral re-tanning or after a mineral re-tanning and also not in a direct connection with a mineral after-treatment.
    Type: Grant
    Filed: February 17, 1994
    Date of Patent: November 7, 1995
    Assignees: Sandoz Ltd., Muenzing Chemie GmbH
    Inventors: Jacques P. Denny, Josep R. Sorolla