Tanning of hides

Details Tanning of hides Tanning of hides

C - Chemistry, Metallurgy

14

C

8/63

C14C 3/08 (2006.01) C14C 3/06 (2006.01) C14C 9/00 (2006.01)

Patent

CA 1052954

ABSTRACT OF THE DISCLOSURE This invention relates to an improved process for the chrome- tanning of hides to produce leather which comprises the steps of (a) pickling the hide (b) pretanning the hide with a chromium (III) salt, and (c) full tanning the hide with a tanning mixture containing a chromium (III) salt, an acid-binding agent and a polycarboxylic acid or salt thereof, in which the improvement comprises in step (c) at least 1.6 moles per mole of Cr2O3 in the chromium (III) salt employed of an aliphatic dicarboxylic acid of 4 to 6 carbon atoms or an aromatic dicarboxylic or tricarboxylic acid containing 8 to 13 carbon atoms or a salt thereof, and wherein the total quantity of Cr2O3 employed in steps (b) and (c) ranges from 1.2 to 2% by weight of the dehaired hide, and step (c) is carried out with up to 100% of the tanning liquor based on the weight of the hide so that the final pH of the liquor is at least 3.6. Advantageously, a powder composition comprising additional chromium (III) salt, polycarboxylic acid or salt and acid-binding agent, preferably dolomite, is added after step (b). The invention also relates to a tanning composition useful in this process.

227183

Affiliated with

Also associated with

Rating

Tanning of hides does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Tanning of hides, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tanning of hides will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-757726