Leather tanning process

Details Leather tanning process Leather tanning process

1997-07-30

1999-03-23

Diamond, Alan

Bleaching and dyeing; fluid treatment and chemical modification

Treatment of hides, skins, feathers and animal tissues

Tanning

8 9418, 8 9421, 8 9433, 8 9426, 8 9427, 8 9432, C14C 306, C14C 310, C14C 328

Patent

active

058853022

ABSTRACT:
The present invention refers to a new process meant for chrome and/or vegetable leather tanning. The process proposed by the invention comprises the steps of bating or purging, conditioning, and chrome and/or vegetable tannage. The conditioning step uses hydroxy-butaldehyde which reacts by blocking the amines of the collagen and releasing carboyxls. This reaction reduces the isoelectric point to 4.0-4.5, making the hide receptive or susceptible to effective chrome tannage by linking the carboxyls, or to tannin, by linking through hydrogen bridges. Hydroxy-butaldehyde is used in the conditioning step in a proportion of 2.5-3.0% as compared to the weight of the delimed hide, in a concentration of 40.+-.2%, with a pH of 4.2-4.4, and with the reaction time being from 3 to 4 hours.

REFERENCES:
patent: 1659520 (1928-02-01), Dodge
patent: 2880053 (1959-03-01), Fein et al.
patent: 3346324 (1967-10-01), Fein et al.
patent: 4978361 (1990-12-01), Fuchs et al.
T.C. Thorstensen, Practical Leather Technology, pp. 284 and 288 (month unknown), 1976.

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