Bleaching and dyeing; fluid treatment and chemical modification – Treatment of hides – skins – feathers and animal tissues – Tanning
Patent
1989-04-25
1990-12-18
Lieberman, Paul
Bleaching and dyeing; fluid treatment and chemical modification
Treatment of hides, skins, feathers and animal tissues
Tanning
8 9418, 8 9419R, C14C 302, C14C 304
Patent
active
049783610
ABSTRACT:
Process for economy chrome tanning, which comprises pretreating the pelt prior to tanning with 0.5 to 2% by weight, preferably 0.7 to 1,2% by weight, of an aldehyde- or keto-carboxylic acid, tanning in a conventional manner and then finish-tanning with 2 to 4.5% by weight of a mixture of a chromium(III) salt, an acid-binding agent and an aromatic di- or tricarboxylic acid or a salt thereof.
REFERENCES:
patent: 4042321 (1977-08-01), Backer et al.
patent: 4715861 (1987-12-01), Lotz et al.
Fuchs Karlheinz
Munch Norbert
Hoechst Aktiengesellschaft
Lieberman Paul
McNally John F.
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