PROCESS FOR PRODUCING CHROME-FREE SOFT LEATHER

PROCESS FOR PRODUCING CHROME-FREE SOFT LEATHER

In prodn. of chrome-free soft leather by tanning the skins with known vegetable and/or synthetic tanning agents, the limed, lime-free and bated skins are treated before tanning with 2-20 wt.%, w.r.t. the leather, of mineral oil(s), fat(s) or fatty oil(s) and/or mineral oil derivs. reactive with the...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: VERMES,LASZLO,HU, KARNITSCHER,TAMAS,HU, BACH,ISTVANNE,HU
Format: Patent
Sprache:eng
Schlagworte:
APPARATUS THEREFOR
CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING,IMPREGNATING, FINISHING
CHEMISTRY
COMPOSITIONS FOR TANNING
HIDES
LEATHER
METALLURGY
PELTS
SKINS
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Beschreibung
Zusammenfassung:In prodn. of chrome-free soft leather by tanning the skins with known vegetable and/or synthetic tanning agents, the limed, lime-free and bated skins are treated before tanning with 2-20 wt.%, w.r.t. the leather, of mineral oil(s), fat(s) or fatty oil(s) and/or mineral oil derivs. reactive with the NH2 gps. of the leather proeteins, at a temp. at which these agents are liq., but at least 20 deg.C below the shrinkage temp. of the leather. Treatmeht is for 0.5-7 h, depending on the thickness of the leather. ADVANTAGE - Environmentally harmful chrome wastes are avoided. Rapid bonding of the tanning agent, causing over-tanning of the leather surface, is prevented.