Bleaching and dyeing; fluid treatment and chemical modification – Treatment of hides – skins – feathers and animal tissues – Tanning
Patent
1986-06-24
1988-11-15
Lieberman, Paul
Bleaching and dyeing; fluid treatment and chemical modification
Treatment of hides, skins, feathers and animal tissues
Tanning
8 9432, 8 9419R, C14C 308, C14C 310
Patent
active
047846640
ABSTRACT:
The present process yields superior leather materials from limed hides, without the use of chromium salts, by combining a series of essential method steps in a sequence which yields leather having a "chrome" character. The present chromium-free tanning process includes the method steps of pretanning a hide with a chromium-free tan until its shrinkage temperature is about 170.degree. to 185.degree. F., submerging the hide in an acidic brine, having a pH between 2.5 and 3.5, and adding (in sequence, and in amounts sufficient to yield specified concentrations of each) pretanning agents, syntans, vegetable extracts, neutralizing agents and retanning and finishing agents, all of which are free from chromium. This method of pretanning, tanning and retanning a hide with a specified sequence of particular concentrations of chromium-free reagents yields a leather product having the characteristics of chrome-tanned leather and which demonstrates superior shrink resistance, resilience and flexural strength. The resultant leather product has particular utility when incorporated into durable, weather-resistant footwear such as military shoes and boots, but is likewise suitable for use in other applications which require durable, attractive leather goods such as handbags and attaches.
REFERENCES:
patent: 2840445 (1958-06-01), Severn
patent: 2955013 (1960-10-01), Meister et al.
patent: 3345203 (1967-10-01), Kine et al.
patent: 4285689 (1981-08-01), Siegler
Diamont Ernest
Quinn Colin D.
Siegler Marcel
Suarez Joseph L.
Lieberman Paul
McNally John F.
Seton Company
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