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US 5,508,195 AGranted
Method for liming hides and skins
AssigneeRohm Co., Ltd.
InventorsJuergen Christner, Tilman Taeger, Gertrud Wick
Life of this patent
Estimating the term…
Abstract
A method for liming hides and skins using a proteolytic enzyme in an aqueous-alkaline float is taught, wherein the liming float has a pH value from 10-14 and contains both thiourea dioxide and an alkaline protease having elastase activity.
Claims5
A method for liming hides and skins which comprises treating said hides and skins in an aqueous alkaline float suitable for liming and having a pH value from 10-14 until hair has been removed from them, said float comprising A) thiourea dioxide in an amount from 0.3-2 percent by weight of the hides and skins treated;
- B) alkaline protease activity, LVU, in a range equivalent to that of a protease having an activity of 4000 LVU present in an amount which is 0.05-0.8 percent by weight of the hides and skins treated;
- and
- C) alkaline elastase activity, E.U.gly, the value of which is related to the activity of the protease by the relationship ##EQU2## where F has a value from 0.6-20.
Dependencies are inferred from the claim text.