Abstract: A process for the tanning of skins applicable to lamb, goat, calf hides, or skins from other origins. The process is based in the previous modification of the collagen of the skin by covalent reaction with polyfunctional polymers with a high quantity of hydroxylic groups. The modification treatment may be carried out after bated skin or pickled skin has been previously depickled. After binding of the polymer, the reactivity of the skin substrate is modified whereby it will show a higher affinity for titanium salts, for example ammonium titanyl double sulphate, titanyl sulphate or any other soluble titanium compound.

Abstract: A process for the preparation of 2,6,10,15,19,23-hexamethyl tetracosane and the isomers thereof having a basic hexamethyl tetracosane structure is described. Therein the raw materials are vegetable triglyceride oils and fats or oleins thereof obtained by physical refining. Together with an optional prior refining step, the process comprises a fatty acid and unsaponifiable material separation step, a saponification step giving unsaturated hydrocarbons, a hydrogenation step and a final deparaffining and purification step.