Abstract
The anti-coloration effects of the some kinds of suhstance for non-woven fabrics was investigated. Commercially available anti-oxidants used for anti-coloration of non-woven fabrics, ultra-violet absorbents and stearic acid metallic soaps, as well as stearic acid were selected. Coloration of the non-woven fabrics is due to the deterioration phenomenon of the polymer. It is presumed that coloration is caused by the carbonyl group formed in the decomposition of the hydroperoxide, which, in turn, was formed by the action of a trace amount of oxygen on the hydrocarbons in the binder resins radicalized by heat or light. Since the anti-oxidants and the ultra-violet absorbents themselves are transformed during the prevention of the coloration of resins, they require an induction period in the process of the oxidation. While, stearic acid and the metallic soap prevent the deterioration by blooming on the surface of resins and covering them, and they themselves are not transformed, they do not require the induction period. The metallic soap of zinc, tin, plumb and magnesium has the effects of the similar degree to that of stearic acid. The metallic soap of aluminium, manganess as well as cobalt have effects superior to that of stearic acid. The effect of calcium is inferior to that of stearic acid. The difference in the covering effects of various metals may have some relationships with the refractive index of the metallic soap.
