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US 5,098,447 AGranted
Process for bleaching and sterilizing cork articles, and cork articles bleached using the said process
AssigneeInterox Chimica S.p.A.
InventorsGiovanni Zucchini, Amerigo Donati
Life of this patent
Estimating the term…
Abstract
Cork articles are bleached by a treatment by means of an alkaline aqueous solution of hydrogen peroxide and by drying the articles, impregnated with hydrogen peroxide, in the presence of an ultraviolet radiation. No figure.
Claims11
A process for bleaching cork articles comprising:
- impregnating said cork article with an alkaline aqueous hydrogen peroxide solution to obtain impregnated cork articles containing more than 0.05 g H.sub.2 O.sub.2 /100 g of cork, said solution having a ph above about 8.5 and containing from about 10 to about 300 grams of hydrogen peroxide per liter;
- and drying said cork impregnated articles while subjecting said articles to the action of ultraviolet radiation generated by an artificial source for at least 2 hours at wavelengths from about 200 nm to about 350 nm.
A process for bleaching cork articles, consisting essentially of:
- impregnating said cork article with an alkaline aqueous hydrogen peroxide solution to obtain impregnated cork articles containing more than 0.05 g H.sub.2 O.sub.2 /100 g of cork, said solution having a ph above about 8.5 and containing from about 10 to about 300 grams of hydrogen peroxide per liter;
- and
- subjecting said articles impregnated with hydrogen peroxide to the action of ultraviolet radiation generated by an artificial source for about 2 to about 6 hours at wave lengths from about 200 nm to about 350 nm and drying bleached articles.
Dependencies are inferred from the claim text.