Methods and compositions for cleaning and bleaching plastic...

Details Methods and compositions for cleaning and bleaching plastic... Methods and compositions for cleaning and bleaching plastic...

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B08B 3/10 (2006.01) A61L 12/12 (2006.01) C11D 3/39 (2006.01) C11D 11/00 (2006.01) G02C 7/04 (2006.01) G02C 13/00 (2006.01)

Patent

CA 1040812

UNITED STATES PATENT APPLICATION OF JOSEPH Z. KREZANOSKI FOR METHODS AND COMPOSITIONS FOR CLEANING AND BLEACHING PLASTIC ARTICLES Plastic articles are cleaned by successively immersing them in two aqueous solutions, with each solution containing an active oxygen yield- ing per compound and preferably a chelating agent. One of the solutions is formulated to be acidic and the other is formulated to be basic. After the article is removed from the last solution, it is treated with a non-ionic cleaner and then rinsed with water. The method produces a remarkable cleaning and bleaching action on dirty, discolored plastic compositions. This is particularly apparent when the method is applied to contact lenses.

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