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Hair Dye Patented by Kao



Published November 14, 2005
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Patent No. US 6,533,823 B2: Kao Corp., Tokyo, patented a hair dye composition comprising a hydrolyzate of a lower alkyl vinyl ether/maleic anhydride copolymer partially crosslinked with a terminally unsaturated diene compound, or a monoalkyl ester of the hydrolyzate; acidic dye and solvent.


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