Treatment and after-treatment of metal with carbohydrate-modified polyphenol compounds
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United States of America Patent
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Oct 16, 1990
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N/A
app pub date -
Dec 4, 1987
filing date -
Dec 4, 1987
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Expired
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Abstract
A metal treatment solution comprising an effective amount of a soluble or dispersible compound which is a derivative of a polyphenol. Novel derivatives of polyphenol compounds useful in the treatment of the surface of metal articles is provided. Novel surface treatment solutions or dispersions, and methods for using these solutions is provided. Carbohydrate-modified polyphenol compounds are utilized in the present invention. The molecular weight of the polyphenols used in the preparation of derivatives of the present invention are in the range of about 360 to about 30,000 or greater. The resulting derivatives will typically have a molecular weight of up to about 2,000,000 with molecular weights within the range of about 700 to about 70,000 being preferred.
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