Calcium carbonate scale inhibitor having organophosphonate, water soluble acrylic or maleic copolymer and citric acid
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United States of America Patent
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Nov 9, 1993
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N/A
app pub date -
Aug 26, 1991
filing date -
Sep 3, 1990
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Abstract
A scale inhibitor for a calcium-type scale, which includes ingredients of: (a) an organophosphonic acid or its salt having an scale inhibiting activity; (b) a water-soluble acrylic acid-type or maleic acid-type polymer constituted by at least two kinds of monomer unit composed of a vinyl monomer having a carboxyl group or another polar group; and (c) citric acid or its salt.
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