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Warewashing composition comprising a Zn/Al corrosion inhibitor for use in automatic dishwashing machines

  • US 7,829,516 B2
  • Filed: 11/12/2009
  • Issued: 11/09/2010
  • Est. Priority Date: 07/02/2003
  • Status: Expired due to Term
First Claim
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1. A warewashing detergent composition comprising:

  • (a) a cleaning agent comprising a detersive amount of a surfactant;

    (b) an alkaline source comprised of at least 17 weight percent carbonate or bicarbonate or hydroxide in an amount effective to provide a use composition having a pH of at least about 8 and obtained by diluting the warewashing detergent composition with water; and

    (c) a corrosion inhibitor in an amount sufficient for reducing corrosion of glass, the corrosion inhibitor comprising;

    (i) a source of aluminum ion;

    (ii) a source of zinc ion; and

    (iii) wherein the source of aluminum ion and the source of zinc ion are present in amounts sufficient to provide a use composition having a weight ratio of zinc ion to aluminum ion of at least about 2;

    1 up to about 15;

    1;

    (d) encapsulated chlorine bleaching agent; and

    (e) less than 10 weight percent water wherein the detergent is formed into a block.

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