Zero phosphate warewashing detergent composition
AssigneeEcolab Inc.
InventorsSteven E. Lentsch, Thomas R. Oakes
Life of this patent
Estimating the term…
Abstract
A warewashing detergent composition with an improved builder system having zero phosphate that conditions service water by holding or suspending divalent or trivalent hardness ions in solution and by preventing precipitation of the hardness ions beyond their stoichiometric concentration. The composition comprises a source of alkalinity, a water-conditioning vinyl polymer with pendant --CO.sub.2 H groups, a soil-dispersing phosphinopolycarboxylic acid, and a water-conditioning organic phosphonate.
Claims42
A builder system for machine warewashing that conditions service water by holding or suspending divalent or trivalent hardness ions in solution and by preventing precipitation of the hardness ions beyond their stoichiometric concentration, comprising:
- (a) an effective amount of a polymer water-conditioning agent comprising a vinyl polymer with pendant --CO.sub.2 H groups having a molecular weight of 500-15,000;
- (b) an effective amount of a polymer soil-dispersing agent comprising a phosphinopolycarboxylic acid;
- and
- (c) an effective amount of a monomer threshold agent comprising a water-conditioning organic phosphonate.
A builder system for machine warewashing that conditions service water by holding or suspending divalent or trivalent hardness ions in solution and by preventing precipitation of the hardness ions beyond their stoichiometric concentration, comprising:
- (a) about 2-9% of an acrylic polymer comprising polyacrylic acid, the partial sodium salt of polyacrylic acid or sodium polyacrylate having a molecular weight of about 1,000-6,000;
- (b) about 0.7-3% of a phosphinopolycarboxylic acid having a molecular weight of about 250-3,000;
- and
- (c) about 0.9-4% of an organic phosphonate comprising 1-hydroxyethylidene-1,1-diphosphonic acid.
A warewashing detergent composition that conditions service water by holding or suspending divalent or trivalent hardness ions in solution and by preventing precipitation of the hardness ions beyond their stoichiometric concentration, comprising:
- (a) about 5-75% of a source-of alkalinity;
- (b) about 1-40% of a water-conditioning agent comprising a vinyl polymer with pendant-CO.sub.2 H groups,
- having a molecular weight of about 500-15,000;
- (c) about 0.3-14% of a polymer soil-dispersing agent comprising a phosphinopolycarboxylic acid having a molecular weight of about 200-5,000;
- and
- (d) about 0.5-18% of a monomer threshold agent comprising a water-conditioning organic phosphonate.
A warewashing detergent composition having a zero phosphate content that conditions service water by holding or suspending divalent or trivalent hardness ions in solution and by preventing precipitation of the hardness ions beyond their stoichiometric concentration, comprising:
- (a) about 20-60% of an alkali metal hydroxide comprising sodium hydroxide, potassium hydroxide, or mixtures thereof;
- (b) about 2-9% of an acrylic polymer comprising polyacrylic acid, the partial sodium salt of polyacrylic acid or sodium polyacrylate having a molecular weight of about 1,000-6,000;
- (c) about 0.7-3% of a phosphinopolycarboxylic acid having a molecular weight of about 250-3000;
- and
- (d) about 0.9-4% of an organic phosphonate comprising 1-hydroxyethylidene-1,1-diphosphonic acid.
A warewashing process for cleaning a soiled surface using a detergent composition that conditions service water by holding or suspending divalent or trivalent hardness ions in solution and by preventing precipitation of the hardness ions beyond their stoichiometric concentration, comprising:
- (a) dissolving in water an effective amount of said detergent composition, thereby forming an aqueous wash solution, said detergent composition comprising:
- (1) about 5-75% of a source of alkalinity;
- (2) about 1-40% of a water-conditioning vinyl polymer with pendant --CO.sub.2 H groups having a molecular weight of about 500-15,000;
- (3) about 0.3-14% of a phosphinopolycarboxylic soil dispersing agent and having a molecular weight of about 200-5,000;
- and
- (4) about 0.5-18% of a water-conditioning organic phosphonate monomer;
- and
- (b) contacting said aqueous wash solution of (a) with said soiled surface for a period of time effective to clean said soiled surface.
Dependencies are inferred from the claim text.