Use of modified polyaspartic acids in dishwashing detergents

{
  "publication_number": "US9796951B2",
  "country": "US",
  "kind": "B2",
  "title": "Use of modified polyaspartic acids in dishwashing detergents",
  "abstract": "The present invention relates to the use of modified polyaspartic acids in dishwashing detergents, in particular as dispersants, film inhibitors and spot inhibitors. The invention also relates to dishwashing detergent compositions comprising modified polyaspartic acids.",
  "claims": [
    "1. An additive in dishwashing detergents which comprises a modified polyaspartic acid is preparable by polycondensation of (i) 50 to 99 mol % of aspartic acid and methanesulfonic acid in a ratio of 200:1 to 5:1; and (ii) 1 to 50 mol % of at least one carboxyl-containing compound, and subsequent hydrolysis of the cocondensates with the addition of a base, where (ii) is not aspartic acid.",
    "2. The additive according to claim 1, where (i) is 50 to 95 mol % of aspartic acid and (ii) is 5 to 50 mol % of at least one carboxyl-containing compound.",
    "3. The additive according to claim 1, where (i) is 80 to 95 mol % of aspartic acid and (ii) is 5 to 20 mol % of at least one carboxyl-containing compound.",
    "4. The additive according to claim 1, where (ii) is a monocarboxylic acid, a polycarboxylic acid, a hydroxycarboxylic acid and/or an amino acid.",
    "5. The additive according to claim 1, where (ii) is selected from the group consisting of 1,2,3,4-butanetetracarboxylic acid, citric acid, glycine and glutamic acid.",
    "6. The additive according to claim 1, where the base is alkali metal base, alkaline earth metal bases; carbonates; ammonia; primary, secondary or tertiary amines; or bases with primary, secondary or tertiary amino groups.",
    "7. The additive according to claim 1 in dishwashing detergents for machine dishwashers.",
    "8. The additive according to claim 1, where the modified polyaspartic acid is preparable by polycondensation of (i) 60 to 95 mol % of aspartic acid and methanesulfonic acid in a ratio of 100:1 to 10:1, and (ii) 5 to 40 mol % of at least one carboxyl-containing compound, and subsequent hydrolysis of the cocondensates with the addition of a base, where (ii) is not an aspartic acid.",
    "9. The additive according to claim 1, where the modified polyaspartic acid is preparable by polycondensation of (i) 80 to 95 mol %, of aspartic acid and methanesulfonic acid in a ratio of 50:1 to 12:1; and (ii) 5 to 20 mol %, of at least one carboxyl-containing compound, and subsequent hydrolysis of the cocondensates with the addition of a base, where (ii) is not an aspartic acid.",
    "10. A dishwashing detergent composition comprising (a) 1-20% by weight of at least one modified polyaspartic acid preparable by polycondensation of (i) 50 to 99 mol % of aspartic acid and methanesulfonic acid in a ratio of 200:1 to 5:1; and (ii) 1 to 50 mol % of at least one carboxyl-containing compound, and subsequent hydrolysis of the cocondensates with the addition of a base, where (ii) is not aspartic acid; (b) 0-50% by weight of complexing agent; (c) 0.1-80% by weight of builders and/or cobuilders; (d) 0.1-20% by weight of nonionic surfactants; (e) 0-30% by weight of bleaches and bleach activators; (f) 0-8% by weight of enzymes; and (g) 0-50% by weight of additives.",
    "11. The dishwashing detergent composition according to claim 10, where the composition is suitable for machine dishwashers.",
    "12. The dishwashing detergent composition according to claim 10, comprising (a) 2-12% by weight of at least one modified polyaspartic acid; (b) 3-50% by weight of methylglycinediacetic acid and salts thereof; (c) 15-65% by weight of builders and/or cobuilders (d) 0.5-10% by weight of nonionic surfactants (e) 0-30% by weight of bleaches and bleach activators (f) 0-8% by weight of enzymes; and 0-50% by weight of additives.",
    "13. The additive according to claim 1, where the modified polyaspartic acid is preparable by polycondensation of (i) 80 to 95 mol %, of aspartic acid and methanesulfonic acid in a ratio of 200:1 to 5:1; and (ii) 5 to 20 mol %, of at least one carboxyl-containing compound, and subsequent hydrolysis of the cocondensates with the addition of a base, where (ii) is not an aspartic acid."
  ],
  "description_excerpt": "The present invention relates to the use of modified polyaspartic acids in dishwashing detergents, in particular as dispersants, film inhibitors and spot inhibitors.\n\nPolymers of carboxyl-group-containing monomers and obtainable by radical polymerization have been an important constituent of phosphate-containing and phosphate-free machine dishwashing detergents for many years. As a result of their soil-dispersing and film-inhibiting effect, they make a considerable contribution to the cleaning and clear rinse performance of the machine dishwashing detergents. For example, they ensure that no salt deposits of the hardness-forming calcium and magnesium ions are left behind on the ware. Homopolymers and copolymers of acrylic acid are often used for this purpose.\n\nA disadvantage of these polymers of carboxyl-group-containing monomers obtainable by radical polymerization is that they are not biodegradable under aerobic conditions, as prevail e.g. in a communal sewage works.\n\nOn account of increasing environmental awareness, the demand for biodegradable polymeric alternatives to the polycarboxylates based on acrylic acid is therefore growing. However, commercially available biodegradable polymers such as, for example, polyaspartic acid or carboxymethylated inulin have only gained acceptance in commercial terms with difficulty. The reasons are manifold: inadequate effect in the specific application, excessively high costs on account of complex production processes and/or expensive feed materials, no or little flexibility of the polymer synthesis.",
  "cpc": [
    "C11D 3/3719",
    "C11D 1/66",
    "C11D 3/33",
    "C11D 3/37"
  ],
  "ipc": [
    "C11D 3/33",
    "C11D 3/37",
    "C11D 1/66"
  ],
  "assignees": [
    "BASF SE"
  ],
  "inventors": [
    "Jürgen Detering",
    "Gazi TÜRKOGLU",
    "Dietrich Fehringer",
    "Heike Weber"
  ],
  "filing_date": "2014-09-05",
  "publication_date": "2017-10-24",
  "grant_date": "2017-10-24",
  "priority_date": "2013-09-16",
  "application_number": "US-201415022017-A",
  "family_id": "49162081",
  "cited_by_count": 19,
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}