Phosphate-Free Dishwashing Formulations with Graft Copolymers
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Solution Overview
Problem
Phosphate-free dishwashing detergents face challenges in deposit inhibition, particularly on glass surfaces, as existing polymers are not adequately effective in preventing calcium phosphate deposits and other inorganic and organic salt depositions during washing and drying.
Innovation Solution
Formulations comprising methylglycine diacetate (MGDA) or glutamic acid diacetate (GLDA) and a graft copolymer with a nonionic monosaccharide or polysaccharide base and ethylenically unsaturated mono- or dicarboxylic acid side chains, which provide enhanced deposit inhibition without phosphates or heavy metals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If phosphate-free detergents are used, then environmental safety is improved, but deposit inhibition effectiveness deteriorates
Solution Approach 1:
The invention uses composite polymer systems combining polycarboxylate polymers (such as polyacrylic acid, polymaleic acid, or their copolymers) with specific molecular weight ranges (10,000-500,000 g/mol) and controlled composition ratios to achieve effective deposit inhibition in phosphate-free formulations. The composite nature of these polymer blends provides both environmental compatibility and functional effectiveness.
2Ease of manufacture
If conventional polymers are used in phosphate-free detergents, then manufacturing simplicity is improved, but deposit inhibition on glass surfaces deteriorates
Solution Approach 1:
The invention specifies precise parameter ranges for polymer characteristics including molecular weight (10,000-500,000 g/mol), composition ratios of copolymer components, and concentration levels in the detergent formulation. These controlled parameter changes optimize the polymer's interaction with calcium phosphate crystals and glass surfaces, enhancing deposit inhibition while maintaining manufacturing feasibility through well-defined specification ranges.
Data Source
AI summary
A formulation including(A) at least one compound selected from methylglycine diacetate (MGDA) and glutamic acid diacetate (GLDA) and salts thereof,(B) at least one graft copolymer composed of(a) at least one graft base selected from nonionic monosaccharides, disaccharides, oligosaccharides and polysaccharides,and side chains obtainable by grafting on of(b) at least one ethylenically unsaturated mono- or dicarboxylic acid and(c) at least one compound of the general formula (I),where the variables are defined as follows:R1 is selected from methyl and hydrogen,A1 is selected from C2-C4-alkylene,R2 are identical or different and selected from C1-C4-alkyl,X− is selected from halide, mono-C1-C4-alkyl sulfate and sulfate.