Automatic Dishwashing Composition with Biodegradable Dispersant Polymers
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Solution Overview
Problem
There is a need for new dispersant polymers in automatic dishwashing formulations that provide effective spotting/filming shine performance and are both biosourced and biodegradable, particularly in phosphate-free compositions.
Innovation Solution
A dishwashing composition comprising a builder, a nonionic surfactant, and a dispersant polymer selected from non-sulfonated hydrophobic modified, sulfonated, or acrylic acid homopolymers, or a mixture thereof, including specific structural units, which when combined with poly(glutamic acid), enhances antispotting/antifilming performance while improving sustainability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phosphate-free automatic dishwashing compositions use non-phosphate builders (such as citrate, carbonate, silicate salts), then environmental sustainability is improved, but insoluble visible deposits appear on washed articles
Solution Approach 1:
The patent introduces poly(glutamic acid) and dispersant polymers as intermediary substances that mediate between the non-phosphate builders and the washed articles. These polymers bind to metal ions (Ca2+, Mg2+) and disperse them in solution, preventing direct deposition on articles while maintaining the phosphate-free environmentally sustainable formulation.
Solution Approach 2:
The patent changes the chemical parameters of the water treatment system by using specific polymer compositions (poly(glutamic acid) with dispersant polymers containing carboxylic acid groups) that alter how metal ions behave in solution, transforming them from deposit-forming species to dispersed complexes that remain soluble and do not create visible deposits on articles.
2Object-affected harmful factors
If conventional dispersant polymers are used to prevent spotting and filming, then antispotting/antifilming performance is achieved, but biosustainability is reduced
Solution Approach 1:
The patent changes the chemical structure parameters of dispersant polymers by selecting biodegradable and biosourced options (such as polymers derived from renewable resources with specific molecular weights and functional group compositions) that maintain effective metal ion binding and dispersion capabilities while being environmentally sustainable and biodegradable.
Solution Approach 2:
The patent creates a composite polymer system combining poly(glutamic acid) with specific dispersant polymers (containing carboxylic acid groups and specific structural units) to achieve synergistic effects where the combination provides superior antispotting and antifilming performance while maintaining biosustainability, leveraging the complementary properties of each polymer component.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition achieves antispotting/antifilming performance comparable to conventional formulations while significantly enhancing sustainability by using biodegradable and biosourced polymers.
Implementation Method 1
a dispersant polymer selected from the group consisting of: (a) a non-sulfonated hydrophobic modified polymer, comprising (i) 60 to 98 wt%, based on weight of the non-sulfonated hydrophobic modified polymer, of structural units of formula I
Implementation Method 2
a poly(glutamic acid)
Implementation Method 3
a nonionic surfactant
Data Source
AI summary
An automatic dishwashing composition is provided including a builder; a nonionic surfactant; a poly(glutamic acid); and a dispersant polymer selected from the group consisting of: (a) a non-sulfonated hydrophobic modified polymer, comprising (i) 60 to 98 wt%, based on weight of the non-sulfonated hydrophobic modified polymer, of structural units of formula I, wherein each R1 is independently selected from a hydrogen and a -CH3 group; and (ii) 2 to 40 wt%, based on weight of the non-sulfonated hydrophobic modified polymer, of structural units of formula II, wherein each R2 is independently selected from a -C1-4 alkyl group and wherein each R3 is independently selected from a hydrogen and a methyl group; (b) a sulfonated polymer; (c) an acrylic acid homopolymer; and (d) a mixtures thereof.