Anionic Polyester Particles for Stable Suspension in Liquid Detergents
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Solution Overview
Problem
Liquid detergents and cleaning agents with suspended particles face issues of particle size affecting aesthetics and functionality, where high active ingredient content can lead to visible residues on treated surfaces, and existing solutions fail to maintain stable suspension and prevent clumping or deposition.
Innovation Solution
Incorporating anionic polyesters with specific structural units and particle sizes, which are synthesized through polycondensation of dialkyl terephthalate, dialkyl 5-sulfoisophthalate, and alkylene glycols, to create stable, non-dissolving particles that maintain suspension and prevent residue formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If solid particles with high active ingredient content are incorporated to improve cleaning performance, then cleaning effectiveness is improved, but visible residues and stains occur on treated surfaces
Solution Approach 1:
The patent changes the physical-chemical parameters of the solid particles by using anionic polyester as the base material with specific structural units (I), (II), and (III). This material composition change allows the particles to maintain stability in liquid detergent while ensuring complete dissolution or disintegration during washing, eliminating visible residues. The particle size is also optimized to 0.01 mm to 3 mm to balance aesthetic appearance with dissolution performance.
Solution Approach 2:
The patent employs composite material structure where anionic polyester serves as the base material containing specific structural units (I), (II), and (III). This composite structure enables the particles to simultaneously achieve stable suspension in the liquid phase and complete dissolution during washing, resolving the contradiction between maintaining suspension stability and preventing residue formation.
2Object-generated harmful factors
If particle size is reduced to improve dissolution and prevent residues, then residue formation is reduced, but aesthetic appeal and visibility as individualized particles is compromised
Solution Approach 1:
The patent optimizes the particle size parameter to a specific range of 0.01 mm to 3 mm. This parameter optimization ensures that particles are small enough to dissolve completely during washing (preventing residues) while remaining large enough to be visible as individualized speckles in the liquid detergent, maintaining aesthetic appeal.
3Shape
If solid particles are suspended to maintain aesthetic appeal in transparent liquid phase, then aesthetic appeal is improved, but stable suspension and prevention of clumping is difficult to achieve
Solution Approach 1:
The patent uses anionic polyester with specific structural units (I), (II), and (III) as the base material for solid particles. This composite material composition provides both aesthetic appeal when suspended in transparent liquid phase and inherent stability that prevents clumping and sedimentation, resolving the contradiction between aesthetics and suspension stability.
Solution Approach 2:
The patent optimizes particle size parameters to 0.01 mm to 3 mm, which balances aesthetic visibility with suspension stability. The specific material composition and size parameters work together to maintain stable suspension without clumping while preserving aesthetic appearance.
4Productivity
If high concentration of active ingredients is used to improve cleaning performance, then cleaning effectiveness is improved, but uneven dosage and local overconcentrations occur
Solution Approach 1:
The patent segments the active ingredients into individualized solid particles with specific size (0.01 mm to 3 mm) and composition (anionic polyester with structural units I, II, and III). This segmentation ensures uniform distribution throughout the liquid detergent and prevents local overconcentrations, while each particle maintains high active ingredient content for effective cleaning performance.
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 anionic polyester-based particles ensure stable suspension in liquid detergents, preventing clumping and residue formation on surfaces, while maintaining aesthetic appeal and effective cleaning performance.
Implementation Method 1
solid particles suspended in the liquid phase with an average particle diameter X 50.3, volume average, of 0.01 mm to 3 mm... ensuring stable suspension in liquid detergents, preventing clumping
Implementation Method 2
synthesized through polycondensation of dialkyl terephthalate, dialkyl 5-sulfoisophthalate, and alkylene glycols
Data Source
AI summary
The invention relates to particulate solids with an average particle diameter X50,3 of 0.01 mm to 3 mm, containing a total quantity of 30 to 100 wt.%, preferably 50 to 100 wt.%, particularly preferably 75 to 100 wt.%, based on the total weight, of at least one polyester, containing at least one structural unit of the formula (I) and at least one structural unit of the formula (II), in which a and c each represents a number from 1 to 200 independently of each other, R1, R2, R5, and R6 each represents hydrogen or a C1-C18 n-alkyl group or a C3-C18 iso-alkyl group independently of one another, R7 represents a linear or branched C1-C30 alkyl group or a linear or branched C2-C30 alkenyl group, a cycloalkyl group with 5 to 9 carbon atoms, a C6-C30 aryl group, or a C6-C30 arylalkyl group. The particulate solids can be suspended in liquid, water-containing surfactant compositions in a stable manner. The invention also relates to liquid detergent or cleaning agents containing (i) a liquid phase, which contains at least one surfactant and water, and (ii) solid particles, which are suspended in the liquid phase, and to the use of the particulate solids and a liquid phase, which contains water and surfactant, for producing a liquid detergent or cleaning agent.