Coated Detergent Particles for Stain Reduction
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Solution Overview
Problem
Existing laundry detergent particles often cause staining and have limited photostability of dyes, leading to reduced performance and storage issues.
Innovation Solution
Development of coated detergent particles with a surfactant core and inorganic salt coating, featuring specific dimensions and compositions that include calcium-tolerant surfactant blends, reducing the need for builders and enhancing dye stability and photostability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If dyes are added to laundry detergent particles, then the particles provide color enhancement and staining properties, but the dyes cause staining on fabrics and have limited photostability during storage
Solution Approach 1:
The detergent particle is segmented into a core and a coating layer. The dye is incorporated into the core along with surfactant and builder materials, while the coating layer (comprising inorganic salts and binders) acts as a protective barrier. This segmentation isolates the dye from direct contact with fabrics, reducing staining, and protects it from environmental factors, improving photostability during storage.
Solution Approach 2:
The coating layer serves as an intermediary between the dye-containing core and the external environment (fabric and light). This intermediate layer prevents direct interaction between the dye and fabric, reducing staining, while also shielding the dye from UV radiation and other degrading factors, thereby enhancing photostability.
2Reliability
If conventional surfactant blends are used, then the detergent provides basic cleaning performance, but it requires builders that increase particle size and reduce storage stability
Solution Approach 1:
The invention changes the chemical composition parameters of the surfactant blend by incorporating calcium-tolerant surfactants (such as calcium soap-free surfactants and calcium-active nonionic surfactants) in specific proportions (at least 20 wt% of the total surfactant blend). This parameter change allows the formulation to maintain effective detergency in both hard and soft water without requiring traditional builders, thereby improving storage stability and particle composition consistency.
3Object-affected harmful factors
If inorganic salts are used as coating material, then the particles achieve reduced staining and improved flow properties, but the coating process increases manufacturing complexity
Solution Approach 1:
The coating layer is formulated with inorganic salts (such as sodium carbonate, sodium sulphate, and calcium carbonate) that create a porous or microstructured surface. This porous structure reduces staining by preventing dye transfer to fabrics while maintaining particle flow properties. The simplicity of using common inorganic salts as coating materials balances the manufacturing complexity with effective performance.
Data Source
AI summary
The present invention provides lenticular or disc detergent particles comprising (i) surfactat, (ii) inorganic salts, and (iii) dye, wherein the inorganic salts are present on the detergent particle as a coating and the surfactant and the dye are present as a core. The particles show reduced staining.