Coated Detergent Particles Resolving Staining Contradictions
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Solution Overview
Problem
Colored solid laundry detergent products often cause unacceptable staining due to the use of pigments, which are practically insoluble in aqueous mediums containing surfactants.
Innovation Solution
Development of large coated laundry detergent particles with a surfactant core and inorganic salt coating, containing organic or inorganic pigments, where the pigments are insoluble in water, reducing staining by optimizing the particle dimensions and composition to minimize color transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pigments are used to color solid laundry detergent products, then the detergent provides color, but unacceptable colored staining occurs
Solution Approach 1:
The detergent is divided into multiple particles with controlled size distribution (0.5-2mm in one dimension, 2-8mm in other dimensions). This segmentation prevents pigment transfer to fabrics by ensuring particles are small enough not to embed in fibers but large enough to maintain structural integrity and minimize staining.
Solution Approach 2:
The patent applies different properties to different parts of the detergent system. The core contains surfactants and builders for cleaning action, while the coating layer contains pigments bound in a matrix that prevents color transfer. This local differentiation allows color provision without staining, as the pigment is contained within the coating structure rather than freely distributed.
2Object-generated harmful factors
If large particle size is used to reduce staining, then color transfer is minimized, but detergent effectiveness may be reduced
Solution Approach 1:
The patent optimizes particle size parameters within specific ranges (0.5-2mm in one dimension, 2-8mm in others) to balance two opposing requirements: large enough to minimize staining but small enough to maintain detergent effectiveness. The coating thickness and composition are also adjusted as parameters to achieve the optimal balance between color transfer prevention and cleaning performance.
3Ease of manufacture
If pigment concentration is increased to enhance color, then color provision is improved, but staining risk increases
Solution Approach 1:
The patent creates a composite coating material combining pigments with binding agents and other detergent components. This composite structure allows higher pigment concentration for enhanced color while the binding matrix prevents pigment release and staining. The coating acts as a containment vehicle that holds pigments in place during washing.
Data Source
AI summary
The present invention provides lenticular or disc detergent particles comprising surfactant, inorganic salts and pigment, wherein the inorganic salts are present on the detergent particles as a coating and the surfactant and the pigment are present as a core. The particles show reduced staining.