Shading Dye Granule Anti-Transfer Agent
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Solution Overview
Problem
Shading dyes in laundry detergents can cause localized spotting on fabrics due to dye transfer issues.
Innovation Solution
Incorporating an anti-dye transfer agent, such as polyvinylpyrrolidone, into the shading dye granule, along with specific surfactants and binders, to control dye migration and deposition, preventing unwanted spotting while ensuring effective dye deposition on fabrics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If shading dyes are added to laundry detergents to increase whiteness, then fabric whiteness is improved, but localized spotting occurs on fabric
Solution Approach 1:
The patent introduces an anti-dye transfer agent as an intermediary substance between the shading dye and the fabric. This agent prevents direct contact and unwanted transfer of dye to the fabric, thereby eliminating spotting while preserving the whiteness-enhancing function of the shading dye.
Solution Approach 2:
The patent modifies the chemical composition parameters of the detergent granule by incorporating specific anti-dye transfer agents at controlled concentrations. This changes the interaction parameters between dye and fabric, preventing harmful dye transfer while maintaining the optical brightening effect.
2Object-affected harmful factors
If anti-dye transfer agent is incorporated into shading dye granule, then spotting is reduced, but granule composition complexity increases
Solution Approach 1:
The anti-dye transfer agent serves multiple functions simultaneously: it prevents dye transfer to fabric, maintains dye solubility, and contributes to granule stability. This multi-functionality reduces the need for additional separate additives, thereby limiting the increase in composition complexity.
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 use of anti-dye transfer polymers and surfactants in the shading dye granules significantly reduces spotting on fabrics, allowing for uniform dye deposition and improved washing performance.
Implementation Method 1
an anti-dye transfer agent present in the shading dye granule
Implementation Method 2
from 0 to 80 wt% of a non-ionic surfactant; from 0 to 20 wt % of an anionic or cationic surfactant
Data Source
AI summary
The present invention provides a granular laundry detergent composition comprising a shading dye granule, comprising a shading dye, a dye transfer polymer and optional ingredients. Said granular laundry detergent composition further comprises 10 to 50 wt % of an anionic surfactant.