Solid-Layered Bleach Composition Preventing Residue and Malodor
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Solution Overview
Problem
Existing solid bleach compositions face issues such as residue formation, malodor generation, and slow bleach release, particularly with calcium hypochlorite and chlorinated hydantoins, limiting their effectiveness and consumer preference.
Innovation Solution
A solid-layered bleach composition comprising two parts: the first part includes calcium hypochlorite, a builder, water-soluble polymer, and acid, while the second part contains a surfactant and builder, without oxidants, designed to prevent residue formation and malodor, and enhance bleach release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If calcium hypochlorite is used in solid bleach compositions, then cost-effectiveness and bleaching effectiveness are improved, but residue formation occurs
Solution Approach 1:
The bleach composition is divided into multiple solid layers, with calcium hypochlorite confined to specific layers (e.g., first and third layers) separated from surfactant-containing layers (e.g., second layer). This physical segmentation prevents calcium hypochlorite from contacting surfaces directly, eliminating residue formation while preserving its cost-effective bleaching properties.
2Stability of the object's composition
If chlorinated hydantoins or isocyanurates are used, then long-term solution stability is improved, but malodor generation occurs
Solution Approach 1:
The patent extracts the malodor-generating components (chlorinated hydantoins and isocyanurates) from the formulation and replaces them with calcium hypochlorite in a multi-layer solid structure. The calcium hypochlorite is contained within sealed layers, preventing volatile malodor compounds from escaping while maintaining solution stability through the solid matrix.
3Ease of operation
If traditional solid bleach compositions are used, then ease of use is improved, but bleach release speed is slow
Solution Approach 1:
The solid layered composition incorporates water-soluble polymers and builders that dynamically control bleach release. When water contacts the layers, the polymers hydrate and facilitate controlled dissolution of calcium hypochlorite, accelerating bleach release while maintaining ease of use by simply requiring water contact without complex activation steps.
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 effectively prevents residue formation, reduces malodor, and releases bleach faster than traditional products, providing improved cleaning and disinfecting performance without the drawbacks of previous formulations.
Implementation Method 1
The first part comprises calcium hypochlorite, a builder, water-soluble polymer, and acid. The acid reacts with calcium hypochlorite to release hypochlorous acid (bleach) for cleaning and disinfecting.
Implementation Method 2
The composition includes water-soluble polymer (0.1%-60%) and water-swellable polymer that control the dissolution rate of calcium hypochlorite and prevent residue formation through solvation and swelling mechanisms.
Implementation Method 3
The water-swellable polymer absorbs water and swells, controlling the release rate of bleach and preventing rapid dissolution that would cause residue formation.
Implementation Method 4
The second part comprises surfactant (0.01%-25%) that reduces surface tension to enhance wetting and cleaning performance on surfaces, working synergistically with the released bleach.
Data Source
AI summary
The present invention provides a method of using a solid-layered composition having at least two parts. The first past comprises a) calcium hypochlorite, magnesium hypochlorite and mixtures thereof, b) a builder, c) a water-soluble polymer, d) an acid, and e) wherein the first part does not contain sodium hypochlorite, lithium hypochlorite, potassium hypochlorite and mixtures thereof. The second part comprises a) a surfactant, b) a builder, c) an acid, and d) wherein the second part does not contain any oxidant.