Manganese Bleach Catalyst Granules Coating Stability

Solution Overview

Problem

Existing manganese bleach catalyst granules face challenges with storage stability and high loss/recycle of the bleach catalyst during production in automatic dish-washers.

Innovation Solution

The development of granules comprising a manganese bleach catalyst with improved storage stability, achieved by applying a core surrounded by a first coating of bleach catalyst particles and a binder, followed by a second coating of at least 60% water-soluble salt, and a third coating, ensuring a specific particle size distribution and coating thickness ratio.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If manganese bleach catalyst particles are used in granular detergents, then bleach effect is improved, but storage stability deteriorates and loss/recycle during production increases

Engineering Contradiction:

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The granule is divided into multiple functional layers: a core, a first coating containing the manganese bleach catalyst particles, a second coating providing protection, and a third outer coating. This segmentation isolates the catalyst particles within the first coating, protecting them from degradation while maintaining their bleach effect, thereby improving storage stability and reducing loss during production

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The first coating acts as an intermediary layer that contains and protects the manganese bleach catalyst particles. This coating mediates between the catalyst particles and the external environment, preventing direct exposure to conditions that would cause degradation or loss, thus improving both storage stability and reducing production loss

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If bleach catalyst particles are applied in production, then bleach functionality is achieved, but loss/recycle of catalyst occurs

Engineering Contradiction:

Core Design Contradiction:

ProductivityVSLoss of substance

Solution Approach 1:

The manganese bleach catalyst particles are merged with a binder to form the first coating layer on the granule. This combination ensures the catalyst particles are firmly attached to the granule structure, preventing loss during production while maintaining the required bleach functionality and detergent performance

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The granule is constructed as a composite material system with multiple coatings, where the first coating combines manganese bleach catalyst particles with a binder. This composite structure provides both the necessary bleach functionality and prevents catalyst loss during production, achieving high productivity without substance loss

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS20250027013A1Manganese Bleach Catalyst Granules

Publication Date: 2025.01.23

AI summary

The present invention relates to granules comprising a bleach catalyst and to their use in bleach-containing detergents.