Bleach Catalyst Granules with Polycarboxylate Binder

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Solution Overview

Problem

Bleach catalyst granules used in dishwasher detergents at low washing temperatures and short wash cycles fail to dissolve quickly, leading to inadequate cleaning performance, and granules containing triazacyclonane rings can develop an unpleasant amine odor during storage, making them unsuitable for commercial use.

Innovation Solution

Development of bleach catalyst granules comprising di- or trimethyltriazacyclonanes with a homo- or copolymeric polycarboxylate binder, produced through an anhydrous granulating process at temperatures below 100°C, ensuring chemical stability, odorlessness, and rapid dissolution at temperatures below 50°C.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If conventional binders (fatty acids, soaps, silicone oils, waxes) are used in bleach catalyst granules, then storage stability is improved, but dissolution speed at low washing temperatures deteriorates

Engineering Contradiction:

Improvestorage stabilityVSAvoiddissolution speed

Core Design Contradiction:

Stability of the object's compositionVSSpeed

Solution Approach 1:

The patent changes the chemical composition parameters of the binder by using polyethylene glycol with specific molecular weights (200-10,000) instead of conventional binders. This parameter change enables the binder to maintain stability during storage while dissolving rapidly at low washing temperatures (below 50°C), thus resolving the contradiction between storage stability and dissolution speed.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If triazacyclonane ring compounds are used in bleach catalyst granules, then cleaning efficacy is improved, but odor development during storage worsens

Engineering Contradiction:

Improvecleaning efficacyVSAvoidamine odor

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent creates a composite material system combining the bleach catalyst (manganese complex with triazacyclonane ligand) with polyethylene glycol binder and optionally organic acids. This composite structure maintains the high cleaning efficacy of the triazacyclonane compound while the polyethylene glycol matrix prevents odor development during storage, thus resolving the contradiction between cleaning efficacy and odor control.

Inventive Principle:

Principle #40Composite materials

3Productivity

If granules are designed for rapid dissolution at low temperatures, then cleaning performance is improved, but storage stability deteriorates

Engineering Contradiction:

Improvecleaning performanceVSAvoidstorage stability

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The patent optimizes the molecular weight parameters of polyethylene glycol (200-10,000) to achieve a balance between storage stability and rapid dissolution. The specific molecular weight range enables the granules to remain stable during storage while dissolving quickly at low washing temperatures to deliver superior cleaning performance, thus resolving the contradiction between productivity and stability.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9902921B2Bleach catalyst granules, use thereof and washing cleaning agents containing the same

Publication Date: 2018.02.27 WEYLCHEM WIESBADEN GMBH

AI summary

The invention relates to a bleach catalyst granules containing a metal-containing bleach catalyst, which comprises at least one ligand selected from the group comprising di- or trimethyltriazcyclononanes or derivatives therefrom, and a homo- or copolymer polycarboxylate, salts thereof or partially neutralized having a pH-value of between 3 and 9. Said granules are produced in an anhydrous granulation process, in particular by compacting, the treatment temperature being maintained at below 100° C.