Surface-Modified Metal Oxide Particles for Uniform Coating

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Solution Overview

Problem

Existing methods for surface modification of metal oxide submicron particles often result in uneven surface coverage, require high temperatures, and generate significant amounts of volatile organic compounds (VOCs) and toxic byproducts, posing environmental and safety concerns.

Innovation Solution

The development of surface-modified particles comprising a core of oxidic material coated with a layer obtained from treating the core with a silicon compound and a silane, using building blocks according to specific formulas to enhance dispersibility and reduce environmental impact.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If monomeric silanes are used for surface functionalization, then surface coverage is improved, but the process requires high temperatures and generates significant VOCs

Engineering Contradiction:

Improvesurface coverage uniformityVSAvoidVOC emissions

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The patent changes the chemical parameters of the silane compounds by using polymeric silane structures instead of monomeric silanes, and by introducing specific functional groups (carboxylic acid, hydroxyl, alkoxy) that enable surface modification at lower temperatures, thereby reducing VOC emissions while maintaining surface coverage quality

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite silane structures combining multiple functional groups and polymeric chains to achieve both uniform surface coverage and reduced VOC generation, creating a hybrid material that integrates the benefits of both monomeric and polymeric silane approaches

Inventive Principle:

Principle #40Composite materials

2Manufacturing precision

If hydrosiloxanes are used for surface modification, then surface functionalization is achieved, but severe safety measures and inert conditions are required

Engineering Contradiction:

Improvesurface functionalizationVSAvoidsafety requirements

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent modifies the chemical parameters of the silane compounds by using compounds that do not require inert atmospheres or special safety measures, while still achieving effective surface functionalization through controlled hydrolysis and condensation reactions under normal conditions

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If alkoxysilanes are used for surface functionalization, then hydrophilicity and molecular adsorption are enhanced, but uneven surface coverage and high energy consumption occur

Engineering Contradiction:

Improvesurface functionalityVSAvoidsurface coverage uniformity

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent uses composite silane structures with multiple functional groups (carboxylic acid, hydroxyl, alkoxy) combined in polymeric chains, which provide both the desired surface functionality and uniform coverage through controlled reaction mechanisms, eliminating the uneven coverage problem of simple alkoxysilanes

Inventive Principle:

Principle #40Composite materials

4Manufacturing precision

If conventional surface modification methods are used, then surface functionalization is achieved, but toxic byproducts and environmental harm are generated

Engineering Contradiction:

Improvesurface functionalizationVSAvoidtoxic byproducts

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The patent converts the potentially harmful VOC emissions and toxic byproducts of conventional silane reactions into beneficial outcomes by using alternative silane compounds that undergo reactions producing non-toxic byproducts, while still achieving effective surface functionalization

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent changes the chemical composition parameters of the silane reagents to use compounds with non-toxic byproducts, fundamentally altering the reaction chemistry to eliminate harmful emissions while maintaining surface modification effectiveness

Inventive Principle:

Principle #35Parameter changes

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 surface-modified particles achieve improved coverage of binding sites, enhanced dispersibility, and reduced environmental footprint, with benefits including increased crosslinking, hydrophobicity, and moisture resistance, while minimizing VOC and toxic compound emissions.

Implementation Method 1

at least one layer obtained from treating said core with at least one silicon compound and at least one silane

Methodology Applied

Scientific EffectChemical bonding: Chemical Bonding

Implementation Method 2

improved coverage of the binding sites of the non-modified particle

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentUS20250138444A1Submicron surface-modified metal oxide particles

Publication Date: 2025.05.01 EVONIK OPERATIONS GMBH

AI summary

A surface-modified particle includes a core containing at least one oxidic material and at least one layer. The layer is obtained from at least one silicon compound and at least one silane according to formula(S). The silicon compound includes at least one building block of formula (A) and at least one building block of formula (B). A method is developed for preparing the surface-modified particle, and another method treats a surface of a substrate with at least one surface-modified particle. The surface-modified particle is added to various formulations, in particular a toner composition.