Oil-Based Inkjet Ink with Polydimethylsiloxane Side Chains

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Solution Overview

Problem

Existing oil-based inkjet inks with high ester-based solvents exhibit high viscosity, leading to suboptimal discharge performance from inkjet nozzles and potential deformation of clear files due to solvent penetration.

Innovation Solution

Incorporating an oil-soluble acrylic-based polymer with a polydimethylsiloxane side chain structure, which reduces ink viscosity while maintaining dispersibility and colorant stability, and using a water-in-oil emulsion method to produce the ink, thereby improving discharge stability and reducing clear file deformation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If high ester-based solvents are used in oil-based inkjet ink, then discharge stability is improved, but viscosity increases leading to suboptimal discharge performance

Engineering Contradiction:

Improvedischarge stabilityVSAvoiddischarge performance

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent changes the chemical structure parameters of the solvent by introducing polydimethylsiloxane structures with specific chain lengths (n=1-10) and molecular weights (500-10,000), which modify the ink's viscosity and discharge characteristics while maintaining stability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite ink formulation combining colorants, the specific polydimethylsiloxane-containing solvent, and optional additives like surfactants or resins, achieving both stability and discharge performance through synergistic material composition

Inventive Principle:

Principle #40Composite materials

2Reliability

If high ester-based solvents are used in oil-based inkjet ink, then discharge stability is improved, but clear file deformation occurs due to solvent penetration

Engineering Contradiction:

Improvedischarge stabilityVSAvoidclear file deformation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent modifies the solvent parameters by using polydimethylsiloxane structures with controlled chain lengths and molecular weights, which reduce solvent penetration into clear files while preserving discharge stability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the potential harm of solvent penetration by selecting solvents with specific polydimethylsiloxane structures that have appropriate balance between stability provision and penetration resistance, turning a harmful effect into a controlled beneficial property

Inventive Principle:

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

3Ease of operation

If viscosity is reduced to improve discharge performance, then discharge performance is improved, but colorant dispersibility may deteriorate

Engineering Contradiction:

Improvedischarge performanceVSAvoidcolorant dispersibility

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The patent formulates a composite ink system where the polydimethylsiloxane-containing solvent works synergistically with colorants and optional additives to maintain both low viscosity for discharge performance and adequate dispersibility for colorant stability

Inventive Principle:

Principle #40Composite materials

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 solution enhances discharge performance and storage stability of the ink, while minimizing clear file deformation by lowering viscosity and maintaining image density and print quality.

Implementation Method 1

an oil-soluble resin that is an acrylic-based polymer having a side chain containing a polydimethylsiloxane structure

Methodology Applied

Scientific EffectPolydimethylsiloxane structure:

Implementation Method 2

producing a water-in-oil emulsion containing a continuous phase containing a non-aqueous solvent and an oil-soluble resin that is an acrylic-based polymer having a side chain containing a polydimethylsiloxane structure, and a dispersed phase containing water, a colorant and a water-dispersible resin

Methodology Applied

Scientific EffectEmulsion: Emulsion

Data Source

PatentUS10920096B2Oil-based inkjet ink and method for producing oil-based inkjet ink

Publication Date: 2021.02.16 RISO KAGAKU CORP

AI summary

An oil-based inkjet ink is disclosed that contains a colorant, an oil-soluble resin that is an acrylic-based polymer having a side chain containing a polydimethylsiloxane structure, and a non-aqueous solvent. A method for producing an oil-based inkjet ink is also disclosed.