Nonaqueous Ink Composition for Fast Drying Without Solvent Permeation

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Solution Overview

Problem

Nonaqueous ink compositions containing five-membered ring lactone solvents permeate into resin substrates, leading to solvent retention, film lifting, deterioration of pressure-sensitive adhesive layers, and blushing during stretching, which affects the post-processability and adhesion properties of recorded products.

Innovation Solution

A nonaqueous ink composition comprising specific organic solvents, including dialkyl glycol ethers and resins with defined molecular weights, along with controlled impurity levels, to enhance drying and prevent solvent permeation and blushing, ensuring good post-processability and adhesion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If five-membered ring lactone solvent is used in nonaqueous ink composition, then drying ability during recording is improved, but solvent permeation into substrate increases causing residual solvent and film lifting

Engineering Contradiction:

Improvedrying speedVSAvoidsolvent permeation and residual solvent

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical structure parameter of the lactone solvent from five-membered ring to six-membered ring (ε-caprolactone), which fundamentally alters the solvent's permeation properties while maintaining acceptable drying performance. This structural parameter change resolves the contradiction by reducing harmful permeation without sacrificing drying speed.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite solvent system combining ε-caprolactone (six-membered ring lactone) with other organic solvents and binder resins. This composite approach balances the drying ability provided by the lactone solvent with the reduced permeation characteristics of the overall formulation, preventing residual solvent issues while maintaining recording performance.

Inventive Principle:

Principle #40Composite materials

2Speed

If five-membered ring lactone solvent permeates into resin substrate, then initial drying ability is improved, but adhesion properties of pressure-sensitive adhesive layer deteriorate

Engineering Contradiction:

Improvedrying speedVSAvoidadhesion properties

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent changes the solvent structure from five-membered to six-membered ring lactone (ε-caprolactone), which has different interaction properties with the pressure-sensitive adhesive layer. This parameter change reduces solvent permeation into the adhesive layer, thereby maintaining adhesion properties while still providing adequate drying speed.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces binder resins as intermediary substances that mediate between the solvent and the substrate/adhesive layer. These resins help control solvent release and interaction, protecting the adhesion properties of the pressure-sensitive adhesive layer from deterioration caused by solvent permeation.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Speed

If five-membered ring lactone solvent is used, then drying performance is improved, but blushing occurs during stretching of recorded product

Engineering Contradiction:

Improvedrying performanceVSAvoidcolor stability during stretching

Core Design Contradiction:

SpeedVSStability of the object's composition

Solution Approach 1:

The patent changes the lactone solvent structure to six-membered ring (ε-caprolactone), which has different volatility and interaction characteristics. This parameter change prevents blushing during stretching while maintaining good drying performance, as the six-membered ring structure provides more stable film formation without excessive solvent retention that causes blushing.

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 ink composition achieves rapid drying with improved post-processability on various substrates, including resin, metal, and glass, while maintaining adhesion properties and preventing blushing during stretching.

Implementation Method 1

the nonaqueous ink composition has a high ability to dry during recording

Methodology Applied

Scientific EffectEvaporation: Evaporation

Implementation Method 2

the solvent in the nonaqueous ink composition tends to remain in the substrate even after the nonaqueous ink composition is allowed to dry sufficiently

Methodology Applied

Scientific EffectPermeation resistance: Permeation

Data Source

PatentEP4700094A2Nonaqueous ink composition, and recording method and recorded matter manufacturing method using same

Publication Date: 2026.02.25 DNP FINE CHEMICALS CO LTD

AI summary

Provided is a nonaqueous ink composition which has fine record drying characteristics when being disposed on the surface of a substrate and from which a recorded matter having excellent post-processability is obtained. The nonaqueous ink composition contains organic solvents. The organic solvents include an organic solvent (b). Organic solvent (b): At least one selected from the group consisting of alkylamide-based solvents (b1), and cyclic amide-based solvents (b2).